270 lines
8.6 KiB
Python
270 lines
8.6 KiB
Python
# Copyright 2015 - Mirantis, Inc.
|
|
#
|
|
# 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 amqp
|
|
import socket
|
|
import threading
|
|
import time
|
|
|
|
import kombu
|
|
from oslo_config import cfg
|
|
from oslo_log import log as logging
|
|
import oslo_messaging as messaging
|
|
from stevedore import driver
|
|
|
|
from mistral import context as auth_ctx
|
|
from mistral import exceptions as exc
|
|
from mistral.rpc import base as rpc_base
|
|
from mistral.rpc.kombu import base as kombu_base
|
|
from mistral.rpc.kombu import kombu_hosts
|
|
|
|
|
|
LOG = logging.getLogger(__name__)
|
|
CONF = cfg.CONF
|
|
_pool_opts = [
|
|
cfg.IntOpt('executor_thread_pool_size',
|
|
default=64,
|
|
deprecated_name="rpc_thread_pool_size",
|
|
help='Size of executor thread pool when'
|
|
' executor is threading or eventlet.'),
|
|
]
|
|
|
|
|
|
class KombuRPCServer(rpc_base.RPCServer, kombu_base.Base):
|
|
def __init__(self, conf):
|
|
super(KombuRPCServer, self).__init__(conf)
|
|
|
|
self._register_mistral_serialization()
|
|
CONF.register_opts(_pool_opts)
|
|
|
|
self._transport_url = messaging.TransportURL.parse(
|
|
CONF,
|
|
CONF.transport_url
|
|
)
|
|
self._check_backend()
|
|
|
|
self.topic = conf.topic
|
|
self.server_id = conf.host
|
|
|
|
self._hosts = kombu_hosts.KombuHosts(CONF)
|
|
|
|
self._executor_threads = CONF.executor_thread_pool_size
|
|
self.exchange = CONF.control_exchange
|
|
self.virtual_host = CONF.oslo_messaging_rabbit.rabbit_virtual_host
|
|
self.durable_queue = CONF.oslo_messaging_rabbit.amqp_durable_queues
|
|
self.auto_delete = CONF.oslo_messaging_rabbit.amqp_auto_delete
|
|
self.routing_key = self.topic
|
|
self.channel = None
|
|
self.conn = None
|
|
self._running = threading.Event()
|
|
self._stopped = threading.Event()
|
|
self.endpoints = []
|
|
self._worker = None
|
|
|
|
# TODO(ddeja): Those 2 options should be gathered from config.
|
|
self._sleep_time = 1
|
|
self._max_sleep_time = 512
|
|
|
|
@property
|
|
def is_running(self):
|
|
"""Return whether server is running."""
|
|
return self._running.is_set()
|
|
|
|
def run(self, executor='blocking'):
|
|
"""Start the server."""
|
|
self._prepare_worker(executor)
|
|
|
|
while True:
|
|
try:
|
|
_retry_connection = False
|
|
host = self._hosts.get_host()
|
|
|
|
self.conn = self._make_connection(
|
|
host.hostname,
|
|
host.port,
|
|
host.username,
|
|
host.password,
|
|
self.virtual_host,
|
|
)
|
|
|
|
conn = kombu.connections[self.conn].acquire(block=True)
|
|
|
|
exchange = self._make_exchange(
|
|
self.exchange,
|
|
durable=self.durable_queue,
|
|
auto_delete=self.auto_delete
|
|
)
|
|
|
|
queue = self._make_queue(
|
|
self.topic,
|
|
exchange,
|
|
routing_key=self.routing_key,
|
|
durable=self.durable_queue,
|
|
auto_delete=self.auto_delete
|
|
)
|
|
with conn.Consumer(
|
|
queues=queue,
|
|
callbacks=[self._process_message],
|
|
) as consumer:
|
|
consumer.qos(prefetch_count=1)
|
|
|
|
self._running.set()
|
|
self._stopped.clear()
|
|
|
|
LOG.info("Connected to AMQP at %s:%s" % (
|
|
host.hostname,
|
|
host.port
|
|
))
|
|
|
|
while self.is_running:
|
|
try:
|
|
conn.drain_events(timeout=1)
|
|
except socket.timeout:
|
|
pass
|
|
except KeyboardInterrupt:
|
|
self.stop()
|
|
|
|
LOG.info("Server with id='{0}' stopped.".format(
|
|
self.server_id))
|
|
|
|
return
|
|
except (socket.error, amqp.exceptions.ConnectionForced) as e:
|
|
