server/cwzmq.py
author David Douard <david.douard@logilab.fr>
Tue, 04 Dec 2012 16:16:08 +0100
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# -*- coding: utf-8 -*-
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# copyright 2012 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
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# contact http://www.logilab.fr/ -- mailto:contact@logilab.fr
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#
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# This file is part of CubicWeb.
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#
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# CubicWeb is free software: you can redistribute it and/or modify it under the
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# terms of the GNU Lesser General Public License as published by the Free
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# Software Foundation, either version 2.1 of the License, or (at your option)
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# any later version.
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#
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# CubicWeb is distributed in the hope that it will be useful, but WITHOUT
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# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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# FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more
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# details.
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#
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# You should have received a copy of the GNU Lesser General Public License along
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# with CubicWeb.  If not, see <http://www.gnu.org/licenses/>.
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from threading import Thread
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import cPickle
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import traceback
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import zmq
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from zmq.eventloop import ioloop
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import zmq.eventloop.zmqstream
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from logging import getLogger
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from cubicweb import set_log_methods
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from cubicweb.server.server import QuitEvent
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ctx = zmq.Context()
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class ZMQComm(object):
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    """
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    A simple ZMQ-based notification bus.
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    There should at most one instance of this class attached to a
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    Repository. A typical usage may be something like::
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        def callback(msg):
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            self.info('received message: %s', ' '.join(msg))
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        repo.app_instances_bus.subscribe('hello', callback)
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    to subsribe to the 'hello' kind of message. On the other side, to
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    emit a notification, call::
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       repo.app_instances_bus.publish(['hello', 'world'])
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    See http://docs.cubicweb.org for more details.
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    """
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    def __init__(self):
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        self.ioloop = ioloop.IOLoop()
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        self._topics = {}
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        self._subscribers = []
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        self.publisher = None
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    def add_publisher(self, address):
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        assert self.publisher is None, "more than one publisher is not supported"
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        self.publisher = Publisher(self.ioloop, address)
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    def add_subscription(self, topic, callback):
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        for subscriber in self._subscribers:
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            subscriber.subscribe(topic, callback)
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        self._topics[topic] = callback
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    def add_subscriber(self, address):
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        subscriber = Subscriber(self.ioloop, address)
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        for topic, callback in self._topics.iteritems():
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            subscriber.subscribe(topic, callback)
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        self._subscribers.append(subscriber)
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    def publish(self, msg):
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        assert self.publisher is not None, "can't publish without a publisher"
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        self.publisher.send(msg)
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    def start(self):
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        Thread(target=self.ioloop.start).start()
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    def stop(self):
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        self.ioloop.add_callback(self.ioloop.stop)
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    def __del__(self):
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        self.ioloop.close()
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class Publisher(object):
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    def __init__(self, ioloop, address):
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        self.address = address
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        self._topics = {}
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        self._subscribers = []
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        self.ioloop = ioloop
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        def callback():
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            s = ctx.socket(zmq.PUB)
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            self.stream = zmq.eventloop.zmqstream.ZMQStream(s, io_loop=ioloop)
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            self.stream.bind(self.address)
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            self.debug('start publisher on %s', self.address)
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        ioloop.add_callback(callback)
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    99
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    def send(self, msg):
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        self.ioloop.add_callback(lambda:self.stream.send_multipart(msg))
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   103
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class Subscriber(object):
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    def __init__(self, ioloop, address):
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        self.address = address
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        self.dispatch_table = {}
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        self.ioloop = ioloop
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        def callback():
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            s = ctx.socket(zmq.SUB)
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            self.stream = zmq.eventloop.zmqstream.ZMQStream(s, io_loop=ioloop)
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            self.stream.on_recv(self.dispatch)
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            self.stream.connect(self.address)
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            self.debug('start subscriber on %s', self.address)
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        ioloop.add_callback(callback)
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    def dispatch(self, msg):
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        try:
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            f = self.dispatch_table[msg[0]]
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        except KeyError:
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            return
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        f(msg)
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    def subscribe(self, topic, callback):
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        self.dispatch_table[topic] = callback
