622 lines
25 KiB
Python
622 lines
25 KiB
Python
# Copyright 2014, Red Hat, 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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"""
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Controller that manages the interface between the driver and the messaging
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service.
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This module defines a Controller class that is responsible for performing
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messaging-related operations (Tasks) requested by the driver, and for managing
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the connection to the messaging service. The Controller creates a background
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thread which performs all messaging operations and socket I/O. The
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Controller's messaging logic is executed in the background thread via lambda
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functions scheduled by the Controller.
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"""
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import abc
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import collections
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import logging
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import threading
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import uuid
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import pyngus
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from six import moves
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from oslo.config import cfg
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from oslo.messaging._drivers.protocols.amqp import eventloop
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LOG = logging.getLogger(__name__)
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_amqp1_opts = [
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cfg.StrOpt('server_request_prefix',
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default='exclusive',
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help="address prefix used when sending to a specific server"),
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cfg.StrOpt('broadcast_prefix',
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default='broadcast',
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help="address prefix used when broadcasting to all servers"),
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cfg.StrOpt('group_request_prefix',
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default='unicast',
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help="address prefix when sending to any server in group"),
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cfg.StrOpt('container_name',
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default=None,
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help='Name for the AMQP container'),
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cfg.IntOpt('idle_timeout',
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default=0, # disabled
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help='Timeout for inactive connections (in seconds)'),
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cfg.BoolOpt('trace',
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default=False,
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help='Debug: dump AMQP frames to stdout'),
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cfg.StrOpt('ssl_ca_file',
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default='',
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help="CA certificate PEM file for verifing server certificate"),
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cfg.StrOpt('ssl_cert_file',
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default='',
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help='Identifying certificate PEM file to present to clients'),
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cfg.StrOpt('ssl_key_file',
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default='',
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help='Private key PEM file used to sign cert_file certificate'),
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cfg.StrOpt('ssl_key_password',
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default=None,
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help='Password for decrypting ssl_key_file (if encrypted)'),
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cfg.BoolOpt('allow_insecure_clients',
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default=False,
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help='Accept clients using either SSL or plain TCP')
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]
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class Task(object):
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"""Perform a messaging operation via the Controller."""
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@abc.abstractmethod
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def execute(self, controller):
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"""This method will be run on the eventloop thread."""
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class Replies(pyngus.ReceiverEventHandler):
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"""This is the receiving link for all reply messages. Messages are routed
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to the proper Listener's incoming queue using the correlation-id header in
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the message.
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"""
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def __init__(self, connection, on_ready):
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self._correlation = {} # map of correlation-id to response queue
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self._ready = False
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self._on_ready = on_ready
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self._receiver = connection.create_receiver("replies",
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event_handler=self)
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# capacity determines the maximum number of reply messages this link
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# can receive. As messages are received and credit is consumed, this
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# driver will 'top up' the credit back to max capacity. This number
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# should be large enough to avoid needlessly flow-controlling the
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# replies.
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self.capacity = 100 # TODO(kgiusti) guesstimate - make configurable
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self._credit = 0
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self._receiver.open()
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def ready(self):
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return self._ready
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def prepare_for_response(self, request, reply_queue):
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"""Apply a unique message identifier to this request message. This will
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be used to identify messages sent in reply. The identifier is placed
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in the 'id' field of the request message. It is expected that the
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identifier will appear in the 'correlation-id' field of the
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corresponding response message.
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"""
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request.id = uuid.uuid4().hex
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# reply is placed on reply_queue
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self._correlation[request.id] = reply_queue
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request.reply_to = self._receiver.source_address
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LOG.debug("Reply for msg id=%s expected on link %s",
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request.id, request.reply_to)
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# Pyngus ReceiverLink event callbacks:
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def receiver_active(self, receiver_link):
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"""This is a Pyngus callback, invoked by Pyngus when the receiver_link
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has transitioned to the open state and is able to receive incoming
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messages.
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"""
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self._ready = True
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self._update_credit()
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self._on_ready()
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LOG.debug("Replies expected on link %s",
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self._receiver.source_address)
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def receiver_remote_closed(self, receiver, pn_condition):
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"""This is a Pyngus callback, invoked by Pyngus when the peer of this
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receiver link has initiated closing the connection.
