Examples with HttpServerResponse mantis.io.reactivex.netty.protocol.http.server.HttpServerResponse used on opensource projects

Example 1 with HttpServerResponse

use of mantis.io.reactivex.netty.protocol.http.server.HttpServerResponse in project mantis by Netflix.

the class TestSseServerFactory method newServerWithInitialData.

public static int newServerWithInitialData(final int port, final String data) {
    final HttpServer<String, ServerSentEvent> server = RxNetty.newHttpServerBuilder(port, new RequestHandler<String, ServerSentEvent>() {

        @Override
        public Observable<Void> handle(HttpServerRequest<String> req, HttpServerResponse<ServerSentEvent> resp) {
            final ByteBuf byteBuf = resp.getAllocator().buffer().writeBytes(data.getBytes());
            resp.writeAndFlush(new ServerSentEvent(byteBuf));
            return Observable.empty();
        }
    }).pipelineConfigurator(PipelineConfigurators.<String>serveSseConfigurator()).channelOption(ChannelOption.WRITE_BUFFER_WATER_MARK, new WriteBufferWaterMark(1024 * 1024, 5 * 1024 * 1024)).build();
    server.start();
    synchronized (servers) {
        servers.add(server);
    }
    return port;
}

Example 2 with HttpServerResponse

use of mantis.io.reactivex.netty.protocol.http.server.HttpServerResponse in project mantis by Netflix.

the class PushServerSse method createServer.

@Override
public RxServer<?, ?> createServer() {
    RxServer<HttpServerRequest<String>, HttpServerResponse<ServerSentEvent>> server = RxNetty.newHttpServerBuilder(port, new RequestHandler<String, ServerSentEvent>() {

