X-Git-Url: https://git.opendaylight.org/gerrit/gitweb?a=blobdiff_plain;f=netconf%2Fnetconf-netty-util%2Fsrc%2Fmain%2Fjava%2Forg%2Fopendaylight%2Fnetconf%2Fnettyutil%2FAbstractNetconfSessionNegotiator.java;h=bbe563b5b19e8ea5b5fed2cf92ac81c74df61e0c;hb=460f7e77b73183799fc1d2898fec1bc50c5829db;hp=d9c15ae03578052a079bc157d44d2e7e9dcb6e1e;hpb=ce8ad4e92f8128750f7ce7216f7e73ad238efaae;p=netconf.git

diff --git a/netconf/netconf-netty-util/src/main/java/org/opendaylight/netconf/nettyutil/AbstractNetconfSessionNegotiator.java b/netconf/netconf-netty-util/src/main/java/org/opendaylight/netconf/nettyutil/AbstractNetconfSessionNegotiator.java
index d9c15ae035..bbe563b5b1 100644
--- a/netconf/netconf-netty-util/src/main/java/org/opendaylight/netconf/nettyutil/AbstractNetconfSessionNegotiator.java
+++ b/netconf/netconf-netty-util/src/main/java/org/opendaylight/netconf/nettyutil/AbstractNetconfSessionNegotiator.java
@@ -5,23 +5,22 @@
  * terms of the Eclipse Public License v1.0 which accompanies this distribution,
  * and is available at http://www.eclipse.org/legal/epl-v10.html
  */
-
 package org.opendaylight.netconf.nettyutil;
 
-import com.google.common.base.Optional;
-import com.google.common.base.Preconditions;
+import static com.google.common.base.Preconditions.checkState;
+import static java.util.Objects.requireNonNull;
+
 import io.netty.channel.Channel;
-import io.netty.channel.ChannelFuture;
 import io.netty.channel.ChannelHandler;
 import io.netty.channel.ChannelHandlerContext;
 import io.netty.channel.ChannelInboundHandlerAdapter;
 import io.netty.handler.ssl.SslHandler;
 import io.netty.util.Timeout;
 import io.netty.util.Timer;
-import io.netty.util.TimerTask;
-import io.netty.util.concurrent.GenericFutureListener;
 import io.netty.util.concurrent.Promise;
+import java.util.Optional;
 import java.util.concurrent.TimeUnit;
+import org.checkerframework.checker.lock.qual.GuardedBy;
 import org.opendaylight.netconf.api.NetconfDocumentedException;
 import org.opendaylight.netconf.api.NetconfMessage;
 import org.opendaylight.netconf.api.NetconfSessionListener;
@@ -34,7 +33,6 @@ import org.opendaylight.netconf.nettyutil.handler.NetconfMessageToXMLEncoder;
 import org.opendaylight.netconf.nettyutil.handler.NetconfXMLToHelloMessageDecoder;
 import org.opendaylight.netconf.nettyutil.handler.NetconfXMLToMessageDecoder;
 import org.opendaylight.netconf.util.messages.FramingMechanism;
-import org.opendaylight.protocol.framework.AbstractSessionNegotiator;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import org.w3c.dom.Document;
@@ -42,17 +40,7 @@ import org.w3c.dom.NodeList;
 
 public abstract class AbstractNetconfSessionNegotiator<P extends NetconfSessionPreferences,
         S extends AbstractNetconfSession<S, L>, L extends NetconfSessionListener<S>>
-    extends AbstractSessionNegotiator<NetconfHelloMessage, S> {
-
-    private static final Logger LOG = LoggerFactory.getLogger(AbstractNetconfSessionNegotiator.class);
-
-    public static final String NAME_OF_EXCEPTION_HANDLER = "lastExceptionHandler";
-
-    protected final P sessionPreferences;
-
-    private final L sessionListener;
-    private Timeout timeout;
-
+            extends ChannelInboundHandlerAdapter implements NetconfSessionNegotiator<S> {
     /**
      * Possible states for Finite State Machine.
      */
@@ -60,23 +48,33 @@ public abstract class AbstractNetconfSessionNegotiator<P extends NetconfSessionP
         IDLE, OPEN_WAIT, FAILED, ESTABLISHED
     }
 
-    private State state = State.IDLE;
+    private static final Logger LOG = LoggerFactory.getLogger(AbstractNetconfSessionNegotiator.class);
+    private static final String NAME_OF_EXCEPTION_HANDLER = "lastExceptionHandler";
+
+    protected final P sessionPreferences;
+    protected final Channel channel;
+
+    private final long connectionTimeoutMillis;
     private final Promise<S> promise;
+    private final L sessionListener;
     private final Timer timer;
-    private final long connectionTimeoutMillis;
+
+    private Timeout timeoutTask;
+
+    @GuardedBy("this")
+    private State state = State.IDLE;
 
     protected AbstractNetconfSessionNegotiator(final P sessionPreferences, final Promise<S> promise,
                                                final Channel channel, final Timer timer,
                                                final L sessionListener, final long connectionTimeoutMillis) {
-        super(promise, channel);
+        this.channel = requireNonNull(channel);
+        this.promise = requireNonNull(promise);
         this.sessionPreferences = sessionPreferences;
-        this.promise = promise;
         this.timer = timer;
         this.sessionListener = sessionListener;
         this.connectionTimeoutMillis = connectionTimeoutMillis;
     }
 
