2 * Copyright (c) 2013 Cisco Systems, Inc. and others. All rights reserved.
4 * This program and the accompanying materials are made available under the
5 * terms of the Eclipse Public License v1.0 which accompanies this distribution,
6 * and is available at http://www.eclipse.org/legal/epl-v10.html
8 package org.opendaylight.protocol.pcep.impl;
10 import com.google.common.annotations.VisibleForTesting;
11 import com.google.common.base.Objects;
12 import com.google.common.base.Objects.ToStringHelper;
13 import com.google.common.base.Preconditions;
15 import io.netty.channel.Channel;
16 import io.netty.channel.ChannelFuture;
17 import io.netty.channel.ChannelFutureListener;
18 import io.netty.util.concurrent.Future;
20 import java.io.IOException;
21 import java.net.InetAddress;
22 import java.net.InetSocketAddress;
23 import java.util.Date;
24 import java.util.LinkedList;
25 import java.util.Queue;
26 import java.util.concurrent.TimeUnit;
28 import org.opendaylight.protocol.framework.AbstractProtocolSession;
29 import org.opendaylight.protocol.pcep.PCEPCloseTermination;
30 import org.opendaylight.protocol.pcep.PCEPSession;
31 import org.opendaylight.protocol.pcep.PCEPSessionListener;
32 import org.opendaylight.protocol.pcep.TerminationReason;
33 import org.opendaylight.protocol.pcep.spi.PCEPErrors;
34 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.message.rev131007.CloseBuilder;
35 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.message.rev131007.Keepalive;
36 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.message.rev131007.KeepaliveBuilder;
37 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.CloseMessage;
38 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.KeepaliveMessage;
39 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.Message;
40 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.OpenMessage;
41 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.close.message.CCloseMessageBuilder;
42 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.close.object.CCloseBuilder;
43 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.keepalive.message.KeepaliveMessageBuilder;
44 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.open.object.Open;
45 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.open.object.open.Tlvs;
46 import org.slf4j.Logger;
47 import org.slf4j.LoggerFactory;
50 * Implementation of PCEPSession. (Not final for testing.)
53 public class PCEPSessionImpl extends AbstractProtocolSession<Message> implements PCEPSession, PCEPSessionRuntimeMXBean {
55 * System.nanoTime value about when was sent the last message Protected to be updated also in tests.
58 protected volatile long lastMessageSentAt;
61 * System.nanoTime value about when was received the last message
63 private long lastMessageReceivedAt;
66 protected final Queue<Long> unknownMessagesTimes = new LinkedList<Long>();
68 private final PCEPSessionListener listener;
71 * Open Object with session characteristics that were accepted by another PCE (sent from this session).
73 private final Open localOpen;
76 * Open Object with session characteristics for this session (sent from another PCE).
78 private final Open remoteOpen;
80 private static final Logger LOG = LoggerFactory.getLogger(PCEPSessionImpl.class);
82 private int sentMsgCount = 0;
84 private int receivedMsgCount = 0;
86 private int maxUnknownMessages;
88 // True if the listener should not be notified about events
89 private boolean closed = false;
91 private final Channel channel;
93 private final Keepalive kaMessage = new KeepaliveBuilder().setKeepaliveMessage(new KeepaliveMessageBuilder().build()).build();
95 PCEPSessionImpl(final PCEPSessionListener listener, final int maxUnknownMessages, final Channel channel,
96 final Open localOpen, final Open remoteOpen) {
97 this.listener = Preconditions.checkNotNull(listener);
98 this.channel = Preconditions.checkNotNull(channel);
99 this.localOpen = Preconditions.checkNotNull(localOpen);
100 this.remoteOpen = Preconditions.checkNotNull(remoteOpen);
101 this.lastMessageReceivedAt = System.nanoTime();
103 if (maxUnknownMessages != 0) {
104 this.maxUnknownMessages = maxUnknownMessages;
108 if (getDeadTimerValue() != 0) {
109 channel.eventLoop().schedule(new Runnable() {
114 }, getDeadTimerValue(), TimeUnit.SECONDS);
117 if (getKeepAliveTimerValue() != 0) {
118 channel.eventLoop().schedule(new Runnable() {
121 handleKeepaliveTimer();
123 }, getKeepAliveTimerValue(), TimeUnit.SECONDS);
126 LOG.info("Session {}[{}] <-> {}[{}] started", channel.localAddress(), localOpen.getSessionId(), channel.remoteAddress(),
127 remoteOpen.getSessionId());
131 * If DeadTimer expires, the session ends. If a message (whichever) was received during this period, the DeadTimer
132 * will be rescheduled by DEAD_TIMER_VALUE + the time that has passed from the start of the DeadTimer to the time at
133 * which the message was received. If the session was closed by the time this method starts to execute (the session
134 * state will become IDLE), that rescheduling won't occur.
