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;
63 protected final Queue<Long> unknownMessagesTimes = new LinkedList<Long>();
65 private final PCEPSessionListener listener;
68 * Open Object with session characteristics that were accepted by another PCE (sent from this session).
70 private final Open localOpen;
73 * Open Object with session characteristics for this session (sent from another PCE).
75 private final Open remoteOpen;
77 private static final Logger LOG = LoggerFactory.getLogger(PCEPSessionImpl.class);
79 private int sentMsgCount = 0;
81 private int receivedMsgCount = 0;
83 private int maxUnknownMessages;
85 // True if the listener should not be notified about events
86 private boolean closed = false;
88 private final Channel channel;
90 private final Keepalive kaMessage = new KeepaliveBuilder().setKeepaliveMessage(new KeepaliveMessageBuilder().build()).build();
92 PCEPSessionImpl(final PCEPSessionListener listener, final int maxUnknownMessages, final Channel channel,
93 final Open localOpen, final Open remoteOpen) {
94 this.listener = Preconditions.checkNotNull(listener);
95 this.channel = Preconditions.checkNotNull(channel);
96 this.localOpen = Preconditions.checkNotNull(localOpen);
97 this.remoteOpen = Preconditions.checkNotNull(remoteOpen);
98 this.lastMessageReceivedAt = System.nanoTime();
100 if (maxUnknownMessages != 0) {
101 this.maxUnknownMessages = maxUnknownMessages;
105 if (getDeadTimerValue() != 0) {
106 channel.eventLoop().schedule(new Runnable() {
111 }, getDeadTimerValue(), TimeUnit.SECONDS);
114 if (getKeepAliveTimerValue() != 0) {
115 channel.eventLoop().schedule(new Runnable() {
118 handleKeepaliveTimer();
120 }, getKeepAliveTimerValue(), TimeUnit.SECONDS);
123 LOG.info("Session {}[{}] <-> {}[{}] started", channel.localAddress(), localOpen.getSessionId(), channel.remoteAddress(),
124 remoteOpen.getSessionId());
128 * If DeadTimer expires, the session ends. If a message (whichever) was received during this period, the DeadTimer
129 * will be rescheduled by DEAD_TIMER_VALUE + the time that has passed from the start of the DeadTimer to the time at
130 * which the message was received. If the session was closed by the time this method starts to execute (the session
131 * state will become IDLE), that rescheduling won't occur.
133 private synchronized void handleDeadTimer() {
134 final long ct = System.nanoTime();
136 final long nextDead = this.lastMessageReceivedAt + TimeUnit.SECONDS.toNanos(getDeadTimerValue());
138 if (this.channel.isActive()) {
139 if (ct >= nextDead) {
140 LOG.debug("DeadTimer expired. {}", new Date());
141 this.terminate(TerminationReason.ExpDeadtimer);
143 this.channel.eventLoop().schedule(new Runnable() {
148 }, nextDead - ct, TimeUnit.NANOSECONDS);
154 * If KeepAlive Timer expires, sends KeepAlive message. If a message (whichever) was send during this period, the
155 * KeepAlive Timer will be rescheduled by KEEP_ALIVE_TIMER_VALUE + the time that has passed from the start of the
156 * KeepAlive timer to the time at which the message was sent. If the session was closed by the time this method
157 * starts to execute (the session state will become IDLE), that rescheduling won't occur.
159 private void handleKeepaliveTimer() {
160 final long ct = System.nanoTime();
162 long nextKeepalive = this.lastMessageSentAt + TimeUnit.SECONDS.toNanos(getKeepAliveTimerValue());
164 if (this.channel.isActive()) {
165 if (ct >= nextKeepalive) {
166 this.sendMessage(this.kaMessage);
167 nextKeepalive = this.lastMessageSentAt + TimeUnit.SECONDS.toNanos(getKeepAliveTimerValue());
170 this.channel.eventLoop().schedule(new Runnable() {
173 handleKeepaliveTimer();
175 }, nextKeepalive - ct, TimeUnit.NANOSECONDS);
180 * Sends message to serialization.
182 * @param msg to be sent
185 public Future<Void> sendMessage(final Message msg) {
186 final ChannelFuture f = this.channel.writeAndFlush(msg);
187 this.lastMessageSentAt = System.nanoTime();
188 if (!(msg instanceof KeepaliveMessage)) {
189 LOG.debug("PCEP Message enqueued: {}", msg);
193 f.addListener(new ChannelFutureListener() {
195 public void operationComplete(final ChannelFuture arg) {
196 if (arg.isSuccess()) {
197 LOG.trace("Message sent to socket: {}", msg);
199 LOG.debug("Message not sent: {}", msg, arg.cause());
208 * Closes PCEP session without sending a Close message, as the channel is no longer active.
