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 static java.util.Objects.requireNonNull;
12 import com.google.common.annotations.VisibleForTesting;
13 import com.google.common.base.MoreObjects;
14 import com.google.common.base.MoreObjects.ToStringHelper;
15 import com.google.common.base.Ticker;
16 import io.netty.channel.Channel;
17 import io.netty.channel.ChannelFuture;
18 import io.netty.channel.ChannelFutureListener;
19 import io.netty.channel.ChannelHandlerContext;
20 import io.netty.channel.SimpleChannelInboundHandler;
21 import io.netty.util.concurrent.Future;
22 import java.io.IOException;
23 import java.net.InetAddress;
24 import java.net.InetSocketAddress;
25 import java.util.Date;
26 import java.util.LinkedList;
27 import java.util.Queue;
28 import java.util.concurrent.TimeUnit;
29 import java.util.concurrent.atomic.AtomicBoolean;
30 import javax.annotation.concurrent.GuardedBy;
31 import org.opendaylight.protocol.pcep.PCEPCloseTermination;
32 import org.opendaylight.protocol.pcep.PCEPSession;
33 import org.opendaylight.protocol.pcep.PCEPSessionListener;
34 import org.opendaylight.protocol.pcep.TerminationReason;
35 import org.opendaylight.protocol.pcep.impl.spi.Util;
36 import org.opendaylight.protocol.pcep.spi.PCEPErrors;
37 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.message.rev131007.CloseBuilder;
38 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.message.rev131007.Keepalive;
39 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.message.rev131007.KeepaliveBuilder;
40 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.stats.rev171113.pcep.session.state.LocalPref;
41 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.stats.rev171113.pcep.session.state.Messages;
42 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.stats.rev171113.pcep.session.state.PeerPref;
43 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.CloseMessage;
44 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.KeepaliveMessage;
45 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.Message;
46 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.OpenMessage;
47 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.PcerrMessage;
48 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.close.message.CCloseMessageBuilder;
49 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.close.object.CCloseBuilder;
50 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.keepalive.message.KeepaliveMessageBuilder;
51 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.open.object.Open;
52 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.open.object.open.Tlvs;
53 import org.slf4j.Logger;
54 import org.slf4j.LoggerFactory;
57 * Implementation of PCEPSession. (Not final for testing.)
60 public class PCEPSessionImpl extends SimpleChannelInboundHandler<Message> implements PCEPSession {
61 private static final long MINUTE = TimeUnit.MINUTES.toNanos(1);
62 private static Ticker TICKER = Ticker.systemTicker();
64 * System.nanoTime value about when was sent the last message Protected to be updated also in tests.
66 private volatile long lastMessageSentAt;
69 * System.nanoTime value about when was received the last message
71 private long lastMessageReceivedAt;
73 private final Queue<Long> unknownMessagesTimes = new LinkedList<>();
75 private final PCEPSessionListener listener;
78 * Open Object with session characteristics that were accepted by another PCE (sent from this session).
80 private final Open localOpen;
83 * Open Object with session characteristics for this session (sent from another PCE).
85 private final Open remoteOpen;
87 private static final Logger LOG = LoggerFactory.getLogger(PCEPSessionImpl.class);
89 private int maxUnknownMessages;
91 // True if the listener should not be notified about events
93 private final AtomicBoolean closed = new AtomicBoolean(false);
95 private final Channel channel;
97 private final Keepalive kaMessage = new KeepaliveBuilder().setKeepaliveMessage(new KeepaliveMessageBuilder().build()).build();
99 private final PCEPSessionState sessionState;
101 PCEPSessionImpl(final PCEPSessionListener listener, final int maxUnknownMessages, final Channel channel,
102 final Open localOpen, final Open remoteOpen) {
103 this.listener = requireNonNull(listener);
104 this.channel = requireNonNull(channel);
105 this.localOpen = requireNonNull(localOpen);
106 this.remoteOpen = requireNonNull(remoteOpen);
107 this.lastMessageReceivedAt = TICKER.read();
109 if (maxUnknownMessages != 0) {
110 this.maxUnknownMessages = maxUnknownMessages;
114 if (getDeadTimerValue() != 0) {
115 channel.eventLoop().schedule(this::handleDeadTimer, getDeadTimerValue(), TimeUnit.SECONDS);
118 if (getKeepAliveTimerValue() != 0) {
119 channel.eventLoop().schedule(this::handleKeepaliveTimer, getKeepAliveTimerValue(), TimeUnit.SECONDS);
122 LOG.info("Session {}[{}] <-> {}[{}] started", channel.localAddress(), localOpen.getSessionId(), channel.remoteAddress(),
123 remoteOpen.getSessionId());
124 this.sessionState = new PCEPSessionState(remoteOpen, localOpen, channel);
127 public final Integer getKeepAliveTimerValue() {
128 return this.localOpen.getKeepalive().intValue();
131 public final Integer getDeadTimerValue() {
132 return this.remoteOpen.getDeadTimer().intValue();
136 * If DeadTimer expires, the session ends. If a message (whichever) was received during this period, the DeadTimer
137 * will be rescheduled by DEAD_TIMER_VALUE + the time that has passed from the start of the DeadTimer to the time at
138 * which the message was received. If the session was closed by the time this method starts to execute (the session
139 * state will become IDLE), that rescheduling won't occur.