136 private synchronized void handleDeadTimer() {
137 final long ct = System.nanoTime();
139 final long nextDead = this.lastMessageReceivedAt + TimeUnit.SECONDS.toNanos(getDeadTimerValue());
141 if (this.channel.isActive()) {
142 if (ct >= nextDead) {
143 LOG.debug("DeadTimer expired. {}", new Date());
144 this.terminate(TerminationReason.ExpDeadtimer);
146 this.channel.eventLoop().schedule(new Runnable() {
151 }, nextDead - ct, TimeUnit.NANOSECONDS);
157 * If KeepAlive Timer expires, sends KeepAlive message. If a message (whichever) was send during this period, the
158 * KeepAlive Timer will be rescheduled by KEEP_ALIVE_TIMER_VALUE + the time that has passed from the start of the
159 * KeepAlive timer to the time at which the message was sent. If the session was closed by the time this method
160 * starts to execute (the session state will become IDLE), that rescheduling won't occur.
162 private void handleKeepaliveTimer() {
163 final long ct = System.nanoTime();
165 long nextKeepalive = this.lastMessageSentAt + TimeUnit.SECONDS.toNanos(getKeepAliveTimerValue());
167 if (this.channel.isActive()) {
168 if (ct >= nextKeepalive) {
169 this.sendMessage(this.kaMessage);
170 nextKeepalive = this.lastMessageSentAt + TimeUnit.SECONDS.toNanos(getKeepAliveTimerValue());
173 this.channel.eventLoop().schedule(new Runnable() {
176 handleKeepaliveTimer();
178 }, nextKeepalive - ct, TimeUnit.NANOSECONDS);
183 * Sends message to serialization.
185 * @param msg to be sent
188 public Future<Void> sendMessage(final Message msg) {
189 final ChannelFuture f = this.channel.writeAndFlush(msg);
190 this.lastMessageSentAt = System.nanoTime();
191 if (!(msg instanceof KeepaliveMessage)) {
192 LOG.debug("PCEP Message enqueued: {}", msg);
196 f.addListener(new ChannelFutureListener() {
198 public void operationComplete(final ChannelFuture arg) {
199 if (arg.isSuccess()) {
200 LOG.trace("Message sent to socket: {}", msg);
202 LOG.debug("Message not sent: {}", msg, arg.cause());
211 * Closes PCEP session without sending a Close message, as the channel is no longer active.
214 public void close() {
215 LOG.info("Closing PCEP session: {}", this);
216 this.channel.close();
220 * Closes PCEP session, cancels all timers, returns to state Idle, sends the Close Message. KeepAlive and DeadTimer
221 * are cancelled if the state of the session changes to IDLE. This method is used to close the PCEP session from
222 * inside the session or from the listener, therefore the parent of this session should be informed.
