Fixed #28606 -- Deprecated CachedStaticFilesStorage.

django/contrib/staticfiles/storage.py

@@ -3,6 +3,7 @@
 import os
 import posixpath
 import re
+import warnings
 from collections import OrderedDict
 from urllib.parse import unquote, urldefrag, urlsplit, urlunsplit
 
@@ -14,6 +15,7 @@
 from django.core.exceptions import ImproperlyConfigured
 from django.core.files.base import ContentFile
 from django.core.files.storage import FileSystemStorage, get_storage_class
+from django.utils.deprecation import RemovedInDjango31Warning
 from django.utils.functional import LazyObject
 
 
@@ -474,7 +476,13 @@ class CachedStaticFilesStorage(CachedFilesMixin, StaticFilesStorage):
     A static file system storage backend which also saves
     hashed copies of the files it saves.
     """
-    pass
+    def __init__(self, *args, **kwargs):
+        warnings.warn(
+            'CachedStaticFilesStorage is deprecated in favor of '
+            'ManifestStaticFilesStorage.',
+            RemovedInDjango31Warning, stacklevel=2,
+        )
+        super().__init__(*args, **kwargs)
 
 
 class ManifestStaticFilesStorage(ManifestFilesMixin, StaticFilesStorage):

docs/internals/deprecation.txt

@@ -26,6 +26,9 @@ details on these changes.
 
 * The ``FILE_CHARSET`` setting will be removed.
 
+* ``django.contrib.staticfiles.storage.CachedStaticFilesStorage`` will be
+  removed.
+
 .. _deprecation-removed-in-3.0:
 
 3.0

docs/ref/contrib/staticfiles.txt

@@ -62,7 +62,7 @@ The :djadmin:`collectstatic` management command calls the
 method of the :setting:`STATICFILES_STORAGE` after each run and passes
 a list of paths that have been found by the management command. It also
 receives all command line options of :djadmin:`collectstatic`. This is used
-by the :class:`~django.contrib.staticfiles.storage.CachedStaticFilesStorage`
+by the :class:`~django.contrib.staticfiles.storage.ManifestStaticFilesStorage`
 by default.
 
 By default, collected files receive permissions from
@@ -229,9 +229,7 @@ local development, should **never be used in production** and is only
 available if the :doc:`staticfiles </ref/contrib/staticfiles>` app is
 in your project's :setting:`INSTALLED_APPS` setting.
 
-``--insecure`` doesn't work with
-:class:`~django.contrib.staticfiles.storage.ManifestStaticFilesStorage` or
-:class:`~django.contrib.staticfiles.storage.CachedStaticFilesStorage`.
+``--insecure`` doesn't work with :class:`~.storage.ManifestStaticFilesStorage`.
 
 Example usage::
 
@@ -262,7 +260,7 @@ line options. It yields tuples of three values:
 ``processed`` is a boolean indicating whether or not the value was
 post-processed, or an exception if post-processing failed.
 
-The :class:`~django.contrib.staticfiles.storage.CachedStaticFilesStorage`
+The :class:`~django.contrib.staticfiles.storage.ManifestStaticFilesStorage`
 uses this behind the scenes to replace the paths with their hashed
 counterparts and update the cache appropriately.
 
@@ -362,6 +360,13 @@ hashing algorithm.
 
 .. class:: storage.CachedStaticFilesStorage
 
+.. deprecated:: 2.1
+
+    ``CachedStaticFilesStorage`` is deprecated as it has some intractable
+    problems, some of which are outlind below. Use
+    :class:`~storage.ManifestStaticFilesStorage` or a third-party cloud storage
+    instead.
+
 ``CachedStaticFilesStorage`` is a similar class like the
 :class:`~django.contrib.staticfiles.storage.ManifestStaticFilesStorage` class
 but uses Django's :doc:`caching framework</topics/cache>` for storing the

docs/releases/1.4.txt

@@ -466,15 +466,12 @@ files from a cloud service<staticfiles-from-cdn>`.
 --------------------------------------------
 
 The :mod:`staticfiles<django.contrib.staticfiles>` contrib app now has a
-:class:`~django.contrib.staticfiles.storage.CachedStaticFilesStorage` backend
+``django.contrib.staticfiles.storage.CachedStaticFilesStorage`` backend
 that caches the files it saves (when running the :djadmin:`collectstatic`
 management command) by appending the MD5 hash of the file's content to the
 filename. For example, the file ``css/styles.css`` would also be saved as
 ``css/styles.55e7cbb9ba48.css``
 
-See the :class:`~django.contrib.staticfiles.storage.CachedStaticFilesStorage`
-docs for more information.
-
 Simple clickjacking protection
 ------------------------------
 

docs/releases/1.7.txt

@@ -506,8 +506,7 @@ Minor features
   and :attr:`~django.core.files.storage.FileSystemStorage.directory_permissions_mode`
   parameters. See :djadmin:`collectstatic` for example usage.
 