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"""
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# TODO(kgiusti) Unclear if this error will ever occur (as opposed to
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# the Connection failing instead). Log for now, possibly implement a
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# recovery strategy if necessary.
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LOG.error("Reply subscription closed by peer: %s",
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(pn_condition or "no error given"))
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def message_received(self, receiver, message, handle):
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"""This is a Pyngus callback, invoked by Pyngus when a new message
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arrives on this receiver link from the peer.
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"""
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self._credit = self._credit - 1
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self._update_credit()
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key = message.correlation_id
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if key in self._correlation:
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LOG.debug("Received response for msg id=%s", key)
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self._correlation[key].put(message)
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# cleanup (only need one response per request)
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del self._correlation[key]
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else:
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LOG.warn("Can't find receiver for response msg id=%s, dropping!",
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key)
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receiver.message_accepted(handle)
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def _update_credit(self):
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if self.capacity > self._credit:
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self._receiver.add_capacity(self.capacity - self._credit)
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self._credit = self.capacity
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class Server(pyngus.ReceiverEventHandler):
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"""A group of links that receive messages from a set of addresses derived
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from a given target. Messages arriving on the links are placed on the
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'incoming' queue.
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"""
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def __init__(self, addresses, incoming):
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self._incoming = incoming
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self._addresses = addresses
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def attach(self, connection):
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"""Create receiver links over the given connection for all the
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configured addresses.
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"""
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self._receivers = []
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for a in self._addresses:
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props = {"snd-settle-mode": "settled"}
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rname = "Consumer-%s:src=%s:tgt=%s" % (uuid.uuid4().hex, a, a)
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r = connection.create_receiver(source_address=a,
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target_address=a,
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event_handler=self,
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name=rname,
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properties=props)
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# TODO(kgiusti) Hardcoding credit here is sub-optimal. A better
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# approach would monitor for a back-up of inbound messages to be
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# processed by the consuming application and backpressure the
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# sender based on configured thresholds.
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r.add_capacity(500)
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r.open()
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self._receivers.append(r)
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# Pyngus ReceiverLink event callbacks:
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def receiver_remote_closed(self, receiver, pn_condition):
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"""This is a Pyngus callback, invoked by Pyngus when the peer of this
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receiver link has initiated closing the connection.
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"""
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text = "Server subscription %(addr)s closed by peer: %(err_msg)s"
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vals = {
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"addr": receiver.source_address or receiver.target_address,
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"err_msg": pn_condition or "no error given"
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}
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LOG.error(text % vals)
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def message_received(self, receiver, message, handle):
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"""This is a Pyngus callback, invoked by Pyngus when a new message
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arrives on this receiver link from the peer.
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"""
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# TODO(kgiusti) Sub-optimal to grant one credit each time a message
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# arrives. A better approach would grant batches of credit on demand.
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receiver.add_capacity(1)
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self._incoming.put(message)
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LOG.debug("message received: %s", message)
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receiver.message_accepted(handle)
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class Hosts(object):
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"""An order list of peer addresses. Connection failover progresses from
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one host to the next.
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"""
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HostnamePort = collections.namedtuple('HostnamePort',
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['hostname', 'port'])
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def __init__(self, entries=None):
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self._entries = [self.HostnamePort(h, p) for h, p in entries or []]
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self._current = 0
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def add(self, hostname, port=5672):
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self._entries.append(self.HostnamePort(hostname, port))
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@property
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def current(self):
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if len(self._entries):
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return self._entries[self._current]
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else:
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return self.HostnamePort("localhost", 5672)
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def next(self):
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if len(self._entries) > 1:
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self._current = (self._current + 1) % len(self._entries)
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return self.current
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def __repr__(self):
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return '<Hosts ' + str(self) + '>'
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def __str__(self):
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return ", ".join(["%s:%i" % e for e in self._entries])
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class Controller(pyngus.ConnectionEventHandler):
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"""Controls the connection to the AMQP messaging service. This object is
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the 'brains' of the driver. It maintains the logic for addressing, sending
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and receiving messages, and managing the connection. All messaging and I/O
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work is done on the Eventloop thread, allowing the driver to run
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asynchronously from the messaging clients.
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"""
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def __init__(self, hosts, default_exchange, config):
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self.processor = None
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# queue of Task() objects to execute on the eventloop once the
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# connection is ready:
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self._tasks = moves.queue.Queue(maxsize=500)
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# limit the number of Task()'s to execute per call to _process_tasks().
