author | Sverre Rabbelier <srabbelier@gmail.com> |
Sat, 15 Nov 2008 16:17:11 +0000 | |
changeset 482 | 839740b061ad |
parent 323 | ff1a9aa48cfd |
permissions | -rw-r--r-- |
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""" |
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Cache middleware. If enabled, each Django-powered page will be cached based on |
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URL. The canonical way to enable cache middleware is to set |
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``UpdateCacheMiddleware`` as your first piece of middleware, and |
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``FetchFromCacheMiddleware`` as the last:: |
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MIDDLEWARE_CLASSES = [ |
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'django.middleware.cache.UpdateCacheMiddleware', |
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... |
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'django.middleware.cache.FetchFromCacheMiddleware' |
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] |
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This is counter-intuitive, but correct: ``UpdateCacheMiddleware`` needs to run |
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last during the response phase, which processes middleware bottom-up; |
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``FetchFromCacheMiddleware`` needs to run last during the request phase, which |
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processes middleware top-down. |
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The single-class ``CacheMiddleware`` can be used for some simple sites. |
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However, if any other piece of middleware needs to affect the cache key, you'll |
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need to use the two-part ``UpdateCacheMiddleware`` and |
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``FetchFromCacheMiddleware``. This'll most often happen when you're using |
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Django's ``LocaleMiddleware``. |
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More details about how the caching works: |
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* Only parameter-less GET or HEAD-requests with status code 200 are cached. |
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* The number of seconds each page is stored for is set by the "max-age" section |
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of the response's "Cache-Control" header, falling back to the |
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CACHE_MIDDLEWARE_SECONDS setting if the section was not found. |
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* If CACHE_MIDDLEWARE_ANONYMOUS_ONLY is set to True, only anonymous requests |
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(i.e., those not made by a logged-in user) will be cached. This is a simple |
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and effective way of avoiding the caching of the Django admin (and any other |
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user-specific content). |
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* This middleware expects that a HEAD request is answered with a response |
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exactly like the corresponding GET request. |
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* When a hit occurs, a shallow copy of the original response object is returned |
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from process_request. |
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* Pages will be cached based on the contents of the request headers listed in |
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the response's "Vary" header. |
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* This middleware also sets ETag, Last-Modified, Expires and Cache-Control |
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headers on the response object. |
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""" |
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from django.conf import settings |
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from django.core.cache import cache |
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from django.utils.cache import get_cache_key, learn_cache_key, patch_response_headers, get_max_age |
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class UpdateCacheMiddleware(object): |
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""" |
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Response-phase cache middleware that updates the cache if the response is |
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cacheable. |
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Must be used as part of the two-part update/fetch cache middleware. |
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UpdateCacheMiddleware must be the first piece of middleware in |
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MIDDLEWARE_CLASSES so that it'll get called last during the response phase. |
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""" |
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def __init__(self): |
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self.cache_timeout = settings.CACHE_MIDDLEWARE_SECONDS |
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self.key_prefix = settings.CACHE_MIDDLEWARE_KEY_PREFIX |
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self.cache_anonymous_only = getattr(settings, 'CACHE_MIDDLEWARE_ANONYMOUS_ONLY', False) |
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def process_response(self, request, response): |
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"""Sets the cache, if needed.""" |
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if not hasattr(request, '_cache_update_cache') or not request._cache_update_cache: |
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# We don't need to update the cache, just return. |
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return response |
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if request.method != 'GET': |
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# This is a stronger requirement than above. It is needed |
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# because of interactions between this middleware and the |
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# HTTPMiddleware, which throws the body of a HEAD-request |
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# away before this middleware gets a chance to cache it. |
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return response |
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if not response.status_code == 200: |
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return response |
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# Try to get the timeout from the "max-age" section of the "Cache- |
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# Control" header before reverting to using the default cache_timeout |
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# length. |
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timeout = get_max_age(response) |
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if timeout == None: |
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timeout = self.cache_timeout |
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elif timeout == 0: |
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# max-age was set to 0, don't bother caching. |
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return response |
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patch_response_headers(response, timeout) |
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if timeout: |
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cache_key = learn_cache_key(request, response, timeout, self.key_prefix) |
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cache.set(cache_key, response, timeout) |
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return response |
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class FetchFromCacheMiddleware(object): |
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""" |
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Request-phase cache middleware that fetches a page from the cache. |
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Must be used as part of the two-part update/fetch cache middleware. |
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FetchFromCacheMiddleware must be the last piece of middleware in |
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MIDDLEWARE_CLASSES so that it'll get called last during the request phase. |
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""" |
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105 |
def __init__(self): |
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self.cache_timeout = settings.CACHE_MIDDLEWARE_SECONDS |
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self.key_prefix = settings.CACHE_MIDDLEWARE_KEY_PREFIX |
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self.cache_anonymous_only = getattr(settings, 'CACHE_MIDDLEWARE_ANONYMOUS_ONLY', False) |
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109 |
|
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110 |
def process_request(self, request): |
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111 |
""" |
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112 |
Checks whether the page is already cached and returns the cached |
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113 |
version if available. |
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114 |
""" |
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if self.cache_anonymous_only: |
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116 |
assert hasattr(request, 'user'), "The Django cache middleware with CACHE_MIDDLEWARE_ANONYMOUS_ONLY=True requires authentication middleware to be installed. Edit your MIDDLEWARE_CLASSES setting to insert 'django.contrib.auth.middleware.AuthenticationMiddleware' before the CacheMiddleware." |
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117 |
|
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118 |
if not request.method in ('GET', 'HEAD') or request.GET: |
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119 |
request._cache_update_cache = False |
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120 |
return None # Don't bother checking the cache. |
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121 |
|
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if self.cache_anonymous_only and request.user.is_authenticated(): |
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123 |
request._cache_update_cache = False |
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124 |
return None # Don't cache requests from authenticated users. |
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125 |
|
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cache_key = get_cache_key(request, self.key_prefix) |
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127 |
if cache_key is None: |
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128 |
request._cache_update_cache = True |
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129 |
return None # No cache information available, need to rebuild. |
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130 |
|
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response = cache.get(cache_key, None) |
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132 |
if response is None: |
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133 |
request._cache_update_cache = True |
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134 |
return None # No cache information available, need to rebuild. |
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135 |
|
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136 |
request._cache_update_cache = False |
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137 |
return response |
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138 |
|
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139 |
class CacheMiddleware(UpdateCacheMiddleware, FetchFromCacheMiddleware): |
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140 |
""" |
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141 |
Cache middleware that provides basic behavior for many simple sites. |
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142 |
|
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143 |
Also used as the hook point for the cache decorator, which is generated |
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144 |
using the decorator-from-middleware utility. |
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145 |
""" |
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146 |
def __init__(self, cache_timeout=None, key_prefix=None, cache_anonymous_only=None): |
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self.cache_timeout = cache_timeout |
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148 |
if cache_timeout is None: |
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149 |
self.cache_timeout = settings.CACHE_MIDDLEWARE_SECONDS |
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self.key_prefix = key_prefix |
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151 |
if key_prefix is None: |
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self.key_prefix = settings.CACHE_MIDDLEWARE_KEY_PREFIX |
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153 |
if cache_anonymous_only is None: |
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self.cache_anonymous_only = getattr(settings, 'CACHE_MIDDLEWARE_ANONYMOUS_ONLY', False) |
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155 |
else: |
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156 |
self.cache_anonymous_only = cache_anonymous_only |