mirror of https://github.com/scrapy/scrapy.git
587 lines
21 KiB
Python
587 lines
21 KiB
Python
from __future__ import annotations
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from collections.abc import AsyncIterator, Iterable
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from inspect import isasyncgen
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from typing import Any
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from unittest import mock
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import pytest
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from testfixtures import LogCapture
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from twisted.internet import defer
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from twisted.trial.unittest import TestCase
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from scrapy.core.spidermw import SpiderMiddlewareManager
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from scrapy.exceptions import _InvalidOutput
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from scrapy.http import Request, Response
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from scrapy.spiders import Spider
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from scrapy.utils.asyncgen import collect_asyncgen
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from scrapy.utils.defer import deferred_f_from_coro_f, maybe_deferred_to_future
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from scrapy.utils.test import get_crawler
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class TestSpiderMiddleware(TestCase):
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def setUp(self):
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self.request = Request("http://example.com/index.html")
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self.response = Response(self.request.url, request=self.request)
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self.crawler = get_crawler(Spider, {"SPIDER_MIDDLEWARES_BASE": {}})
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self.spider = self.crawler._create_spider("foo")
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self.mwman = SpiderMiddlewareManager.from_crawler(self.crawler)
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async def _scrape_response(self) -> Any:
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"""Execute spider mw manager's scrape_response method and return the result.
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Raise exception in case of failure.
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"""
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scrape_func = mock.MagicMock()
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return await maybe_deferred_to_future(
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self.mwman.scrape_response(
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scrape_func, self.response, self.request, self.spider
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)
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)
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class TestProcessSpiderInputInvalidOutput(TestSpiderMiddleware):
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"""Invalid return value for process_spider_input method"""
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@deferred_f_from_coro_f
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async def test_invalid_process_spider_input(self):
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class InvalidProcessSpiderInputMiddleware:
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def process_spider_input(self, response, spider):
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return 1
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self.mwman._add_middleware(InvalidProcessSpiderInputMiddleware())
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with pytest.raises(_InvalidOutput):
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await self._scrape_response()
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class TestProcessSpiderOutputInvalidOutput(TestSpiderMiddleware):
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"""Invalid return value for process_spider_output method"""
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@deferred_f_from_coro_f
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async def test_invalid_process_spider_output(self):
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class InvalidProcessSpiderOutputMiddleware:
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def process_spider_output(self, response, result, spider):
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return 1
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self.mwman._add_middleware(InvalidProcessSpiderOutputMiddleware())
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with pytest.raises(_InvalidOutput):
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await self._scrape_response()
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class TestProcessSpiderExceptionInvalidOutput(TestSpiderMiddleware):
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"""Invalid return value for process_spider_exception method"""
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@deferred_f_from_coro_f
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async def test_invalid_process_spider_exception(self):
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class InvalidProcessSpiderOutputExceptionMiddleware:
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def process_spider_exception(self, response, exception, spider):
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return 1
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class RaiseExceptionProcessSpiderOutputMiddleware:
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def process_spider_output(self, response, result, spider):
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raise RuntimeError
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self.mwman._add_middleware(InvalidProcessSpiderOutputExceptionMiddleware())
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self.mwman._add_middleware(RaiseExceptionProcessSpiderOutputMiddleware())
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with pytest.raises(_InvalidOutput):
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await self._scrape_response()
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class TestProcessSpiderExceptionReRaise(TestSpiderMiddleware):
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"""Re raise the exception by returning None"""
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@deferred_f_from_coro_f
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async def test_process_spider_exception_return_none(self):
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class ProcessSpiderExceptionReturnNoneMiddleware:
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def process_spider_exception(self, response, exception, spider):
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return None
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class RaiseExceptionProcessSpiderOutputMiddleware:
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def process_spider_output(self, response, result, spider):
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1 / 0
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self.mwman._add_middleware(ProcessSpiderExceptionReturnNoneMiddleware())
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self.mwman._add_middleware(RaiseExceptionProcessSpiderOutputMiddleware())
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with pytest.raises(ZeroDivisionError):
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await self._scrape_response()
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class TestBaseAsyncSpiderMiddleware(TestSpiderMiddleware):
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"""Helpers for testing sync, async and mixed middlewares.