        @Override
        public Observable<Void> handle(HttpServerRequest<String> request, final HttpServerResponse<ServerSentEvent> response) {
            final Map<String, List<String>> queryParameters = request.getQueryParameters();
            final Counter sseProcessedCounter;
            final Counter sseDroppedCounter;
            // heartbeat state
            boolean enableHeartbeats = false;
            boolean enableBinaryOutput = false;
            final AtomicLong heartBeatReadIdleSec = new AtomicLong(2);
            SerializedSubject<String, String> metaMsgSubject = PublishSubject.<String>create().toSerialized();
            final AtomicLong metaMessagesFreqMSec = new AtomicLong(1000);
            boolean enableMetaMessages = false;
            final AtomicLong lastWriteTime = new AtomicLong();
            Subscription heartbeatSubscription = null;
            Subscription metaMsgSubscription = null;
            // sample state
            boolean enableSampling = false;
            long samplingTimeMsec = 0;
            // client state
            String groupId = null;
            String slotId = null;
            String id = null;
            Func1<T, Boolean> predicateFunction = null;
            if (predicate != null) {
                predicateFunction = predicate.call(queryParameters);
            }
            byte[] delimiter = CompressionUtils.MANTIS_SSE_DELIMITER_BINARY;
            if (queryParameters != null && !queryParameters.isEmpty()) {
                if (queryParameters.containsKey(MantisSSEConstants.ID)) {
                    id = queryParameters.get(MantisSSEConstants.ID).get(0);
                }
                if (queryParameters.containsKey(MantisSSEConstants.SLOT_ID)) {
                    slotId = queryParameters.get(MantisSSEConstants.SLOT_ID).get(0);
                }
                // support groupId and clientId for grouping
                if (queryParameters.containsKey(MantisSSEConstants.GROUP_ID)) {
                    groupId = queryParameters.get(MantisSSEConstants.GROUP_ID).get(0);
                }
                if (queryParameters.containsKey(MantisSSEConstants.CLIENT_ID)) {
                    groupId = queryParameters.get(MantisSSEConstants.CLIENT_ID).get(0);
                }
                if (queryParameters.containsKey(MantisSSEConstants.HEARTBEAT_SEC)) {
                    heartBeatReadIdleSec.set(Long.parseLong(queryParameters.get(MantisSSEConstants.HEARTBEAT_SEC).get(0)));
                    if (heartBeatReadIdleSec.get() < 1) {
                        throw new IllegalArgumentException("Sampling rate too low: " + samplingTimeMsec);
                    }
                    enableHeartbeats = true;
                }
                if (queryParameters != null && queryParameters.containsKey(MantisSSEConstants.MANTIS_ENABLE_COMPRESSION)) {
                    String enableBinaryOutputStr = queryParameters.get(MantisSSEConstants.MANTIS_ENABLE_COMPRESSION).get(0);
                    if ("true".equalsIgnoreCase(enableBinaryOutputStr)) {
                        logger.info("Binary compression requested");
                        enableBinaryOutput = true;
                    }
                }
                if (queryParameters.containsKey(MantisSSEConstants.ENABLE_PINGS)) {
                    String enablePings = queryParameters.get(MantisSSEConstants.ENABLE_PINGS).get(0);
                    if ("true".equalsIgnoreCase(enablePings)) {
                        enableHeartbeats = true;
                    }
                }
                if (queryParameters.containsKey(MantisSSEConstants.ENABLE_META_MESSAGES)) {
                    String enableMetaMessagesStr = queryParameters.get(MantisSSEConstants.ENABLE_META_MESSAGES).get(0);
                    if ("true".equalsIgnoreCase(enableMetaMessagesStr)) {
                        enableMetaMessages = true;
                    }
                }
                if (queryParameters.containsKey(MantisSSEConstants.META_MESSAGES_SEC)) {
                    metaMessagesFreqMSec.set(Long.parseLong(queryParameters.get(MantisSSEConstants.META_MESSAGES_SEC).get(0)));
                    if (metaMessagesFreqMSec.get() < 250) {
                        throw new IllegalArgumentException("Meta message frequence rate too low: " + metaMessagesFreqMSec.get());
                    }
                    enableMetaMessages = true;
                }
                if (queryParameters.containsKey(MantisSSEConstants.SAMPLE)) {
