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Merge branch 'master' into pylint

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Adrián Chaves 2020-05-06 16:24:13 +02:00 committed by GitHub
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3
.bumpversion.cfg
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@ -1,8 +1,7 @@
[bumpversion]
current_version = 1.8.0
current_version = 2.1.0
commit = True
tag = True
tag_name = {new_version}
[bumpversion:file:scrapy/VERSION]

11
.readthedocs.yml Normal file
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@ -0,0 +1,11 @@
version: 2
sphinx:
configuration: docs/conf.py
fail_on_warning: true
python:
# For available versions, see:
# https://docs.readthedocs.io/en/stable/config-file/v2.html#build-image
version: 3.7 # Keep in sync with .travis.yml
install:
- requirements: docs/requirements.txt
- path: .

22
.travis.yml
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@ -13,21 +13,23 @@ matrix:
python: 3.8
- env: TOXENV=pylint
python: 3.8
- env: TOXENV=docs
python: 3.7 # Keep in sync with .readthedocs.yml
- env: TOXENV=pypy3
- env: TOXENV=py35
python: 3.5
- python: 3.5
- env: TOXENV=pinned
python: 3.5
- env: TOXENV=py36
python: 3.6
- env: TOXENV=py37
python: 3.7
- env: TOXENV=py38
- env: TOXENV=asyncio
python: 3.5.2
- python: 3.6
- python: 3.7
- env: PYPI_RELEASE_JOB=true
python: 3.8
- env: TOXENV=extra-deps
python: 3.8
- env: TOXENV=docs
python: 3.6
- env: TOXENV=asyncio
python: 3.8
install:
- |
if [ "$TOXENV" = "pypy3" ]; then
@ -60,4 +62,4 @@ deploy:
on:
tags: true
repo: scrapy/scrapy
condition: "$TOXENV == py37 && $TRAVIS_TAG =~ ^[0-9]+[.][0-9]+[.][0-9]+(rc[0-9]+|[.]dev[0-9]+)?$"
condition: "$PYPI_RELEASE_JOB == true && $TRAVIS_TAG =~ ^[0-9]+[.][0-9]+[.][0-9]+(rc[0-9]+|[.]dev[0-9]+)?$"

24
Makefile.buildbot
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@ -1,24 +0,0 @@
TRIAL := $(shell which trial)
BRANCH := $(shell git rev-parse --abbrev-ref HEAD)
export PYTHONPATH=$(PWD)
test:
coverage run --branch $(TRIAL) --reporter=text tests
rm -rf htmlcov && coverage html
-s3cmd sync -P htmlcov/ s3://static.scrapy.org/coverage-scrapy-$(BRANCH)/
build:
git describe --tags --match '[0-9]*' |sed 's/-/.post/;s/-g/+g/' >scrapy/VERSION
debchange -m -D unstable --force-distribution -v \
$$(python setup.py --version |sed -r 's/([0-9]+.[0-9]+.[0-9]+)(a|b|rc|dev)([0-9]*)/\1~\2\3/')-$$(date +%s) \
"Automatic build"
debuild -us -uc -b
clean:
git checkout debian scrapy/VERSION
git clean -dfq
pypi:
umask 0022 && chmod -R a+rX . && python setup.py sdist upload
.PHONY: clean test build

2
README.rst
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@ -41,7 +41,7 @@ Requirements
============
* Python 3.5+
* Works on Linux, Windows, Mac OSX, BSD
* Works on Linux, Windows, macOS, BSD
Install
=======

3
artwork/README.rst
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@ -1,5 +1,4 @@
:orphan:
==============
Scrapy artwork
==============

21
conftest.py
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@ -11,7 +11,11 @@ collect_ignore = [
# not a test, but looks like a test
"scrapy/utils/testsite.py",
# contains scripts to be run by tests/test_crawler.py::CrawlerProcessSubprocess
*_py_files("tests/CrawlerProcess")
*_py_files("tests/CrawlerProcess"),
# contains scripts to be run by tests/test_crawler.py::CrawlerRunnerSubprocess
*_py_files("tests/CrawlerRunner"),
# Py36-only parts of respective tests
*_py_files("tests/py36"),
]
for line in open('tests/ignores.txt'):
@ -34,3 +38,18 @@ def pytest_collection_modifyitems(session, config, items):
items[:] = [item for item in items if isinstance(item, Flake8Item)]
except ImportError:
pass
@pytest.fixture(scope='class')
def reactor_pytest(request):
if not request.cls:
# doctests
return
request.cls.reactor_pytest = request.config.getoption("--reactor")
return request.cls.reactor_pytest
@pytest.fixture(autouse=True)
def only_asyncio(request, reactor_pytest):
if request.node.get_closest_marker('only_asyncio') and reactor_pytest != 'asyncio':
pytest.skip('This test is only run with --reactor=asyncio')

5
debian/changelog vendored
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@ -1,5 +0,0 @@
scrapy (0.11) unstable; urgency=low
* Initial release.
-- Scrapinghub Team <info@scrapinghub.com> Thu, 10 Jun 2010 17:24:02 -0300

1
debian/compat vendored
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@ -1 +0,0 @@
7

20
debian/control vendored
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@ -1,20 +0,0 @@
Source: scrapy
Section: python
Priority: optional
Maintainer: Scrapinghub Team <info@scrapinghub.com>
Build-Depends: debhelper (>= 7.0.50), python (>=2.7), python-twisted, python-w3lib, python-lxml, python-six (>=1.5.2)
Standards-Version: 3.8.4
Homepage: https://scrapy.org/
Package: scrapy
Architecture: all
Depends: ${python:Depends}, python-lxml, python-twisted, python-openssl,
python-w3lib (>= 1.8.0), python-queuelib, python-cssselect (>= 0.9), python-six (>=1.5.2)
Recommends: python-setuptools
Conflicts: python-scrapy, scrapy-0.25
Provides: python-scrapy, scrapy-0.25
Description: Python web crawling and web scraping framework
Scrapy is a fast high-level web crawling and web scraping framework,
used to crawl websites and extract structured data from their pages.
It can be used for a wide range of purposes, from data mining to
monitoring and automated testing.

40
debian/copyright vendored
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@ -1,40 +0,0 @@
This package was debianized by the Scrapinghub team <info@scrapinghub.com>.
It was downloaded from https://scrapy.org
Upstream Author: Scrapy Developers
Copyright: 2007-2013 Scrapy Developers
License: bsd
Copyright (c) Scrapy developers.
All rights reserved.
Redistribution and use in source and binary forms, with or without modification,
are permitted provided that the following conditions are met:
1. Redistributions of source code must retain the above copyright notice,
this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
3. Neither the name of Scrapy nor the names of its contributors may be used
to endorse or promote products derived from this software without
specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
The Debian packaging is (C) 2010-2013, Scrapinghub <info@scrapinghub.com> and
is licensed under the BSD, see `/usr/share/common-licenses/BSD'.

1
debian/pyversions vendored
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@ -1 +0,0 @@
2.7

5
debian/rules vendored
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@ -1,5 +0,0 @@
#!/usr/bin/make -f
# -*- makefile -*-
%:
dh $@

2
debian/scrapy.docs vendored
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@ -1,2 +0,0 @@
README.rst
AUTHORS

2
debian/scrapy.install vendored
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@ -1,2 +0,0 @@
extras/scrapy_bash_completion etc/bash_completion.d/
extras/scrapy_zsh_completion /usr/share/zsh/vendor-completions/_scrapy

1
debian/scrapy.lintian-overrides vendored
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@ -1 +0,0 @@
new-package-should-close-itp-bug

1
debian/scrapy.manpages vendored
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@ -1 +0,0 @@
extras/scrapy.1

281
docs/_tests/quotes.html Normal file
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@ -0,0 +1,281 @@
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Quotes to Scrape</title>
<link rel="stylesheet" href="/static/bootstrap.min.css">
<link rel="stylesheet" href="/static/main.css">
</head>
<body>
<div class="container">
<div class="row header-box">
<div class="col-md-8">
<h1>
<a href="/" style="text-decoration: none">Quotes to Scrape</a>
</h1>
</div>
<div class="col-md-4">
<p>
<a href="/login">Login</a>
</p>
</div>
</div>
<div class="row">
<div class="col-md-8">
<div class="quote" itemscope itemtype="http://schema.org/CreativeWork">
<span class="text" itemprop="text">“The world as we have created it is a process of our thinking. It cannot be changed without changing our thinking.”</span>
<span>by <small class="author" itemprop="author">Albert Einstein</small>
<a href="/author/Albert-Einstein">(about)</a>
</span>
<div class="tags">
Tags:
<meta class="keywords" itemprop="keywords" content="change,deep-thoughts,thinking,world" / >
<a class="tag" href="/tag/change/page/1/">change</a>
<a class="tag" href="/tag/deep-thoughts/page/1/">deep-thoughts</a>
<a class="tag" href="/tag/thinking/page/1/">thinking</a>
<a class="tag" href="/tag/world/page/1/">world</a>
</div>
</div>
<div class="quote" itemscope itemtype="http://schema.org/CreativeWork">
<span class="text" itemprop="text">“It is our choices, Harry, that show what we truly are, far more than our abilities.”</span>
<span>by <small class="author" itemprop="author">J.K. Rowling</small>
<a href="/author/J-K-Rowling">(about)</a>
</span>
<div class="tags">
Tags:
<meta class="keywords" itemprop="keywords" content="abilities,choices" / >
<a class="tag" href="/tag/abilities/page/1/">abilities</a>
<a class="tag" href="/tag/choices/page/1/">choices</a>
</div>
</div>
<div class="quote" itemscope itemtype="http://schema.org/CreativeWork">
<span class="text" itemprop="text">“There are only two ways to live your life. One is as though nothing is a miracle. The other is as though everything is a miracle.”</span>
<span>by <small class="author" itemprop="author">Albert Einstein</small>
<a href="/author/Albert-Einstein">(about)</a>
</span>
<div class="tags">
Tags:
<meta class="keywords" itemprop="keywords" content="inspirational,life,live,miracle,miracles" / >
<a class="tag" href="/tag/inspirational/page/1/">inspirational</a>
<a class="tag" href="/tag/life/page/1/">life</a>
<a class="tag" href="/tag/live/page/1/">live</a>
<a class="tag" href="/tag/miracle/page/1/">miracle</a>
<a class="tag" href="/tag/miracles/page/1/">miracles</a>
</div>
</div>
<div class="quote" itemscope itemtype="http://schema.org/CreativeWork">
<span class="text" itemprop="text">“The person, be it gentleman or lady, who has not pleasure in a good novel, must be intolerably stupid.”</span>
<span>by <small class="author" itemprop="author">Jane Austen</small>
<a href="/author/Jane-Austen">(about)</a>
</span>
<div class="tags">
Tags:
<meta class="keywords" itemprop="keywords" content="aliteracy,books,classic,humor" / >
<a class="tag" href="/tag/aliteracy/page/1/">aliteracy</a>
<a class="tag" href="/tag/books/page/1/">books</a>
<a class="tag" href="/tag/classic/page/1/">classic</a>
<a class="tag" href="/tag/humor/page/1/">humor</a>
</div>
</div>
<div class="quote" itemscope itemtype="http://schema.org/CreativeWork">
<span class="text" itemprop="text">“Imperfection is beauty, madness is genius and it&#39;s better to be absolutely ridiculous than absolutely boring.”</span>
<span>by <small class="author" itemprop="author">Marilyn Monroe</small>
<a href="/author/Marilyn-Monroe">(about)</a>
</span>
<div class="tags">
Tags:
<meta class="keywords" itemprop="keywords" content="be-yourself,inspirational" / >
<a class="tag" href="/tag/be-yourself/page/1/">be-yourself</a>
<a class="tag" href="/tag/inspirational/page/1/">inspirational</a>
</div>
</div>
<div class="quote" itemscope itemtype="http://schema.org/CreativeWork">
<span class="text" itemprop="text">“Try not to become a man of success. Rather become a man of value.”</span>
<span>by <small class="author" itemprop="author">Albert Einstein</small>
<a href="/author/Albert-Einstein">(about)</a>
</span>
<div class="tags">
Tags:
<meta class="keywords" itemprop="keywords" content="adulthood,success,value" / >
<a class="tag" href="/tag/adulthood/page/1/">adulthood</a>
<a class="tag" href="/tag/success/page/1/">success</a>
<a class="tag" href="/tag/value/page/1/">value</a>
</div>
</div>
<div class="quote" itemscope itemtype="http://schema.org/CreativeWork">
<span class="text" itemprop="text">“It is better to be hated for what you are than to be loved for what you are not.”</span>
<span>by <small class="author" itemprop="author">André Gide</small>
<a href="/author/Andre-Gide">(about)</a>
</span>
<div class="tags">
Tags:
<meta class="keywords" itemprop="keywords" content="life,love" / >
<a class="tag" href="/tag/life/page/1/">life</a>
<a class="tag" href="/tag/love/page/1/">love</a>
</div>
</div>
<div class="quote" itemscope itemtype="http://schema.org/CreativeWork">
<span class="text" itemprop="text">“I have not failed. I&#39;ve just found 10,000 ways that won&#39;t work.”</span>
<span>by <small class="author" itemprop="author">Thomas A. Edison</small>
<a href="/author/Thomas-A-Edison">(about)</a>
</span>
<div class="tags">
Tags:
<meta class="keywords" itemprop="keywords" content="edison,failure,inspirational,paraphrased" / >
<a class="tag" href="/tag/edison/page/1/">edison</a>
<a class="tag" href="/tag/failure/page/1/">failure</a>
<a class="tag" href="/tag/inspirational/page/1/">inspirational</a>
<a class="tag" href="/tag/paraphrased/page/1/">paraphrased</a>
</div>
</div>
<div class="quote" itemscope itemtype="http://schema.org/CreativeWork">
<span class="text" itemprop="text">“A woman is like a tea bag; you never know how strong it is until it&#39;s in hot water.”</span>
<span>by <small class="author" itemprop="author">Eleanor Roosevelt</small>
<a href="/author/Eleanor-Roosevelt">(about)</a>
</span>
<div class="tags">
Tags:
<meta class="keywords" itemprop="keywords" content="misattributed-eleanor-roosevelt" / >
<a class="tag" href="/tag/misattributed-eleanor-roosevelt/page/1/">misattributed-eleanor-roosevelt</a>
</div>
</div>
<div class="quote" itemscope itemtype="http://schema.org/CreativeWork">
<span class="text" itemprop="text">“A day without sunshine is like, you know, night.”</span>
<span>by <small class="author" itemprop="author">Steve Martin</small>
<a href="/author/Steve-Martin">(about)</a>
</span>
<div class="tags">
Tags:
<meta class="keywords" itemprop="keywords" content="humor,obvious,simile" / >
<a class="tag" href="/tag/humor/page/1/">humor</a>
<a class="tag" href="/tag/obvious/page/1/">obvious</a>
<a class="tag" href="/tag/simile/page/1/">simile</a>
</div>
</div>
<nav>
<ul class="pager">
<li class="next">
<a href="/page/2/">Next <span aria-hidden="true">&rarr;</span></a>
</li>
</ul>
</nav>
</div>
<div class="col-md-4 tags-box">
<h2>Top Ten tags</h2>
<span class="tag-item">
<a class="tag" style="font-size: 28px" href="/tag/love/">love</a>
</span>
<span class="tag-item">
<a class="tag" style="font-size: 26px" href="/tag/inspirational/">inspirational</a>
</span>
<span class="tag-item">
<a class="tag" style="font-size: 26px" href="/tag/life/">life</a>
</span>
<span class="tag-item">
<a class="tag" style="font-size: 24px" href="/tag/humor/">humor</a>
</span>
<span class="tag-item">
<a class="tag" style="font-size: 22px" href="/tag/books/">books</a>
</span>
<span class="tag-item">
<a class="tag" style="font-size: 14px" href="/tag/reading/">reading</a>
</span>
<span class="tag-item">
<a class="tag" style="font-size: 10px" href="/tag/friendship/">friendship</a>
</span>
<span class="tag-item">
<a class="tag" style="font-size: 8px" href="/tag/friends/">friends</a>
</span>
<span class="tag-item">
<a class="tag" style="font-size: 8px" href="/tag/truth/">truth</a>
</span>
<span class="tag-item">
<a class="tag" style="font-size: 6px" href="/tag/simile/">simile</a>
</span>
</div>
</div>
</div>
<footer class="footer">
<div class="container">
<p class="text-muted">
Quotes by: <a href="https://www.goodreads.com/quotes">GoodReads.com</a>
</p>
<p class="copyright">
Made with <span class='sh-red'>❤</span> by <a href="https://scrapinghub.com">Scrapinghub</a>
</p>
</div>
</footer>
</body>
</html>

13
docs/conf.py
View File

@ -269,6 +269,10 @@ coverage_ignore_pyobjects = [
# Never documented before, and deprecated now.
r'^scrapy\.item\.DictItem$',
r'^scrapy\.linkextractors\.FilteringLinkExtractor$',
# Implementation detail of LxmlLinkExtractor
r'^scrapy\.linkextractors\.lxmlhtml\.LxmlParserLinkExtractor',
]
@ -277,11 +281,13 @@ coverage_ignore_pyobjects = [
intersphinx_mapping = {
'coverage': ('https://coverage.readthedocs.io/en/stable', None),
'cssselect': ('https://cssselect.readthedocs.io/en/latest', None),
'pytest': ('https://docs.pytest.org/en/latest', None),
'python': ('https://docs.python.org/3', None),
'sphinx': ('https://www.sphinx-doc.org/en/master', None),
'tox': ('https://tox.readthedocs.io/en/latest', None),
'twisted': ('https://twistedmatrix.com/documents/current', None),
'twistedapi': ('https://twistedmatrix.com/documents/current/api', None),
}
@ -289,3 +295,10 @@ intersphinx_mapping = {
# ------------------------------------
hoverxref_auto_ref = True
hoverxref_role_types = {
"class": "tooltip",
"confval": "tooltip",
"hoverxref": "tooltip",
"mod": "tooltip",
"ref": "tooltip",
}

10
docs/contributing.rst
View File

@ -44,7 +44,7 @@ guidelines when you're going to report a new bug.
* check the :ref:`FAQ <faq>` first to see if your issue is addressed in a
well-known question
* if you have a general question about scrapy usage, please ask it at
* if you have a general question about Scrapy usage, please ask it at
`Stack Overflow <https://stackoverflow.com/questions/tagged/scrapy>`__
(use "scrapy" tag).
@ -143,7 +143,7 @@ by running ``git fetch upstream pull/$PR_NUMBER/head:$BRANCH_NAME_TO_CREATE``
(replace 'upstream' with a remote name for scrapy repository,
``$PR_NUMBER`` with an ID of the pull request, and ``$BRANCH_NAME_TO_CREATE``
with a name of the branch you want to create locally).
See also: https://help.github.com/articles/checking-out-pull-requests-locally/#modifying-an-inactive-pull-request-locally.
See also: https://help.github.com/en/github/collaborating-with-issues-and-pull-requests/checking-out-pull-requests-locally#modifying-an-inactive-pull-request-locally.
When writing GitHub pull requests, try to keep titles short but descriptive.
E.g. For bug #411: "Scrapy hangs if an exception raises in start_requests"
@ -168,7 +168,7 @@ Scrapy:
* Don't put your name in the code you contribute; git provides enough
metadata to identify author of the code.
See https://help.github.com/articles/setting-your-username-in-git/ for
See https://help.github.com/en/github/using-git/setting-your-username-in-git for
setup instructions.
.. _documentation-policies:
@ -217,7 +217,7 @@ the tests with Python 3.6 use::
tox -e py36
You can also specify a comma-separated list of environmets, and use :ref:`tox’s
You can also specify a comma-separated list of environments, and use :ref:`tox’s
parallel mode <tox:parallel_mode>` to run the tests on multiple environments in
parallel::
@ -266,5 +266,5 @@ And their unit-tests are in::
.. _tests/: https://github.com/scrapy/scrapy/tree/master/tests
.. _open issues: https://github.com/scrapy/scrapy/issues
.. _PEP 257: https://www.python.org/dev/peps/pep-0257/
.. _pull request: https://help.github.com/en/articles/creating-a-pull-request
.. _pull request: https://help.github.com/en/github/collaborating-with-issues-and-pull-requests/creating-a-pull-request
.. _pytest-xdist: https://github.com/pytest-dev/pytest-xdist

28
docs/faq.rst
View File

@ -22,8 +22,8 @@ In other words, comparing `BeautifulSoup`_ (or `lxml`_) to Scrapy is like
comparing `jinja2`_ to `Django`_.
.. _BeautifulSoup: https://www.crummy.com/software/BeautifulSoup/
.. _lxml: http://lxml.de/
.. _jinja2: http://jinja.pocoo.org/
.. _lxml: https://lxml.de/
.. _jinja2: https://palletsprojects.com/p/jinja/
.. _Django: https://www.djangoproject.com/
Can I use Scrapy with BeautifulSoup?
@ -140,7 +140,7 @@ setting the following settings::
While pending requests are below the configured values of
:setting:`CONCURRENT_REQUESTS`, :setting:`CONCURRENT_REQUESTS_PER_DOMAIN` or
:setting:`CONCURRENT_REQUESTS_PER_DOMAIN`, those requests are sent
:setting:`CONCURRENT_REQUESTS_PER_IP`, those requests are sent
concurrently. As a result, the first few requests of a crawl rarely follow the
desired order. Lowering those settings to ``1`` enforces the desired order, but
it significantly slows down the crawl as a whole.
@ -269,7 +269,7 @@ The ``__VIEWSTATE`` parameter is used in sites built with ASP.NET/VB.NET. For
more info on how it works see `this page`_. Also, here's an `example spider`_
which scrapes one of these sites.
.. _this page: http://search.cpan.org/~ecarroll/HTML-TreeBuilderX-ASP_NET-0.09/lib/HTML/TreeBuilderX/ASP_NET.pm
.. _this page: https://metacpan.org/pod/release/ECARROLL/HTML-TreeBuilderX-ASP_NET-0.09/lib/HTML/TreeBuilderX/ASP_NET.pm
.. _example spider: https://github.com/AmbientLighter/rpn-fas/blob/master/fas/spiders/rnp.py
What's the best way to parse big XML/CSV data feeds?
@ -338,7 +338,7 @@ How to split an item into multiple items in an item pipeline?
input item. :ref:`Create a spider middleware <custom-spider-middleware>`
instead, and use its
:meth:`~scrapy.spidermiddlewares.SpiderMiddleware.process_spider_output`
method for this puspose. For example::
method for this purpose. For example::
from copy import deepcopy
@ -353,7 +353,25 @@ method for this puspose. For example::
for _ in range(item['multiply_by']):
yield deepcopy(item)
Does Scrapy support IPv6 addresses?
-----------------------------------
Yes, by setting :setting:`DNS_RESOLVER` to ``scrapy.resolver.CachingHostnameResolver``.
Note that by doing so, you lose the ability to set a specific timeout for DNS requests
(the value of the :setting:`DNS_TIMEOUT` setting is ignored).
.. _faq-specific-reactor:
How to deal with ``<class 'ValueError'>: filedescriptor out of range in select()`` exceptions?
----------------------------------------------------------------------------------------------
This issue `has been reported`_ to appear when running broad crawls in macOS, where the default
Twisted reactor is :class:`twisted.internet.selectreactor.SelectReactor`. Switching to a
different reactor is possible by using the :setting:`TWISTED_REACTOR` setting.
.. _has been reported: https://github.com/scrapy/scrapy/issues/2905
.. _user agents: https://en.wikipedia.org/wiki/User_agent
.. _LIFO: https://en.wikipedia.org/wiki/Stack_(abstract_data_type)
.. _DFO order: https://en.wikipedia.org/wiki/Depth-first_search

10
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@ -165,12 +165,14 @@ Solving specific problems
topics/autothrottle
topics/benchmarking
topics/jobs
topics/coroutines
topics/asyncio
:doc:`faq`
Get answers to most frequently asked questions.
:doc:`topics/debug`
Learn how to debug common problems of your scrapy spider.
Learn how to debug common problems of your Scrapy spider.
:doc:`topics/contracts`
Learn how to use contracts for testing your spiders.
@ -205,6 +207,12 @@ Solving specific problems
:doc:`topics/jobs`
Learn how to pause and resume crawls for large spiders.
:doc:`topics/coroutines`
Use the :ref:`coroutine syntax <async>`.
:doc:`topics/asyncio`
Use :mod:`asyncio` and :mod:`asyncio`-powered libraries.
.. _extending-scrapy:
Extending Scrapy

76
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@ -7,12 +7,12 @@ Installation guide
Installing Scrapy
=================
Scrapy runs on Python 3.5 or above
under CPython (default Python implementation) and PyPy (starting with PyPy 5.9).
Scrapy runs on Python 3.5 or above under CPython (default Python
implementation) and PyPy (starting with PyPy 5.9).
If you're using `Anaconda`_ or `Miniconda`_, you can install the package from
the `conda-forge`_ channel, which has up-to-date packages for Linux, Windows
and OS X.
and macOS.
To install Scrapy using ``conda``, run::
@ -65,7 +65,7 @@ please refer to their respective installation instructions:
* `lxml installation`_
* `cryptography installation`_
.. _lxml installation: http://lxml.de/installation.html
.. _lxml installation: https://lxml.de/installation.html
.. _cryptography installation: https://cryptography.io/en/latest/installation/
@ -78,38 +78,21 @@ TL;DR: We recommend installing Scrapy inside a virtual environment
on all platforms.
Python packages can be installed either globally (a.k.a system wide),
or in user-space. We do not recommend installing scrapy system wide.
or in user-space. We do not recommend installing Scrapy system wide.
Instead, we recommend that you install scrapy within a so-called
"virtual environment" (`virtualenv`_).
Virtualenvs allow you to not conflict with already-installed Python
Instead, we recommend that you install Scrapy within a so-called
"virtual environment" (:mod:`venv`).
Virtual environments allow you to not conflict with already-installed Python
system packages (which could break some of your system tools and scripts),
and still install packages normally with ``pip`` (without ``sudo`` and the likes).
To get started with virtual environments, see `virtualenv installation instructions`_.
To install it globally (having it globally installed actually helps here),
it should be a matter of running::
See :ref:`tut-venv` on how to create your virtual environment.
$ [sudo] pip install virtualenv
Check this `user guide`_ on how to create your virtualenv.
.. note::
If you use Linux or OS X, `virtualenvwrapper`_ is a handy tool to create virtualenvs.
Once you have created a virtualenv, you can install scrapy inside it with ``pip``,
Once you have created a virtual environment, you can install Scrapy inside it with ``pip``,
just like any other Python package.
(See :ref:`platform-specific guides <intro-install-platform-notes>`
below for non-Python dependencies that you may need to install beforehand).
Python virtualenvs can be created to use Python 2 by default, or Python 3 by default. As Scrapy
only supports Python 3, make sure you created a Python 3 virtualenv.
.. _virtualenv: https://virtualenv.pypa.io
.. _virtualenv installation instructions: https://virtualenv.pypa.io/en/stable/installation/
.. _virtualenvwrapper: https://virtualenvwrapper.readthedocs.io/en/latest/install.html
.. _user guide: https://virtualenv.pypa.io/en/stable/userguide/
.. _intro-install-platform-notes:
@ -144,7 +127,7 @@ albeit with potential issues with TLS connections.
typically too old and slow to catch up with latest Scrapy.
To install scrapy on Ubuntu (or Ubuntu-based) systems, you need to install
To install Scrapy on Ubuntu (or Ubuntu-based) systems, you need to install
these dependencies::
sudo apt-get install python3 python3-dev python3-pip libxml2-dev libxslt1-dev zlib1g-dev libffi-dev libssl-dev
@ -165,11 +148,11 @@ you can install Scrapy with ``pip`` after that::
.. _intro-install-macos:
Mac OS X
--------
macOS
-----
Building Scrapy's dependencies requires the presence of a C compiler and
development headers. On OS X this is typically provided by Apple’s Xcode
development headers. On macOS this is typically provided by Apple’s Xcode
development tools. To install the Xcode command line tools open a terminal
window and run::
@ -205,15 +188,12 @@ solutions:
brew update; brew upgrade python
* *(Optional)* Install Scrapy inside an isolated python environment.
* *(Optional)* :ref:`Install Scrapy inside a Python virtual environment
<intro-using-virtualenv>`.
This method is a workaround for the above OS X issue, but it's an overall
This method is a workaround for the above macOS issue, but it's an overall
good practice for managing dependencies and can complement the first method.
`virtualenv`_ is a tool you can use to create virtual environments in python.
We recommended reading a tutorial like
http://docs.python-guide.org/en/latest/dev/virtualenvs/ to get started.
After any of these workarounds you should be able to install Scrapy::
pip install Scrapy
@ -225,17 +205,17 @@ PyPy
We recommend using the latest PyPy version. The version tested is 5.9.0.
For PyPy3, only Linux installation was tested.
Most scrapy dependencides now have binary wheels for CPython, but not for PyPy.
Most Scrapy dependencides now have binary wheels for CPython, but not for PyPy.
This means that these dependecies will be built during installation.
On OS X, you are likely to face an issue with building Cryptography dependency,
On macOS, you are likely to face an issue with building Cryptography dependency,
solution to this problem is described
`here <https://github.com/pyca/cryptography/issues/2692#issuecomment-272773481>`_,
that is to ``brew install openssl`` and then export the flags that this command
recommends (only needed when installing scrapy). Installing on Linux has no special
recommends (only needed when installing Scrapy). Installing on Linux has no special
issues besides installing build dependencies.
Installing scrapy with PyPy on Windows is not tested.
Installing Scrapy with PyPy on Windows is not tested.
You can check that scrapy is installed correctly by running ``scrapy bench``.
You can check that Scrapy is installed correctly by running ``scrapy bench``.
If this command gives errors such as
``TypeError: ... got 2 unexpected keyword arguments``, this means
that setuptools was unable to pick up one PyPy-specific dependency.
@ -272,12 +252,12 @@ For details, see `Issue #2473 <https://github.com/scrapy/scrapy/issues/2473>`_.
.. _Python: https://www.python.org/
.. _pip: https://pip.pypa.io/en/latest/installing/
.. _lxml: http://lxml.de/
.. _parsel: https://pypi.python.org/pypi/parsel
.. _w3lib: https://pypi.python.org/pypi/w3lib
.. _twisted: https://twistedmatrix.com/
.. _cryptography: https://cryptography.io/
.. _pyOpenSSL: https://pypi.python.org/pypi/pyOpenSSL
.. _lxml: https://lxml.de/index.html
.. _parsel: https://pypi.org/project/parsel/
.. _w3lib: https://pypi.org/project/w3lib/
.. _twisted: https://twistedmatrix.com/trac/
.. _cryptography: https://cryptography.io/en/latest/
.. _pyOpenSSL: https://pypi.org/project/pyOpenSSL/
.. _setuptools: https://pypi.python.org/pypi/setuptools
.. _AUR Scrapy package: https://aur.archlinux.org/packages/scrapy/
.. _homebrew: https://brew.sh/

