Turn pylibmc into a shallow package
lericson
parent
a3605ca55f
commit
9d4b01ff4d
307
pylibmc.py
307
pylibmc.py
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"""Snappy libmemcached wrapper
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pylibmc is a Python wrapper around TangentOrg's libmemcached library.
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The interface is intentionally made as close to python-memcached as possible,
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so that applications can drop-in replace it.
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Example usage
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=============
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Create a connection and configure it::
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>>> import pylibmc
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>>> mc = pylibmc.Client(["127.0.0.1"], binary=True)
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>>> mc.behaviors = {"tcp_nodelay": True, "ketama": True}
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Basic operation::
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>>> mc.set("some_key", "Some value")
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True
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>>> value = mc.get("some_key")
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>>> value
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'Some value'
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>>> mc.set("another_key", 3)
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True
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>>> mc.delete("another_key")
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True
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>>> mc.set("key", "1") # str or int is fine
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True
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Atomic increments and decrements::
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>>> mc.incr("key")
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2L
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>>> mc.decr("key")
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1L
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Batch operation::
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>>> mc.get_multi(["key", "another_key"])
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{'key': '1'}
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>>> mc.set_multi({"cats": ["on acid", "furry"], "dogs": True})
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[]
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>>> mc.get_multi(["cats", "dogs"])
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{'cats': ['on acid', 'furry'], 'dogs': True}
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>>> mc.delete_multi(["cats", "dogs", "nonextant"])
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False
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>>> mc.add_multi({"cats": ["on acid", "furry"], "dogs": True})
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[]
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>>> mc.get_multi(["cats", "dogs"])
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{'cats': ['on acid', 'furry'], 'dogs': True}
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>>> mc.add_multi({"cats": "not set", "dogs": "definitely not set", "bacon": "yummy"})
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['cats', 'dogs']
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>>> mc.get_multi(["cats", "dogs", "bacon"])
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{'cats': ['on acid', 'furry'], 'bacon': 'yummy', 'dogs': True}
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>>> mc.delete_multi(["cats", "dogs", "bacon"])
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True
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Further Reading
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===============
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See http://sendapatch.se/projects/pylibmc/
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"""
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from __future__ import with_statement
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import _pylibmc
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from Queue import Queue
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__all__ = ["hashers", "distributions", "Client"]
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__version__ = _pylibmc.__version__
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support_compression = _pylibmc.support_compression
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errors = tuple(e for (n, e) in _pylibmc.exceptions)
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# *Cough* Uhm, not the prettiest of things but this unpacks all exception
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# objects and sets them on the very module object currently constructed.
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import sys
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modself = sys.modules[__name__]
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for name, exc in _pylibmc.exceptions:
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setattr(modself, name, exc)
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hashers, hashers_rvs = {}, {}
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distributions, distributions_rvs = {}, {}
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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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key, value = name[5:], getattr(_pylibmc, name)
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hashers[key] = value
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hashers_rvs[value] = key
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elif name.startswith("distribution_"):
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key, value = name[13:].replace("_", " "), getattr(_pylibmc, name)
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distributions[key] = value
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distributions_rvs[value] = key
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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.set_behaviors({name: value})
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def update(self, d):
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super(BehaviorDict, self).update(d)
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self.client.set_behaviors(d.copy())
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class Client(_pylibmc.client):
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def __init__(self, servers, binary=False):
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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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If *binary* is True, the binary memcached protocol is used.
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"""
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self.binary = binary
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self.addresses = list(servers)
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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__(servers=addr_tups, binary=binary)
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def __repr__(self):
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return "%s(%r, binary=%r)" % (self.__class__.__name__,
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self.addresses, self.binary)
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def __str__(self):
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addrs = ", ".join(map(str, self.addresses))
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return "<%s for %s, binary=%r>" % (self.__class__.__name__,
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addrs, self.binary)
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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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bvrs = super(Client, self).get_behaviors()
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bvrs["hash"] = hashers_rvs[bvrs["hash"]]
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bvrs["distribution"] = distributions_rvs[bvrs["distribution"]]
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return BehaviorDict(self, bvrs)
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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") is not None:
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behaviors["hash"] = hashers[behaviors["hash"]]
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if behaviors.get("ketama_hash") is not None:
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behaviors["ketama_hash"] = hashers[behaviors["ketama_hash"]]
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if behaviors.get("distribution") is not None:
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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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@property
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def behaviours(self):
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raise AttributeError("nobody uses british spellings")
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def clone(self):
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obj = super(Client, self).clone()
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obj.addresses = list(self.addresses)
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obj.binary = self.binary
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return obj
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from contextlib import contextmanager
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class ClientPool(Queue):
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"""Client pooling helper.