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Should work for process_spider_output and, when it's supported, process_start.
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"""
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ITEM_TYPE: type | tuple
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RESULT_COUNT = 3 # to simplify checks, let everything return 3 objects
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@staticmethod
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def _construct_mw_setting(
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*mw_classes: type[Any], start_index: int | None = None
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) -> dict[type[Any], int]:
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if start_index is None:
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start_index = 10
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return {i: c for c, i in enumerate(mw_classes, start=start_index)}
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def _scrape_func(self, *args, **kwargs):
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yield {"foo": 1}
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yield {"foo": 2}
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yield {"foo": 3}
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async def _get_middleware_result(
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self, *mw_classes: type[Any], start_index: int | None = None
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) -> Any:
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setting = self._construct_mw_setting(*mw_classes, start_index=start_index)
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self.crawler = get_crawler(
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Spider, {"SPIDER_MIDDLEWARES_BASE": {}, "SPIDER_MIDDLEWARES": setting}
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)
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self.spider = self.crawler._create_spider("foo")
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self.mwman = SpiderMiddlewareManager.from_crawler(self.crawler)
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return await self.mwman.scrape_response_async(
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self._scrape_func, self.response, self.request, self.spider
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)
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async def _test_simple_base(
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self,
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*mw_classes: type[Any],
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downgrade: bool = False,
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start_index: int | None = None,
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) -> None:
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with LogCapture() as log:
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result = await self._get_middleware_result(
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*mw_classes, start_index=start_index
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)
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assert isinstance(result, Iterable)
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result_list = list(result)
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assert len(result_list) == self.RESULT_COUNT
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assert isinstance(result_list[0], self.ITEM_TYPE)
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assert ("downgraded to a non-async" in str(log)) == downgrade
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assert ("doesn't support asynchronous spider output" in str(log)) == (
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ProcessSpiderOutputSimpleMiddleware in mw_classes
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)
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async def _test_asyncgen_base(
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self,
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*mw_classes: type[Any],
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downgrade: bool = False,
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start_index: int | None = None,
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) -> None:
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with LogCapture() as log:
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result = await self._get_middleware_result(
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*mw_classes, start_index=start_index
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)
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assert isinstance(result, AsyncIterator)
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result_list = await collect_asyncgen(result)
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assert len(result_list) == self.RESULT_COUNT
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assert isinstance(result_list[0], self.ITEM_TYPE)
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assert ("downgraded to a non-async" in str(log)) == downgrade
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class ProcessSpiderOutputSimpleMiddleware:
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def process_spider_output(self, response, result, spider):
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yield from result
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class ProcessSpiderOutputAsyncGenMiddleware:
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async def process_spider_output(self, response, result, spider):
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async for r in result:
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yield r
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class ProcessSpiderOutputUniversalMiddleware:
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def process_spider_output(self, response, result, spider):
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yield from result