225 public synchronized void close(final TerminationReason reason) {
226 LOG.info("Closing PCEP session: {}", this);
228 this.sendMessage(new CloseBuilder().setCCloseMessage(
229 new CCloseMessageBuilder().setCClose(new CCloseBuilder().setReason(reason.getShortValue()).build()).build()).build());
230 this.channel.close();
234 public Tlvs getRemoteTlvs() {
235 return this.remoteOpen.getTlvs();
239 public InetAddress getRemoteAddress() {
240 return ((InetSocketAddress) this.channel.remoteAddress()).getAddress();
243 private synchronized void terminate(final TerminationReason reason) {
244 LOG.info("Local PCEP session termination : {}", reason);
245 this.listener.onSessionTerminated(this, new PCEPCloseTermination(reason));
247 this.sendMessage(new CloseBuilder().setCCloseMessage(
248 new CCloseMessageBuilder().setCClose(new CCloseBuilder().setReason(reason.getShortValue()).build()).build()).build());
253 public synchronized void endOfInput() {
255 this.listener.onSessionDown(this, new IOException("End of input detected. Close the session."));
260 private void sendErrorMessage(final PCEPErrors value) {
261 this.sendErrorMessage(value, null);
265 * Sends PCEP Error Message with one PCEPError and Open Object.
270 private void sendErrorMessage(final PCEPErrors value, final Open open) {
271 this.sendMessage(Util.createErrorMessage(value, open));
275 * The fact, that a message is malformed, comes from parser. In case of unrecognized message a particular error is
276 * sent (CAPABILITY_NOT_SUPPORTED) and the method checks if the MAX_UNKNOWN_MSG per minute wasn't overstepped.
277 * Second, any other error occurred that is specified by rfc. In this case, the an error message is generated and
280 * @param error documented error in RFC5440 or draft
283 public void handleMalformedMessage(final PCEPErrors error) {
284 final long ct = System.nanoTime();
285 this.sendErrorMessage(error);
286 if (error == PCEPErrors.CAPABILITY_NOT_SUPPORTED) {
287 this.unknownMessagesTimes.add(ct);
288 while (ct - this.unknownMessagesTimes.peek() > 60 * 1E9) {
289 this.unknownMessagesTimes.poll();
291 if (this.unknownMessagesTimes.size() > this.maxUnknownMessages) {
292 this.terminate(TerminationReason.TooManyUnknownMsg);
298 * Handles incoming message. If the session is up, it notifies the user. The user is notified about every message
301 * @param msg incoming message
304 public void handleMessage(final Message msg) {
305 // Update last reception time
306 this.lastMessageReceivedAt = System.nanoTime();
307 this.receivedMsgCount++;
308 if (!(msg instanceof KeepaliveMessage)) {
309 LOG.debug("PCEP message {} received.", msg);
311 // Internal message handling. The user does not see these messages
312 if (msg instanceof KeepaliveMessage) {
313 // Do nothing, the timer has been already reset
314 } else if (msg instanceof OpenMessage) {
315 this.sendErrorMessage(PCEPErrors.ATTEMPT_2ND_SESSION);
316 } else if (msg instanceof CloseMessage) {
318 * Session is up, we are reporting all messages to user. One notable
319 * exception is CLOSE message, which needs to be converted into a
320 * session DOWN event.
324 // This message needs to be handled by the user
325 this.listener.onMessage(this, msg);
330 * @return the sentMsgCount
334 public final Integer getSentMsgCount() {
335 return this.sentMsgCount;
339 * @return the receivedMsgCount
343 public final Integer getReceivedMsgCount() {
344 return this.receivedMsgCount;
348 public final Integer getDeadTimerValue() {
349 return Integer.valueOf(this.remoteOpen.getDeadTimer());
353 public final Integer getKeepAliveTimerValue() {
354 return Integer.valueOf(this.localOpen.getKeepalive());
358 public final String getPeerAddress() {
359 final InetSocketAddress a = (InetSocketAddress) this.channel.remoteAddress();
360 return a.getHostName();
364 public void tearDown() {
369 public final String toString() {
370 return addToStringAttributes(Objects.toStringHelper(this)).toString();
373 protected ToStringHelper addToStringAttributes(final ToStringHelper toStringHelper) {
374 toStringHelper.add("channel", this.channel);
375 toStringHelper.add("localOpen", this.localOpen);
376 toStringHelper.add("remoteOpen", this.remoteOpen);
377 return toStringHelper;
382 public void sessionUp() {
383 this.listener.onSessionUp(this);
387 public String getNodeIdentifier() {