Examples with ExceptionEvent org.jboss.netty.channel.ExceptionEvent used on opensource projects

Example 1 with ExceptionEvent

use of org.jboss.netty.channel.ExceptionEvent in project graylog2-server by Graylog2.

the class NettyTransport method getBaseChannelHandlers.

/**
     * Subclasses can override this to add additional ChannelHandlers to the pipeline to support additional features.
     * <p/>
     * Some common use cases are to add SSL/TLS, connection counters or throttling traffic shapers.
     *
     * @param input
     * @return the list of initial channelhandlers to add to the {@link org.jboss.netty.channel.ChannelPipelineFactory}
     */
protected LinkedHashMap<String, Callable<? extends ChannelHandler>> getBaseChannelHandlers(final MessageInput input) {
    LinkedHashMap<String, Callable<? extends ChannelHandler>> handlerList = Maps.newLinkedHashMap();
    handlerList.put("exception-logger", new Callable<ChannelHandler>() {

        @Override
        public ChannelHandler call() throws Exception {
            return new SimpleChannelUpstreamHandler() {

                @SuppressWarnings("ThrowableResultOfMethodCallIgnored")
                @Override
                public void exceptionCaught(ChannelHandlerContext ctx, ExceptionEvent e) throws Exception {
                    if ("Connection reset by peer".equals(e.getCause().getMessage())) {
                        log.trace("{} in Input [{}/{}] (channel {})", e.getCause().getMessage(), input.getName(), input.getId(), e.getChannel());
                    } else {
                        log.error("Error in Input [{}/{}] (channel {})", input.getName(), input.getId(), e.getChannel(), e.getCause());
                    }
                    super.exceptionCaught(ctx, e);
                }
            };
        }
    });
    handlerList.put("packet-meta-dumper", new Callable<ChannelHandler>() {

        @Override
        public ChannelHandler call() throws Exception {
            return new PacketInformationDumper(input);
        }
    });
    handlerList.put("traffic-counter", Callables.returning(throughputCounter));
    return handlerList;
}

Example 2 with ExceptionEvent

use of org.jboss.netty.channel.ExceptionEvent in project druid by druid-io.

the class NettyHttpClient method go.

@Override
public <Intermediate, Final> ListenableFuture<Final> go(final Request request, final HttpResponseHandler<Intermediate, Final> handler, final Duration requestReadTimeout) {
    final HttpMethod method = request.getMethod();
    final URL url = request.getUrl();
    final Multimap<String, String> headers = request.getHeaders();
    final String requestDesc = method + " " + url;
    if (log.isDebugEnabled()) {
        log.debug("[%s] starting", requestDesc);
    }
    // Block while acquiring a channel from the pool, then complete the request asynchronously.
    final Channel channel;
    final String hostKey = getPoolKey(url);
    final ResourceContainer<ChannelFuture> channelResourceContainer = pool.take(hostKey);
    final ChannelFuture channelFuture = channelResourceContainer.get().awaitUninterruptibly();
    if (!channelFuture.isSuccess()) {
        // Some other poor sap will have to deal with it...
        channelResourceContainer.returnResource();
        return Futures.immediateFailedFuture(new ChannelException("Faulty channel in resource pool", channelFuture.getCause()));
    } else {
        channel = channelFuture.getChannel();
        // In case we get a channel that never had its readability turned back on.
        channel.setReadable(true);
    }
    final String urlFile = StringUtils.nullToEmptyNonDruidDataString(url.getFile());
    final HttpRequest httpRequest = new DefaultHttpRequest(HttpVersion.HTTP_1_1, method, urlFile.isEmpty() ? "/" : urlFile);
    if (!headers.containsKey(HttpHeaders.Names.HOST)) {
        httpRequest.headers().add(HttpHeaders.Names.HOST, getHost(url));
    }
    // If Accept-Encoding is set in the Request, use that. Otherwise use the default from "compressionCodec".
    if (!headers.containsKey(HttpHeaders.Names.ACCEPT_ENCODING)) {
        httpRequest.headers().set(HttpHeaders.Names.ACCEPT_ENCODING, compressionCodec.getEncodingString());
    }
    for (Map.Entry<String, Collection<String>> entry : headers.asMap().entrySet()) {
        String key = entry.getKey();
        for (String obj : entry.getValue()) {
            httpRequest.headers().add(key, obj);
        }
    }
    if (request.hasContent()) {
        httpRequest.setContent(request.getContent());
    }
    final long readTimeout = getReadTimeout(requestReadTimeout);
    final SettableFuture<Final> retVal = SettableFuture.create();
    if (readTimeout > 0) {
        channel.getPipeline().addLast(READ_TIMEOUT_HANDLER_NAME, new ReadTimeoutHandler(timer, readTimeout, TimeUnit.MILLISECONDS));
    }
    channel.getPipeline().addLast(LAST_HANDLER_NAME, new SimpleChannelUpstreamHandler() {

