5fd68b34c7
Add support for bool values, use ssize_t in some places (not sure about this) and some other stuff.
112 lines
4.1 KiB
Python
112 lines
4.1 KiB
Python
"""`python-memcached`-compatible wrapper around `_pylibmc`.
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The interface is pretty much exactly the same as python-memcached, with some
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minor differences. If you should happen to spot any, file a bug!
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>>> mc = Client(["127.0.0.1"])
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>>> b = mc.behaviors
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>>> b.keys()
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['hash', 'connect timeout', 'cache lookups', 'buffer requests', 'verify key', 'support cas', 'poll timeout', 'no block', 'tcp nodelay', 'distribution', 'sort hosts']
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>>> b["hash"]
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'default'
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>>> b["hash"] = 'fnv1a_32'
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>>> mc.behaviors["hash"]
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'fnv1a_32'
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"""
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import _pylibmc
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__all__ = ["hashers", "distributions", "Client"]
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hashers = {}
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distributions = {}
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# Not the prettiest way of doing things, but works well.
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for name in dir(_pylibmc):
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if name.startswith("hash_"):
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hashers[name[5:]] = getattr(_pylibmc, name)
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elif name.startswith("distribution_"):
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distributions[name[13:].replace("_", " ")] = getattr(_pylibmc, name)
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hashers_rvs = dict((v, k) for (k, v) in hashers.iteritems())
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distributions_rvs = dict((v, k) for (k, v) in distributions.iteritems())
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class BehaviorDict(dict):
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def __init__(self, client, *args, **kwds):
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super(BehaviorDict, self).__init__(*args, **kwds)
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self.client = client
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def __setitem__(self, name, value):
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super(BehaviorDict, self).__setitem__(name, value)
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self.client.behaviors = self
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def update(self, *args, **kwds):
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super(BehaviorDict, self).update(*args, **kwds)
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self.client.behaviors = self
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class Client(_pylibmc.client):
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def __init__(self, servers, *args, **kwds):
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"""Initialize a memcached client instance.
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This connects to the servers in *servers*, which will default to being
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TCP servers. If it looks like a filesystem path, a UNIX socket. If
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prefixed with `udp:`, a UDP connection.
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"""
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addr_tups = []
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for server in servers:
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addr = server
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port = 11211
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if server.startswith("udp:"):
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stype = _pylibmc.server_type_udp
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addr = addr[4:]
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if ":" in server:
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(addr, port) = addr.split(":", 1)
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port = int(port)
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elif ":" in server:
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stype = _pylibmc.server_type_tcp
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(addr, port) = server.split(":", 1)
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port = int(port)
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elif "/" in server:
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stype = _pylibmc.server_type_unix
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port = 0
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else:
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stype = _pylibmc.server_type_tcp
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addr_tups.append((stype, addr, port))
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super(Client, self).__init__(addr_tups)
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# Perfomance is generally a lot better with tcp_nodelay
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# so set that as the default
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self.behaviors["tcp_nodelay"] = True
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def get_behaviors(self):
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"""Gets the behaviors from the underlying C client instance.
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Reverses the integer constants for `hash` and `distribution` into more
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understandable string values. See *set_behaviors* for info.
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"""
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behaviors = super(Client, self).get_behaviors()
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behaviors["hash"] = hashers_rvs[behaviors["hash"]]
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behaviors["distribution"] = distributions_rvs[behaviors["distribution"]]
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return BehaviorDict(self, behaviors)
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def set_behaviors(self, behaviors):
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"""Sets the behaviors on the underlying C client instance.
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Takes care of morphing the `hash` key, if specified, into the
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corresponding integer constant (which the C client expects.) If,
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however, an unknown value is specified, it's passed on to the C client
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(where it most surely will error out.)
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This also happens for `distribution`.
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"""
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behaviors = behaviors.copy()
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if behaviors.get("hash", None) in hashers:
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behaviors["hash"] = hashers[behaviors["hash"]]
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if behaviors.get("distribution") in distributions:
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behaviors["distribution"] = distributions[behaviors["distribution"]]
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return super(Client, self).set_behaviors(behaviors)
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behaviors = property(get_behaviors, set_behaviors)
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if __name__ == "__main__":
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import doctest
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doctest.testmod()
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