Ejemplo n.º 1
0
 /** Quick and dirty way to close a connection to a tablet server, if it wasn't already closed. */
 @VisibleForTesting
 void disconnect() {
   Channel chancopy = chan;
   if (chancopy != null && chancopy.isConnected()) {
     Channels.disconnect(chancopy);
   }
 }
  protected void sendRequest(
      HttpRequest request,
      SendRequestResultListener listener,
      HttpResponseProcessor responseProcessor) {
    if (isClosingOrClosed()) {
      listener.onSendRequestFailure(request, new ClosedChannelException());
    } else if (!isConnected()) {
      listener.onSendRequestFailure(request, new RuntimeException("unable to send request"));
    } else {
      try {
        setResponseProcessor(responseProcessor, listener);
      } catch (DatabusException e) {
        listener.onSendRequestFailure(request, e.getCause());
        _channel.close();
        return;
      }

      // Send the HTTP request.
      if (_channel.isConnected()) {
        // ChannelFuture future = _channel.write(request);
        // future.addListener(new MySendRequestListener(request, listener));
        _channel.write(request);
      } else {
        _log.error("disconnect on request: " + request.getUri());
        listener.onSendRequestFailure(request, new ClosedChannelException());
      }
    }
  }
Ejemplo n.º 3
0
  /**
   * Forcefully shuts down the connection to this tablet server and fails all the outstanding RPCs.
   * Only use when shutting down a client.
   *
   * @return deferred object to use to track the shutting down of this connection
   */
  public Deferred<Void> shutdown() {
    // First, check whether we have RPCs in flight and cancel them.
    for (Iterator<KuduRpc<?>> ite = rpcs_inflight.values().iterator(); ite.hasNext(); ) {
      KuduRpc<?> rpc = ite.next();
      rpc.errback(new ConnectionResetException(null));
      ite.remove();
    }

    // Same for the pending RPCs.
    synchronized (this) {
      if (pending_rpcs != null) {
        for (Iterator<KuduRpc<?>> ite = pending_rpcs.iterator(); ite.hasNext(); ) {
          ite.next().errback(new ConnectionResetException(null));
          ite.remove();
        }
      }
    }

    final Channel chancopy = chan;
    if (chancopy == null) {
      return Deferred.fromResult(null);
    }
    if (chancopy.isConnected()) {
      Channels.disconnect(chancopy); // ... this is going to set it to null.
      // At this point, all in-flight RPCs are going to be failed.
    }
    if (chancopy.isBound()) {
      Channels.unbind(chancopy);
    }
    // It's OK to call close() on a Channel if it's already closed.
    final ChannelFuture future = Channels.close(chancopy);
    // Now wrap the ChannelFuture in a Deferred.
    final Deferred<Void> d = new Deferred<Void>();
    // Opportunistically check if it's already completed successfully.
    if (future.isSuccess()) {
      d.callback(null);
    } else {
      // If we get here, either the future failed (yeah, that sounds weird)
      // or the future hasn't completed yet (heh).
      future.addListener(
          new ChannelFutureListener() {
            public void operationComplete(final ChannelFuture future) {
              if (future.isSuccess()) {
                d.callback(null);
                return;
              }
              final Throwable t = future.getCause();
              if (t instanceof Exception) {
                d.callback(t);
              } else {
                // Wrap the Throwable because Deferred doesn't handle Throwables,
                // it only uses Exception.
                d.callback(
                    new NonRecoverableException("Failed to shutdown: " + TabletClient.this, t));
              }
            }
          });
    }
    return d;
  }
 @Override
 public void exceptionCaught(ChannelHandlerContext ctx, ExceptionEvent e) throws Exception {
   Channel ch = e.getChannel();
   Throwable cause = e.getCause();
   if (cause instanceof TooLongFrameException) {
     sendError(ctx, HttpResponseStatus.BAD_REQUEST);
     return;
   }
   if (cause != null) {
     if (cause.getClass().equals(IOException.class)) {
       LOGGER.debug("Connection error: " + cause);
       StartStopListenerDelegate startStopListenerDelegate =
           (StartStopListenerDelegate) ctx.getAttachment();
       if (startStopListenerDelegate != null) {
         LOGGER.debug("Premature end, stopping...");
         startStopListenerDelegate.stop();
       }
     } else if (!cause.getClass().equals(ClosedChannelException.class)) {
       LOGGER.debug("Caught exception: " + cause);
     }
   }
   if (ch.isConnected()) {
     sendError(ctx, HttpResponseStatus.INTERNAL_SERVER_ERROR);
   }
   e.getChannel().close();
 }
  @Override
  public void exceptionCaught(ChannelHandlerContext ctx, ExceptionEvent e) throws Exception {
    getLogger(ctx.getChannel()).debug("Error while processing imap request", e.getCause());

