1cc3b9c80e
In previous implementation PikaPoller returned by PikaDriver.listen is not connected to RabbitMQ. Connection is established only when executor calls first poll method This behaviour is different in comparison with kombu driver and causes neutron rpc workers hanging. I tried to fix it there: https://review.openstack.org/#/c/270832/ But oslo.service team don't accept this workaround The main problem is that neutron uses olso libraries in wrong way and it is necessary to change it in neutron. This patch only mask this problem Change-Id: Idd6b692bcf2025fc2a3b37b27f4d1c1b01922fdf
433 lines
16 KiB
Python
433 lines
16 KiB
Python
# Copyright 2015 Mirantis, 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 random
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import socket
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import sys
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import threading
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import time
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from oslo_log import log as logging
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import pika
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from pika.adapters import select_connection
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from pika import credentials as pika_credentials
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import pika_pool
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import six
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from oslo_messaging._drivers.pika_driver import pika_exceptions as pika_drv_exc
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LOG = logging.getLogger(__name__)
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_EXCEPTIONS_MODULE = 'exceptions' if six.PY2 else 'builtins'
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def _is_eventlet_monkey_patched(module):
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"""Determines safely is eventlet patching for module enabled or not
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:param module: String, module name
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:return Bool, True if module is pathed, False otherwise
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"""
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if 'eventlet.patcher' not in sys.modules:
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return False
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import eventlet.patcher
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return eventlet.patcher.is_monkey_patched(module)
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def _create_select_poller_connection_impl(
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parameters, on_open_callback, on_open_error_callback,
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on_close_callback, stop_ioloop_on_close):
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"""Used for disabling autochoise of poller ('select', 'poll', 'epool', etc)
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inside default 'SelectConnection.__init__(...)' logic. It is necessary to
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force 'select' poller usage if eventlet is monkeypatched because eventlet
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patches only 'select' system call
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Method signature is copied form 'SelectConnection.__init__(...)', because
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it is used as replacement of 'SelectConnection' class to create instances
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"""
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return select_connection.SelectConnection(
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parameters=parameters,
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on_open_callback=on_open_callback,
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on_open_error_callback=on_open_error_callback,
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on_close_callback=on_close_callback,
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stop_ioloop_on_close=stop_ioloop_on_close,
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custom_ioloop=select_connection.SelectPoller()
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)
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class _PooledConnectionWithConfirmations(pika_pool.Connection):
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"""Derived from 'pika_pool.Connection' and extends its logic - adds
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'confirm_delivery' call after channel creation to enable delivery
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confirmation for channel
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"""
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@property
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def channel(self):
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if self.fairy.channel is None:
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self.fairy.channel = self.fairy.cxn.channel()
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self.fairy.channel.confirm_delivery()
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return self.fairy.channel
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class PikaEngine(object):
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"""Used for shared functionality between other pika driver modules, like
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connection factory, connection pools, processing and holding configuration,
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etc.
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"""
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# constants for creating connection statistics
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HOST_CONNECTION_LAST_TRY_TIME = "last_try_time"
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HOST_CONNECTION_LAST_SUCCESS_TRY_TIME = "last_success_try_time"
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# constant for setting tcp_user_timeout socket option
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# (it should be defined in 'select' module of standard library in future)
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TCP_USER_TIMEOUT = 18
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def __init__(self, conf, url, default_exchange=None,
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allowed_remote_exmods=None):
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self.conf = conf
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self._force_select_poller_use = _is_eventlet_monkey_patched('select')
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# processing rpc options
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self.default_rpc_exchange = (
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conf.oslo_messaging_pika.default_rpc_exchange
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)
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self.rpc_reply_exchange = (
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conf.oslo_messaging_pika.rpc_reply_exchange
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)
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self.allowed_remote_exmods = [_EXCEPTIONS_MODULE]
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if allowed_remote_exmods:
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self.allowed_remote_exmods.extend(allowed_remote_exmods)
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self.rpc_listener_prefetch_count = (
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conf.oslo_messaging_pika.rpc_listener_prefetch_count
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)
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self.default_rpc_retry_attempts = (
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conf.oslo_messaging_pika.default_rpc_retry_attempts
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)
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self.rpc_retry_delay = (
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conf.oslo_messaging_pika.rpc_retry_delay
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)
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if self.rpc_retry_delay < 0:
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raise ValueError("rpc_retry_delay should be non-negative integer")
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self.rpc_reply_listener_prefetch_count = (
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conf.oslo_messaging_pika.rpc_listener_prefetch_count
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)
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self.rpc_reply_retry_attempts = (
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conf.oslo_messaging_pika.rpc_reply_retry_attempts
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)
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self.rpc_reply_retry_delay = (
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conf.oslo_messaging_pika.rpc_reply_retry_delay
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)
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if self.rpc_reply_retry_delay < 0:
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raise ValueError("rpc_reply_retry_delay should be non-negative "
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"integer")
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self.rpc_queue_expiration = (
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self.conf.oslo_messaging_pika.rpc_queue_expiration
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)
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# processing notification options
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self.default_notification_exchange = (
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conf.oslo_messaging_pika.default_notification_exchange
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)
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self.notification_persistence = (
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conf.oslo_messaging_pika.notification_persistence
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)
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self.notification_listener_prefetch_count = (
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conf.oslo_messaging_pika.notification_listener_prefetch_count