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# This allows the eventloop main thread to return to servicing socket
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# I/O in a timely manner
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self._max_task_batch = 50
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# cache of sending links indexed by address:
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self._senders = {}
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# Servers (set of receiving links), indexed by target:
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self._servers = {}
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self.hosts = Hosts(hosts)
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opt_group = cfg.OptGroup(name='amqp1',
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title='AMQP 1.0 options')
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config.register_group(opt_group)
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config.register_opts(_amqp1_opts, group=opt_group)
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self.server_request_prefix = config.amqp1.server_request_prefix
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self.broadcast_prefix = config.amqp1.broadcast_prefix
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self.group_request_prefix = config.amqp1.group_request_prefix
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self._container_name = config.amqp1.container_name
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if not self._container_name:
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self._container_name = "container-%s" % uuid.uuid4().hex
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self.idle_timeout = config.amqp1.idle_timeout
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self.trace_protocol = config.amqp1.trace
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self.ssl_ca_file = config.amqp1.ssl_ca_file
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self.ssl_cert_file = config.amqp1.ssl_cert_file
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self.ssl_key_file = config.amqp1.ssl_key_file
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self.ssl_key_password = config.amqp1.ssl_key_password
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self.ssl_allow_insecure = config.amqp1.allow_insecure_clients
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self.separator = "."
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self.fanout_qualifier = "all"
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self.default_exchange = default_exchange
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# can't handle a request until the replies link is active, as
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# we need the peer assigned address, so need to delay any
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# processing of task queue until this is done
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self._replies = None
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# Set True when the driver is shutting down
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self._closing = False
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# only schedule one outstanding reconnect attempt at a time
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self._reconnecting = False
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self._delay = 0 # seconds between retries
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# prevent queuing up multiple requests to run _process_tasks()
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self._process_tasks_scheduled = False
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self._process_tasks_lock = threading.Lock()
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def connect(self):
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"""Connect to the messaging service."""
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self.processor = eventloop.Thread(self._container_name)
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self.processor.wakeup(lambda: self._do_connect())
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def add_task(self, task):
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"""Add a Task for execution on processor thread."""
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self._tasks.put(task)
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self._schedule_task_processing()
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def destroy(self):
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"""Shutdown the messaging service."""
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if self.processor:
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self.processor.wakeup(lambda: self._start_shutdown())
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LOG.info("Waiting for eventloop to exit")
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self.processor.join()
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self.processor = None
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LOG.info("Eventloop exited, driver shut down")
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# The remaining methods are reserved to run from the eventloop thread only!
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# They must not be invoked directly!
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# methods executed by Tasks created by the driver:
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def request(self, target, request, reply_queue=None):
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"""Send a request message to the given target, and arrange for a
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response to be put on the optional reply_queue if specified
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"""
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address = self._resolve(target)
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LOG.debug("Sending request for %s to %s", target, address)
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if reply_queue is not None:
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self._replies.prepare_for_response(request, reply_queue)
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self._send(address, request)
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def response(self, address, response):
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LOG.debug("Sending response to %s", address)
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self._send(address, response)
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def subscribe(self, target, in_queue):
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"""Subscribe to messages sent to 'target', place received messages on
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'in_queue'.
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"""
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addresses = [
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self._server_address(target),
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self._broadcast_address(target),
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self._group_request_address(target)
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]
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self._subscribe(target, addresses, in_queue)
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def subscribe_notifications(self, target, in_queue):
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"""Subscribe for notifications on 'target', place received messages on
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'in_queue'.
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"""
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addresses = [self._group_request_address(target)]
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self._subscribe(target, addresses, in_queue)
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def _subscribe(self, target, addresses, in_queue):
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LOG.debug("Subscribing to %s (%s)", target, addresses)
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self._servers[target] = Server(addresses, in_queue)
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self._servers[target].attach(self._socket_connection.connection)
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def _resolve(self, target):
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"""Return a link address for a given target."""