    if (e.getCause() instanceof TooLongFrameException) {

      // Max line length exceeded
      // See RFC 2683 section 3.2.1
      //
      // "For its part, a server should allow for a command line of at
      // least
      // 8000 octets. This provides plenty of leeway for accepting
      // reasonable
      // length commands from clients. The server should send a BAD
      // response
      // to a command that does not end within the server's maximum
      // accepted
      // command length."
      //
      // See also JAMES-1190
      ImapResponseComposer composer = (ImapResponseComposer) ctx.getAttachment();
      composer.untaggedResponse(
          ImapConstants.BAD + " failed. Maximum command line length exceeded");
    } else {
      // logout on error not sure if that is the best way to handle it
      final ImapSession imapSession = (ImapSession) attributes.get(ctx.getChannel());
      if (imapSession != null) imapSession.logout();

      // Make sure we close the channel after all the buffers were flushed out
      Channel channel = ctx.getChannel();
      if (channel.isConnected()) {
        channel.write(ChannelBuffers.EMPTY_BUFFER).addListener(ChannelFutureListener.CLOSE);
      }
    }
  }
Ejemplo n.º 6
0
 public void ping() {
   if (!channel.isConnected()) {
     System.err.println("MQtt Channel disconnected");
     timer.cancel();
     reconnect();
   }
   channel.write(new PingReqMessage());
 }
  @Override
  public void exceptionCaught(ChannelHandlerContext ctx, ExceptionEvent e) throws Exception {
    Channel ch = e.getChannel();
    Throwable cause = e.getCause();
    if (cause instanceof TooLongFrameException) {
      sendError(ctx, BAD_REQUEST);
      return;
    }

    cause.printStackTrace();
    if (ch.isConnected()) {
      sendError(ctx, INTERNAL_SERVER_ERROR);
    }
  }
Ejemplo n.º 8
0
 /**
  * Send a file (with zero-copy) to the client. This method doesn't provide any security guarantee.
  * The caller is responsible for the argument they pass in.
  *
  * @param status The status of the request (e.g. 200 OK or 404 Not Found).
  * @param path The path to the file to send to the client.
  * @param max_age The expiration time of this entity, in seconds. This is not a timestamp, it's
  *     how old the resource is allowed to be in the client cache. See RFC 2616 section 14.9 for
  *     more information. Use 0 to disable caching.
  */
 public void sendFile(final HttpResponseStatus status, final String path, final int max_age)
     throws IOException {
   if (max_age < 0) {
     throw new IllegalArgumentException("Negative max_age=" + max_age + " for path=" + path);
   }
   if (!chan.isConnected()) {
     done();
     return;
   }
   RandomAccessFile file;
   try {
     file = new RandomAccessFile(path, "r");
   } catch (FileNotFoundException e) {
     logWarn("File not found: " + e.getMessage());
     if (querystring != null) {
       querystring.remove("png"); // Avoid potential recursion.
     }
     notFound();
     return;
   }
   final long length = file.length();
   {
     final DefaultHttpResponse response = new DefaultHttpResponse(HttpVersion.HTTP_1_1, status);
     final String mimetype = guessMimeTypeFromUri(path);
     response.setHeader(
         HttpHeaders.Names.CONTENT_TYPE, mimetype == null ? "text/plain" : mimetype);
     final long mtime = new File(path).lastModified();
     if (mtime > 0) {
       response.setHeader(HttpHeaders.Names.AGE, (System.currentTimeMillis() - mtime) / 1000);
     } else {
       logWarn("Found a file with mtime=" + mtime + ": " + path);
     }
     response.setHeader(
         HttpHeaders.Names.CACHE_CONTROL, max_age == 0 ? "no-cache" : "max-age=" + max_age);
     HttpHeaders.setContentLength(response, length);
     chan.write(response);
   }
   final DefaultFileRegion region = new DefaultFileRegion(file.getChannel(), 0, length);
   final ChannelFuture future = chan.write(region);
   future.addListener(
       new ChannelFutureListener() {
         public void operationComplete(final ChannelFuture future) {
           region.releaseExternalResources();
           done();
         }
       });
   if (!HttpHeaders.isKeepAlive(request)) {
     future.addListener(ChannelFutureListener.CLOSE);
   }
 }
  /** {@inheritDoc} */
  public Channel poll(String uri) {
    if (!provider.getConfig().isSslConnectionPoolEnabled() && uri.startsWith("https")) {
      return null;
    }

