719 lines
22 KiB
Python
719 lines
22 KiB
Python
# vim: tabstop=4 shiftwidth=4 softtabstop=4
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# Copyright 2011 Cloudscaling Group, Inc
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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import pprint
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import socket
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import string
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import sys
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import types
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import uuid
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import eventlet
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from eventlet.green import zmq
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import greenlet
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from nova.openstack.common import cfg
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from nova.openstack.common.gettextutils import _
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from nova.openstack.common import importutils
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from nova.openstack.common import jsonutils
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from nova.openstack.common.rpc import common as rpc_common
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# for convenience, are not modified.
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pformat = pprint.pformat
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Timeout = eventlet.timeout.Timeout
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LOG = rpc_common.LOG
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RemoteError = rpc_common.RemoteError
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RPCException = rpc_common.RPCException
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zmq_opts = [
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cfg.StrOpt('rpc_zmq_bind_address', default='*',
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help='ZeroMQ bind address. Should be a wildcard (*), '
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'an ethernet interface, or IP. '
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'The "host" option should point or resolve to this '
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'address.'),
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# The module.Class to use for matchmaking.
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cfg.StrOpt(
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'rpc_zmq_matchmaker',
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default=('nova.openstack.common.rpc.'
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'matchmaker.MatchMakerLocalhost'),
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help='MatchMaker driver',
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),
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# The following port is unassigned by IANA as of 2012-05-21
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cfg.IntOpt('rpc_zmq_port', default=9501,
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help='ZeroMQ receiver listening port'),
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cfg.IntOpt('rpc_zmq_contexts', default=1,
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help='Number of ZeroMQ contexts, defaults to 1'),
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cfg.StrOpt('rpc_zmq_ipc_dir', default='/var/run/openstack',
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help='Directory for holding IPC sockets'),
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cfg.StrOpt('rpc_zmq_host', default=socket.gethostname(),
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help='Name of this node. Must be a valid hostname, FQDN, or '
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'IP address. Must match "host" option, if running Nova.')
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]
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# These globals are defined in register_opts(conf),
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# a mandatory initialization call
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CONF = None
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ZMQ_CTX = None # ZeroMQ Context, must be global.
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matchmaker = None # memoized matchmaker object
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def _serialize(data):
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"""
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Serialization wrapper
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We prefer using JSON, but it cannot encode all types.
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Error if a developer passes us bad data.
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"""
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try:
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return str(jsonutils.dumps(data, ensure_ascii=True))
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except TypeError:
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LOG.error(_("JSON serialization failed."))
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raise
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def _deserialize(data):
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"""
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Deserialization wrapper
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"""
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LOG.debug(_("Deserializing: %s"), data)
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return jsonutils.loads(data)
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class ZmqSocket(object):
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"""
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A tiny wrapper around ZeroMQ to simplify the send/recv protocol
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and connection management.
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Can be used as a Context (supports the 'with' statement).
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"""
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def __init__(self, addr, zmq_type, bind=True, subscribe=None):
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self.sock = ZMQ_CTX.socket(zmq_type)
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self.addr = addr
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self.type = zmq_type
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self.subscriptions = []
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# Support failures on sending/receiving on wrong socket type.
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self.can_recv = zmq_type in (zmq.PULL, zmq.SUB)
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self.can_send = zmq_type in (zmq.PUSH, zmq.PUB)
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self.can_sub = zmq_type in (zmq.SUB, )
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# Support list, str, & None for subscribe arg (cast to list)
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do_sub = {
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list: subscribe,
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str: [subscribe],
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type(None): []
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}[type(subscribe)]
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for f in do_sub:
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self.subscribe(f)
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str_data = {'addr': addr, 'type': self.socket_s(),
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'subscribe': subscribe, 'bind': bind}
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LOG.debug(_("Connecting to %(addr)s with %(type)s"), str_data)
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LOG.debug(_("-> Subscribed to %(subscribe)s"), str_data)
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LOG.debug(_("-> bind: %(bind)s"), str_data)
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try:
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if bind:
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self.sock.bind(addr)
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else:
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self.sock.connect(addr)
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except Exception:
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raise RPCException(_("Could not open socket."))