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This is mostly useful in threaded environments, because a client isn't
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thread-safe at all. Instead, what you want to do is have each thread use
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its own client, but you don't want to reconnect these all the time.
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The solution is a pool, and this class is a helper for that.
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>>> mc = Client(["127.0.0.1"])
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>>> pool = ClientPool()
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>>> pool.fill(mc, 4)
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>>> with pool.reserve() as mc:
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... mc.set("hi", "ho")
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... mc.delete("hi")
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...
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True
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True
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"""
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def __init__(self, mc=None, n_slots=None):
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Queue.__init__(self, n_slots)
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if mc is not None:
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self.fill(mc, n_slots)
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@contextmanager
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def reserve(self, timeout=None):
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"""Context manager for reserving a client from the pool.
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If *timeout* is given, it specifiecs how long to wait for a client to
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become available.
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"""
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mc = self.get(True, timeout=timeout)
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try:
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yield mc
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finally:
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self.put(mc)
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def fill(self, mc, n_slots):
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"""Fill *n_slots* of the pool with clones of *mc*."""
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for i in xrange(n_slots):
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self.put(mc.clone())
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class ThreadMappedPool(dict):
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"""Much like the *ClientPool*, helps you with pooling.
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In a threaded environment, you'd most likely want to have a client per
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thread. And there'd be no harm in one thread keeping the same client at all
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times. So, why not map threads to clients? That's what this class does.
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If a client is reserved, this class checks for a key based on the current
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thread, and if none exists, clones the master client and inserts that key.
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>>> mc = Client(["127.0.0.1"])
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>>> pool = ThreadMappedPool(mc)
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>>> with pool.reserve() as mc:
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... mc.set("hi", "ho")
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... mc.delete("hi")
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...
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True
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True
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"""
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def __new__(cls, master):
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return super(ThreadMappedPool, cls).__new__(cls)
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def __init__(self, master):
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self.master = master
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@contextmanager
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def reserve(self):
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"""Reserve a client.
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Creates a new client based on the master client if none exists for the
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current thread.
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"""
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key = thread.get_ident()
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mc = self.pop(key, None)
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if mc is None:
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mc = self.master.clone()
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try:
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yield mc
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finally:
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self[key] = mc
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# This makes sure ThreadMappedPool doesn't exist with non-thread Pythons.
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try:
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import thread
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except ImportError:
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del ThreadMappedPool
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if __name__ == "__main__":
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import sys
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import code
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svr_addrs = []
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sys.stderr.write("pylibmc interactive shell\n\n")
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sys.stderr.write("Input list of servers, end by a blank line\n")
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binary = False
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if sys.argv[1:] == ["--binary"]:
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binary = True
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while True:
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in_addr = raw_input("Address: ")
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if not in_addr:
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break
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if not svr_addrs:
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svr_addrs.append("127.0.0.1")
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mc = Client(svr_addrs, binary=binary)
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code.interact(banner="\nmc client available as `mc`", local={"mc": mc})
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"""Snappy libmemcached wrapper
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pylibmc is a Python wrapper around TangentOrg's libmemcached library.
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The interface is intentionally made as close to python-memcached as possible,
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so that applications can drop-in replace it.
