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import asyncio
from unittest import mock
from pytest import mark
from twisted.internet import defer
from twisted.internet.defer import Deferred
from twisted.trial.unittest import TestCase
from twisted.python.failure import Failure
from scrapy.http import Request, Response
from scrapy.spiders import Spider
from scrapy.exceptions import _InvalidOutput
from scrapy.core.downloader.middleware import DownloaderMiddlewareManager
from scrapy.utils.test import get_crawler, get_from_asyncio_queue
from scrapy.utils.python import to_bytes
class ManagerTestCase(TestCase):
settings_dict = None
def setUp(self):
self.crawler = get_crawler(Spider, self.settings_dict)
self.spider = self.crawler._create_spider('foo')
self.mwman = DownloaderMiddlewareManager.from_crawler(self.crawler)
# some mw depends on stats collector
self.crawler.stats.open_spider(self.spider)
return self.mwman.open_spider(self.spider)
def tearDown(self):
self.crawler.stats.close_spider(self.spider, '')
return self.mwman.close_spider(self.spider)
def _download(self, request, response=None):
"""Executes downloader mw manager's download method and returns
the result (Request or Response) or raise exception in case of
failure.
"""
if not response:
response = Response(request.url)
def download_func(**kwargs):
return response
dfd = self.mwman.download(download_func, request, self.spider)
# catch deferred result and return the value
results = []
dfd.addBoth(results.append)
self._wait(dfd)
ret = results[0]
if isinstance(ret, Failure):
ret.raiseException()
return ret
class DefaultsTest(ManagerTestCase):
"""Tests default behavior with default settings"""
def test_request_response(self):
req = Request('http://example.com/index.html')
resp = Response(req.url, status=200)
ret = self._download(req, resp)
self.assertTrue(isinstance(ret, Response), "Non-response returned")
def test_3xx_and_invalid_gzipped_body_must_redirect(self):
"""Regression test for a failure when redirecting a compressed
request.
This happens when httpcompression middleware is executed before redirect
middleware and attempts to decompress a non-compressed body.
In particular when some website returns a 30x response with header
'Content-Encoding: gzip' giving as result the error below:
exceptions.IOError: Not a gzipped file
"""
req = Request('http://example.com')
body = b'<p>You are being redirected</p>'
resp = Response(req.url, status=302, body=body, headers={
'Content-Length': str(len(body)),
'Content-Type': 'text/html',
'Content-Encoding': 'gzip',
'Location': 'http://example.com/login',
})
ret = self._download(request=req, response=resp)
self.assertTrue(isinstance(ret, Request),
f"Not redirected: {ret!r}")
self.assertEqual(to_bytes(ret.url), resp.headers['Location'],
"Not redirected to location header")
def test_200_and_invalid_gzipped_body_must_fail(self):
req = Request('http://example.com')
body = b'<p>You are being redirected</p>'
resp = Response(req.url, status=200, body=body, headers={
'Content-Length': str(len(body)),
'Content-Type': 'text/html',
'Content-Encoding': 'gzip',
'Location': 'http://example.com/login',
})
self.assertRaises(IOError, self._download, request=req, response=resp)
class ResponseFromProcessRequestTest(ManagerTestCase):
"""Tests middleware returning a response from process_request."""
def test_download_func_not_called(self):
resp = Response('http://example.com/index.html')
class ResponseMiddleware:
def process_request(self, request, spider):
return resp
self.mwman._add_middleware(ResponseMiddleware())
req = Request('http://example.com/index.html')
download_func = mock.MagicMock()
dfd = self.mwman.download(download_func, req, self.spider)
results = []
dfd.addBoth(results.append)
self._wait(dfd)
self.assertIs(results[0], resp)
self.assertFalse(download_func.called)
class ProcessRequestInvalidOutput(ManagerTestCase):
"""Invalid return value for process_request method should raise an exception"""
def test_invalid_process_request(self):
req = Request('http://example.com/index.html')
class InvalidProcessRequestMiddleware:
def process_request(self, request, spider):
return 1
self.mwman._add_middleware(InvalidProcessRequestMiddleware())
download_func = mock.MagicMock()
dfd = self.mwman.download(download_func, req, self.spider)
results = []
dfd.addBoth(results.append)
self.assertIsInstance(results[0], Failure)
self.assertIsInstance(results[0].value, _InvalidOutput)
class ProcessResponseInvalidOutput(ManagerTestCase):
"""Invalid return value for process_response method should raise an exception"""
def test_invalid_process_response(self):
req = Request('http://example.com/index.html')
class InvalidProcessResponseMiddleware:
def process_response(self, request, response, spider):
return 1
self.mwman._add_middleware(InvalidProcessResponseMiddleware())
download_func = mock.MagicMock()
dfd = self.mwman.download(download_func, req, self.spider)
results = []
dfd.addBoth(results.append)
self.assertIsInstance(results[0], Failure)
self.assertIsInstance(results[0].value, _InvalidOutput)
class ProcessExceptionInvalidOutput(ManagerTestCase):
"""Invalid return value for process_exception method should raise an exception"""
def test_invalid_process_exception(self):
req = Request('http://example.com/index.html')
class InvalidProcessExceptionMiddleware:
def process_request(self, request, spider):
raise Exception()
def process_exception(self, request, exception, spider):
return 1
self.mwman._add_middleware(InvalidProcessExceptionMiddleware())
download_func = mock.MagicMock()
dfd = self.mwman.download(download_func, req, self.spider)
results = []
dfd.addBoth(results.append)
self.assertIsInstance(results[0], Failure)
self.assertIsInstance(results[0].value, _InvalidOutput)
class MiddlewareUsingDeferreds(ManagerTestCase):
"""Middlewares using Deferreds should work"""
def test_deferred(self):
resp = Response('http://example.com/index.html')
class DeferredMiddleware:
def cb(self, result):
return result
def process_request(self, request, spider):
d = Deferred()
d.addCallback(self.cb)
d.callback(resp)
return d
self.mwman._add_middleware(DeferredMiddleware())
req = Request('http://example.com/index.html')
download_func = mock.MagicMock()
dfd = self.mwman.download(download_func, req, self.spider)
results = []
dfd.addBoth(results.append)
self._wait(dfd)
self.assertIs(results[0], resp)
self.assertFalse(download_func.called)
class MiddlewareUsingCoro(ManagerTestCase):
"""Middlewares using asyncio coroutines should work"""
def test_asyncdef(self):
resp = Response('http://example.com/index.html')
class CoroMiddleware:
async def process_request(self, request, spider):
await defer.succeed(42)
return resp
self.mwman._add_middleware(CoroMiddleware())
req = Request('http://example.com/index.html')
download_func = mock.MagicMock()
dfd = self.mwman.download(download_func, req, self.spider)
results = []
dfd.addBoth(results.append)
self._wait(dfd)
self.assertIs(results[0], resp)
self.assertFalse(download_func.called)
@mark.only_asyncio()
def test_asyncdef_asyncio(self):
resp = Response('http://example.com/index.html')
class CoroMiddleware:
async def process_request(self, request, spider):
await asyncio.sleep(0.1)
result = await get_from_asyncio_queue(resp)
return result
self.mwman._add_middleware(CoroMiddleware())
req = Request('http://example.com/index.html')
download_func = mock.MagicMock()
dfd = self.mwman.download(download_func, req, self.spider)
results = []
dfd.addBoth(results.append)
self._wait(dfd)
self.assertIs(results[0], resp)
self.assertFalse(download_func.called)
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