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if target.server:
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return self._server_address(target)
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elif target.fanout:
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return self._broadcast_address(target)
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else:
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return self._group_request_address(target)
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def _sender(self, address):
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# if we already have a sender for that address, use it
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# else establish the sender and cache it
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if address in self._senders:
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sender = self._senders[address]
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else:
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sname = "Producer-%s:src=%s:tgt=%s" % (uuid.uuid4().hex,
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address, address)
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conn = self._socket_connection.connection
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sender = conn.create_sender(source_address=address,
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target_address=address,
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name=sname)
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sender.open()
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self._senders[address] = sender
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return sender
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def _send(self, addr, message):
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"""Send the message out the link addressed by 'addr'."""
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address = str(addr)
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message.address = address
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self._sender(address).send(message)
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def _server_address(self, target):
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return self._concatenate([self.server_request_prefix,
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target.exchange or self.default_exchange,
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target.topic, target.server])
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def _broadcast_address(self, target):
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return self._concatenate([self.broadcast_prefix,
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target.exchange or self.default_exchange,
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target.topic, self.fanout_qualifier])
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def _group_request_address(self, target):
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return self._concatenate([self.group_request_prefix,
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target.exchange or self.default_exchange,
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target.topic])
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def _concatenate(self, items):
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return self.separator.join(filter(bool, items))
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# commands executed on the processor (eventloop) via 'wakeup()':
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def _do_connect(self):
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"""Establish connection and reply subscription on processor thread."""
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hostname = self.hosts.current.hostname
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port = self.hosts.current.port
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conn_props = {}
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if self.idle_timeout:
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conn_props["idle-time-out"] = float(self.idle_timeout)
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if self.trace_protocol:
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conn_props["x-trace-protocol"] = self.trace_protocol
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if self.ssl_ca_file:
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conn_props["x-ssl-ca-file"] = self.ssl_ca_file
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if self.ssl_cert_file:
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# assume this connection is for a server. If client authentication
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# support is developed, we'll need an explict flag (server or
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# client)
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conn_props["x-ssl-server"] = True
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conn_props["x-ssl-identity"] = (self.ssl_cert_file,
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self.ssl_key_file,
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self.ssl_key_password)
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conn_props["x-ssl-allow-cleartext"] = self.ssl_allow_insecure
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self._socket_connection = self.processor.connect(hostname, port,
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handler=self,
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properties=conn_props)
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LOG.debug("Connection initiated")
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def _process_tasks(self):
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"""Execute Task objects in the context of the processor thread."""
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with self._process_tasks_lock:
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self._process_tasks_scheduled = False
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count = 0
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while (not self._tasks.empty() and
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count < self._max_task_batch and
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self._can_process_tasks):
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try:
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self._tasks.get(False).execute(self)
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except Exception as e:
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LOG.exception("Error processing task: %s", e)
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count += 1
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# if we hit _max_task_batch, resume task processing later:
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if not self._tasks.empty() and self._can_process_tasks:
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self._schedule_task_processing()
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def _schedule_task_processing(self):
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"""_process_tasks() helper: prevent queuing up multiple requests for
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task processing. This method is called both by the application thread
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and the processing thread.
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"""
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if self.processor:
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with self._process_tasks_lock:
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already_scheduled = self._process_tasks_scheduled
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self._process_tasks_scheduled = True
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if not already_scheduled:
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self.processor.wakeup(lambda: self._process_tasks())
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@property
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def _can_process_tasks(self):
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"""_process_tasks helper(): indicates that the driver is ready to
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process Tasks. In order to process messaging-related tasks, the reply
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queue link must be active.
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"""
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return (not self._closing and
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self._replies and self._replies.ready())
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def _start_shutdown(self):
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"""Called when the driver destroys the controller, this method attempts
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to cleanly close the AMQP connection to the peer.
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"""
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LOG.info("Shutting down AMQP connection")
|
|
self._closing = True
|
|
if self._socket_connection.connection.active:
|
|
# try a clean shutdown
|
|
self._socket_connection.connection.close()
|
|
else:
|
|
# don't wait for a close from the remote, may never happen
|
|
self._complete_shutdown()
|
|
|
|
# reply link active callback:
|
|
|
|
def _reply_link_ready(self):
|
|
"""Invoked when the Replies reply link has become active. At this
|
|
point, we are ready to send/receive messages (via Task processing).