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Example usage
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=============
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Create a connection and configure it::
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>>> import pylibmc
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>>> mc = pylibmc.Client(["127.0.0.1"], binary=True)
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>>> mc.behaviors = {"tcp_nodelay": True, "ketama": True}
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Basic operation::
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>>> mc.set("some_key", "Some value")
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True
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>>> value = mc.get("some_key")
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>>> value
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'Some value'
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>>> mc.set("another_key", 3)
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True
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>>> mc.delete("another_key")
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True
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>>> mc.set("key", "1") # str or int is fine
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True
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Atomic increments and decrements::
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>>> mc.incr("key")
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2L
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>>> mc.decr("key")
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1L
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Batch operation::
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>>> mc.get_multi(["key", "another_key"])
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{'key': '1'}
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>>> mc.set_multi({"cats": ["on acid", "furry"], "dogs": True})
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[]
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>>> mc.get_multi(["cats", "dogs"])
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{'cats': ['on acid', 'furry'], 'dogs': True}
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>>> mc.delete_multi(["cats", "dogs", "nonextant"])
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False
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>>> mc.add_multi({"cats": ["on acid", "furry"], "dogs": True})
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[]
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>>> mc.get_multi(["cats", "dogs"])
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{'cats': ['on acid', 'furry'], 'dogs': True}
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>>> mc.add_multi({"cats": "not set", "dogs": "definitely not set", "bacon": "yummy"})
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['cats', 'dogs']
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>>> mc.get_multi(["cats", "dogs", "bacon"])
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{'cats': ['on acid', 'furry'], 'bacon': 'yummy', 'dogs': True}
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>>> mc.delete_multi(["cats", "dogs", "bacon"])
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True
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Further Reading
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===============
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See http://sendapatch.se/projects/pylibmc/
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"""
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import _pylibmc
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from .consts import hashers, distributions
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from .client import Client
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from .pools import ClientPool, ThreadMappedPool
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support_compression = _pylibmc.support_compression
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__version__ = _pylibmc.__version__
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__all__ = ["hashers", "distributions", "Client",
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"ClientPool", "ThreadMappedPool"]
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"""Interactive shell"""
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import sys
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import code
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import random
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import pylibmc
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tips = [
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"Want to use 127.0.0.1? Just hit Enter immediately.",
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"This was supposed to be a list of tips but I...",
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"I don't really know what to write here.",
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"Really, hit Enter immediately and you'll connect to 127.0.0.1.",
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"Did you know there's a --binary flag? Try it!",
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"Want to use binary mode? Pass --binary as a sole argument."
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]
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def print_header(outf=sys.stdout):
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outf.write("pylibmc interactive shell\n\n")
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outf.write("Input list of servers, terminating by a blank line.\n")
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outf.write(random.choice(tips) + "\n")
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def collect_servers():
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in_addr = raw_input("Address [127.0.0.1]: ")
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while in_addr:
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in_addr = raw_input("Address [<stop>]: ")
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if in_addr:
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yield in_addr
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else:
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yield "127.0.0.1"
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banner = ("\nmc client available as `mc`\n"
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"memface available as mf")
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def interact(servers, banner=banner, binary=False):
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mc = pylibmc.Client(servers, binary=binary)
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mf = pylibmc.Memface(servers, binary=binary)
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local = {"pylibmc": pylibmc,
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"mf": mf, "mc": mc}
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code.interact(banner=banner, local=local)
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def main():
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binary = False
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if sys.argv[1:] == ["--binary"]:
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binary = True
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print_header()
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interact(list(collect_servers()), binary=binary)
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if __name__ == "__main__":
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main()
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"""Python-level wrapper client"""
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import _pylibmc
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from .consts import (hashers, distributions,
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hashers_rvs, distributions_rvs,
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BehaviorDict)
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class Client(_pylibmc.client):
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def __init__(self, servers, binary=False):
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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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If *binary* is True, the binary memcached protocol is used.