    Channel channel = null;
    ConcurrentLinkedQueue<Channel> pooledConnectionForHost = connectionsPool.get(uri);
    if (pooledConnectionForHost != null) {
      boolean poolEmpty = false;
      while (!poolEmpty && channel == null) {
        if (pooledConnectionForHost.size() > 0) {
          channel = pooledConnectionForHost.poll();
        }

        if (channel == null) {
          poolEmpty = true;
        } else if (!channel.isConnected() || !channel.isOpen()) {
          removeAll(channel);
          channel = null;
        } else {
          Timeout idleFuture = trackedIdleConnections.remove(channel);
          if (idleFuture != null) {
            idleFuture.cancel();
          }

          // Double checking the channel hasn't been closed in between.
          if (!channel.isConnected() || !channel.isOpen()) {
            channel = null;
          }

          log.debug(
              "ConnectionsPool decrementAndGet totalConnections {}", trackedIdleConnections.size());
        }
      }
    }
    return channel;
  }
  /** Closes the connection. Note: this method will block until the connection is actually closed */
  @Override
  public void close() {
    _log.info("closing connection to: " + _server.getAddress());
    final State newState = switchToClosing();
    if (State.CLOSING != newState && State.CLOSED != newState) {
      return;
    }

    if (null == _channel || !_channel.isConnected()) {
      switchToClosed();
    } else {
      _channel.close();
      awaitForCloseUninterruptibly();
    }
  }
Ejemplo n.º 11
0
  @Override
  public void exceptionCaught(ChannelHandlerContext ctx, ExceptionEvent e) throws Exception {
    Channel ch = e.getChannel();
    Throwable cause = e.getCause();
    if (cause instanceof TooLongFrameException) {
      sendError(ctx, BAD_REQUEST);
      return;
    }

    LOG.error("Shuffle error: ", cause);
    shuffleMetrics.failedOutput();
    if (ch.isConnected()) {
      LOG.error("Shuffle error " + e);
      sendError(ctx, INTERNAL_SERVER_ERROR);
    }
  }
 @Override
 public void exceptionCaught(ChannelHandlerContext ctx, ExceptionEvent e) throws Exception {
   Channel ch = e.getChannel();
   Throwable cause = e.getCause();
   if (cause instanceof TooLongFrameException) {
     sendError(ctx, HttpResponseStatus.BAD_REQUEST);
     return;
   }
   if (cause != null
       && !cause.getClass().equals(ClosedChannelException.class)
       && !cause.getClass().equals(IOException.class)) {
     LOGGER.debug("Caught exception", cause);
   }
   if (ch.isConnected()) {
     sendError(ctx, HttpResponseStatus.INTERNAL_SERVER_ERROR);
   }
   e.getChannel().close();
 }
Ejemplo n.º 13
0
 /**
  * Sends an HTTP reply to the client.
  *
  * @param status The status of the request (e.g. 200 OK or 404 Not Found).
  * @param buf The content of the reply to send.
  */
 private void sendBuffer(final HttpResponseStatus status, final ChannelBuffer buf) {
   if (!chan.isConnected()) {
     done();
     return;
   }
   final DefaultHttpResponse response = new DefaultHttpResponse(HttpVersion.HTTP_1_1, status);
   response.setHeader(HttpHeaders.Names.CONTENT_TYPE, guessMimeType(buf));
   // TODO(tsuna): Server, X-Backend, etc. headers.
   response.setContent(buf);
   final boolean keepalive = HttpHeaders.isKeepAlive(request);
   if (keepalive) {
     HttpHeaders.setContentLength(response, buf.readableBytes());
   }
   final ChannelFuture future = chan.write(response);
   if (!keepalive) {
     future.addListener(ChannelFutureListener.CLOSE);
   }
   done();
 }
  @Override
  public void messageReceived(ChannelHandlerContext ctx, MessageEvent e) throws Exception {
    ImapSession session = (ImapSession) attributes.get(ctx.getChannel());
    ImapResponseComposer response = (ImapResponseComposer) ctx.getAttachment();
    ImapMessage message = (ImapMessage) e.getMessage();
    ChannelPipeline cp = ctx.getPipeline();