|
|
"""
|
|
LOG.info("Messaging is active (%s:%i)", self.hosts.current.hostname,
|
|
self.hosts.current.port)
|
|
self._schedule_task_processing()
|
|
|
|
# callback from eventloop on socket error
|
|
|
|
def socket_error(self, error):
|
|
"""Called by eventloop when a socket error occurs."""
|
|
LOG.debug("Socket failure: %s", error)
|
|
self._handle_connection_loss()
|
|
|
|
# Pyngus connection event callbacks (and their helpers), all invoked from
|
|
# the eventloop thread:
|
|
|
|
def connection_failed(self, connection, error):
|
|
"""This is a Pyngus callback, invoked by Pyngus when a non-recoverable
|
|
error occurs on the connection.
|
|
"""
|
|
if connection is not self._socket_connection.connection:
|
|
# pyngus bug: ignore failure callback on destroyed connections
|
|
return
|
|
LOG.debug("AMQP Connection failure: %s", error)
|
|
self._handle_connection_loss()
|
|
|
|
def connection_active(self, connection):
|
|
"""This is a Pyngus callback, invoked by Pyngus when the connection to
|
|
the peer is up. At this point, the driver will activate all subscriber
|
|
links (server) and the reply link.
|
|
"""
|
|
LOG.debug("Connection active (%s:%i), subscribing...",
|
|
self.hosts.current.hostname, self.hosts.current.port)
|
|
for s in self._servers.itervalues():
|
|
s.attach(self._socket_connection.connection)
|
|
self._replies = Replies(self._socket_connection.connection,
|
|
lambda: self._reply_link_ready())
|
|
self._delay = 0
|
|
|
|
def connection_closed(self, connection):
|
|
"""This is a Pyngus callback, invoked by Pyngus when the connection has
|
|
cleanly closed. This occurs after the driver closes the connection
|
|
locally, and the peer has acknowledged the close. At this point, the
|
|
shutdown of the driver's connection is complete.
|
|
"""
|
|
LOG.debug("AMQP connection closed.")
|
|
# if the driver isn't being shutdown, failover and reconnect
|
|
self._handle_connection_loss()
|
|
|
|
def connection_remote_closed(self, connection, reason):
|
|
"""This is a Pyngus callback, invoked by Pyngus when the peer has
|
|
requested that the connection be closed.
|
|
"""
|
|
if not self._closing:
|
|
# The messaging service/broker is trying to shut down the
|
|
# connection. Acknowledge the close, and try to reconnect/failover
|
|
# later once the connection has closed (connection_closed is
|
|
# called).
|
|
LOG.info("Connection closed by peer: %s",
|
|
reason or "no reason given")
|
|
self._socket_connection.connection.close()
|
|
|
|
def _complete_shutdown(self):
|
|
"""The AMQP Connection has closed, and the driver shutdown is complete.
|
|
Clean up controller resources and exit.
|
|
"""
|
|
self._socket_connection.close()
|
|
self.processor.shutdown()
|
|
LOG.info("Messaging has shutdown")
|
|
|
|
def _handle_connection_loss(self):
|
|
"""The connection to the messaging service has been lost. Try to
|
|
reestablish the connection/failover.
|
|
"""
|
|
if self._closing:
|
|
# we're in the middle of shutting down the driver anyways,
|
|
# just consider it done:
|
|
self._complete_shutdown()
|
|
else:
|
|
# for some reason, we've lost the connection to the messaging
|
|
# service. Try to re-establish the connection:
|
|
if not self._reconnecting:
|
|
self._reconnecting = True
|
|
self._replies = None
|
|
if self._delay == 0:
|
|
self._delay = 1
|
|
self._do_reconnect()
|
|
else:
|
|
d = self._delay
|
|
LOG.info("delaying reconnect attempt for %d seconds", d)
|
|
self.processor.schedule(lambda: self._do_reconnect(), d)
|
|
self._delay = min(d * 2, 60)
|
|
|
|
def _do_reconnect(self):
|
|
"""Invoked on connection/socket failure, failover and re-connect to the
|
|
messaging service.
|
|
"""
|
|
if not self._closing:
|
|
self._reconnecting = False
|
|
self._senders = {}
|
|
self._socket_connection.reset()
|
|
hostname, port = self.hosts.next()
|
|
LOG.info("Reconnecting to: %s:%i", hostname, port)
|
|
self._socket_connection.connect(hostname, port)
|