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160 lines (131 loc) · 5.1 KB
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# Copyright 2011-2012 GRNET S.A. All rights reserved.
#
# Redistribution and use in source and binary forms, with or
# without modification, are permitted provided that the following
# conditions are met:
#
# 1. Redistributions of source code must retain the above
# copyright notice, this list of conditions and the following
# disclaimer.
#
# 2. Redistributions in binary form must reproduce the above
# copyright notice, this list of conditions and the following
# disclaimer in the documentation and/or other materials
# provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS
# OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GRNET S.A OR
# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
# USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
#
# The views and conclusions contained in the software and
# documentation are those of the authors and should not be
# interpreted as representing official policies, either expressed
# or implied, of GRNET S.A.
from . import ObjectPool, PooledObject
from select import select
from httplib import (
HTTPConnection as http_class,
HTTPSConnection as https_class,
ResponseNotReady,
)
from threading import Lock
import logging
log = logging.getLogger(__name__)
_pools = {}
_pools_mutex = Lock()
default_pool_size = 100
USAGE_LIMIT = 1000
def init_http_pooling(size):
"""Initializes default pool size and clears the pool registry.
Call before any other calls in the http pool library.
When forking call again for each new process.
"""
global default_pool_size
default_pool_size = size
_pools.clear()
class HTTPConnectionPool(ObjectPool):
_scheme_to_class = {
'http': http_class,
'https': https_class,
}
def __init__(self, scheme, netloc, size=None):
log.debug("INIT-POOL: Initializing pool of size %d, scheme: %s, "
"netloc: %s", size, scheme, netloc)
ObjectPool.__init__(self, size=size)
connection_class = self._scheme_to_class.get(scheme, None)
if connection_class is None:
m = 'Unsupported scheme: %s' % (scheme,)
raise ValueError(m)
self.connection_class = connection_class
self.scheme = scheme
self.netloc = netloc
def _pool_create(self):
log.debug("CREATE-HTTP-BEFORE from pool %r", self)
conn = self.connection_class(self.netloc)
conn._pool_use_counter = USAGE_LIMIT
return conn
def _pool_verify(self, conn):
log.debug("VERIFY-HTTP")
if conn is None:
return False
sock = conn.sock
if sock is None:
return True
if select((conn.sock,), (), (), 0)[0]:
return False
return True
def _pool_cleanup(self, conn):
log.debug("CLEANUP-HTTP")
# every connection can be used a finite number of times
conn._pool_use_counter -= 1
# see httplib source for connection states documentation
conn_state = conn._HTTPConnection__state
if (conn._pool_use_counter > 0 and conn_state == "Idle"):
try:
conn.getresponse()
except ResponseNotReady:
log.debug("CLEANUP-HTTP: Not closing connection. Will reuse.")
return False
log.debug("CLEANUP-HTTP: Closing connection. Will not reuse.")
conn.close()
return True
class PooledHTTPConnection(PooledObject):
_pool_log_prefix = "HTTP"
_pool_class = HTTPConnectionPool
_pool_key = __name__
def __init__(self, netloc, scheme='http', pool=None, pool_key=None, **kw):
kw['netloc'] = netloc
kw['scheme'] = scheme
kw['pool'] = pool
if pool_key is not None:
kw['pool_key'] = pool_key
super(PooledHTTPConnection, self).__init__(**kw)
def get_pool(self):
kwargs = self._pool_kwargs
pool = kwargs.pop('pool', None)
if pool is not None:
return pool
# pool was not given, find one from the global registry
scheme = kwargs['scheme']
netloc = kwargs['netloc']
size = kwargs.get('size', default_pool_size)
pool_key = kwargs.get('pool_key', self._pool_key)
# ensure distinct pools for every (scheme, netloc) combination
key = (pool_key, scheme, netloc)
with _pools_mutex:
if key not in _pools:
log.debug("HTTP-GET: Creating pool for key %s", key)
pool = HTTPConnectionPool(scheme, netloc, size=size)
_pools[key] = pool
else:
pool = _pools[key]
return pool