90 lines
3.6 KiB
Plaintext
90 lines
3.6 KiB
Plaintext
.. _remote_storages:
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Remote storages
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---------------
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In some cases it's useful to use a CDN_ for serving static files such as
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those generated by Django Compressor. Due to the way Django Compressor
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processes files, it requires the files to be processed (in the
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``{% compress %}`` block) to be available in a local file system cache.
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Django Compressor provides hooks to automatically have compressed files
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pushed to a remote storage backend. Simply set the storage backend
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that saves the result to a remote service (see
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:attr:`~django.conf.settings.COMPRESS_STORAGE`).
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django-storages
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^^^^^^^^^^^^^^^
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So assuming your CDN is `Amazon S3`_, you can use the boto_ storage backend
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from the 3rd party app `django-storages`_. Some required settings are::
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AWS_ACCESS_KEY_ID = 'XXXXXXXXXXXXXXXXXXXXX'
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AWS_SECRET_ACCESS_KEY = 'XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX'
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AWS_STORAGE_BUCKET_NAME = 'compressor-test'
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Next, you need to specify the new CDN base URL and update the URLs to the
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files in your templates which you want to compress::
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COMPRESS_URL = "http://compressor-test.s3.amazonaws.com/"
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.. note::
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For staticfiles just set ``STATIC_URL = COMPRESS_URL``
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The storage backend to save the compressed files needs to be changed, too::
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COMPRESS_STORAGE = 'storages.backends.s3boto.S3BotoStorage'
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Using staticfiles
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^^^^^^^^^^^^^^^^^
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If you are using Django's staticfiles_ contrib app, you'll need to use a
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temporary filesystem cache for Django Compressor to know which files to
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compress. Since staticfiles provides a management command to collect static
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files from various locations which uses a storage backend, this is where both
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apps can be integrated.
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#. Make sure the :attr:`~django.conf.settings.COMPRESS_ROOT` and STATIC_ROOT_
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settings are equal since both apps need to look at the same directories
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when to do their job.
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#. You need to create a subclass of the remote storage backend you want
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to use; below is an example of the boto S3 storage backend from
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django-storages_::
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from django.core.files.storage import get_storage_class
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from storages.backends.s3boto import S3BotoStorage
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class CachedS3BotoStorage(S3BotoStorage):
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"""
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S3 storage backend that saves the files locally, too.
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"""
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def __init__(self, *args, **kwargs):
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super(CachedS3BotoStorage, self).__init__(*args, **kwargs)
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self.local_storage = get_storage_class(
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"compressor.storage.CompressorFileStorage")()
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def save(self, name, content):
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self.local_storage._save(name, content)
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super(CachedS3BotoStorage, self).save(name, self.local_storage._open(name))
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return name
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#. Set your :attr:`~django.conf.settings.COMPRESS_STORAGE` and STATICFILES_STORAGE_
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settings to the dotted path of your custom cached storage backend, e.g.
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``'mysite.storage.CachedS3BotoStorage'``.
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#. To have Django correctly render the URLs to your static files, set the
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STATIC_URL_ setting to the same value as
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:attr:`~django.conf.settings.COMPRESS_URL` (e.g.
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``"http://compressor-test.s3.amazonaws.com/"``).
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.. _CDN: http://en.wikipedia.org/wiki/Content_delivery_network
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.. _Amazon S3: https://s3.amazonaws.com/
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.. _boto: http://boto.cloudhackers.com/
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.. _django-storages: http://github.com/jschneier/django-storages
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.. _staticfiles: http://docs.djangoproject.com/en/dev/howto/static-files/
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.. _STATIC_ROOT: http://docs.djangoproject.com/en/dev/ref/settings/#static-root
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.. _STATIC_URL: http://docs.djangoproject.com/en/dev/ref/settings/#static-url
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.. _STATICFILES_STORAGE: http://docs.djangoproject.com/en/dev/ref/contrib/staticfiles/#staticfiles-storage
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