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async def process_spider_output_async(self, response, result, spider):
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async for r in result:
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yield r
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class ProcessSpiderExceptionSimpleIterableMiddleware:
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def process_spider_exception(self, response, exception, spider):
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yield {"foo": 1}
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yield {"foo": 2}
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yield {"foo": 3}
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class ProcessSpiderExceptionAsyncIteratorMiddleware:
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async def process_spider_exception(self, response, exception, spider):
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yield {"foo": 1}
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d = defer.Deferred()
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from twisted.internet import reactor
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reactor.callLater(0, d.callback, None)
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await maybe_deferred_to_future(d)
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yield {"foo": 2}
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yield {"foo": 3}
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class TestProcessSpiderOutputSimple(TestBaseAsyncSpiderMiddleware):
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"""process_spider_output tests for simple callbacks"""
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ITEM_TYPE = dict
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MW_SIMPLE = ProcessSpiderOutputSimpleMiddleware
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MW_ASYNCGEN = ProcessSpiderOutputAsyncGenMiddleware
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MW_UNIVERSAL = ProcessSpiderOutputUniversalMiddleware
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@deferred_f_from_coro_f
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async def test_simple(self):
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"""Simple mw"""
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await self._test_simple_base(self.MW_SIMPLE)
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@deferred_f_from_coro_f
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async def test_asyncgen(self):
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"""Asyncgen mw; upgrade"""
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await self._test_asyncgen_base(self.MW_ASYNCGEN)
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@deferred_f_from_coro_f
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async def test_simple_asyncgen(self):
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"""Simple mw -> asyncgen mw; upgrade"""
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await self._test_asyncgen_base(self.MW_ASYNCGEN, self.MW_SIMPLE)
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@deferred_f_from_coro_f
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async def test_asyncgen_simple(self):
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"""Asyncgen mw -> simple mw; upgrade then downgrade"""
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await self._test_simple_base(self.MW_SIMPLE, self.MW_ASYNCGEN, downgrade=True)
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@deferred_f_from_coro_f
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async def test_universal(self):
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"""Universal mw"""
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await self._test_simple_base(self.MW_UNIVERSAL)
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@deferred_f_from_coro_f
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async def test_universal_simple(self):
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"""Universal mw -> simple mw"""
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await self._test_simple_base(self.MW_SIMPLE, self.MW_UNIVERSAL)
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@deferred_f_from_coro_f
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async def test_simple_universal(self):
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"""Simple mw -> universal mw"""
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await self._test_simple_base(self.MW_UNIVERSAL, self.MW_SIMPLE)
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@deferred_f_from_coro_f
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async def test_universal_asyncgen(self):
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"""Universal mw -> asyncgen mw; upgrade"""
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await self._test_asyncgen_base(self.MW_ASYNCGEN, self.MW_UNIVERSAL)
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@deferred_f_from_coro_f
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async def test_asyncgen_universal(self):
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"""Asyncgen mw -> universal mw; upgrade"""
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await self._test_asyncgen_base(self.MW_UNIVERSAL, self.MW_ASYNCGEN)
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class TestProcessSpiderOutputAsyncGen(TestProcessSpiderOutputSimple):
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"""process_spider_output tests for async generator callbacks"""
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async def _scrape_func(self, *args, **kwargs):
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for item in super()._scrape_func():
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yield item
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@deferred_f_from_coro_f
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async def test_simple(self):
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"""Simple mw; downgrade"""
