mirror of
https://github.com/JimmXinu/FanFicFare.git
synced 2025-12-06 08:52:55 +01:00
140 lines
4.9 KiB
Python
140 lines
4.9 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2022 FanFicFare team
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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#
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from __future__ import absolute_import
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import sys
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import threading
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import logging
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logger = logging.getLogger(__name__)
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from ..six import text_type as unicode
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from ..six import ensure_text
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from .base_fetcher import FetcherResponse
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from .decorators import FetcherDecorator
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from .log import make_log
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import pickle
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if sys.version_info < (2, 7):
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sys.exit('This program requires Python 2.7 or newer.')
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elif sys.version_info < (3, 0):
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reload(sys) # Reload restores 'hidden' setdefaultencoding method
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sys.setdefaultencoding("utf-8")
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def pickle_load(f):
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return pickle.load(f)
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else: # > 3.0
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def pickle_load(f):
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return pickle.load(f,encoding="bytes")
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class BasicCache(object):
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def __init__(self):
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self.cache_lock = threading.RLock()
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self.basic_cache = {}
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self.filename = None
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self.autosave = False
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if self.filename:
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try:
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self.load_cache()
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except:
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raise
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logger.debug("Failed to load cache(%s), going on without."%filename)
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## used by CLI --save-cache dev debugging feature
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def set_autosave(self,autosave=False,filename=None):
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self.autosave = autosave
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self.filename = filename
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def load_cache(self,filename=None):
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# logger.debug("load cache(%s)"%(filename or self.filename))
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with self.cache_lock, open(filename or self.filename,'rb') as jin:
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self.basic_cache = pickle_load(jin)
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# logger.debug(self.basic_cache.keys())
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def save_cache(self,filename=None):
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with self.cache_lock, open(filename or self.filename,'wb') as jout:
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pickle.dump(self.basic_cache,jout,protocol=2)
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# logger.debug("save cache(%s)"%(filename or self.filename))
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def make_cachekey(self, url, parameters=None):
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with self.cache_lock:
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keylist=[url]
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if parameters != None:
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keylist.append('&'.join('{0}={1}'.format(key, val) for key, val in sorted(parameters.items())))
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return unicode('?'.join(keylist))
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def has_cachekey(self,cachekey):
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with self.cache_lock:
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return cachekey in self.basic_cache
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def get_from_cache(self,cachekey):
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with self.cache_lock:
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return self.basic_cache.get(cachekey,None)
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def set_to_cache(self,cachekey,data,redirectedurl):
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with self.cache_lock:
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self.basic_cache[cachekey] = (data,ensure_text(redirectedurl))
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# logger.debug("set_to_cache %s->%s"%(cachekey,ensure_text(redirectedurl)))
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if self.autosave and self.filename:
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self.save_cache()
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class BasicCacheDecorator(FetcherDecorator):
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def __init__(self,cache):
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super(BasicCacheDecorator,self).__init__()
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self.cache = cache
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def fetcher_do_request(self,
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fetcher,
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chainfn,
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method,
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url,
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parameters=None,
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referer=None,
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usecache=True,
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image=False):
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'''
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When should cache be cleared or not used? logins, primarily
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Note that usecache=False prevents lookup, but cache still saves
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result
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'''
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# logger.debug("BasicCacheDecorator fetcher_do_request")
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cachekey=self.cache.make_cachekey(url, parameters)
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hit = usecache and self.cache.has_cachekey(cachekey) and not cachekey.startswith('file:')
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logger.debug(make_log('BasicCache',method,url,hit=hit))
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if hit:
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data,redirecturl = self.cache.get_from_cache(cachekey)
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# logger.debug("from_cache %s->%s"%(cachekey,redirecturl))
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return FetcherResponse(data,redirecturl=redirecturl,fromcache=True)
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fetchresp = chainfn(
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method,
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url,
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parameters=parameters,
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referer=referer,
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usecache=usecache,
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image=image)
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data = fetchresp.content
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## don't re-cache, which includes file://, marked fromcache
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## down in RequestsFetcher. I can foresee using the dev CLI
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## saved-cache and wondering why file changes aren't showing
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## up.
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if not fetchresp.fromcache:
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self.cache.set_to_cache(cachekey,data,fetchresp.redirecturl)
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return fetchresp
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