                    samplingTimeMsec = Long.parseLong(queryParameters.get(MantisSSEConstants.SAMPLE).get(0)) * 1000;
                    if (samplingTimeMsec < 50) {
                        throw new IllegalArgumentException("Sampling rate too low: " + samplingTimeMsec);
                    }
                    enableSampling = true;
                }
                if (queryParameters.containsKey(MantisSSEConstants.SAMPLE_M_SEC)) {
                    samplingTimeMsec = Long.parseLong(queryParameters.get(MantisSSEConstants.SAMPLE_M_SEC).get(0));
                    if (samplingTimeMsec < 50) {
                        throw new IllegalArgumentException("Sampling rate too low: " + samplingTimeMsec);
                    }
                    enableSampling = true;
                }
                if (queryParameters.containsKey(MantisSSEConstants.MANTIS_COMPRESSION_DELIMITER)) {
                    String rawDelimiter = queryParameters.get(MantisSSEConstants.MANTIS_COMPRESSION_DELIMITER).get(0);
                    if (rawDelimiter != null && !rawDelimiter.isEmpty()) {
                        delimiter = rawDelimiter.getBytes();
                    }
                }
                if (queryParameters.containsKey(MantisSSEConstants.MQL)) {
                    String query = queryParameters.get(MantisSSEConstants.MQL).get(0);
                    if ((Boolean) mqlParses.invoke(query)) {
                        Query q = (Query) mqlMakeQuery.invoke(groupId, query);
                        predicateFunction = (T datum) -> datum instanceof Map ? q.matches((Map) datum) : true;
                    }
                }
            }
            InetSocketAddress socketAddress = (InetSocketAddress) response.getChannel().remoteAddress();
            Metrics metrics;
            if (groupId == null) {
                String address = socketAddress.getAddress().toString();
                metrics = registerSseMetrics(address, address);
            } else {
                metrics = registerSseMetrics(groupId, socketAddress.getAddress().toString());
            }
            sseProcessedCounter = metrics.getCounter(PROCESSED_COUNTER_METRIC_NAME);
            sseDroppedCounter = metrics.getCounter(DROPPED_COUNTER_METRIC_NAME);
            response.getHeaders().set("Access-Control-Allow-Origin", "*");
            response.getHeaders().set("content-type", "text/event-stream");
            response.getHeaders().set("Cache-Control", "no-cache, no-store, max-age=0, must-revalidate");
            response.getHeaders().set("Pragma", "no-cache");
            response.flush();
            if (queryParameters != null && requestPreprocessor != null) {
                requestPreprocessor.call(queryParameters, processorState);
            }
            if (enableMetaMessages && metaMessagesFreqMSec.get() > 0) {
                logger.info("Enabling Meta messages, interval : " + metaMessagesFreqMSec.get() + " ms");
                metaMsgSubscription = metaMsgSubject.throttleLast(metaMessagesFreqMSec.get(), TimeUnit.MILLISECONDS).doOnNext((String t) -> {
                    if (t != null && !t.isEmpty()) {
                        long currentTime = System.currentTimeMillis();
                        ByteBuf data = response.getAllocator().buffer().writeBytes(t.getBytes());
                        response.writeAndFlush(new ServerSentEvent(data));
                        lastWriteTime.set(currentTime);
                    }
                }).subscribe();
            }
            if (enableHeartbeats && heartBeatReadIdleSec.get() > 0) {
                logger.info("Enabling hearts, interval: " + heartBeatReadIdleSec);
                heartbeatSubscription = Observable.interval(2, heartBeatReadIdleSec.get(), TimeUnit.SECONDS).doOnNext((Long t1) -> {
                    long currentTime = System.currentTimeMillis();
                    long diff = (currentTime - lastWriteTime.get()) / 1000;
                    if (diff > heartBeatReadIdleSec.get()) {
                        ByteBuf data = response.getAllocator().buffer().writeBytes("ping".getBytes());
                        response.writeAndFlush(new ServerSentEvent(data));
                        lastWriteTime.set(currentTime);
                    }
                }).subscribe();
            }
            Action0 connectionClosedCallback = null;
            if (queryParameters != null && requestPostprocessor != null) {
                connectionClosedCallback = new Action0() {