173
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@ -25,16 +25,16 @@ Scrapy.
If you're already familiar with other languages, and want to learn Python quickly, the `Python Tutorial`_ is a good resource.
If you're new to programming and want to start with Python, the following books
may be useful to you:
may be useful to you:
* `Automate the Boring Stuff With Python`_
* `How To Think Like a Computer Scientist`_
* `How To Think Like a Computer Scientist`_
* `Learn Python 3 The Hard Way`_
* `Learn Python 3 The Hard Way`_
You can also take a look at `this list of Python resources for non-programmers`_,
as well as the `suggested resources in the learnpython-subreddit`_.
as well as the `suggested resources in the learnpython-subreddit`_.
.. _Python: https://www.python.org/
.. _this list of Python resources for non-programmers: https://wiki.python.org/moin/BeginnersGuide/NonProgrammers
@ -62,7 +62,7 @@ This will create a ``tutorial`` directory with the following contents::
__init__.py
items.py # project items definition file
middlewares.py # project middlewares file
pipelines.py # project pipelines file
@ -212,7 +212,7 @@ using the :ref:`Scrapy shell <topics-shell>`. Run::
.. note::
Remember to always enclose urls in quotes when running Scrapy shell from
command-line, otherwise urls containing arguments (ie. ``&`` character)
command-line, otherwise urls containing arguments (i.e. ``&`` character)
will not work.
On Windows, use double quotes instead::
@ -252,30 +252,30 @@ The result of running ``response.css('title')`` is a list-like object called
and allow you to run further queries to fine-grain the selection or extract the
data.
To extract the text from the title above, you can do::
To extract the text from the title above, you can do:
>>> response.css('title::text').getall()
['Quotes to Scrape']
>>> response.css('title::text').getall()
['Quotes to Scrape']
There are two things to note here: one is that we've added ``::text`` to the
CSS query, to mean we want to select only the text elements directly inside
``<title>`` element. If we don't specify ``::text``, we'd get the full title
element, including its tags::
element, including its tags:
>>> response.css('title').getall()
['<title>Quotes to Scrape</title>']
>>> response.css('title').getall()
['<title>Quotes to Scrape</title>']
The other thing is that the result of calling ``.getall()`` is a list: it is
possible that a selector returns more than one result, so we extract them all.
When you know you just want the first result, as in this case, you can do::
When you know you just want the first result, as in this case, you can do:
>>> response.css('title::text').get()
'Quotes to Scrape'
>>> response.css('title::text').get()
'Quotes to Scrape'
As an alternative, you could've written::
As an alternative, you could've written:
>>> response.css('title::text')[0].get()
'Quotes to Scrape'
>>> response.css('title::text')[0].get()
'Quotes to Scrape'
However, using ``.get()`` directly on a :class:`~scrapy.selector.SelectorList`
instance avoids an ``IndexError`` and returns ``None`` when it doesn't
@ -287,15 +287,15 @@ to be scraped, you can at least get **some** data.
Besides the :meth:`~scrapy.selector.SelectorList.getall` and
:meth:`~scrapy.selector.SelectorList.get` methods, you can also use
the :meth:`~scrapy.selector.SelectorList.re` method to extract using `regular
expressions`_::
the :meth:`~scrapy.selector.SelectorList.re` method to extract using
:doc:`regular expressions <library/re>`:
>>> response.css('title::text').re(r'Quotes.*')
['Quotes to Scrape']
>>> response.css('title::text').re(r'Q\w+')
['Quotes']
>>> response.css('title::text').re(r'(\w+) to (\w+)')
['Quotes', 'Scrape']
>>> response.css('title::text').re(r'Quotes.*')
['Quotes to Scrape']
>>> response.css('title::text').re(r'Q\w+')
['Quotes']
>>> response.css('title::text').re(r'(\w+) to (\w+)')
['Quotes', 'Scrape']
In order to find the proper CSS selectors to use, you might find useful opening
the response page from the shell in your web browser using ``view(response)``.
@ -305,19 +305,18 @@ with a selector (see :ref:`topics-developer-tools`).
`Selector Gadget`_ is also a nice tool to quickly find CSS selector for
visually selected elements, which works in many browsers.
.. _regular expressions: https://docs.python.org/3/library/re.html
.. _Selector Gadget: http://selectorgadget.com/
.. _Selector Gadget: https://selectorgadget.com/
XPath: a brief intro
^^^^^^^^^^^^^^^^^^^^
Besides `CSS`_, Scrapy selectors also support using `XPath`_ expressions::
Besides `CSS`_, Scrapy selectors also support using `XPath`_ expressions:
>>> response.xpath('//title')
[<Selector xpath='//title' data='<title>Quotes to Scrape</title>'>]
>>> response.xpath('//title/text()').get()
'Quotes to Scrape'
>>> response.xpath('//title')
[<Selector xpath='//title' data='<title>Quotes to Scrape</title>'>]
>>> response.xpath('//title/text()').get()
'Quotes to Scrape'
XPath expressions are very powerful, and are the foundation of Scrapy
Selectors. In fact, CSS selectors are converted to XPath under-the-hood. You
@ -337,7 +336,7 @@ recommend `this tutorial to learn XPath through examples
<http://zvon.org/comp/r/tut-XPath_1.html>`_, and `this tutorial to learn "how
to think in XPath" <http://plasmasturm.org/log/xpath101/>`_.
.. _XPath: https://www.w3.org/TR/xpath
.. _XPath: https://www.w3.org/TR/xpath/all/
.. _CSS: https://www.w3.org/TR/selectors
Extracting quotes and authors
@ -372,35 +371,35 @@ we want::
$ scrapy shell 'http://quotes.toscrape.com'
We get a list of selectors for the quote HTML elements with::
We get a list of selectors for the quote HTML elements with:
>>> response.css("div.quote")
[<Selector xpath="descendant-or-self::div[@class and contains(concat(' ', normalize-space(@class), ' '), ' quote ')]" data='<div class="quote" itemscope itemtype...'>,
<Selector xpath="descendant-or-self::div[@class and contains(concat(' ', normalize-space(@class), ' '), ' quote ')]" data='<div class="quote" itemscope itemtype...'>,
...]
>>> response.css("div.quote")
[<Selector xpath="descendant-or-self::div[@class and contains(concat(' ', normalize-space(@class), ' '), ' quote ')]" data='<div class="quote" itemscope itemtype...'>,
<Selector xpath="descendant-or-self::div[@class and contains(concat(' ', normalize-space(@class), ' '), ' quote ')]" data='<div class="quote" itemscope itemtype...'>,
...]
Each of the selectors returned by the query above allows us to run further
queries over their sub-elements. Let's assign the first selector to a
variable, so that we can run our CSS selectors directly on a particular quote::
variable, so that we can run our CSS selectors directly on a particular quote:
>>> quote = response.css("div.quote")[0]
>>> quote = response.css("div.quote")[0]
Now, let's extract ``text``, ``author`` and the ``tags`` from that quote
using the ``quote`` object we just created::
using the ``quote`` object we just created:
>>> text = quote.css("span.text::text").get()
>>> text
'“The world as we have created it is a process of our thinking. It cannot be changed without changing our thinking.”'
>>> author = quote.css("small.author::text").get()
>>> author
'Albert Einstein'
>>> text = quote.css("span.text::text").get()
>>> text
'“The world as we have created it is a process of our thinking. It cannot be changed without changing our thinking.”'
>>> author = quote.css("small.author::text").get()
>>> author
'Albert Einstein'
Given that the tags are a list of strings, we can use the ``.getall()`` method
to get all of them::
to get all of them:
>>> tags = quote.css("div.tags a.tag::text").getall()
>>> tags
['change', 'deep-thoughts', 'thinking', 'world']
>>> tags = quote.css("div.tags a.tag::text").getall()
>>> tags
['change', 'deep-thoughts', 'thinking', 'world']
.. invisible-code-block: python
@ -409,16 +408,16 @@ to get all of them::
.. skip: next if(version_info < (3, 6), reason="Only Python 3.6+ dictionaries match the output")
Having figured out how to extract each bit, we can now iterate over all the
quotes elements and put them together into a Python dictionary::
quotes elements and put them together into a Python dictionary:
>>> for quote in response.css("div.quote"):
... text = quote.css("span.text::text").get()
... author = quote.css("small.author::text").get()
... tags = quote.css("div.tags a.tag::text").getall()
... print(dict(text=text, author=author, tags=tags))
{'text': '“The world as we have created it is a process of our thinking. It cannot be changed without changing our thinking.”', 'author': 'Albert Einstein', 'tags': ['change', 'deep-thoughts', 'thinking', 'world']}
{'text': '“It is our choices, Harry, that show what we truly are, far more than our abilities.”', 'author': 'J.K. Rowling', 'tags': ['abilities', 'choices']}
...
>>> for quote in response.css("div.quote"):
... text = quote.css("span.text::text").get()
... author = quote.css("small.author::text").get()
... tags = quote.css("div.tags a.tag::text").getall()
... print(dict(text=text, author=author, tags=tags))
{'text': '“The world as we have created it is a process of our thinking. It cannot be changed without changing our thinking.”', 'author': 'Albert Einstein', 'tags': ['change', 'deep-thoughts', 'thinking', 'world']}
{'text': '“It is our choices, Harry, that show what we truly are, far more than our abilities.”', 'author': 'J.K. Rowling', 'tags': ['abilities', 'choices']}
...
Extracting data in our spider
-----------------------------
@ -516,23 +515,23 @@ markup:
</li>
</ul>
We can try extracting it in the shell::
We can try extracting it in the shell:
>>> response.css('li.next a').get()
'<a href="/page/2/">Next <span aria-hidden="true">→</span></a>'
>>> response.css('li.next a').get()
'<a href="/page/2/">Next <span aria-hidden="true">→</span></a>'
This gets the anchor element, but we want the attribute ``href``. For that,
Scrapy supports a CSS extension that lets you select the attribute contents,
like this::
like this:
>>> response.css('li.next a::attr(href)').get()
'/page/2/'
>>> response.css('li.next a::attr(href)').get()
'/page/2/'
There is also an ``attrib`` property available
(see :ref:`selecting-attributes` for more)::
(see :ref:`selecting-attributes` for more):
>>> response.css('li.next a').attrib['href']
'/page/2/'
>>> response.css('li.next a').attrib['href']
'/page/2/'
Let's see now our spider modified to recursively follow the link to the next
page, extracting data from it::
@ -616,21 +615,25 @@ instance; you still have to yield this Request.
You can also pass a selector to ``response.follow`` instead of a string;
this selector should extract necessary attributes::
for href in response.css('li.next a::attr(href)'):
for href in response.css('ul.pager a::attr(href)'):
yield response.follow(href, callback=self.parse)
For ``<a>`` elements there is a shortcut: ``response.follow`` uses their href
attribute automatically. So the code can be shortened further::
for a in response.css('li.next a'):
for a in response.css('ul.pager a'):
yield response.follow(a, callback=self.parse)
.. note::
To create multiple requests from an iterable, you can use
:meth:`response.follow_all <scrapy.http.TextResponse.follow_all>` instead::
anchors = response.css('ul.pager a')
yield from response.follow_all(anchors, callback=self.parse)
or, shortening it further::
yield from response.follow_all(css='ul.pager a', callback=self.parse)
``response.follow(response.css('li.next a'))`` is not valid because
``response.css`` returns a list-like object with selectors for all results,
not a single selector. A ``for`` loop like in the example above, or
``response.follow(response.css('li.next a')[0])`` is fine.
More examples and patterns
--------------------------
@ -647,13 +650,11 @@ this time for scraping author information::
start_urls = ['http://quotes.toscrape.com/']
def parse(self, response):
# follow links to author pages
for href in response.css('.author + a::attr(href)'):
yield response.follow(href, self.parse_author)
author_page_links = response.css('.author + a')
yield from response.follow_all(author_page_links, self.parse_author)
# follow pagination links
for href in response.css('li.next a::attr(href)'):
yield response.follow(href, self.parse)
pagination_links = response.css('li.next a')
yield from response.follow_all(pagination_links, self.parse)
def parse_author(self, response):
def extract_with_css(query):
@ -669,8 +670,10 @@ This spider will start from the main page, it will follow all the links to the
authors pages calling the ``parse_author`` callback for each of them, and also
the pagination links with the ``parse`` callback as we saw before.
Here we're passing callbacks to ``response.follow`` as positional arguments
to make the code shorter; it also works for ``scrapy.Request``.
Here we're passing callbacks to
:meth:`response.follow_all <scrapy.http.TextResponse.follow_all>` as positional
arguments to make the code shorter; it also works for
:class:`~scrapy.http.Request`.
The ``parse_author`` callback defines a helper function to extract and cleanup the
data from a CSS query and yields the Python dict with the author data.

746
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8
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@ -1,4 +1,4 @@
Sphinx>=2.1
sphinx-hoverxref
sphinx-notfound-page
sphinx_rtd_theme
Sphinx>=3.0
sphinx-hoverxref>=0.2b1
sphinx-notfound-page>=0.4
sphinx_rtd_theme>=0.4

28
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@ -0,0 +1,28 @@
=======
asyncio
=======
.. versionadded:: 2.0
Scrapy has partial support :mod:`asyncio`. After you :ref:`install the asyncio
reactor <install-asyncio>`, you may use :mod:`asyncio` and
:mod:`asyncio`-powered libraries in any :doc:`coroutine <coroutines>`.
.. warning:: :mod:`asyncio` support in Scrapy is experimental. Future Scrapy
versions may introduce related changes without a deprecation
period or warning.
.. _install-asyncio:
Installing the asyncio reactor
==============================
To enable :mod:`asyncio` support, set the :setting:`TWISTED_REACTOR` setting to
``'twisted.internet.asyncioreactor.AsyncioSelectorReactor'``.
If you are using :class:`~scrapy.crawler.CrawlerRunner`, you also need to
install the :class:`~twisted.internet.asyncioreactor.AsyncioSelectorReactor`
reactor manually. You can do that using
:func:`~scrapy.utils.reactor.install_reactor`::
install_reactor('twisted.internet.asyncioreactor.AsyncioSelectorReactor')

2
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@ -11,7 +11,7 @@ Design goals
============
1. be nicer to sites instead of using default download delay of zero
2. automatically adjust scrapy to the optimum crawling speed, so the user
2. automatically adjust Scrapy to the optimum crawling speed, so the user
doesn't have to tune the download delays to find the optimum one.
The user only needs to specify the maximum concurrent requests
it allows, and the extension does the rest.

9
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@ -188,7 +188,7 @@ AjaxCrawlMiddleware helps to crawl them correctly.
It is turned OFF by default because it has some performance overhead,
and enabling it for focused crawls doesn't make much sense.
.. _ajax crawlable: https://developers.google.com/webmasters/ajax-crawling/docs/getting-started
.. _ajax crawlable: https://developers.google.com/search/docs/ajax-crawling/docs/getting-started
.. _broad-crawls-bfo:
@ -211,3 +211,10 @@ If your broad crawl shows a high memory usage, in addition to :ref:`crawling in
BFO order <broad-crawls-bfo>` and :ref:`lowering concurrency
<broad-crawls-concurrency>` you should :ref:`debug your memory leaks
<topics-leaks>`.
Install a specific Twisted reactor
==================================
If the crawl is exceeding the system's capabilities, you might want to try
installing a specific Twisted reactor, via the :setting:`TWISTED_REACTOR` setting.

2
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@ -29,7 +29,7 @@ in standard locations:
1. ``/etc/scrapy.cfg`` or ``c:\scrapy\scrapy.cfg`` (system-wide),
2. ``~/.config/scrapy.cfg`` (``$XDG_CONFIG_HOME``) and ``~/.scrapy.cfg`` (``$HOME``)
for global (user-wide) settings, and
3. ``scrapy.cfg`` inside a scrapy project's root (see next section).
3. ``scrapy.cfg`` inside a Scrapy project's root (see next section).
Settings from these files are merged in the listed order of preference:
user-defined values have higher priority than system-wide defaults

6
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@ -64,7 +64,7 @@ Use the :command:`check` command to run the contract checks.
Custom Contracts
================
If you find you need more power than the built-in scrapy contracts you can
If you find you need more power than the built-in Scrapy contracts you can
create and load your own contracts in the project by using the
:setting:`SPIDER_CONTRACTS` setting::
@ -136,7 +136,7 @@ Detecting check runs
====================
When ``scrapy check`` is running, the ``SCRAPY_CHECK`` environment variable is
set to the ``true`` string. You can use `os.environ`_ to perform any change to
set to the ``true`` string. You can use :data:`os.environ` to perform any change to
your spiders or your settings when ``scrapy check`` is used::
import os
@ -148,5 +148,3 @@ your spiders or your settings when ``scrapy check`` is used::
def __init__(self):
if os.environ.get('SCRAPY_CHECK'):
pass # Do some scraper adjustments when a check is running
.. _os.environ: https://docs.python.org/3/library/os.html#os.environ

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@ -0,0 +1,105 @@
==========
Coroutines
==========
.. versionadded:: 2.0
Scrapy has :ref:`partial support <coroutine-support>` for the
:ref:`coroutine syntax <async>`.
.. _coroutine-support:
Supported callables
===================
The following callables may be defined as coroutines using ``async def``, and
hence use coroutine syntax (e.g. ``await``, ``async for``, ``async with``):
- :class:`~scrapy.http.Request` callbacks.
The following are known caveats of the current implementation that we aim
to address in future versions of Scrapy:
- The callback output is not processed until the whole callback finishes.
As a side effect, if the callback raises an exception, none of its
output is processed.
- Because `asynchronous generators were introduced in Python 3.6`_, you
can only use ``yield`` if you are using Python 3.6 or later.
If you need to output multiple items or requests and you are using
Python 3.5, return an iterable (e.g. a list) instead.
- The :meth:`process_item` method of
:ref:`item pipelines <topics-item-pipeline>`.
- The
:meth:`~scrapy.downloadermiddlewares.DownloaderMiddleware.process_request`,
:meth:`~scrapy.downloadermiddlewares.DownloaderMiddleware.process_response`,
and
:meth:`~scrapy.downloadermiddlewares.DownloaderMiddleware.process_exception`
methods of
:ref:`downloader middlewares <topics-downloader-middleware-custom>`.
- :ref:`Signal handlers that support deferreds <signal-deferred>`.
.. _asynchronous generators were introduced in Python 3.6: https://www.python.org/dev/peps/pep-0525/
Usage
=====
There are several use cases for coroutines in Scrapy. Code that would
return Deferreds when written for previous Scrapy versions, such as downloader
middlewares and signal handlers, can be rewritten to be shorter and cleaner::
class DbPipeline:
def _update_item(self, data, item):
item['field'] = data
return item
def process_item(self, item, spider):
dfd = db.get_some_data(item['id'])
dfd.addCallback(self._update_item, item)
return dfd
becomes::
class DbPipeline:
async def process_item(self, item, spider):
item['field'] = await db.get_some_data(item['id'])
return item
Coroutines may be used to call asynchronous code. This includes other
coroutines, functions that return Deferreds and functions that return
:term:`awaitable objects <awaitable>` such as :class:`~asyncio.Future`.
This means you can use many useful Python libraries providing such code::
class MySpider(Spider):
# ...
async def parse_with_deferred(self, response):
additional_response = await treq.get('https://additional.url')
additional_data = await treq.content(additional_response)
# ... use response and additional_data to yield items and requests
async def parse_with_asyncio(self, response):
async with aiohttp.ClientSession() as session:
async with session.get('https://additional.url') as additional_response:
additional_data = await r.text()
# ... use response and additional_data to yield items and requests
.. note:: Many libraries that use coroutines, such as `aio-libs`_, require the
:mod:`asyncio` loop and to use them you need to
:doc:`enable asyncio support in Scrapy<asyncio>`.
Common use cases for asynchronous code include:
* requesting data from websites, databases and other services (in callbacks,
pipelines and middlewares);
* storing data in databases (in pipelines and middlewares);
* delaying the spider initialization until some external event (in the
:signal:`spider_opened` handler);
* calling asynchronous Scrapy methods like ``ExecutionEngine.download`` (see
:ref:`the screenshot pipeline example<ScreenshotPipeline>`).
.. _aio-libs: https://github.com/aio-libs

2
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@ -5,7 +5,7 @@ Debugging Spiders
=================
This document explains the most common techniques for debugging spiders.
Consider the following scrapy spider below::
Consider the following Scrapy spider below::
import scrapy
from myproject.items import MyItem

45
docs/topics/developer-tools.rst
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@ -39,7 +39,7 @@ Therefore, you should keep in mind the following things:
.. _topics-inspector:
Inspecting a website
===================================
====================
By far the most handy feature of the Developer Tools is the `Inspector`
feature, which allows you to inspect the underlying HTML code of
@ -79,13 +79,23 @@ sections and tags of a webpage, which greatly improves readability. You can
expand and collapse a tag by clicking on the arrow in front of it or by double
clicking directly on the tag. If we expand the ``span`` tag with the ``class=
"text"`` we will see the quote-text we clicked on. The `Inspector` lets you
copy XPaths to selected elements. Let's try it out: Right-click on the ``span``
tag, select ``Copy > XPath`` and paste it in the scrapy shell like so::
copy XPaths to selected elements. Let's try it out.
First open the Scrapy shell at http://quotes.toscrape.com/ in a terminal:
.. code-block:: none
$ scrapy shell "http://quotes.toscrape.com/"
(...)
>>> response.xpath('/html/body/div/div[2]/div[1]/div[1]/span[1]/text()').getall()
['"The world as we have created it is a process of our thinking. It cannot be changed without changing our thinking.”]
Then, back to your web browser, right-click on the ``span`` tag, select
``Copy > XPath`` and paste it in the Scrapy shell like so:
.. invisible-code-block: python
response = load_response('http://quotes.toscrape.com/', 'quotes.html')
>>> response.xpath('/html/body/div/div[2]/div[1]/div[1]/span[1]/text()').getall()
['“The world as we have created it is a process of our thinking. It cannot be changed without changing our thinking.”']
Adding ``text()`` at the end we are able to extract the first quote with this
basic selector. But this XPath is not really that clever. All it does is
@ -112,13 +122,13 @@ see each quote:
With this knowledge we can refine our XPath: Instead of a path to follow,
we'll simply select all ``span`` tags with the ``class="text"`` by using
the `has-class-extension`_::
the `has-class-extension`_:
>>> response.xpath('//span[has-class("text")]/text()').getall()
['"The world as we have created it is a process of our thinking. It cannot be changed without changing our thinking.”,
'“It is our choices, Harry, that show what we truly are, far more than our abilities.”',
'“There are only two ways to live your life. One is as though nothing is a miracle. The other is as though everything is a miracle.”',
(...)]
>>> response.xpath('//span[has-class("text")]/text()').getall()
['“The world as we have created it is a process of our thinking. It cannot be changed without changing our thinking.”',
'“It is our choices, Harry, that show what we truly are, far more than our abilities.”',
'“There are only two ways to live your life. One is as though nothing is a miracle. The other is as though everything is a miracle.”',
...]
And with one simple, cleverer XPath we are able to extract all quotes from
the page. We could have constructed a loop over our first XPath to increase
@ -132,7 +142,7 @@ a use case:
Say you want to find the ``Next`` button on the page. Type ``Next`` into the
search bar on the top right of the `Inspector`. You should get two results.
The first is a ``li`` tag with the ``class="text"``, the second the text
The first is a ``li`` tag with the ``class="next"``, the second the text
of an ``a`` tag. Right click on the ``a`` tag and select ``Scroll into View``.
If you hover over the tag, you'll see the button highlighted. From here
we could easily create a :ref:`Link Extractor <topics-link-extractors>` to
@ -159,7 +169,11 @@ The page is quite similar to the basic `quotes.toscrape.com`_-page,
but instead of the above-mentioned ``Next`` button, the page
automatically loads new quotes when you scroll to the bottom. We
could go ahead and try out different XPaths directly, but instead
we'll check another quite useful command from the scrapy shell::
we'll check another quite useful command from the Scrapy shell:
.. skip: next
.. code-block:: none
$ scrapy shell "quotes.toscrape.com/scroll"
(...)
@ -278,6 +292,9 @@ Alternatively, if you want to know the arguments needed to recreate that
request you can use the :func:`scrapy.utils.curl.curl_to_request_kwargs`
function to get a dictionary with the equivalent arguments.
Note that to translate a cURL command into a Scrapy request,
you may use `curl2scrapy <https://michael-shub.github.io/curl2scrapy/>`_.
As you can see, with a few inspections in the `Network`-tool we
were able to easily replicate the dynamic requests of the scrolling
functionality of the page. Crawling dynamic pages can be quite

