def fetch_tuple(path, querystring, server):
""" Fetches the requested object as (status, headers, body, status num)"""
response = ProxyRequestHandler.fetchurl('GET', path, querystring, server)
statusline = str(response.status) + " " + response.reason
headers = response.getheaders()
body = response.read()
response.close()
return (statusline, headers, body, response.status)
def fetch_tuple(path, querystring, server):
""" Fetches the requested object as (status, headers, body, status num)"""
response = ProxyRequestHandler.fetchurl('GET', path, querystring, server)
statusline = str(response.status) + " " + response.reason
headers = response.getheaders()
body = response.read()
response.close()
return (statusline, headers, body, response.status)
def handle_request(self, query, path, querystring, app, server):
""" handle a cacheable request. returns (status, headers, data) tuple.
If it is found in the cache, just return the result directly from the
cache. Otherwise make a request to the graph api server and return the
result. If it is a 200 OK response, it gets saved in the cache, also.
"""
accesstoken_parts = None
accesstoken = None
if 'access_token' in query:
accesstoken = query['access_token'][0]
accesstoken_parts = ProxyRequestHandler.parse_access_token(
query['access_token'][0])
del query['access_token']
appid = accesstoken_parts[0] if accesstoken_parts else '0'
uid = accesstoken_parts[2] if accesstoken_parts else '0'
usetable = '/' not in path # use table for user directly
# usetable = False
fields = None
if 'fields' in query and usetable:
fields = query['fields'][0]
del query['fields']
key = path + "__" + appid
subkey = uid + "__" + urllib.urlencode(query)
value = None
hashdict = None
logging.debug('cache handling request with key ' + key +
', and subkey ' + subkey + ' for user ' + uid)
self.lock.acquire()
if key in self.cache:
# step 1. acquire the dictionary
hashdict = self.cache[key]
if subkey in hashdict: # step 2: grab the relevant data if there
value = hashdict[subkey]
else:
hashdict = HashedDictionary()
self.cache[key] = hashdict
self.lock.release()
if value: # step 3: return the data if available
if usetable:
(statusline, headers, table) = value
return (statusline, headers, get_response(table, fields))
else:
return value
# at this point, we have a cache miss
# step 4: fetch data
if usetable:
(statusline, headers, table, status) = _fetchtable(query,
path, accesstoken, app, hashdict, subkey, server)
# step 4.5: form a response body from the table
if status != 200:
# fetchtable returns body instead of table on error
body = table
else:
for header in headers:
if header[0].upper() == 'CONTENT-LENGTH':
headers.remove(header)
break
body = get_response(table, fields)
else:
(statusline, headers, body, status) = fetch_tuple(path,
querystring, server)
if status == 200:
hashdict[subkey] = ((statusline, headers, body), body)
return (statusline, headers, body)
def __call__(self, environ, start_response):
return ProxyRequestHandler(environ, start_response, self.validator,
self.cache, self.apps, self.server)
def handle_request(self, query, path, querystring, app, server):
""" handle a cacheable request. returns (status, headers, data) tuple.
If it is found in the cache, just return the result directly from the
cache. Otherwise make a request to the graph api server and return the
result. If it is a 200 OK response, it gets saved in the cache, also.
"""
accesstoken_parts = None
accesstoken = None
if 'access_token' in query:
accesstoken = query['access_token'][0]
accesstoken_parts = ProxyRequestHandler.parse_access_token(
query['access_token'][0])
del query['access_token']
appid = accesstoken_parts[0] if accesstoken_parts else '0'
uid = accesstoken_parts[2] if accesstoken_parts else '0'
usetable = '/' not in path # use table for user directly
# usetable = False
fields = None
if 'fields' in query and usetable:
fields = query['fields'][0]
del query['fields']
key = path + "__" + appid
subkey = uid + "__" + urllib.urlencode(query)
value = None
hashdict = None
logging.debug('cache handling request with key ' + key +
', and subkey ' + subkey + ' for user ' + uid)
self.lock.acquire()
if key in self.cache:
# step 1. acquire the dictionary
hashdict = self.cache[key]
if subkey in hashdict: # step 2: grab the relevant data if there
value = hashdict[subkey]
else:
hashdict = HashedDictionary()
self.cache[key] = hashdict
self.lock.release()
if value: # step 3: return the data if available
if usetable:
(statusline, headers, table) = value
return (statusline, headers, get_response(table, fields))
else:
return value
# at this point, we have a cache miss
# step 4: fetch data
if usetable:
(statusline, headers, table,
status) = _fetchtable(query, path, accesstoken, app, hashdict,
subkey, server)
# step 4.5: form a response body from the table
if status != 200:
# fetchtable returns body instead of table on error
body = table
else:
for header in headers:
if header[0].upper() == 'CONTENT-LENGTH':
headers.remove(header)
break
body = get_response(table, fields)
else:
(statusline, headers, body,
status) = fetch_tuple(path, querystring, server)
if status == 200:
hashdict[subkey] = ((statusline, headers, body), body)
return (statusline, headers, body)