*/
package org.opendaylight.protocol.bgp.rib.impl;
+import com.google.common.annotations.VisibleForTesting;
+import com.google.common.base.MoreObjects;
+import com.google.common.base.MoreObjects.ToStringHelper;
+import com.google.common.base.Optional;
+import com.google.common.base.Preconditions;
+import com.google.common.collect.Lists;
+import com.google.common.collect.Sets;
import io.netty.channel.Channel;
-import io.netty.util.Timeout;
-import io.netty.util.Timer;
-import io.netty.util.TimerTask;
-
+import io.netty.channel.ChannelFuture;
+import io.netty.channel.ChannelFutureListener;
+import io.netty.channel.ChannelHandlerContext;
+import io.netty.channel.ChannelPipeline;
+import io.netty.channel.SimpleChannelInboundHandler;
import java.io.IOException;
+import java.nio.channels.NonWritableChannelException;
import java.util.Date;
+import java.util.List;
import java.util.Set;
import java.util.concurrent.TimeUnit;
-
import javax.annotation.concurrent.GuardedBy;
-
+import org.opendaylight.controller.config.yang.bgp.rib.impl.BgpSessionState;
+import org.opendaylight.protocol.bgp.parser.AsNumberUtil;
+import org.opendaylight.protocol.bgp.parser.BGPDocumentedException;
import org.opendaylight.protocol.bgp.parser.BGPError;
-import org.opendaylight.protocol.bgp.parser.BGPSession;
-import org.opendaylight.protocol.bgp.parser.BGPSessionListener;
-import org.opendaylight.protocol.bgp.parser.BGPTerminationReason;
+import org.opendaylight.protocol.bgp.parser.BgpExtendedMessageUtil;
import org.opendaylight.protocol.bgp.parser.BgpTableTypeImpl;
-import org.opendaylight.protocol.framework.AbstractProtocolSession;
+import org.opendaylight.protocol.bgp.parser.spi.MultiPathSupport;
+import org.opendaylight.protocol.bgp.parser.spi.pojo.MultiPathSupportImpl;
+import org.opendaylight.protocol.bgp.rib.impl.spi.BGPPeerRegistry;
+import org.opendaylight.protocol.bgp.rib.impl.spi.BGPSessionPreferences;
+import org.opendaylight.protocol.bgp.rib.impl.spi.BGPSessionStatistics;
+import org.opendaylight.protocol.bgp.rib.spi.BGPSession;
+import org.opendaylight.protocol.bgp.rib.spi.BGPSessionListener;
+import org.opendaylight.protocol.bgp.rib.spi.BGPTerminationReason;
+import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev130715.AsNumber;
+import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev130715.Ipv4Address;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev130919.Keepalive;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev130919.KeepaliveBuilder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev130919.Notify;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev130919.NotifyBuilder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev130919.Open;
-import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev130919.open.BgpParameters;
-import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev130919.open.bgp.parameters.CParameters;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev130919.Update;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev130919.open.message.BgpParameters;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev130919.open.message.bgp.parameters.OptionalCapabilities;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev130919.open.message.bgp.parameters.optional.capabilities.CParameters;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev130919.BgpTableType;
-import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev130919.open.bgp.parameters.c.parameters.CMultiprotocol;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev130919.CParameters1;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev130919.RouteRefresh;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev130919.mp.capabilities.AddPathCapability;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev130919.mp.capabilities.MultiprotocolCapability;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev130919.mp.capabilities.add.path.capability.AddressFamilies;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.rib.rev130925.rib.TablesKey;
import org.opendaylight.yangtools.yang.binding.Notification;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
-import com.google.common.annotations.VisibleForTesting;
-import com.google.common.base.Objects;
-import com.google.common.base.Objects.ToStringHelper;
-import com.google.common.base.Preconditions;
-import com.google.common.collect.Sets;
-
@VisibleForTesting
-public class BGPSessionImpl extends AbstractProtocolSession<Notification> implements BGPSession {
-
- private static final Logger logger = LoggerFactory.getLogger(BGPSessionImpl.class);
-
- /*
- * 240
- */
- private static final int DEFAULT_HOLD_TIMER_VALUE = 15;
-
- private static final Notification keepalive = new KeepaliveBuilder().build();
-
- private static int holdTimerValue = DEFAULT_HOLD_TIMER_VALUE;
-
- /**
- * Internal session state.