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)
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self.default_notification_retry_attempts = (
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conf.oslo_messaging_pika.default_notification_retry_attempts
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)
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if self.default_notification_retry_attempts is None:
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raise ValueError("default_notification_retry_attempts should be "
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"an integer")
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self.notification_retry_delay = (
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conf.oslo_messaging_pika.notification_retry_delay
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)
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if (self.notification_retry_delay is None or
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self.notification_retry_delay < 0):
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raise ValueError("notification_retry_delay should be non-negative "
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"integer")
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self._tcp_user_timeout = self.conf.oslo_messaging_pika.tcp_user_timeout
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self.host_connection_reconnect_delay = (
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self.conf.oslo_messaging_pika.host_connection_reconnect_delay
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)
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self._heartbeat_interval = (
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self.conf.oslo_messaging_pika.heartbeat_interval
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)
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# initializing connection parameters for configured RabbitMQ hosts
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common_pika_params = {
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'virtual_host': url.virtual_host,
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'channel_max': self.conf.oslo_messaging_pika.channel_max,
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'frame_max': self.conf.oslo_messaging_pika.frame_max,
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'ssl': self.conf.oslo_messaging_pika.ssl,
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'ssl_options': self.conf.oslo_messaging_pika.ssl_options,
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'socket_timeout': self.conf.oslo_messaging_pika.socket_timeout,
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}
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self._connection_lock = threading.Lock()
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self._connection_host_param_list = []
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self._connection_host_status_list = []
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if not url.hosts:
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raise ValueError("You should provide at least one RabbitMQ host")
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for transport_host in url.hosts:
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pika_params = common_pika_params.copy()
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pika_params.update(
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host=transport_host.hostname,
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port=transport_host.port,
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credentials=pika_credentials.PlainCredentials(
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transport_host.username, transport_host.password
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),
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)
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self._connection_host_param_list.append(pika_params)
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self._connection_host_status_list.append({
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self.HOST_CONNECTION_LAST_TRY_TIME: 0,
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self.HOST_CONNECTION_LAST_SUCCESS_TRY_TIME: 0
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})
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self._next_connection_host_num = random.randint(
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0, len(self._connection_host_param_list) - 1
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)
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# initializing 2 connection pools: 1st for connections without
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# confirmations, 2nd - with confirmations
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self.connection_without_confirmation_pool = pika_pool.QueuedPool(
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create=self.create_connection,
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max_size=self.conf.oslo_messaging_pika.pool_max_size,
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max_overflow=self.conf.oslo_messaging_pika.pool_max_overflow,
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timeout=self.conf.oslo_messaging_pika.pool_timeout,
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recycle=self.conf.oslo_messaging_pika.pool_recycle,
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stale=self.conf.oslo_messaging_pika.pool_stale,
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)
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self.connection_with_confirmation_pool = pika_pool.QueuedPool(
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create=self.create_connection,
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max_size=self.conf.oslo_messaging_pika.pool_max_size,
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max_overflow=self.conf.oslo_messaging_pika.pool_max_overflow,
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timeout=self.conf.oslo_messaging_pika.pool_timeout,
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recycle=self.conf.oslo_messaging_pika.pool_recycle,
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stale=self.conf.oslo_messaging_pika.pool_stale,
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)
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self.connection_with_confirmation_pool.Connection = (
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_PooledConnectionWithConfirmations
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)
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def _next_connection_num(self):
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"""Used for creating connections to different RabbitMQ nodes in
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round robin order
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:return: next host number to create connection to
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"""
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with self._connection_lock:
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cur_num = self._next_connection_host_num
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self._next_connection_host_num += 1
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self._next_connection_host_num %= len(
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self._connection_host_param_list
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)
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return cur_num
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def create_connection(self, for_listening=False):
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"""Create and return connection to any available host.
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:return: created connection
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:raise: ConnectionException if all hosts are not reachable
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"""
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host_count = len(self._connection_host_param_list)
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connection_attempts = host_count
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pika_next_connection_num = self._next_connection_num()
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while connection_attempts > 0:
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try:
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return self.create_host_connection(
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pika_next_connection_num, for_listening
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)
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except pika_pool.Connection.connectivity_errors as e:
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LOG.warn(str(e))
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except pika_drv_exc.HostConnectionNotAllowedException as e:
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LOG.warn(str(e))
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connection_attempts -= 1
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pika_next_connection_num += 1
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pika_next_connection_num %= host_count
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raise pika_drv_exc.EstablishConnectionException(
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"Can not establish connection to any configured RabbitMQ host: " +
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str(self._connection_host_param_list)
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)
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def _set_tcp_user_timeout(self, s):
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if not self._tcp_user_timeout:
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return
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try:
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s.setsockopt(
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socket.IPPROTO_TCP, self.TCP_USER_TIMEOUT,
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int(self._tcp_user_timeout * 1000)
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)
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except socket.error:
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LOG.warn(
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"Whoops, this kernel doesn't seem to support TCP_USER_TIMEOUT."