37
docs/topics/downloader-middleware.rst
View File

@ -199,7 +199,7 @@ CookiesMiddleware
This middleware enables working with sites that require cookies, such as
those that use sessions. It keeps track of cookies sent by web servers, and
send them back on subsequent requests (from that spider), just like web
sends them back on subsequent requests (from that spider), just like web
browsers do.
The following settings can be used to configure the cookie middleware:
@ -259,8 +259,8 @@ COOKIES_DEBUG
Default: ``False``
If enabled, Scrapy will log all cookies sent in requests (ie. ``Cookie``
header) and all cookies received in responses (ie. ``Set-Cookie`` header).
If enabled, Scrapy will log all cookies sent in requests (i.e. ``Cookie``
header) and all cookies received in responses (i.e. ``Set-Cookie`` header).
Here's an example of a log with :setting:`COOKIES_DEBUG` enabled::
@ -672,7 +672,7 @@ sometimes a more nuanced policy is desirable.
This setting still respects ``Cache-Control: no-store`` directives in responses.
If you don't want that, filter ``no-store`` out of the Cache-Control headers in
responses you feedto the cache middleware.
responses you feed to the cache middleware.
.. setting:: HTTPCACHE_IGNORE_RESPONSE_CACHE_CONTROLS
@ -686,7 +686,7 @@ Default: ``[]``
List of Cache-Control directives in responses to be ignored.
Sites often set "no-store", "no-cache", "must-revalidate", etc., but get
upset at the traffic a spider can generate if it respects those
upset at the traffic a spider can generate if it actually respects those
directives. This allows to selectively ignore Cache-Control directives
that are known to be unimportant for the sites being crawled.
@ -709,7 +709,7 @@ HttpCompressionMiddleware
provided `brotlipy`_ is installed.
.. _brotli-compressed: https://www.ietf.org/rfc/rfc7932.txt
.. _brotlipy: https://pypi.python.org/pypi/brotlipy
.. _brotlipy: https://pypi.org/project/brotlipy/
HttpCompressionMiddleware Settings
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
@ -739,7 +739,7 @@ HttpProxyMiddleware
This middleware sets the HTTP proxy to use for requests, by setting the
``proxy`` meta value for :class:`~scrapy.http.Request` objects.
Like the Python standard library modules `urllib`_ and `urllib2`_, it obeys
Like the Python standard library module :mod:`urllib.request`, it obeys
the following environment variables:
* ``http_proxy``
@ -751,9 +751,6 @@ HttpProxyMiddleware
Keep in mind this value will take precedence over ``http_proxy``/``https_proxy``
environment variables, and it will also ignore ``no_proxy`` environment variable.
.. _urllib: https://docs.python.org/2/library/urllib.html
.. _urllib2: https://docs.python.org/2/library/urllib2.html
RedirectMiddleware
------------------
@ -829,6 +826,7 @@ REDIRECT_MAX_TIMES
Default: ``20``
The maximum number of redirections that will be followed for a single request.
After this maximum, the request's response is returned as is.
MetaRefreshMiddleware
---------------------
@ -868,10 +866,14 @@ Whether the Meta Refresh middleware will be enabled.
METAREFRESH_IGNORE_TAGS
^^^^^^^^^^^^^^^^^^^^^^^
Default: ``['script', 'noscript']``
Default: ``[]``
Meta tags within these tags are ignored.
.. versionchanged:: 2.0
The default value of :setting:`METAREFRESH_IGNORE_TAGS` changed from
``['script', 'noscript']`` to ``[]``.
.. setting:: METAREFRESH_MAXDELAY
METAREFRESH_MAXDELAY
@ -1032,13 +1034,12 @@ Scrapy uses this parser by default.
RobotFileParser
~~~~~~~~~~~~~~~
Based on `RobotFileParser
<https://docs.python.org/3.7/library/urllib.robotparser.html>`_:
Based on :class:`~urllib.robotparser.RobotFileParser`:
* is Python's built-in robots.txt_ parser
* is compliant with `Martijn Koster's 1996 draft specification
<http://www.robotstxt.org/norobots-rfc.txt>`_
<https://www.robotstxt.org/norobots-rfc.txt>`_
* lacks support for wildcard matching
@ -1061,7 +1062,7 @@ Based on `Reppy <https://github.com/seomoz/reppy/>`_:
<https://github.com/seomoz/rep-cpp>`_
* is compliant with `Martijn Koster's 1996 draft specification
<http://www.robotstxt.org/norobots-rfc.txt>`_
<https://www.robotstxt.org/norobots-rfc.txt>`_
* supports wildcard matching
@ -1086,7 +1087,7 @@ Based on `Robotexclusionrulesparser <http://nikitathespider.com/python/rerp/>`_:
* implemented in Python
* is compliant with `Martijn Koster's 1996 draft specification
<http://www.robotstxt.org/norobots-rfc.txt>`_
<https://www.robotstxt.org/norobots-rfc.txt>`_
* supports wildcard matching
@ -1115,7 +1116,7 @@ implementing the methods described below.
.. autoclass:: RobotParser
:members:
.. _robots.txt: http://www.robotstxt.org/
.. _robots.txt: https://www.robotstxt.org/
DownloaderStats
---------------
@ -1155,7 +1156,7 @@ AjaxCrawlMiddleware
Middleware that finds 'AJAX crawlable' page variants based
on meta-fragment html tag. See
https://developers.google.com/webmasters/ajax-crawling/docs/getting-started
https://developers.google.com/search/docs/ajax-crawling/docs/getting-started
for more info.
.. note::

47
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@ -104,6 +104,9 @@ If you get the expected response `sometimes`, but not always, the issue is
probably not your request, but the target server. The target server might be
buggy, overloaded, or :ref:`banning <bans>` some of your requests.
Note that to translate a cURL command into a Scrapy request,
you may use `curl2scrapy <https://michael-shub.github.io/curl2scrapy/>`_.
.. _topics-handling-response-formats:
Handling different response formats
@ -115,7 +118,7 @@ data from it depends on the type of response:
- If the response is HTML or XML, use :ref:`selectors
<topics-selectors>` as usual.
- If the response is JSON, use `json.loads`_ to load the desired data from
- If the response is JSON, use :func:`json.loads` to load the desired data from
:attr:`response.text <scrapy.http.TextResponse.text>`::
data = json.loads(response.text)
@ -130,8 +133,9 @@ data from it depends on the type of response:
- If the response is JavaScript, or HTML with a ``<script/>`` element
containing the desired data, see :ref:`topics-parsing-javascript`.
- If the response is CSS, use a `regular expression`_ to extract the desired
data from :attr:`response.text <scrapy.http.TextResponse.text>`.
- If the response is CSS, use a :doc:`regular expression <library/re>` to
extract the desired data from
:attr:`response.text <scrapy.http.TextResponse.text>`.
.. _topics-parsing-images:
@ -168,31 +172,32 @@ JavaScript code:
Once you have a string with the JavaScript code, you can extract the desired
data from it:
- You might be able to use a `regular expression`_ to extract the desired
data in JSON format, which you can then parse with `json.loads`_.
- You might be able to use a :doc:`regular expression <library/re>` to
extract the desired data in JSON format, which you can then parse with
:func:`json.loads`.
For example, if the JavaScript code contains a separate line like
``var data = {"field": "value"};`` you can extract that data as follows::
``var data = {"field": "value"};`` you can extract that data as follows:
>>> pattern = r'\bvar\s+data\s*=\s*(\{.*?\})\s*;\s*\n'
>>> json_data = response.css('script::text').re_first(pattern)
>>> json.loads(json_data)
{'field': 'value'}
>>> pattern = r'\bvar\s+data\s*=\s*(\{.*?\})\s*;\s*\n'
>>> json_data = response.css('script::text').re_first(pattern)
>>> json.loads(json_data)
{'field': 'value'}
- Otherwise, use js2xml_ to convert the JavaScript code into an XML document
that you can parse using :ref:`selectors <topics-selectors>`.
For example, if the JavaScript code contains
``var data = {field: "value"};`` you can extract that data as follows::
``var data = {field: "value"};`` you can extract that data as follows:
>>> import js2xml
>>> import lxml.etree
>>> from parsel import Selector
>>> javascript = response.css('script::text').get()
>>> xml = lxml.etree.tostring(js2xml.parse(javascript), encoding='unicode')
>>> selector = Selector(text=xml)
>>> selector.css('var[name="data"]').get()
'<var name="data"><object><property name="field"><string>value</string></property></object></var>'
>>> import js2xml
>>> import lxml.etree
>>> from parsel import Selector
>>> javascript = response.css('script::text').get()
>>> xml = lxml.etree.tostring(js2xml.parse(javascript), encoding='unicode')
>>> selector = Selector(text=xml)
>>> selector.css('var[name="data"]').get()
'<var name="data"><object><property name="field"><string>value</string></property></object></var>'
.. _topics-javascript-rendering:
@ -241,12 +246,10 @@ along with `scrapy-selenium`_ for seamless integration.
.. _headless browser: https://en.wikipedia.org/wiki/Headless_browser
.. _JavaScript: https://en.wikipedia.org/wiki/JavaScript
.. _js2xml: https://github.com/scrapinghub/js2xml
.. _json.loads: https://docs.python.org/library/json.html#json.loads
.. _pytesseract: https://github.com/madmaze/pytesseract
.. _regular expression: https://docs.python.org/library/re.html
.. _scrapy-selenium: https://github.com/clemfromspace/scrapy-selenium
.. _scrapy-splash: https://github.com/scrapy-plugins/scrapy-splash
.. _Selenium: https://www.seleniumhq.org/
.. _Selenium: https://www.selenium.dev/
.. _Splash: https://github.com/scrapinghub/splash
.. _tabula-py: https://github.com/chezou/tabula-py
.. _wget: https://www.gnu.org/software/wget/

4
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View File

@ -7,7 +7,7 @@ Sending e-mail
.. module:: scrapy.mail
:synopsis: Email sending facility
Although Python makes sending e-mails relatively easy via the `smtplib`_
Although Python makes sending e-mails relatively easy via the :mod:`smtplib`
library, Scrapy provides its own facility for sending e-mails which is very
easy to use and it's implemented using :doc:`Twisted non-blocking IO
<twisted:core/howto/defer-intro>`, to avoid interfering with the non-blocking
@ -15,8 +15,6 @@ IO of the crawler. It also provides a simple API for sending attachments and
it's very easy to configure, with a few :ref:`settings
<topics-email-settings>`.
.. _smtplib: https://docs.python.org/2/library/smtplib.html
Quick example
=============

27
docs/topics/exporters.rst
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@ -42,7 +42,7 @@ value of one of their fields::
from scrapy.exporters import XmlItemExporter
class PerYearXmlExportPipeline(object):
class PerYearXmlExportPipeline:
"""Distribute items across multiple XML files according to their 'year' field"""
def open_spider(self, spider):
@ -137,7 +137,7 @@ output examples, which assume you're exporting these two items::
BaseItemExporter
----------------
.. class:: BaseItemExporter(fields_to_export=None, export_empty_fields=False, encoding='utf-8', indent=0)
.. class:: BaseItemExporter(fields_to_export=None, export_empty_fields=False, encoding='utf-8', indent=0, dont_fail=False)
This is the (abstract) base class for all Item Exporters. It provides
support for common features used by all (concrete) Item Exporters, such as
@ -148,6 +148,9 @@ BaseItemExporter
populate their respective instance attributes: :attr:`fields_to_export`,
:attr:`export_empty_fields`, :attr:`encoding`, :attr:`indent`.
.. versionadded:: 2.0
The *dont_fail* parameter.
.. method:: export_item(item)
Exports the given item. This method must be implemented in subclasses.
@ -308,7 +311,7 @@ CsvItemExporter
The additional keyword arguments of this ``__init__`` method are passed to the
:class:`BaseItemExporter` ``__init__`` method, and the leftover arguments to the
`csv.writer`_ ``__init__`` method, so you can use any ``csv.writer`` ``__init__`` method
:func:`csv.writer` function, so you can use any :func:`csv.writer` function
argument to customize this exporter.
A typical output of this exporter would be::
@ -317,8 +320,6 @@ CsvItemExporter
Color TV,1200
DVD player,200
.. _csv.writer: https://docs.python.org/2/library/csv.html#csv.writer
PickleItemExporter
------------------
@ -332,15 +333,13 @@ PickleItemExporter
:param protocol: The pickle protocol to use.
:type protocol: int
For more information, refer to the `pickle module documentation`_.
For more information, see :mod:`pickle`.
The additional keyword arguments of this ``__init__`` method are passed to the
:class:`BaseItemExporter` ``__init__`` method.
Pickle isn't a human readable format, so no output examples are provided.
.. _pickle module documentation: https://docs.python.org/2/library/pickle.html
PprintItemExporter
------------------
@ -369,8 +368,8 @@ JsonItemExporter
Exports Items in JSON format to the specified file-like object, writing all
objects as a list of objects. The additional ``__init__`` method arguments are
passed to the :class:`BaseItemExporter` ``__init__`` method, and the leftover
arguments to the `JSONEncoder`_ ``__init__`` method, so you can use any
`JSONEncoder`_ ``__init__`` method argument to customize this exporter.
arguments to the :class:`~json.JSONEncoder` ``__init__`` method, so you can use any
:class:`~json.JSONEncoder` ``__init__`` method argument to customize this exporter.
:param file: the file-like object to use for exporting the data. Its ``write`` method should
accept ``bytes`` (a disk file opened in binary mode, a ``io.BytesIO`` object, etc)
@ -390,8 +389,6 @@ JsonItemExporter
stream-friendly format, consider using :class:`JsonLinesItemExporter`
instead, or splitting the output in multiple chunks.
.. _JSONEncoder: https://docs.python.org/2/library/json.html#json.JSONEncoder
JsonLinesItemExporter
---------------------
@ -400,8 +397,8 @@ JsonLinesItemExporter
Exports Items in JSON format to the specified file-like object, writing one
JSON-encoded item per line. The additional ``__init__`` method arguments are passed
to the :class:`BaseItemExporter` ``__init__`` method, and the leftover arguments to
the `JSONEncoder`_ ``__init__`` method, so you can use any `JSONEncoder`_
``__init__`` method argument to customize this exporter.
the :class:`~json.JSONEncoder` ``__init__`` method, so you can use any
:class:`~json.JSONEncoder` ``__init__`` method argument to customize this exporter.
:param file: the file-like object to use for exporting the data. Its ``write`` method should
accept ``bytes`` (a disk file opened in binary mode, a ``io.BytesIO`` object, etc)
@ -414,8 +411,6 @@ JsonLinesItemExporter
Unlike the one produced by :class:`JsonItemExporter`, the format produced by
this exporter is well suited for serializing large amounts of data.
.. _JSONEncoder: https://docs.python.org/2/library/json.html#json.JSONEncoder
MarshalItemExporter
-------------------

11
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@ -63,7 +63,7 @@ but disabled unless the :setting:`HTTPCACHE_ENABLED` setting is set.
Disabling an extension
======================
In order to disable an extension that comes enabled by default (ie. those
In order to disable an extension that comes enabled by default (i.e. those
included in the :setting:`EXTENSIONS_BASE` setting) you must set its order to
``None``. For example::
@ -107,7 +107,7 @@ Here is the code of such extension::
logger = logging.getLogger(__name__)
class SpiderOpenCloseLogging(object):
class SpiderOpenCloseLogging:
def __init__(self, item_count):
self.item_count = item_count
@ -345,7 +345,7 @@ signal is received. The information dumped is the following:
After the stack trace and engine status is dumped, the Scrapy process continues
running normally.
This extension only works on POSIX-compliant platforms (ie. not Windows),
This extension only works on POSIX-compliant platforms (i.e. not Windows),
because the `SIGQUIT`_ and `SIGUSR2`_ signals are not available on Windows.
There are at least two ways to send Scrapy the `SIGQUIT`_ signal:
@ -364,13 +364,12 @@ Debugger extension
.. class:: Debugger
Invokes a `Python debugger`_ inside a running Scrapy process when a `SIGUSR2`_
Invokes a :doc:`Python debugger <library/pdb>` inside a running Scrapy process when a `SIGUSR2`_
signal is received. After the debugger is exited, the Scrapy process continues
running normally.
For more info see `Debugging in Python`_.
This extension only works on POSIX-compliant platforms (ie. not Windows).
This extension only works on POSIX-compliant platforms (i.e. not Windows).
.. _Python debugger: https://docs.python.org/2/library/pdb.html
.. _Debugging in Python: https://pythonconquerstheuniverse.wordpress.com/2009/09/10/debugging-in-python/

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@ -12,7 +12,7 @@ generating an "export file" with the scraped data (commonly called "export
feed") to be consumed by other systems.
Scrapy provides this functionality out of the box with the Feed Exports, which
allows you to generate a feed with the scraped items, using multiple
allows you to generate feeds with the scraped items, using multiple
serialization formats and storage backends.
.. _topics-feed-format:
@ -36,7 +36,7 @@ But you can also extend the supported format through the
JSON
----
* :setting:`FEED_FORMAT`: ``json``
* Value for the ``format`` key in the :setting:`FEEDS` setting: ``json``
* Exporter used: :class:`~scrapy.exporters.JsonItemExporter`
* See :ref:`this warning <json-with-large-data>` if you're using JSON with
large feeds.
@ -46,7 +46,7 @@ JSON
JSON lines
----------
* :setting:`FEED_FORMAT`: ``jsonlines``
* Value for the ``format`` key in the :setting:`FEEDS` setting: ``jsonlines``
* Exporter used: :class:`~scrapy.exporters.JsonLinesItemExporter`
.. _topics-feed-format-csv:
@ -54,7 +54,7 @@ JSON lines
CSV
---
* :setting:`FEED_FORMAT`: ``csv``
* Value for the ``format`` key in the :setting:`FEEDS` setting: ``csv``
* Exporter used: :class:`~scrapy.exporters.CsvItemExporter`
* To specify columns to export and their order use
:setting:`FEED_EXPORT_FIELDS`. Other feed exporters can also use this
@ -66,7 +66,7 @@ CSV
XML
---
* :setting:`FEED_FORMAT`: ``xml``
* Value for the ``format`` key in the :setting:`FEEDS` setting: ``xml``
* Exporter used: :class:`~scrapy.exporters.XmlItemExporter`
.. _topics-feed-format-pickle:
@ -74,7 +74,7 @@ XML
Pickle
------
* :setting:`FEED_FORMAT`: ``pickle``
* Value for the ``format`` key in the :setting:`FEEDS` setting: ``pickle``
* Exporter used: :class:`~scrapy.exporters.PickleItemExporter`
.. _topics-feed-format-marshal:
@ -82,7 +82,7 @@ Pickle
Marshal
-------
* :setting:`FEED_FORMAT`: ``marshal``
* Value for the ``format`` key in the :setting:`FEEDS` setting: ``marshal``
* Exporter used: :class:`~scrapy.exporters.MarshalItemExporter`
@ -91,8 +91,8 @@ Marshal
Storages
========
When using the feed exports you define where to store the feed using a URI_
(through the :setting:`FEED_URI` setting). The feed exports supports multiple
When using the feed exports you define where to store the feed using one or multiple URIs_
(through the :setting:`FEEDS` setting). The feed exports supports multiple
storage backend types which are defined by the URI scheme.
The storages backends supported out of the box are:
@ -211,38 +211,66 @@ Settings
These are the settings used for configuring the feed exports:
* :setting:`FEED_URI` (mandatory)
* :setting:`FEED_FORMAT`
* :setting:`FEEDS` (mandatory)
* :setting:`FEED_EXPORT_ENCODING`
* :setting:`FEED_STORE_EMPTY`
* :setting:`FEED_EXPORT_FIELDS`
* :setting:`FEED_EXPORT_INDENT`
* :setting:`FEED_STORAGES`
* :setting:`FEED_STORAGE_FTP_ACTIVE`
* :setting:`FEED_STORAGE_S3_ACL`
* :setting:`FEED_EXPORTERS`
* :setting:`FEED_STORE_EMPTY`
* :setting:`FEED_EXPORT_ENCODING`
* :setting:`FEED_EXPORT_FIELDS`
* :setting:`FEED_EXPORT_INDENT`
.. currentmodule:: scrapy.extensions.feedexport
.. setting:: FEED_URI
.. setting:: FEEDS
FEED_URI
--------
FEEDS
-----
Default: ``None``
.. versionadded:: 2.1
The URI of the export feed. See :ref:`topics-feed-storage-backends` for
supported URI schemes.
Default: ``{}``
This setting is required for enabling the feed exports.
A dictionary in which every key is a feed URI (or a :class:`pathlib.Path`
object) and each value is a nested dictionary containing configuration
parameters for the specific feed.
This setting is required for enabling the feed export feature.
.. setting:: FEED_FORMAT
See :ref:`topics-feed-storage-backends` for supported URI schemes.
FEED_FORMAT
-----------
For instance::
The serialization format to be used for the feed. See
:ref:`topics-feed-format` for possible values.
{
'items.json': {
'format': 'json',
'encoding': 'utf8',
'store_empty': False,
'fields': None,
'indent': 4,
},
'/home/user/documents/items.xml': {
'format': 'xml',
'fields': ['name', 'price'],
'encoding': 'latin1',
'indent': 8,
},
pathlib.Path('items.csv'): {
'format': 'csv',
'fields': ['price', 'name'],
},
}
The following is a list of the accepted keys and the setting that is used
as a fallback value if that key is not provided for a specific feed definition.
* ``format``: the serialization format to be used for the feed.
See :ref:`topics-feed-format` for possible values.
Mandatory, no fallback setting
* ``encoding``: falls back to :setting:`FEED_EXPORT_ENCODING`
* ``fields``: falls back to :setting:`FEED_EXPORT_FIELDS`
* ``indent``: falls back to :setting:`FEED_EXPORT_INDENT`
* ``store_empty``: falls back to :setting:`FEED_STORE_EMPTY`
.. setting:: FEED_EXPORT_ENCODING
@ -301,7 +329,7 @@ FEED_STORE_EMPTY
Default: ``False``
Whether to export empty feeds (ie. feeds with no items).
Whether to export empty feeds (i.e. feeds with no items).
.. setting:: FEED_STORAGES
@ -397,7 +425,7 @@ format in :setting:`FEED_EXPORTERS`. E.g., to disable the built-in CSV exporter
'csv': None,
}
.. _URI: https://en.wikipedia.org/wiki/Uniform_Resource_Identifier
.. _URIs: https://en.wikipedia.org/wiki/Uniform_Resource_Identifier
.. _Amazon S3: https://aws.amazon.com/s3/
.. _botocore: https://github.com/boto/botocore
.. _Canned ACL: https://docs.aws.amazon.com/AmazonS3/latest/dev/acl-overview.html#canned-acl

27
docs/topics/item-pipeline.rst
View File

@ -81,7 +81,7 @@ contain a price::
from scrapy.exceptions import DropItem
class PricePipeline(object):
class PricePipeline:
vat_factor = 1.15
@ -103,7 +103,7 @@ format::
import json
class JsonWriterPipeline(object):
class JsonWriterPipeline:
def open_spider(self, spider):
self.file = open('items.jl', 'w')
@ -132,7 +132,7 @@ method and how to clean up the resources properly.::
import pymongo
class MongoPipeline(object):
class MongoPipeline:
collection_name = 'scrapy_items'
@ -158,18 +158,20 @@ method and how to clean up the resources properly.::
self.db[self.collection_name].insert_one(dict(item))
return item
.. _MongoDB: https://www.mongodb.org/
.. _pymongo: https://api.mongodb.org/python/current/
.. _MongoDB: https://www.mongodb.com/
.. _pymongo: https://api.mongodb.com/python/current/
.. _ScreenshotPipeline:
Take screenshot of item
-----------------------
This example demonstrates how to return a
:class:`~twisted.internet.defer.Deferred` from the :meth:`process_item` method.
It uses Splash_ to render screenshot of item url. Pipeline
makes request to locally running instance of Splash_. After request is downloaded
and Deferred callback fires, it saves item to a file and adds filename to an item.
makes request to locally running instance of Splash_. After request is downloaded,
it saves the screenshot to a file and adds filename to the item.
::
@ -178,21 +180,18 @@ and Deferred callback fires, it saves item to a file and adds filename to an ite
from urllib.parse import quote
class ScreenshotPipeline(object):
class ScreenshotPipeline:
"""Pipeline that uses Splash to render screenshot of
every Scrapy item."""
SPLASH_URL = "http://localhost:8050/render.png?url={}"
def process_item(self, item, spider):
async def process_item(self, item, spider):
encoded_item_url = quote(item["url"])
screenshot_url = self.SPLASH_URL.format(encoded_item_url)
request = scrapy.Request(screenshot_url)
dfd = spider.crawler.engine.download(request, spider)
dfd.addBoth(self.return_item, item)
return dfd
response = await spider.crawler.engine.download(request, spider)
def return_item(self, response, item):
if response.status != 200:
# Error happened, return item.
return item
@ -220,7 +219,7 @@ returns multiples items with the same id::
from scrapy.exceptions import DropItem
class DuplicatesPipeline(object):
class DuplicatesPipeline:
def __init__(self):
self.ids_seen = set()

137
docs/topics/items.rst
View File

@ -15,8 +15,8 @@ especially in a larger project with many spiders.
To define common output data format Scrapy provides the :class:`Item` class.
:class:`Item` objects are simple containers used to collect the scraped data.
They provide a `dictionary-like`_ API with a convenient syntax for declaring
their available fields.
They provide an API similar to :class:`dict` API with a convenient syntax
for declaring their available fields.
Various Scrapy components use extra information provided by Items:
exporters look at declared fields to figure out columns to export,
@ -24,8 +24,6 @@ serialization can be customized using Item fields metadata, :mod:`trackref`
tracks Item instances to help find memory leaks
(see :ref:`topics-leaks-trackrefs`), etc.
.. _dictionary-like: https://docs.python.org/2/library/stdtypes.html#dict
.. _topics-items-declaring:
Declaring Items
@ -79,82 +77,79 @@ Working with Items
Here are some examples of common tasks performed with items, using the
``Product`` item :ref:`declared above <topics-items-declaring>`. You will
notice the API is very similar to the `dict API`_.
notice the API is very similar to the :class:`dict` API.
Creating items
--------------
::
>>> product = Product(name='Desktop PC', price=1000)
>>> print(product)
Product(name='Desktop PC', price=1000)
>>> product = Product(name='Desktop PC', price=1000)
>>> print(product)
Product(name='Desktop PC', price=1000)
Getting field values
--------------------
::
>>> product['name']
Desktop PC
>>> product.get('name')
Desktop PC
>>> product['name']
Desktop PC
>>> product.get('name')
Desktop PC
>>> product['price']
1000
>>> product['price']
1000
>>> product['last_updated']
Traceback (most recent call last):
...
KeyError: 'last_updated'
>>> product['last_updated']
Traceback (most recent call last):
...
KeyError: 'last_updated'
>>> product.get('last_updated', 'not set')
not set
>>> product.get('last_updated', 'not set')
not set
>>> product['lala'] # getting unknown field
Traceback (most recent call last):
...
KeyError: 'lala'
>>> product['lala'] # getting unknown field
Traceback (most recent call last):
...
KeyError: 'lala'
>>> product.get('lala', 'unknown field')
'unknown field'
>>> product.get('lala', 'unknown field')
'unknown field'
>>> 'name' in product # is name field populated?
True
>>> 'name' in product # is name field populated?
True
>>> 'last_updated' in product # is last_updated populated?
False
>>> 'last_updated' in product # is last_updated populated?
False
>>> 'last_updated' in product.fields # is last_updated a declared field?
True
>>> 'last_updated' in product.fields # is last_updated a declared field?
True
>>> 'lala' in product.fields # is lala a declared field?
False
>>> 'lala' in product.fields # is lala a declared field?
False
Setting field values
--------------------
::
>>> product['last_updated'] = 'today'
>>> product['last_updated']
today
>>> product['last_updated'] = 'today'
>>> product['last_updated']
today
>>> product['lala'] = 'test' # setting unknown field
Traceback (most recent call last):
...
KeyError: 'Product does not support field: lala'
>>> product['lala'] = 'test' # setting unknown field
Traceback (most recent call last):
...
KeyError: 'Product does not support field: lala'
Accessing all populated values
------------------------------
To access all populated values, just use the typical `dict API`_::
To access all populated values, just use the typical :class:`dict` API:
>>> product.keys()
['price', 'name']
>>> product.keys()
['price', 'name']
>>> product.items()
[('price', 1000), ('name', 'Desktop PC')]
>>> product.items()
[('price', 1000), ('name', 'Desktop PC')]
.. _copying-items:
@ -165,11 +160,9 @@ Copying items
To copy an item, you must first decide whether you want a shallow copy or a
deep copy.
If your item contains mutable_ values like lists or dictionaries, a shallow
copy will keep references to the same mutable values across all different
copies.
.. _mutable: https://docs.python.org/glossary.html#term-mutable
If your item contains :term:`mutable` values like lists or dictionaries,
a shallow copy will keep references to the same mutable values across all
different copies.
For example, if you have an item with a list of tags, and you create a shallow
copy of that item, both the original item and the copy have the same list of
@ -178,9 +171,7 @@ other item as well.
If that is not the desired behavior, use a deep copy instead.
See the `documentation of the copy module`_ for more information.
.. _documentation of the copy module: https://docs.python.org/library/copy.html
See :mod:`copy` for more information.
To create a shallow copy of an item, you can either call
:meth:`~scrapy.item.Item.copy` on an existing item
@ -194,20 +185,21 @@ To create a deep copy, call :meth:`~scrapy.item.Item.deepcopy` instead
Other common tasks
------------------
Creating dicts from items::
Creating dicts from items:
>>> dict(product) # create a dict from all populated values
{'price': 1000, 'name': 'Desktop PC'}
>>> dict(product) # create a dict from all populated values
{'price': 1000, 'name': 'Desktop PC'}
Creating items from dicts::
Creating items from dicts:
>>> Product({'name': 'Laptop PC', 'price': 1500})
Product(price=1500, name='Laptop PC')
>>> Product({'name': 'Laptop PC', 'price': 1500})
Product(price=1500, name='Laptop PC')
>>> Product({'name': 'Laptop PC', 'lala': 1500}) # warning: unknown field in dict
Traceback (most recent call last):
...
KeyError: 'Product does not support field: lala'
>>> Product({'name': 'Laptop PC', 'lala': 1500}) # warning: unknown field in dict
Traceback (most recent call last):
...
KeyError: 'Product does not support field: lala'
Extending Items
===============
@ -237,8 +229,8 @@ Item objects
Return a new Item optionally initialized from the given argument.
Items replicate the standard `dict API`_, including its ``__init__`` method, and
also provide the following additional API members:
Items replicate the standard :class:`dict` API, including its ``__init__``
method, and also provide the following additional API members:
.. automethod:: copy
@ -251,22 +243,17 @@ Item objects
:class:`Field` objects used in the :ref:`Item declaration
<topics-items-declaring>`.
.. _dict API: https://docs.python.org/2/library/stdtypes.html#dict
Field objects
=============
.. class:: Field([arg])
The :class:`Field` class is just an alias to the built-in `dict`_ class and
The :class:`Field` class is just an alias to the built-in :class:`dict` class and
doesn't provide any extra functionality or attributes. In other words,
:class:`Field` objects are plain-old Python dicts. A separate class is used
to support the :ref:`item declaration syntax <topics-items-declaring>`
based on class attributes.
.. _dict: https://docs.python.org/2/library/stdtypes.html#dict
Other classes related to Item
=============================

7
docs/topics/jobs.rst
View File

@ -22,7 +22,7 @@ Job directory
To enable persistence support you just need to define a *job directory* through
the ``JOBDIR`` setting. This directory will be for storing all required data to
keep the state of a single job (ie. a spider run). It's important to note that
keep the state of a single job (i.e. a spider run). It's important to note that
this directory must not be shared by different spiders, or even different
jobs/runs of the same spider, as it's meant to be used for storing the state of
a *single* job.
@ -68,13 +68,16 @@ Cookies may expire. So, if you don't resume your spider quickly the requests
scheduled may no longer work. This won't be an issue if you spider doesn't rely
on cookies.
.. _request-serialization:
Request serialization
---------------------
For persistence to work, :class:`~scrapy.http.Request` objects must be
serializable with :mod:`pickle`, except for the ``callback`` and ``errback``
values passed to their ``__init__`` method, which must be methods of the
runnning :class:`~scrapy.spiders.Spider` class.
running :class:`~scrapy.spiders.Spider` class.
If you wish to log the requests that couldn't be serialized, you can set the
:setting:`SCHEDULER_DEBUG` setting to ``True`` in the project's settings page.

154
docs/topics/leaks.rst
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@ -17,8 +17,8 @@ what is known as a "memory leak".
To help debugging memory leaks, Scrapy provides a built-in mechanism for
tracking objects references called :ref:`trackref <topics-leaks-trackrefs>`,
and you can also use a third-party library called :ref:`Guppy
<topics-leaks-guppy>` for more advanced memory debugging (see below for more
and you can also use a third-party library called :ref:`muppy
<topics-leaks-muppy>` for more advanced memory debugging (see below for more
info). Both mechanisms must be used from the :ref:`Telnet Console
<topics-telnetconsole>`.
@ -110,7 +110,7 @@ ties the response lifetime to the requests' one, and that would definitely
cause memory leaks.
Let's see how we can discover the cause (without knowing it
a-priori, of course) by using the ``trackref`` tool.
a priori, of course) by using the ``trackref`` tool.
After the crawler is running for a few minutes and we notice its memory usage
has grown a lot, we can enter its telnet console and check the live
@ -132,21 +132,21 @@ and check the code of the spider to discover the nasty line that is
generating the leaks (passing response references inside requests).
Sometimes extra information about live objects can be helpful.
Let's check the oldest response::
Let's check the oldest response:
>>> from scrapy.utils.trackref import get_oldest
>>> r = get_oldest('HtmlResponse')
>>> r.url
'http://www.somenastyspider.com/product.php?pid=123'
>>> from scrapy.utils.trackref import get_oldest
>>> r = get_oldest('HtmlResponse')
>>> r.url
'http://www.somenastyspider.com/product.php?pid=123'
If you want to iterate over all objects, instead of getting the oldest one, you
can use the :func:`scrapy.utils.trackref.iter_all` function::
can use the :func:`scrapy.utils.trackref.iter_all` function:
>>> from scrapy.utils.trackref import iter_all
>>> [r.url for r in iter_all('HtmlResponse')]
['http://www.somenastyspider.com/product.php?pid=123',
'http://www.somenastyspider.com/product.php?pid=584',
...
>>> from scrapy.utils.trackref import iter_all
>>> [r.url for r in iter_all('HtmlResponse')]
['http://www.somenastyspider.com/product.php?pid=123',
'http://www.somenastyspider.com/product.php?pid=584',
...]
Too many spiders?
-----------------
@ -155,10 +155,10 @@ If your project has too many spiders executed in parallel,
the output of :func:`prefs()` can be difficult to read.
For this reason, that function has a ``ignore`` argument which can be used to
ignore a particular class (and all its subclases). For
example, this won't show any live references to spiders::
example, this won't show any live references to spiders:
>>> from scrapy.spiders import Spider
>>> prefs(ignore=Spider)
>>> from scrapy.spiders import Spider
>>> prefs(ignore=Spider)
.. module:: scrapy.utils.trackref
:synopsis: Track references of live objects
@ -170,7 +170,7 @@ Here are the functions available in the :mod:`~scrapy.utils.trackref` module.
.. class:: object_ref
Inherit from this class (instead of object) if you want to track live
Inherit from this class if you want to track live
instances with the ``trackref`` module.
.. function:: print_live_refs(class_name, ignore=NoneType)
@ -193,9 +193,9 @@ Here are the functions available in the :mod:`~scrapy.utils.trackref` module.
``None`` if none is found. Use :func:`print_live_refs` first to get a list
of all tracked live objects per class name.
.. _topics-leaks-guppy:
.. _topics-leaks-muppy:
Debugging memory leaks with Guppy
Debugging memory leaks with muppy
=================================
``trackref`` provides a very convenient mechanism for tracking down memory
@ -203,63 +203,9 @@ leaks, but it only keeps track of the objects that are more likely to cause
memory leaks (Requests, Responses, Items, and Selectors). However, there are
other cases where the memory leaks could come from other (more or less obscure)
objects. If this is your case, and you can't find your leaks using ``trackref``,
you still have another resource: the `Guppy library`_.
If you're using Python3, see :ref:`topics-leaks-muppy`.
you still have another resource: the muppy library.
.. _Guppy library: https://pypi.python.org/pypi/guppy
If you use ``pip``, you can install Guppy with the following command::
pip install guppy
The telnet console also comes with a built-in shortcut (``hpy``) for accessing
Guppy heap objects. Here's an example to view all Python objects available in
the heap using Guppy::
>>> x = hpy.heap()
>>> x.bytype
Partition of a set of 297033 objects. Total size = 52587824 bytes.
Index Count % Size % Cumulative % Type
0 22307 8 16423880 31 16423880 31 dict
1 122285 41 12441544 24 28865424 55 str
2 68346 23 5966696 11 34832120 66 tuple
3 227 0 5836528 11 40668648 77 unicode
4 2461 1 2222272 4 42890920 82 type
5 16870 6 2024400 4 44915320 85 function
6 13949 5 1673880 3 46589200 89 types.CodeType
7 13422 5 1653104 3 48242304 92 list
8 3735 1 1173680 2 49415984 94 _sre.SRE_Pattern
9 1209 0 456936 1 49872920 95 scrapy.http.headers.Headers
<1676 more rows. Type e.g. '_.more' to view.>
You can see that most space is used by dicts. Then, if you want to see from
which attribute those dicts are referenced, you could do::
>>> x.bytype[0].byvia
Partition of a set of 22307 objects. Total size = 16423880 bytes.
Index Count % Size % Cumulative % Referred Via:
0 10982 49 9416336 57 9416336 57 '.__dict__'
1 1820 8 2681504 16 12097840 74 '.__dict__', '.func_globals'
2 3097 14 1122904 7 13220744 80
3 990 4 277200 2 13497944 82 "['cookies']"
4 987 4 276360 2 13774304 84 "['cache']"
5 985 4 275800 2 14050104 86 "['meta']"
6 897 4 251160 2 14301264 87 '[2]'
7 1 0 196888 1 14498152 88 "['moduleDict']", "['modules']"
8 672 3 188160 1 14686312 89 "['cb_kwargs']"
9 27 0 155016 1 14841328 90 '[1]'
<333 more rows. Type e.g. '_.more' to view.>
As you can see, the Guppy module is very powerful but also requires some deep
knowledge about Python internals. For more info about Guppy, refer to the
`Guppy documentation`_.
.. _Guppy documentation: http://guppy-pe.sourceforge.net/
.. _topics-leaks-muppy:
Debugging memory leaks with muppy
=================================
You can use muppy from `Pympler`_.
.. _Pympler: https://pypi.org/project/Pympler/
@ -269,32 +215,32 @@ If you use ``pip``, you can install muppy with the following command::
pip install Pympler
Here's an example to view all Python objects available in
the heap using muppy::
the heap using muppy:
>>> from pympler import muppy
>>> all_objects = muppy.get_objects()
>>> len(all_objects)
28667
>>> from pympler import summary
>>> suml = summary.summarize(all_objects)
>>> summary.print_(suml)
types | # objects | total size
==================================== | =========== | ============
<class 'str | 9822 | 1.10 MB
<class 'dict | 1658 | 856.62 KB
<class 'type | 436 | 443.60 KB
<class 'code | 2974 | 419.56 KB
<class '_io.BufferedWriter | 2 | 256.34 KB
<class 'set | 420 | 159.88 KB
<class '_io.BufferedReader | 1 | 128.17 KB
<class 'wrapper_descriptor | 1130 | 88.28 KB
<class 'tuple | 1304 | 86.57 KB
<class 'weakref | 1013 | 79.14 KB
<class 'builtin_function_or_method | 958 | 67.36 KB
<class 'method_descriptor | 865 | 60.82 KB
<class 'abc.ABCMeta | 62 | 59.96 KB
<class 'list | 446 | 58.52 KB
<class 'int | 1425 | 43.20 KB
>>> from pympler import muppy
>>> all_objects = muppy.get_objects()
>>> len(all_objects)
28667
>>> from pympler import summary
>>> suml = summary.summarize(all_objects)
>>> summary.print_(suml)
types | # objects | total size
==================================== | =========== | ============
<class 'str | 9822 | 1.10 MB
<class 'dict | 1658 | 856.62 KB
<class 'type | 436 | 443.60 KB
<class 'code | 2974 | 419.56 KB
<class '_io.BufferedWriter | 2 | 256.34 KB
<class 'set | 420 | 159.88 KB
<class '_io.BufferedReader | 1 | 128.17 KB
<class 'wrapper_descriptor | 1130 | 88.28 KB
<class 'tuple | 1304 | 86.57 KB
<class 'weakref | 1013 | 79.14 KB
<class 'builtin_function_or_method | 958 | 67.36 KB
<class 'method_descriptor | 865 | 60.82 KB
<class 'abc.ABCMeta | 62 | 59.96 KB
<class 'list | 446 | 58.52 KB
<class 'int | 1425 | 43.20 KB