- */
- public enum State {
- /**
- * The session object is created by the negotiator in OpenConfirm state. While in this state, the session object
- * is half-alive, e.g. the timers are running, but the session is not completely up, e.g. it has not been
- * announced to the listener. If the session is torn down in this state, we do not inform the listener.
- */
- OpenConfirm,
- /**
- * The session has been completely established.
- */
- Up,
- /**
- * The session has been closed. It will not be resurrected.
- */
- Idle,
- }
-
- /**
- * System.nanoTime value about when was sent the last message Protected to be updated also in tests.
- */
- @VisibleForTesting
- protected long lastMessageSentAt;
-
- /**
- * System.nanoTime value about when was received the last message
- */
- private long lastMessageReceivedAt;
-
- private final BGPSessionListener listener;
-
- /**
- * Timer object grouping FSM Timers
- */
- private final Timer stateTimer;
-
- private final BGPSynchronization sync;
-
- private int kaCounter = 0;
-
- private final Channel channel;
-
- @GuardedBy("this")
- private State state = State.OpenConfirm;
-
- private final int keepAlive;
-
- private final Set<BgpTableType> tableTypes;
-
- BGPSessionImpl(final Timer timer, final BGPSessionListener listener, final Channel channel, final Open remoteOpen) {
- this.listener = Preconditions.checkNotNull(listener);
- this.stateTimer = Preconditions.checkNotNull(timer);
- this.channel = Preconditions.checkNotNull(channel);
- this.keepAlive = remoteOpen.getHoldTimer() / 3;
- holdTimerValue = remoteOpen.getHoldTimer();
-
- final Set<TablesKey> tts = Sets.newHashSet();
- final Set<BgpTableType> tats = Sets.newHashSet();
- if (remoteOpen.getBgpParameters() != null) {
- for (final BgpParameters param : remoteOpen.getBgpParameters()) {
- if (param instanceof CParameters) {
- final CParameters cp = (CParameters) param;
- final TablesKey tt = new TablesKey(((CMultiprotocol) cp).getMultiprotocolCapability().getAfi(), ((CMultiprotocol) cp).getMultiprotocolCapability().getSafi());
- tts.add(tt);
- tats.add(new BgpTableTypeImpl(tt.getAfi(), tt.getSafi()));
- }
- }
- }
-
- this.sync = new BGPSynchronization(this, this.listener, tts);
- this.tableTypes = tats;
-
- if (remoteOpen.getHoldTimer() != 0) {
- this.stateTimer.newTimeout(new TimerTask() {
-
- @Override
- public void run(final Timeout timeout) throws Exception {
- handleHoldTimer();
- }
- }, remoteOpen.getHoldTimer(), TimeUnit.SECONDS);
-
- this.stateTimer.newTimeout(new TimerTask() {
- @Override
- public void run(final Timeout timeout) throws Exception {
- handleKeepaliveTimer();
- }
- }, this.keepAlive, TimeUnit.SECONDS);
- }
- }
-
- @Override
- public synchronized void close() {
- logger.debug("Closing session: {}", this);
- if (this.state != State.Idle) {
- this.sendMessage(new NotifyBuilder().setErrorCode(BGPError.CEASE.getCode()).build());
- this.channel.close();
- this.state = State.Idle;
- }
- }
-
- /**
- * Handles incoming message based on their type.
- *
- * @param msg incoming message
- */
- @Override
- public void handleMessage(final Notification msg) {
- // Update last reception time
- this.lastMessageReceivedAt = System.nanoTime();
-
- if (msg instanceof Open) {
- // Open messages should not be present here
- this.terminate(BGPError.FSM_ERROR);
- } else if (msg instanceof Notify) {
- // Notifications are handled internally
- logger.info("Session closed because Notification message received: {} / {}", ((Notify) msg).getErrorCode(),
- ((Notify) msg).getErrorSubcode());
- this.closeWithoutMessage();
- this.listener.onSessionTerminated(this,
- new BGPTerminationReason(BGPError.forValue(((Notify) msg).getErrorCode(), ((Notify) msg).getErrorSubcode())));
- } else if (msg instanceof Keepalive) {
- // Keepalives are handled internally
- logger.debug("Received KeepAlive messsage.");
- this.kaCounter++;
- if (this.kaCounter >= 2) {
- this.sync.kaReceived();
- }
- } else {
- // All others are passed up
- this.listener.onMessage(this, msg);
- }
- }
-
- @Override
- public synchronized void endOfInput() {
- if (this.state == State.Up) {
- this.listener.onSessionDown(this, new IOException("End of input detected. Close the session."));
- }
- }
-
- void sendMessage(final Notification msg) {
- try {
- this.channel.writeAndFlush(msg);
- this.lastMessageSentAt = System.nanoTime();
- logger.debug("Sent message: {}", msg);
- } catch (final Exception e) {
- logger.warn("Message {} was not sent.", msg, e);
- }
- }
-
- private synchronized void closeWithoutMessage() {
- logger.debug("Closing session: {}", this);
- this.channel.close();
- this.state = State.Idle;
- }
-
- /**
- * Closes PCEP session from the parent with given reason. A message needs to be sent, but parent doesn't have to be
- * modified, because he initiated the closing. (To prevent concurrent modification exception).