    try {
      if (cp.get(NettyConstants.EXECUTION_HANDLER) != null) {
        cp.addBefore(
            NettyConstants.EXECUTION_HANDLER, NettyConstants.HEARTBEAT_HANDLER, heartbeatHandler);
      } else {
        cp.addBefore(
            NettyConstants.CORE_HANDLER, NettyConstants.HEARTBEAT_HANDLER, heartbeatHandler);
      }
      final ResponseEncoder responseEncoder = new ResponseEncoder(encoder, response, session);
      processor.process(message, responseEncoder, session);

      if (session.getState() == ImapSessionState.LOGOUT) {
        // Make sure we close the channel after all the buffers were flushed out
        Channel channel = ctx.getChannel();
        if (channel.isConnected()) {
          channel.write(ChannelBuffers.EMPTY_BUFFER).addListener(ChannelFutureListener.CLOSE);
        }
      }
      final IOException failure = responseEncoder.getFailure();

      if (failure != null) {
        final Logger logger = session.getLog();
        logger.info(failure.getMessage());
        if (logger.isDebugEnabled()) {
          logger.debug("Failed to write " + message, failure);
        }
        throw failure;
      }
    } finally {
      ctx.getPipeline().remove(NettyConstants.HEARTBEAT_HANDLER);
    }

    super.messageReceived(ctx, e);
  }
Ejemplo n.º 15
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 public boolean isConnected() {
   return channel.isConnected();
 }
Ejemplo n.º 16
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 public boolean isConnected() {
   return channel != null
       && channel.isConnected()
       && channel.isOpen()
       && mailClientHandler.isLoggedIn();
 }
Ejemplo n.º 17
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 @Override
 public final void sendMsg(List<OFMessage> msgs) {
   if (role == RoleState.MASTER && channel.isConnected()) {
     channel.write(msgs);
   }
 }
Ejemplo n.º 18
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 @Override
 public final void sendMsg(OFMessage m) {
   if (role == RoleState.MASTER && channel.isConnected()) {
     channel.write(Collections.singletonList(m));
   }
 }
 @Override
 public boolean isOpen() {
   return channel.isConnected();
 }
Ejemplo n.º 20
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 @Override
 protected void dispose(Triplet<Channel, ChannelBuffer, ByteBuffer> resource) {
   Channel channel = resource.first();
   if (channel.isConnected()) channel.close();
 }
 @Override
 public boolean isClosed() {
   return !channel.isConnected();
 }
Ejemplo n.º 22
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 /** Closes the specified channel after all queued write requests are flushed. */
 static void closeOnFlush(Channel ch) {
   if (ch.isConnected()) {
     ch.write(ChannelBuffers.EMPTY_BUFFER).addListener(ChannelFutureListener.CLOSE);
   }
 }
Ejemplo n.º 23
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 @Override
 public boolean isAvaliable() {
   return channel != null && channel.isConnected();
 }