Added a storage which compress only modified packages and invalidates caching automatically #657
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…ss and appends a hash to the resources' URL in order to invalidate caching mechanisms automatically.
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This pull request, beyond fix unit test errors, adds four templatetags for prefetching resources and a new storage which I called OptimizedPipelineStorage. This storage adds three new features:
It identifies which packages had removed/added/changed files and will compress only those which have modifications. When you have multiple packages, this will speed up the collectstatic process substantially.
After the compression, this storage produces a single md5 hash from the compressed files. This hash is appended to the resources' URL as a query parameter. Thus, when any package has modifications the compression will produce a new hash and, consequently, the cache's registries for your static files will be automatically invalidated.
It removes from the STATIC_ROOT the source files that were used to produce the compressed files. This is useful when you don't want to expose the raw versions of your javascript and css files.
I found this storage and the new templatetags very valuable for my necessities. I hope it serves to someone else too. Comments are welcome.