- *
- * @param closeObject
- */
- private void terminate(final BGPError error) {
- this.sendMessage(new NotifyBuilder().setErrorCode(error.getCode()).setErrorSubcode(error.getSubcode()).build());
- this.closeWithoutMessage();
-
- this.listener.onSessionTerminated(this, new BGPTerminationReason(error));
- }
-
- /**
- * If HoldTimer expires, the session ends. If a message (whichever) was received during this period, the HoldTimer
- * will be rescheduled by HOLD_TIMER_VALUE + the time that has passed from the start of the HoldTimer to the time at
- * which the message was received. If the session was closed by the time this method starts to execute (the session
- * state will become IDLE), then rescheduling won't occur.
- */
- private synchronized void handleHoldTimer() {
- if (this.state == State.Idle) {
- return;
- }
-
- final long ct = System.nanoTime();
- final long nextHold = this.lastMessageReceivedAt + TimeUnit.SECONDS.toNanos(holdTimerValue);
-
- if (ct >= nextHold) {
- logger.debug("HoldTimer expired. " + new Date());
- this.terminate(BGPError.HOLD_TIMER_EXPIRED);
- } else {
- this.stateTimer.newTimeout(new TimerTask() {
- @Override
- public void run(final Timeout timeout) throws Exception {
- handleHoldTimer();
- }
- }, nextHold - ct, TimeUnit.NANOSECONDS);
- }
- }
-
- /**
- * If KeepAlive Timer expires, sends KeepAlive message. If a message (whichever) was send during this period, the
- * KeepAlive Timer will be rescheduled by KEEP_ALIVE_TIMER_VALUE + the time that has passed from the start of the
- * KeepAlive timer to the time at which the message was sent. If the session was closed by the time this method
- * starts to execute (the session state will become IDLE), that rescheduling won't occur.
- */
- private synchronized void handleKeepaliveTimer() {
- if (this.state == State.Idle) {
- return;
- }
-
- final long ct = System.nanoTime();
- long nextKeepalive = this.lastMessageSentAt + TimeUnit.SECONDS.toNanos(this.keepAlive);
-
- if (ct >= nextKeepalive) {
- this.sendMessage(keepalive);
- nextKeepalive = this.lastMessageSentAt + TimeUnit.SECONDS.toNanos(this.keepAlive);
- }
- this.stateTimer.newTimeout(new TimerTask() {
- @Override
- public void run(final Timeout timeout) throws Exception {
- handleKeepaliveTimer();
- }
- }, nextKeepalive - ct, TimeUnit.NANOSECONDS);
- }
-
- @Override
- public final String toString() {
- return addToStringAttributes(Objects.toStringHelper(this)).toString();
- }
-
- protected ToStringHelper addToStringAttributes(final ToStringHelper toStringHelper) {
- toStringHelper.add("channel", this.channel);
- toStringHelper.add("state", this.state);
- return toStringHelper;
- }
-
- @Override
- public Set<BgpTableType> getAdvertisedTableTypes() {
- return this.tableTypes;
- }
-
- @Override
- protected synchronized void sessionUp() {
- this.state = State.Up;
- this.listener.onSessionUp(this);
- }
-
- public synchronized State getState() {
- return this.state;
- }
+public class BGPSessionImpl extends SimpleChannelInboundHandler<Notification> implements BGPSession, BGPSessionStatistics, AutoCloseable {
+
+ private static final Logger LOG = LoggerFactory.getLogger(BGPSessionImpl.class);
+
+ private static final Notification KEEP_ALIVE = new KeepaliveBuilder().build();
+
+ private static final int KA_TO_DEADTIMER_RATIO = 3;
+
+ private static final String EXTENDED_MSG_DECODER = "EXTENDED_MSG_DECODER";
+
+ static final String END_OF_INPUT = "End of input detected. Close the session.";
+
+ /**
+ * Internal session state.
