/usr/lib/python2.7/dist-packages/oslo_messaging/_drivers/pika_driver/pika_engine.py is in python-oslo.messaging 5.10.0-2.
This file is owned by root:root, with mode 0o644.
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#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
import logging
import os
import threading
import uuid
from oslo_utils import eventletutils
import pika_pool
from stevedore import driver
from oslo_messaging._drivers import common as drv_cmn
from oslo_messaging._drivers.pika_driver import pika_commons as pika_drv_cmns
from oslo_messaging._drivers.pika_driver import pika_exceptions as pika_drv_exc
LOG = logging.getLogger(__name__)
class _PooledConnectionWithConfirmations(pika_pool.Connection):
"""Derived from 'pika_pool.Connection' and extends its logic - adds
'confirm_delivery' call after channel creation to enable delivery
confirmation for channel
"""
@property
def channel(self):
if self.fairy.channel is None:
self.fairy.channel = self.fairy.cxn.channel()
self.fairy.channel.confirm_delivery()
return self.fairy.channel
class PikaEngine(object):
"""Used for shared functionality between other pika driver modules, like
connection factory, connection pools, processing and holding configuration,
etc.
"""
def __init__(self, conf, url, default_exchange=None,
allowed_remote_exmods=None):
conf = drv_cmn.ConfigOptsProxy(conf, url)
self.conf = conf
self.url = url
self._connection_factory_type = (
self.conf.oslo_messaging_pika.connection_factory
)
self._connection_factory = None
self._connection_without_confirmation_pool = None
self._connection_with_confirmation_pool = None
self._pid = None
self._init_lock = threading.Lock()
self.host_connection_reconnect_delay = (
conf.oslo_messaging_pika.host_connection_reconnect_delay
)
# processing rpc options
self.default_rpc_exchange = (
conf.oslo_messaging_pika.default_rpc_exchange
)
self.rpc_reply_exchange = (
conf.oslo_messaging_pika.rpc_reply_exchange
)
self.allowed_remote_exmods = [pika_drv_cmns.EXCEPTIONS_MODULE]
if allowed_remote_exmods:
self.allowed_remote_exmods.extend(allowed_remote_exmods)
self.rpc_listener_prefetch_count = (
conf.oslo_messaging_pika.rpc_listener_prefetch_count
)
self.default_rpc_retry_attempts = (
conf.oslo_messaging_pika.default_rpc_retry_attempts
)
self.rpc_retry_delay = (
conf.oslo_messaging_pika.rpc_retry_delay
)
if self.rpc_retry_delay < 0:
raise ValueError("rpc_retry_delay should be non-negative integer")
self.rpc_reply_listener_prefetch_count = (
conf.oslo_messaging_pika.rpc_listener_prefetch_count
)
self.rpc_reply_retry_attempts = (
conf.oslo_messaging_pika.rpc_reply_retry_attempts
)
self.rpc_reply_retry_delay = (
conf.oslo_messaging_pika.rpc_reply_retry_delay
)
if self.rpc_reply_retry_delay < 0:
raise ValueError("rpc_reply_retry_delay should be non-negative "
"integer")
self.rpc_queue_expiration = (
self.conf.oslo_messaging_pika.rpc_queue_expiration
)
# processing notification options
self.default_notification_exchange = (
conf.oslo_messaging_pika.default_notification_exchange
)
self.notification_persistence = (
conf.oslo_messaging_pika.notification_persistence
)
self.notification_listener_prefetch_count = (
conf.oslo_messaging_pika.notification_listener_prefetch_count
)
self.default_notification_retry_attempts = (
conf.oslo_messaging_pika.default_notification_retry_attempts
)
if self.default_notification_retry_attempts is None:
raise ValueError("default_notification_retry_attempts should be "
"an integer")
self.notification_retry_delay = (
conf.oslo_messaging_pika.notification_retry_delay
)
if (self.notification_retry_delay is None or
self.notification_retry_delay < 0):
raise ValueError("notification_retry_delay should be non-negative "
"integer")
def _init_if_needed(self):
cur_pid = os.getpid()
if self._pid == cur_pid:
return
with self._init_lock:
if self._pid == cur_pid:
return
if self._pid:
LOG.warning("New pid is detected. Old: %s, new: %s. "
"Cleaning up...", self._pid, cur_pid)
# Note(dukhlov): we need to force select poller usage in case
# when 'thread' module is monkey patched becase current
# eventlet implementation does not support patching of
# poll/epoll/kqueue
if eventletutils.is_monkey_patched("thread"):
from pika.adapters import select_connection
select_connection.SELECT_TYPE = "select"
mgr = driver.DriverManager(
'oslo.messaging.pika.connection_factory',
self._connection_factory_type
)
self._connection_factory = mgr.driver(self.url, self.conf)
