c558da07b6
Update hacking to the new requirements version and
fix about half of the new reported issues. The other
hacking issues are for now ignored until fixed by
adjusting our tox.ini file.
This commit fixes the following new hacking errors:
H405 - multi line docstring summary not separated
with an empty line
E265 - block comment should start with '# '
F402 - import 'endpoint' from line 21 shadowed by
loop variable
Change-Id: I6bae61591fb988cc17fa79e21cb5f1508d22781c
115 lines
4.3 KiB
Python
115 lines
4.3 KiB
Python
# -*- coding: utf-8 -*-
|
|
|
|
# Copyright (C) 2014 Yahoo! Inc. All Rights Reserved.
|
|
#
|
|
# 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 kombu
|
|
import logging
|
|
import socket
|
|
import threading
|
|
|
|
import six
|
|
|
|
LOG = logging.getLogger(__name__)
|
|
|
|
# NOTE(skudriashev): A timeout of 1 is often used in environments where
|
|
# the socket can get "stuck", and is a best practice for Kombu consumers.
|
|
DRAIN_EVENTS_PERIOD = 1
|
|
|
|
|
|
class Proxy(object):
|
|
"""A proxy processes messages from/to the named exchange."""
|
|
|
|
def __init__(self, topic, exchange_name, on_message, on_wait=None,
|
|
**kwargs):
|
|
self._topic = topic
|
|
self._exchange_name = exchange_name
|
|
self._on_message = on_message
|
|
self._on_wait = on_wait
|
|
self._running = threading.Event()
|
|
self._url = kwargs.get('url')
|
|
self._transport = kwargs.get('transport')
|
|
self._transport_opts = kwargs.get('transport_options')
|
|
|
|
self._drain_events_timeout = DRAIN_EVENTS_PERIOD
|
|
if self._transport == 'memory' and self._transport_opts:
|
|
polling_interval = self._transport_opts.get('polling_interval')
|
|
if polling_interval:
|
|
self._drain_events_timeout = polling_interval
|
|
|
|
# create connection
|
|
self._conn = kombu.Connection(self._url, transport=self._transport,
|
|
transport_options=self._transport_opts)
|
|
|
|
# create exchange
|
|
self._exchange = kombu.Exchange(name=self._exchange_name,
|
|
durable=False,
|
|
auto_delete=True)
|
|
|
|
@property
|
|
def is_running(self):
|
|
"""Return whether the proxy is running."""
|
|
return self._running.is_set()
|
|
|
|
def _make_queue(self, name, exchange, **kwargs):
|
|
"""Make named queue for the given exchange."""
|
|
return kombu.Queue(name="%s_%s" % (self._exchange_name, name),
|
|
exchange=exchange,
|
|
routing_key=name,
|
|
durable=False,
|
|
auto_delete=True,
|
|
**kwargs)
|
|
|
|
def publish(self, msg, routing_key, **kwargs):
|
|
"""Publish message to the named exchange with given routing key."""
|
|
LOG.debug("Sending %s", msg)
|
|
if isinstance(routing_key, six.string_types):
|
|
routing_keys = [routing_key]
|
|
else:
|
|
routing_keys = routing_key
|
|
with kombu.producers[self._conn].acquire(block=True) as producer:
|
|
for routing_key in routing_keys:
|
|
queue = self._make_queue(routing_key, self._exchange)
|
|
producer.publish(body=msg.to_dict(),
|
|
routing_key=routing_key,
|
|
exchange=self._exchange,
|
|
declare=[queue],
|
|
type=msg.TYPE,
|
|
**kwargs)
|
|
|
|
def start(self):
|
|
"""Start proxy."""
|
|
LOG.info("Starting to consume from the '%s' exchange.",
|
|
self._exchange_name)
|
|
with kombu.connections[self._conn].acquire(block=True) as conn:
|
|
queue = self._make_queue(self._topic, self._exchange, channel=conn)
|
|
with conn.Consumer(queues=queue,
|
|
callbacks=[self._on_message]):
|
|
self._running.set()
|
|
while self.is_running:
|
|
try:
|
|
conn.drain_events(timeout=self._drain_events_timeout)
|
|
except socket.timeout:
|
|
pass
|
|
if self._on_wait is not None:
|
|
self._on_wait()
|
|
|
|
def wait(self):
|
|
"""Wait until proxy is started."""
|
|
self._running.wait()
|
|
|
|
def stop(self):
|
|
"""Stop proxy."""
|
|
self._running.clear()
|