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;
14 import io.netty.channel.Channel;
15 import io.netty.channel.ChannelFuture;
16 import io.netty.channel.ChannelFutureListener;
17 import io.netty.util.concurrent.Future;
18 import java.io.IOException;
19 import java.net.InetAddress;
20 import java.net.InetSocketAddress;
21 import java.util.Date;
22 import java.util.LinkedList;
23 import java.util.Queue;
24 import java.util.concurrent.TimeUnit;
25 import org.opendaylight.protocol.framework.AbstractProtocolSession;
26 import org.opendaylight.protocol.pcep.PCEPCloseTermination;
27 import org.opendaylight.protocol.pcep.PCEPSession;
28 import org.opendaylight.protocol.pcep.PCEPSessionListener;
29 import org.opendaylight.protocol.pcep.TerminationReason;
30 import org.opendaylight.protocol.pcep.spi.PCEPErrors;
31 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.message.rev131007.CloseBuilder;
32 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.message.rev131007.Keepalive;
33 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.message.rev131007.KeepaliveBuilder;
34 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.CloseMessage;
35 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.KeepaliveMessage;
36 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.Message;
37 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.OpenMessage;
38 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.close.message.CCloseMessageBuilder;
39 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.close.object.CCloseBuilder;
40 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.keepalive.message.KeepaliveMessageBuilder;
41 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.open.object.Open;
42 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.open.object.open.Tlvs;
43 import org.slf4j.Logger;
44 import org.slf4j.LoggerFactory;
47 * Implementation of PCEPSession. (Not final for testing.)
50 public class PCEPSessionImpl extends AbstractProtocolSession<Message> implements PCEPSession, PCEPSessionRuntimeMXBean {
52 * System.nanoTime value about when was sent the last message Protected to be updated also in tests.
55 protected volatile long lastMessageSentAt;
58 * System.nanoTime value about when was received the last message
60 private long lastMessageReceivedAt;
62 private final Queue<Long> unknownMessagesTimes = new LinkedList<Long>();
64 private final PCEPSessionListener listener;
67 * Open Object with session characteristics that were accepted by another PCE (sent from this session).
69 private final Open localOpen;
72 * Open Object with session characteristics for this session (sent from another PCE).
74 private final Open remoteOpen;
76 private static final Logger LOG = LoggerFactory.getLogger(PCEPSessionImpl.class);
78 private int sentMsgCount = 0;
80 private int receivedMsgCount = 0;
82 private int maxUnknownMessages;
84 // True if the listener should not be notified about events
85 private boolean closed = false;
87 private final Channel channel;
89 private final Keepalive kaMessage = new KeepaliveBuilder().setKeepaliveMessage(new KeepaliveMessageBuilder().build()).build();
91 PCEPSessionImpl(final PCEPSessionListener listener, final int maxUnknownMessages, final Channel channel,
92 final Open localOpen, final Open remoteOpen) {
93 this.listener = Preconditions.checkNotNull(listener);
94 this.channel = Preconditions.checkNotNull(channel);
95 this.localOpen = Preconditions.checkNotNull(localOpen);
96 this.remoteOpen = Preconditions.checkNotNull(remoteOpen);
97 this.lastMessageReceivedAt = System.nanoTime();
99 if (maxUnknownMessages != 0) {
100 this.maxUnknownMessages = maxUnknownMessages;
104 if (getDeadTimerValue() != 0) {
105 channel.eventLoop().schedule(new Runnable() {
110 }, getDeadTimerValue(), TimeUnit.SECONDS);
113 if (getKeepAliveTimerValue() != 0) {
114 channel.eventLoop().schedule(new Runnable() {
117 handleKeepaliveTimer();
119 }, getKeepAliveTimerValue(), TimeUnit.SECONDS);
122 LOG.info("Session {}[{}] <-> {}[{}] started", channel.localAddress(), localOpen.getSessionId(), channel.remoteAddress(),
123 remoteOpen.getSessionId());
127 * If DeadTimer expires, the session ends. If a message (whichever) was received during this period, the DeadTimer
128 * will be rescheduled by DEAD_TIMER_VALUE + the time that has passed from the start of the DeadTimer to the time at
129 * which the message was received. If the session was closed by the time this method starts to execute (the session
130 * state will become IDLE), that rescheduling won't occur.
