Upgrade PyPy for CI, and test both 3.5 (oldest) and 3.6 (newest) (#4504)

* Upgrade PyPy for CI, and test both 3.5 (oldest) and 3.6 (newest)

* Log a detailed error message to discover why MockServer is not working

* Go for all lines!

* Disable tests based on mitmproxy while running on PyPy

* Fix test_get_func_args for PyPy 3.6+

* Make testPayloadDefaultCiphers work regardless of OpenSSL default ciphers

* Crossing fingers…

* Rename: testPayloadDefaultCiphers → testPayloadDisabledCipher

* Test the PyPy version currently documented as the minimum required version

* Fix the PYPY_VERSION tag

* Update the documentation about supported PyPy versions

* Also test the latest 3.5 Python version with PyPy

* Fix the PYPY_VERSION value for the latest 3.5 version

* Use pinned dependencies for asyncio and PyPy tests against oldest supported Python versions

* Fix PyPy installation for the pypy3-pinned Tox environment

* Try installing Cython

* Maybe PyPy requires lxml 3.6.0?

* install.rst: minor clarification

* lxml 4.0.0 is required on PyPy

* Require setuptools 18.5+

* Revert "Require setuptools 18.5+"

This reverts commit 017ec33ac2.

* Maintain lxml as a dependency if setuptools < 18.5 is used

.travis.yml

@@ -18,19 +18,25 @@ matrix:
     - env: TOXENV=typing
       python: 3.8
 
-    - env: TOXENV=pypy3
     - env: TOXENV=pinned
       python: 3.5.2
-    - env: TOXENV=asyncio
+    - env: TOXENV=asyncio-pinned
       python: 3.5.2  # We use additional code to support 3.5.3 and earlier
+    - env: TOXENV=pypy3-pinned PYPY_VERSION=3-v5.9.0
+
     - env: TOXENV=py
       python: 3.5
     - env: TOXENV=asyncio
       python: 3.5  # We use specific code to support >= 3.5.4, < 3.6
+    - env: TOXENV=pypy3 PYPY_VERSION=3.5-v7.0.0
+
     - env: TOXENV=py
       python: 3.6
+    - env: TOXENV=pypy3 PYPY_VERSION=3.6-v7.3.1
+
     - env: TOXENV=py
       python: 3.7
+
     - env: TOXENV=py PYPI_RELEASE_JOB=true
       python: 3.8
       dist: bionic
@@ -42,9 +48,9 @@ matrix:
       dist: bionic
 install:
   - |
-      if [ "$TOXENV" = "pypy3" ]; then
-        export PYPY_VERSION="pypy3.5-5.9-beta-linux_x86_64-portable"
-        wget "https://bitbucket.org/squeaky/portable-pypy/downloads/${PYPY_VERSION}.tar.bz2"
+      if [[ ! -z "$PYPY_VERSION" ]]; then
+        export PYPY_VERSION="pypy$PYPY_VERSION-linux64"
+        wget "https://bitbucket.org/pypy/pypy/downloads/${PYPY_VERSION}.tar.bz2"
         tar -jxf ${PYPY_VERSION}.tar.bz2
         virtualenv --python="$PYPY_VERSION/bin/pypy3" "$HOME/virtualenvs/$PYPY_VERSION"
         source "$HOME/virtualenvs/$PYPY_VERSION/bin/activate"

docs/faq.rst

@@ -64,20 +64,6 @@ Here's an example spider using BeautifulSoup API, with ``lxml`` as the HTML pars
 
 .. _BeautifulSoup's official documentation: https://www.crummy.com/software/BeautifulSoup/bs4/doc/#specifying-the-parser-to-use
 
-.. _faq-python-versions:
-
-What Python versions does Scrapy support?
------------------------------------------
-
-Scrapy is supported under Python 3.5.2+
-under CPython (default Python implementation) and PyPy (starting with PyPy 5.9).
-Python 3 support was added in Scrapy 1.1.
-PyPy support was added in Scrapy 1.4, PyPy3 support was added in Scrapy 1.5.
-Python 2 support was dropped in Scrapy 2.0.
-
-.. note::
-    For Python 3 support on Windows, it is recommended to use
-    Anaconda/Miniconda as :ref:`outlined in the installation guide <intro-install-windows>`.
 
 Did Scrapy "steal" X from Django?
 ---------------------------------

docs/intro/install.rst

@@ -4,12 +4,18 @@
 Installation guide
 ==================
 
+.. _faq-python-versions:
+
+Supported Python versions
+=========================
+
+Scrapy requires Python 3.5.2+, either the CPython implementation (default) or
+the PyPy 5.9+ implementation (see :ref:`python:implementations`).
+
+
 Installing Scrapy
 =================
 
-Scrapy runs on Python 3.5.2 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 macOS.

setup.py

@@ -18,12 +18,39 @@ def has_environment_marker_platform_impl_support():
     return parse_version(setuptools_version) >= parse_version('18.5')
 