# initializing 2 connection pools: 1st for connections without
# confirmations, 2nd - with confirmations
self._connection_without_confirmation_pool = pika_pool.QueuedPool(
create=self.create_connection,
max_size=self.conf.oslo_messaging_pika.pool_max_size,
max_overflow=self.conf.oslo_messaging_pika.pool_max_overflow,
timeout=self.conf.oslo_messaging_pika.pool_timeout,
recycle=self.conf.oslo_messaging_pika.pool_recycle,
stale=self.conf.oslo_messaging_pika.pool_stale,
)
self._connection_with_confirmation_pool = pika_pool.QueuedPool(
create=self.create_connection,
max_size=self.conf.oslo_messaging_pika.pool_max_size,
max_overflow=self.conf.oslo_messaging_pika.pool_max_overflow,
timeout=self.conf.oslo_messaging_pika.pool_timeout,
recycle=self.conf.oslo_messaging_pika.pool_recycle,
stale=self.conf.oslo_messaging_pika.pool_stale,
)
self._connection_with_confirmation_pool.Connection = (
_PooledConnectionWithConfirmations
)
self._pid = cur_pid
def create_connection(self, for_listening=False):
self._init_if_needed()
return self._connection_factory.create_connection(for_listening)
@property
def connection_without_confirmation_pool(self):
self._init_if_needed()
return self._connection_without_confirmation_pool
@property
def connection_with_confirmation_pool(self):
self._init_if_needed()
return self._connection_with_confirmation_pool
def cleanup(self):
if self._connection_factory:
self._connection_factory.cleanup()
def declare_exchange_by_channel(self, channel, exchange, exchange_type,
durable):
"""Declare exchange using already created channel, if they don't exist
:param channel: Channel for communication with RabbitMQ
:param exchange: String, RabbitMQ exchange name
:param exchange_type: String ('direct', 'topic' or 'fanout')
exchange type for exchange to be declared
:param durable: Boolean, creates durable exchange if true
"""
try:
channel.exchange_declare(
exchange, exchange_type, auto_delete=True, durable=durable
)
except pika_drv_cmns.PIKA_CONNECTIVITY_ERRORS as e:
raise pika_drv_exc.ConnectionException(
"Connectivity problem detected during declaring exchange: "
"exchange:{}, exchange_type: {}, durable: {}. {}".format(
exchange, exchange_type, durable, str(e)
)
)
def declare_queue_binding_by_channel(self, channel, exchange, queue,
routing_key, exchange_type,
queue_expiration, durable):
"""Declare exchange, queue and bind them using already created
channel, if they don't exist
:param channel: Channel for communication with RabbitMQ
:param exchange: String, RabbitMQ exchange name
:param queue: Sting, RabbitMQ queue name
:param routing_key: Sting, RabbitMQ routing key for queue binding
:param exchange_type: String ('direct', 'topic' or 'fanout')
exchange type for exchange to be declared
:param queue_expiration: Integer, time in seconds which queue will
remain existing in RabbitMQ when there no consumers connected
:param durable: Boolean, creates durable exchange and queue if true
"""
try:
channel.exchange_declare(
exchange, exchange_type, auto_delete=True, durable=durable
)
arguments = {}
if queue_expiration > 0:
arguments['x-expires'] = queue_expiration * 1000
channel.queue_declare(queue, durable=durable, arguments=arguments)
channel.queue_bind(queue, exchange, routing_key)
except pika_drv_cmns.PIKA_CONNECTIVITY_ERRORS as e:
raise pika_drv_exc.ConnectionException(
"Connectivity problem detected during declaring queue "
"binding: exchange:{}, queue: {}, routing_key: {}, "
"exchange_type: {}, queue_expiration: {}, "
"durable: {}. {}".format(
exchange, queue, routing_key, exchange_type,
queue_expiration, durable, str(e)
)
)
def get_rpc_exchange_name(self, exchange):
"""Returns RabbitMQ exchange name for given rpc request
:param exchange: String, oslo.messaging target's exchange
:return: String, RabbitMQ exchange name
"""
return exchange or self.default_rpc_exchange
@staticmethod
def get_rpc_queue_name(topic, server, no_ack, worker=False):
"""Returns RabbitMQ queue name for given rpc request
:param topic: String, oslo.messaging target's topic
:param server: String, oslo.messaging target's server
:param no_ack: Boolean, use message delivery with acknowledges or not
:param worker: Boolean, use queue by single worker only or not
:return: String, RabbitMQ queue name
"""
queue_parts = ["no_ack" if no_ack else "with_ack", topic]
if server is not None:
queue_parts.append(server)
if worker:
queue_parts.append("worker")
queue_parts.append(uuid.uuid4().hex)
queue = '.'.join(queue_parts)
return queue
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