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)
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def create_host_connection(self, host_index, for_listening=False):
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"""Create new connection to host #host_index
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:param host_index: Integer, number of host for connection establishing
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:param for_listening: Boolean, creates connection for listening
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(enable heartbeats) if True
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:return: New connection
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"""
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connection_params = pika.ConnectionParameters(
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heartbeat_interval=(
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self._heartbeat_interval if for_listening else None
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),
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**self._connection_host_param_list[host_index]
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)
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with self._connection_lock:
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cur_time = time.time()
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last_success_time = self._connection_host_status_list[host_index][
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self.HOST_CONNECTION_LAST_SUCCESS_TRY_TIME
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]
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last_time = self._connection_host_status_list[host_index][
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self.HOST_CONNECTION_LAST_TRY_TIME
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]
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# raise HostConnectionNotAllowedException if we tried to establish
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# connection in last 'host_connection_reconnect_delay' and got
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# failure
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if (last_time != last_success_time and
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cur_time - last_time <
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self.host_connection_reconnect_delay):
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raise pika_drv_exc.HostConnectionNotAllowedException(
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"Connection to host #{} is not allowed now because of "
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"previous failure".format(host_index)
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)
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try:
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connection = pika.BlockingConnection(
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parameters=connection_params,
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_impl_class=(_create_select_poller_connection_impl
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if self._force_select_poller_use else None)
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)
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# It is needed for pika_pool library which expects that
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# connections has params attribute defined in BaseConnection
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# but BlockingConnection is not derived from BaseConnection
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# and doesn't have it
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connection.params = connection_params
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self._set_tcp_user_timeout(connection._impl.socket)
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self._connection_host_status_list[host_index][
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self.HOST_CONNECTION_LAST_SUCCESS_TRY_TIME
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] = cur_time
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return connection
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finally:
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self._connection_host_status_list[host_index][
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self.HOST_CONNECTION_LAST_TRY_TIME
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] = cur_time
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@staticmethod
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def declare_queue_binding_by_channel(channel, exchange, queue, routing_key,
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exchange_type, queue_expiration,
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durable):
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"""Declare exchange, queue and bind them using already created
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channel, if they don't exist
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:param channel: Channel for communication with RabbitMQ
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:param exchange: String, RabbitMQ exchange name
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:param queue: Sting, RabbitMQ queue name
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:param routing_key: Sting, RabbitMQ routing key for queue binding
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:param exchange_type: String ('direct', 'topic' or 'fanout')
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exchange type for exchange to be declared
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:param queue_expiration: Integer, time in seconds which queue will
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remain existing in RabbitMQ when there no consumers connected
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:param durable: Boolean, creates durable exchange and queue if true
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"""
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try:
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channel.exchange_declare(
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exchange, exchange_type, auto_delete=True, durable=durable
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)
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arguments = {}
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if queue_expiration > 0:
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arguments['x-expires'] = queue_expiration * 1000
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channel.queue_declare(queue, durable=durable, arguments=arguments)
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channel.queue_bind(queue, exchange, routing_key)
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except pika_pool.Connection.connectivity_errors as e:
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raise pika_drv_exc.ConnectionException(
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"Connectivity problem detected during declaring queue "
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"binding: exchange:{}, queue: {}, routing_key: {}, "
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"exchange_type: {}, queue_expiration: {}, "
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"durable: {}. {}".format(
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exchange, queue, routing_key, exchange_type,
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queue_expiration, durable, str(e)
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)
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)
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def get_rpc_exchange_name(self, exchange, topic, fanout, no_ack):
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"""Returns RabbitMQ exchange name for given rpc request
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:param exchange: String, oslo.messaging target's exchange
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:param topic: String, oslo.messaging target's topic
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:param fanout: Boolean, oslo.messaging target's fanout mode
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:param no_ack: Boolean, use message delivery with acknowledges or not
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:return: String, RabbitMQ exchange name
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"""
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exchange = (exchange or self.default_rpc_exchange)
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if fanout:
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exchange = '{}_fanout_{}_{}'.format(
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exchange, "no_ack" if no_ack else "with_ack", topic
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)
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return exchange
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@staticmethod
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def get_rpc_queue_name(topic, server, no_ack):
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"""Returns RabbitMQ queue name for given rpc request
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:param topic: String, oslo.messaging target's topic
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:param server: String, oslo.messaging target's server
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:param no_ack: Boolean, use message delivery with acknowledges or not
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:return: String, RabbitMQ exchange name
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"""
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queue_parts = ["no_ack" if no_ack else "with_ack", topic]
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if server is not None:
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queue_parts.append(server)
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queue = '.'.join(queue_parts)
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return queue
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