For more info about muppy, refer to the `muppy documentation`_.
@ -311,9 +257,9 @@ though neither Scrapy nor your project are leaking memory. This is due to a
(not so well) known problem of Python, which may not return released memory to
the operating system in some cases. For more information on this issue see:
* `Python Memory Management <http://www.evanjones.ca/python-memory.html>`_
* `Python Memory Management Part 2 <http://www.evanjones.ca/python-memory-part2.html>`_
* `Python Memory Management Part 3 <http://www.evanjones.ca/python-memory-part3.html>`_
* `Python Memory Management <https://www.evanjones.ca/python-memory.html>`_
* `Python Memory Management Part 2 <https://www.evanjones.ca/python-memory-part2.html>`_
* `Python Memory Management Part 3 <https://www.evanjones.ca/python-memory-part3.html>`_
The improvements proposed by Evan Jones, which are detailed in `this paper`_,
got merged in Python 2.5, but this only reduces the problem, it doesn't fix it
@ -327,7 +273,7 @@ completely. To quote the paper:
to move to a compacting garbage collector, which is able to move objects in
memory. This would require significant changes to the Python interpreter.*
.. _this paper: http://www.evanjones.ca/memoryallocator/
.. _this paper: https://www.evanjones.ca/memoryallocator/
To keep memory consumption reasonable you can split the job into several
smaller jobs or enable :ref:`persistent job queue <topics-jobs>`

57
docs/topics/link-extractors.rst
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@ -4,46 +4,33 @@
Link Extractors
===============
Link extractors are objects whose only purpose is to extract links from web
pages (:class:`scrapy.http.Response` objects) which will be eventually
followed.
A link extractor is an object that extracts links from responses.
There is ``scrapy.linkextractors.LinkExtractor`` available
in Scrapy, but you can create your own custom Link Extractors to suit your
needs by implementing a simple interface.
The only public method that every link extractor has is ``extract_links``,
which receives a :class:`~scrapy.http.Response` object and returns a list
of :class:`scrapy.link.Link` objects. Link extractors are meant to be
instantiated once and their ``extract_links`` method called several times
with different responses to extract links to follow.
Link extractors are used in the :class:`~scrapy.spiders.CrawlSpider`
class (available in Scrapy), through a set of rules, but you can also use it in
your spiders, even if you don't subclass from
:class:`~scrapy.spiders.CrawlSpider`, as its purpose is very simple: to
extract links.
The ``__init__`` method of
:class:`~scrapy.linkextractors.lxmlhtml.LxmlLinkExtractor` takes settings that
determine which links may be extracted. :class:`LxmlLinkExtractor.extract_links
<scrapy.linkextractors.lxmlhtml.LxmlLinkExtractor.extract_links>` returns a
list of matching :class:`scrapy.link.Link` objects from a
:class:`~scrapy.http.Response` object.
Link extractors are used in :class:`~scrapy.spiders.CrawlSpider` spiders
through a set of :class:`~scrapy.spiders.Rule` objects. You can also use link
extractors in regular spiders.
.. _topics-link-extractors-ref:
Built-in link extractors reference
==================================
Link extractor reference
========================
.. module:: scrapy.linkextractors
:synopsis: Link extractors classes
Link extractors classes bundled with Scrapy are provided in the
:mod:`scrapy.linkextractors` module.
The default link extractor is ``LinkExtractor``, which is the same as
:class:`~.LxmlLinkExtractor`::
The link extractor class is
:class:`scrapy.linkextractors.lxmlhtml.LxmlLinkExtractor`. For convenience it
can also be imported as ``scrapy.linkextractors.LinkExtractor``::
from scrapy.linkextractors import LinkExtractor
There used to be other link extractor classes in previous Scrapy versions,
but they are deprecated now.
LxmlLinkExtractor
-----------------
@ -62,7 +49,7 @@ LxmlLinkExtractor
:type allow: a regular expression (or list of)
:param deny: a single regular expression (or list of regular expressions)
that the (absolute) urls must match in order to be excluded (ie. not
that the (absolute) urls must match in order to be excluded (i.e. not
extracted). It has precedence over the ``allow`` parameter. If not
given (or empty) it won't exclude any links.
:type deny: a regular expression (or list of)
@ -77,9 +64,13 @@ LxmlLinkExtractor
:param deny_extensions: a single value or list of strings containing
extensions that should be ignored when extracting links.
If not given, it will default to the
``IGNORED_EXTENSIONS`` list defined in the
`scrapy.linkextractors`_ package.
If not given, it will default to
:data:`scrapy.linkextractors.IGNORED_EXTENSIONS`.
.. versionchanged:: 2.0
:data:`~scrapy.linkextractors.IGNORED_EXTENSIONS` now includes
``7z``, ``7zip``, ``apk``, ``bz2``, ``cdr``, ``dmg``, ``ico``,
``iso``, ``tar``, ``tar.gz``, ``webm``, and ``xz``.
:type deny_extensions: list
:param restrict_xpaths: is an XPath (or list of XPath's) which defines
@ -152,4 +143,6 @@ LxmlLinkExtractor
from elements or attributes which allow leading/trailing whitespaces).
:type strip: boolean
.. automethod:: extract_links
.. _scrapy.linkextractors: https://github.com/scrapy/scrapy/blob/master/scrapy/linkextractors/__init__.py

117
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@ -136,6 +136,9 @@ with the data to be parsed, and return a parsed value. So you can use any
function as input or output processor. The only requirement is that they must
accept one (and only one) positional argument, which will be an iterable.
.. versionchanged:: 2.0
Processors no longer need to be methods.
.. note:: Both input and output processors must receive an iterable as their
first argument. The output of those functions can be anything. The result of
input processors will be appended to an internal list (in the Loader)
@ -206,14 +209,12 @@ metadata. Here is an example::
output_processor=TakeFirst(),
)
::
>>> from scrapy.loader import ItemLoader
>>> il = ItemLoader(item=Product())
>>> il.add_value('name', [u'Welcome to my', u'<strong>website</strong>'])
>>> il.add_value('price', [u'&euro;', u'<span>1000</span>'])
>>> il.load_item()
{'name': u'Welcome to my website', 'price': u'1000'}
>>> from scrapy.loader import ItemLoader
>>> il = ItemLoader(item=Product())
>>> il.add_value('name', [u'Welcome to my', u'<strong>website</strong>'])
>>> il.add_value('price', [u'&euro;', u'<span>1000</span>'])
>>> il.load_item()
{'name': u'Welcome to my website', 'price': u'1000'}
The precedence order, for both input and output processors, is as follows:
@ -314,11 +315,11 @@ ItemLoader objects
applied before processors
:type re: str or compiled regex
Examples::
Examples:
>>> from scrapy.loader.processors import TakeFirst
>>> loader.get_value(u'name: foo', TakeFirst(), unicode.upper, re='name: (.+)')
'FOO`
>>> from scrapy.loader.processors import TakeFirst
>>> loader.get_value(u'name: foo', TakeFirst(), unicode.upper, re='name: (.+)')
'FOO`
.. method:: add_value(field_name, value, \*processors, \**kwargs)
@ -639,12 +640,12 @@ Here is a list of all built-in processors:
values unchanged. It doesn't receive any ``__init__`` method arguments, nor does it
accept Loader contexts.
Example::
Example:
>>> from scrapy.loader.processors import Identity
>>> proc = Identity()
>>> proc(['one', 'two', 'three'])
['one', 'two', 'three']
>>> from scrapy.loader.processors import Identity
>>> proc = Identity()
>>> proc(['one', 'two', 'three'])
['one', 'two', 'three']
.. class:: TakeFirst
@ -652,12 +653,12 @@ Here is a list of all built-in processors:
so it's typically used as an output processor to single-valued fields.
It doesn't receive any ``__init__`` method arguments, nor does it accept Loader contexts.
Example::
Example:
>>> from scrapy.loader.processors import TakeFirst
>>> proc = TakeFirst()
>>> proc(['', 'one', 'two', 'three'])
'one'
>>> from scrapy.loader.processors import TakeFirst
>>> proc = TakeFirst()
>>> proc(['', 'one', 'two', 'three'])
'one'
.. class:: Join(separator=u' ')
@ -667,15 +668,15 @@ Here is a list of all built-in processors:
When using the default separator, this processor is equivalent to the
function: ``u' '.join``
Examples::
Examples:
>>> from scrapy.loader.processors import Join
>>> proc = Join()
>>> proc(['one', 'two', 'three'])
'one two three'
>>> proc = Join('<br>')
>>> proc(['one', 'two', 'three'])
'one<br>two<br>three'
>>> from scrapy.loader.processors import Join
>>> proc = Join()
>>> proc(['one', 'two', 'three'])
'one two three'
>>> proc = Join('<br>')
>>> proc(['one', 'two', 'three'])
'one<br>two<br>three'
.. class:: Compose(\*functions, \**default_loader_context)
@ -688,12 +689,12 @@ Here is a list of all built-in processors:
By default, stop process on ``None`` value. This behaviour can be changed by
passing keyword argument ``stop_on_none=False``.
Example::
Example:
>>> from scrapy.loader.processors import Compose
>>> proc = Compose(lambda v: v[0], str.upper)
>>> proc(['hello', 'world'])
'HELLO'
>>> from scrapy.loader.processors import Compose
>>> proc = Compose(lambda v: v[0], str.upper)
>>> proc(['hello', 'world'])
'HELLO'
Each function can optionally receive a ``loader_context`` parameter. For
those which do, this processor will pass the currently active :ref:`Loader
@ -732,15 +733,15 @@ Here is a list of all built-in processors:
:meth:`~scrapy.selector.Selector.extract` method of :ref:`selectors
<topics-selectors>`, which returns a list of unicode strings.
The example below should clarify how it works::
The example below should clarify how it works:
>>> def filter_world(x):
... return None if x == 'world' else x
...
>>> from scrapy.loader.processors import MapCompose
>>> proc = MapCompose(filter_world, str.upper)
>>> proc(['hello', 'world', 'this', 'is', 'scrapy'])
['HELLO, 'THIS', 'IS', 'SCRAPY']
>>> def filter_world(x):
... return None if x == 'world' else x
...
>>> from scrapy.loader.processors import MapCompose
>>> proc = MapCompose(filter_world, str.upper)
>>> proc(['hello', 'world', 'this', 'is', 'scrapy'])
['HELLO, 'THIS', 'IS', 'SCRAPY']
As with the Compose processor, functions can receive Loader contexts, and
``__init__`` method keyword arguments are used as default context values. See
@ -752,21 +753,21 @@ Here is a list of all built-in processors:
Requires jmespath (https://github.com/jmespath/jmespath.py) to run.
This processor takes only one input at a time.
Example::
Example:
>>> from scrapy.loader.processors import SelectJmes, Compose, MapCompose
>>> proc = SelectJmes("foo") #for direct use on lists and dictionaries
>>> proc({'foo': 'bar'})
'bar'
>>> proc({'foo': {'bar': 'baz'}})
{'bar': 'baz'}
>>> from scrapy.loader.processors import SelectJmes, Compose, MapCompose
>>> proc = SelectJmes("foo") #for direct use on lists and dictionaries
>>> proc({'foo': 'bar'})
'bar'
>>> proc({'foo': {'bar': 'baz'}})
{'bar': 'baz'}
Working with Json::
Working with Json:
>>> import json
>>> proc_single_json_str = Compose(json.loads, SelectJmes("foo"))
>>> proc_single_json_str('{"foo": "bar"}')
'bar'
>>> proc_json_list = Compose(json.loads, MapCompose(SelectJmes('foo')))
>>> proc_json_list('[{"foo":"bar"}, {"baz":"tar"}]')
['bar']
>>> import json
>>> proc_single_json_str = Compose(json.loads, SelectJmes("foo"))
>>> proc_single_json_str('{"foo": "bar"}')
'bar'
>>> proc_json_list = Compose(json.loads, MapCompose(SelectJmes('foo')))
>>> proc_json_list('[{"foo":"bar"}, {"baz":"tar"}]')
['bar']

31
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@ -9,8 +9,7 @@ Logging
explicit calls to the Python standard logging. Keep reading to learn more
about the new logging system.
Scrapy uses `Python's builtin logging system
<https://docs.python.org/3/library/logging.html>`_ for event logging. We'll
Scrapy uses :mod:`logging` for event logging. We'll
provide some simple examples to get you started, but for more advanced
use-cases it's strongly suggested to read thoroughly its documentation.
@ -83,10 +82,10 @@ path::
.. seealso::
Module logging, `HowTo <https://docs.python.org/2/howto/logging.html>`_
Module logging, :doc:`HowTo <howto/logging>`
Basic Logging Tutorial
Module logging, `Loggers <https://docs.python.org/2/library/logging.html#logger-objects>`_
Module logging, :ref:`Loggers <logger>`
Further documentation on loggers
.. _topics-logging-from-spiders:
@ -165,15 +164,13 @@ possible levels listed in :ref:`topics-logging-levels`.
:setting:`LOG_FORMAT` and :setting:`LOG_DATEFORMAT` specify formatting strings
used as layouts for all messages. Those strings can contain any placeholders
listed in `logging's logrecord attributes docs
<https://docs.python.org/2/library/logging.html#logrecord-attributes>`_ and
`datetime's strftime and strptime directives
<https://docs.python.org/2/library/datetime.html#strftime-and-strptime-behavior>`_
listed in :ref:`logging's logrecord attributes docs <logrecord-attributes>` and
:ref:`datetime's strftime and strptime directives <strftime-strptime-behavior>`
respectively.
If :setting:`LOG_SHORT_NAMES` is set, then the logs will not display the scrapy
component that prints the log. It is unset by default, hence logs contain the
scrapy component responsible for that log output.
If :setting:`LOG_SHORT_NAMES` is set, then the logs will not display the Scrapy
component that prints the log. It is unset by default, hence logs contain the
Scrapy component responsible for that log output.
Command-line options
--------------------
@ -190,7 +187,7 @@ to override some of the Scrapy settings regarding logging.
.. seealso::
Module `logging.handlers <https://docs.python.org/2/library/logging.handlers.html>`_
Module :mod:`logging.handlers`
Further documentation on available handlers
.. _custom-log-formats:
@ -201,7 +198,7 @@ Custom Log Formats
A custom log format can be set for different actions by extending
:class:`~scrapy.logformatter.LogFormatter` class and making
:setting:`LOG_FORMATTER` point to your new class.
.. autoclass:: scrapy.logformatter.LogFormatter
:members:
@ -256,10 +253,10 @@ scrapy.utils.log module
In that case, its usage is not required but it's recommended.
Another option when running custom scripts is to manually configure the logging.
To do this you can use `logging.basicConfig()`_ to set a basic root handler.
To do this you can use :func:`logging.basicConfig` to set a basic root handler.
Note that :class:`~scrapy.crawler.CrawlerProcess` automatically calls ``configure_logging``,
so it is recommended to only use `logging.basicConfig()`_ together with
so it is recommended to only use :func:`logging.basicConfig` together with
:class:`~scrapy.crawler.CrawlerRunner`.
This is an example on how to redirect ``INFO`` or higher messages to a file::
@ -275,7 +272,3 @@ scrapy.utils.log module
Refer to :ref:`run-from-script` for more details about using Scrapy this
way.
.. _logging.basicConfig(): https://docs.python.org/2/library/logging.html#logging.basicConfig

50
docs/topics/media-pipeline.rst
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@ -97,7 +97,6 @@ For Files Pipeline, use::
ITEM_PIPELINES = {'scrapy.pipelines.files.FilesPipeline': 1}
.. note::
You can also use both the Files and Images Pipeline at the same time.
@ -117,12 +116,6 @@ For the Images Pipeline, set the :setting:`IMAGES_STORE` setting::
Supported Storage
=================
File system is currently the only officially supported storage, but there are
also support for storing files in `Amazon S3`_ and `Google Cloud Storage`_.
.. _Amazon S3: https://aws.amazon.com/s3/
.. _Google Cloud Storage: https://cloud.google.com/storage/
File system storage
-------------------
@ -148,6 +141,29 @@ Where:
* ``full`` is a sub-directory to separate full images from thumbnails (if
used). For more info see :ref:`topics-images-thumbnails`.
.. _media-pipeline-ftp:
FTP server storage
------------------
.. versionadded:: 2.0
:setting:`FILES_STORE` and :setting:`IMAGES_STORE` can point to an FTP server.
Scrapy will automatically upload the files to the server.
:setting:`FILES_STORE` and :setting:`IMAGES_STORE` should be written in one of the
following forms::
ftp://username:password@address:port/path
ftp://address:port/path
If ``username`` and ``password`` are not provided, they are taken from the :setting:`FTP_USER` and
:setting:`FTP_PASSWORD` settings respectively.
FTP supports two different connection modes: active or passive. Scrapy uses
the passive connection mode by default. To use the active connection mode instead,
set the :setting:`FEED_STORAGE_FTP_ACTIVE` setting to ``True``.
Amazon S3 storage
-----------------
@ -392,7 +408,7 @@ See here the methods that you can override in your custom Files Pipeline:
.. class:: FilesPipeline
.. method:: file_path(request, response, info)
.. method:: file_path(self, request, response=None, info=None)
This method is called once per downloaded item. It returns the
download path of the file originating from the specified
@ -416,7 +432,7 @@ See here the methods that you can override in your custom Files Pipeline:
class MyFilesPipeline(FilesPipeline):
def file_path(self, request, response, info):
def file_path(self, request, response=None, info=None):
return 'files/' + os.path.basename(urlparse(request.url).path)
By default the :meth:`file_path` method returns
@ -506,7 +522,7 @@ See here the methods that you can override in your custom Images Pipeline:
The :class:`ImagesPipeline` is an extension of the :class:`FilesPipeline`,
customizing the field names and adding custom behavior for images.
.. method:: file_path(request, response, info)
.. method:: file_path(self, request, response=None, info=None)
This method is called once per downloaded item. It returns the
download path of the file originating from the specified
@ -530,7 +546,7 @@ See here the methods that you can override in your custom Images Pipeline:
class MyImagesPipeline(ImagesPipeline):
def file_path(self, request, response, info):
def file_path(self, request, response=None, info=None):
return 'files/' + os.path.basename(urlparse(request.url).path)
By default the :meth:`file_path` method returns
@ -555,10 +571,12 @@ See here the methods that you can override in your custom Images Pipeline:
By default, the :meth:`item_completed` method returns the item.
.. _media-pipeline-example:
Custom Images pipeline example
==============================
Here is a full example of the Images Pipeline whose methods are examplified
Here is a full example of the Images Pipeline whose methods are exemplified
above::
import scrapy
@ -578,4 +596,12 @@ above::
item['image_paths'] = image_paths
return item
To enable your custom media pipeline component you must add its class import path to the
:setting:`ITEM_PIPELINES` setting, like in the following example::
ITEM_PIPELINES = {
'myproject.pipelines.MyImagesPipeline': 300
}
.. _MD5 hash: https://en.wikipedia.org/wiki/MD5

5
docs/topics/practices.rst
View File

@ -35,8 +35,9 @@ Here's an example showing how to run a single spider with it.
...
process = CrawlerProcess(settings={
'FEED_FORMAT': 'json',
'FEED_URI': 'items.json'
"FEEDS": {
"items.json": {"format": "json"},
},
})
process.crawl(MySpider)

82
docs/topics/request-response.rst
View File

@ -31,10 +31,12 @@ Request objects
a :class:`Response`.
:param url: the URL of this request
If the URL is invalid, a :exc:`ValueError` exception is raised.
:type url: string
:param callback: the function that will be called with the response of this
request (once its downloaded) as its first parameter. For more information
request (once it's downloaded) as its first parameter. For more information
see :ref:`topics-request-response-ref-request-callback-arguments` below.
If a Request doesn't specify a callback, the spider's
:meth:`~scrapy.spiders.Spider.parse` method will be used.
@ -125,6 +127,10 @@ Request objects
:exc:`~twisted.python.failure.Failure` as first parameter.
For more information,
see :ref:`topics-request-response-ref-errbacks` below.
.. versionchanged:: 2.0
The *callback* parameter is no longer required when the *errback*
parameter is specified.
:type errback: callable
:param flags: Flags sent to the request, can be used for logging or similar purposes.
@ -168,9 +174,9 @@ Request objects
See :ref:`topics-request-meta` for a list of special meta keys
recognized by Scrapy.
This dict is `shallow copied`_ when the request is cloned using the
``copy()`` or ``replace()`` methods, and can also be accessed, in your
spider, from the ``response.meta`` attribute.
This dict is :doc:`shallow copied <library/copy>` when the request is
cloned using the ``copy()`` or ``replace()`` methods, and can also be
accessed, in your spider, from the ``response.meta`` attribute.
.. attribute:: Request.cb_kwargs
@ -179,11 +185,9 @@ Request objects
for new Requests, which means by default callbacks only get a :class:`Response`
object as argument.
This dict is `shallow copied`_ when the request is cloned using the
``copy()`` or ``replace()`` methods, and can also be accessed, in your
spider, from the ``response.cb_kwargs`` attribute.
.. _shallow copied: https://docs.python.org/2/library/copy.html
This dict is :doc:`shallow copied <library/copy>` when the request is
cloned using the ``copy()`` or ``replace()`` methods, and can also be
accessed, in your spider, from the ``response.cb_kwargs`` attribute.
.. method:: Request.copy()
@ -396,7 +400,7 @@ The FormRequest class extends the base :class:`Request` with functionality for
dealing with HTML forms. It uses `lxml.html forms`_ to pre-populate form
fields with form data from :class:`Response` objects.
.. _lxml.html forms: http://lxml.de/lxmlhtml.html#forms
.. _lxml.html forms: https://lxml.de/lxmlhtml.html#forms
.. class:: FormRequest(url, [formdata, ...])
@ -560,12 +564,10 @@ dealing with JSON requests.
set to ``'POST'`` automatically.
:type data: JSON serializable object
:param dumps_kwargs: Parameters that will be passed to underlying `json.dumps`_ method which is used to serialize
:param dumps_kwargs: Parameters that will be passed to underlying :func:`json.dumps` method which is used to serialize
data into JSON format.
:type dumps_kwargs: dict
.. _json.dumps: https://docs.python.org/3/library/json.html#json.dumps
JsonRequest usage example
-------------------------
@ -609,7 +611,16 @@ Response objects
:param request: the initial value of the :attr:`Response.request` attribute.
This represents the :class:`Request` that generated this response.
:type request: :class:`Request` object
:type request: scrapy.http.Request
:param certificate: an object representing the server's SSL certificate.
:type certificate: twisted.internet.ssl.Certificate
:param ip_address: The IP address of the server from which the Response originated.
:type ip_address: :class:`ipaddress.IPv4Address` or :class:`ipaddress.IPv6Address`
.. versionadded:: 2.1.0
The ``ip_address`` parameter.
.. attribute:: Response.url
@ -664,7 +675,7 @@ Response objects
.. attribute:: Response.meta
A shortcut to the :attr:`Request.meta` attribute of the
:attr:`Response.request` object (ie. ``self.request.meta``).
:attr:`Response.request` object (i.e. ``self.request.meta``).
Unlike the :attr:`Response.request` attribute, the :attr:`Response.meta`
attribute is propagated along redirects and retries, so you will get
@ -672,6 +683,20 @@ Response objects
.. seealso:: :attr:`Request.meta` attribute
.. attribute:: Response.cb_kwargs
.. versionadded:: 2.0
A shortcut to the :attr:`Request.cb_kwargs` attribute of the
:attr:`Response.request` object (i.e. ``self.request.cb_kwargs``).
Unlike the :attr:`Response.request` attribute, the
:attr:`Response.cb_kwargs` attribute is propagated along redirects and
retries, so you will get the original :attr:`Request.cb_kwargs` sent
from your spider.
.. seealso:: :attr:`Request.cb_kwargs` attribute
.. attribute:: Response.flags
A list that contains flags for this response. Flags are labels used for
@ -679,6 +704,23 @@ Response objects
they're shown on the string representation of the Response (`__str__`
method) which is used by the engine for logging.
.. attribute:: Response.certificate
A :class:`twisted.internet.ssl.Certificate` object representing
the server's SSL certificate.
Only populated for ``https`` responses, ``None`` otherwise.
.. attribute:: Response.ip_address
.. versionadded:: 2.1.0
The IP address of the server from which the Response originated.
This attribute is currently only populated by the HTTP 1.1 download
handler, i.e. for ``http(s)`` responses. For other handlers,
:attr:`ip_address` is always ``None``.
.. method:: Response.copy()
Returns a new Response which is a copy of this Response.
@ -694,15 +736,15 @@ Response objects
Constructs an absolute url by combining the Response's :attr:`url` with
a possible relative url.
This is a wrapper over `urlparse.urljoin`_, it's merely an alias for
This is a wrapper over :func:`~urllib.parse.urljoin`, it's merely an alias for
making this call::
urlparse.urljoin(response.url, url)
urllib.parse.urljoin(response.url, url)
.. automethod:: Response.follow
.. automethod:: Response.follow_all
.. _urlparse.urljoin: https://docs.python.org/2/library/urlparse.html#urlparse.urljoin
.. _topics-request-response-ref-response-subclasses:
@ -758,7 +800,7 @@ TextResponse objects
1. the encoding passed in the ``__init__`` method ``encoding`` argument
2. the encoding declared in the Content-Type HTTP header. If this
encoding is not valid (ie. unknown), it is ignored and the next
encoding is not valid (i.e. unknown), it is ignored and the next
resolution mechanism is tried.
3. the encoding declared in the response body. The TextResponse class
@ -790,6 +832,8 @@ TextResponse objects
.. automethod:: TextResponse.follow
.. automethod:: TextResponse.follow_all
.. method:: TextResponse.body_as_unicode()
The same as :attr:`text`, but available as a method. This method is

589
docs/topics/selectors.rst
View File

@ -14,7 +14,7 @@ achieve this, such as:
drawback: it's slow.
* `lxml`_ is an XML parsing library (which also parses HTML) with a pythonic
API based on `ElementTree`_. (lxml is not part of the Python standard
API based on :mod:`~xml.etree.ElementTree`. (lxml is not part of the Python standard
library.)
Scrapy comes with its own mechanism for extracting data. They're called
@ -35,12 +35,10 @@ defines selectors to associate those styles with specific HTML elements.
in speed and parsing accuracy to lxml.
.. _BeautifulSoup: https://www.crummy.com/software/BeautifulSoup/
.. _lxml: http://lxml.de/
.. _ElementTree: https://docs.python.org/2/library/xml.etree.elementtree.html
.. _cssselect: https://pypi.python.org/pypi/cssselect/
.. _XPath: https://www.w3.org/TR/xpath
.. _lxml: https://lxml.de/
.. _XPath: https://www.w3.org/TR/xpath/all/
.. _CSS: https://www.w3.org/TR/selectors
.. _parsel: https://parsel.readthedocs.io/
.. _parsel: https://parsel.readthedocs.io/en/latest/
Using selectors
===============
@ -51,18 +49,18 @@ Constructing selectors
.. highlight:: python
Response objects expose a :class:`~scrapy.selector.Selector` instance
on ``.selector`` attribute::
on ``.selector`` attribute:
>>> response.selector.xpath('//span/text()').get()
'good'
>>> response.selector.xpath('//span/text()').get()
'good'
Querying responses using XPath and CSS is so common that responses include two
more shortcuts: ``response.xpath()`` and ``response.css()``::
more shortcuts: ``response.xpath()`` and ``response.css()``:
>>> response.xpath('//span/text()').get()
'good'
>>> response.css('span::text').get()
'good'
>>> response.xpath('//span/text()').get()
'good'
>>> response.css('span::text').get()
'good'
Scrapy selectors are instances of :class:`~scrapy.selector.Selector` class
constructed by passing either :class:`~scrapy.http.TextResponse` object or
@ -74,21 +72,21 @@ shortcuts. By using ``response.selector`` or one of these shortcuts
you can also ensure the response body is parsed only once.
But if required, it is possible to use ``Selector`` directly.
Constructing from text::
Constructing from text:
>>> from scrapy.selector import Selector
>>> body = '<html><body><span>good</span></body></html>'
>>> Selector(text=body).xpath('//span/text()').get()
'good'
>>> from scrapy.selector import Selector
>>> body = '<html><body><span>good</span></body></html>'
>>> Selector(text=body).xpath('//span/text()').get()
'good'
Constructing from response - :class:`~scrapy.http.HtmlResponse` is one of
:class:`~scrapy.http.TextResponse` subclasses::
:class:`~scrapy.http.TextResponse` subclasses:
>>> from scrapy.selector import Selector
>>> from scrapy.http import HtmlResponse
>>> response = HtmlResponse(url='http://example.com', body=body)
>>> Selector(response=response).xpath('//span/text()').get()
'good'
>>> from scrapy.selector import Selector
>>> from scrapy.http import HtmlResponse
>>> response = HtmlResponse(url='http://example.com', body=body)
>>> Selector(response=response).xpath('//span/text()').get()
'good'
``Selector`` automatically chooses the best parsing rules
(XML vs HTML) based on input type.
@ -123,118 +121,118 @@ Since we're dealing with HTML, the selector will automatically use an HTML parse
.. highlight:: python
So, by looking at the :ref:`HTML code <topics-selectors-htmlcode>` of that
page, let's construct an XPath for selecting the text inside the title tag::
page, let's construct an XPath for selecting the text inside the title tag:
>>> response.xpath('//title/text()')
[<Selector xpath='//title/text()' data='Example website'>]
>>> response.xpath('//title/text()')
[<Selector xpath='//title/text()' data='Example website'>]
To actually extract the textual data, you must call the selector ``.get()``
or ``.getall()`` methods, as follows::
or ``.getall()`` methods, as follows:
>>> response.xpath('//title/text()').getall()
['Example website']
>>> response.xpath('//title/text()').get()
'Example website'
>>> response.xpath('//title/text()').getall()
['Example website']
>>> response.xpath('//title/text()').get()
'Example website'
``.get()`` always returns a single result; if there are several matches,
content of a first match is returned; if there are no matches, None
is returned. ``.getall()`` returns a list with all results.
Notice that CSS selectors can select text or attribute nodes using CSS3
pseudo-elements::
pseudo-elements:
>>> response.css('title::text').get()
'Example website'
>>> response.css('title::text').get()
'Example website'
As you can see, ``.xpath()`` and ``.css()`` methods return a
:class:`~scrapy.selector.SelectorList` instance, which is a list of new
selectors. This API can be used for quickly selecting nested data::
selectors. This API can be used for quickly selecting nested data:
>>> response.css('img').xpath('@src').getall()
['image1_thumb.jpg',
'image2_thumb.jpg',
'image3_thumb.jpg',
'image4_thumb.jpg',
'image5_thumb.jpg']
>>> response.css('img').xpath('@src').getall()
['image1_thumb.jpg',
'image2_thumb.jpg',
'image3_thumb.jpg',
'image4_thumb.jpg',
'image5_thumb.jpg']
If you want to extract only the first matched element, you can call the
selector ``.get()`` (or its alias ``.extract_first()`` commonly used in
previous Scrapy versions)::
previous Scrapy versions):
>>> response.xpath('//div[@id="images"]/a/text()').get()
'Name: My image 1 '
>>> response.xpath('//div[@id="images"]/a/text()').get()
'Name: My image 1 '
It returns ``None`` if no element was found::
It returns ``None`` if no element was found:
>>> response.xpath('//div[@id="not-exists"]/text()').get() is None
True
>>> response.xpath('//div[@id="not-exists"]/text()').get() is None
True
A default return value can be provided as an argument, to be used instead
of ``None``:
>>> response.xpath('//div[@id="not-exists"]/text()').get(default='not-found')
'not-found'
>>> response.xpath('//div[@id="not-exists"]/text()').get(default='not-found')
'not-found'
Instead of using e.g. ``'@src'`` XPath it is possible to query for attributes
using ``.attrib`` property of a :class:`~scrapy.selector.Selector`::
using ``.attrib`` property of a :class:`~scrapy.selector.Selector`:
>>> [img.attrib['src'] for img in response.css('img')]
['image1_thumb.jpg',
'image2_thumb.jpg',
'image3_thumb.jpg',
'image4_thumb.jpg',
'image5_thumb.jpg']
>>> [img.attrib['src'] for img in response.css('img')]
['image1_thumb.jpg',
'image2_thumb.jpg',
'image3_thumb.jpg',
'image4_thumb.jpg',
'image5_thumb.jpg']
As a shortcut, ``.attrib`` is also available on SelectorList directly;
it returns attributes for the first matching element::
it returns attributes for the first matching element:
>>> response.css('img').attrib['src']
'image1_thumb.jpg'
>>> response.css('img').attrib['src']
'image1_thumb.jpg'
This is most useful when only a single result is expected, e.g. when selecting
by id, or selecting unique elements on a web page::
by id, or selecting unique elements on a web page:
>>> response.css('base').attrib['href']
'http://example.com/'
>>> response.css('base').attrib['href']
'http://example.com/'
Now we're going to get the base URL and some image links::
Now we're going to get the base URL and some image links:
>>> response.xpath('//base/@href').get()
'http://example.com/'
>>> response.xpath('//base/@href').get()
'http://example.com/'
>>> response.css('base::attr(href)').get()
'http://example.com/'
>>> response.css('base::attr(href)').get()
'http://example.com/'
>>> response.css('base').attrib['href']
'http://example.com/'
>>> response.css('base').attrib['href']
'http://example.com/'
>>> response.xpath('//a[contains(@href, "image")]/@href').getall()
['image1.html',
'image2.html',
'image3.html',
'image4.html',
'image5.html']
>>> response.xpath('//a[contains(@href, "image")]/@href').getall()
['image1.html',
'image2.html',
'image3.html',
'image4.html',
'image5.html']
>>> response.css('a[href*=image]::attr(href)').getall()
['image1.html',
'image2.html',
'image3.html',
'image4.html',
'image5.html']
>>> response.css('a[href*=image]::attr(href)').getall()
['image1.html',
'image2.html',
'image3.html',
'image4.html',
'image5.html']
>>> response.xpath('//a[contains(@href, "image")]/img/@src').getall()
['image1_thumb.jpg',
'image2_thumb.jpg',
'image3_thumb.jpg',
'image4_thumb.jpg',
'image5_thumb.jpg']
>>> response.xpath('//a[contains(@href, "image")]/img/@src').getall()
['image1_thumb.jpg',
'image2_thumb.jpg',
'image3_thumb.jpg',
'image4_thumb.jpg',
'image5_thumb.jpg']
>>> response.css('a[href*=image] img::attr(src)').getall()
['image1_thumb.jpg',
'image2_thumb.jpg',
'image3_thumb.jpg',
'image4_thumb.jpg',
'image5_thumb.jpg']
>>> response.css('a[href*=image] img::attr(src)').getall()
['image1_thumb.jpg',
'image2_thumb.jpg',
'image3_thumb.jpg',
'image4_thumb.jpg',
'image5_thumb.jpg']
.. _topics-selectors-css-extensions:
@ -255,51 +253,51 @@ that Scrapy (parsel) implements a couple of **non-standard pseudo-elements**:
They will most probably not work with other libraries like
`lxml`_ or `PyQuery`_.
.. _PyQuery: https://pypi.python.org/pypi/pyquery
.. _PyQuery: https://pypi.org/project/pyquery/
Examples:
* ``title::text`` selects children text nodes of a descendant ``<title>`` element::
* ``title::text`` selects children text nodes of a descendant ``<title>`` element:
>>> response.css('title::text').get()
'Example website'
>>> response.css('title::text').get()
'Example website'
* ``*::text`` selects all descendant text nodes of the current selector context::
* ``*::text`` selects all descendant text nodes of the current selector context:
>>> response.css('#images *::text').getall()
['\n ',
'Name: My image 1 ',
'\n ',
'Name: My image 2 ',
'\n ',
'Name: My image 3 ',
'\n ',
'Name: My image 4 ',
'\n ',
'Name: My image 5 ',
'\n ']
>>> response.css('#images *::text').getall()
['\n ',
'Name: My image 1 ',
'\n ',
'Name: My image 2 ',
'\n ',
'Name: My image 3 ',
'\n ',
'Name: My image 4 ',
'\n ',
'Name: My image 5 ',
'\n ']
* ``foo::text`` returns no results if ``foo`` element exists, but contains
no text (i.e. text is empty)::
no text (i.e. text is empty):
>>> response.css('img::text').getall()
[]
>>> response.css('img::text').getall()
[]
This means ``.css('foo::text').get()`` could return None even if an element
exists. Use ``default=''`` if you always want a string::
exists. Use ``default=''`` if you always want a string:
>>> response.css('img::text').get()
>>> response.css('img::text').get(default='')
''
>>> response.css('img::text').get()
>>> response.css('img::text').get(default='')
''
* ``a::attr(href)`` selects the *href* attribute value of descendant links::
* ``a::attr(href)`` selects the *href* attribute value of descendant links:
>>> response.css('a::attr(href)').getall()
['image1.html',
'image2.html',
'image3.html',
'image4.html',
'image5.html']
>>> response.css('a::attr(href)').getall()
['image1.html',
'image2.html',
'image3.html',
'image4.html',
'image5.html']
.. note::
See also: :ref:`selecting-attributes`.
@ -309,7 +307,7 @@ Examples:
make much sense: text nodes do not have attributes, and attribute values
are string values already and do not have children nodes.
.. _CSS Selectors: https://www.w3.org/TR/css3-selectors/#selectors
.. _CSS Selectors: https://www.w3.org/TR/selectors-3/#selectors
.. _topics-selectors-nesting-selectors:
@ -318,25 +316,24 @@ Nesting selectors
The selection methods (``.xpath()`` or ``.css()``) return a list of selectors
of the same type, so you can call the selection methods for those selectors
too. Here's an example::
too. Here's an example:
>>> links = response.xpath('//a[contains(@href, "image")]')
>>> links.getall()
['<a href="image1.html">Name: My image 1 <br><img src="image1_thumb.jpg"></a>',
'<a href="image2.html">Name: My image 2 <br><img src="image2_thumb.jpg"></a>',
'<a href="image3.html">Name: My image 3 <br><img src="image3_thumb.jpg"></a>',
'<a href="image4.html">Name: My image 4 <br><img src="image4_thumb.jpg"></a>',
'<a href="image5.html">Name: My image 5 <br><img src="image5_thumb.jpg"></a>']
>>> links = response.xpath('//a[contains(@href, "image")]')
>>> links.getall()
['<a href="image1.html">Name: My image 1 <br><img src="image1_thumb.jpg"></a>',
'<a href="image2.html">Name: My image 2 <br><img src="image2_thumb.jpg"></a>',
'<a href="image3.html">Name: My image 3 <br><img src="image3_thumb.jpg"></a>',
'<a href="image4.html">Name: My image 4 <br><img src="image4_thumb.jpg"></a>',
'<a href="image5.html">Name: My image 5 <br><img src="image5_thumb.jpg"></a>']
>>> for index, link in enumerate(links):
... args = (index, link.xpath('@href').get(), link.xpath('img/@src').get())
... print('Link number %d points to url %r and image %r' % args)
Link number 0 points to url 'image1.html' and image 'image1_thumb.jpg'
Link number 1 points to url 'image2.html' and image 'image2_thumb.jpg'
Link number 2 points to url 'image3.html' and image 'image3_thumb.jpg'
Link number 3 points to url 'image4.html' and image 'image4_thumb.jpg'
Link number 4 points to url 'image5.html' and image 'image5_thumb.jpg'
>>> for index, link in enumerate(links):
... args = (index, link.xpath('@href').get(), link.xpath('img/@src').get())
... print('Link number %d points to url %r and image %r' % args)
Link number 0 points to url 'image1.html' and image 'image1_thumb.jpg'
Link number 1 points to url 'image2.html' and image 'image2_thumb.jpg'
Link number 2 points to url 'image3.html' and image 'image3_thumb.jpg'
Link number 3 points to url 'image4.html' and image 'image4_thumb.jpg'
Link number 4 points to url 'image5.html' and image 'image5_thumb.jpg'
.. _selecting-attributes:
@ -344,42 +341,42 @@ Selecting element attributes
----------------------------
There are several ways to get a value of an attribute. First, one can use
XPath syntax::
XPath syntax:
>>> response.xpath("//a/@href").getall()
['image1.html', 'image2.html', 'image3.html', 'image4.html', 'image5.html']
>>> response.xpath("//a/@href").getall()
['image1.html', 'image2.html', 'image3.html', 'image4.html', 'image5.html']
XPath syntax has a few advantages: it is a standard XPath feature, and
``@attributes`` can be used in other parts of an XPath expression - e.g.
it is possible to filter by attribute value.
Scrapy also provides an extension to CSS selectors (``::attr(...)``)
which allows to get attribute values::
which allows to get attribute values:
>>> response.css('a::attr(href)').getall()
['image1.html', 'image2.html', 'image3.html', 'image4.html', 'image5.html']
>>> response.css('a::attr(href)').getall()
['image1.html', 'image2.html', 'image3.html', 'image4.html', 'image5.html']
In addition to that, there is a ``.attrib`` property of Selector.
You can use it if you prefer to lookup attributes in Python