211 public void close() {
212 LOG.info("Closing PCEP session: {}", this);
213 this.channel.close();
217 * Closes PCEP session, cancels all timers, returns to state Idle, sends the Close Message. KeepAlive and DeadTimer
218 * are cancelled if the state of the session changes to IDLE. This method is used to close the PCEP session from
219 * inside the session or from the listener, therefore the parent of this session should be informed.
222 public synchronized void close(final TerminationReason reason) {
223 LOG.info("Closing PCEP session: {}", this);
225 this.sendMessage(new CloseBuilder().setCCloseMessage(
226 new CCloseMessageBuilder().setCClose(new CCloseBuilder().setReason(reason.getShortValue()).build()).build()).build());
227 this.channel.close();
231 public Tlvs getRemoteTlvs() {
232 return this.remoteOpen.getTlvs();
236 public InetAddress getRemoteAddress() {
237 return ((InetSocketAddress) this.channel.remoteAddress()).getAddress();
240 private synchronized void terminate(final TerminationReason reason) {
241 LOG.info("Local PCEP session termination : {}", reason);
242 this.listener.onSessionTerminated(this, new PCEPCloseTermination(reason));
244 this.sendMessage(new CloseBuilder().setCCloseMessage(
245 new CCloseMessageBuilder().setCClose(new CCloseBuilder().setReason(reason.getShortValue()).build()).build()).build());
250 public synchronized void endOfInput() {
252 this.listener.onSessionDown(this, new IOException("End of input detected. Close the session."));
257 private void sendErrorMessage(final PCEPErrors value) {
258 this.sendErrorMessage(value, null);
262 * Sends PCEP Error Message with one PCEPError and Open Object.
267 private void sendErrorMessage(final PCEPErrors value, final Open open) {
268 this.sendMessage(Util.createErrorMessage(value, open));
272 * The fact, that a message is malformed, comes from parser. In case of unrecognized message a particular error is
273 * sent (CAPABILITY_NOT_SUPPORTED) and the method checks if the MAX_UNKNOWN_MSG per minute wasn't overstepped.
274 * Second, any other error occurred that is specified by rfc. In this case, the an error message is generated and
277 * @param error documented error in RFC5440 or draft
280 public void handleMalformedMessage(final PCEPErrors error) {
281 final long ct = System.nanoTime();
282 this.sendErrorMessage(error);
283 if (error == PCEPErrors.CAPABILITY_NOT_SUPPORTED) {
284 this.unknownMessagesTimes.add(ct);
285 while (ct - this.unknownMessagesTimes.peek() > 60 * 1E9) {
286 this.unknownMessagesTimes.poll();
288 if (this.unknownMessagesTimes.size() > this.maxUnknownMessages) {
289 this.terminate(TerminationReason.TooManyUnknownMsg);
295 * Handles incoming message. If the session is up, it notifies the user. The user is notified about every message
298 * @param msg incoming message
301 public synchronized void handleMessage(final Message msg) {
302 // Update last reception time
303 this.lastMessageReceivedAt = System.nanoTime();
304 this.receivedMsgCount++;
305 if (!(msg instanceof KeepaliveMessage)) {
306 LOG.debug("PCEP message {} received.", msg);
308 // Internal message handling. The user does not see these messages
309 if (msg instanceof KeepaliveMessage) {
310 // Do nothing, the timer has been already reset
311 } else if (msg instanceof OpenMessage) {
312 this.sendErrorMessage(PCEPErrors.ATTEMPT_2ND_SESSION);
313 } else if (msg instanceof CloseMessage) {
315 * Session is up, we are reporting all messages to user. One notable
316 * exception is CLOSE message, which needs to be converted into a
317 * session DOWN event.
321 // This message needs to be handled by the user
322 this.listener.onMessage(this, msg);
327 * @return the sentMsgCount
331 public final Integer getSentMsgCount() {
332 return this.sentMsgCount;
336 * @return the receivedMsgCount
340 public final Integer getReceivedMsgCount() {
341 return this.receivedMsgCount;
345 public final Integer getDeadTimerValue() {
346 return Integer.valueOf(this.remoteOpen.getDeadTimer());
350 public final Integer getKeepAliveTimerValue() {
351 return Integer.valueOf(this.localOpen.getKeepalive());
355 public final String getPeerAddress() {
356 final InetSocketAddress a = (InetSocketAddress) this.channel.remoteAddress();
357 return a.getHostName();
361 public void tearDown() {
366 public final String toString() {
367 return addToStringAttributes(Objects.toStringHelper(this)).toString();
370 protected ToStringHelper addToStringAttributes(final ToStringHelper toStringHelper) {
371 toStringHelper.add("channel", this.channel);
372 toStringHelper.add("localOpen", this.localOpen);
373 toStringHelper.add("remoteOpen", this.remoteOpen);
374 return toStringHelper;
379 public void sessionUp() {
380 this.listener.onSessionUp(this);
384 public String getNodeIdentifier() {