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await self._test_simple_base(self.MW_SIMPLE, downgrade=True)
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@deferred_f_from_coro_f
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async def test_simple_asyncgen(self):
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"""Simple mw -> asyncgen mw; downgrade then upgrade"""
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await self._test_asyncgen_base(self.MW_ASYNCGEN, self.MW_SIMPLE, downgrade=True)
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@deferred_f_from_coro_f
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async def test_universal(self):
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"""Universal mw"""
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await self._test_asyncgen_base(self.MW_UNIVERSAL)
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@deferred_f_from_coro_f
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async def test_universal_simple(self):
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"""Universal mw -> simple mw; downgrade"""
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await self._test_simple_base(self.MW_SIMPLE, self.MW_UNIVERSAL, downgrade=True)
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@deferred_f_from_coro_f
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async def test_simple_universal(self):
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"""Simple mw -> universal mw; downgrade"""
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await self._test_simple_base(self.MW_UNIVERSAL, self.MW_SIMPLE, downgrade=True)
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class ProcessSpiderOutputNonIterableMiddleware:
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def process_spider_output(self, response, result, spider):
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return
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class ProcessSpiderOutputCoroutineMiddleware:
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async def process_spider_output(self, response, result, spider):
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return result
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class TestProcessSpiderOutputInvalidResult(TestBaseAsyncSpiderMiddleware):
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@deferred_f_from_coro_f
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async def test_non_iterable(self):
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with pytest.raises(
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_InvalidOutput,
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match=r"\.process_spider_output must return an iterable, got <class 'NoneType'>",
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):
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await self._get_middleware_result(ProcessSpiderOutputNonIterableMiddleware)
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@deferred_f_from_coro_f
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async def test_coroutine(self):
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with pytest.raises(
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_InvalidOutput,
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match=r"\.process_spider_output must be an asynchronous generator",
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):
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await self._get_middleware_result(ProcessSpiderOutputCoroutineMiddleware)
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class ProcessStartSimpleMiddleware:
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async def process_start(self, start):
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async for item_or_request in start:
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yield item_or_request
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class TestProcessStartSimple(TestBaseAsyncSpiderMiddleware):
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"""process_start tests for simple start"""
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ITEM_TYPE = (Request, dict)
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MW_SIMPLE = ProcessStartSimpleMiddleware
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async def _get_processed_start(
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self, *mw_classes: type[Any]
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) -> AsyncIterator[Any] | None:
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class TestSpider(Spider):
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name = "test"
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async def start(self):
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for i in range(2):
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yield Request(f"https://example.com/{i}", dont_filter=True)
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yield {"name": "test item"}
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setting = self._construct_mw_setting(*mw_classes)
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self.crawler = get_crawler(
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TestSpider, {"SPIDER_MIDDLEWARES_BASE": {}, "SPIDER_MIDDLEWARES": setting}
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)
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self.spider = self.crawler._create_spider()
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self.mwman = SpiderMiddlewareManager.from_crawler(self.crawler)
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return await self.mwman.process_start(self.spider)
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@deferred_f_from_coro_f
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async def test_simple(self):
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"""Simple mw"""
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start = await self._get_processed_start(self.MW_SIMPLE)
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assert isasyncgen(start)