code, without using XPaths or CSS extensions::
code, without using XPaths or CSS extensions:
>>> [a.attrib['href'] for a in response.css('a')]
['image1.html', 'image2.html', 'image3.html', 'image4.html', 'image5.html']
>>> [a.attrib['href'] for a in response.css('a')]
['image1.html', 'image2.html', 'image3.html', 'image4.html', 'image5.html']
This property is also available on SelectorList; it returns a dictionary
with attributes of a first matching element. It is convenient to use when
a selector is expected to give a single result (e.g. when selecting by element
ID, or when selecting an unique element on a page)::
ID, or when selecting an unique element on a page):
>>> response.css('base').attrib
{'href': 'http://example.com/'}
>>> response.css('base').attrib['href']
'http://example.com/'
>>> response.css('base').attrib
{'href': 'http://example.com/'}
>>> response.css('base').attrib['href']
'http://example.com/'
``.attrib`` property of an empty SelectorList is empty::
``.attrib`` property of an empty SelectorList is empty:
>>> response.css('foo').attrib
{}
>>> response.css('foo').attrib
{}
Using selectors with regular expressions
----------------------------------------
@ -390,21 +387,21 @@ data using regular expressions. However, unlike using ``.xpath()`` or
can't construct nested ``.re()`` calls.
Here's an example used to extract image names from the :ref:`HTML code
<topics-selectors-htmlcode>` above::
<topics-selectors-htmlcode>` above:
>>> response.xpath('//a[contains(@href, "image")]/text()').re(r'Name:\s*(.*)')
['My image 1',
'My image 2',
'My image 3',
'My image 4',
'My image 5']
>>> response.xpath('//a[contains(@href, "image")]/text()').re(r'Name:\s*(.*)')
['My image 1',
'My image 2',
'My image 3',
'My image 4',
'My image 5']
There's an additional helper reciprocating ``.get()`` (and its
alias ``.extract_first()``) for ``.re()``, named ``.re_first()``.
Use it to extract just the first matching string::
Use it to extract just the first matching string:
>>> response.xpath('//a[contains(@href, "image")]/text()').re_first(r'Name:\s*(.*)')
'My image 1'
>>> response.xpath('//a[contains(@href, "image")]/text()').re_first(r'Name:\s*(.*)')
'My image 1'
.. _old-extraction-api:
@ -422,28 +419,28 @@ and readable code.
The following examples show how these methods map to each other.
1. ``SelectorList.get()`` is the same as ``SelectorList.extract_first()``::
1. ``SelectorList.get()`` is the same as ``SelectorList.extract_first()``:
>>> response.css('a::attr(href)').get()
'image1.html'
>>> response.css('a::attr(href)').extract_first()
'image1.html'
>>> response.css('a::attr(href)').get()
'image1.html'
>>> response.css('a::attr(href)').extract_first()
'image1.html'
2. ``SelectorList.getall()`` is the same as ``SelectorList.extract()``::
2. ``SelectorList.getall()`` is the same as ``SelectorList.extract()``:
>>> response.css('a::attr(href)').getall()
['image1.html', 'image2.html', 'image3.html', 'image4.html', 'image5.html']
>>> response.css('a::attr(href)').extract()
['image1.html', 'image2.html', 'image3.html', 'image4.html', 'image5.html']
>>> response.css('a::attr(href)').getall()
['image1.html', 'image2.html', 'image3.html', 'image4.html', 'image5.html']
>>> response.css('a::attr(href)').extract()
['image1.html', 'image2.html', 'image3.html', 'image4.html', 'image5.html']
3. ``Selector.get()`` is the same as ``Selector.extract()``::
3. ``Selector.get()`` is the same as ``Selector.extract()``:
>>> response.css('a::attr(href)')[0].get()
'image1.html'
>>> response.css('a::attr(href)')[0].extract()
'image1.html'
>>> response.css('a::attr(href)')[0].get()
'image1.html'
>>> response.css('a::attr(href)')[0].extract()
'image1.html'
4. For consistency, there is also ``Selector.getall()``, which returns a list::
4. For consistency, there is also ``Selector.getall()``, which returns a list:
>>> response.css('a::attr(href)')[0].getall()
['image1.html']
@ -481,31 +478,31 @@ with ``/``, that XPath will be absolute to the document and not relative to the
``Selector`` you're calling it from.
For example, suppose you want to extract all ``<p>`` elements inside ``<div>``
elements. First, you would get all ``<div>`` elements::
elements. First, you would get all ``<div>`` elements:
>>> divs = response.xpath('//div')
>>> divs = response.xpath('//div')
At first, you may be tempted to use the following approach, which is wrong, as
it actually extracts all ``<p>`` elements from the document, not only those
inside ``<div>`` elements::
inside ``<div>`` elements:
>>> for p in divs.xpath('//p'): # this is wrong - gets all <p> from the whole document
... print(p.get())
>>> for p in divs.xpath('//p'): # this is wrong - gets all <p> from the whole document
... print(p.get())
This is the proper way to do it (note the dot prefixing the ``.//p`` XPath)::
This is the proper way to do it (note the dot prefixing the ``.//p`` XPath):
>>> for p in divs.xpath('.//p'): # extracts all <p> inside
... print(p.get())
>>> for p in divs.xpath('.//p'): # extracts all <p> inside
... print(p.get())
Another common case would be to extract all direct ``<p>`` children::
Another common case would be to extract all direct ``<p>`` children:
>>> for p in divs.xpath('p'):
... print(p.get())
>>> for p in divs.xpath('p'):
... print(p.get())
For more details about relative XPaths see the `Location Paths`_ section in the
XPath specification.
.. _Location Paths: https://www.w3.org/TR/xpath#location-paths
.. _Location Paths: https://www.w3.org/TR/xpath/all/#location-paths
When querying by class, consider using CSS
------------------------------------------
@ -521,12 +518,12 @@ for that you may end up with more elements that you want, if they have a differe
class name that shares the string ``someclass``.
As it turns out, Scrapy selectors allow you to chain selectors, so most of the time
you can just select by class using CSS and then switch to XPath when needed::
you can just select by class using CSS and then switch to XPath when needed:
>>> from scrapy import Selector
>>> sel = Selector(text='<div class="hero shout"><time datetime="2014-07-23 19:00">Special date</time></div>')
>>> sel.css('.shout').xpath('./time/@datetime').getall()
['2014-07-23 19:00']
>>> from scrapy import Selector
>>> sel = Selector(text='<div class="hero shout"><time datetime="2014-07-23 19:00">Special date</time></div>')
>>> sel.css('.shout').xpath('./time/@datetime').getall()
['2014-07-23 19:00']
This is cleaner than using the verbose XPath trick shown above. Just remember
to use the ``.`` in the XPath expressions that will follow.
@ -538,41 +535,41 @@ Beware of the difference between //node[1] and (//node)[1]
``(//node)[1]`` selects all the nodes in the document, and then gets only the first of them.
Example::
Example:
>>> from scrapy import Selector
>>> sel = Selector(text="""
....: <ul class="list">
....: <li>1</li>
....: <li>2</li>
....: <li>3</li>
....: </ul>
....: <ul class="list">
....: <li>4</li>
....: <li>5</li>
....: <li>6</li>
....: </ul>""")
>>> xp = lambda x: sel.xpath(x).getall()
>>> from scrapy import Selector
>>> sel = Selector(text="""
....: <ul class="list">
....: <li>1</li>
....: <li>2</li>
....: <li>3</li>
....: </ul>
....: <ul class="list">
....: <li>4</li>
....: <li>5</li>
....: <li>6</li>
....: </ul>""")
>>> xp = lambda x: sel.xpath(x).getall()
This gets all first ``<li>`` elements under whatever it is its parent::
This gets all first ``<li>`` elements under whatever it is its parent:
>>> xp("//li[1]")
['<li>1</li>', '<li>4</li>']
>>> xp("//li[1]")
['<li>1</li>', '<li>4</li>']
And this gets the first ``<li>`` element in the whole document::
And this gets the first ``<li>`` element in the whole document:
>>> xp("(//li)[1]")
['<li>1</li>']
>>> xp("(//li)[1]")
['<li>1</li>']
This gets all first ``<li>`` elements under an ``<ul>`` parent::
This gets all first ``<li>`` elements under an ``<ul>`` parent:
>>> xp("//ul/li[1]")
['<li>1</li>', '<li>4</li>']
>>> xp("//ul/li[1]")
['<li>1</li>', '<li>4</li>']
And this gets the first ``<li>`` element under an ``<ul>`` parent in the whole document::
And this gets the first ``<li>`` element under an ``<ul>`` parent in the whole document:
>>> xp("(//ul/li)[1]")
['<li>1</li>']
>>> xp("(//ul/li)[1]")
['<li>1</li>']
Using text nodes in a condition
-------------------------------
@ -584,36 +581,36 @@ This is because the expression ``.//text()`` yields a collection of text element
And when a node-set is converted to a string, which happens when it is passed as argument to
a string function like ``contains()`` or ``starts-with()``, it results in the text for the first element only.
Example::
Example:
>>> from scrapy import Selector
>>> sel = Selector(text='<a href="#">Click here to go to the <strong>Next Page</strong></a>')
>>> from scrapy import Selector
>>> sel = Selector(text='<a href="#">Click here to go to the <strong>Next Page</strong></a>')
Converting a *node-set* to string::
Converting a *node-set* to string:
>>> sel.xpath('//a//text()').getall() # take a peek at the node-set
['Click here to go to the ', 'Next Page']
>>> sel.xpath("string(//a[1]//text())").getall() # convert it to string
['Click here to go to the ']
>>> sel.xpath('//a//text()').getall() # take a peek at the node-set
['Click here to go to the ', 'Next Page']
>>> sel.xpath("string(//a[1]//text())").getall() # convert it to string
['Click here to go to the ']
A *node* converted to a string, however, puts together the text of itself plus of all its descendants::
A *node* converted to a string, however, puts together the text of itself plus of all its descendants:
>>> sel.xpath("//a[1]").getall() # select the first node
['<a href="#">Click here to go to the <strong>Next Page</strong></a>']
>>> sel.xpath("string(//a[1])").getall() # convert it to string
['Click here to go to the Next Page']
>>> sel.xpath("//a[1]").getall() # select the first node
['<a href="#">Click here to go to the <strong>Next Page</strong></a>']
>>> sel.xpath("string(//a[1])").getall() # convert it to string
['Click here to go to the Next Page']
So, using the ``.//text()`` node-set won't select anything in this case::
So, using the ``.//text()`` node-set won't select anything in this case:
>>> sel.xpath("//a[contains(.//text(), 'Next Page')]").getall()
[]
>>> sel.xpath("//a[contains(.//text(), 'Next Page')]").getall()
[]
But using the ``.`` to mean the node, works::
But using the ``.`` to mean the node, works:
>>> sel.xpath("//a[contains(., 'Next Page')]").getall()
['<a href="#">Click here to go to the <strong>Next Page</strong></a>']
>>> sel.xpath("//a[contains(., 'Next Page')]").getall()
['<a href="#">Click here to go to the <strong>Next Page</strong></a>']
.. _`XPath string function`: https://www.w3.org/TR/xpath/#section-String-Functions
.. _`XPath string function`: https://www.w3.org/TR/xpath/all/#section-String-Functions
.. _topics-selectors-xpath-variables:
@ -627,17 +624,17 @@ some arguments in your queries with placeholders like ``?``,
which are then substituted with values passed with the query.
Here's an example to match an element based on its "id" attribute value,
without hard-coding it (that was shown previously)::
without hard-coding it (that was shown previously):
>>> # `$val` used in the expression, a `val` argument needs to be passed
>>> response.xpath('//div[@id=$val]/a/text()', val='images').get()
'Name: My image 1 '
>>> # `$val` used in the expression, a `val` argument needs to be passed
>>> response.xpath('//div[@id=$val]/a/text()', val='images').get()
'Name: My image 1 '
Here's another example, to find the "id" attribute of a ``<div>`` tag containing
five ``<a>`` children (here we pass the value ``5`` as an integer)::
five ``<a>`` children (here we pass the value ``5`` as an integer):
>>> response.xpath('//div[count(a)=$cnt]/@id', cnt=5).get()
'images'
>>> response.xpath('//div[count(a)=$cnt]/@id', cnt=5).get()
'images'
All variable references must have a binding value when calling ``.xpath()``
(otherwise you'll get a ``ValueError: XPath error:`` exception).
@ -687,19 +684,19 @@ You can see several namespace declarations including a default
.. highlight:: python
Once in the shell we can try selecting all ``<link>`` objects and see that it
doesn't work (because the Atom XML namespace is obfuscating those nodes)::
doesn't work (because the Atom XML namespace is obfuscating those nodes):
>>> response.xpath("//link")
[]
>>> response.xpath("//link")
[]
But once we call the :meth:`Selector.remove_namespaces` method, all
nodes can be accessed directly by their names::
nodes can be accessed directly by their names:
>>> response.selector.remove_namespaces()
>>> response.xpath("//link")
[<Selector xpath='//link' data='<link rel="alternate" type="text/html" h'>,
<Selector xpath='//link' data='<link rel="next" type="application/atom+'>,
...
>>> response.selector.remove_namespaces()
>>> response.xpath("//link")
[<Selector xpath='//link' data='<link rel="alternate" type="text/html" h'>,
<Selector xpath='//link' data='<link rel="next" type="application/atom+'>,
...
If you wonder why the namespace removal procedure isn't always called by default
instead of having to call it manually, this is because of two reasons, which, in order
@ -734,26 +731,25 @@ Regular expressions
The ``test()`` function, for example, can prove quite useful when XPath's
``starts-with()`` or ``contains()`` are not sufficient.
Example selecting links in list item with a "class" attribute ending with a digit::
Example selecting links in list item with a "class" attribute ending with a digit:
>>> from scrapy import Selector
>>> doc = u"""
... <div>
... <ul>
... <li class="item-0"><a href="link1.html">first item</a></li>
... <li class="item-1"><a href="link2.html">second item</a></li>
... <li class="item-inactive"><a href="link3.html">third item</a></li>
... <li class="item-1"><a href="link4.html">fourth item</a></li>
... <li class="item-0"><a href="link5.html">fifth item</a></li>
... </ul>
... </div>
... """
>>> sel = Selector(text=doc, type="html")
>>> sel.xpath('//li//@href').getall()
['link1.html', 'link2.html', 'link3.html', 'link4.html', 'link5.html']
>>> sel.xpath('//li[re:test(@class, "item-\d$")]//@href').getall()
['link1.html', 'link2.html', 'link4.html', 'link5.html']
>>>
>>> from scrapy import Selector
>>> doc = u"""
... <div>
... <ul>
... <li class="item-0"><a href="link1.html">first item</a></li>
... <li class="item-1"><a href="link2.html">second item</a></li>
... <li class="item-inactive"><a href="link3.html">third item</a></li>
... <li class="item-1"><a href="link4.html">fourth item</a></li>
... <li class="item-0"><a href="link5.html">fifth item</a></li>
... </ul>
... </div>
... """
>>> sel = Selector(text=doc, type="html")
>>> sel.xpath('//li//@href').getall()
['link1.html', 'link2.html', 'link3.html', 'link4.html', 'link5.html']
>>> sel.xpath('//li[re:test(@class, "item-\d$")]//@href').getall()
['link1.html', 'link2.html', 'link4.html', 'link5.html']
.. warning:: C library ``libxslt`` doesn't natively support EXSLT regular
expressions so `lxml`_'s implementation uses hooks to Python's ``re`` module.
@ -766,7 +762,7 @@ Set operations
These can be handy for excluding parts of a document tree before
extracting text elements for example.
Example extracting microdata (sample content taken from http://schema.org/Product)
Example extracting microdata (sample content taken from https://schema.org/Product)
with groups of itemscopes and corresponding itemprops::
>>> doc = u"""
@ -849,7 +845,6 @@ with groups of itemscopes and corresponding itemprops::
current scope: ['http://schema.org/Rating']
properties: ['worstRating', 'ratingValue', 'bestRating']
>>>
Here we first iterate over ``itemscope`` elements, and for each one,
we look for all ``itemprops`` elements and exclude those that are themselves
@ -877,15 +872,15 @@ For the following HTML::
.. highlight:: python
You can use it like this::
You can use it like this:
>>> response.xpath('//p[has-class("foo")]')
[<Selector xpath='//p[has-class("foo")]' data='<p class="foo bar-baz">First</p>'>,
<Selector xpath='//p[has-class("foo")]' data='<p class="foo">Second</p>'>]
>>> response.xpath('//p[has-class("foo", "bar-baz")]')
[<Selector xpath='//p[has-class("foo", "bar-baz")]' data='<p class="foo bar-baz">First</p>'>]
>>> response.xpath('//p[has-class("foo", "bar")]')
[]
>>> response.xpath('//p[has-class("foo")]')
[<Selector xpath='//p[has-class("foo")]' data='<p class="foo bar-baz">First</p>'>,
<Selector xpath='//p[has-class("foo")]' data='<p class="foo">Second</p>'>]
>>> response.xpath('//p[has-class("foo", "bar-baz")]')
[<Selector xpath='//p[has-class("foo", "bar-baz")]' data='<p class="foo bar-baz">First</p>'>]
>>> response.xpath('//p[has-class("foo", "bar")]')
[]
So XPath ``//p[has-class("foo", "bar-baz")]`` is roughly equivalent to CSS
``p.foo.bar-baz``. Please note, that it is slower in most of the cases,
@ -989,7 +984,7 @@ a :class:`~scrapy.http.HtmlResponse` object like this::
sel = Selector(html_response)
1. Select all ``<h1>`` elements from an HTML response body, returning a list of
:class:`Selector` objects (ie. a :class:`SelectorList` object)::
:class:`Selector` objects (i.e. a :class:`SelectorList` object)::
sel.xpath("//h1")
@ -1016,7 +1011,7 @@ instantiated with an :class:`~scrapy.http.XmlResponse` object::
sel = Selector(xml_response)
1. Select all ``<product>`` elements from an XML response body, returning a list
of :class:`Selector` objects (ie. a :class:`SelectorList` object)::
of :class:`Selector` objects (i.e. a :class:`SelectorList` object)::
sel.xpath("//product")

192
docs/topics/settings.rst
View File

@ -26,9 +26,7 @@ do this by using an environment variable, ``SCRAPY_SETTINGS_MODULE``.
The value of ``SCRAPY_SETTINGS_MODULE`` should be in Python path syntax, e.g.
``myproject.settings``. Note that the settings module should be on the
Python `import search path`_.
.. _import search path: https://docs.python.org/2/tutorial/modules.html#the-module-search-path
Python :ref:`import search path <tut-searchpath>`.
.. _populating-settings:
@ -124,7 +122,7 @@ Settings can be accessed through the :attr:`scrapy.crawler.Crawler.settings`
attribute of the Crawler that is passed to ``from_crawler`` method in
extensions, middlewares and item pipelines::
class MyExtension(object):
class MyExtension:
def __init__(self, log_is_enabled=False):
if log_is_enabled:
print("log is enabled!")
@ -248,7 +246,7 @@ CONCURRENT_REQUESTS
Default: ``16``
The maximum number of concurrent (ie. simultaneous) requests that will be
The maximum number of concurrent (i.e. simultaneous) requests that will be
performed by the Scrapy downloader.
.. setting:: CONCURRENT_REQUESTS_PER_DOMAIN
@ -258,7 +256,7 @@ CONCURRENT_REQUESTS_PER_DOMAIN
Default: ``8``
The maximum number of concurrent (ie. simultaneous) requests that will be
The maximum number of concurrent (i.e. simultaneous) requests that will be
performed to any single domain.
See also: :ref:`topics-autothrottle` and its
@ -272,7 +270,7 @@ CONCURRENT_REQUESTS_PER_IP
Default: ``0``
The maximum number of concurrent (ie. simultaneous) requests that will be
The maximum number of concurrent (i.e. simultaneous) requests that will be
performed to any single IP. If non-zero, the
:setting:`CONCURRENT_REQUESTS_PER_DOMAIN` setting is ignored, and this one is
used instead. In other words, concurrency limits will be applied per IP, not
@ -376,6 +374,21 @@ Default: ``10000``
DNS in-memory cache size.
.. setting:: DNS_RESOLVER
DNS_RESOLVER
------------
.. versionadded:: 2.0
Default: ``'scrapy.resolver.CachingThreadedResolver'``
The class to be used to resolve DNS names. The default ``scrapy.resolver.CachingThreadedResolver``
supports specifying a timeout for DNS requests via the :setting:`DNS_TIMEOUT` setting,
but works only with IPv4 addresses. Scrapy provides an alternative resolver,
``scrapy.resolver.CachingHostnameResolver``, which supports IPv4/IPv6 addresses but does not
take the :setting:`DNS_TIMEOUT` setting into account.
.. setting:: DNS_TIMEOUT
DNS_TIMEOUT
@ -407,10 +420,9 @@ connections (for ``HTTP10DownloadHandler``).
.. note::
HTTP/1.0 is rarely used nowadays so you can safely ignore this setting,
unless you use Twisted<11.1, or if you really want to use HTTP/1.0
and override :setting:`DOWNLOAD_HANDLERS_BASE` for ``http(s)`` scheme
accordingly, i.e. to
``'scrapy.core.downloader.handlers.http.HTTP10DownloadHandler'``.
unless you really want to use HTTP/1.0 and override
:setting:`DOWNLOAD_HANDLERS` for ``http(s)`` scheme accordingly,
i.e. to ``'scrapy.core.downloader.handlers.http.HTTP10DownloadHandler'``.
.. setting:: DOWNLOADER_CLIENTCONTEXTFACTORY
@ -434,7 +446,6 @@ or even enable client-side authentication (and various other things).
Scrapy also has another context factory class that you can set,
``'scrapy.core.downloader.contextfactory.BrowserLikeContextFactory'``,
which uses the platform's certificates to validate remote endpoints.
**This is only available if you use Twisted>=14.0.**
If you do use a custom ContextFactory, make sure its ``__init__`` method
accepts a ``method`` parameter (this is the ``OpenSSL.SSL`` method mapping
@ -481,10 +492,6 @@ This setting must be one of these string values:
- ``'TLSv1.2'``: forces TLS version 1.2
- ``'SSLv3'``: forces SSL version 3 (**not recommended**)
.. note::
We recommend that you use PyOpenSSL>=0.13 and Twisted>=0.13
or above (Twisted>=14.0 if you can).
.. setting:: DOWNLOADER_CLIENT_TLS_VERBOSE_LOGGING
@ -647,8 +654,6 @@ If you want to disable it set to 0.
spider attribute and per-request using :reqmeta:`download_maxsize`
Request.meta key.
This feature needs Twisted >= 11.1.
.. setting:: DOWNLOAD_WARNSIZE
DOWNLOAD_WARNSIZE
@ -666,8 +671,6 @@ If you want to disable it set to 0.
spider attribute and per-request using :reqmeta:`download_warnsize`
Request.meta key.
This feature needs Twisted >= 11.1.
.. setting:: DOWNLOAD_FAIL_ON_DATALOSS
DOWNLOAD_FAIL_ON_DATALOSS
@ -884,10 +887,9 @@ LOG_FORMAT
Default: ``'%(asctime)s [%(name)s] %(levelname)s: %(message)s'``
String for formatting log messsages. Refer to the `Python logging documentation`_ for the whole list of available
placeholders.
.. _Python logging documentation: https://docs.python.org/2/library/logging.html#logrecord-attributes
String for formatting log messages. Refer to the
:ref:`Python logging documentation <logrecord-attributes>` for the qwhole
list of available placeholders.
.. setting:: LOG_DATEFORMAT
@ -897,10 +899,9 @@ LOG_DATEFORMAT
Default: ``'%Y-%m-%d %H:%M:%S'``
String for formatting date/time, expansion of the ``%(asctime)s`` placeholder
in :setting:`LOG_FORMAT`. Refer to the `Python datetime documentation`_ for the whole list of available
directives.
.. _Python datetime documentation: https://docs.python.org/2/library/datetime.html#strftime-and-strptime-behavior
in :setting:`LOG_FORMAT`. Refer to the
:ref:`Python datetime documentation <strftime-strptime-behavior>` for the
whole list of available directives.
.. setting:: LOG_FORMATTER
@ -1101,17 +1102,6 @@ multi-purpose thread pool used by various Scrapy components. Threaded
DNS Resolver, BlockingFeedStorage, S3FilesStore just to name a few. Increase
this value if you're experiencing problems with insufficient blocking IO.
.. setting:: REDIRECT_MAX_TIMES
REDIRECT_MAX_TIMES
------------------
Default: ``20``
Defines the maximum times a request can be redirected. After this maximum the
request's response is returned as is. We used Firefox default value for the
same task.
.. setting:: REDIRECT_PRIORITY_ADJUST
REDIRECT_PRIORITY_ADJUST
@ -1241,6 +1231,20 @@ Type of priority queue used by the scheduler. Another available type is
domains in parallel. But currently ``scrapy.pqueues.DownloaderAwarePriorityQueue``
does not work together with :setting:`CONCURRENT_REQUESTS_PER_IP`.
.. setting:: SCRAPER_SLOT_MAX_ACTIVE_SIZE
SCRAPER_SLOT_MAX_ACTIVE_SIZE
----------------------------
.. versionadded:: 2.0
Default: ``5_000_000``
Soft limit (in bytes) for response data being processed.
While the sum of the sizes of all responses being processed is above this value,
Scrapy does not process new requests.
.. setting:: SPIDER_CONTRACTS
SPIDER_CONTRACTS
@ -1264,7 +1268,7 @@ Default::
'scrapy.contracts.default.ScrapesContract': 3,
}
A dict containing the scrapy contracts enabled by default in Scrapy. You should
A dict containing the Scrapy contracts enabled by default in Scrapy. You should
never modify this setting in your project, modify :setting:`SPIDER_CONTRACTS`
instead. For more info see :ref:`topics-contracts`.
@ -1295,7 +1299,7 @@ SPIDER_LOADER_WARN_ONLY
Default: ``False``
By default, when scrapy tries to import spider classes from :setting:`SPIDER_MODULES`,
By default, when Scrapy tries to import spider classes from :setting:`SPIDER_MODULES`,
it will fail loudly if there is any ``ImportError`` exception.
But you can choose to silence this exception and turn it into a simple
warning by setting ``SPIDER_LOADER_WARN_ONLY = True``.
@ -1393,17 +1397,6 @@ Default: ``True``
A boolean which specifies if the :ref:`telnet console <topics-telnetconsole>`
will be enabled (provided its extension is also enabled).
.. setting:: TELNETCONSOLE_PORT
TELNETCONSOLE_PORT
------------------
Default: ``[6023, 6073]``
The port range to use for the telnet console. If set to ``None`` or ``0``, a
dynamically assigned port is used. For more info see
:ref:`topics-telnetconsole`.
.. setting:: TEMPLATES_DIR
TEMPLATES_DIR
@ -1418,6 +1411,101 @@ command.
The project name must not conflict with the name of custom files or directories
in the ``project`` subdirectory.
.. setting:: TWISTED_REACTOR
TWISTED_REACTOR
---------------
.. versionadded:: 2.0
Default: ``None``
Import path of a given :mod:`~twisted.internet.reactor`.
Scrapy will install this reactor if no other reactor is installed yet, such as
when the ``scrapy`` CLI program is invoked or when using the
:class:`~scrapy.crawler.CrawlerProcess` class.
If you are using the :class:`~scrapy.crawler.CrawlerRunner` class, you also
need to install the correct reactor manually. You can do that using
:func:`~scrapy.utils.reactor.install_reactor`:
.. autofunction:: scrapy.utils.reactor.install_reactor
If a reactor is already installed,
:func:`~scrapy.utils.reactor.install_reactor` has no effect.
:meth:`CrawlerRunner.__init__ <scrapy.crawler.CrawlerRunner.__init__>` raises
:exc:`Exception` if the installed reactor does not match the
:setting:`TWISTED_REACTOR` setting; therfore, having top-level
:mod:`~twisted.internet.reactor` imports in project files and imported
third-party libraries will make Scrapy raise :exc:`Exception` when
it checks which reactor is installed.
In order to use the reactor installed by Scrapy::
import scrapy
from twisted.internet import reactor
class QuotesSpider(scrapy.Spider):
name = 'quotes'
def __init__(self, *args, **kwargs):
self.timeout = int(kwargs.pop('timeout', '60'))
super(QuotesSpider, self).__init__(*args, **kwargs)
def start_requests(self):
reactor.callLater(self.timeout, self.stop)
urls = ['http://quotes.toscrape.com/page/1']
for url in urls:
yield scrapy.Request(url=url, callback=self.parse)
def parse(self, response):
for quote in response.css('div.quote'):
yield {'text': quote.css('span.text::text').get()}
def stop(self):
self.crawler.engine.close_spider(self, 'timeout')
which raises :exc:`Exception`, becomes::
import scrapy
class QuotesSpider(scrapy.Spider):
name = 'quotes'
def __init__(self, *args, **kwargs):
self.timeout = int(kwargs.pop('timeout', '60'))
super(QuotesSpider, self).__init__(*args, **kwargs)
def start_requests(self):
from twisted.internet import reactor
reactor.callLater(self.timeout, self.stop)
urls = ['http://quotes.toscrape.com/page/1']
for url in urls:
yield scrapy.Request(url=url, callback=self.parse)
def parse(self, response):
for quote in response.css('div.quote'):
yield {'text': quote.css('span.text::text').get()}
def stop(self):
self.crawler.engine.close_spider(self, 'timeout')
The default value of the :setting:`TWISTED_REACTOR` setting is ``None``, which
means that Scrapy will not attempt to install any specific reactor, and the
default reactor defined by Twisted for the current platform will be used. This
is to maintain backward compatibility and avoid possible problems caused by
using a non-default reactor.
For additional information, see :doc:`core/howto/choosing-reactor`.
.. setting:: URLLENGTH_LIMIT

94
docs/topics/shell.rst
View File

@ -31,7 +31,7 @@ for more info.
Scrapy also has support for `bpython`_, and will try to use it where `IPython`_
is unavailable.
Through scrapy's settings you can configure it to use any one of
Through Scrapy's settings you can configure it to use any one of
``ipython``, ``bpython`` or the standard ``python`` shell, regardless of which
are installed. This is done by setting the ``SCRAPY_PYTHON_SHELL`` environment
variable; or by defining it in your :ref:`scrapy.cfg <topics-config-settings>`::
@ -41,7 +41,7 @@ variable; or by defining it in your :ref:`scrapy.cfg <topics-config-settings>`::
.. _IPython: https://ipython.org/
.. _IPython installation guide: https://ipython.org/install.html
.. _bpython: https://www.bpython-interpreter.org/
.. _bpython: https://bpython-interpreter.org/
Launch the shell
================
@ -142,7 +142,7 @@ Example of shell session
========================
Here's an example of a typical shell session where we start by scraping the
https://scrapy.org page, and then proceed to scrape the https://reddit.com
https://scrapy.org page, and then proceed to scrape the https://old.reddit.com/
page. Finally, we modify the (Reddit) request method to POST and re-fetch it
getting an error. We end the session by typing Ctrl-D (in Unix systems) or
Ctrl-Z in Windows.
@ -156,6 +156,17 @@ First, we launch the shell::
scrapy shell 'https://scrapy.org' --nolog
.. note::
Remember to always enclose URLs in quotes when running the Scrapy shell from
the command line, otherwise URLs containing arguments (i.e. the ``&`` character)
will not work.
On Windows, use double quotes instead::
scrapy shell "https://scrapy.org" --nolog
Then, the shell fetches the URL (using the Scrapy downloader) and prints the
list of available objects and useful shortcuts (you'll notice that these lines
all start with the ``[s]`` prefix)::
@ -177,47 +188,46 @@ all start with the ``[s]`` prefix)::
>>>
After that, we can start playing with the objects::
After that, we can start playing with the objects:
>>> response.xpath('//title/text()').get()
'Scrapy | A Fast and Powerful Scraping and Web Crawling Framework'
>>> response.xpath('//title/text()').get()
'Scrapy | A Fast and Powerful Scraping and Web Crawling Framework'
>>> fetch("https://reddit.com")
>>> fetch("https://old.reddit.com/")
>>> response.xpath('//title/text()').get()
'reddit: the front page of the internet'
>>> response.xpath('//title/text()').get()
'reddit: the front page of the internet'
>>> request = request.replace(method="POST")
>>> request = request.replace(method="POST")
>>> fetch(request)
>>> fetch(request)
>>> response.status
404
>>> response.status
404
>>> from pprint import pprint
>>> from pprint import pprint
>>> pprint(response.headers)
{'Accept-Ranges': ['bytes'],
'Cache-Control': ['max-age=0, must-revalidate'],
'Content-Type': ['text/html; charset=UTF-8'],
'Date': ['Thu, 08 Dec 2016 16:21:19 GMT'],
'Server': ['snooserv'],
'Set-Cookie': ['loid=KqNLou0V9SKMX4qb4n; Domain=reddit.com; Max-Age=63071999; Path=/; expires=Sat, 08-Dec-2018 16:21:19 GMT; secure',
'loidcreated=2016-12-08T16%3A21%3A19.445Z; Domain=reddit.com; Max-Age=63071999; Path=/; expires=Sat, 08-Dec-2018 16:21:19 GMT; secure',
'loid=vi0ZVe4NkxNWdlH7r7; Domain=reddit.com; Max-Age=63071999; Path=/; expires=Sat, 08-Dec-2018 16:21:19 GMT; secure',
'loidcreated=2016-12-08T16%3A21%3A19.459Z; Domain=reddit.com; Max-Age=63071999; Path=/; expires=Sat, 08-Dec-2018 16:21:19 GMT; secure'],
'Vary': ['accept-encoding'],
'Via': ['1.1 varnish'],
'X-Cache': ['MISS'],
'X-Cache-Hits': ['0'],
'X-Content-Type-Options': ['nosniff'],
'X-Frame-Options': ['SAMEORIGIN'],
'X-Moose': ['majestic'],
'X-Served-By': ['cache-cdg8730-CDG'],
'X-Timer': ['S1481214079.394283,VS0,VE159'],
'X-Ua-Compatible': ['IE=edge'],
'X-Xss-Protection': ['1; mode=block']}
>>>
>>> pprint(response.headers)
{'Accept-Ranges': ['bytes'],
'Cache-Control': ['max-age=0, must-revalidate'],
'Content-Type': ['text/html; charset=UTF-8'],
'Date': ['Thu, 08 Dec 2016 16:21:19 GMT'],
'Server': ['snooserv'],
'Set-Cookie': ['loid=KqNLou0V9SKMX4qb4n; Domain=reddit.com; Max-Age=63071999; Path=/; expires=Sat, 08-Dec-2018 16:21:19 GMT; secure',
'loidcreated=2016-12-08T16%3A21%3A19.445Z; Domain=reddit.com; Max-Age=63071999; Path=/; expires=Sat, 08-Dec-2018 16:21:19 GMT; secure',
'loid=vi0ZVe4NkxNWdlH7r7; Domain=reddit.com; Max-Age=63071999; Path=/; expires=Sat, 08-Dec-2018 16:21:19 GMT; secure',
'loidcreated=2016-12-08T16%3A21%3A19.459Z; Domain=reddit.com; Max-Age=63071999; Path=/; expires=Sat, 08-Dec-2018 16:21:19 GMT; secure'],
'Vary': ['accept-encoding'],
'Via': ['1.1 varnish'],
'X-Cache': ['MISS'],
'X-Cache-Hits': ['0'],
'X-Content-Type-Options': ['nosniff'],
'X-Frame-Options': ['SAMEORIGIN'],
'X-Moose': ['majestic'],
'X-Served-By': ['cache-cdg8730-CDG'],
'X-Timer': ['S1481214079.394283,VS0,VE159'],
'X-Ua-Compatible': ['IE=edge'],
'X-Xss-Protection': ['1; mode=block']}
.. _topics-shell-inspect-response:
@ -263,16 +273,16 @@ When you run the spider, you will get something similar to this::
>>> response.url
'http://example.org'
Then, you can check if the extraction code is working::
Then, you can check if the extraction code is working:
>>> response.xpath('//h1[@class="fn"]')
[]
>>> response.xpath('//h1[@class="fn"]')
[]
Nope, it doesn't. So you can open the response in your web browser and see if
it's the response you were expecting::
it's the response you were expecting:
>>> view(response)
True
>>> view(response)
True
Finally you hit Ctrl-D (or Ctrl-Z in Windows) to exit the shell and resume the
crawling::

118
docs/topics/signals.rst
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@ -16,8 +16,7 @@ deliver the arguments that the handler receives.
You can connect to signals (or send your own) through the
:ref:`topics-api-signals`.
Here is a simple example showing how you can catch signals and perform some action:
::
Here is a simple example showing how you can catch signals and perform some action::
from scrapy import signals
from scrapy import Spider
@ -46,14 +45,51 @@ Here is a simple example showing how you can catch signals and perform some acti
def parse(self, response):
pass
.. _signal-deferred:
Deferred signal handlers
========================
Some signals support returning :class:`~twisted.internet.defer.Deferred`
objects from their handlers, see the :ref:`topics-signals-ref` below to know
which ones.
objects from their handlers, allowing you to run asynchronous code that
does not block Scrapy. If a signal handler returns a
:class:`~twisted.internet.defer.Deferred`, Scrapy waits for that
:class:`~twisted.internet.defer.Deferred` to fire.
Let's take an example::
class SignalSpider(scrapy.Spider):
name = 'signals'
start_urls = ['http://quotes.toscrape.com/page/1/']
@classmethod
def from_crawler(cls, crawler, *args, **kwargs):
spider = super(SignalSpider, cls).from_crawler(crawler, *args, **kwargs)
crawler.signals.connect(spider.item_scraped, signal=signals.item_scraped)
return spider
def item_scraped(self, item):
# Send the scraped item to the server
d = treq.post(
'http://example.com/post',
json.dumps(item).encode('ascii'),
headers={b'Content-Type': [b'application/json']}
)
# The next item will be scraped only after
# deferred (d) is fired
return d
def parse(self, response):
for quote in response.css('div.quote'):
yield {
'text': quote.css('span.text::text').get(),
'author': quote.css('small.author::text').get(),
'tags': quote.css('div.tags a.tag::text').getall(),
}
See the :ref:`topics-signals-ref` below to know which signals support
:class:`~twisted.internet.defer.Deferred`.
.. _topics-signals-ref:
@ -65,9 +101,12 @@ Built-in signals reference
Here's the list of Scrapy built-in signals and their meaning.
engine_started
Engine signals
--------------
engine_started
~~~~~~~~~~~~~~
.. signal:: engine_started
.. function:: engine_started()
@ -80,7 +119,7 @@ engine_started
getting fired before :signal:`spider_opened`.
engine_stopped
--------------
~~~~~~~~~~~~~~
.. signal:: engine_stopped
.. function:: engine_stopped()
@ -90,9 +129,20 @@ engine_stopped
This signal supports returning deferreds from their handlers.
item_scraped
Item signals
------------
.. note::
As at max :setting:`CONCURRENT_ITEMS` items are processed in
parallel, many deferreds are fired together using
:class:`~twisted.internet.defer.DeferredList`. Hence the next
batch waits for the :class:`~twisted.internet.defer.DeferredList`
to fire and then runs the respective item signal handler for
the next batch of scraped items.
item_scraped
~~~~~~~~~~~~
.. signal:: item_scraped
.. function:: item_scraped(item, response, spider)
@ -111,7 +161,7 @@ item_scraped
:type response: :class:`~scrapy.http.Response` object
item_dropped
------------
~~~~~~~~~~~~
.. signal:: item_dropped
.. function:: item_dropped(item, response, exception, spider)
@ -136,12 +186,12 @@ item_dropped
:type exception: :exc:`~scrapy.exceptions.DropItem` exception
item_error
------------
~~~~~~~~~~
.. signal:: item_error
.. function:: item_error(item, response, spider, failure)
Sent when a :ref:`topics-item-pipeline` generates an error (ie. raises
Sent when a :ref:`topics-item-pipeline` generates an error (i.e. raises
an exception), except :exc:`~scrapy.exceptions.DropItem` exception.
This signal supports returning deferreds from their handlers.
@ -158,8 +208,11 @@ item_error
:param failure: the exception raised
:type failure: twisted.python.failure.Failure
Spider signals
--------------
spider_closed
-------------
~~~~~~~~~~~~~
.. signal:: spider_closed
.. function:: spider_closed(spider, reason)
@ -182,7 +235,7 @@ spider_closed
:type reason: str
spider_opened
-------------
~~~~~~~~~~~~~
.. signal:: spider_opened
.. function:: spider_opened(spider)
@ -197,7 +250,7 @@ spider_opened
:type spider: :class:`~scrapy.spiders.Spider` object
spider_idle
-----------
~~~~~~~~~~~
.. signal:: spider_idle
.. function:: spider_idle(spider)
@ -227,12 +280,12 @@ spider_idle
due to duplication).
spider_error
------------
~~~~~~~~~~~~
.. signal:: spider_error
.. function:: spider_error(failure, response, spider)
Sent when a spider callback generates an error (ie. raises an exception).
Sent when a spider callback generates an error (i.e. raises an exception).
This signal does not support returning deferreds from their handlers.
@ -245,8 +298,11 @@ spider_error
:param spider: the spider which raised the exception
:type spider: :class:`~scrapy.spiders.Spider` object
Request signals
---------------
request_scheduled
-----------------
~~~~~~~~~~~~~~~~~
.. signal:: request_scheduled
.. function:: request_scheduled(request, spider)
@ -263,7 +319,7 @@ request_scheduled
:type spider: :class:`~scrapy.spiders.Spider` object
request_dropped
---------------
~~~~~~~~~~~~~~~
.. signal:: request_dropped
.. function:: request_dropped(request, spider)
@ -280,7 +336,7 @@ request_dropped
:type spider: :class:`~scrapy.spiders.Spider` object
request_reached_downloader
---------------------------
~~~~~~~~~~~~~~~~~~~~~~~~~~
.. signal:: request_reached_downloader
.. function:: request_reached_downloader(request, spider)
@ -295,8 +351,30 @@ request_reached_downloader
:param spider: the spider that yielded the request
:type spider: :class:`~scrapy.spiders.Spider` object
request_left_downloader
~~~~~~~~~~~~~~~~~~~~~~~
.. signal:: request_left_downloader
.. function:: request_left_downloader(request, spider)
.. versionadded:: 2.0
Sent when a :class:`~scrapy.http.Request` leaves the downloader, even in case of
failure.
This signal does not support returning deferreds from its handlers.
:param request: the request that reached the downloader
:type request: :class:`~scrapy.http.Request` object
:param spider: the spider that yielded the request
:type spider: :class:`~scrapy.spiders.Spider` object
Response signals
----------------
response_received
-----------------
~~~~~~~~~~~~~~~~~
.. signal:: response_received
.. function:: response_received(response, request, spider)
@ -316,7 +394,7 @@ response_received
:type spider: :class:`~scrapy.spiders.Spider` object
response_downloaded
-------------------
~~~~~~~~~~~~~~~~~~~
.. signal:: response_downloaded
.. function:: response_downloaded(response, request, spider)