-* The :class:`~django.contrib.staticfiles.storage.CachedStaticFilesStorage`
-  backend gets a sibling class called
+* The ``CachedStaticFilesStorage`` backend gets a sibling class called
   :class:`~django.contrib.staticfiles.storage.ManifestStaticFilesStorage`
   that doesn't use the cache system at all but instead a JSON file called
   ``staticfiles.json`` for storing the mapping between the original file name

docs/releases/2.2.txt

@@ -354,3 +354,7 @@ Miscellaneous
 
 * The ``FILE_CHARSET`` setting is deprecated. Starting with Django 3.1, files
   read from disk must be UTF-8 encoded.
+
+* ``django.contrib.staticfiles.storage.CachedStaticFilesStorage`` is
+  deprecated due to the intractable problems that is has. Use
+  :class:`.ManifestStaticFilesStorage` or a third-party cloud storage instead.

docs/topics/performance.txt

@@ -290,13 +290,13 @@ Static files
 Static files, which by definition are not dynamic, make an excellent target for
 optimization gains.
 
-:class:`~django.contrib.staticfiles.storage.CachedStaticFilesStorage`
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+:class:`~django.contrib.staticfiles.storage.ManifestStaticFilesStorage`
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
 By taking advantage of web browsers' caching abilities, you can
 eliminate network hits entirely for a given file after the initial download.
 
-:class:`~django.contrib.staticfiles.storage.CachedStaticFilesStorage` appends a
+:class:`~django.contrib.staticfiles.storage.ManifestStaticFilesStorage` appends a
 content-dependent tag to the filenames of :doc:`static files
 </ref/contrib/staticfiles>` to make it safe for browsers to cache them
 long-term without missing future changes - when a file changes, so will the

tests/staticfiles_tests/storage.py

@@ -2,7 +2,7 @@
 from datetime import datetime, timedelta
 
 from django.conf import settings
-from django.contrib.staticfiles.storage import CachedStaticFilesStorage
+from django.contrib.staticfiles.storage import ManifestStaticFilesStorage
 from django.core.files import storage
 from django.utils import timezone
 
@@ -70,18 +70,18 @@ def url(self, path):
         return path + '?a=b&c=d'
 
 
-class SimpleCachedStaticFilesStorage(CachedStaticFilesStorage):
+class SimpleStorage(ManifestStaticFilesStorage):
 
     def file_hash(self, name, content=None):
         return 'deploy12345'
 
 
-class ExtraPatternsCachedStaticFilesStorage(CachedStaticFilesStorage):
+class ExtraPatternsStorage(ManifestStaticFilesStorage):
     """
     A storage class to test pattern substitutions with more than one pattern
     entry. The added pattern rewrites strings like "url(...)" to JS_URL("...").
     """
-    patterns = tuple(CachedStaticFilesStorage.patterns) + (
+    patterns = tuple(ManifestStaticFilesStorage.patterns) + (
         (
             "*.js", (
                 (r"""(url\(['"]{0,1}\s*(.*?)["']{0,1}\))""", 'JS_URL("%s")'),

tests/staticfiles_tests/test_management.py

@@ -201,13 +201,13 @@ def test_verbosity_2(self):
         self.assertIn(self.staticfiles_copied_msg, output)
         self.assertIn(self.copying_msg, output)
 
-    @override_settings(STATICFILES_STORAGE='django.contrib.staticfiles.storage.CachedStaticFilesStorage')
+    @override_settings(STATICFILES_STORAGE='django.contrib.staticfiles.storage.ManifestStaticFilesStorage')
     def test_verbosity_1_with_post_process(self):
         stdout = StringIO()
         self.run_collectstatic(verbosity=1, stdout=stdout, post_process=True)
         self.assertNotIn(self.post_process_msg, stdout.getvalue())
 
-    @override_settings(STATICFILES_STORAGE='django.contrib.staticfiles.storage.CachedStaticFilesStorage')
+    @override_settings(STATICFILES_STORAGE='django.contrib.staticfiles.storage.ManifestStaticFilesStorage')
     def test_verbosity_2_with_post_process(self):
         stdout = StringIO()
         self.run_collectstatic(verbosity=2, stdout=stdout, post_process=True)

tests/staticfiles_tests/test_storage.py

@@ -12,7 +12,8 @@
 )
 from django.core.cache.backends.base import BaseCache
 from django.core.management import call_command
-from django.test import override_settings
+from django.test import SimpleTestCase, ignore_warnings, override_settings
+from django.utils.deprecation import RemovedInDjango31Warning
 
 from .cases import CollectionTestCase
 from .settings import TEST_ROOT
@@ -43,9 +44,6 @@ def assertPostCondition(self):
         pass
 
     def test_template_tag_return(self):
-        """
-        Test the CachedStaticFilesStorage backend.
-        """
         self.assertStaticRaises(ValueError, "does/not/exist.png", "/static/does/not/exist.png")
         self.assertStaticRenders("test/file.txt", "/static/test/file.dad0999e4f8f.txt")
         self.assertStaticRenders("test/file.txt", "/static/test/file.dad0999e4f8f.txt", asvar=True)
@@ -232,13 +230,15 @@ def test_post_processing_failure(self):
         self.assertPostCondition()
 