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start_list = await collect_asyncgen(start)
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assert len(start_list) == self.RESULT_COUNT
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assert isinstance(start_list[0], self.ITEM_TYPE)
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class UniversalMiddlewareNoSync:
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async def process_spider_output_async(self, response, result, spider):
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yield
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class UniversalMiddlewareBothSync:
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def process_spider_output(self, response, result, spider):
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yield
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def process_spider_output_async(self, response, result, spider):
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yield
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class UniversalMiddlewareBothAsync:
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async def process_spider_output(self, response, result, spider):
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yield
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async def process_spider_output_async(self, response, result, spider):
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yield
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class TestUniversalMiddlewareManager:
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@pytest.fixture
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def mwman(self) -> SpiderMiddlewareManager:
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return SpiderMiddlewareManager()
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def test_simple_mw(self, mwman: SpiderMiddlewareManager) -> None:
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mw = ProcessSpiderOutputSimpleMiddleware()
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mwman._add_middleware(mw)
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assert (
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mwman.methods["process_spider_output"][0] == mw.process_spider_output # pylint: disable=comparison-with-callable
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)
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def test_async_mw(self, mwman: SpiderMiddlewareManager) -> None:
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mw = ProcessSpiderOutputAsyncGenMiddleware()
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mwman._add_middleware(mw)
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assert (
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mwman.methods["process_spider_output"][0] == mw.process_spider_output # pylint: disable=comparison-with-callable
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)
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def test_universal_mw(self, mwman: SpiderMiddlewareManager) -> None:
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mw = ProcessSpiderOutputUniversalMiddleware()
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mwman._add_middleware(mw)
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assert mwman.methods["process_spider_output"][0] == (
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mw.process_spider_output,
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mw.process_spider_output_async,
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)
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def test_universal_mw_no_sync(
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self, mwman: SpiderMiddlewareManager, caplog: pytest.LogCaptureFixture
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) -> None:
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mwman._add_middleware(UniversalMiddlewareNoSync())
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assert (
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"UniversalMiddlewareNoSync has process_spider_output_async"
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" without process_spider_output" in caplog.text
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)
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assert mwman.methods["process_spider_output"][0] is None
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def test_universal_mw_both_sync(
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self, mwman: SpiderMiddlewareManager, caplog: pytest.LogCaptureFixture
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) -> None:
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mw = UniversalMiddlewareBothSync()
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mwman._add_middleware(mw)
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assert (
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"UniversalMiddlewareBothSync.process_spider_output_async "
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"is not an async generator function" in caplog.text
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)
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assert (
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mwman.methods["process_spider_output"][0] == mw.process_spider_output # pylint: disable=comparison-with-callable
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)
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def test_universal_mw_both_async(
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self, mwman: SpiderMiddlewareManager, caplog: pytest.LogCaptureFixture
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) -> None:
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mwman._add_middleware(UniversalMiddlewareBothAsync())
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assert (
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"UniversalMiddlewareBothAsync.process_spider_output "
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"is an async generator function while process_spider_output_async exists"
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in caplog.text