                    @Override
                    public void call() {
                        requestPostprocessor.call(queryParameters, processorState);
                    }
                };
            }
            class SubscribeCallback implements Action0 {

                @Override
                public void call() {
                    if (queryParameters != null && subscribeProcessor != null) {
                        subscribeProcessor.call(queryParameters, processorState);
                    }
                }
            }
            return manageConnectionWithCompression(response, socketAddress.getHostString(), socketAddress.getPort(), groupId, slotId, id, lastWriteTime, enableHeartbeats, heartbeatSubscription, enableSampling, samplingTimeMsec, metaMsgSubject, metaMsgSubscription, predicateFunction, connectionClosedCallback, sseProcessedCounter, sseDroppedCounter, new SubscribeCallback(), enableBinaryOutput, true, delimiter);
        }
    }).pipelineConfigurator(PipelineConfigurators.serveSseConfigurator()).channelOption(ChannelOption.WRITE_BUFFER_WATER_MARK, new WriteBufferWaterMark(1024 * 1024, 5 * 1024 * 1024)).build();
    return server;
}

Example 3 with HttpServerResponse

use of mantis.io.reactivex.netty.protocol.http.server.HttpServerResponse in project mantis by Netflix.

the class ServerSentEventRequestHandler method handle.

@Override
public Observable<Void> handle(HttpServerRequest<ByteBuf> request, final HttpServerResponse<ServerSentEvent> response) {
    InetSocketAddress socketAddress = (InetSocketAddress) response.getChannel().remoteAddress();
    LOG.info("HTTP SSE connection received from " + socketAddress.getAddress() + ":" + socketAddress.getPort() + "  queryParams: " + request.getQueryParameters());
    final String socketAddrStr = socketAddress.getAddress().toString();
    final WritableEndpoint<String> sn = new WritableEndpoint<>(socketAddress.getHostString(), socketAddress.getPort(), Endpoint.uniqueHost(socketAddress.getHostString(), socketAddress.getPort(), null));
    final Map<String, List<String>> queryParameters = request.getQueryParameters();
    final SlotAssignmentManager<String> slotMgr = ssm.registerServer(sn, queryParameters);
    final AtomicLong lastResponseFlush = new AtomicLong();
    lastResponseFlush.set(-1);
    final AtomicLong lastResponseSent = new AtomicLong(-1);
    // copy reference, then apply request specific filters, sampling
    Observable<T> requestObservable = observableToServe;
    // decouple the observable on a separate thread and add backpressure handling
    // ServiceRegistry.INSTANCE.getPropertiesService().getStringValue("sse.decouple", "false");
    String decoupleSSE = "false";
    if ("true".equals(decoupleSSE)) {
        final BasicTag sockAddrTag = new BasicTag("sockAddr", Optional.ofNullable(socketAddrStr).orElse("none"));
        requestObservable = requestObservable.lift(new DropOperator<T>("outgoing_ServerSentEventRequestHandler", sockAddrTag)).observeOn(Schedulers.io());
    }
    response.getHeaders().set("Access-Control-Allow-Origin", "*");
    response.getHeaders().set("content-type", "text/event-stream");
    response.getHeaders().set("Cache-Control", "no-cache, no-store, max-age=0, must-revalidate");
    response.getHeaders().set("Pragma", "no-cache");
    response.flush();
    String uniqueClientId = socketAddrStr;
    if (queryParameters != null && queryParameters.containsKey(CLIENT_ID_PARAM)) {
        // enablePings
        uniqueClientId = queryParameters.get(CLIENT_ID_PARAM).get(0);
    }
    if (queryParameters != null && queryParameters.containsKey(FORMAT_PARAM)) {
        format = queryParameters.get(FORMAT_PARAM).get(0);
    }
    if (queryParameters != null && requestPreprocessor != null) {
        requestPreprocessor.call(queryParameters, context);
    }
    // apply sampling, milli, then seconds
    if (queryParameters != null && queryParameters.containsKey(SAMPLE_PARAM_MSEC)) {
        // apply sampling rate
        int samplingRate = Integer.parseInt(queryParameters.get(SAMPLE_PARAM_MSEC).get(0));
        requestObservable = requestObservable.sample(samplingRate, TimeUnit.MILLISECONDS);
    }
    if (queryParameters != null && queryParameters.containsKey(SAMPLE_PARAM)) {
        // apply sampling rate
        int samplingRate = Integer.parseInt(queryParameters.get(SAMPLE_PARAM).get(0));
        requestObservable = requestObservable.sample(samplingRate, TimeUnit.SECONDS);
    }
    if (queryParameters != null && queryParameters.containsKey(ENABLE_PINGS_PARAM)) {
        // enablePings
        String enablePings = queryParameters.get(ENABLE_PINGS_PARAM).get(0);
        if ("true".equalsIgnoreCase(enablePings)) {
            pingsEnabled = true;
        } else {
            pingsEnabled = false;
        }
    }
    if (queryParameters != null && queryParameters.containsKey("delay")) {
        // apply flush
        try {
            int flushInterval = Integer.parseInt(queryParameters.get("delay").get(0));
            if (flushInterval >= 50) {
                flushIntervalMillis = flushInterval;
            } else {
                LOG.warn("delay parameter too small " + flushInterval + " min. is 100");
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
    final byte[] delimiter = queryParameters != null && queryParameters.containsKey(MantisSSEConstants.MANTIS_COMPRESSION_DELIMITER) && queryParameters.get(MantisSSEConstants.MANTIS_COMPRESSION_DELIMITER).get(0) != null ? queryParameters.get(MantisSSEConstants.MANTIS_COMPRESSION_DELIMITER).get(0).getBytes() : null;
    Tag[] tags = new Tag[2];
    final String clientId = Optional.ofNullable(uniqueClientId).orElse("none");
    final String sockAddr = Optional.ofNullable(socketAddrStr).orElse("none");
    tags[0] = new BasicTag("clientId", clientId);
    tags[1] = new BasicTag("sockAddr", sockAddr);
    Metrics sseSinkMetrics = new Metrics.Builder().id("ServerSentEventRequestHandler", tags).addCounter("processedCounter").addCounter("pingCounter").addCounter("errorCounter").addCounter("droppedCounter").addCounter("flushCounter").build();
    final Counter msgProcessedCounter = sseSinkMetrics.getCounter("processedCounter");
    final Counter pingCounter = sseSinkMetrics.getCounter("pingCounter");
    final Counter errorCounter = sseSinkMetrics.getCounter("errorCounter");
    final Counter droppedWrites = sseSinkMetrics.getCounter("droppedCounter");
    final Counter flushCounter = sseSinkMetrics.getCounter("flushCounter");
    // get predicate, defaults to return true for all T
    Func1<T, Boolean> filterFunction = new Func1<T, Boolean>() {

