#17896: Implement file hash computation as a separate method of staticfiles'
CachedFilesMixin
-------------------------------------+-------------------------------------
Reporter: mkai | Owner: nobody
Type: | Status: new
Cleanup/optimization | Version: SVN
Component: contrib.staticfiles | Keywords:
Severity: Normal | CachedStaticFilesStorage, hash, md5
Triage Stage: Unreviewed | Has patch: 1
Easy pickings: 0 | UI/UX: 0
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I'm currently extending django-cumulus (Rackspace Cloud Files storage
backend) and S3BotoStorage (Amazon S3 storage backend) to use hashed file
names using the CachedFilesMixin of contrib.staticfiles. That came down to
(as intended, I suppose!):
{{{
class MyCachedCloudFilesStorage(CachedFilesMixin, CloudFilesStorage):
pass
}}}
Now I noticed that both Amazon and Rackspace include file hashes for each
file in their API responses. It the response (e. g. a file list) is cached
appropriately, the post-processing of the CachedFilesMixin can be sped up
dramatically by just getting the hash from the cached response instead of
calculating it from the file (which is expensive because it reads the file
over the network).
I propose the attached patch so that backend authors can implement their
own method of getting the hash for a file:
{{{
diff --git a/django/contrib/staticfiles/storage.py
b/django/contrib/staticfiles/storage.py
index c000f97..e59b987 100644
--- a/django/contrib/staticfiles/storage.py
+++ b/django/contrib/staticfiles/storage.py
@@ -65,6 +65,13 @@ class CachedFilesMixin(object):
compiled = re.compile(pattern)
self._patterns.setdefault(extension, []).append(compiled)
+ def get_file_hash(self, name, content=None):
+ """Gets the MD5 hash of the file."""
+ md5 = hashlib.md5()
+ for chunk in content.chunks():
+ md5.update(chunk)
+ return md5.hexdigest()[:12]
+
def hashed_name(self, name, content=None):
parsed_name = urlsplit(unquote(name))
clean_name = parsed_name.path.strip()
@@ -79,13 +86,9 @@ class CachedFilesMixin(object):
return name
path, filename = os.path.split(clean_name)
root, ext = os.path.splitext(filename)
- # Get the MD5 hash of the file
- md5 = hashlib.md5()
- for chunk in content.chunks():
- md5.update(chunk)
- md5sum = md5.hexdigest()[:12]
+ file_hash = self.get_file_hash(clean_name, content)
hashed_name = os.path.join(path, u"%s.%s%s" %
- (root, md5sum, ext))
+ (root, file_hash, ext))
}}}
--
Ticket URL: <https://code.djangoproject.com/ticket/17896>
Django <https://code.djangoproject.com/>
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