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#
# Copyright (c) 2014 Juniper Networks, Inc. All rights reserved.
#
import re
import amqp.exceptions
import kombu
import gevent
import gevent.monkey
gevent.monkey.patch_all()
import time
from gevent.queue import Queue
try:
from gevent.lock import Semaphore
except ImportError:
# older versions of gevent
from gevent.coros import Semaphore
from pysandesh.connection_info import ConnectionState
from pysandesh.gen_py.process_info.ttypes import ConnectionStatus, \
ConnectionType
from pysandesh.gen_py.sandesh.ttypes import SandeshLevel
__all__ = "VncKombuClient"
class VncKombuClientBase(object):
def _update_sandesh_status(self, status, msg=''):
ConnectionState.update(conn_type=ConnectionType.DATABASE,
name='RabbitMQ', status=status, message=msg,
server_addrs=["%s:%s" % (self._rabbit_ip, self._rabbit_port)])
# end _update_sandesh_status
def publish(self, message):
self._publish_queue.put(message)
# end publish
def __init__(self, rabbit_ip, rabbit_port, rabbit_user, rabbit_password,
rabbit_vhost, rabbit_ha_mode, q_name, subscribe_cb, logger):
self._rabbit_ip = rabbit_ip
self._rabbit_port = rabbit_port
self._rabbit_user = rabbit_user
self._rabbit_password = rabbit_password
self._rabbit_vhost = rabbit_vhost
self._subscribe_cb = subscribe_cb
self._logger = logger
self._publish_queue = Queue()
self._conn_lock = Semaphore()
self.obj_upd_exchange = kombu.Exchange('vnc_config.object-update', 'fanout',
durable=False)
def num_pending_messages(self):
return self._publish_queue.qsize()
# end num_pending_messages
def prepare_to_consume(self):
# override this method
return
def _reconnect(self, delete_old_q=False):
if self._conn_lock.locked():
# either connection-monitor or publisher should have taken
# the lock. The one who acquired the lock would re-establish
# the connection and releases the lock, so the other one can
# just wait on the lock, till it gets released
self._conn_lock.wait()
return
self._conn_lock.acquire()
msg = "RabbitMQ connection down"
self._logger(msg, level=SandeshLevel.SYS_ERR)
self._update_sandesh_status(ConnectionStatus.DOWN)
self._conn_state = ConnectionStatus.DOWN
self._conn.close()
self._conn.ensure_connection()
self._conn.connect()
self._update_sandesh_status(ConnectionStatus.UP)
self._conn_state = ConnectionStatus.UP
msg = 'RabbitMQ connection ESTABLISHED %s' % repr(self._conn)
self._logger(msg, level=SandeshLevel.SYS_NOTICE)
self._channel = self._conn.channel()
if delete_old_q:
# delete the old queue in first-connect context
# as db-resync would have caught up with history.
try:
bound_q = self._update_queue_obj(self._channel)
bound_q.delete()
except Exception as e:
msg = 'Unable to delete the old ampq queue: %s' %(str(e))
self._logger(msg, level=SandeshLevel.SYS_ERR)
self._consumer = kombu.Consumer(self._channel,
queues=self._update_queue_obj,
callbacks=[self._subscribe])
self._producer = kombu.Producer(self._channel, exchange=self.obj_upd_exchange)
self._conn_lock.release()
# end _reconnect
def _connection_watch(self):
self.prepare_to_consume()
while True:
try:
self._consumer.consume()
self._conn.drain_events()
except self._conn.connection_errors + self._conn.channel_errors as e:
self._reconnect()
# end _connection_watch
def _publisher(self):
message = None
while True:
try:
if not message:
# earlier was sent fine, dequeue one more
message = self._publish_queue.get()
while True:
try:
self._producer.publish(message)
message = None
break
except self._conn.connection_errors + self._conn.channel_errors as e:
self._reconnect()
except Exception as e:
log_str = "Unknown exception in _publisher greenlet" + str(e)
self._logger(log_str, level=SandeshLevel.SYS_ERR)
# end _publisher
def _subscribe(self, body, message):
try:
self._subscribe_cb(body)
finally:
message.ack()
def _start(self):
self._reconnect(delete_old_q=True)
self._publisher_greenlet = gevent.spawn(self._publisher)
self._connection_monitor_greenlet = gevent.spawn(self._connection_watch)
def shutdown(self):
self._publisher_greenlet.kill()
self._connection_monitor_greenlet.kill()
self._producer.close()
self._consumer.close()
self._conn.close()
class VncKombuClientV1(VncKombuClientBase):
def __init__(self, rabbit_ip, rabbit_port, rabbit_user, rabbit_password,
rabbit_vhost, rabbit_ha_mode, q_name, subscribe_cb, logger):
super(VncKombuClientV1, self).__init__(rabbit_ip, rabbit_port,
rabbit_user, rabbit_password,
rabbit_vhost, rabbit_ha_mode,
q_name, subscribe_cb, logger)
self._conn = kombu.Connection(hostname=self._rabbit_ip,
port=self._rabbit_port,
userid=self._rabbit_user,
password=self._rabbit_password,
virtual_host=self._rabbit_vhost)
self._update_queue_obj = kombu.Queue(q_name, self.obj_upd_exchange, durable=False)
self._start()
# end __init__
class VncKombuClientV2(VncKombuClientBase):
def _parse_rabbit_hosts(self, rabbit_hosts):
server_list = rabbit_hosts.split(",")
default_dict = {'user': self._rabbit_user,
'password': self._rabbit_password,
'port': self._rabbit_port}
ret = []
for s in server_list:
match = re.match("(?:(?P<user>.*?)(?::(?P<password>.*?))*@)*(?P<host>.*?)(?::(?P<port>\d+))*$", s)
if match:
mdict = match.groupdict().copy()
for key in ['user', 'password', 'port']:
if not mdict[key]:
mdict[key] = default_dict[key]
ret.append(mdict)
return ret
def __init__(self, rabbit_hosts, rabbit_port, rabbit_user, rabbit_password,
rabbit_vhost, rabbit_ha_mode, q_name, subscribe_cb, logger):
super(VncKombuClientV2, self).__init__(rabbit_hosts, rabbit_port,
rabbit_user, rabbit_password,
rabbit_vhost, rabbit_ha_mode,
q_name, subscribe_cb, logger)
_hosts = self._parse_rabbit_hosts(rabbit_hosts)
self._urls = []
for h in _hosts:
h['vhost'] = "" if not rabbit_vhost else rabbit_vhost
_url = "pyamqp://%(user)s:%(password)s@%(host)s:%(port)s/%(vhost)s/" % h
self._urls.append(_url)
msg = "Initializing RabbitMQ connection, urls %s" % self._urls
self._logger(msg, level=SandeshLevel.SYS_NOTICE)
self._update_sandesh_status(ConnectionStatus.INIT)
self._conn_state = ConnectionStatus.INIT
self._conn = kombu.Connection(self._urls)
queue_args = {"x-ha-policy": "all"} if rabbit_ha_mode else None
self._update_queue_obj = kombu.Queue(q_name, self.obj_upd_exchange,
durable=False,
queue_arguments=queue_args)
self._start()
# end __init__
from distutils.version import LooseVersion
if LooseVersion(kombu.__version__) >= LooseVersion("2.5.0"):
VncKombuClient = VncKombuClientV2
else:
VncKombuClient = VncKombuClientV1
|