        private volatile ClientResponse<Intermediate> response = null;

        // Chunk number most recently assigned.
        private long currentChunkNum = 0;

        // Suspend and resume watermarks (respectively: last chunk number that triggered a suspend, and that was
        // provided to the TrafficCop's resume method). Synchronized access since they are not always accessed
        // from an I/O thread. (TrafficCops can be called from any thread.)
        private final Object watermarkLock = new Object();

        private long suspendWatermark = -1;

        private long resumeWatermark = -1;

        @Override
        public void messageReceived(ChannelHandlerContext ctx, MessageEvent e) {
            if (log.isDebugEnabled()) {
                log.debug("[%s] messageReceived: %s", requestDesc, e.getMessage());
            }
            try {
                Object msg = e.getMessage();
                if (msg instanceof HttpResponse) {
                    HttpResponse httpResponse = (HttpResponse) msg;
                    if (log.isDebugEnabled()) {
                        log.debug("[%s] Got response: %s", requestDesc, httpResponse.getStatus());
                    }
                    HttpResponseHandler.TrafficCop trafficCop = resumeChunkNum -> {
                        synchronized (watermarkLock) {
                            resumeWatermark = Math.max(resumeWatermark, resumeChunkNum);
                            if (suspendWatermark >= 0 && resumeWatermark >= suspendWatermark) {
                                suspendWatermark = -1;
                                channel.setReadable(true);
                                long backPressureDuration = System.nanoTime() - backPressureStartTimeNs;
                                log.debug("[%s] Resumed reads from channel (chunkNum = %,d).", requestDesc, resumeChunkNum);
                                return backPressureDuration;
                            }
                        }
                        // If we didn't resume, don't know if backpressure was happening
                        return 0;
                    };
                    response = handler.handleResponse(httpResponse, trafficCop);
                    if (response.isFinished()) {
                        retVal.set((Final) response.getObj());
                    }
                    assert currentChunkNum == 0;
                    possiblySuspendReads(response);
                    if (!httpResponse.isChunked()) {
                        finishRequest();
                    }
                } else if (msg instanceof HttpChunk) {
                    HttpChunk httpChunk = (HttpChunk) msg;
                    if (log.isDebugEnabled()) {
                        log.debug("[%s] Got chunk: %sB, last=%s", requestDesc, httpChunk.getContent().readableBytes(), httpChunk.isLast());
                    }
                    if (httpChunk.isLast()) {
                        finishRequest();
                    } else {
                        response = handler.handleChunk(response, httpChunk, ++currentChunkNum);
                        if (response.isFinished() && !retVal.isDone()) {
                            retVal.set((Final) response.getObj());
                        }
                        possiblySuspendReads(response);
                    }
                } else {
                    throw new ISE("Unknown message type[%s]", msg.getClass());
                }
            } catch (Exception ex) {
                log.warn(ex, "[%s] Exception thrown while processing message, closing channel.", requestDesc);
                if (!retVal.isDone()) {
                    retVal.set(null);
                }
                channel.close();
                channelResourceContainer.returnResource();
                throw ex;
            }
        }

        private void possiblySuspendReads(ClientResponse<?> response) {
            if (!response.isContinueReading()) {
                synchronized (watermarkLock) {
                    suspendWatermark = Math.max(suspendWatermark, currentChunkNum);
                    if (suspendWatermark > resumeWatermark) {
                        channel.setReadable(false);
                        backPressureStartTimeNs = System.nanoTime();
                        log.debug("[%s] Suspended reads from channel (chunkNum = %,d).", requestDesc, currentChunkNum);
                    }
                }
            }
        }

        private void finishRequest() {
            ClientResponse<Final> finalResponse = handler.done(response);
            if (!finalResponse.isFinished() || !finalResponse.isContinueReading()) {
                throw new ISE("[%s] Didn't get a completed ClientResponse Object from [%s] (finished = %s, continueReading = %s)", requestDesc, handler.getClass(), finalResponse.isFinished(), finalResponse.isContinueReading());
            }
            if (!retVal.isDone()) {
                retVal.set(finalResponse.getObj());
            }
            removeHandlers();
            channel.setReadable(true);
            channelResourceContainer.returnResource();
        }