+ */
+ public enum State {
+ /**
+ * The session object is created by the negotiator in OpenConfirm state. While in this state, the session object
+ * is half-alive, e.g. the timers are running, but the session is not completely up, e.g. it has not been
+ * announced to the listener. If the session is torn down in this state, we do not inform the listener.
+ */
+ OPEN_CONFIRM,
+ /**
+ * The session has been completely established.
+ */
+ UP,
+ /**
+ * The session has been closed. It will not be resurrected.
+ */
+ IDLE,
+ }
+
+ /**
+ * System.nanoTime value about when was sent the last message.
+ */
+ @VisibleForTesting
+ private long lastMessageSentAt;
+
+ /**
+ * System.nanoTime value about when was received the last message
+ */
+ private long lastMessageReceivedAt;
+
+ private final BGPSessionListener listener;
+
+ private final BGPSynchronization sync;
+
+ private int kaCounter = 0;
+
+ private final Channel channel;
+
+ @GuardedBy("this")
+ private State state = State.OPEN_CONFIRM;
+
+ private final Set<BgpTableType> tableTypes;
+ private final List<AddressFamilies> addPathTypes;
+ private final int holdTimerValue;
+ private final int keepAlive;
+ private final AsNumber asNumber;
+ private final Ipv4Address bgpId;
+ private final BGPPeerRegistry peerRegistry;
+ private final ChannelOutputLimiter limiter;
+
+ private BGPSessionStats sessionStats;
+
+ public BGPSessionImpl(final BGPSessionListener listener, final Channel channel, final Open remoteOpen, final BGPSessionPreferences localPreferences,
+ final BGPPeerRegistry peerRegistry) {
+ this(listener, channel, remoteOpen, localPreferences.getHoldTime(), peerRegistry);
+ this.sessionStats = new BGPSessionStats(remoteOpen, this.holdTimerValue, this.keepAlive, channel, Optional.of(localPreferences), this.tableTypes, this.addPathTypes);
+ }
+
+ public BGPSessionImpl(final BGPSessionListener listener, final Channel channel, final Open remoteOpen, final int localHoldTimer,
+ final BGPPeerRegistry peerRegistry) {
+ this.listener = Preconditions.checkNotNull(listener);
+ this.channel = Preconditions.checkNotNull(channel);
+ this.limiter = new ChannelOutputLimiter(this);
+ this.channel.pipeline().addLast(this.limiter);
+ this.holdTimerValue = (remoteOpen.getHoldTimer() < localHoldTimer) ? remoteOpen.getHoldTimer() : localHoldTimer;
+ LOG.info("BGP HoldTimer new value: {}", this.holdTimerValue);
+ this.keepAlive = this.holdTimerValue / KA_TO_DEADTIMER_RATIO;
+ this.asNumber = AsNumberUtil.advertizedAsNumber(remoteOpen);
+ this.peerRegistry = peerRegistry;
+ final boolean enableExMess = BgpExtendedMessageUtil.advertizedBgpExtendedMessageCapability(remoteOpen);
+ if (enableExMess) {
+ this.channel.pipeline().replace(BGPMessageHeaderDecoder.class, EXTENDED_MSG_DECODER, BGPMessageHeaderDecoder.getExtendedBGPMessageHeaderDecoder());
+ }
+
+ final Set<TablesKey> tts = Sets.newHashSet();
+ final Set<BgpTableType> tats = Sets.newHashSet();
+ final List<AddressFamilies> addPathCapabilitiesList = Lists.newArrayList();
+ if (remoteOpen.getBgpParameters() != null) {
+ for (final BgpParameters param : remoteOpen.getBgpParameters()) {
+ for (final OptionalCapabilities optCapa : param.getOptionalCapabilities()) {
+ final CParameters cParam = optCapa.getCParameters();
+ if ( cParam.getAugmentation(CParameters1.class) == null) {
+ continue;
+ }
+ if(cParam.getAugmentation(CParameters1.class).getMultiprotocolCapability() != null) {
+ final MultiprotocolCapability multi = cParam.getAugmentation(CParameters1.class).getMultiprotocolCapability();
+ final TablesKey tt = new TablesKey(multi.getAfi(), multi.getSafi());
+ LOG.trace("Added table type to sync {}", tt);
+ tts.add(tt);