 
+install_requires = [
+    'Twisted>=17.9.0',
+    'cryptography>=2.0',
+    'cssselect>=0.9.1',
+    'itemloaders>=1.0.1',
+    'lxml>=3.5.0',
+    'parsel>=1.5.0',
+    'PyDispatcher>=2.0.5',
+    'pyOpenSSL>=16.2.0',
+    'queuelib>=1.4.2',
+    'service_identity>=16.0.0',
+    'w3lib>=1.17.0',
+    'zope.interface>=4.1.3',
+    'protego>=0.1.15',
+    'itemadapter>=0.1.0',
+]
 extras_require = {}
 
 if has_environment_marker_platform_impl_support():
+    extras_require[':platform_python_implementation == "CPython"'] = [
+        'lxml>=3.5.0',
+    ]
     extras_require[':platform_python_implementation == "PyPy"'] = [
+        # Earlier lxml versions are affected by
+        # https://bitbucket.org/pypy/pypy/issues/2498/cython-on-pypy-3-dict-object-has-no,
+        # which was fixed in Cython 0.26, released on 2017-06-19, and used to
+        # generate the C headers of lxml release tarballs published since then, the
+        # first of which was:
+        'lxml>=4.0.0',
         'PyPyDispatcher>=2.1.0',
     ]
+else:
+    install_requires.append('lxml>=3.5.0')
 
 
 setup(
@@ -67,21 +94,6 @@ setup(
         'Topic :: Software Development :: Libraries :: Python Modules',
     ],
     python_requires='>=3.5.2',
-    install_requires=[
-        'Twisted>=17.9.0',
-        'cryptography>=2.0',
-        'cssselect>=0.9.1',
-        'itemloaders>=1.0.1',
-        'lxml>=3.5.0',
-        'parsel>=1.5.0',
-        'PyDispatcher>=2.0.5',
-        'pyOpenSSL>=16.2.0',
-        'queuelib>=1.4.2',
-        'service_identity>=16.0.0',
-        'w3lib>=1.17.0',
-        'zope.interface>=4.1.3',
-        'protego>=0.1.15',
-        'itemadapter>=0.1.0',
-    ],
+    install_requires=install_requires,
     extras_require=extras_require,
 )

tests/test_proxy_connect.py

@@ -60,6 +60,8 @@ def _wrong_credentials(proxy_url):
 
 @skipIf(sys.version_info < (3, 5, 4),
         "requires mitmproxy < 3.0.0, which these tests do not support")
+@skipIf("pypy" in sys.executable,
+        "mitmproxy does not support PyPy")
 @skipIf(platform.system() == 'Windows' and sys.version_info < (3, 7),
         "mitmproxy does not support Windows when running Python < 3.7")
 class ProxyConnectTestCase(TestCase):

tests/test_utils_python.py

@@ -4,6 +4,7 @@ import operator
 import platform
 import unittest
 from itertools import count
+from sys import version_info
 from warnings import catch_warnings
 
 from scrapy.utils.python import (
@@ -214,9 +215,12 @@ class UtilsPythonTestCase(unittest.TestCase):
         else:
             self.assertEqual(
                 get_func_args(str.split, stripself=True), ['sep', 'maxsplit'])
-            self.assertEqual(get_func_args(" ".join, stripself=True), ['list'])
             self.assertEqual(
                 get_func_args(operator.itemgetter(2), stripself=True), ['obj'])
+            if version_info < (3, 6):
+                self.assertEqual(get_func_args(" ".join, stripself=True), ['list'])
+            else:
+                self.assertEqual(get_func_args(" ".join, stripself=True), ['iterable'])
 
     def test_without_none_values(self):
         self.assertEqual(without_none_values([1, None, 3, 4]), [1, 3, 4])

tests/test_webclient.py

@@ -413,7 +413,9 @@ class WebClientCustomCiphersSSLTestCase(WebClientSSLTestCase):
             self.getURL("payload"), body=s, contextFactory=client_context_factory
         ).addCallback(self.assertEqual, to_bytes(s))
 
-    def testPayloadDefaultCiphers(self):
+    def testPayloadDisabledCipher(self):
         s = "0123456789" * 10
-        d = getPage(self.getURL("payload"), body=s, contextFactory=ScrapyClientContextFactory())
+        settings = Settings({'DOWNLOADER_CLIENT_TLS_CIPHERS': 'ECDHE-RSA-AES256-GCM-SHA384'})
+        client_context_factory = create_instance(ScrapyClientContextFactory, settings=settings, crawler=None)
+        d = getPage(self.getURL("payload"), body=s, contextFactory=client_context_factory)
         return self.assertFailure(d, OpenSSL.SSL.Error)

tox.ini

@@ -58,11 +58,6 @@ deps =
 commands =
     pylint conftest.py docs extras scrapy setup.py tests
 
-[testenv:pypy3]
-basepython = pypy3
-commands =
-    py.test {posargs:--durations=10 docs scrapy tests}
-
 [pinned]
 deps =
     -ctests/constraints.txt
@@ -85,7 +80,6 @@ deps =
     Pillow==3.4.2
 
 [testenv:pinned]
-basepython = python3
 deps =
     {[pinned]deps}
     lxml==3.5.0
@@ -104,6 +98,27 @@ deps =
     reppy
     robotexclusionrulesparser
 
+[testenv:asyncio]
+commands =
+    {[testenv]commands} --reactor=asyncio
+
+[testenv:asyncio-pinned]
+commands = {[testenv:asyncio]commands}
+deps = {[testenv:pinned]deps}
+
+[testenv:pypy3]
+basepython = pypy3
+commands =
+    py.test {posargs:--durations=10 docs scrapy tests}
+
+[testenv:pypy3-pinned]
+basepython = {[testenv:pypy3]basepython}
+commands = {[testenv:pypy3]commands}
+deps =
+    {[pinned]deps}
+    lxml==4.0.0
+    PyPyDispatcher==2.1.0
+
 [docs]
 changedir = docs
 deps =
@@ -135,7 +150,3 @@ deps = {[docs]deps}
 setenv = {[docs]setenv}
 commands =
     sphinx-build -W -b linkcheck . {envtmpdir}/linkcheck
-
-[testenv:asyncio]
-commands =
-    {[testenv]commands} --reactor=asyncio