-    @Override
     protected final void startNegotiation() {
         if (ifNegotiatedAlready()) {
             LOG.debug("Negotiation on channel {} already started", channel);
@@ -84,7 +82,7 @@ public abstract class AbstractNetconfSessionNegotiator<P extends NetconfSessionP
             final Optional<SslHandler> sslHandler = getSslHandler(channel);
             if (sslHandler.isPresent()) {
                 sslHandler.get().handshakeFuture().addListener(future -> {
-                    Preconditions.checkState(future.isSuccess(), "Ssl handshake was not successful");
+                    checkState(future.isSuccess(), "Ssl handshake was not successful");
                     LOG.debug("Ssl handshake complete");
                     start();
                 });
@@ -100,11 +98,10 @@ public abstract class AbstractNetconfSessionNegotiator<P extends NetconfSessionP
     }
 
     private static Optional<SslHandler> getSslHandler(final Channel channel) {
-        final SslHandler sslHandler = channel.pipeline().get(SslHandler.class);
-        return sslHandler == null ? Optional.absent() : Optional.of(sslHandler);
+        return Optional.ofNullable(channel.pipeline().get(SslHandler.class));
     }
 
-    public P getSessionPreferences() {
+    public final P getSessionPreferences() {
         return sessionPreferences;
     }
 
@@ -119,52 +116,42 @@ public abstract class AbstractNetconfSessionNegotiator<P extends NetconfSessionP
         replaceHelloMessageOutboundHandler();
         changeState(State.OPEN_WAIT);
 
-        timeout = this.timer.newTimeout(new TimerTask() {
-            @Override
-            @SuppressWarnings("checkstyle:hiddenField")
-            public void run(final Timeout timeout) {
-                synchronized (this) {
-                    if (state != State.ESTABLISHED) {
-
-                        LOG.debug("Connection timeout after {}, session is in state {}", timeout, state);
-
-                        // Do not fail negotiation if promise is done or canceled
-                        // It would result in setting result of the promise second time and that throws exception
-                        if (!isPromiseFinished()) {
-                            LOG.warn("Netconf session was not established after {}", connectionTimeoutMillis);
-                            changeState(State.FAILED);
-
-                            channel.close().addListener((GenericFutureListener<ChannelFuture>) future -> {
-                                if (future.isSuccess()) {
-                                    LOG.debug("Channel {} closed: success", future.channel());
-                                } else {
-                                    LOG.warn("Channel {} closed: fail", future.channel());
-                                }
-                            });
-                        }
-                    } else if (channel.isOpen()) {
-                        channel.pipeline().remove(NAME_OF_EXCEPTION_HANDLER);
-                    }
-                }
-            }
+        timeoutTask = this.timer.newTimeout(this::timeoutExpired, connectionTimeoutMillis, TimeUnit.MILLISECONDS);
+    }
 
-            private boolean isPromiseFinished() {
-                return promise.isDone() || promise.isCancelled();
+    private synchronized void timeoutExpired(final Timeout timeout) {
+        if (state != State.ESTABLISHED) {
+            LOG.debug("Connection timeout after {}, session backed by channel {} is in state {}", timeout, channel,
+                state);
+
+            // Do not fail negotiation if promise is done or canceled
+            // It would result in setting result of the promise second time and that throws exception
+            if (!promise.isDone() && !promise.isCancelled()) {
+                LOG.warn("Netconf session backed by channel {} was not established after {}", channel,
+                    connectionTimeoutMillis);
+                changeState(State.FAILED);
+
+                channel.close().addListener(future -> {
+                    if (future.isSuccess()) {
+                        LOG.debug("Channel {} closed: success", channel);
+                    } else {
+                        LOG.warn("Channel {} closed: fail", channel);
+                    }
+                });
             }
-
-        }, connectionTimeoutMillis, TimeUnit.MILLISECONDS);
+        } else if (channel.isOpen()) {
+            channel.pipeline().remove(NAME_OF_EXCEPTION_HANDLER);
+        }
     }
 
     private void cancelTimeout() {
-        if (timeout != null) {
-            timeout.cancel();
+        if (timeoutTask != null) {
+            timeoutTask.cancel();
         }
     }
 
     protected final S getSessionForHelloMessage(final NetconfHelloMessage netconfMessage)
             throws NetconfDocumentedException {
-        Preconditions.checkNotNull(netconfMessage, "netconfMessage");
-
         final Document doc = netconfMessage.getDocument();
 
         if (shouldUseChunkFraming(doc)) {
@@ -175,6 +162,9 @@ public abstract class AbstractNetconfSessionNegotiator<P extends NetconfSessionP
         return getSession(sessionListener, channel, netconfMessage);
     }
 