+ tats.add(new BgpTableTypeImpl(tt.getAfi(), tt.getSafi()));
+ } else if (cParam.getAugmentation(CParameters1.class).getAddPathCapability() != null) {
+ final AddPathCapability addPathCap = cParam.getAugmentation(CParameters1.class).getAddPathCapability();
+ addPathCapabilitiesList.addAll(addPathCap.getAddressFamilies());
+ }
+ }
+ }
+ }
+
+ this.sync = new BGPSynchronization(this.listener, tts);
+ this.tableTypes = tats;
+ this.addPathTypes = addPathCapabilitiesList;
+
+ if (! this.addPathTypes.isEmpty()) {
+ final ChannelPipeline pipeline = this.channel.pipeline();
+ final BGPByteToMessageDecoder decoder = pipeline.get(BGPByteToMessageDecoder.class);
+ decoder.addDecoderConstraint(MultiPathSupport.class,
+ MultiPathSupportImpl.createParserMultiPathSupport(this.addPathTypes));
+ }
+
+ if (this.holdTimerValue != 0) {
+ channel.eventLoop().schedule(new Runnable() {
+ @Override
+ public void run() {
+ handleHoldTimer();
+ }
+ }, this.holdTimerValue, TimeUnit.SECONDS);
+
+ channel.eventLoop().schedule(new Runnable() {
+ @Override
+ public void run() {
+ handleKeepaliveTimer();
+ }
+ }, this.keepAlive, TimeUnit.SECONDS);
+ }
+ this.bgpId = remoteOpen.getBgpIdentifier();
+ this.sessionStats = new BGPSessionStats(remoteOpen, this.holdTimerValue, this.keepAlive, channel, Optional.<BGPSessionPreferences>absent(),
+ this.tableTypes, this.addPathTypes);
+ }
+
+ @Override
+ public synchronized void close() {
+ if (this.state != State.IDLE) {
+ this.writeAndFlush(new NotifyBuilder().setErrorCode(BGPError.CEASE.getCode()).setErrorSubcode(BGPError.CEASE.getSubcode()).build());
+ }
+ this.closeWithoutMessage();
+ }
+
+ /**
+ * Handles incoming message based on their type.
+ *
+ * @param msg incoming message
+ */
+ synchronized void handleMessage(final Notification msg) throws BGPDocumentedException {
+ // Update last reception time
+ this.lastMessageReceivedAt = System.nanoTime();
+ this.sessionStats.updateReceivedMsgTotal();
+
+ if (msg instanceof Open) {
+ // Open messages should not be present here
+ this.terminate(new BGPDocumentedException(null, BGPError.FSM_ERROR));
+ } else if (msg instanceof Notify) {
+ // Notifications are handled internally
+ LOG.info("Session closed because Notification message received: {} / {}", ((Notify) msg).getErrorCode(),
+ ((Notify) msg).getErrorSubcode());
+ this.closeWithoutMessage();
+ this.listener.onSessionTerminated(this, new BGPTerminationReason(
+ BGPError.forValue(((Notify) msg).getErrorCode(), ((Notify) msg).getErrorSubcode())));
+ this.sessionStats.updateReceivedMsgErr((Notify) msg);
+ } else if (msg instanceof Keepalive) {
+ // Keepalives are handled internally
+ LOG.trace("Received KeepAlive messsage.");
+ this.kaCounter++;
+ this.sessionStats.updateReceivedMsgKA();
+ if (this.kaCounter >= 2) {
+ this.sync.kaReceived();
+ }
+ } else if (msg instanceof RouteRefresh) {
+ this.listener.onMessage(this, msg);
+ this.sessionStats.updateReceivedMsgRR();
+ } else if (msg instanceof Update) {
+ this.listener.onMessage(this, msg);
+ this.sync.updReceived((Update) msg);
+ this.sessionStats.updateReceivedMsgUpd();
+ } else {
+ LOG.warn("Ignoring unhandled message: {}.", msg.getClass());
+ }
+ }
+
+ synchronized void endOfInput() {
+ if (this.state == State.UP) {
+ LOG.info(END_OF_INPUT);
+ this.listener.onSessionDown(this, new IOException(END_OF_INPUT));
+ }
+ }
+
+ @GuardedBy("this")
+ private ChannelFuture writeEpilogue(final ChannelFuture future, final Notification msg) {
+ future.addListener(
+ new ChannelFutureListener() {
+ @Override
+ public void operationComplete(final ChannelFuture f) {
+ if (!f.isSuccess()) {
+ LOG.warn("Failed to send message {} to socket {}", msg, BGPSessionImpl.this.channel, f.cause());