10
docs/topics/spider-middleware.rst
View File

@ -140,7 +140,7 @@ object gives you access, for example, to the :ref:`settings <topics-settings>`.
:type response: :class:`~scrapy.http.Response` object
:param exception: the exception raised
:type exception: `Exception`_ object
:type exception: :exc:`Exception` object
:param spider: the spider which raised the exception
:type spider: :class:`~scrapy.spiders.Spider` object
@ -173,20 +173,16 @@ object gives you access, for example, to the :ref:`settings <topics-settings>`.
:type spider: :class:`~scrapy.spiders.Spider` object
.. method:: from_crawler(cls, crawler)
If present, this classmethod is called to create a middleware instance
from a :class:`~scrapy.crawler.Crawler`. It must return a new instance
of the middleware. Crawler object provides access to all Scrapy core
components like settings and signals; it is a way for middleware to
access them and hook its functionality into Scrapy.
:param crawler: crawler that uses this middleware
:type crawler: :class:`~scrapy.crawler.Crawler` object
.. _Exception: https://docs.python.org/2/library/exceptions.html#exceptions.Exception
.. _topics-spider-middleware-ref:
Built-in spider middleware reference

15
docs/topics/spiders.rst
View File

@ -298,9 +298,7 @@ Keep in mind that spider arguments are only strings.
The spider will not do any parsing on its own.
If you were to set the ``start_urls`` attribute from the command line,
you would have to parse it on your own into a list
using something like
`ast.literal_eval <https://docs.python.org/library/ast.html#ast.literal_eval>`_
or `json.loads <https://docs.python.org/library/json.html#json.loads>`_
using something like :func:`ast.literal_eval` or :func:`json.loads`
and then set it as an attribute.
Otherwise, you would cause iteration over a ``start_urls`` string
(a very common python pitfall)
@ -414,6 +412,15 @@ Crawling rules
from which the request originated as second argument. It must return a
``Request`` object or ``None`` (to filter out the request).
``errback`` is a callable or a string (in which case a method from the spider
object with that name will be used) to be called if any exception is
raised while processing a request generated by the rule.
It receives a :class:`Twisted Failure <twisted.python.failure.Failure>`
instance as first parameter.
.. versionadded:: 2.0
The *errback* parameter.
CrawlSpider example
~~~~~~~~~~~~~~~~~~~
@ -805,6 +812,6 @@ Combine SitemapSpider with other sources of urls::
.. _Sitemaps: https://www.sitemaps.org/index.html
.. _Sitemap index files: https://www.sitemaps.org/protocol.html#index
.. _robots.txt: http://www.robotstxt.org/
.. _robots.txt: https://www.robotstxt.org/
.. _TLD: https://en.wikipedia.org/wiki/Top-level_domain
.. _Scrapyd documentation: https://scrapyd.readthedocs.io/en/latest/

14
docs/topics/stats.rst
View File

@ -32,7 +32,7 @@ Common Stats Collector uses
Access the stats collector through the :attr:`~scrapy.crawler.Crawler.stats`
attribute. Here is an example of an extension that access stats::
class ExtensionThatAccessStats(object):
class ExtensionThatAccessStats:
def __init__(self, stats):
self.stats = stats
@ -57,15 +57,15 @@ Set stat value only if lower than previous::
stats.min_value('min_free_memory_percent', value)
Get stat value::
Get stat value:
>>> stats.get_value('custom_count')
1
>>> stats.get_value('custom_count')
1
Get all stats::
Get all stats:
>>> stats.get_stats()
{'custom_count': 1, 'start_time': datetime.datetime(2009, 7, 14, 21, 47, 28, 977139)}
>>> stats.get_stats()
{'custom_count': 1, 'start_time': datetime.datetime(2009, 7, 14, 21, 47, 28, 977139)}
Available Stats Collectors
==========================

15
docs/topics/telnetconsole.rst
View File

@ -40,15 +40,15 @@ the console you need to type::
Connected to localhost.
Escape character is '^]'.
Username:
Password:
Password:
>>>
By default Username is ``scrapy`` and Password is autogenerated. The
autogenerated Password can be seen on scrapy logs like the example below::
By default Username is ``scrapy`` and Password is autogenerated. The
autogenerated Password can be seen on Scrapy logs like the example below::
2018-10-16 14:35:21 [scrapy.extensions.telnet] INFO: Telnet Password: 16f92501e8a59326
Default Username and Password can be overriden by the settings
Default Username and Password can be overridden by the settings
:setting:`TELNETCONSOLE_USERNAME` and :setting:`TELNETCONSOLE_PASSWORD`.
.. warning::
@ -63,7 +63,7 @@ Available variables in the telnet console
=========================================
The telnet console is like a regular Python shell running inside the Scrapy
process, so you can do anything from it including importing new modules, etc.
process, so you can do anything from it including importing new modules, etc.
However, the telnet console comes with some default variables defined for
convenience:
@ -89,13 +89,11 @@ convenience:
+----------------+-------------------------------------------------------------------+
| ``prefs`` | for memory debugging (see :ref:`topics-leaks`) |
+----------------+-------------------------------------------------------------------+
| ``p`` | a shortcut to the `pprint.pprint`_ function |
| ``p`` | a shortcut to the :func:`pprint.pprint` function |
+----------------+-------------------------------------------------------------------+
| ``hpy`` | for memory debugging (see :ref:`topics-leaks`) |
+----------------+-------------------------------------------------------------------+
.. _pprint.pprint: https://docs.python.org/library/pprint.html#pprint.pprint
Telnet console usage examples
=============================
@ -208,4 +206,3 @@ Default: ``None``
The password used for the telnet console, default behaviour is to have it
autogenerated

83
extras/scrapy_zsh_completion
View File

@ -1,11 +1,12 @@
#compdef scrapy
_scrapy() {
local context state state_descr line
local ret=1
typeset -A opt_args
_arguments \
"(- 1 *)--help[Help]" \
"(- 1 *)"{-h,--help}"[Help]" \
"1: :->command" \
"*:: :->args"
"*:: :->args" && ret=0
case $state in
command)
@ -13,40 +14,40 @@ _scrapy() {
;;
args)
case $words[1] in
bench)
(bench)
_scrapy_glb_opts
;;
fetch)
(fetch)
local options=(
'--headers[print response HTTP headers instead of body]'
'--no-redirect[do not handle HTTP 3xx status codes and print response as-is]'
'--spider[use this spider]:spider:_scrapy_spiders'
'--spider=[use this spider]:spider:_scrapy_spiders'
'1::URL:_httpie_urls'
)
_scrapy_glb_opts $options
;;
genspider)
(genspider)
local options=(
{-l,--list}'[List available templates]'
{-e,--edit}'[Edit spider after creating it]'
{'(--list)-l','(-l)--list'}'[List available templates]'
{'(--edit)-e','(-e)--edit'}'[Edit spider after creating it]'
'--force[If the spider already exists, overwrite it with the template]'
{-d,--dump=}'[Dump template to standard output]:template:(basic crawl csvfeed xmlfeed)'
{-t,--template=}'[Uses a custom template]:template:(basic crawl csvfeed xmlfeed)'
{'(--dump)-d','(-d)--dump='}'[Dump template to standard output]:template:(basic crawl csvfeed xmlfeed)'
{'(--template)-t','(-t)--template='}'[Uses a custom template]:template:(basic crawl csvfeed xmlfeed)'
'1:name:(NAME)'
'2:domain:_httpie_urls'
)
_scrapy_glb_opts $options
;;
runspider)
(runspider)
local options=(
{-o,--output}'[dump scraped items into FILE (use - for stdout)]:file:_files'
{-t,--output-format}'[format to use for dumping items with -o]:format:(FORMAT)'
{'(--output)-o','(-o)--output='}'[dump scraped items into FILE (use - for stdout)]:file:_files'
{'(--output-format)-t','(-t)--output-format='}'[format to use for dumping items with -o]:format:(FORMAT)'
'*-a[set spider argument (may be repeated)]:value pair:(NAME=VALUE)'
'1:spider file:_files -g \*.py'
)
_scrapy_glb_opts $options
;;
settings)
(settings)
local options=(
'--get=[print raw setting value]:option:(SETTING)'
'--getbool=[print setting value, interpreted as a boolean]:option:(SETTING)'
@ -56,77 +57,77 @@ _scrapy() {
)
_scrapy_glb_opts $options
;;
shell)
(shell)
local options=(
'-c[evaluate the code in the shell, print the result and exit]:code:(CODE)'
'--no-redirect[do not handle HTTP 3xx status codes and print response as-is]'
'--spider[use this spider]:spider:_scrapy_spiders'
'--spider=[use this spider]:spider:_scrapy_spiders'
'::file:_files -g \*.html'
'::URL:_httpie_urls'
)
_scrapy_glb_opts $options
;;
startproject)
(startproject)
local options=(
'1:name:(NAME)'
'2:dir:_dir_list'
)
_scrapy_glb_opts $options
;;
version)
(version)
local options=(
{-v,--verbose}'[also display twisted/python/platform info (useful for bug reports)]'
{'(--verbose)-v','(-v)--verbose'}'[also display twisted/python/platform info (useful for bug reports)]'
)
_scrapy_glb_opts $options
;;
view)
(view)
local options=(
'--no-redirect[do not handle HTTP 3xx status codes and print response as-is]'
'--spider[use this spider]:spider:_scrapy_spiders'
'--spider=[use this spider]:spider:_scrapy_spiders'
'1:URL:_httpie_urls'
)
_scrapy_glb_opts $options
;;
check)
(check)
local options=(
'(- 1 *)'{-l,--list}'[only list contracts, without checking them]'
{-v,--verbose}'[print contract tests for all spiders]'
{'(--list)-l','(-l)--list'}'[only list contracts, without checking them]'
{'(--verbose)-v','(-v)--verbose'}'[print contract tests for all spiders]'
'1:spider:_scrapy_spiders'
)
_scrapy_glb_opts $options
;;
crawl)
(crawl)
local options=(
{-o,--output}'[dump scraped items into FILE (use - for stdout)]:file:_files'
{-t,--output-format}'[format to use for dumping items with -o]:format:(FORMAT)'
{'(--output)-o','(-o)--output='}'[dump scraped items into FILE (use - for stdout)]:file:_files'
{'(--output-format)-t','(-t)--output-format='}'[format to use for dumping items with -o]:format:(FORMAT)'
'*-a[set spider argument (may be repeated)]:value pair:(NAME=VALUE)'
'1:spider:_scrapy_spiders'
)
_scrapy_glb_opts $options
;;
edit)
(edit)
local options=(
'1:spider:_scrapy_spiders'
'1:spider:_scrapy_spiders'
)
_scrapy_glb_opts $options
;;
list)
(list)
_scrapy_glb_opts
;;
parse)
(parse)
local options=(
'*-a[set spider argument (may be repeated)]:value pair:(NAME=VALUE)'
'--spider[use this spider without looking for one]:spider:_scrapy_spiders'
'--spider=[use this spider without looking for one]:spider:_scrapy_spiders'
'--pipelines[process items through pipelines]'
"--nolinks[don't show links to follow (extracted requests)]"
"--noitems[don't show scraped items]"
'--nocolour[avoid using pygments to colorize the output]'
{-r,--rules}'[use CrawlSpider rules to discover the callback]'
{-c,--callback=}'[use this callback for parsing, instead looking for a callback]:callback:(CALLBACK)'
{-m,--meta=}'[inject extra meta into the Request, it must be a valid raw json string]:meta:(META)'
{'(--rules)-r','(-r)--rules'}'[use CrawlSpider rules to discover the callback]'
{'(--callback)-c','(-c)--callback'}'[use this callback for parsing, instead looking for a callback]:callback:(CALLBACK)'
{'(--meta)-m','(-m)--meta='}'[inject extra meta into the Request, it must be a valid raw json string]:meta:(META)'
'--cbkwargs=[inject extra callback kwargs into the Request, it must be a valid raw json string]:arguments:(CBKWARGS)'
{-d,--depth=}'[maximum depth for parsing requests (default: 1)]:depth:(DEPTH)'
{-v,--verbose}'[print each depth level one by one]'
{'(--depth)-d','(-d)--depth='}'[maximum depth for parsing requests (default: 1)]:depth:(DEPTH)'
{'(--verbose)-v','(-v)--verbose'}'[print each depth level one by one]'
'1:URL:_httpie_urls'
)
_scrapy_glb_opts $options
@ -134,6 +135,8 @@ _scrapy() {
esac
;;
esac
return ret
}
_scrapy_cmds() {
@ -159,7 +162,7 @@ _scrapy_cmds() {
if [[ $(scrapy -h | grep -s "no active project") == "" ]]; then
commands=(${commands[@]} ${project_commands[@]})
fi
_describe -t common-commands 'common commands' commands
_describe -t common-commands 'common commands' commands && ret=0
}
_scrapy_glb_opts() {
@ -169,13 +172,13 @@ _scrapy_glb_opts() {
'(--nolog)--logfile=[log file. if omitted stderr will be used]:file:_files'
'--pidfile=[write process ID to FILE]:file:_files'
'--profile=[write python cProfile stats to FILE]:file:_files'
'(--nolog)'{-L,--loglevel=}'[log level (default: INFO)]:log level:(DEBUG INFO WARN ERROR)'
{'(--loglevel --nolog)-L','(-L --nolog)--loglevel='}'[log level (default: INFO)]:log level:(DEBUG INFO WARN ERROR)'
'(-L --loglevel --logfile)--nolog[disable logging completely]'
'--pdb[enable pdb on failure]'
'*'{-s,--set=}'[set/override setting (may be repeated)]:value pair:(NAME=VALUE)'
)
options=(${options[@]} "$@")
_arguments $options
_arguments -A "-*" $options && ret=0
}
_httpie_urls() {

182
pytest.ini
View File

@ -8,7 +8,6 @@ addopts =
--ignore=docs/_ext
--ignore=docs/conf.py
--ignore=docs/news.rst
--ignore=docs/topics/developer-tools.rst
--ignore=docs/topics/dynamic-content.rst
--ignore=docs/topics/items.rst
--ignore=docs/topics/leaks.rst
@ -19,7 +18,10 @@ addopts =
--ignore=docs/topics/telnetconsole.rst
--ignore=docs/utils
twisted = 1
markers =
only_asyncio: marks tests as only enabled when --reactor=asyncio is passed
flake8-ignore =
W503
# Files that are only meant to provide top-level imports are expected not
# to use any of their imports:
scrapy/core/downloader/handlers/http.py F401
@ -33,40 +35,40 @@ flake8-ignore =
scrapy/commands/check.py E501
scrapy/commands/crawl.py E501
scrapy/commands/edit.py E501
scrapy/commands/fetch.py E401 E501 E128 E731
scrapy/commands/genspider.py E128 E501 E502
scrapy/commands/parse.py E128 E501 E731 E226
scrapy/commands/fetch.py E401 E501 E128
scrapy/commands/genspider.py E128 E501
scrapy/commands/parse.py E128 E501
scrapy/commands/runspider.py E501
scrapy/commands/settings.py E128
scrapy/commands/shell.py E128 E501 E502
scrapy/commands/shell.py E128 E501
scrapy/commands/startproject.py E127 E501 E128
scrapy/commands/version.py E501 E128
# scrapy/contracts
scrapy/contracts/__init__.py E501 W504
scrapy/contracts/__init__.py E501
scrapy/contracts/default.py E128
# scrapy/core
scrapy/core/engine.py E501 E128 E127 E306 E502
scrapy/core/engine.py E501 E128 E127
scrapy/core/scheduler.py E501
scrapy/core/scraper.py E501 E306 E128 W504
scrapy/core/spidermw.py E501 E731 E126 E226
scrapy/core/scraper.py E501 E128
scrapy/core/spidermw.py E501 E126
scrapy/core/downloader/__init__.py E501
scrapy/core/downloader/contextfactory.py E501 E128 E126
scrapy/core/downloader/middleware.py E501 E502
scrapy/core/downloader/tls.py E501 E305 E241
scrapy/core/downloader/webclient.py E731 E501 E128 E126 E226
scrapy/core/downloader/middleware.py E501
scrapy/core/downloader/tls.py E501
scrapy/core/downloader/webclient.py E501 E128 E126
scrapy/core/downloader/handlers/__init__.py E501
scrapy/core/downloader/handlers/ftp.py E501 E305 E128 E127
scrapy/core/downloader/handlers/ftp.py E501 E128 E127
scrapy/core/downloader/handlers/http10.py E501
scrapy/core/downloader/handlers/http11.py E501
scrapy/core/downloader/handlers/s3.py E501 E128 E126
# scrapy/downloadermiddlewares
scrapy/downloadermiddlewares/ajaxcrawl.py E501 E226
scrapy/downloadermiddlewares/ajaxcrawl.py E501
scrapy/downloadermiddlewares/decompression.py E501
scrapy/downloadermiddlewares/defaultheaders.py E501
scrapy/downloadermiddlewares/httpcache.py E501 E126
scrapy/downloadermiddlewares/httpcompression.py E501 E128
scrapy/downloadermiddlewares/httpproxy.py E501
scrapy/downloadermiddlewares/redirect.py E501 W504
scrapy/downloadermiddlewares/redirect.py E501
scrapy/downloadermiddlewares/retry.py E501 E126
scrapy/downloadermiddlewares/robotstxt.py E501
scrapy/downloadermiddlewares/stats.py E501
@ -74,10 +76,10 @@ flake8-ignore =
scrapy/extensions/closespider.py E501 E128 E123
scrapy/extensions/corestats.py E501
scrapy/extensions/feedexport.py E128 E501
scrapy/extensions/httpcache.py E128 E501 E303
scrapy/extensions/httpcache.py E128 E501
scrapy/extensions/memdebug.py E501
scrapy/extensions/spiderstate.py E501
scrapy/extensions/telnet.py E501 W504
scrapy/extensions/telnet.py E501
scrapy/extensions/throttle.py E501
# scrapy/http
scrapy/http/common.py E501
@ -85,29 +87,30 @@ flake8-ignore =
scrapy/http/request/__init__.py E501
scrapy/http/request/form.py E501 E123
scrapy/http/request/json_request.py E501
scrapy/http/response/__init__.py E501 E128 W293 W291
scrapy/http/response/text.py E501 W293 E128 E124
scrapy/http/response/__init__.py E501 E128
scrapy/http/response/text.py E501 E128 E124
# scrapy/linkextractors
scrapy/linkextractors/__init__.py E731 E501 E402
scrapy/linkextractors/lxmlhtml.py E501 E731 E226
scrapy/linkextractors/__init__.py E501 E402
scrapy/linkextractors/lxmlhtml.py E501
# scrapy/loader
scrapy/loader/__init__.py E501 E128
scrapy/loader/processors.py E501
# scrapy/pipelines
scrapy/pipelines/files.py E116 E501 E266
scrapy/pipelines/images.py E265 E501
scrapy/pipelines/media.py E125 E501 E266
scrapy/pipelines/__init__.py E501
scrapy/pipelines/files.py E116 E501
scrapy/pipelines/images.py E501
scrapy/pipelines/media.py E125 E501
# scrapy/selector
scrapy/selector/__init__.py F403
scrapy/selector/unified.py E501 E111
# scrapy/settings
scrapy/settings/__init__.py E501
scrapy/settings/default_settings.py E501 E114 E116 E226
scrapy/settings/default_settings.py E501 E114 E116
scrapy/settings/deprecated.py E501
# scrapy/spidermiddlewares
scrapy/spidermiddlewares/httperror.py E501
scrapy/spidermiddlewares/offsite.py E501
scrapy/spidermiddlewares/referer.py E501 E129 W503 W504
scrapy/spidermiddlewares/referer.py E501 E129
scrapy/spidermiddlewares/urllength.py E501
# scrapy/spiders
scrapy/spiders/__init__.py E501 E402
@ -115,134 +118,133 @@ flake8-ignore =
scrapy/spiders/feed.py E501
scrapy/spiders/sitemap.py E501
# scrapy/utils
scrapy/utils/asyncio.py E501
scrapy/utils/benchserver.py E501
scrapy/utils/conf.py E402 E501
scrapy/utils/console.py E306 E305
scrapy/utils/datatypes.py E501 E226
scrapy/utils/datatypes.py E501
scrapy/utils/decorators.py E501
scrapy/utils/defer.py E501 E128
scrapy/utils/deprecate.py E128 E501 E127 E502
scrapy/utils/gz.py E305 E501 W504
scrapy/utils/http.py F403 E226
scrapy/utils/deprecate.py E128 E501 E127
scrapy/utils/gz.py E501
scrapy/utils/http.py F403
scrapy/utils/httpobj.py E501
scrapy/utils/iterators.py E501 E701
scrapy/utils/log.py E128 W503
scrapy/utils/markup.py F403 W292
scrapy/utils/misc.py E501 E226
scrapy/utils/multipart.py F403 W292
scrapy/utils/iterators.py E501
scrapy/utils/log.py E128 E501
scrapy/utils/markup.py F403
scrapy/utils/misc.py E501
scrapy/utils/multipart.py F403
scrapy/utils/project.py E501
scrapy/utils/python.py E501
scrapy/utils/reactor.py E226
scrapy/utils/reactor.py E501
scrapy/utils/reqser.py E501
scrapy/utils/request.py E127 E501
scrapy/utils/response.py E501 E128
scrapy/utils/signal.py E501 E128
scrapy/utils/sitemap.py E501
scrapy/utils/spider.py E271 E501
scrapy/utils/spider.py E501
scrapy/utils/ssl.py E501
scrapy/utils/test.py E501
scrapy/utils/url.py E501 F403 E128 F405
# scrapy
scrapy/__init__.py E402 E501
scrapy/_monkeypatches.py W293
scrapy/cmdline.py E501
scrapy/crawler.py E501
scrapy/dupefilters.py E501 E202
scrapy/dupefilters.py E501
scrapy/exceptions.py E501
scrapy/exporters.py E501 E226
scrapy/exporters.py E501
scrapy/interfaces.py E501
scrapy/item.py E501 E128
scrapy/link.py E501
scrapy/logformatter.py E501 W293
scrapy/mail.py E402 E128 E501 E502
scrapy/logformatter.py E501
scrapy/mail.py E402 E128 E501
scrapy/middleware.py E128 E501
scrapy/pqueues.py E501
scrapy/responsetypes.py E128 E501 E305
scrapy/resolver.py E501
scrapy/responsetypes.py E128 E501
scrapy/robotstxt.py E501
scrapy/shell.py E501
scrapy/signalmanager.py E501
scrapy/spiderloader.py E225 F841 E501 E126
scrapy/spiderloader.py F841 E501 E126
scrapy/squeues.py E128
scrapy/statscollectors.py E501
# tests
tests/__init__.py E402 E501
tests/mockserver.py E401 E501 E126 E123
tests/pipelines.py F841 E226
tests/pipelines.py F841
tests/spiders.py E501 E127
tests/test_closespider.py E501 E127
tests/test_command_fetch.py E501
tests/test_command_parse.py E501 E128 E303 E226
tests/test_command_parse.py E501 E128
tests/test_command_shell.py E501 E128
tests/test_commands.py E128 E501
tests/test_contracts.py E501 E128 W293
tests/test_crawl.py E501 E741 E265
tests/test_crawler.py F841 E306 E501
tests/test_dependencies.py F841 E501 E305
tests/test_downloader_handlers.py E124 E127 E128 E225 E265 E501 E701 E126 E226 E123
tests/test_contracts.py E501 E128
tests/test_crawl.py E501 E741
tests/test_crawler.py F841 E501
tests/test_dependencies.py F841 E501
tests/test_downloader_handlers.py E124 E127 E128 E501 E126 E123
tests/test_downloadermiddleware.py E501
tests/test_downloadermiddleware_ajaxcrawlable.py E501
tests/test_downloadermiddleware_cookies.py E731 E741 E501 E128 E303 E265 E126
tests/test_downloadermiddleware_cookies.py E741 E501 E128 E126
tests/test_downloadermiddleware_decompression.py E127
tests/test_downloadermiddleware_defaultheaders.py E501
tests/test_downloadermiddleware_downloadtimeout.py E501
tests/test_downloadermiddleware_httpcache.py E501 E305
tests/test_downloadermiddleware_httpcompression.py E501 E251 E126 E123
tests/test_downloadermiddleware_httpcache.py E501
tests/test_downloadermiddleware_httpcompression.py E501 E126 E123
tests/test_downloadermiddleware_httpproxy.py E501 E128
tests/test_downloadermiddleware_redirect.py E501 E303 E128 E306 E127 E305
tests/test_downloadermiddleware_retry.py E501 E128 W293 E251 E303 E126
tests/test_downloadermiddleware_redirect.py E501 E128 E127
tests/test_downloadermiddleware_retry.py E501 E128 E126
tests/test_downloadermiddleware_robotstxt.py E501
tests/test_downloadermiddleware_stats.py E501
tests/test_dupefilters.py E221 E501 E741 W293 W291 E128 E124
tests/test_dupefilters.py E501 E741 E128 E124
tests/test_engine.py E401 E501 E128
tests/test_exporters.py E501 E731 E306 E128 E124
tests/test_exporters.py E501 E128 E124
tests/test_extension_telnet.py F841
tests/test_feedexport.py E501 F841 E241
tests/test_feedexport.py E501 F841
tests/test_http_cookies.py E501
tests/test_http_headers.py E501
tests/test_http_request.py E402 E501 E127 E128 W293 E128 E126 E123
tests/test_http_response.py E501 E301 E128 E265
tests/test_item.py E701 E128 F841 E306
tests/test_http_request.py E402 E501 E127 E128 E128 E126 E123
tests/test_http_response.py E501 E128
tests/test_item.py E128 F841
tests/test_link.py E501
tests/test_linkextractors.py E501 E128 E124
tests/test_loader.py E501 E731 E303 E741 E128 E117 E241
tests/test_loader.py E501 E741 E128 E117
tests/test_logformatter.py E128 E501 E122
tests/test_mail.py E128 E501 E305
tests/test_mail.py E128 E501
tests/test_middleware.py E501 E128
tests/test_pipeline_crawl.py E131 E501 E128 E126
tests/test_pipeline_files.py E501 W293 E303 E272 E226
tests/test_pipeline_images.py F841 E501 E303
tests/test_pipeline_media.py E501 E741 E731 E128 E306 E502
tests/test_pipeline_crawl.py E501 E128 E126
tests/test_pipeline_files.py E501
tests/test_pipeline_images.py F841 E501
tests/test_pipeline_media.py E501 E741 E128
tests/test_proxy_connect.py E501 E741
tests/test_request_cb_kwargs.py E501
tests/test_responsetypes.py E501 E305
tests/test_robotstxt_interface.py E501 W291 E501
tests/test_responsetypes.py E501
tests/test_robotstxt_interface.py E501 E501
tests/test_scheduler.py E501 E126 E123
tests/test_selector.py E501 E127
tests/test_spider.py E501
tests/test_spidermiddleware.py E501 E226
tests/test_spidermiddleware.py E501
tests/test_spidermiddleware_httperror.py E128 E501 E127 E121
tests/test_spidermiddleware_offsite.py E501 E128 E111 W293
tests/test_spidermiddleware_output_chain.py E501 W293 E226
tests/test_spidermiddleware_referer.py E501 F841 E125 E201 E124 E501 E241 E121
tests/test_squeues.py E501 E701 E741
tests/test_utils_conf.py E501 E303 E128
tests/test_spidermiddleware_offsite.py E501 E128 E111
tests/test_spidermiddleware_output_chain.py E501
tests/test_spidermiddleware_referer.py E501 F841 E125 E124 E501 E121
tests/test_squeues.py E501 E741
tests/test_utils_asyncio.py E501
tests/test_utils_conf.py E501 E128
tests/test_utils_curl.py E501
tests/test_utils_datatypes.py E402 E501 E305
tests/test_utils_defer.py E306 E501 F841 E226
tests/test_utils_deprecate.py F841 E306 E501
tests/test_utils_http.py E501 E128 W504
tests/test_utils_iterators.py E501 E128 E129 E303 E241
tests/test_utils_log.py E741 E226
tests/test_utils_python.py E501 E303 E731 E701 E305
tests/test_utils_datatypes.py E402 E501
tests/test_utils_defer.py E501 F841
tests/test_utils_deprecate.py F841 E501
tests/test_utils_http.py E501 E128
tests/test_utils_iterators.py E501 E128 E129
tests/test_utils_log.py E741
tests/test_utils_python.py E501
tests/test_utils_reqser.py E501 E128
tests/test_utils_request.py E501 E128 E305
tests/test_utils_request.py E501 E128
tests/test_utils_response.py E501
tests/test_utils_signal.py E741 F841 E731 E226
tests/test_utils_signal.py E741 F841
tests/test_utils_sitemap.py E128 E501 E124
tests/test_utils_spider.py E305
tests/test_utils_template.py E305
tests/test_utils_url.py E501 E127 E305 E211 E125 E501 E226 E241 E126 E123
tests/test_webclient.py E501 E128 E122 E303 E402 E306 E226 E241 E123 E126
tests/test_utils_url.py E501 E127 E125 E501 E126 E123
tests/test_webclient.py E501 E128 E122 E402 E123 E126
tests/test_cmdline/__init__.py E501
tests/test_settings/__init__.py E501 E128
tests/test_spiderloader/__init__.py E128 E501

2
scrapy/VERSION
View File

@ -1 +1 @@
1.8.0
2.1.0

2
scrapy/cmdline.py
View File

@ -12,7 +12,6 @@ from scrapy.exceptions import UsageError
from scrapy.utils.misc import walk_modules
from scrapy.utils.project import inside_project, get_project_settings
from scrapy.utils.python import garbage_collect
from scrapy.settings.deprecated import check_deprecated_settings
def _iter_command_classes(module_name):
@ -118,7 +117,6 @@ def execute(argv=None, settings=None):
pass
else:
settings['EDITOR'] = editor
check_deprecated_settings(settings)
inproject = inside_project()
cmds = _get_commands_dict(settings, inproject)

5
scrapy/commands/__init__.py
View File

@ -9,7 +9,7 @@ from scrapy.utils.conf import arglist_to_dict
from scrapy.exceptions import UsageError
class ScrapyCommand(object):
class ScrapyCommand:
requires_project = False
crawler_process = None
@ -23,7 +23,8 @@ class ScrapyCommand(object):
self.settings = None # set in scrapy.cmdline
def set_crawler(self, crawler):
assert not hasattr(self, '_crawler'), "crawler already set"
if hasattr(self, '_crawler'):
raise RuntimeError("crawler already set")
self._crawler = crawler
def syntax(self):

2
scrapy/commands/bench.py
View File

@ -25,7 +25,7 @@ class Command(ScrapyCommand):
self.crawler_process.start()
class _BenchServer(object):
class _BenchServer:
def __enter__(self):
from scrapy.utils.test import get_testenv

34
scrapy/commands/crawl.py
View File

@ -1,7 +1,5 @@
import os
from scrapy.commands import ScrapyCommand
from scrapy.utils.conf import arglist_to_dict
from scrapy.utils.python import without_none_values
from scrapy.utils.conf import arglist_to_dict, feed_process_params_from_cli
from scrapy.exceptions import UsageError
@ -19,7 +17,7 @@ class Command(ScrapyCommand):
ScrapyCommand.add_options(self, parser)
parser.add_option("-a", dest="spargs", action="append", default=[], metavar="NAME=VALUE",
help="set spider argument (may be repeated)")
parser.add_option("-o", "--output", metavar="FILE",
parser.add_option("-o", "--output", metavar="FILE", action="append",
help="dump scraped items into FILE (use - for stdout)")
parser.add_option("-t", "--output-format", metavar="FORMAT",
help="format to use for dumping items with -o")
@ -31,21 +29,8 @@ class Command(ScrapyCommand):
except ValueError:
raise UsageError("Invalid -a value, use -a NAME=VALUE", print_help=False)
if opts.output:
if opts.output == '-':
self.settings.set('FEED_URI', 'stdout:', priority='cmdline')
else:
self.settings.set('FEED_URI', opts.output, priority='cmdline')
feed_exporters = without_none_values(
self.settings.getwithbase('FEED_EXPORTERS'))
valid_output_formats = feed_exporters.keys()
if not opts.output_format:
opts.output_format = os.path.splitext(opts.output)[1].replace(".", "")
if opts.output_format not in valid_output_formats:
raise UsageError("Unrecognized output format '%s', set one"
" using the '-t' switch or as a file extension"
" from the supported list %s" % (opts.output_format,
tuple(valid_output_formats)))
self.settings.set('FEED_FORMAT', opts.output_format, priority='cmdline')
feeds = feed_process_params_from_cli(self.settings, opts.output, opts.output_format)
self.settings.set('FEEDS', feeds, priority='cmdline')
def run(self, args, opts):
if len(args) < 1:
@ -54,8 +39,13 @@ class Command(ScrapyCommand):
raise UsageError("running 'scrapy crawl' with more than one spider is no longer supported")
spname = args[0]
self.crawler_process.crawl(spname, **opts.spargs)
self.crawler_process.start()
crawl_defer = self.crawler_process.crawl(spname, **opts.spargs)