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def socket_s(self):
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"""Get socket type as string."""
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t_enum = ('PUSH', 'PULL', 'PUB', 'SUB', 'REP', 'REQ', 'ROUTER',
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'DEALER')
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return dict(map(lambda t: (getattr(zmq, t), t), t_enum))[self.type]
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def subscribe(self, msg_filter):
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"""Subscribe."""
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if not self.can_sub:
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raise RPCException("Cannot subscribe on this socket.")
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LOG.debug(_("Subscribing to %s"), msg_filter)
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try:
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self.sock.setsockopt(zmq.SUBSCRIBE, msg_filter)
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except Exception:
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return
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self.subscriptions.append(msg_filter)
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def unsubscribe(self, msg_filter):
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"""Unsubscribe."""
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if msg_filter not in self.subscriptions:
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return
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self.sock.setsockopt(zmq.UNSUBSCRIBE, msg_filter)
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self.subscriptions.remove(msg_filter)
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def close(self):
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if self.sock is None or self.sock.closed:
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return
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# We must unsubscribe, or we'll leak descriptors.
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if len(self.subscriptions) > 0:
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for f in self.subscriptions:
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try:
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self.sock.setsockopt(zmq.UNSUBSCRIBE, f)
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except Exception:
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pass
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self.subscriptions = []
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# Linger -1 prevents lost/dropped messages
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try:
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self.sock.close(linger=-1)
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except Exception:
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pass
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self.sock = None
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def recv(self):
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if not self.can_recv:
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raise RPCException(_("You cannot recv on this socket."))
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return self.sock.recv_multipart()
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def send(self, data):
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if not self.can_send:
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raise RPCException(_("You cannot send on this socket."))
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self.sock.send_multipart(data)
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class ZmqClient(object):
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"""Client for ZMQ sockets."""
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def __init__(self, addr, socket_type=zmq.PUSH, bind=False):
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self.outq = ZmqSocket(addr, socket_type, bind=bind)
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def cast(self, msg_id, topic, data):
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self.outq.send([str(msg_id), str(topic), str('cast'),
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_serialize(data)])
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def close(self):
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self.outq.close()
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class RpcContext(rpc_common.CommonRpcContext):
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"""Context that supports replying to a rpc.call."""
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def __init__(self, **kwargs):
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self.replies = []
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super(RpcContext, self).__init__(**kwargs)
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def deepcopy(self):
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values = self.to_dict()
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values['replies'] = self.replies
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return self.__class__(**values)
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def reply(self, reply=None, failure=None, ending=False):
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if ending:
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return
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self.replies.append(reply)
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@classmethod
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def marshal(self, ctx):
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ctx_data = ctx.to_dict()
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return _serialize(ctx_data)
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@classmethod
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def unmarshal(self, data):
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return RpcContext.from_dict(_deserialize(data))
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class InternalContext(object):
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"""Used by ConsumerBase as a private context for - methods."""
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def __init__(self, proxy):
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self.proxy = proxy
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self.msg_waiter = None
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def _get_response(self, ctx, proxy, topic, data):
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"""Process a curried message and cast the result to topic."""
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LOG.debug(_("Running func with context: %s"), ctx.to_dict())
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data.setdefault('version', None)
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data.setdefault('args', [])
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try:
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result = proxy.dispatch(
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ctx, data['version'], data['method'], **data['args'])
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return ConsumerBase.normalize_reply(result, ctx.replies)
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except greenlet.GreenletExit:
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# ignore these since they are just from shutdowns
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pass
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except Exception:
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return {'exc':
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rpc_common.serialize_remote_exception(sys.exc_info())}
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def reply(self, ctx, proxy,
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msg_id=None, context=None, topic=None, msg=None):
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"""Reply to a casted call."""