LOG.debug("Broker connection failed: %s" % e)
|
|
_retry_connection = True
|
|
finally:
|
|
self._stopped.set()
|
|
|
|
if _retry_connection:
|
|
LOG.debug(
|
|
"Sleeping for %s seconds, than retrying connection" %
|
|
self._sleep_time
|
|
)
|
|
|
|
time.sleep(self._sleep_time)
|
|
|
|
self._sleep_time = min(
|
|
self._sleep_time * 2,
|
|
self._max_sleep_time
|
|
)
|
|
|
|
def stop(self, graceful=False):
|
|
self._running.clear()
|
|
|
|
if graceful:
|
|
self.wait()
|
|
|
|
def wait(self):
|
|
self._stopped.wait()
|
|
try:
|
|
self._worker.shutdown(wait=True)
|
|
except AttributeError as e:
|
|
LOG.warning("Cannot stop worker in graceful way: %s" % e)
|
|
|
|
def _get_rpc_method(self, method_name):
|
|
for endpoint in self.endpoints:
|
|
if hasattr(endpoint, method_name):
|
|
return getattr(endpoint, method_name)
|
|
|
|
return None
|
|
|
|
@staticmethod
|
|
def _set_auth_ctx(ctx):
|
|
if not isinstance(ctx, dict):
|
|
return
|
|
|
|
context = auth_ctx.MistralContext(**ctx)
|
|
auth_ctx.set_ctx(context)
|
|
|
|
return context
|
|
|
|
def publish_message(self, body, reply_to, corr_id, res_type='response'):
|
|
if res_type != 'error':
|
|
body = self._serialize_message({'body': body})
|
|
|
|
with kombu.producers[self.conn].acquire(block=True) as producer:
|
|
producer.publish(
|
|
body=body,
|
|
exchange=self.exchange,
|
|
routing_key=reply_to,
|
|
correlation_id=corr_id,
|
|
serializer='pickle' if res_type == 'error' else 'json',
|
|
type=res_type
|
|
)
|
|
|
|
def _on_message_safe(self, request, message):
|
|
try:
|
|
return self._on_message(request, message)
|
|
except Exception as e:
|
|
LOG.warning(
|
|
"Got exception while consuming message. Exception would be "
|
|
"send back to the caller."
|
|
)
|
|
LOG.debug("Exceptions: %s" % str(e))
|
|
|
|
# Wrap exception into another exception for compability with oslo.
|
|
self.publish_message(
|
|
exc.KombuException(e),
|
|
message.properties['reply_to'],
|
|
message.properties['correlation_id'],
|
|
res_type='error'
|
|
)
|
|
finally:
|
|
message.ack()
|
|
|
|
def _on_message(self, request, message):
|
|
LOG.debug('Received message %s',
|
|
request)
|
|
|
|
is_async = request.get('async', False)
|
|
rpc_ctx = request.get('rpc_ctx')
|
|
redelivered = message.delivery_info.get('redelivered', None)
|
|
rpc_method_name = request.get('rpc_method')
|
|
arguments = self._deserialize_message(request.get('arguments'))
|
|
correlation_id = message.properties['correlation_id']
|
|
reply_to = message.properties['reply_to']
|
|
|
|
if redelivered is not None:
|
|
rpc_ctx['redelivered'] = redelivered
|
|
|
|
rpc_context = self._set_auth_ctx(rpc_ctx)
|
|
|
|
rpc_method = self._get_rpc_method(rpc_method_name)
|
|
|
|
if not rpc_method:
|
|
raise exc.MistralException("No such method: %s" % rpc_method_name)
|
|
|
|
response = rpc_method(rpc_ctx=rpc_context, **arguments)
|
|
|
|
if not is_async:
|
|
self.publish_message(
|
|
response,
|
|
reply_to,
|
|
correlation_id
|
|
)
|
|
|
|
def register_endpoint(self, endpoint):
|
|
self.endpoints.append(endpoint)
|
|
|
|
def _process_message(self, request, message):
|
|
self._worker.submit(self._on_message_safe, request, message)
|
|
|
|
def _prepare_worker(self, executor='blocking'):
|
|
mgr = driver.DriverManager('kombu_driver.executors', executor)
|
|
|
|
executor_opts = {}
|
|
if executor == 'threading':
|
|
executor_opts['max_workers'] = self._executor_threads
|
|
|
|
self._worker = mgr.driver(**executor_opts)
|