+    protected abstract S getSession(L sessionListener, Channel channel, NetconfHelloMessage message)
+        throws NetconfDocumentedException;
+
     /**
      * Insert chunk framing handlers into the pipeline.
      */
@@ -201,7 +191,7 @@ public abstract class AbstractNetconfSessionNegotiator<P extends NetconfSessionP
         ChannelHandler helloMessageHandler = replaceChannelHandler(channel,
                 AbstractChannelInitializer.NETCONF_MESSAGE_DECODER, new NetconfXMLToMessageDecoder());
 
-        Preconditions.checkState(helloMessageHandler instanceof NetconfXMLToHelloMessageDecoder,
+        checkState(helloMessageHandler instanceof NetconfXMLToHelloMessageDecoder,
                 "Pipeline handlers misplaced on session: %s, pipeline: %s", session, channel.pipeline());
         Iterable<NetconfMessage> netconfMessagesFromNegotiation =
                 ((NetconfXMLToHelloMessageDecoder) helloMessageHandler).getPostHelloNetconfMessages();
@@ -228,14 +218,10 @@ public abstract class AbstractNetconfSessionNegotiator<P extends NetconfSessionP
         return channel.pipeline().replace(handlerKey, handlerKey, decoder);
     }
 
-    @SuppressWarnings("checkstyle:hiddenField")
-    protected abstract S getSession(L sessionListener, Channel channel, NetconfHelloMessage message)
-            throws NetconfDocumentedException;
-
     private synchronized void changeState(final State newState) {
         LOG.debug("Changing state from : {} to : {} for channel: {}", state, newState, channel);
-        Preconditions.checkState(isStateChangePermitted(state, newState),
-                "Cannot change state from %s to %s for chanel %s", state, newState, channel);
+        checkState(isStateChangePermitted(state, newState),
+                "Cannot change state from %s to %s for channel %s", state, newState, channel);
         this.state = newState;
     }
 
@@ -271,10 +257,73 @@ public abstract class AbstractNetconfSessionNegotiator<P extends NetconfSessionP
     private final class ExceptionHandlingInboundChannelHandler extends ChannelInboundHandlerAdapter {
         @Override
         public void exceptionCaught(final ChannelHandlerContext ctx, final Throwable cause) {
-            LOG.warn("An exception occurred during negotiation with {}", channel.remoteAddress(), cause);
+            LOG.warn("An exception occurred during negotiation with {} on channel {}",
+                    channel.remoteAddress(), channel, cause);
+            // FIXME: this is quite suspect as it is competing with timeoutExpired() without synchronization
             cancelTimeout();
             negotiationFailed(cause);
             changeState(State.FAILED);
         }
     }
+
+    protected final void negotiationSuccessful(final S session) {
+        LOG.debug("Negotiation on channel {} successful with session {}", channel, session);
+        channel.pipeline().replace(this, "session", session);
+        promise.setSuccess(session);
+    }
+
+    protected void negotiationFailed(final Throwable cause) {
+        LOG.debug("Negotiation on channel {} failed", channel, cause);
+        channel.close();
+        promise.setFailure(cause);
+    }
+
+    /**
+     * Send a message to peer and fail negotiation if it does not reach
+     * the peer.
+     *
+     * @param msg Message which should be sent.
+     */
+    protected final void sendMessage(final NetconfMessage msg) {
+        this.channel.writeAndFlush(msg).addListener(f -> {
+            if (!f.isSuccess()) {
+                LOG.info("Failed to send message {} on channel {}", msg, channel, f.cause());
+                negotiationFailed(f.cause());
+            } else {
+                LOG.trace("Message {} sent to socket on channel {}", msg, channel);
+            }
+        });
+    }
+
+    @Override
+    @SuppressWarnings("checkstyle:illegalCatch")
+    public final void channelActive(final ChannelHandlerContext ctx) {
+        LOG.debug("Starting session negotiation on channel {}", channel);
+        try {
+            startNegotiation();
+        } catch (final Exception e) {
+            LOG.warn("Unexpected negotiation failure on channel {}", channel, e);
+            negotiationFailed(e);
+        }
+    }
+
+    @Override
+    @SuppressWarnings("checkstyle:illegalCatch")
+    public final void channelRead(final ChannelHandlerContext ctx, final Object msg) {
+        LOG.debug("Negotiation read invoked on channel {}", channel);
+        try {
+            handleMessage((NetconfHelloMessage) msg);
+        } catch (final Exception e) {
+            LOG.debug("Unexpected error while handling negotiation message {} on channel {}", msg, channel, e);
+            negotiationFailed(e);
+        }
+    }
+
+    @Override
+    public void exceptionCaught(final ChannelHandlerContext ctx, final Throwable cause) {
+        LOG.info("Unexpected error during negotiation on channel {}", channel, cause);
+        negotiationFailed(cause);
+    }
+
+    protected abstract void handleMessage(NetconfHelloMessage msg) throws Exception;
 }