141 private synchronized void handleDeadTimer() {
142 final long ct = TICKER.read();
144 final long nextDead = this.lastMessageReceivedAt + TimeUnit.SECONDS.toNanos(getDeadTimerValue());
146 if (this.channel.isActive()) {
147 if (ct >= nextDead) {
148 LOG.debug("DeadTimer expired. {}", new Date());
149 this.terminate(TerminationReason.EXP_DEADTIMER);
151 this.channel.eventLoop().schedule(this::handleDeadTimer, 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 = TICKER.read();
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(this::handleKeepaliveTimer, nextKeepalive - ct, TimeUnit.NANOSECONDS);
178 * Handle exception occurred in the PCEP session. The session in error state should be closed
179 * properly so that it can be restored later.
182 void handleException(final Throwable cause) {
183 LOG.error("Exception captured for session {}, closing session.", this, cause);
184 terminate(TerminationReason.UNKNOWN);
188 * Sends message to serialization.
190 * @param msg to be sent
193 public Future<Void> sendMessage(final Message msg) {
194 final ChannelFuture f = this.channel.writeAndFlush(msg);
195 this.lastMessageSentAt = TICKER.read();
196 this.sessionState.updateLastSentMsg();
197 if (!(msg instanceof KeepaliveMessage)) {
198 LOG.debug("PCEP Message enqueued: {}", msg);
200 if (msg instanceof PcerrMessage) {
201 this.sessionState.setLastSentError(msg);
204 f.addListener((ChannelFutureListener) arg -> {
205 if (arg.isSuccess()) {
206 LOG.trace("Message sent to socket: {}", msg);
208 LOG.debug("Message not sent: {}", msg, arg.cause());
216 ChannelFuture closeChannel() {
217 LOG.info("Closing PCEP session channel: {}", this.channel);
218 return this.channel.close();
222 public synchronized boolean isClosed() {
223 return this.closed.get();
227 * Closes PCEP session without sending a Close message, as the channel is no longer active.
230 public synchronized void close() {
235 * Closes PCEP session, cancels all timers, returns to state Idle, sends the Close Message. KeepAlive and DeadTimer
236 * are cancelled if the state of the session changes to IDLE. This method is used to close the PCEP session from
237 * inside the session or from the listener, therefore the parent of this session should be informed.
240 public synchronized void close(final TerminationReason reason) {
241 if (this.closed.getAndSet(true)) {
242 LOG.debug("Session is already closed.");
245 // only send close message when the reason is provided
246 if (reason != null) {
247 LOG.info("Closing PCEP session with reason {}: {}", reason, this);
248 sendMessage(new CloseBuilder().setCCloseMessage(
249 new CCloseMessageBuilder().setCClose(new CCloseBuilder().setReason(reason.getShortValue()).build()).build()).build());
251 LOG.info("Closing PCEP session: {}", this);
257 public Tlvs getRemoteTlvs() {
258 return this.remoteOpen.getTlvs();
262 public InetAddress getRemoteAddress() {
263 return ((InetSocketAddress) this.channel.remoteAddress()).getAddress();
266 private synchronized void terminate(final TerminationReason reason) {
267 if (this.closed.get()) {
268 LOG.debug("Session {} is already closed.", this);
272 this.listener.onSessionTerminated(this, new PCEPCloseTermination(reason));
275 synchronized void endOfInput() {
276 if (!this.closed.getAndSet(true)) {
277 this.listener.onSessionDown(this, new IOException("End of input detected. Close the session."));
281 private void sendErrorMessage(final PCEPErrors value) {
282 this.sendErrorMessage(value, null);
286 * Sends PCEP Error Message with one PCEPError and Open Object.