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"""
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self.binary = binary
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self.addresses = list(servers)
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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__(servers=addr_tups, binary=binary)
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def __repr__(self):
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return "%s(%r, binary=%r)" % (self.__class__.__name__,
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self.addresses, self.binary)
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def __str__(self):
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addrs = ", ".join(map(str, self.addresses))
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return "<%s for %s, binary=%r>" % (self.__class__.__name__,
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addrs, self.binary)
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def get_behaviors(self):
|
||||
"""Gets the behaviors from the underlying C client instance.
|
||||
|
||||
Reverses the integer constants for `hash` and `distribution` into more
|
||||
understandable string values. See *set_behaviors* for info.
|
||||
"""
|
||||
bvrs = super(Client, self).get_behaviors()
|
||||
bvrs["hash"] = hashers_rvs[bvrs["hash"]]
|
||||
bvrs["distribution"] = distributions_rvs[bvrs["distribution"]]
|
||||
return BehaviorDict(self, bvrs)
|
||||
|
||||
def set_behaviors(self, behaviors):
|
||||
"""Sets the behaviors on the underlying C client instance.
|
||||
|
||||
Takes care of morphing the `hash` key, if specified, into the
|
||||
corresponding integer constant (which the C client expects.) If,
|
||||
however, an unknown value is specified, it's passed on to the C client
|
||||
(where it most surely will error out.)
|
||||
|
||||
This also happens for `distribution`.
|
||||
"""
|
||||
behaviors = behaviors.copy()
|
||||
if behaviors.get("hash") is not None:
|
||||
behaviors["hash"] = hashers[behaviors["hash"]]
|
||||
if behaviors.get("ketama_hash") is not None:
|
||||
behaviors["ketama_hash"] = hashers[behaviors["ketama_hash"]]
|
||||
if behaviors.get("distribution") is not None:
|
||||
behaviors["distribution"] = distributions[behaviors["distribution"]]
|
||||
return super(Client, self).set_behaviors(behaviors)
|
||||
|
||||
behaviors = property(get_behaviors, set_behaviors)
|
||||
@property
|
||||
def behaviours(self):
|
||||
raise AttributeError("nobody uses british spellings")
|
||||
|
||||
def clone(self):
|
||||
obj = super(Client, self).clone()
|
||||
obj.addresses = list(self.addresses)
|
||||
obj.binary = self.binary
|
||||
return obj
|
||||
|
|
@ -0,0 +1,40 @@
|
|||
"""Constants and functionality related to them"""
|
||||
|
||||
import _pylibmc
|
||||
|
||||
#: Mapping of
|
||||
errors = tuple(e for (n, e) in _pylibmc.exceptions)
|
||||
# *Cough* Uhm, not the prettiest of things but this unpacks all exception
|
||||
# objects and sets them on the package module object currently constructed.
|
||||
import sys
|
||||
modpkg = sys.modules[__package__]
|
||||
modself = sys.modules[__package__]
|
||||
for name, exc in _pylibmc.exceptions:
|
||||
setattr(modself, name, exc)
|
||||
setattr(modpkg, name, exc)
|
||||
|
||||
hashers, hashers_rvs = {}, {}
|
||||
distributions, distributions_rvs = {}, {}
|
||||
# Not the prettiest way of doing things, but works well.
|
||||
for name in dir(_pylibmc):
|
||||
if name.startswith("hash_"):
|
||||
key, value = name[5:], getattr(_pylibmc, name)
|
||||
hashers[key] = value
|
||||
hashers_rvs[value] = key
|
||||
elif name.startswith("distribution_"):
|
||||
key, value = name[13:].replace("_", " "), getattr(_pylibmc, name)
|
||||
distributions[key] = value
|
||||
distributions_rvs[value] = key
|
||||
|
||||
class BehaviorDict(dict):
|
||||
def __init__(self, client, *args, **kwds):
|
||||
super(BehaviorDict, self).__init__(*args, **kwds)
|
||||
self.client = client
|
||||
|
||||
def __setitem__(self, name, value):
|
||||
super(BehaviorDict, self).__setitem__(name, value)
|
||||
self.client.set_behaviors({name: value})
|
||||
|
||||
def update(self, d):
|
||||
super(BehaviorDict, self).update(d)
|
||||
self.client.set_behaviors(d.copy())
|
||||
|
|
@ -0,0 +1,97 @@
|
|||
"""Pooling"""
|
||||
|
||||
from __future__ import with_statement
|
||||
|
||||
from contextlib import contextmanager
|
||||
from Queue import Queue
|
||||
|
||||
class ClientPool(Queue):
|
||||
"""Client pooling helper.