+ } else {
+ LOG.trace("Message {} sent to socket {}", msg, BGPSessionImpl.this.channel);
+ }
+ }
+ });
+ this.lastMessageSentAt = System.nanoTime();
+ this.sessionStats.updateSentMsgTotal();
+ if (msg instanceof Update) {
+ this.sessionStats.updateSentMsgUpd();
+ } else if (msg instanceof Notify) {
+ this.sessionStats.updateSentMsgErr((Notify) msg);
+ }
+ return future;
+ }
+
+ void flush() {
+ this.channel.flush();
+ }
+
+ synchronized void write(final Notification msg) {
+ try {
+ writeEpilogue(this.channel.write(msg), msg);
+ } catch (final Exception e) {
+ LOG.warn("Message {} was not sent.", msg, e);
+ }
+ }
+
+ synchronized ChannelFuture writeAndFlush(final Notification msg) {
+ if (isWritable()) {
+ return writeEpilogue(this.channel.writeAndFlush(msg), msg);
+ }
+ return this.channel.newFailedFuture(new NonWritableChannelException());
+ }
+
+ private synchronized void closeWithoutMessage() {
+ LOG.info("Closing session: {}", this);
+ removePeerSession();
+ this.channel.close().addListener(new ChannelFutureListener() {
+ @Override
+ public void operationComplete(final ChannelFuture future) throws Exception {
+ Preconditions.checkArgument(future.isSuccess(), "Channel failed to close: %s", future.cause());
+ }
+ });
+ this.state = State.IDLE;
+ }
+
+ /**
+ * Closes BGP session from the parent with given reason. A message needs to be sent, but parent doesn't have to be
+ * modified, because he initiated the closing. (To prevent concurrent modification exception).
+ *
+ * @param e BGPDocumentedException
+ */
+ private synchronized void terminate(final BGPDocumentedException e) {
+ final BGPError error = e.getError();
+ final byte[] data = e.getData();
+ final NotifyBuilder builder = new NotifyBuilder().setErrorCode(error.getCode()).setErrorSubcode(error.getSubcode());
+ if (data != null && data.length != 0) {
+ builder.setData(data);
+ }
+ this.writeAndFlush(builder.build());
+ this.closeWithoutMessage();
+
+ this.listener.onSessionTerminated(this, new BGPTerminationReason(error));
+ }
+
+ private void removePeerSession() {
+ if (this.peerRegistry != null) {
+ this.peerRegistry.removePeerSession(StrictBGPPeerRegistry.getIpAddress(this.channel.remoteAddress()));
+ }
+ }
+
+ /**
+ * If HoldTimer expires, the session ends. If a message (whichever) was received during this period, the HoldTimer
+ * will be rescheduled by HOLD_TIMER_VALUE + the time that has passed from the start of the HoldTimer to the time at
+ * which the message was received. If the session was closed by the time this method starts to execute (the session
+ * state will become IDLE), then rescheduling won't occur.
+ */
+ private synchronized void handleHoldTimer() {
+ if (this.state == State.IDLE) {
+ return;
+ }
+
+ final long ct = System.nanoTime();
+ final long nextHold = this.lastMessageReceivedAt + TimeUnit.SECONDS.toNanos(this.holdTimerValue);
+
+ if (ct >= nextHold) {
+ LOG.debug("HoldTimer expired. {}", new Date());
+ this.terminate(new BGPDocumentedException(BGPError.HOLD_TIMER_EXPIRED));
+ } else {
+ this.channel.eventLoop().schedule(new Runnable() {
+ @Override
+ public void run() {
+ handleHoldTimer();
+ }
+ }, nextHold - ct, TimeUnit.NANOSECONDS);
+ }
+ }
+
+ /**
+ * If KeepAlive Timer expires, sends KeepAlive message. If a message (whichever) was send during this period, the
+ * KeepAlive Timer will be rescheduled by KEEP_ALIVE_TIMER_VALUE + the time that has passed from the start of the
+ * KeepAlive timer to the time at which the message was sent. If the session was closed by the time this method
+ * starts to execute (the session state will become IDLE), that rescheduling won't occur.
