mirror of
https://github.com/SickGear/SickGear.git
synced 2024-12-22 18:53:38 +00:00
252 lines
7.6 KiB
Python
252 lines
7.6 KiB
Python
|
#!/usr/bin/env python2
|
||
|
#encoding:utf-8
|
||
|
#author:dbr/Ben
|
||
|
#project:tvdb_api
|
||
|
#repository:http://github.com/dbr/tvdb_api
|
||
|
#license:unlicense (http://unlicense.org/)
|
||
|
|
||
|
"""
|
||
|
urllib2 caching handler
|
||
|
Modified from http://code.activestate.com/recipes/491261/
|
||
|
"""
|
||
|
from __future__ import with_statement
|
||
|
|
||
|
__author__ = "dbr/Ben"
|
||
|
__version__ = "1.9"
|
||
|
|
||
|
import os
|
||
|
import time
|
||
|
import errno
|
||
|
from hashlib import md5
|
||
|
from threading import RLock
|
||
|
from six import StringIO
|
||
|
from six.moves import urllib, http_client as httplib
|
||
|
|
||
|
cache_lock = RLock()
|
||
|
|
||
|
def locked_function(origfunc):
|
||
|
"""Decorator to execute function under lock"""
|
||
|
def wrapped(*args, **kwargs):
|
||
|
cache_lock.acquire()
|
||
|
try:
|
||
|
return origfunc(*args, **kwargs)
|
||
|
finally:
|
||
|
cache_lock.release()
|
||
|
return wrapped
|
||
|
|
||
|
def calculate_cache_path(cache_location, url):
|
||
|
"""Checks if [cache_location]/[hash_of_url].headers and .body exist
|
||
|
"""
|
||
|
thumb = md5(url).hexdigest()
|
||
|
header = os.path.join(cache_location, thumb + ".headers")
|
||
|
body = os.path.join(cache_location, thumb + ".body")
|
||
|
return header, body
|
||
|
|
||
|
def check_cache_time(path, max_age):
|
||
|
"""Checks if a file has been created/modified in the [last max_age] seconds.
|
||
|
False means the file is too old (or doesn't exist), True means it is
|
||
|
up-to-date and valid"""
|
||
|
if not os.path.isfile(path):
|
||
|
return False
|
||
|
cache_modified_time = os.stat(path).st_mtime
|
||
|
time_now = time.time()
|
||
|
if cache_modified_time < time_now - max_age:
|
||
|
# Cache is old
|
||
|
return False
|
||
|
else:
|
||
|
return True
|
||
|
|
||
|
@locked_function
|
||
|
def exists_in_cache(cache_location, url, max_age):
|
||
|
"""Returns if header AND body cache file exist (and are up-to-date)"""
|
||
|
hpath, bpath = calculate_cache_path(cache_location, url)
|
||
|
if os.path.exists(hpath) and os.path.exists(bpath):
|
||
|
return(
|
||
|
check_cache_time(hpath, max_age)
|
||
|
and check_cache_time(bpath, max_age)
|
||
|
)
|
||
|
else:
|
||
|
# File does not exist
|
||
|
return False
|
||
|
|
||
|
@locked_function
|
||
|
def store_in_cache(cache_location, url, response):
|
||
|
"""Tries to store response in cache."""
|
||
|
hpath, bpath = calculate_cache_path(cache_location, url)
|
||
|
try:
|
||
|
outf = open(hpath, "wb")
|
||
|
headers = str(response.info())
|
||
|
outf.write(headers)
|
||
|
outf.close()
|
||
|
|
||
|
outf = open(bpath, "wb")
|
||
|
outf.write(response.read())
|
||
|
outf.close()
|
||
|
except IOError:
|
||
|
return True
|
||
|
else:
|
||
|
return False
|
||
|
|
||
|
@locked_function
|
||
|
def delete_from_cache(cache_location, url):
|
||
|
"""Deletes a response in cache."""
|
||
|
hpath, bpath = calculate_cache_path(cache_location, url)
|
||
|
try:
|
||
|
if os.path.exists(hpath):
|
||
|
os.remove(hpath)
|
||
|
if os.path.exists(bpath):
|
||
|
os.remove(bpath)
|
||
|
except IOError:
|
||
|
return True
|
||
|
else:
|
||
|
return False
|
||
|
|
||
|
class CacheHandler(urllib.request.BaseHandler):
|
||
|
"""Stores responses in a persistant on-disk cache.
