Shashikanth VH | 9ac1dee | 2015-11-21 00:15:51 +0530 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2015 Open Networking Laboratory |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with |
| 5 | * the License. You may obtain a copy of the License at |
| 6 | * |
| 7 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 8 | * |
| 9 | * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on |
| 10 | * an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the |
| 11 | * specific language governing permissions and limitations under the License. |
| 12 | */ |
| 13 | package org.onosproject.bgp.controller.impl; |
| 14 | |
| 15 | import java.net.InetSocketAddress; |
| 16 | import java.util.concurrent.Executors; |
| 17 | import java.util.concurrent.ScheduledExecutorService; |
| 18 | import java.util.concurrent.TimeUnit; |
| 19 | |
| 20 | import org.jboss.netty.bootstrap.ClientBootstrap; |
| 21 | import org.jboss.netty.channel.ChannelFuture; |
| 22 | import org.jboss.netty.channel.ChannelFutureListener; |
| 23 | import org.jboss.netty.channel.ChannelPipelineFactory; |
| 24 | import org.onosproject.bgp.controller.BGPCfg; |
| 25 | import org.onosproject.bgp.controller.BGPController; |
| 26 | import org.onosproject.bgp.controller.BGPPeerCfg; |
| 27 | import org.onosproject.bgp.controller.BgpConnectPeer; |
| 28 | import org.slf4j.Logger; |
| 29 | import org.slf4j.LoggerFactory; |
| 30 | |
| 31 | /** |
| 32 | * Implements connection initiation to peer on peer configuration and manage channel using netty channel handler. |
| 33 | */ |
| 34 | public class BgpConnectPeerImpl implements BgpConnectPeer { |
| 35 | private static final Logger log = LoggerFactory.getLogger(BgpConnectPeerImpl.class); |
| 36 | |
| 37 | private ScheduledExecutorService connectExecutor = null; |
| 38 | private final String peerHost; |
| 39 | private static final int RETRY_INTERVAL = 4; |
| 40 | private final int peerPort; |
| 41 | private int connectRetryCounter = 0; |
| 42 | private int connectRetryTime; |
| 43 | private ChannelPipelineFactory pfact; |
| 44 | private ClientBootstrap peerBootstrap; |
| 45 | private BGPCfg bgpconfig; |
| 46 | |
| 47 | /** |
| 48 | * Initialize timer and initiate pipeline factory. |
| 49 | * |
| 50 | * @param bgpController parent BGP controller |
| 51 | * @param remoteHost remote host to connect |
| 52 | * @param remotePort remote port to connect |
| 53 | */ |
| 54 | public BgpConnectPeerImpl(BGPController bgpController, String remoteHost, int remotePort) { |
| 55 | |
| 56 | this.bgpconfig = bgpController.getConfig(); |
| 57 | this.pfact = new BGPPipelineFactory(bgpController, false); |
| 58 | this.peerBootstrap = Controller.peerBootstrap(); |
| 59 | this.peerBootstrap.setPipelineFactory(pfact); |
| 60 | this.peerHost = remoteHost; |
| 61 | this.peerPort = remotePort; |
| 62 | this.connectRetryTime = 0; |
| 63 | } |
| 64 | |
| 65 | @Override |
| 66 | public void disconnectPeer() { |
| 67 | if (connectExecutor != null) { |
| 68 | connectExecutor.shutdown(); |
| 69 | connectExecutor = null; |
| 70 | } |
| 71 | } |
| 72 | |
| 73 | @Override |
| 74 | public void connectPeer() { |
| 75 | scheduleConnectionRetry(this.connectRetryTime); |
| 76 | } |
| 77 | |
| 78 | /** |
| 79 | * Retry connection with exponential back-off mechanism. |
| 80 | * |
| 81 | * @param retryDelay retry delay |
| 82 | */ |
| 83 | private void scheduleConnectionRetry(long retryDelay) { |
| 84 | if (this.connectExecutor == null) { |
| 85 | this.connectExecutor = Executors.newSingleThreadScheduledExecutor(); |
| 86 | } |
| 87 | this.connectExecutor.schedule(new ConnectionRetry(), retryDelay, TimeUnit.MINUTES); |
| 88 | } |
| 89 | |
| 90 | /** |
| 91 | * Implements BGP connection and manages connection to peer with back-off mechanism in case of failure. |
| 92 | */ |
| 93 | class ConnectionRetry implements Runnable { |
| 94 | @Override |
| 95 | public void run() { |
| 96 | log.debug("Connect to peer {}", peerHost); |
| 97 | |
| 98 | InetSocketAddress connectToSocket = new InetSocketAddress(peerHost, peerPort); |
| 99 | |
| 100 | try { |
| 101 | bgpconfig.setPeerConnState(peerHost, BGPPeerCfg.State.CONNECT); |
| 102 | peerBootstrap.connect(connectToSocket).addListener(new ChannelFutureListener() { |
| 103 | @Override |
| 104 | public void operationComplete(ChannelFuture future) throws Exception { |
| 105 | if (!future.isSuccess()) { |
| 106 | bgpconfig.setPeerConnState(peerHost, BGPPeerCfg.State.ACTIVE); |
| 107 | connectRetryCounter++; |
| 108 | log.error("Connection failed, ConnectRetryCounter {} remote host {}", connectRetryCounter, |
| 109 | peerHost); |
| 110 | /* |
| 111 | * Reconnect to peer on failure is exponential till 4 mins, later on retry after every 4 |
| 112 | * mins. |
| 113 | */ |
| 114 | if (connectRetryTime < RETRY_INTERVAL) { |
| 115 | connectRetryTime = (connectRetryTime != 0) ? connectRetryTime * 2 : 1; |
| 116 | } |
| 117 | scheduleConnectionRetry(connectRetryTime); |
| 118 | } else { |
| 119 | |
| 120 | connectRetryCounter++; |
| 121 | log.info("Connected to remote host {}, Connect Counter {}", peerHost, connectRetryCounter); |
| 122 | disconnectPeer(); |
| 123 | return; |
| 124 | } |
| 125 | } |
| 126 | }); |
| 127 | } catch (Exception e) { |
| 128 | log.info("Connect peer exception : " + e.toString()); |
| 129 | disconnectPeer(); |
| 130 | } |
| 131 | } |
| 132 | } |
| 133 | } |