67 lines
2.5 KiB
Python
67 lines
2.5 KiB
Python
from brotli import compress
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from flask import request, make_response
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from functools import wraps
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from threading import Thread
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from hashlib import sha256
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import redis
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import os.path
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import mimetypes
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class BrotliCache(object):
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def __init__(self, redis_kwargs={}, max_wait=0.3, expire=60*60*12):
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self.redis = redis.StrictRedis(**redis_kwargs)
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self.max_wait = max_wait
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self.expire = expire
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def compress(self, cache_key, lock_key, body):
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encbody = compress(body)
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self.redis.set(cache_key, encbody, ex=self.expire)
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self.redis.delete(lock_key)
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def wrap_response(self, response):
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if 'br' not in request.accept_encodings or response.is_streamed:
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return response
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body = response.get_data()
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digest = sha256(body).hexdigest()
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cache_key = 'brotlicache:{}'.format(digest)
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encbody = self.redis.get(cache_key)
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if not encbody:
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lock_key = 'brotlicache:lock:{}'.format(digest)
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if self.redis.set(lock_key, 1, nx=True, ex=10):
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t = Thread(target=self.compress, args=(cache_key, lock_key, body))
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t.start()
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if self.max_wait > 0:
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t.join(self.max_wait)
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encbody = self.redis.get(cache_key)
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if encbody:
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response.headers.set('content-encoding', 'br')
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response.headers.set('vary', 'accept-encoding')
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response.set_data(encbody)
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return response
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return response
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def brotli(app, static = True, dynamic = True):
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original_static = app.view_functions['static']
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def static_maybe_gzip_brotli(filename=None):
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path = os.path.join(app.static_folder, filename)
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for encoding, extension in (('br', '.br'), ('gzip', '.gz')):
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if encoding not in request.accept_encodings:
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continue
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encpath = path + extension
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if os.path.isfile(encpath):
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resp = make_response(original_static(filename=filename + extension))
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resp.headers.set('content-encoding', encoding)
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resp.headers.set('vary', 'accept-encoding')
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mimetype = mimetypes.guess_type(filename)[0] or 'application/octet-stream'
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resp.headers.set('content-type', mimetype)
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return resp
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return original_static(filename=filename)
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if static:
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app.view_functions['static'] = static_maybe_gzip_brotli
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if dynamic:
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cache = BrotliCache()
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app.after_request(cache.wrap_response)
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