291 private void sendErrorMessage(final PCEPErrors value, final Open open) {
292 this.sendMessage(Util.createErrorMessage(value, open));
296 * The fact, that a message is malformed, comes from parser. In case of unrecognized message a particular error is
297 * sent (CAPABILITY_NOT_SUPPORTED) and the method checks if the MAX_UNKNOWN_MSG per minute wasn't overstepped.
298 * Second, any other error occurred that is specified by rfc. In this case, the an error message is generated and
301 * @param error documented error in RFC5440 or draft
304 void handleMalformedMessage(final PCEPErrors error) {
305 final long ct = TICKER.read();
306 this.sendErrorMessage(error);
307 if (error == PCEPErrors.CAPABILITY_NOT_SUPPORTED) {
308 this.unknownMessagesTimes.add(ct);
309 while (ct - this.unknownMessagesTimes.peek() > MINUTE) {
310 final Long poll = this.unknownMessagesTimes.poll();
312 if (this.unknownMessagesTimes.size() > this.maxUnknownMessages) {
313 this.terminate(TerminationReason.TOO_MANY_UNKNOWN_MSGS);
319 * Handles incoming message. If the session is up, it notifies the user. The user is notified about every message
322 * @param msg incoming message
324 public synchronized void handleMessage(final Message msg) {
325 if (this.closed.get()) {
326 LOG.debug("PCEP Session {} is already closed, skip handling incoming message {}", this, msg);
329 // Update last reception time
330 this.lastMessageReceivedAt = TICKER.read();
331 this.sessionState.updateLastReceivedMsg();
332 if (!(msg instanceof KeepaliveMessage)) {
333 LOG.debug("PCEP message {} received.", msg);
335 // Internal message handling. The user does not see these messages
336 if (msg instanceof KeepaliveMessage) {
337 // Do nothing, the timer has been already reset
338 } else if (msg instanceof OpenMessage) {
339 this.sendErrorMessage(PCEPErrors.ATTEMPT_2ND_SESSION);
340 } else if (msg instanceof CloseMessage) {
342 * Session is up, we are reporting all messages to user. One notable
343 * exception is CLOSE message, which needs to be converted into a
344 * session DOWN event.
347 this.listener.onSessionTerminated(this, new PCEPCloseTermination(TerminationReason
348 .forValue(((CloseMessage) msg).getCCloseMessage().getCClose().getReason())));
350 // This message needs to be handled by the user
351 if (msg instanceof PcerrMessage) {
352 this.sessionState.setLastReceivedError(msg);
354 this.listener.onMessage(this, msg);
359 public final String toString() {
360 return addToStringAttributes(MoreObjects.toStringHelper(this)).toString();
363 private ToStringHelper addToStringAttributes(final ToStringHelper toStringHelper) {
364 toStringHelper.add("channel", this.channel);
365 toStringHelper.add("localOpen", this.localOpen);
366 toStringHelper.add("remoteOpen", this.remoteOpen);
367 return toStringHelper;
373 this.listener.onSessionUp(this);
374 } catch (final Exception e) {
381 final Queue<Long> getUnknownMessagesTimes() {
382 return this.unknownMessagesTimes;
386 public Messages getMessages() {
387 return this.sessionState.getMessages(this.unknownMessagesTimes.size());
391 public LocalPref getLocalPref() {
392 return this.sessionState.getLocalPref();
396 public PeerPref getPeerPref() {
397 return this.sessionState.getPeerPref();
401 public Open getLocalOpen() {
402 return this.sessionState.getLocalOpen();
406 public synchronized final void channelInactive(final ChannelHandlerContext ctx) {
407 LOG.debug("Channel {} inactive.", ctx.channel());
411 super.channelInactive(ctx);
412 } catch (final Exception e) {
413 throw new IllegalStateException("Failed to delegate channel inactive event on channel " + ctx.channel(), e);
418 protected synchronized final void channelRead0(final ChannelHandlerContext ctx, final Message msg) {
419 LOG.debug("Message was received: {}", msg);
424 public synchronized final void handlerAdded(final ChannelHandlerContext ctx) {
429 public synchronized void exceptionCaught(final ChannelHandlerContext ctx, final Throwable cause) {
430 handleException(cause);
434 public Tlvs getLocalTlvs() {
435 return this.localOpen.getTlvs();
439 static void setTicker(final Ticker ticker) {