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        self.ioloop.add_callback(lambda: self.stream.setsockopt(zmq.SUBSCRIBE, topic))
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class ZMQRepositoryServer(object):
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    def __init__(self, repository):
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        """make the repository available as a PyRO object"""
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        self.address = None
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        self.repo = repository
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        self.socket = None
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        self.stream = None
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        self.loop = ioloop.IOLoop()
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        # event queue
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        self.events = []
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    def connect(self, address):
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        self.address = address
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    def run(self):
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        """enter the service loop"""
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        # start repository looping tasks
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        self.socket = ctx.socket(zmq.REP)
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        self.stream = zmq.eventloop.zmqstream.ZMQStream(self.socket, io_loop=self.loop)
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        self.stream.bind(self.address)
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        self.info('ZMQ server bound on: %s', self.address)
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        self.stream.on_recv(self.process_cmds)
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        try:
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            self.loop.start()
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        except zmq.ZMQError:
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            self.warning('ZMQ event loop killed')
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        self.quit()
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    def trigger_events(self):
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        """trigger ready events"""
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        for event in self.events[:]:
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            if event.is_ready():
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                self.info('starting event %s', event)
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                event.fire(self)
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                try:
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                    event.update()
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                except Finished:
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                    self.events.remove(event)
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    def process_cmd(self, cmd):
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        """Delegate the given command to the repository.
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        ``cmd`` is a list of (method_name, args, kwargs)
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        where ``args`` is a list of positional arguments
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        and ``kwargs`` is a dictionnary of named arguments.
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        >>> rset = delegate_to_repo(["execute", [sessionid], {'rql': rql}])
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        :note1: ``kwargs`` may be ommited
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            >>> rset = delegate_to_repo(["execute", [sessionid, rql]])
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        :note2: both ``args`` and ``kwargs`` may be omitted
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            >>> schema = delegate_to_repo(["get_schema"])
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            >>> schema = delegate_to_repo("get_schema") # also allowed
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        """
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        cmd = cPickle.loads(cmd)
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        if not cmd:
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            raise AttributeError('function name required')
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        if isinstance(cmd, basestring):
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            cmd = [cmd]
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        if len(cmd) < 2:
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            cmd.append(())
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        if len(cmd) < 3:
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            cmd.append({})
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        cmd  = list(cmd) + [(), {}]
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        funcname, args, kwargs = cmd[:3]
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        result = getattr(self.repo, funcname)(*args, **kwargs)
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        return result
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    def process_cmds(self, cmds):
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        """Callback intended to be used with ``on_recv``.
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        Call ``delegate_to_repo`` on each command and send a pickled of
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        each result recursively.
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        Any exception are catched, pickled and sent.
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        """
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        try:
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            for cmd in cmds:
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                result = self.process_cmd(cmd)
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                self.send_data(result)
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        except Exception, exc:
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            traceback.print_exc()
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            self.send_data(exc)
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    def send_data(self, data):
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        self.socket.send_pyobj(data)
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    def quit(self, shutdown_repo=False):
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        """stop the server"""
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        self.info('Quitting ZMQ server')
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        try:
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            self.loop.add_callback(self.loop.stop)
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            self.stream.on_recv(None)
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            self.stream.close()
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        except Exception, e:
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            print e
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            pass
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        if shutdown_repo and not self.repo.shutting_down:
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            event = QuitEvent()
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            event.fire(self)
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    # server utilitities ######################################################
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    def install_sig_handlers(self):
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        """install signal handlers"""
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        import signal
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        self.info('installing signal handlers')
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        signal.signal(signal.SIGINT, lambda x, y, s=self: s.quit(shutdown_repo=True))
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        signal.signal(signal.SIGTERM, lambda x, y, s=self: s.quit(shutdown_repo=True))
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    # these are overridden by set_log_methods below
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    # only defining here to prevent pylint from complaining
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    @classmethod
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    def info(cls, msg, *a, **kw):
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        pass
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set_log_methods(Publisher, getLogger('cubicweb.zmq.pub'))
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set_log_methods(Subscriber, getLogger('cubicweb.zmq.sub'))
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set_log_methods(ZMQRepositoryServer, getLogger('cubicweb.zmq.repo'))