if self.crawler_process.bootstrap_failed:
if getattr(crawl_defer, 'result', None) is not None and issubclass(crawl_defer.result.type, Exception):
self.exitcode = 1
else:
self.crawler_process.start()
if self.crawler_process.bootstrap_failed or \
(hasattr(self.crawler_process, 'has_exception') and self.crawler_process.has_exception):
self.exitcode = 1

4
scrapy/commands/fetch.py
View File

@ -49,8 +49,8 @@ class Command(ScrapyCommand):
def run(self, args, opts):
if len(args) != 1 or not is_url(args[0]):
raise UsageError()
cb = lambda x: self._print_response(x, opts)
request = Request(args[0], callback=cb, dont_filter=True)
request = Request(args[0], callback=self._print_response,
cb_kwargs={"opts": opts}, dont_filter=True)
# by default, let the framework handle redirects,
# i.e. command handles all codes expect 3xx
if not opts.no_redirect:

7
scrapy/commands/genspider.py
View File

@ -90,8 +90,7 @@ class Command(ScrapyCommand):
'module': module,
'name': name,
'domain': domain,
'classname': '%sSpider' % ''.join(s.capitalize() \
for s in module.split('_'))
'classname': '%sSpider' % ''.join(s.capitalize() for s in module.split('_'))
}
if self.settings.get('NEWSPIDER_MODULE'):
spiders_module = import_module(self.settings['NEWSPIDER_MODULE'])
@ -102,8 +101,8 @@ class Command(ScrapyCommand):
spider_file = "%s.py" % join(spiders_dir, module)
shutil.copyfile(template_file, spider_file)
render_templatefile(spider_file, **tvars)
print("Created spider %r using template %r " % (name, \
template_name), end=('' if spiders_module else '\n'))
print("Created spider %r using template %r "
% (name, template_name), end=('' if spiders_module else '\n'))
if spiders_module:
print("in module:\n %s.%s" % (spiders_module.__name__, module))

11
scrapy/commands/parse.py
View File

@ -80,7 +80,7 @@ class Command(ScrapyCommand):
else:
items = self.items.get(lvl, [])
print("# Scraped Items ", "-"*60)
print("# Scraped Items ", "-" * 60)
display.pprint([dict(x) for x in items], colorize=colour)
def print_requests(self, lvl=None, colour=True):
@ -92,14 +92,14 @@ class Command(ScrapyCommand):
else:
requests = self.requests.get(lvl, [])
print("# Requests ", "-"*65)
print("# Requests ", "-" * 65)
display.pprint(requests, colorize=colour)
def print_results(self, opts):
colour = not opts.nocolour
if opts.verbose:
for level in range(1, self.max_level+1):
for level in range(1, self.max_level + 1):
print('\n>>> DEPTH LEVEL: %s <<<' % level)
if not opts.noitems:
self.print_items(level, colour)
@ -146,9 +146,8 @@ class Command(ScrapyCommand):
if not self.spidercls:
logger.error('Unable to find spider for: %(url)s', {'url': url})
# Request requires callback argument as callable or None, not string
request = Request(url, None)
_start_requests = lambda s: [self.prepare_request(s, request, opts)]
def _start_requests(spider):
yield self.prepare_request(spider, Request(url), opts)
self.spidercls.start_requests = _start_requests
def start_parsing(self, url, opts):

20
scrapy/commands/runspider.py
View File

@ -5,8 +5,7 @@ from importlib import import_module
from scrapy.utils.spider import iter_spider_classes
from scrapy.commands import ScrapyCommand
from scrapy.exceptions import UsageError
from scrapy.utils.conf import arglist_to_dict
from scrapy.utils.python import without_none_values
from scrapy.utils.conf import arglist_to_dict, feed_process_params_from_cli
def _import_file(filepath):
@ -43,7 +42,7 @@ class Command(ScrapyCommand):
ScrapyCommand.add_options(self, parser)
parser.add_option("-a", dest="spargs", action="append", default=[], metavar="NAME=VALUE",
help="set spider argument (may be repeated)")
parser.add_option("-o", "--output", metavar="FILE",
parser.add_option("-o", "--output", metavar="FILE", action="append",
help="dump scraped items into FILE (use - for stdout)")
parser.add_option("-t", "--output-format", metavar="FORMAT",
help="format to use for dumping items with -o")
@ -55,19 +54,8 @@ class Command(ScrapyCommand):
except ValueError:
raise UsageError("Invalid -a value, use -a NAME=VALUE", print_help=False)
if opts.output:
if opts.output == '-':
self.settings.set('FEED_URI', 'stdout:', priority='cmdline')
else:
self.settings.set('FEED_URI', opts.output, priority='cmdline')
feed_exporters = without_none_values(self.settings.getwithbase('FEED_EXPORTERS'))
if not opts.output_format:
opts.output_format = os.path.splitext(opts.output)[1].replace(".", "")
if opts.output_format not in feed_exporters:
raise UsageError("Unrecognized output format '%s', set one"
" using the '-t' switch or as a file extension"
" from the supported list %s" % (opts.output_format,
tuple(feed_exporters)))
self.settings.set('FEED_FORMAT', opts.output_format, priority='cmdline')
feeds = feed_process_params_from_cli(self.settings, opts.output, opts.output_format)
self.settings.set('FEEDS', feeds, priority='cmdline')
def run(self, args, opts):
if len(args) != 1:

4
scrapy/commands/shell.py
View File

@ -6,8 +6,8 @@ See documentation in docs/topics/shell.rst
from threading import Thread
from scrapy.commands import ScrapyCommand
from scrapy.shell import Shell
from scrapy.http import Request
from scrapy.shell import Shell
from scrapy.utils.spider import spidercls_for_request, DefaultSpider
from scrapy.utils.url import guess_scheme
@ -37,7 +37,7 @@ class Command(ScrapyCommand):
help="evaluate the code in the shell, print the result and exit")
parser.add_option("--spider", dest="spider",
help="use this spider")
parser.add_option("--no-redirect", dest="no_redirect", action="store_true", \
parser.add_option("--no-redirect", dest="no_redirect", action="store_true",
default=False, help="do not handle HTTP 3xx status codes and print response as-is")
def update_vars(self, vars):

8
scrapy/contracts/__init__.py
View File

@ -9,7 +9,7 @@ from scrapy.utils.spider import iterate_spider_output
from scrapy.utils.python import get_spec
class ContractsManager(object):
class ContractsManager:
contracts = {}
def __init__(self, contracts):
@ -17,10 +17,10 @@ class ContractsManager(object):
self.contracts[contract.name] = contract
def tested_methods_from_spidercls(self, spidercls):
is_method = re.compile(r"^\s*@", re.MULTILINE).search
methods = []
for key, value in getmembers(spidercls):
if (callable(value) and value.__doc__ and
re.search(r'^\s*@', value.__doc__, re.MULTILINE)):
if callable(value) and value.__doc__ and is_method(value.__doc__):
methods.append(key)
return methods
@ -107,7 +107,7 @@ class ContractsManager(object):
request.errback = eb_wrapper
class Contract(object):
class Contract:
""" Abstract class for contracts """
request_cls = None

6
scrapy/contracts/default.py
View File

@ -58,7 +58,11 @@ class ReturnsContract(Contract):
def __init__(self, *args, **kwargs):
super(ReturnsContract, self).__init__(*args, **kwargs)
assert len(self.args) in [1, 2, 3]
if len(self.args) not in [1, 2, 3]:
raise ValueError(
"Incorrect argument quantity: expected 1, 2 or 3, got %i"
% len(self.args)
)
self.obj_name = self.args[0] or None
self.obj_type = self.objects[self.obj_name]

12
scrapy/core/downloader/__init__.py
View File

@ -3,7 +3,7 @@ from time import time
from datetime import datetime
from collections import deque
from twisted.internet import reactor, defer, task
from twisted.internet import defer, task
from scrapy.utils.defer import mustbe_deferred
from scrapy.utils.httpobj import urlparse_cached
@ -13,7 +13,7 @@ from scrapy.core.downloader.middleware import DownloaderMiddlewareManager
from scrapy.core.downloader.handlers import DownloadHandlers
class Slot(object):
class Slot:
"""Downloader slot"""
def __init__(self, concurrency, delay, randomize_delay):
@ -66,7 +66,7 @@ def _get_concurrency_delay(concurrency, spider, settings):
return concurrency, delay
class Downloader(object):
class Downloader:
DOWNLOAD_SLOT = 'download_slot'
@ -133,6 +133,7 @@ class Downloader(object):
return deferred
def _process_queue(self, spider, slot):
from twisted.internet import reactor
if slot.latercall and slot.latercall.active():
return
@ -172,7 +173,7 @@ class Downloader(object):
return response
dfd.addCallback(_downloaded)
# 3. After response arrives, remove the request from transferring
# 3. After response arrives, remove the request from transferring
# state to free up the transferring slot so it can be used by the
# following requests (perhaps those which came from the downloader
# middleware itself)
@ -181,6 +182,9 @@ class Downloader(object):
def finish_transferring(_):
slot.transferring.remove(request)
self._process_queue(spider, slot)
self.signals.send_catch_log(signal=signals.request_left_downloader,
request=request,
spider=spider)
return _
return dfd.addBoth(finish_transferring)

16
scrapy/core/downloader/handlers/__init__.py
View File

@ -4,17 +4,17 @@ import logging
from twisted.internet import defer
from scrapy.exceptions import NotSupported, NotConfigured
from scrapy.utils.httpobj import urlparse_cached
from scrapy.utils.misc import load_object
from scrapy.utils.python import without_none_values
from scrapy import signals
from scrapy.exceptions import NotConfigured, NotSupported
from scrapy.utils.httpobj import urlparse_cached
from scrapy.utils.misc import create_instance, load_object
from scrapy.utils.python import without_none_values
logger = logging.getLogger(__name__)
class DownloadHandlers(object):
class DownloadHandlers:
def __init__(self, crawler):
self._crawler = crawler
@ -49,7 +49,11 @@ class DownloadHandlers(object):
dhcls = load_object(path)
if skip_lazy and getattr(dhcls, 'lazy', True):
return None
dh = dhcls(self._crawler.settings)
dh = create_instance(
objcls=dhcls,
settings=self._crawler.settings,
crawler=self._crawler,
)
except NotConfigured as ex:
self._notconfigured[scheme] = str(ex)
return None

5
scrapy/core/downloader/handlers/datauri.py
View File

@ -5,12 +5,9 @@ from scrapy.responsetypes import responsetypes
from scrapy.utils.decorators import defers
class DataURIDownloadHandler(object):
class DataURIDownloadHandler:
lazy = False
def __init__(self, settings):
super(DataURIDownloadHandler, self).__init__()
@defers
def download_request(self, request, spider):
uri = parse_data_uri(request.url)

6
scrapy/core/downloader/handlers/file.py
View File

@ -1,14 +1,12 @@
from w3lib.url import file_uri_to_path
from scrapy.responsetypes import responsetypes
from scrapy.utils.decorators import defers
class FileDownloadHandler(object):
class FileDownloadHandler:
lazy = False
def __init__(self, settings):
pass
@defers
def download_request(self, request, spider):
filepath = file_uri_to_path(request.url)

13
scrapy/core/downloader/handlers/ftp.py
View File

@ -32,9 +32,8 @@ import re
from io import BytesIO
from urllib.parse import unquote
from twisted.internet import reactor
from twisted.protocols.ftp import FTPClient, CommandFailed
from twisted.internet.protocol import Protocol, ClientCreator
from twisted.internet.protocol import ClientCreator, Protocol
from twisted.protocols.ftp import CommandFailed, FTPClient
from scrapy.http import Response
from scrapy.responsetypes import responsetypes
@ -59,10 +58,11 @@ class ReceivedDataProtocol(Protocol):
def close(self):
self.body.close() if self.filename else self.body.seek(0)
_CODE_RE = re.compile(r"\d+")
class FTPDownloadHandler(object):
class FTPDownloadHandler:
lazy = False
CODE_MAPPING = {
@ -75,7 +75,12 @@ class FTPDownloadHandler(object):
self.default_password = settings['FTP_PASSWORD']
self.passive_mode = settings['FTP_PASSIVE_MODE']
@classmethod
def from_crawler(cls, crawler):
return cls(crawler.settings)
def download_request(self, request, spider):
from twisted.internet import reactor
parsed_url = urlparse_cached(request)
user = request.meta.get("ftp_user", self.default_user)
password = request.meta.get("ftp_password", self.default_password)

19
scrapy/core/downloader/handlers/http10.py
View File

@ -1,17 +1,21 @@
"""Download handlers for http and https schemes
"""
from twisted.internet import reactor
from scrapy.utils.misc import load_object, create_instance
from scrapy.utils.misc import create_instance, load_object
from scrapy.utils.python import to_unicode
class HTTP10DownloadHandler(object):
class HTTP10DownloadHandler:
lazy = False
def __init__(self, settings):
def __init__(self, settings, crawler=None):
self.HTTPClientFactory = load_object(settings['DOWNLOADER_HTTPCLIENTFACTORY'])
self.ClientContextFactory = load_object(settings['DOWNLOADER_CLIENTCONTEXTFACTORY'])
self._settings = settings
self._crawler = crawler
@classmethod
def from_crawler(cls, crawler):
return cls(crawler.settings, crawler)
def download_request(self, request, spider):
"""Return a deferred for the HTTP download"""
@ -20,9 +24,14 @@ class HTTP10DownloadHandler(object):
return factory.deferred
def _connect(self, factory):
from twisted.internet import reactor
host, port = to_unicode(factory.host), factory.port
if factory.scheme == b'https':
client_context_factory = create_instance(self.ClientContextFactory, settings=self._settings, crawler=None)
client_context_factory = create_instance(
objcls=self.ClientContextFactory,
settings=self._settings,
crawler=self._crawler,
)
return reactor.connectSSL(host, port, factory, client_context_factory)
else:
return reactor.connectTCP(host, port, factory)

118
scrapy/core/downloader/handlers/http11.py
View File

@ -1,37 +1,40 @@
"""Download handlers for http and https schemes"""
import re
import ipaddress
import logging
import re
import warnings
from contextlib import suppress
from io import BytesIO
from time import time
from urllib.parse import urldefrag
from zope.interface import implementer
from twisted.internet import defer, reactor, protocol
from twisted.internet import defer, protocol, ssl
from twisted.internet.endpoints import TCP4ClientEndpoint
from twisted.internet.error import TimeoutError
from twisted.web.client import Agent, HTTPConnectionPool, ResponseDone, ResponseFailed, URI
from twisted.web.http import _DataLoss, PotentialDataLoss
from twisted.web.http_headers import Headers as TxHeaders
from twisted.web.iweb import IBodyProducer, UNKNOWN_LENGTH
from twisted.internet.error import TimeoutError
from twisted.web.http import _DataLoss, PotentialDataLoss
from twisted.web.client import Agent, ResponseDone, HTTPConnectionPool, ResponseFailed, URI
from twisted.internet.endpoints import TCP4ClientEndpoint
from zope.interface import implementer
from scrapy.core.downloader.tls import openssl_methods
from scrapy.core.downloader.webclient import _parse
from scrapy.exceptions import ScrapyDeprecationWarning
from scrapy.http import Headers
from scrapy.responsetypes import responsetypes
from scrapy.core.downloader.webclient import _parse
from scrapy.core.downloader.tls import openssl_methods
from scrapy.utils.misc import load_object, create_instance
from scrapy.utils.misc import create_instance, load_object
from scrapy.utils.python import to_bytes, to_unicode
logger = logging.getLogger(__name__)
class HTTP11DownloadHandler(object):
class HTTP11DownloadHandler:
lazy = False
def __init__(self, settings):
def __init__(self, settings, crawler=None):
from twisted.internet import reactor
self._pool = HTTPConnectionPool(reactor, persistent=True)
self._pool.maxPersistentPerHost = settings.getint('CONCURRENT_REQUESTS_PER_DOMAIN')
self._pool._factory.noisy = False
@ -41,17 +44,17 @@ class HTTP11DownloadHandler(object):
# try method-aware context factory
try:
self._contextFactory = create_instance(
self._contextFactoryClass,
objcls=self._contextFactoryClass,
settings=settings,
crawler=None,
crawler=crawler,
method=self._sslMethod,
)
except TypeError:
# use context factory defaults
self._contextFactory = create_instance(
self._contextFactoryClass,
objcls=self._contextFactoryClass,
settings=settings,
crawler=None,
crawler=crawler,
)
msg = """
'%s' does not accept `method` argument (type OpenSSL.SSL method,\
@ -64,6 +67,10 @@ class HTTP11DownloadHandler(object):
self._fail_on_dataloss = settings.getbool('DOWNLOAD_FAIL_ON_DATALOSS')
self._disconnect_timeout = 1
@classmethod
def from_crawler(cls, crawler):
return cls(crawler.settings, crawler)
def download_request(self, request, spider):
"""Return a deferred for the HTTP download"""
agent = ScrapyAgent(
@ -76,6 +83,7 @@ class HTTP11DownloadHandler(object):
return agent.download_request(request)
def close(self):
from twisted.internet import reactor
d = self._pool.closeCachedConnections()
# closeCachedConnections will hang on network or server issues, so
# we'll manually timeout the deferred.
@ -261,7 +269,7 @@ class ScrapyProxyAgent(Agent):
)
class ScrapyAgent(object):
class ScrapyAgent:
_Agent = Agent
_ProxyAgent = ScrapyProxyAgent
@ -279,6 +287,7 @@ class ScrapyAgent(object):
self._txresponse = None
def _get_agent(self, request, timeout):
from twisted.internet import reactor
bindaddress = request.meta.get('bindaddress') or self._bindAddress
proxy = request.meta.get('proxy')
if proxy:
@ -321,6 +330,7 @@ class ScrapyAgent(object):
)
def download_request(self, request):
from twisted.internet import reactor
timeout = request.meta.get('download_timeout') or self._connectTimeout
agent = self._get_agent(request, timeout)
@ -332,20 +342,6 @@ class ScrapyAgent(object):
headers.removeHeader(b'Proxy-Authorization')
if request.body:
bodyproducer = _RequestBodyProducer(request.body)
elif method == b'POST':
# Setting Content-Length: 0 even for POST requests is not a
# MUST per HTTP RFCs, but it's common behavior, and some
# servers require this, otherwise returning HTTP 411 Length required
#
# RFC 7230#section-3.3.2:
# "a Content-Length header field is normally sent in a POST
# request even when the value is 0 (indicating an empty payload body)."
#
# Twisted < 17 will not add "Content-Length: 0" by itself;
# Twisted >= 17 fixes this;
# Using a producer with an empty-string sends `0` as Content-Length
# for all versions of Twisted.
bodyproducer = _RequestBodyProducer(b'')
else:
bodyproducer = None
start_time = time()
@ -378,7 +374,13 @@ class ScrapyAgent(object):
def _cb_bodyready(self, txresponse, request):
# deliverBody hangs for responses without body
if txresponse.length == 0:
return txresponse, b'', None
return {
"txresponse": txresponse,
"body": b"",
"flags": None,
"certificate": None,
"ip_address": None,
}
maxsize = request.meta.get('download_maxsize', self._maxsize)
warnsize = request.meta.get('download_warnsize', self._warnsize)
@ -414,15 +416,21 @@ class ScrapyAgent(object):
return d
def _cb_bodydone(self, result, request, url):
txresponse, body, flags = result
status = int(txresponse.code)
headers = Headers(txresponse.headers.getAllRawHeaders())
respcls = responsetypes.from_args(headers=headers, url=url, body=body)
return respcls(url=url, status=status, headers=headers, body=body, flags=flags)
headers = Headers(result["txresponse"].headers.getAllRawHeaders())
respcls = responsetypes.from_args(headers=headers, url=url, body=result["body"])
return respcls(
url=url,
status=int(result["txresponse"].code),
headers=headers,
body=result["body"],
flags=result["flags"],
certificate=result["certificate"],
ip_address=result["ip_address"],
)
@implementer(IBodyProducer)
class _RequestBodyProducer(object):
class _RequestBodyProducer:
def __init__(self, body):
self.body = body
@ -452,6 +460,16 @@ class _ResponseReader(protocol.Protocol):
self._fail_on_dataloss_warned = False
self._reached_warnsize = False
self._bytes_received = 0
self._certificate = None
self._ip_address = None
def connectionMade(self):
if self._certificate is None:
with suppress(AttributeError):
self._certificate = ssl.Certificate(self.transport._producer.getPeerCertificate())
if self._ip_address is None:
self._ip_address = ipaddress.ip_address(self.transport._producer.getPeer().host)
def dataReceived(self, bodyBytes):
# This maybe called several times after cancel was called with buffered data.
@ -484,16 +502,34 @@ class _ResponseReader(protocol.Protocol):
body = self._bodybuf.getvalue()
if reason.check(ResponseDone):
self._finished.callback((self._txresponse, body, None))
self._finished.callback({
"txresponse": self._txresponse,
"body": body,
"flags": None,
"certificate": self._certificate,
"ip_address": self._ip_address,
})
return
if reason.check(PotentialDataLoss):
self._finished.callback((self._txresponse, body, ['partial']))
self._finished.callback({
"txresponse": self._txresponse,
"body": body,
"flags": ["partial"],
"certificate": self._certificate,
"ip_address": self._ip_address,
})
return
if reason.check(ResponseFailed) and any(r.check(_DataLoss) for r in reason.value.reasons):
if not self._fail_on_dataloss:
self._finished.callback((self._txresponse, body, ['dataloss']))
self._finished.callback({
"txresponse": self._txresponse,
"body": body,
"flags": ["dataloss"],
"certificate": self._certificate,
"ip_address": self._ip_address,
})
return
elif not self._fail_on_dataloss_warned:

25
scrapy/core/downloader/handlers/s3.py
View File

@ -1,9 +1,10 @@
from urllib.parse import unquote
from scrapy.exceptions import NotConfigured
from scrapy.utils.httpobj import urlparse_cached
from scrapy.utils.boto import is_botocore
from scrapy.core.downloader.handlers.http import HTTPDownloadHandler
from scrapy.exceptions import NotConfigured
from scrapy.utils.boto import is_botocore
from scrapy.utils.httpobj import urlparse_cached
from scrapy.utils.misc import create_instance
def _get_boto_connection():
@ -30,11 +31,12 @@ def _get_boto_connection():
return _S3Connection
class S3DownloadHandler(object):
class S3DownloadHandler:
def __init__(self, settings, aws_access_key_id=None, aws_secret_access_key=None,
def __init__(self, settings, *,
crawler=None,
aws_access_key_id=None, aws_secret_access_key=None,
httpdownloadhandler=HTTPDownloadHandler, **kw):
if not aws_access_key_id:
aws_access_key_id = settings['AWS_ACCESS_KEY_ID']
if not aws_secret_access_key:
@ -67,7 +69,16 @@ class S3DownloadHandler(object):
except Exception as ex:
raise NotConfigured(str(ex))
self._download_http = httpdownloadhandler(settings).download_request
_http_handler = create_instance(
objcls=httpdownloadhandler,
settings=settings,
crawler=crawler,
)
self._download_http = _http_handler.download_request
@classmethod
def from_crawler(cls, crawler, **kwargs):
return cls(crawler.settings, crawler=crawler, **kwargs)
def download_request(self, request, spider):
p = urlparse_cached(request)

49
scrapy/core/downloader/middleware.py
View File

@ -8,7 +8,7 @@ from twisted.internet import defer
from scrapy.exceptions import _InvalidOutput
from scrapy.http import Request, Response
from scrapy.middleware import MiddlewareManager
from scrapy.utils.defer import mustbe_deferred
from scrapy.utils.defer import mustbe_deferred, deferred_from_coro
from scrapy.utils.conf import build_component_list
@ -33,40 +33,47 @@ class DownloaderMiddlewareManager(MiddlewareManager):
@defer.inlineCallbacks
def process_request(request):
for method in self.methods['process_request']:
response = yield method(request=request, spider=spider)
response = yield deferred_from_coro(method(request=request, spider=spider))
if response is not None and not isinstance(response, (Response, Request)):
raise _InvalidOutput('Middleware %s.process_request must return None, Response or Request, got %s' % \
(method.__self__.__class__.__name__, response.__class__.__name__))
raise _InvalidOutput(
"Middleware %s.process_request must return None, Response or Request, got %s"
% (method.__self__.__class__.__name__, response.__class__.__name__)
)
if response:
defer.returnValue(response)
defer.returnValue((yield download_func(request=request, spider=spider)))
return response
return (yield download_func(request=request, spider=spider))
@defer.inlineCallbacks
def process_response(response):
assert response is not None, 'Received None in process_response'
if isinstance(response, Request):
defer.returnValue(response)
if response is None:
raise TypeError("Received None in process_response")
elif isinstance(response, Request):
return response
for method in self.methods['process_response']:
response = yield method(request=request, response=response, spider=spider)
response = yield deferred_from_coro(method(request=request, response=response, spider=spider))
if not isinstance(response, (Response, Request)):
raise _InvalidOutput('Middleware %s.process_response must return Response or Request, got %s' % \
(method.__self__.__class__.__name__, type(response)))
raise _InvalidOutput(
"Middleware %s.process_response must return Response or Request, got %s"
% (method.__self__.__class__.__name__, type(response))
)
if isinstance(response, Request):
defer.returnValue(response)
defer.returnValue(response)
return response
return response
@defer.inlineCallbacks
def process_exception(_failure):
exception = _failure.value
def process_exception(failure):
exception = failure.value
for method in self.methods['process_exception']:
response = yield method(request=request, exception=exception, spider=spider)
response = yield deferred_from_coro(method(request=request, exception=exception, spider=spider))
if response is not None and not isinstance(response, (Response, Request)):
raise _InvalidOutput('Middleware %s.process_exception must return None, Response or Request, got %s' % \
(method.__self__.__class__.__name__, type(response)))
raise _InvalidOutput(
"Middleware %s.process_exception must return None, Response or Request, got %s"
% (method.__self__.__class__.__name__, type(response))
)
if response:
defer.returnValue(response)
defer.returnValue(_failure)
return response
return failure
deferred = mustbe_deferred(process_request, request)
deferred.addErrback(process_exception)

5
scrapy/core/downloader/tls.py
View File

@ -20,8 +20,8 @@ METHOD_TLSv12 = 'TLSv1.2'
openssl_methods = {
METHOD_TLS: SSL.SSLv23_METHOD, # protocol negotiation (recommended)
METHOD_SSLv3: SSL.SSLv3_METHOD, # SSL 3 (NOT recommended)
METHOD_TLS: SSL.SSLv23_METHOD, # protocol negotiation (recommended)
METHOD_SSLv3: SSL.SSLv3_METHOD, # SSL 3 (NOT recommended)
METHOD_TLSv10: SSL.TLSv1_METHOD, # TLS 1.0 only
METHOD_TLSv11: getattr(SSL, 'TLSv1_1_METHOD', 5), # TLS 1.1 only
METHOD_TLSv12: getattr(SSL, 'TLSv1_2_METHOD', 6), # TLS 1.2 only
@ -89,4 +89,5 @@ class ScrapyClientTLSOptions(ClientTLSOptions):
'from host "{}" (exception: {})'.format(
self._hostnameASCII, repr(e)))
DEFAULT_CIPHERS = AcceptableCiphers.fromOpenSSLCipherString('DEFAULT')

11
scrapy/core/downloader/webclient.py
View File

@ -14,13 +14,12 @@ from scrapy.responsetypes import responsetypes
def _parsed_url_args(parsed):
# Assume parsed is urlparse-d from Request.url,
# which was passed via safe_url_string and is ascii-only.
b = lambda s: to_bytes(s, encoding='ascii')
path = urlunparse(('', '', parsed.path or '/', parsed.params, parsed.query, ''))
path = b(path)
host = b(parsed.hostname)
path = to_bytes(path, encoding="ascii")
host = to_bytes(parsed.hostname, encoding="ascii")
port = parsed.port
scheme = b(parsed.scheme)
netloc = b(parsed.netloc)
scheme = to_bytes(parsed.scheme, encoding="ascii")
netloc = to_bytes(parsed.netloc, encoding="ascii")
if port is None:
port = 443 if scheme == b'https' else 80
return scheme, netloc, host, port, path
@ -140,7 +139,7 @@ class ScrapyHTTPClientFactory(HTTPClientFactory):
self.headers['Content-Length'] = 0
def _build_response(self, body, request):
request.meta['download_latency'] = self.headers_time-self.start_time
request.meta['download_latency'] = self.headers_time - self.start_time
status = int(self.status)
headers = Headers(self.response_headers)
respcls = responsetypes.from_args(headers=headers, url=self._url)

36
scrapy/core/engine.py
View File

@ -21,7 +21,7 @@ from scrapy.utils.log import logformatter_adapter, failure_to_exc_info
logger = logging.getLogger(__name__)
class Slot(object):
class Slot:
def __init__(self, start_requests, close_if_idle, nextcall, scheduler):
self.closing = False
@ -53,7 +53,7 @@ class Slot(object):
self.closing.callback(None)
class ExecutionEngine(object):
class ExecutionEngine:
def __init__(self, crawler, spider_closed_callback):
self.crawler = crawler
@ -73,7 +73,8 @@ class ExecutionEngine(object):
@defer.inlineCallbacks
def start(self):
"""Start the execution engine"""
assert not self.running, "Engine already running"
if self.running:
raise RuntimeError("Engine already running")
self.start_time = time()
yield self.signals.send_catch_log_deferred(signal=signals.engine_started)
self.running = True
@ -82,7 +83,8 @@ class ExecutionEngine(object):
def stop(self):
"""Stop the execution engine gracefully"""
assert self.running, "Engine not running"
if not self.running:
raise RuntimeError("Engine not running")
self.running = False
dfd = self._close_all_spiders()
return dfd.addBoth(lambda _: self._finish_stopping_engine())
@ -165,7 +167,11 @@ class ExecutionEngine(object):
return d
def _handle_downloader_output(self, response, request, spider):
assert isinstance(response, (Request, Response, Failure)), response
