| # |
| # 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. |
| # |
| |
| from __future__ import unicode_literals |
| from __future__ import division |
| from __future__ import absolute_import |
| from __future__ import print_function |
| |
| from .data import MessageHELLO |
| from ..dispatch import LOG_INFO, LOG_TRACE, LOG_CRITICAL |
| from ..compat import dict_keys |
| from ..compat import dict_items |
| |
| |
| class HelloProtocol(object): |
| """ |
| This module is responsible for running the HELLO protocol. |
| """ |
| |
| def __init__(self, container, node_tracker): |
| self.container = container |
| self.node_tracker = node_tracker |
| self.id = self.container.id |
| self.ticks = 0.0 |
| self.last_hello_ticks = 0.0 |
| self.hello_interval = container.config.helloIntervalSeconds |
| self.hello_max_age = container.config.helloMaxAgeSeconds |
| self.hellos = {} |
| self.dup_reported = False |
| |
| def tick(self, now): |
| self._expire_hellos(now) |
| self.ticks += 1.0 |
| if self.ticks - self.last_hello_ticks >= self.hello_interval: |
| self.last_hello_ticks = self.ticks |
| msg = MessageHELLO(None, self.id, dict_keys(self.hellos), self.container.instance) |
| self.container.send('amqp:/_local/qdhello', msg) |
| self.container.log_hello(LOG_TRACE, "SENT: %r" % msg) |
| |
| def handle_hello(self, msg, now, link_id, cost): |
| if msg.id == self.id: |
| if not self.dup_reported and (msg.instance != self.container.instance): |
| self.dup_reported = True |
| self.container.log_hello(LOG_CRITICAL, "Detected Neighbor Router with a Duplicate ID - %s" % msg.id) |
| return |
| self.hellos[msg.id] = now |
| if msg.is_seen(self.id): |
| self.node_tracker.neighbor_refresh(msg.id, msg.version, msg.instance, link_id, cost, now) |
| |
| def _expire_hellos(self, now): |
| """ |
| Expire local records of received hellos. This is not involved in the |
| expiration of neighbor status for routers. |
| """ |
| for key, last_seen in dict_items(self.hellos): |
| if now - last_seen > self.hello_max_age: |
| self.hellos.pop(key) |
| self.container.log_hello(LOG_TRACE, "HELLO peer expired: %s" % key) |