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# Our real method is curried into msg['args']
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child_ctx = RpcContext.unmarshal(msg[0])
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response = ConsumerBase.normalize_reply(
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self._get_response(child_ctx, proxy, topic, msg[1]),
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ctx.replies)
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LOG.debug(_("Sending reply"))
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cast(CONF, ctx, topic, {
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'method': '-process_reply',
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'args': {
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'msg_id': msg_id,
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'response': response
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}
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})
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class ConsumerBase(object):
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"""Base Consumer."""
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def __init__(self):
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self.private_ctx = InternalContext(None)
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@classmethod
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def normalize_reply(self, result, replies):
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#TODO(ewindisch): re-evaluate and document this method.
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if isinstance(result, types.GeneratorType):
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return list(result)
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elif replies:
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return replies
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else:
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return [result]
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def process(self, style, target, proxy, ctx, data):
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# Method starting with - are
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# processed internally. (non-valid method name)
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method = data['method']
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# Internal method
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# uses internal context for safety.
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if data['method'][0] == '-':
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# For reply / process_reply
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method = method[1:]
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if method == 'reply':
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self.private_ctx.reply(ctx, proxy, **data['args'])
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return
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data.setdefault('version', None)
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data.setdefault('args', [])
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proxy.dispatch(ctx, data['version'],
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data['method'], **data['args'])
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class ZmqBaseReactor(ConsumerBase):
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"""
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A consumer class implementing a
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centralized casting broker (PULL-PUSH)
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for RoundRobin requests.
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"""
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def __init__(self, conf):
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super(ZmqBaseReactor, self).__init__()
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self.mapping = {}
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self.proxies = {}
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self.threads = []
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self.sockets = []
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self.subscribe = {}
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self.pool = eventlet.greenpool.GreenPool(conf.rpc_thread_pool_size)
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def register(self, proxy, in_addr, zmq_type_in, out_addr=None,
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zmq_type_out=None, in_bind=True, out_bind=True,
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subscribe=None):
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LOG.info(_("Registering reactor"))
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if zmq_type_in not in (zmq.PULL, zmq.SUB):
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raise RPCException("Bad input socktype")
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# Items push in.
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inq = ZmqSocket(in_addr, zmq_type_in, bind=in_bind,
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subscribe=subscribe)
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self.proxies[inq] = proxy
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self.sockets.append(inq)
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LOG.info(_("In reactor registered"))
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if not out_addr:
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return
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if zmq_type_out not in (zmq.PUSH, zmq.PUB):
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raise RPCException("Bad output socktype")
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# Items push out.
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outq = ZmqSocket(out_addr, zmq_type_out, bind=out_bind)
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self.mapping[inq] = outq
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self.mapping[outq] = inq
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self.sockets.append(outq)
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LOG.info(_("Out reactor registered"))
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def consume_in_thread(self):
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def _consume(sock):
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LOG.info(_("Consuming socket"))
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while True:
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self.consume(sock)
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for k in self.proxies.keys():
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self.threads.append(
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self.pool.spawn(_consume, k)
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)
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def wait(self):
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for t in self.threads:
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t.wait()
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def close(self):
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for s in self.sockets:
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s.close()
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for t in self.threads:
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t.kill()
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class ZmqProxy(ZmqBaseReactor):
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"""
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A consumer class implementing a
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topic-based proxy, forwarding to
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IPC sockets.
