247 lines
9.0 KiB
Python
247 lines
9.0 KiB
Python
# All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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import time
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from oslo_log import log as logging
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from oslo_serialization import jsonutils
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import redis
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from dragonflow.controller.common import constants
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from dragonflow.db import api_nb
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from dragonflow.db.drivers import redis_mgt
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from dragonflow.db import pub_sub_api
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LOG = logging.getLogger(__name__)
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class RedisPubSub(pub_sub_api.PubSubApi):
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def __init__(self):
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super(RedisPubSub, self).__init__()
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self.subscriber = RedisSubscriberAgent()
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self.publisher = RedisPublisherAgent()
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self.redis_mgt = None
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def get_publisher(self):
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return self.publisher
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def get_subscriber(self):
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return self.subscriber
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class RedisPublisherAgent(pub_sub_api.PublisherAgentBase):
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publish_retry_times = 5
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def __init__(self):
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super(RedisPublisherAgent, self).__init__()
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self.remote = None
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self.client = None
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self.redis_mgt = None
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def initialize(self):
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# find a publisher server node
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super(RedisPublisherAgent, self).initialize()
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ip, port = api_nb.get_db_ip_port()
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self.redis_mgt = redis_mgt.RedisMgt.get_instance(ip, port)
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self._update_client()
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def close(self):
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if self.remote:
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self.client.connection_pool.disconnect()
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self.client = None
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self.remote = None
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def _update_client(self):
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if self.redis_mgt is not None:
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self.remote = self.redis_mgt.pubsub_select_node_idx()
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if self.remote is not None:
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ip_port = self.remote.split(':')
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self.client = redis.client.StrictRedis(host=ip_port[0],
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port=ip_port[1])
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def process_ha(self):
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# None means that publisher connection should be updated.
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# If not None, the publisher connection is still working and is not
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# broken by DB single point failure.
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if self.remote is None:
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self._update_client()
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def _sync_master_list(self):
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LOG.info("publish connection old masterlist %s",
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self.redis_mgt.master_list)
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result = self.redis_mgt.redis_get_master_list_from_syncstring(
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redis_mgt.RedisMgt.global_sharedlist.raw)
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LOG.info("publish connection new masterlist %s",
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self.redis_mgt.master_list)
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if result:
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self._update_client()
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def _send_event(self, data, topic):
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ttl = self.publish_retry_times
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alreadysync = False
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while ttl > 0:
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ttl -= 1
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try:
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if self.client is not None:
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self.client.publish(topic, data)
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break
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except Exception:
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if not alreadysync:
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self._sync_master_list()
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alreadysync = True
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LOG.exception("publish error remote:%(remote)s ",
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{'remote': self.remote})
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continue
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self.redis_mgt.remove_node_from_master_list(self.remote)
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self._update_client()
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def set_publisher_for_failover(self, pub, callback):
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self.redis_mgt.set_publisher(pub, callback)
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def start_detect_for_failover(self):
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# only start in NB plugin
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if self.redis_mgt is not None:
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self.redis_mgt.daemonize()
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else:
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LOG.warning("redis mgt is none")
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class RedisSubscriberAgent(pub_sub_api.SubscriberAgentBase):
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def __init__(self):
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super(RedisSubscriberAgent, self).__init__()
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self.remote = None
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self.client = None
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self.ip = ""
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self.plugin_updates_port = ""
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self.pub_sub = None
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self.redis_mgt = None
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self.is_closed = True
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def initialize(self, callback):
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# find a subscriber server node and run daemon
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super(RedisSubscriberAgent, self).initialize(callback)
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ip, port = api_nb.get_db_ip_port()
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self.redis_mgt = redis_mgt.RedisMgt.get_instance(ip, port)
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self._update_client()
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self.is_closed = False
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def process_ha(self):
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# None means that subscriber connection should be updated.
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# If not None, the subscriber connection is still working and is not
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# broken by DB single point failure.
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if self.remote is None:
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self._update_client()
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def _update_client(self):
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if self.redis_mgt is not None:
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self.remote = self.redis_mgt.pubsub_select_node_idx()
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if self.remote is not None:
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ip_port = self.remote.split(':')
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self.client = \
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redis.client.StrictRedis(host=ip_port[0], port=ip_port[1])
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self.ip = ip_port[0]
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self.plugin_updates_port = ip_port[1]
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self.pub_sub = self.client.pubsub()
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def close(self):
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self.redis_mgt = None
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self.pub_sub.close()
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self.pub_sub = None
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self.is_closed = True
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def register_topic(self, topic):
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self.pub_sub.subscribe(topic)
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def unregister_topic(self, topic):
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self.pub_sub.unsubscribe(topic)
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def set_subscriber_for_failover(self, sub, callback):
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self.redis_mgt.set_subscriber(sub, callback)
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def register_hamsg_for_db(self):
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if self.redis_mgt is not None:
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self.redis_mgt.register_ha_topic()
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else:
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LOG.warning("redis mgt is none")
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def run(self):
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while not self.is_closed:
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time.sleep(0)
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try:
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if self.pub_sub is not None:
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for data in self.pub_sub.listen():
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if 'subscribe' == data['type']:
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continue
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elif 'unsubscribe' == data['type']:
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continue
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elif 'message' == data['type']:
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# Redis managment module publishes node list
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# on topic 'redis'.
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# All other topics are for the user.
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if data['channel'] == 'redis':
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# redis ha message
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message = pub_sub_api.unpack_message(
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data['data'])
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value = jsonutils.loads(message['value'])
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self.redis_mgt.redis_failover_callback(
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value)
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else:
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self._handle_incoming_event(data['data'])
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else:
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LOG.warning("receive unknown message in "
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"subscriber %(type)s",
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{'type': data['type']})
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else:
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LOG.warning("pubsub lost connection %(ip)s:"
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"%(port)s",
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{'ip': self.ip,
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'port': self.plugin_updates_port})
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time.sleep(1)
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except Exception as e:
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LOG.warning("subscriber listening task lost "
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"connection "
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"%(e)s", {'e': e})
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try:
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connection = self.pub_sub.connection
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connection.connect()
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self.pub_sub.on_connect(connection)
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# self.db_changes_callback(None, None, 'sync', None, None)
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# notify restart
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self.db_changes_callback(None, None,
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constants.CONTROLLER_DBRESTART,
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False, None)
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except Exception:
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self.redis_mgt.remove_node_from_master_list(self.remote)
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self._update_client()
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# if pubsub not none notify restart
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if self.remote is not None:
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# to re-subscribe
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self.register_hamsg_for_db()
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self.db_changes_callback(
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None, None, constants.CONTROLLER_DBRESTART, True,
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None)
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else:
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LOG.warning("there is no more db node available")
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LOG.exception("reconnect error %(ip)s:%(port)s",
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{'ip': self.ip,
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'port': self.plugin_updates_port})
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