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)
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assert mwman.methods["process_spider_output"][0] is None
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class TestBuiltinMiddlewareSimple(TestBaseAsyncSpiderMiddleware):
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ITEM_TYPE = dict
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MW_SIMPLE = ProcessSpiderOutputSimpleMiddleware
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MW_ASYNCGEN = ProcessSpiderOutputAsyncGenMiddleware
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MW_UNIVERSAL = ProcessSpiderOutputUniversalMiddleware
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async def _get_middleware_result(
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self, *mw_classes: type[Any], start_index: int | None = None
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) -> Any:
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setting = self._construct_mw_setting(*mw_classes, start_index=start_index)
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self.crawler = get_crawler(Spider, {"SPIDER_MIDDLEWARES": setting})
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self.spider = self.crawler._create_spider("foo")
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self.mwman = SpiderMiddlewareManager.from_crawler(self.crawler)
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return await self.mwman.scrape_response_async(
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self._scrape_func, self.response, self.request, self.spider
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)
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@deferred_f_from_coro_f
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async def test_just_builtin(self):
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await self._test_simple_base()
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@deferred_f_from_coro_f
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async def test_builtin_simple(self):
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await self._test_simple_base(self.MW_SIMPLE, start_index=1000)
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@deferred_f_from_coro_f
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async def test_builtin_async(self):
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"""Upgrade"""
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await self._test_asyncgen_base(self.MW_ASYNCGEN, start_index=1000)
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|
|
|
@deferred_f_from_coro_f
|
|
async def test_builtin_universal(self):
|
|
await self._test_simple_base(self.MW_UNIVERSAL, start_index=1000)
|
|
|
|
@deferred_f_from_coro_f
|
|
async def test_simple_builtin(self):
|
|
await self._test_simple_base(self.MW_SIMPLE)
|
|
|
|
@deferred_f_from_coro_f
|
|
async def test_async_builtin(self):
|
|
"""Upgrade"""
|
|
await self._test_asyncgen_base(self.MW_ASYNCGEN)
|
|
|
|
@deferred_f_from_coro_f
|
|
async def test_universal_builtin(self):
|
|
await self._test_simple_base(self.MW_UNIVERSAL)
|
|
|
|
|
|
class TestBuiltinMiddlewareAsyncGen(TestBuiltinMiddlewareSimple):
|
|
async def _scrape_func(self, *args, **kwargs):
|
|
for item in super()._scrape_func():
|
|
yield item
|
|
|
|
@deferred_f_from_coro_f
|
|
async def test_just_builtin(self):
|
|
await self._test_asyncgen_base()
|
|
|
|
@deferred_f_from_coro_f
|
|
async def test_builtin_simple(self):
|
|
"""Downgrade"""
|
|
await self._test_simple_base(self.MW_SIMPLE, downgrade=True, start_index=1000)
|
|
|
|
@deferred_f_from_coro_f
|
|
async def test_builtin_async(self):
|
|
await self._test_asyncgen_base(self.MW_ASYNCGEN, start_index=1000)
|
|
|
|
@deferred_f_from_coro_f
|
|
async def test_builtin_universal(self):
|
|
await self._test_asyncgen_base(self.MW_UNIVERSAL, start_index=1000)
|
|
|
|
@deferred_f_from_coro_f
|
|
async def test_simple_builtin(self):
|
|
"""Downgrade"""
|
|
await self._test_simple_base(self.MW_SIMPLE, downgrade=True)
|
|
|
|
@deferred_f_from_coro_f
|
|
async def test_async_builtin(self):
|
|
await self._test_asyncgen_base(self.MW_ASYNCGEN)
|
|
|
|
@deferred_f_from_coro_f
|
|
async def test_universal_builtin(self):
|
|
await self._test_asyncgen_base(self.MW_UNIVERSAL)
|
|
|
|
|
|
class TestProcessSpiderException(TestBaseAsyncSpiderMiddleware):
|
|
ITEM_TYPE = dict
|
|
MW_SIMPLE = ProcessSpiderOutputSimpleMiddleware
|
|
MW_ASYNCGEN = ProcessSpiderOutputAsyncGenMiddleware
|
|
MW_UNIVERSAL = ProcessSpiderOutputUniversalMiddleware
|
|
MW_EXC_SIMPLE = ProcessSpiderExceptionSimpleIterableMiddleware
|
|
MW_EXC_ASYNCGEN = ProcessSpiderExceptionAsyncIteratorMiddleware
|
|
|
|
def _scrape_func(self, *args, **kwargs):
|
|
1 / 0
|
|
|
|
async def _test_asyncgen_nodowngrade(self, *mw_classes: type[Any]) -> None:
|
|
with pytest.raises(
|
|
_InvalidOutput, match="Async iterable returned from .+ cannot be downgraded"
|
|
):
|
|
await self._get_middleware_result(*mw_classes)
|
|
|
|
@deferred_f_from_coro_f
|
|
async def test_exc_simple(self):
|
|
"""Simple exc mw"""
|
|
await self._test_simple_base(self.MW_EXC_SIMPLE)
|
|
|
|
@deferred_f_from_coro_f
|
|
async def test_exc_async(self):
|
|
"""Async exc mw"""
|
|
await self._test_asyncgen_base(self.MW_EXC_ASYNCGEN)
|
|
|
|
@deferred_f_from_coro_f
|
|
async def test_exc_simple_simple(self):
|
|
"""Simple exc mw -> simple output mw"""
|
|
await self._test_simple_base(self.MW_SIMPLE, self.MW_EXC_SIMPLE)
|
|
|
|
@deferred_f_from_coro_f
|
|
async def test_exc_async_async(self):
|
|
"""Async exc mw -> async output mw"""
|
|
await self._test_asyncgen_base(self.MW_ASYNCGEN, self.MW_EXC_ASYNCGEN)
|
|
|
|
@deferred_f_from_coro_f
|
|
async def test_exc_simple_async(self):
|
|
"""Simple exc mw -> async output mw; upgrade"""
|
|
await self._test_asyncgen_base(self.MW_ASYNCGEN, self.MW_EXC_SIMPLE)
|
|
|
|
@deferred_f_from_coro_f
|
|
async def test_exc_async_simple(self):
|
|
"""Async exc mw -> simple output mw; cannot work as downgrading is not supported"""
|
|
await self._test_asyncgen_nodowngrade(self.MW_SIMPLE, self.MW_EXC_ASYNCGEN)
|