 
+@ignore_warnings(category=RemovedInDjango31Warning)
 @override_settings(
     STATICFILES_STORAGE='django.contrib.staticfiles.storage.CachedStaticFilesStorage',
 )
 class TestCollectionCachedStorage(TestHashedFiles, CollectionTestCase):
     """
     Tests for the Cache busting storage
     """
+    @ignore_warnings(category=RemovedInDjango31Warning)
     def test_cache_invalidation(self):
         name = "cached/styles.css"
         hashed_name = "cached/styles.5e0040571e1a.css"
@@ -282,6 +282,7 @@ def test_cache_key_memcache_validation(self):
         cache_validator.validate_key(cache_key)
         self.assertEqual(cache_key, 'staticfiles:821ea71ef36f95b3922a77f7364670e7')
 
+    @ignore_warnings(category=RemovedInDjango31Warning)
     def test_corrupt_intermediate_files(self):
         configured_storage = storage.staticfiles_storage
         # Clear cache to force rehashing of the files
@@ -299,10 +300,20 @@ def test_corrupt_intermediate_files(self):
             self.hashed_file_path('cached/styles.css')
 
 
-@override_settings(
-    STATICFILES_STORAGE='staticfiles_tests.storage.ExtraPatternsCachedStaticFilesStorage',
-)
-class TestExtraPatternsCachedStorage(CollectionTestCase):
+class TestCachedStaticFilesStorageDeprecation(SimpleTestCase):
+    def test_warning(self):
+        from django.contrib.staticfiles.storage import CachedStaticFilesStorage
+        from django.utils.deprecation import RemovedInDjango31Warning
+        msg = (
+            'CachedStaticFilesStorage is deprecated in favor of '
+            'ManifestStaticFilesStorage.'
+        )
+        with self.assertRaisesMessage(RemovedInDjango31Warning, msg):
+            CachedStaticFilesStorage()
+
+
+@override_settings(STATICFILES_STORAGE='staticfiles_tests.storage.ExtraPatternsStorage')
+class TestExtraPatternsStorage(CollectionTestCase):
 
     def setUp(self):
         storage.staticfiles_storage.hashed_files.clear()  # avoid cache interference
@@ -437,23 +448,15 @@ def test_missing_entry(self):
         self.hashed_file_path(missing_file_name)
 
 
-@override_settings(
-    STATICFILES_STORAGE='staticfiles_tests.storage.SimpleCachedStaticFilesStorage',
-)
-class TestCollectionSimpleCachedStorage(CollectionTestCase):
-    """
-    Tests for the Cache busting storage
-    """
+@override_settings(STATICFILES_STORAGE='staticfiles_tests.storage.SimpleStorage')
+class TestCollectionSimpleStorage(CollectionTestCase):
     hashed_file_path = hashed_file_path
 
     def setUp(self):
         storage.staticfiles_storage.hashed_files.clear()  # avoid cache interference
         super().setUp()
 
     def test_template_tag_return(self):
-        """
-        Test the CachedStaticFilesStorage backend.
-        """
         self.assertStaticRaises(ValueError, "does/not/exist.png", "/static/does/not/exist.png")
         self.assertStaticRenders("test/file.txt", "/static/test/file.deploy12345.txt")
         self.assertStaticRenders("cached/styles.css", "/static/cached/styles.deploy12345.css")
@@ -543,7 +546,7 @@ def test_collect_static_files_subclass_of_static_storage(self):
 
 
 @override_settings(
-    STATICFILES_STORAGE='django.contrib.staticfiles.storage.CachedStaticFilesStorage',
+    STATICFILES_STORAGE='django.contrib.staticfiles.storage.ManifestStaticFilesStorage',
 )
 class TestCollectionHashedFilesCache(CollectionTestCase):
     """

tests/test_utils/tests.py

@@ -1092,7 +1092,7 @@ def test_override_staticfiles_storage(self):
         Overriding the STATICFILES_STORAGE setting should be reflected in
         the value of django.contrib.staticfiles.storage.staticfiles_storage.
         """
-        new_class = 'CachedStaticFilesStorage'
+        new_class = 'ManifestStaticFilesStorage'
         new_storage = 'django.contrib.staticfiles.storage.' + new_class
         with self.settings(STATICFILES_STORAGE=new_storage):
             self.assertEqual(staticfiles_storage.__class__.__name__, new_class)