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#
# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements. See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership. The ASF licenses this file
# to you 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.
#
"""
Add-on utilities for the L{qpid.messaging} API.
"""
from logging import getLogger
from threading import Thread
log = getLogger("qpid.messaging.util")
def auto_update_backups(conn):
ssn = conn.session("auto-update-backups")
rcv = ssn.receiver("amq.failover")
rcv.capacity = 10
def main():
while True:
msg = rcv.fetch()
update_backups(conn, msg)
ssn.acknowledge(msg, sync=False)
thread = Thread(name="auto-update-backups", target=main)
thread.setDaemon(True)
thread.start()
def update_backups(conn, msg):
backups = []
urls = msg.properties["amq.failover"]
for u in urls:
if u.startswith("amqp:tcp:"):
parts = u.split(":")
host, port = parts[2:4]
backups.append((host, port))
conn.backups = backups
log.warn("updated backups for conn %s: %s", conn, backups)
__all__ = ["auto_update_backups", "update_backups"]
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