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"""
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def __init__(self, conf):
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super(ZmqProxy, self).__init__(conf)
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self.topic_proxy = {}
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ipc_dir = CONF.rpc_zmq_ipc_dir
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self.topic_proxy['zmq_replies'] = \
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ZmqSocket("ipc://%s/zmq_topic_zmq_replies" % (ipc_dir, ),
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zmq.PUB, bind=True)
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self.sockets.append(self.topic_proxy['zmq_replies'])
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def consume(self, sock):
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ipc_dir = CONF.rpc_zmq_ipc_dir
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#TODO(ewindisch): use zero-copy (i.e. references, not copying)
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data = sock.recv()
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msg_id, topic, style, in_msg = data
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topic = topic.split('.', 1)[0]
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LOG.debug(_("CONSUMER GOT %s"), ' '.join(map(pformat, data)))
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# Handle zmq_replies magic
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if topic.startswith('fanout~'):
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sock_type = zmq.PUB
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elif topic.startswith('zmq_replies'):
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sock_type = zmq.PUB
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inside = _deserialize(in_msg)
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msg_id = inside[-1]['args']['msg_id']
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response = inside[-1]['args']['response']
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LOG.debug(_("->response->%s"), response)
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data = [str(msg_id), _serialize(response)]
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else:
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sock_type = zmq.PUSH
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if not topic in self.topic_proxy:
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outq = ZmqSocket("ipc://%s/zmq_topic_%s" % (ipc_dir, topic),
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sock_type, bind=True)
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self.topic_proxy[topic] = outq
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self.sockets.append(outq)
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LOG.info(_("Created topic proxy: %s"), topic)
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# It takes some time for a pub socket to open,
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# before we can have any faith in doing a send() to it.
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if sock_type == zmq.PUB:
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eventlet.sleep(.5)
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LOG.debug(_("ROUTER RELAY-OUT START %(data)s") % {'data': data})
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self.topic_proxy[topic].send(data)
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LOG.debug(_("ROUTER RELAY-OUT SUCCEEDED %(data)s") % {'data': data})
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class ZmqReactor(ZmqBaseReactor):
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"""
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A consumer class implementing a
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consumer for messages. Can also be
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used as a 1:1 proxy
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"""
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def __init__(self, conf):
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super(ZmqReactor, self).__init__(conf)
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def consume(self, sock):
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#TODO(ewindisch): use zero-copy (i.e. references, not copying)
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data = sock.recv()
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LOG.debug(_("CONSUMER RECEIVED DATA: %s"), data)
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if sock in self.mapping:
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LOG.debug(_("ROUTER RELAY-OUT %(data)s") % {
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'data': data})
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self.mapping[sock].send(data)
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return
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msg_id, topic, style, in_msg = data
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ctx, request = _deserialize(in_msg)
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ctx = RpcContext.unmarshal(ctx)
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proxy = self.proxies[sock]
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self.pool.spawn_n(self.process, style, topic,
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proxy, ctx, request)
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class Connection(rpc_common.Connection):
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"""Manages connections and threads."""
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def __init__(self, conf):
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self.reactor = ZmqReactor(conf)
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def create_consumer(self, topic, proxy, fanout=False):
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# Only consume on the base topic name.
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topic = topic.split('.', 1)[0]
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LOG.info(_("Create Consumer for topic (%(topic)s)") %
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{'topic': topic})
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# Subscription scenarios
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if fanout:
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subscribe = ('', fanout)[type(fanout) == str]
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sock_type = zmq.SUB
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topic = 'fanout~' + topic
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else:
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sock_type = zmq.PULL
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subscribe = None
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# Receive messages from (local) proxy
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inaddr = "ipc://%s/zmq_topic_%s" % \
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(CONF.rpc_zmq_ipc_dir, topic)
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LOG.debug(_("Consumer is a zmq.%s"),
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['PULL', 'SUB'][sock_type == zmq.SUB])
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self.reactor.register(proxy, inaddr, sock_type,
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subscribe=subscribe, in_bind=False)
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def close(self):
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self.reactor.close()
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def wait(self):
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self.reactor.wait()
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def consume_in_thread(self):
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self.reactor.consume_in_thread()
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def _cast(addr, context, msg_id, topic, msg, timeout=None):
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timeout_cast = timeout or CONF.rpc_cast_timeout
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payload = [RpcContext.marshal(context), msg]
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|
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with Timeout(timeout_cast, exception=rpc_common.Timeout):
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try:
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conn = ZmqClient(addr)
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|
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# assumes cast can't return an exception
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conn.cast(msg_id, topic, payload)
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except zmq.ZMQError:
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raise RPCException("Cast failed. ZMQ Socket Exception")
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finally:
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if 'conn' in vars():
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conn.close()
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|
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|
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def _call(addr, context, msg_id, topic, msg, timeout=None):