        @Override
        public void exceptionCaught(ChannelHandlerContext context, ExceptionEvent event) {
            if (log.isDebugEnabled()) {
                final Throwable cause = event.getCause();
                if (cause == null) {
                    log.debug("[%s] Caught exception", requestDesc);
                } else {
                    log.debug(cause, "[%s] Caught exception", requestDesc);
                }
            }
            retVal.setException(event.getCause());
            // response is non-null if we received initial chunk and then exception occurs
            if (response != null) {
                handler.exceptionCaught(response, event.getCause());
            }
            try {
                if (channel.isOpen()) {
                    channel.close();
                }
            } catch (Exception e) {
                log.warn(e, "Error while closing channel");
            } finally {
                channelResourceContainer.returnResource();
            }
        }

        @Override
        public void channelDisconnected(ChannelHandlerContext context, ChannelStateEvent event) {
            if (log.isDebugEnabled()) {
                log.debug("[%s] Channel disconnected", requestDesc);
            }
            // response is non-null if we received initial chunk and then exception occurs
            if (response != null) {
                handler.exceptionCaught(response, new ChannelException("Channel disconnected"));
            }
            channel.close();
            channelResourceContainer.returnResource();
            if (!retVal.isDone()) {
                log.warn("[%s] Channel disconnected before response complete", requestDesc);
                retVal.setException(new ChannelException("Channel disconnected"));
            }
        }

        private void removeHandlers() {
            if (readTimeout > 0) {
                channel.getPipeline().remove(READ_TIMEOUT_HANDLER_NAME);
            }
            channel.getPipeline().remove(LAST_HANDLER_NAME);
        }
    });
    channel.write(httpRequest).addListener(new ChannelFutureListener() {

        @Override
        public void operationComplete(ChannelFuture future) {
            if (!future.isSuccess()) {
                channel.close();
                channelResourceContainer.returnResource();
                if (!retVal.isDone()) {
                    retVal.setException(new ChannelException(StringUtils.format("[%s] Failed to write request to channel", requestDesc), future.getCause()));
                }
            }
        }
    });
    return retVal;
}

Example 3 with ExceptionEvent

use of org.jboss.netty.channel.ExceptionEvent in project druid by druid-io.

the class ChannelResourceFactory method generate.

@Override
public ChannelFuture generate(final String hostname) {
    log.debug("Generating: %s", hostname);
    URL url;
    try {
        url = new URL(hostname);
    } catch (MalformedURLException e) {
        throw new RuntimeException(e);
    }
    final String host = url.getHost();
    final int port = url.getPort() == -1 ? url.getDefaultPort() : url.getPort();
    final ChannelFuture retVal;
    final ChannelFuture connectFuture;
    if (proxyConfig != null) {
        final ChannelFuture proxyFuture = bootstrap.connect(new InetSocketAddress(proxyConfig.getHost(), proxyConfig.getPort()));
        connectFuture = Channels.future(proxyFuture.getChannel());
        final String proxyUri = StringUtils.format("%s:%d", host, port);
        DefaultHttpRequest connectRequest = new DefaultHttpRequest(HttpVersion.HTTP_1_1, HttpMethod.CONNECT, proxyUri);
        if (proxyConfig.getUser() != null) {
            connectRequest.headers().add("Proxy-Authorization", Request.makeBasicAuthenticationString(proxyConfig.getUser(), proxyConfig.getPassword()));
        }
        proxyFuture.addListener(new ChannelFutureListener() {

            @Override
            public void operationComplete(ChannelFuture f1) {
                if (f1.isSuccess()) {
                    final Channel channel = f1.getChannel();
                    channel.getPipeline().addLast(DRUID_PROXY_HANDLER, new SimpleChannelUpstreamHandler() {

