fcb51c09d3
Provides a module `assetcache` to support automatic cachebusting of
static web assets, rather than the current approach of incrementing
a version number.
On module load, it walks the file/assets/ dir, computes a CRC32 of
each asset, and provides those hashes via `assetcache_get(path)` at
runtime. The primary consumer of hashes at present is the new `asset`
filter for Jinja2, which accepts a relative asset path and returns the
full path, with cache busting, suitable for final use in the template.
Ex: `{{ 'css/main.css' | asset }}`
20 lines
504 B
Python
20 lines
504 B
Python
import os
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import zlib
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from collections import defaultdict
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ASSET_DIR = 'files/assets'
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ASSET_CACHE = defaultdict(lambda: None)
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def assetcache_build(asset_dir):
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for root, dirs, files in os.walk(asset_dir):
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for fname in files:
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fpath = root + '/' + fname
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relpath = fpath[len(asset_dir) + 1:].replace('\\', '/')
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with open(fpath, 'rb') as f:
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fhash = zlib.crc32(f.read())
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ASSET_CACHE[relpath] = '%x' % fhash
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def assetcache_get(path):
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return ASSET_CACHE[path]
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assetcache_build(ASSET_DIR)
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