|
|
# timeout_response is how long we wait for a response
|
|
timeout = timeout or CONF.rpc_response_timeout
|
|
|
|
# The msg_id is used to track replies.
|
|
msg_id = uuid.uuid4().hex
|
|
|
|
# Replies always come into the reply service.
|
|
reply_topic = "zmq_replies.%s" % CONF.rpc_zmq_host
|
|
|
|
LOG.debug(_("Creating payload"))
|
|
# Curry the original request into a reply method.
|
|
mcontext = RpcContext.marshal(context)
|
|
payload = {
|
|
'method': '-reply',
|
|
'args': {
|
|
'msg_id': msg_id,
|
|
'context': mcontext,
|
|
'topic': reply_topic,
|
|
'msg': [mcontext, msg]
|
|
}
|
|
}
|
|
|
|
LOG.debug(_("Creating queue socket for reply waiter"))
|
|
|
|
# Messages arriving async.
|
|
# TODO(ewindisch): have reply consumer with dynamic subscription mgmt
|
|
with Timeout(timeout, exception=rpc_common.Timeout):
|
|
try:
|
|
msg_waiter = ZmqSocket(
|
|
"ipc://%s/zmq_topic_zmq_replies" % CONF.rpc_zmq_ipc_dir,
|
|
zmq.SUB, subscribe=msg_id, bind=False
|
|
)
|
|
|
|
LOG.debug(_("Sending cast"))
|
|
_cast(addr, context, msg_id, topic, payload)
|
|
|
|
LOG.debug(_("Cast sent; Waiting reply"))
|
|
# Blocks until receives reply
|
|
msg = msg_waiter.recv()
|
|
LOG.debug(_("Received message: %s"), msg)
|
|
LOG.debug(_("Unpacking response"))
|
|
responses = _deserialize(msg[-1])
|
|
# ZMQError trumps the Timeout error.
|
|
except zmq.ZMQError:
|
|
raise RPCException("ZMQ Socket Error")
|
|
finally:
|
|
if 'msg_waiter' in vars():
|
|
msg_waiter.close()
|
|
|
|
# It seems we don't need to do all of the following,
|
|
# but perhaps it would be useful for multicall?
|
|
# One effect of this is that we're checking all
|
|
# responses for Exceptions.
|
|
for resp in responses:
|
|
if isinstance(resp, types.DictType) and 'exc' in resp:
|
|
raise rpc_common.deserialize_remote_exception(CONF, resp['exc'])
|
|
|
|
return responses[-1]
|
|
|
|
|
|
def _multi_send(method, context, topic, msg, timeout=None):
|
|
"""
|
|
Wraps the sending of messages,
|
|
dispatches to the matchmaker and sends
|
|
message to all relevant hosts.
|
|
"""
|
|
conf = CONF
|
|
LOG.debug(_("%(msg)s") % {'msg': ' '.join(map(pformat, (topic, msg)))})
|
|
|
|
queues = matchmaker.queues(topic)
|
|
LOG.debug(_("Sending message(s) to: %s"), queues)
|
|
|
|
# Don't stack if we have no matchmaker results
|
|
if len(queues) == 0:
|
|
LOG.warn(_("No matchmaker results. Not casting."))
|
|
# While not strictly a timeout, callers know how to handle
|
|
# this exception and a timeout isn't too big a lie.
|
|
raise rpc_common.Timeout, "No match from matchmaker."