132 private synchronized void handleDeadTimer() {
133 final long ct = System.nanoTime();
135 final long nextDead = this.lastMessageReceivedAt + TimeUnit.SECONDS.toNanos(getDeadTimerValue());
137 if (this.channel.isActive()) {
138 if (ct >= nextDead) {
139 LOG.debug("DeadTimer expired. {}", new Date());
140 this.terminate(TerminationReason.ExpDeadtimer);
142 this.channel.eventLoop().schedule(new Runnable() {
147 }, nextDead - ct, TimeUnit.NANOSECONDS);
153 * If KeepAlive Timer expires, sends KeepAlive message. If a message (whichever) was send during this period, the
154 * KeepAlive Timer will be rescheduled by KEEP_ALIVE_TIMER_VALUE + the time that has passed from the start of the
155 * KeepAlive timer to the time at which the message was sent. If the session was closed by the time this method
156 * starts to execute (the session state will become IDLE), that rescheduling won't occur.
158 private void handleKeepaliveTimer() {
159 final long ct = System.nanoTime();
161 long nextKeepalive = this.lastMessageSentAt + TimeUnit.SECONDS.toNanos(getKeepAliveTimerValue());
163 if (this.channel.isActive()) {
164 if (ct >= nextKeepalive) {
165 this.sendMessage(this.kaMessage);
166 nextKeepalive = this.lastMessageSentAt + TimeUnit.SECONDS.toNanos(getKeepAliveTimerValue());
169 this.channel.eventLoop().schedule(new Runnable() {
172 handleKeepaliveTimer();
174 }, nextKeepalive - ct, TimeUnit.NANOSECONDS);
179 * Sends message to serialization.
181 * @param msg to be sent
184 public Future<Void> sendMessage(final Message msg) {
185 final ChannelFuture f = this.channel.writeAndFlush(msg);
186 this.lastMessageSentAt = System.nanoTime();
187 if (!(msg instanceof KeepaliveMessage)) {
188 LOG.debug("PCEP Message enqueued: {}", msg);
192 f.addListener(new ChannelFutureListener() {
194 public void operationComplete(final ChannelFuture arg) {
195 if (arg.isSuccess()) {
196 LOG.trace("Message sent to socket: {}", msg);
198 LOG.debug("Message not sent: {}", msg, arg.cause());
207 * Closes PCEP session without sending a Close message, as the channel is no longer active.
210 public void close() {
211 LOG.info("Closing PCEP session: {}", this);
212 this.channel.close();
216 * Closes PCEP session, cancels all timers, returns to state Idle, sends the Close Message. KeepAlive and DeadTimer
217 * are cancelled if the state of the session changes to IDLE. This method is used to close the PCEP session from
218 * inside the session or from the listener, therefore the parent of this session should be informed.
221 public synchronized void close(final TerminationReason reason) {
222 LOG.info("Closing PCEP session: {}", this);
224 this.sendMessage(new CloseBuilder().setCCloseMessage(
225 new CCloseMessageBuilder().setCClose(new CCloseBuilder().setReason(reason.getShortValue()).build()).build()).build());
226 this.channel.close();
230 public Tlvs getRemoteTlvs() {
231 return this.remoteOpen.getTlvs();
235 public InetAddress getRemoteAddress() {
236 return ((InetSocketAddress) this.channel.remoteAddress()).getAddress();
239 private synchronized void terminate(final TerminationReason reason) {
240 LOG.info("Local PCEP session termination : {}", reason);
241 this.listener.onSessionTerminated(this, new PCEPCloseTermination(reason));
243 this.sendMessage(new CloseBuilder().setCCloseMessage(
244 new CCloseMessageBuilder().setCClose(new CCloseBuilder().setReason(reason.getShortValue()).build()).build()).build());
249 public synchronized void endOfInput() {
251 this.listener.onSessionDown(this, new IOException("End of input detected. Close the session."));
256 private void sendErrorMessage(final PCEPErrors value) {
257 this.sendErrorMessage(value, null);
261 * Sends PCEP Error Message with one PCEPError and Open Object.
