96 lines
2.8 KiB
Python
96 lines
2.8 KiB
Python
import socket
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import zlib
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from pymemcache.client.base import Client, PooledClient
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from clandestined import RendezvousHash as RH
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class RendezvousHash(RH):
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def get_node(self, key):
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return self.find_node(key)
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class HashClient(object):
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"""
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A client for communicating with a cluster of memcached servers
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"""
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def __init__(
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self,
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servers,
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hasher=None,
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serializer=None,
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connect_timeout=None,
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timeout=None,
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no_delay=False,
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ignore_exc=False,
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socket_module=socket,
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key_prefix=b'',
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max_pool_size=None,
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lock_generator=None,
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use_pooling=False,
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):
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"""
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Args:
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servers: list(tuple(hostname, port))
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serializer: optional class with ``serialize`` and ``deserialize``
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functions.
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hasher: optional class three functions ``get_node``, ``add_node``, and
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``remove_node``
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defaults to crc32 hash.
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use_pooling: use py:class:`.PooledClient` as the default underlying
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class. ``max_pool_size`` and ``lock_generator`` can
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be used with this. default: False
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Further arguments are interpreted as for :py:class:`.Client`
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constructor.
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"""
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self.clients = {}
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if hasher is None:
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self.hasher = RendezvousHash()
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for server, port in servers:
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key = '%s:%s' % (server, port)
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kwargs = {
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'connect_timeout': connect_timeout,
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'timeout': timeout,
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'no_delay': no_delay,
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'ignore_exc': ignore_exc,
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'socket_module': socket_module,
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'key_prefix': key_prefix,
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}
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if serializer is not None:
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kwargs['serializer'] = serializer.serialize
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kwargs['deserializer'] = serializer.deserialize
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if use_pooling is True:
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kwargs.update({
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'max_pool_size': max_pool_size,
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'lock_generator': lock_generator
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})
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client = PooledClient(
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(server, port),
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**kwargs
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)
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else:
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client = Client((server, port))
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self.clients[key] = client
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self.hasher.add_node(key)
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def _get_client(self, key):
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server = self.hasher.get_node(key)
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print('got server %s' % server)
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client = self.clients[server]
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return client
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def set(self, key, *args, **kwargs):
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client = self._get_client(key)
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return client.set(key, *args, **kwargs)
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def get(self, key, *args, **kwargs):
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client = self._get_client(key)
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return client.get(key, *args, **kwargs)
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