|
|
|
|
# This supports brokerless fanout (addresses > 1)
|
|
for queue in queues:
|
|
(_topic, ip_addr) = queue
|
|
_addr = "tcp://%s:%s" % (ip_addr, conf.rpc_zmq_port)
|
|
|
|
if method.__name__ == '_cast':
|
|
eventlet.spawn_n(method, _addr, context,
|
|
_topic, _topic, msg, timeout)
|
|
return
|
|
return method(_addr, context, _topic, _topic, msg, timeout)
|
|
|
|
|
|
def create_connection(conf, new=True):
|
|
return Connection(conf)
|
|
|
|
|
|
def multicall(conf, *args, **kwargs):
|
|
"""Multiple calls."""
|
|
return _multi_send(_call, *args, **kwargs)
|
|
|
|
|
|
def call(conf, *args, **kwargs):
|
|
"""Send a message, expect a response."""
|
|
data = _multi_send(_call, *args, **kwargs)
|
|
return data[-1]
|
|
|
|
|
|
def cast(conf, *args, **kwargs):
|
|
"""Send a message expecting no reply."""
|
|
_multi_send(_cast, *args, **kwargs)
|
|
|
|
|
|
def fanout_cast(conf, context, topic, msg, **kwargs):
|
|
"""Send a message to all listening and expect no reply."""
|
|
# NOTE(ewindisch): fanout~ is used because it avoid splitting on .
|
|
# and acts as a non-subtle hint to the matchmaker and ZmqProxy.
|
|
_multi_send(_cast, context, 'fanout~' + str(topic), msg, **kwargs)
|
|
|
|
|
|
def notify(conf, context, topic, msg, **kwargs):
|
|
"""
|
|
Send notification event.
|
|
Notifications are sent to topic-priority.
|
|
This differs from the AMQP drivers which send to topic.priority.
|
|
"""
|
|
# NOTE(ewindisch): dot-priority in rpc notifier does not
|
|
# work with our assumptions.
|
|
topic.replace('.', '-')
|
|
cast(conf, context, topic, msg, **kwargs)
|
|
|
|
|
|
def cleanup():
|
|
"""Clean up resources in use by implementation."""
|
|
global ZMQ_CTX
|
|
global matchmaker
|
|
matchmaker = None
|
|
ZMQ_CTX.term()
|
|
ZMQ_CTX = None
|
|
|
|
|
|
def register_opts(conf):
|
|
"""Registration of options for this driver."""
|
|
#NOTE(ewindisch): ZMQ_CTX and matchmaker
|
|
# are initialized here as this is as good
|
|
# an initialization method as any.
|
|
|
|
# We memoize through these globals
|
|
global ZMQ_CTX
|
|
global matchmaker
|
|
global CONF
|
|
|
|
if not CONF:
|
|
conf.register_opts(zmq_opts)
|
|
CONF = conf
|
|
# Don't re-set, if this method is called twice.
|
|
if not ZMQ_CTX:
|
|
ZMQ_CTX = zmq.Context(conf.rpc_zmq_contexts)
|
|
if not matchmaker:
|
|
# rpc_zmq_matchmaker should be set to a 'module.Class'
|
|
mm_path = conf.rpc_zmq_matchmaker.split('.')
|
|
mm_module = '.'.join(mm_path[:-1])
|
|
mm_class = mm_path[-1]
|
|
|
|
# Only initialize a class.
|
|
if mm_path[-1][0] not in string.ascii_uppercase:
|
|
LOG.error(_("Matchmaker could not be loaded.\n"
|
|
"rpc_zmq_matchmaker is not a class."))
|
|
raise RPCException(_("Error loading Matchmaker."))
|
|
|
|
mm_impl = importutils.import_module(mm_module)
|
|
mm_constructor = getattr(mm_impl, mm_class)
|
|
matchmaker = mm_constructor()
|
|
|
|
|
|
register_opts(cfg.CONF)
|