|
||||
|
||||
This is mostly useful in threaded environments, because a client isn't
|
||||
thread-safe at all. Instead, what you want to do is have each thread use
|
||||
its own client, but you don't want to reconnect these all the time.
|
||||
|
||||
The solution is a pool, and this class is a helper for that.
|
||||
|
||||
>>> mc = Client(["127.0.0.1"])
|
||||
>>> pool = ClientPool()
|
||||
>>> pool.fill(mc, 4)
|
||||
>>> with pool.reserve() as mc:
|
||||
... mc.set("hi", "ho")
|
||||
... mc.delete("hi")
|
||||
...
|
||||
True
|
||||
True
|
||||
"""
|
||||
|
||||
def __init__(self, mc=None, n_slots=None):
|
||||
Queue.__init__(self, n_slots)
|
||||
if mc is not None:
|
||||
self.fill(mc, n_slots)
|
||||
|
||||
@contextmanager
|
||||
def reserve(self, timeout=None):
|
||||
"""Context manager for reserving a client from the pool.
|
||||
|
||||
If *timeout* is given, it specifiecs how long to wait for a client to
|
||||
become available.
|
||||
"""
|
||||
mc = self.get(True, timeout=timeout)
|
||||
try:
|
||||
yield mc
|
||||
finally:
|
||||
self.put(mc)
|
||||
|
||||
def fill(self, mc, n_slots):
|
||||
"""Fill *n_slots* of the pool with clones of *mc*."""
|
||||
for i in xrange(n_slots):
|
||||
self.put(mc.clone())
|
||||
|
||||
class ThreadMappedPool(dict):
|
||||
"""Much like the *ClientPool*, helps you with pooling.
|
||||
|
||||
In a threaded environment, you'd most likely want to have a client per
|
||||
thread. And there'd be no harm in one thread keeping the same client at all
|
||||
times. So, why not map threads to clients? That's what this class does.
|
||||
|
||||
If a client is reserved, this class checks for a key based on the current
|
||||
thread, and if none exists, clones the master client and inserts that key.
|
||||
|
||||
>>> mc = Client(["127.0.0.1"])
|
||||
>>> pool = ThreadMappedPool(mc)
|
||||
>>> with pool.reserve() as mc:
|
||||
... mc.set("hi", "ho")
|
||||
... mc.delete("hi")
|
||||
...
|
||||
True
|
||||
True
|
||||
"""
|
||||
|
||||
def __new__(cls, master):
|
||||
return super(ThreadMappedPool, cls).__new__(cls)
|
||||
|
||||
def __init__(self, master):
|
||||
self.master = master
|
||||
|
||||
@contextmanager
|
||||
def reserve(self):
|
||||
"""Reserve a client.
|
||||
|
||||
Creates a new client based on the master client if none exists for the
|
||||
current thread.
|
||||
"""
|
||||
key = thread.get_ident()
|
||||
mc = self.pop(key, None)
|
||||
if mc is None:
|
||||
mc = self.master.clone()
|
||||
try:
|
||||
yield mc
|
||||
finally:
|
||||
self[key] = mc
|
||||
|
||||
# This makes sure ThreadMappedPool doesn't exist with non-thread Pythons.
|
||||
try:
|
||||
import thread
|
||||
except ImportError:
|
||||
ThreadMappedPool = None
|
||||
2
setup.py
2
setup.py
|
|
@ -74,4 +74,4 @@ setup(name="pylibmc", version=version,
|
|||
license="3-clause BSD <http://www.opensource.org/licenses/bsd-license.php>",
|
||||
description="Quick and small memcached client for Python",
|
||||
long_description=readme_text,
|
||||
ext_modules=[pylibmc_ext], py_modules=["pylibmc"])
|
||||
ext_modules=[pylibmc_ext], packages=["pylibmc"])
|
||||
|
|
|
|||
Reference in New Issue