+ */
+ private synchronized void handleKeepaliveTimer() {
+ if (this.state == State.IDLE) {
+ return;
+ }
+
+ final long ct = System.nanoTime();
+ long nextKeepalive = this.lastMessageSentAt + TimeUnit.SECONDS.toNanos(this.keepAlive);
+
+ if (ct >= nextKeepalive) {
+ this.writeAndFlush(KEEP_ALIVE);
+ nextKeepalive = this.lastMessageSentAt + TimeUnit.SECONDS.toNanos(this.keepAlive);
+ this.sessionStats.updateSentMsgKA();
+ }
+ this.channel.eventLoop().schedule(new Runnable() {
+ @Override
+ public void run() {
+ handleKeepaliveTimer();
+ }
+ }, nextKeepalive - ct, TimeUnit.NANOSECONDS);
+ }
+
+ @Override
+ public final String toString() {
+ return addToStringAttributes(MoreObjects.toStringHelper(this)).toString();
+ }
+
+ protected ToStringHelper addToStringAttributes(final ToStringHelper toStringHelper) {
+ toStringHelper.add("channel", this.channel);
+ toStringHelper.add("state", this.getState());
+ return toStringHelper;
+ }
+
+ @Override
+ public Set<BgpTableType> getAdvertisedTableTypes() {
+ return this.tableTypes;
+ }
+
+ @Override
+ public List<AddressFamilies> getAdvertisedAddPathTableTypes() {
+ return this.addPathTypes;
+ }
+
+ protected synchronized void sessionUp() {
+ this.sessionStats.startSessionStopwatch();
+ this.state = State.UP;
+ this.listener.onSessionUp(this);
+ }
+
+ public synchronized State getState() {
+ return this.state;
+ }
+
+ @Override
+ public final Ipv4Address getBgpId() {
+ return this.bgpId;
+ }
+
+ @Override
+ public final AsNumber getAsNumber() {
+ return this.asNumber;
+ }
+
+ synchronized boolean isWritable() {
+ return this.channel != null && this.channel.isWritable();
+ }
+
+ void schedule(final Runnable task) {
+ Preconditions.checkState(this.channel != null);
+ this.channel.eventLoop().submit(task);
+ }
+
+ @VisibleForTesting
+ protected synchronized void setLastMessageSentAt(final long lastMessageSentAt) {
+ this.lastMessageSentAt = lastMessageSentAt;
+ }
+
+ @Override
+ public synchronized BgpSessionState getBgpSessionState() {
+ return this.sessionStats.getBgpSessionState(this.state);
+ }
+
+ @Override
+ public synchronized void resetSessionStats() {
+ this.sessionStats.resetStats();
+ }
+
+ public ChannelOutputLimiter getLimiter() {
+ return this.limiter;
+ }
+
+ @Override
+ public final void channelInactive(final ChannelHandlerContext ctx) {
+ LOG.debug("Channel {} inactive.", ctx.channel());
+ this.endOfInput();
+
+ try {
+ super.channelInactive(ctx);
+ } catch (final Exception e) {
+ throw new IllegalStateException("Failed to delegate channel inactive event on channel " + ctx.channel(), e);
+ }
+ }
+
+ @Override
+ protected final void channelRead0(final ChannelHandlerContext ctx, final Notification msg) {
+ LOG.debug("Message was received: {}", msg);
+ try {
+ this.handleMessage(msg);
+ } catch (final BGPDocumentedException e) {
+ this.terminate(e);
+ }
+ }
+
+ @Override
+ public final void handlerAdded(final ChannelHandlerContext ctx) {
+ this.sessionUp();
+ }
+
+ @Override
+ public void exceptionCaught(final ChannelHandlerContext ctx, final Throwable cause) {
+ LOG.warn("BGP session encountered error", cause);
+ if (cause.getCause() instanceof BGPDocumentedException) {
+ this.terminate((BGPDocumentedException) cause.getCause());
+ } else {
+ this.close();
+ }
+ }
}
Code Review / bgpcep.git / blobdiff