if not isinstance(response, (Request, Response, Failure)):
raise TypeError(
"Incorrect type: expected Request, Response or Failure, got %s: %r"
% (type(response), response)
)
# downloader middleware can return requests (for example, redirects)
if isinstance(response, Request):
self.crawl(response, spider)
@ -205,8 +211,8 @@ class ExecutionEngine(object):
return not bool(self.slot)
def crawl(self, request, spider):
assert spider in self.open_spiders, \
"Spider %r not opened when crawling: %s" % (spider.name, request)
if spider not in self.open_spiders:
raise RuntimeError("Spider %r not opened when crawling: %s" % (spider.name, request))
self.schedule(request, spider)
self.slot.nextcall.schedule()
@ -230,8 +236,13 @@ class ExecutionEngine(object):
def _download(self, request, spider):
slot = self.slot
slot.add_request(request)
def _on_success(response):
assert isinstance(response, (Response, Request))
if not isinstance(response, (Response, Request)):
raise TypeError(
"Incorrect type: expected Response or Request, got %s: %r"
% (type(response), response)
)
if isinstance(response, Response):
response.request = request # tie request to response received
logkws = self.logformatter.crawled(request, response, spider)
@ -252,8 +263,8 @@ class ExecutionEngine(object):
@defer.inlineCallbacks
def open_spider(self, spider, start_requests=(), close_if_idle=True):
assert self.has_capacity(), "No free spider slot when opening %r" % \
spider.name
if not self.has_capacity():
raise RuntimeError("No free spider slot when opening %r" % spider.name)
logger.info("Spider opened", extra={'spider': spider})
nextcall = CallLaterOnce(self._next_request, spider)
scheduler = self.scheduler_cls.from_crawler(self.crawler)
@ -276,10 +287,9 @@ class ExecutionEngine(object):
next loop and this function is guaranteed to be called (at least) once
again for this spider.
"""
res = self.signals.send_catch_log(signal=signals.spider_idle, \
res = self.signals.send_catch_log(signal=signals.spider_idle,
spider=spider, dont_log=DontCloseSpider)
if any(isinstance(x, Failure) and isinstance(x.value, DontCloseSpider) \
for _, x in res):
if any(isinstance(x, Failure) and isinstance(x.value, DontCloseSpider) for _, x in res):
return
if self.spider_is_idle(spider):

35
scrapy/core/scheduler.py
View File

@ -14,7 +14,7 @@ from scrapy.utils.deprecate import ScrapyDeprecationWarning
logger = logging.getLogger(__name__)
class Scheduler(object):
class Scheduler:
"""
Scrapy Scheduler. It allows to enqueue requests and then get
a next request to download. Scheduler is also handling duplication
@ -66,8 +66,7 @@ class Scheduler(object):
dqclass = load_object(settings['SCHEDULER_DISK_QUEUE'])
mqclass = load_object(settings['SCHEDULER_MEMORY_QUEUE'])
logunser = settings.getbool('LOG_UNSERIALIZABLE_REQUESTS',
settings.getbool('SCHEDULER_DEBUG'))
logunser = settings.getbool('SCHEDULER_DEBUG')
return cls(dupefilter, jobdir=job_dir(settings), logunser=logunser,
stats=crawler.stats, pqclass=pqclass, dqclass=dqclass,
mqclass=mqclass, crawler=crawler)
@ -119,7 +118,7 @@ class Scheduler(object):
if self.dqs is None:
return
try:
self.dqs.push(request, -request.priority)
self.dqs.push(request)
except ValueError as e: # non serializable request
if self.logunser:
msg = ("Unable to serialize request: %(request)s - reason:"
@ -135,35 +134,29 @@ class Scheduler(object):
return True
def _mqpush(self, request):
self.mqs.push(request, -request.priority)
self.mqs.push(request)
def _dqpop(self):
if self.dqs:
return self.dqs.pop()
def _newmq(self, priority):
""" Factory for creating memory queues. """
return self.mqclass()
def _newdq(self, priority):
""" Factory for creating disk queues. """
path = join(self.dqdir, 'p%s' % (priority, ))
return self.dqclass(path)
def _mq(self):
""" Create a new priority queue instance, with in-memory storage """
return create_instance(self.pqclass, None, self.crawler, self._newmq,
serialize=False)
return create_instance(self.pqclass,
settings=None,
crawler=self.crawler,
downstream_queue_cls=self.mqclass,
key='')
def _dq(self):
""" Create a new priority queue instance, with disk storage """
state = self._read_dqs_state(self.dqdir)
q = create_instance(self.pqclass,
None,
self.crawler,
self._newdq,
state,
serialize=True)
settings=None,
crawler=self.crawler,
downstream_queue_cls=self.dqclass,
key=self.dqdir,
startprios=state)
if q:
logger.info("Resuming crawl (%(queuesize)d requests scheduled)",
{'queuesize': len(q)}, extra={'spider': self.spider})

59
scrapy/core/scraper.py
View File

@ -9,19 +9,19 @@ from twisted.internet import defer
from scrapy.utils.defer import defer_result, defer_succeed, parallel, iter_errback
from scrapy.utils.spider import iterate_spider_output
from scrapy.utils.misc import load_object
from scrapy.utils.misc import load_object, warn_on_generator_with_return_value
from scrapy.utils.log import logformatter_adapter, failure_to_exc_info
from scrapy.exceptions import CloseSpider, DropItem, IgnoreRequest
from scrapy import signals
from scrapy.http import Request, Response
from scrapy.item import BaseItem
from scrapy.core.spidermw import SpiderMiddlewareManager
from scrapy.utils.request import referer_str
logger = logging.getLogger(__name__)
class Slot(object):
class Slot:
"""Scraper slot (one per running spider)"""
MIN_RESPONSE_SIZE = 1024
@ -62,7 +62,7 @@ class Slot(object):
return self.active_size > self.max_active_size
class Scraper(object):
class Scraper:
def __init__(self, crawler):
self.slot = None
@ -77,7 +77,7 @@ class Scraper(object):
@defer.inlineCallbacks
def open_spider(self, spider):
"""Open the given spider for scraping and allocate resources for it"""
self.slot = Slot()
self.slot = Slot(self.crawler.settings.getint('SCRAPER_SLOT_MAX_ACTIVE_SIZE'))
yield self.itemproc.open_spider(spider)
def close_spider(self, spider):
@ -99,11 +99,13 @@ class Scraper(object):
def enqueue_scrape(self, response, request, spider):
slot = self.slot
dfd = slot.add_response_request(response, request)
def finish_scraping(_):
slot.finish_response(response, request)
self._check_if_closing(spider, slot)
self._scrape_next(spider, slot)
return _
dfd.addBoth(finish_scraping)
dfd.addErrback(
lambda f: logger.error('Scraper bug processing %(request)s',
@ -121,9 +123,13 @@ class Scraper(object):
def _scrape(self, response, request, spider):
"""Handle the downloaded response or failure through the spider
callback/errback"""
assert isinstance(response, (Response, Failure))
if not isinstance(response, (Response, Failure)):
raise TypeError(
"Incorrect type: expected Response or Failure, got %s: %r"
% (type(response), response)
)
dfd = self._scrape2(response, request, spider) # returns spiders processed output
dfd = self._scrape2(response, request, spider) # returns spider's processed output
dfd.addErrback(self.handle_spider_error, request, response, spider)
dfd.addCallback(self.handle_spider_output, request, response, spider)
return dfd
@ -142,7 +148,10 @@ class Scraper(object):
def call_spider(self, result, request, spider):
result.request = request
dfd = defer_result(result)
dfd.addCallbacks(callback=request.callback or spider.parse,
callback = request.callback or spider.parse
warn_on_generator_with_return_value(spider, callback)
warn_on_generator_with_return_value(spider, request.errback)
dfd.addCallbacks(callback=callback,
errback=request.errback,
callbackKeywords=request.cb_kwargs)
return dfd.addCallback(iterate_spider_output)
@ -152,9 +161,9 @@ class Scraper(object):
if isinstance(exc, CloseSpider):
self.crawler.engine.close_spider(spider, exc.reason or 'cancelled')
return
logger.error(
"Spider error processing %(request)s (referer: %(referer)s)",
{'request': request, 'referer': referer_str(request)},
logkws = self.logformatter.spider_error(_failure, request, response, spider)
logger.log(
*logformatter_adapter(logkws),
exc_info=failure_to_exc_info(_failure),
extra={'spider': spider}
)
@ -172,8 +181,8 @@ class Scraper(object):
if not result:
return defer_succeed(None)
it = iter_errback(result, self.handle_spider_error, request, response, spider)
dfd = parallel(it, self.concurrent_items,
self._process_spidermw_output, request, response, spider)
dfd = parallel(it, self.concurrent_items, self._process_spidermw_output,
request, response, spider)
return dfd
def _process_spidermw_output(self, output, request, response, spider):
@ -200,19 +209,23 @@ class Scraper(object):
"""Log and silence errors that come from the engine (typically download
errors that got propagated thru here)
"""
if (isinstance(download_failure, Failure) and
not download_failure.check(IgnoreRequest)):
if isinstance(download_failure, Failure) and not download_failure.check(IgnoreRequest):
if download_failure.frames:
logger.error('Error downloading %(request)s',
{'request': request},
exc_info=failure_to_exc_info(download_failure),
extra={'spider': spider})
logkws = self.logformatter.download_error(download_failure, request, spider)
logger.log(
*logformatter_adapter(logkws),
extra={'spider': spider},
exc_info=failure_to_exc_info(download_failure),
)
else:
errmsg = download_failure.getErrorMessage()
if errmsg:
logger.error('Error downloading %(request)s: %(errmsg)s',
{'request': request, 'errmsg': errmsg},
extra={'spider': spider})
logkws = self.logformatter.download_error(
download_failure, request, spider, errmsg)
logger.log(
*logformatter_adapter(logkws),
extra={'spider': spider},
)
if spider_failure is not download_failure:
return spider_failure
@ -231,7 +244,7 @@ class Scraper(object):
signal=signals.item_dropped, item=item, response=response,
spider=spider, exception=output.value)
else:
logkws = self.logformatter.error(item, ex, response, spider)
logkws = self.logformatter.item_error(item, ex, response, spider)
logger.log(*logformatter_adapter(logkws), extra={'spider': spider},
exc_info=failure_to_exc_info(output))
return self.signals.send_catch_log_deferred(

70
scrapy/core/spidermw.py
View File

@ -3,13 +3,14 @@ Spider Middleware manager
See documentation in docs/topics/spider-middleware.rst
"""
from itertools import chain, islice
from itertools import islice
from twisted.python.failure import Failure
from scrapy.exceptions import _InvalidOutput
from scrapy.middleware import MiddlewareManager
from scrapy.utils.defer import mustbe_deferred
from scrapy.utils.conf import build_component_list
from scrapy.utils.defer import mustbe_deferred
from scrapy.utils.python import MutableChain
@ -17,6 +18,13 @@ def _isiterable(possible_iterator):
return hasattr(possible_iterator, '__iter__')
def _fname(f):
return "%s.%s".format(
f.__self__.__class__.__name__,
f.__func__.__name__
)
class SpiderMiddlewareManager(MiddlewareManager):
component_name = 'spider middleware'
@ -31,27 +39,36 @@ class SpiderMiddlewareManager(MiddlewareManager):
self.methods['process_spider_input'].append(mw.process_spider_input)
if hasattr(mw, 'process_start_requests'):
self.methods['process_start_requests'].appendleft(mw.process_start_requests)
self.methods['process_spider_output'].appendleft(getattr(mw, 'process_spider_output', None))
self.methods['process_spider_exception'].appendleft(getattr(mw, 'process_spider_exception', None))
process_spider_output = getattr(mw, 'process_spider_output', None)
self.methods['process_spider_output'].appendleft(process_spider_output)
process_spider_exception = getattr(mw, 'process_spider_exception', None)
self.methods['process_spider_exception'].appendleft(process_spider_exception)
def scrape_response(self, scrape_func, response, request, spider):
fname = lambda f: '%s.%s' % (
f.__self__.__class__.__name__,
f.__func__.__name__)
def process_spider_input(response):
for method in self.methods['process_spider_input']:
try:
result = method(response=response, spider=spider)
if result is not None:
raise _InvalidOutput('Middleware {} must return None or raise an exception, got {}'
.format(fname(method), type(result)))
msg = "Middleware {} must return None or raise an exception, got {}"
raise _InvalidOutput(msg.format(_fname(method), type(result)))
except _InvalidOutput:
raise
except Exception:
return scrape_func(Failure(), request, spider)
return scrape_func(response, request, spider)
def _evaluate_iterable(iterable, exception_processor_index, recover_to):
try:
for r in iterable:
yield r
except Exception as ex:
exception_result = process_spider_exception(Failure(ex), exception_processor_index)
if isinstance(exception_result, Failure):
raise
recover_to.extend(exception_result)
def process_spider_exception(_failure, start_index=0):
exception = _failure.value
# don't handle _InvalidOutput exception
@ -65,12 +82,12 @@ class SpiderMiddlewareManager(MiddlewareManager):
if _isiterable(result):
# stop exception handling by handing control over to the
# process_spider_output chain if an iterable has been returned
return process_spider_output(result, method_index+1)
return process_spider_output(result, method_index + 1)
elif result is None:
continue
else:
raise _InvalidOutput('Middleware {} must return None or an iterable, got {}'
.format(fname(method), type(result)))
msg = "Middleware {} must return None or an iterable, got {}"
raise _InvalidOutput(msg.format(_fname(method), type(result)))
return _failure
def process_spider_output(result, start_index=0):
@ -78,38 +95,33 @@ class SpiderMiddlewareManager(MiddlewareManager):
# chain, they went through it already from the process_spider_exception method
recovered = MutableChain()
def evaluate_iterable(iterable, index):
try:
for r in iterable:
yield r
except Exception as ex:
exception_result = process_spider_exception(Failure(ex), index+1)
if isinstance(exception_result, Failure):
raise
recovered.extend(exception_result)
method_list = islice(self.methods['process_spider_output'], start_index, None)
for method_index, method in enumerate(method_list, start=start_index):
if method is None:
continue
# the following might fail directly if the output value is not a generator
try:
# might fail directly if the output value is not a generator
result = method(response=response, result=result, spider=spider)
except Exception as ex:
exception_result = process_spider_exception(Failure(ex), method_index+1)
exception_result = process_spider_exception(Failure(ex), method_index + 1)
if isinstance(exception_result, Failure):
raise
return exception_result
if _isiterable(result):
result = evaluate_iterable(result, method_index)
result = _evaluate_iterable(result, method_index + 1, recovered)
else:
raise _InvalidOutput('Middleware {} must return an iterable, got {}'
.format(fname(method), type(result)))
msg = "Middleware {} must return an iterable, got {}"
raise _InvalidOutput(msg.format(_fname(method), type(result)))
return chain(result, recovered)
return MutableChain(result, recovered)
def process_callback_output(result):
recovered = MutableChain()
result = _evaluate_iterable(result, 0, recovered)
return MutableChain(process_spider_output(result), recovered)
dfd = mustbe_deferred(process_spider_input, response)
dfd.addCallbacks(callback=process_spider_output, errback=process_spider_exception)
dfd.addCallbacks(callback=process_callback_output, errback=process_spider_exception)
return dfd
def process_start_requests(self, start_requests, spider):

116
scrapy/crawler.py
View File

@ -3,34 +3,44 @@ import pprint
import signal
import warnings
from twisted.internet import reactor, defer
from zope.interface.verify import verifyClass, DoesNotImplement
from twisted.internet import defer
from zope.interface.exceptions import DoesNotImplement
from scrapy import Spider
try:
# zope >= 5.0 only supports MultipleInvalid
from zope.interface.exceptions import MultipleInvalid
except ImportError:
MultipleInvalid = None
from zope.interface.verify import verifyClass
from scrapy import signals, Spider
from scrapy.core.engine import ExecutionEngine
from scrapy.resolver import CachingThreadedResolver
from scrapy.interfaces import ISpiderLoader
from scrapy.exceptions import ScrapyDeprecationWarning
from scrapy.extension import ExtensionManager
from scrapy.interfaces import ISpiderLoader
from scrapy.settings import overridden_settings, Settings
from scrapy.signalmanager import SignalManager
from scrapy.exceptions import ScrapyDeprecationWarning
from scrapy.utils.ossignal import install_shutdown_handlers, signal_names
from scrapy.utils.misc import load_object
from scrapy.utils.log import (
LogCounterHandler, configure_logging, log_scrapy_info,
get_scrapy_root_handler, install_scrapy_root_handler)
from scrapy import signals
configure_logging,
get_scrapy_root_handler,
install_scrapy_root_handler,
log_scrapy_info,
LogCounterHandler,
)
from scrapy.utils.misc import create_instance, load_object
from scrapy.utils.ossignal import install_shutdown_handlers, signal_names
from scrapy.utils.reactor import install_reactor, verify_installed_reactor
logger = logging.getLogger(__name__)
class Crawler(object):
class Crawler:
def __init__(self, spidercls, settings=None):
if isinstance(spidercls, Spider):
raise ValueError(
'The spidercls argument must be a class, not an object')
raise ValueError('The spidercls argument must be a class, not an object')
if isinstance(settings, dict) or settings is None:
settings = Settings(settings)
@ -66,20 +76,10 @@ class Crawler(object):
self.spider = None
self.engine = None
@property
def spiders(self):
if not hasattr(self, '_spiders'):
warnings.warn("Crawler.spiders is deprecated, use "
"CrawlerRunner.spider_loader or instantiate "
"scrapy.spiderloader.SpiderLoader with your "
"settings.",
category=ScrapyDeprecationWarning, stacklevel=2)
self._spiders = _get_spider_loader(self.settings.frozencopy())
return self._spiders
@defer.inlineCallbacks
def crawl(self, *args, **kwargs):
assert not self.crawling, "Crawling already taking place"
if self.crawling:
raise RuntimeError("Crawling already taking place")
self.crawling = True
try:
@ -109,7 +109,7 @@ class Crawler(object):
yield defer.maybeDeferred(self.engine.stop)
class CrawlerRunner(object):
class CrawlerRunner:
"""
This is a convenient helper class that keeps track of, manages and runs
crawlers inside an already setup :mod:`~twisted.internet.reactor`.
@ -128,14 +128,32 @@ class CrawlerRunner(object):
":meth:`crawl` and managed by this class."
)
@staticmethod
def _get_spider_loader(settings):
""" Get SpiderLoader instance from settings """
cls_path = settings.get('SPIDER_LOADER_CLASS')
loader_cls = load_object(cls_path)
excs = (DoesNotImplement, MultipleInvalid) if MultipleInvalid else DoesNotImplement
try:
verifyClass(ISpiderLoader, loader_cls)
except excs:
warnings.warn(
'SPIDER_LOADER_CLASS (previously named SPIDER_MANAGER_CLASS) does '
'not fully implement scrapy.interfaces.ISpiderLoader interface. '
'Please add all missing methods to avoid unexpected runtime errors.',
category=ScrapyDeprecationWarning, stacklevel=2
)
return loader_cls.from_settings(settings.frozencopy())
def __init__(self, settings=None):
if isinstance(settings, dict) or settings is None:
settings = Settings(settings)
self.settings = settings
self.spider_loader = _get_spider_loader(settings)
self.spider_loader = self._get_spider_loader(settings)
self._crawlers = set()
self._active = set()
self.bootstrap_failed = False
self._handle_twisted_reactor()
@property
def spiders(self):
@ -229,6 +247,10 @@ class CrawlerRunner(object):
while self._active:
yield defer.DeferredList(self._active)
def _handle_twisted_reactor(self):
if self.settings.get("TWISTED_REACTOR"):
verify_installed_reactor(self.settings["TWISTED_REACTOR"])
class CrawlerProcess(CrawlerRunner):
"""
@ -261,6 +283,7 @@ class CrawlerProcess(CrawlerRunner):
log_scrapy_info(self.settings)
def _signal_shutdown(self, signum, _):
from twisted.internet import reactor
install_shutdown_handlers(self._signal_kill)
signame = signal_names[signum]
logger.info("Received %(signame)s, shutting down gracefully. Send again to force ",
@ -268,6 +291,7 @@ class CrawlerProcess(CrawlerRunner):
reactor.callFromThread(self._graceful_stop_reactor)
def _signal_kill(self, signum, _):
from twisted.internet import reactor
install_shutdown_handlers(signal.SIG_IGN)
signame = signal_names[signum]
logger.info('Received %(signame)s twice, forcing unclean shutdown',
@ -286,6 +310,7 @@ class CrawlerProcess(CrawlerRunner):
:param boolean stop_after_crawl: stop or not the reactor when all
crawlers have finished
"""
from twisted.internet import reactor
if stop_after_crawl:
d = self.join()
# Don't start the reactor if the deferreds are already fired
@ -293,46 +318,27 @@ class CrawlerProcess(CrawlerRunner):
return
d.addBoth(self._stop_reactor)
reactor.installResolver(self._get_dns_resolver())
resolver_class = load_object(self.settings["DNS_RESOLVER"])
resolver = create_instance(resolver_class, self.settings, self, reactor=reactor)
resolver.install_on_reactor()
tp = reactor.getThreadPool()
tp.adjustPoolsize(maxthreads=self.settings.getint('REACTOR_THREADPOOL_MAXSIZE'))
reactor.addSystemEventTrigger('before', 'shutdown', self.stop)
reactor.run(installSignalHandlers=False) # blocking call
def _get_dns_resolver(self):
if self.settings.getbool('DNSCACHE_ENABLED'):
cache_size = self.settings.getint('DNSCACHE_SIZE')
else:
cache_size = 0
return CachingThreadedResolver(
reactor=reactor,
cache_size=cache_size,
timeout=self.settings.getfloat('DNS_TIMEOUT')
)
def _graceful_stop_reactor(self):
d = self.stop()
d.addBoth(self._stop_reactor)
return d
def _stop_reactor(self, _=None):
from twisted.internet import reactor
try:
reactor.stop()
except RuntimeError: # raised if already stopped or in shutdown stage
pass
def _get_spider_loader(settings):
""" Get SpiderLoader instance from settings """
cls_path = settings.get('SPIDER_LOADER_CLASS')
loader_cls = load_object(cls_path)
try:
verifyClass(ISpiderLoader, loader_cls)
except DoesNotImplement:
warnings.warn(
'SPIDER_LOADER_CLASS (previously named SPIDER_MANAGER_CLASS) does '
'not fully implement scrapy.interfaces.ISpiderLoader interface. '
'Please add all missing methods to avoid unexpected runtime errors.',
category=ScrapyDeprecationWarning, stacklevel=2
)
return loader_cls.from_settings(settings.frozencopy())
def _handle_twisted_reactor(self):
if self.settings.get("TWISTED_REACTOR"):
install_reactor(self.settings["TWISTED_REACTOR"])
super()._handle_twisted_reactor()

4
scrapy/downloadermiddlewares/ajaxcrawl.py
View File

@ -11,7 +11,7 @@ from scrapy.http import HtmlResponse
logger = logging.getLogger(__name__)
class AjaxCrawlMiddleware(object):
class AjaxCrawlMiddleware:
"""
Handle 'AJAX crawlable' pages marked as crawlable via meta tag.
For more info see https://developers.google.com/webmasters/ajax-crawling/docs/getting-started.
@ -47,7 +47,7 @@ class AjaxCrawlMiddleware(object):
return response
# scrapy already handles #! links properly
ajax_crawl_request = request.replace(url=request.url+'#!')
ajax_crawl_request = request.replace(url=request.url + '#!')
logger.debug("Downloading AJAX crawlable %(ajax_crawl_request)s instead of %(request)s",
{'ajax_crawl_request': ajax_crawl_request, 'request': request},
extra={'spider': spider})

21
scrapy/downloadermiddlewares/chunked.py
View File

@ -1,21 +0,0 @@
import warnings
from scrapy.exceptions import ScrapyDeprecationWarning
from scrapy.utils.http import decode_chunked_transfer
warnings.warn("Module `scrapy.downloadermiddlewares.chunked` is deprecated, "
"chunked transfers are supported by default.",
ScrapyDeprecationWarning, stacklevel=2)
class ChunkedTransferMiddleware(object):
"""This middleware adds support for chunked transfer encoding, as
documented in: https://en.wikipedia.org/wiki/Chunked_transfer_encoding
"""
def process_response(self, request, response, spider):
if response.headers.get('Transfer-Encoding') == 'chunked':
body = decode_chunked_transfer(response.body)
return response.replace(body=body)
return response

2
scrapy/downloadermiddlewares/cookies.py
View File

@ -10,7 +10,7 @@ from scrapy.utils.python import to_unicode
logger = logging.getLogger(__name__)
class CookiesMiddleware(object):
class CookiesMiddleware:
"""This middleware enables working with sites that need cookies"""
def __init__(self, debug=False):

2
scrapy/downloadermiddlewares/decompression.py
View File

@ -16,7 +16,7 @@ from scrapy.responsetypes import responsetypes
logger = logging.getLogger(__name__)
class DecompressionMiddleware(object):
class DecompressionMiddleware:
""" This middleware tries to recognise and extract the possibly compressed
responses that may arrive. """

2
scrapy/downloadermiddlewares/defaultheaders.py
View File

@ -7,7 +7,7 @@ See documentation in docs/topics/downloader-middleware.rst
from scrapy.utils.python import without_none_values
class DefaultHeadersMiddleware(object):
class DefaultHeadersMiddleware:
def __init__(self, headers):
self._headers = headers

2
scrapy/downloadermiddlewares/downloadtimeout.py
View File

@ -7,7 +7,7 @@ See documentation in docs/topics/downloader-middleware.rst
from scrapy import signals
class DownloadTimeoutMiddleware(object):
class DownloadTimeoutMiddleware:
def __init__(self, timeout=180):
self._timeout = timeout

2
scrapy/downloadermiddlewares/httpauth.py
View File

@ -9,7 +9,7 @@ from w3lib.http import basic_auth_header
from scrapy import signals
class HttpAuthMiddleware(object):
class HttpAuthMiddleware:
"""Set Basic HTTP Authorization header
(http_user and http_pass spider class attributes)"""

2
scrapy/downloadermiddlewares/httpcache.py
View File

@ -17,7 +17,7 @@ from scrapy.exceptions import IgnoreRequest, NotConfigured
from scrapy.utils.misc import load_object
class HttpCacheMiddleware(object):
class HttpCacheMiddleware:
DOWNLOAD_EXCEPTIONS = (defer.TimeoutError, TimeoutError, DNSLookupError,
ConnectionRefusedError, ConnectionDone, ConnectError,

4
scrapy/downloadermiddlewares/httpcompression.py
View File

@ -15,7 +15,7 @@ except ImportError:
pass
class HttpCompressionMiddleware(object):
class HttpCompressionMiddleware:
"""This middleware allows compressed (gzip, deflate) traffic to be
sent/received from web sites"""
@classmethod
@ -26,7 +26,7 @@ class HttpCompressionMiddleware(object):
def process_request(self, request, spider):
request.headers.setdefault('Accept-Encoding',
b",".join(ACCEPTED_ENCODINGS))
b", ".join(ACCEPTED_ENCODINGS))
def process_response(self, request, response, spider):

2
scrapy/downloadermiddlewares/httpproxy.py
View File

@ -7,7 +7,7 @@ from scrapy.utils.httpobj import urlparse_cached
from scrapy.utils.python import to_bytes
class HttpProxyMiddleware(object):
class HttpProxyMiddleware:
def __init__(self, auth_encoding='latin-1'):
self.auth_encoding = auth_encoding

16
scrapy/downloadermiddlewares/redirect.py
View File

@ -11,7 +11,7 @@ from scrapy.exceptions import IgnoreRequest, NotConfigured
logger = logging.getLogger(__name__)
class BaseRedirectMiddleware(object):
class BaseRedirectMiddleware:
enabled_setting = 'REDIRECT_ENABLED'
@ -60,11 +60,14 @@ class RedirectMiddleware(BaseRedirectMiddleware):
Handle redirection of requests based on response status
and meta-refresh html tag.
"""
def process_response(self, request, response, spider):
if (request.meta.get('dont_redirect', False) or
response.status in getattr(spider, 'handle_httpstatus_list', []) or
response.status in request.meta.get('handle_httpstatus_list', []) or
request.meta.get('handle_httpstatus_all', False)):
if (
request.meta.get('dont_redirect', False)
or response.status in getattr(spider, 'handle_httpstatus_list', [])
or response.status in request.meta.get('handle_httpstatus_list', [])
or request.meta.get('handle_httpstatus_all', False)
):
return response
allowed_status = (301, 302, 303, 307, 308)
@ -93,8 +96,7 @@ class MetaRefreshMiddleware(BaseRedirectMiddleware):
def __init__(self, settings):
super(MetaRefreshMiddleware, self).__init__(settings)
self._ignore_tags = settings.getlist('METAREFRESH_IGNORE_TAGS')
self._maxdelay = settings.getint('REDIRECT_MAX_METAREFRESH_DELAY',
settings.getint('METAREFRESH_MAXDELAY'))
self._maxdelay = settings.getint('METAREFRESH_MAXDELAY')
def process_response(self, request, response, spider):
if request.meta.get('dont_redirect', False) or request.method == 'HEAD' or \

4
scrapy/downloadermiddlewares/retry.py
View File

@ -25,7 +25,7 @@ from scrapy.utils.python import global_object_name
logger = logging.getLogger(__name__)
class RetryMiddleware(object):
class RetryMiddleware:
# IOError is raised by the HttpCompression middleware when trying to
# decompress an empty response
@ -84,6 +84,6 @@ class RetryMiddleware(object):
return retryreq
else:
stats.inc_value('retry/max_reached')
logger.debug("Gave up retrying %(request)s (failed %(retries)d times): %(reason)s",
logger.error("Gave up retrying %(request)s (failed %(retries)d times): %(reason)s",
{'request': request, 'retries': retries, 'reason': reason},
extra={'spider': spider})

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