Automated merge with http://hg.scrapy.org/scrapy-0.9

docs/topics/downloader-middleware.rst

@@ -276,6 +276,17 @@ Number of seconds to use for HTTP cache expiration. Requests that were cached
 before this time will be re-downloaded. If zero, cached requests will always
 expire. A negative number means requests will never expire.
 
+.. setting:: HTTPCACHE_IGNORE_HTTP_CODES
+
+HTTPCACHE_IGNORE_HTTP_CODES
+^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+.. versionadded:: 0.10
+
+Default: ``[]``
+
+Don't cache response with these HTTP codes.
+
 .. setting:: HTTPCACHE_IGNORE_MISSING
 
 HTTPCACHE_IGNORE_MISSING

scrapy/__init__.py

@@ -2,8 +2,8 @@
 Scrapy - a screen scraping framework written in Python
 """
 
-version_info = (0, 9, 0, '')
+version_info = (0, 10, 0, 'dev')
-__version__ = "0.9"
+__version__ = "0.10-dev"
 
 import sys, os, warnings
 

scrapy/conf/default_settings.py

@@ -123,6 +123,7 @@ HTTPCACHE_DIR = ''
 HTTPCACHE_IGNORE_MISSING = False
 HTTPCACHE_STORAGE = 'scrapy.contrib.downloadermiddleware.httpcache.FilesystemCacheStorage'
 HTTPCACHE_EXPIRATION_SECS = 0
+HTTPCACHE_IGNORE_HTTP_CODES = []
 
 ITEM_PROCESSOR = 'scrapy.contrib.pipeline.ItemPipelineManager'
 

scrapy/contrib/downloadermiddleware/httpcache.py

@@ -22,6 +22,7 @@ class HttpCacheMiddleware(object):
     def __init__(self, settings=conf.settings):
         self.storage = load_object(settings['HTTPCACHE_STORAGE'])(settings)
         self.ignore_missing = settings.getbool('HTTPCACHE_IGNORE_MISSING')
+        self.ignore_http_codes = map(int, settings.getlist('HTTPCACHE_IGNORE_HTTP_CODES'))
         dispatcher.connect(self.spider_opened, signal=signals.spider_opened)
         dispatcher.connect(self.spider_closed, signal=signals.spider_closed)
 
@@ -35,17 +36,20 @@ class HttpCacheMiddleware(object):
         if not self.is_cacheable(request):
             return
         response = self.storage.retrieve_response(spider, request)
-        if response:
+        if response and self.is_cacheable_response(response):
             response.flags.append('cached')
             return response
         elif self.ignore_missing:
             raise IgnoreRequest("Ignored request not in cache: %s" % request)
 
     def process_response(self, request, response, spider):
-        if self.is_cacheable(request):
+        if self.is_cacheable(request) and self.is_cacheable_response(response):
             self.storage.store_response(spider, request, response)
         return response
 
+    def is_cacheable_response(self, response):
+        return response.status not in self.ignore_http_codes
+
     def is_cacheable(self, request):
         return urlparse_cached(request).scheme in ['http', 'https']
 

scrapy/tests/test_downloadermiddleware_httpcache.py

@@ -24,6 +24,7 @@ class HttpCacheMiddlewareTest(unittest.TestCase):
         settings = {
             'HTTPCACHE_DIR': self.tmpdir,
             'HTTPCACHE_EXPIRATION_SECS': 1,
+            'HTTPCACHE_IGNORE_HTTP_CODES': [],
         }
         settings.update(new_settings)
         return Settings(settings)
@@ -76,6 +77,22 @@ class HttpCacheMiddlewareTest(unittest.TestCase):
         self.assertEqualResponse(self.response, response)
         assert 'cached' in response.flags
 
+    def test_middleware_ignore_http_codes(self):
+        # test response is not cached
+        mw = self._get_middleware(HTTPCACHE_IGNORE_HTTP_CODES=[202])
+        assert mw.process_request(self.request, self.spider) is None
+        mw.process_response(self.request, self.response, self.spider)
+        assert mw.storage.retrieve_response(self.spider, self.request) is None
+        assert mw.process_request(self.request, self.spider) is None
+
+        # test response is cached
+        mw = self._get_middleware(HTTPCACHE_IGNORE_HTTP_CODES=[203])
+        mw.process_response(self.request, self.response, self.spider)
+        response = mw.process_request(self.request, self.spider)
+        assert isinstance(response, HtmlResponse)
+        self.assertEqualResponse(self.response, response)
+        assert 'cached' in response.flags
+
     def assertEqualResponse(self, response1, response2):
         self.assertEqual(response1.url, response2.url)
         self.assertEqual(response1.status, response2.status)