266 private void sendErrorMessage(final PCEPErrors value, final Open open) {
267 this.sendMessage(Util.createErrorMessage(value, open));
271 * The fact, that a message is malformed, comes from parser. In case of unrecognized message a particular error is
272 * sent (CAPABILITY_NOT_SUPPORTED) and the method checks if the MAX_UNKNOWN_MSG per minute wasn't overstepped.
273 * Second, any other error occurred that is specified by rfc. In this case, the an error message is generated and
276 * @param error documented error in RFC5440 or draft
279 public void handleMalformedMessage(final PCEPErrors error) {
280 final long ct = System.nanoTime();
281 this.sendErrorMessage(error);
282 if (error == PCEPErrors.CAPABILITY_NOT_SUPPORTED) {
283 this.unknownMessagesTimes.add(ct);
284 while (ct - this.unknownMessagesTimes.peek() > 60 * 1E9) {
285 this.unknownMessagesTimes.poll();
287 if (this.unknownMessagesTimes.size() > this.maxUnknownMessages) {
288 this.terminate(TerminationReason.TooManyUnknownMsg);
294 * Handles incoming message. If the session is up, it notifies the user. The user is notified about every message
297 * @param msg incoming message
300 public synchronized void handleMessage(final Message msg) {
301 // Update last reception time
302 this.lastMessageReceivedAt = System.nanoTime();
303 this.receivedMsgCount++;
304 if (!(msg instanceof KeepaliveMessage)) {
305 LOG.debug("PCEP message {} received.", msg);
307 // Internal message handling. The user does not see these messages
308 if (msg instanceof KeepaliveMessage) {
309 // Do nothing, the timer has been already reset
310 } else if (msg instanceof OpenMessage) {
311 this.sendErrorMessage(PCEPErrors.ATTEMPT_2ND_SESSION);
312 } else if (msg instanceof CloseMessage) {
314 * Session is up, we are reporting all messages to user. One notable
315 * exception is CLOSE message, which needs to be converted into a
316 * session DOWN event.
320 // This message needs to be handled by the user
321 this.listener.onMessage(this, msg);
326 * @return the sentMsgCount
330 public final Integer getSentMsgCount() {
331 return this.sentMsgCount;
335 * @return the receivedMsgCount
339 public final Integer getReceivedMsgCount() {
340 return this.receivedMsgCount;
344 public final Integer getDeadTimerValue() {
345 return Integer.valueOf(this.remoteOpen.getDeadTimer());
349 public final Integer getKeepAliveTimerValue() {
350 return Integer.valueOf(this.localOpen.getKeepalive());
354 public final String getPeerAddress() {
355 final InetSocketAddress a = (InetSocketAddress) this.channel.remoteAddress();
356 return a.getHostName();
360 public void tearDown() {
365 public final String toString() {
366 return addToStringAttributes(Objects.toStringHelper(this)).toString();
369 protected ToStringHelper addToStringAttributes(final ToStringHelper toStringHelper) {
370 toStringHelper.add("channel", this.channel);
371 toStringHelper.add("localOpen", this.localOpen);
372 toStringHelper.add("remoteOpen", this.remoteOpen);
373 return toStringHelper;
378 public void sessionUp() {
379 this.listener.onSessionUp(this);
383 public String getNodeIdentifier() {
388 protected final Queue<Long> getUnknownMessagesTimes() {
389 return this.unknownMessagesTimes;