|
||
|
|
||
|
If a subsequent GET request is made for the same URL, the stored
|
||
|
response is returned, saving time, resources and bandwidth
|
||
|
"""
|
||
|
@locked_function
|
||
|
def __init__(self, cache_location, max_age = 21600):
|
||
|
"""The location of the cache directory"""
|
||
|
self.max_age = max_age
|
||
|
self.cache_location = cache_location
|
||
|
if not os.path.exists(self.cache_location):
|
||
|
try:
|
||
|
os.mkdir(self.cache_location)
|
||
|
except OSError as e:
|
||
|
if e.errno == errno.EEXIST and os.path.isdir(self.cache_location):
|
||
|
# File exists, and it's a directory,
|
||
|
# another process beat us to creating this dir, that's OK.
|
||
|
pass
|
||
|
else:
|
||
|
# Our target dir is already a file, or different error,
|
||
|
# relay the error!
|
||
|
raise
|
||
|
|
||
|
def default_open(self, request):
|
||
|
"""Handles GET requests, if the response is cached it returns it
|
||
|
"""
|
||
|
if "GET" != request.get_method():
|
||
|
return None # let the next handler try to handle the request
|
||
|
|
||
|
if exists_in_cache(
|
||
|
self.cache_location, request.get_full_url(), self.max_age
|
||
|
):
|
||
|
return CachedResponse(
|
||
|
self.cache_location,
|
||
|
request.get_full_url(),
|
||
|
set_cache_header = True
|
||
|
)
|
||
|
else:
|
||
|
return None
|
||
|
|
||
|
def http_response(self, request, response):
|
||
|
"""Gets a HTTP response, if it was a GET request and the status code
|
||
|
starts with 2 (200 OK etc) it caches it and returns a CachedResponse
|
||
|
"""
|
||
|
if ("GET" == request.get_method()
|
||
|
and str(response.code).startswith("2")):
|
||
|
if 'x-local-cache' not in response.info():
|
||
|
# Response is not cached
|
||
|
set_cache_header = store_in_cache(
|
||
|
self.cache_location,
|
||
|
request.get_full_url(),
|
||
|
response
|
||
|
)
|
||
|
else:
|
||
|
set_cache_header = True
|
||
|
|
||
|
return CachedResponse(
|
||
|
self.cache_location,
|
||
|
request.get_full_url(),
|
||
|
set_cache_header = set_cache_header
|
||
|
)
|
||
|
else:
|
||
|
return response
|
||
|
|
||
|
class CachedResponse(StringIO):
|
||
|
"""An urllib2.response-like object for cached responses.
|
||
|
|
||
|
To determine if a response is cached or coming directly from
|
||
|
the network, check the x-local-cache header rather than the object type.
|
||
|
"""
|
||
|
|
||
|
@locked_function
|
||
|
def __init__(self, cache_location, url, set_cache_header=True):
|
||
|
self.cache_location = cache_location
|
||
|
hpath, bpath = calculate_cache_path(cache_location, url)
|
||
|
|
||
|
StringIO.__init__(self, open(bpath, "rb").read())
|
||
|
|
||
|
self.url = url
|
||
|
self.code = 200
|
||
|
self.msg = "OK"
|
||
|
headerbuf = open(hpath, "rb").read()
|
||
|
if set_cache_header:
|
||
|
headerbuf += "x-local-cache: %s\r\n" % (bpath)
|
||
|
self.headers = httplib.HTTPMessage(StringIO(headerbuf))
|
||
|
|
||
|
def info(self):
|
||
|
"""Returns headers
|
||
|
"""
|
||
|
return self.headers
|
||
|
|
||
|
def geturl(self):
|
||
|
"""Returns original URL
|
||
|
"""
|
||
|
return self.url
|
||
|
|
||
|
@locked_function
|
||
|
def recache(self):
|
||
|
new_request = urllib.request.urlopen(self.url)
|
||
|
set_cache_header = store_in_cache(
|
||
|
self.cache_location,
|
||
|
new_request.url,
|
||
|
new_request
|
||
|
)
|
||
|
CachedResponse.__init__(self, self.cache_location, self.url, True)
|
||
|
|
||
|
@locked_function
|
||
|
def delete_cache(self):
|
||
|
delete_from_cache(
|
||
|
self.cache_location,
|
||
|
self.url
|
||
|
)
|
||
|
|
||
|
|
||
|
if __name__ == "__main__":
|
||
|
def main():
|
||
|
"""Quick test/example of CacheHandler"""
|
||
|
opener = urllib.request.build_opener(CacheHandler("/tmp/"))
|
||
|
response = opener.open('http://google.com')
|
||
|
print(response.headers)
|
||
|
print('Response:', response.read())
|
||
|
|
||
|
response.recache()
|
||
|
print(response.headers)
|
||
|
print('After recache:', response.read())
|
||
|
|
||
|
# Test usage in threads
|
||
|
from threading import Thread
|
||
|
|
||
|
class CacheThreadTest(Thread):
|
||
|
lastdata = None
|
||
|
|
||
|
def run(self):
|
||
|
req = opener.open("http://google.com")
|
||
|
newdata = req.read()
|
||
|
if None is self.lastdata:
|
||
|
self.lastdata = newdata
|
||
|
assert self.lastdata == newdata, "Data was not consistent, uhoh"
|
||
|
req.recache()
|
||
|
threads = [CacheThreadTest() for _ in range(50)]
|
||
|
print('Starting threads')
|
||
|
[t.start() for t in threads]
|
||
|
print('..done')
|
||
|
print('Joining threads')
|
||
|
[t.join() for t in threads]
|
||
|
print('..done')
|
||
|
main()
|