                        @Override
                        public void messageReceived(ChannelHandlerContext ctx, MessageEvent e) {
                            Object msg = e.getMessage();
                            final ChannelPipeline pipeline = ctx.getPipeline();
                            pipeline.remove(DRUID_PROXY_HANDLER);
                            if (msg instanceof HttpResponse) {
                                HttpResponse httpResponse = (HttpResponse) msg;
                                if (HttpResponseStatus.OK.equals(httpResponse.getStatus())) {
                                    // When the HttpClientCodec sees the CONNECT response complete, it goes into a "done"
                                    // mode which makes it just do nothing.  Swap it with a new instance that will cover
                                    // subsequent requests
                                    pipeline.replace("codec", "codec", new HttpClientCodec());
                                    connectFuture.setSuccess();
                                } else {
                                    connectFuture.setFailure(new ChannelException(StringUtils.format("Got status[%s] from CONNECT request to proxy[%s]", httpResponse.getStatus(), proxyUri)));
                                }
                            } else {
                                connectFuture.setFailure(new ChannelException(StringUtils.format("Got message of type[%s], don't know what to do.", msg.getClass())));
                            }
                        }
                    });
                    channel.write(connectRequest).addListener(new ChannelFutureListener() {

                        @Override
                        public void operationComplete(ChannelFuture f2) {
                            if (!f2.isSuccess()) {
                                connectFuture.setFailure(new ChannelException(StringUtils.format("Problem with CONNECT request to proxy[%s]", proxyUri), f2.getCause()));
                            }
                        }
                    });
                } else {
                    connectFuture.setFailure(new ChannelException(StringUtils.format("Problem connecting to proxy[%s]", proxyUri), f1.getCause()));
                }
            }
        });
    } else {
        connectFuture = bootstrap.connect(new InetSocketAddress(host, port));
    }
    if ("https".equals(url.getProtocol())) {
        if (sslContext == null) {
            throw new IllegalStateException("No sslContext set, cannot do https");
        }
        final SSLEngine sslEngine = sslContext.createSSLEngine(host, port);
        final SSLParameters sslParameters = new SSLParameters();
        sslParameters.setEndpointIdentificationAlgorithm("HTTPS");
        sslEngine.setSSLParameters(sslParameters);
        sslEngine.setUseClientMode(true);
        final SslHandler sslHandler = new SslHandler(sslEngine, SslHandler.getDefaultBufferPool(), false, timer, sslHandshakeTimeout);
        // https://github.com/netty/netty/issues/160
        sslHandler.setCloseOnSSLException(true);
        final ChannelFuture handshakeFuture = Channels.future(connectFuture.getChannel());
        connectFuture.getChannel().getPipeline().addLast("connectionErrorHandler", new SimpleChannelUpstreamHandler() {

            @Override
            public void exceptionCaught(ChannelHandlerContext ctx, ExceptionEvent e) {
                final Channel channel = ctx.getChannel();
                if (channel == null) {
                    // For the case where this pipeline is not attached yet.
                    handshakeFuture.setFailure(new ChannelException(StringUtils.format("Channel is null. The context name is [%s]", ctx.getName())));
                    return;
                }
                handshakeFuture.setFailure(e.getCause());
                if (channel.isOpen()) {
                    channel.close();
                }
            }
        });
        connectFuture.addListener(new ChannelFutureListener() {

            @Override
            public void operationComplete(ChannelFuture f) {
                if (f.isSuccess()) {
                    final ChannelPipeline pipeline = f.getChannel().getPipeline();
                    pipeline.addFirst("ssl", sslHandler);
                    sslHandler.handshake().addListener(new ChannelFutureListener() {

                        @Override
                        public void operationComplete(ChannelFuture f2) {
                            if (f2.isSuccess()) {
                                handshakeFuture.setSuccess();
                            } else {
                                handshakeFuture.setFailure(new ChannelException(StringUtils.format("Failed to handshake with host[%s]", hostname), f2.getCause()));
                            }
                        }
                    });
                } else {
                    handshakeFuture.setFailure(new ChannelException(StringUtils.format("Failed to connect to host[%s]", hostname), f.getCause()));
                }
            }
        });
        retVal = handshakeFuture;
    } else {
        retVal = connectFuture;
    }
    return retVal;
}