        @Override
        public Boolean call(T t1) {
            return true;
        }
    };
    if (queryParameters != null && predicate != null) {
        filterFunction = predicate.getPredicate().call(queryParameters);
    }
    final Subscription timerSubscription = Observable.interval(1, TimeUnit.SECONDS).doOnNext(new Action1<Long>() {

        @Override
        public void call(Long t1) {
            long currentTime = System.currentTimeMillis();
            if (pingsEnabled && (lastResponseSent.get() == -1 || currentTime > lastResponseSent.get() + PING_INTERVAL)) {
                pingCounter.increment();
                response.writeStringAndFlush(PING);
                lastResponseSent.set(currentTime);
            }
        }
    }).subscribe();
    return requestObservable.filter(filterFunction).map(encoder).lift(new DisableBackPressureOperator<String>()).buffer(flushIntervalMillis, TimeUnit.MILLISECONDS).flatMap(new Func1<List<String>, Observable<Void>>() {

        @Override
        public Observable<Void> call(List<String> valueList) {
            if (response.isCloseIssued() || !response.getChannel().isActive()) {
                LOG.info("Client closed detected, throwing closed channel exception");
                return Observable.error(new ClosedChannelException());
            }
            List<String> filteredList = valueList.stream().filter(e -> {
                return slotMgr.filter(sn, e.getBytes());
            }).collect(Collectors.toList());
            if (response.getChannel().isWritable()) {
                flushCounter.increment();
                if (format.equals(BINARY_FORMAT)) {
                    boolean useSnappy = true;
                    try {
                        String compressedList = delimiter == null ? CompressionUtils.compressAndBase64Encode(filteredList, useSnappy) : CompressionUtils.compressAndBase64Encode(filteredList, useSnappy, delimiter);
                        StringBuilder sb = new StringBuilder(3);
                        sb.append(SSE_DATA_PREFIX);
                        sb.append(compressedList);
                        sb.append(TWO_NEWLINES);
                        msgProcessedCounter.increment(valueList.size());
                        lastResponseSent.set(System.currentTimeMillis());
                        return response.writeStringAndFlush(sb.toString());
                    } catch (Exception e) {
                        LOG.warn("Could not compress data" + e.getMessage());
                        droppedWrites.increment(valueList.size());
                        return Observable.empty();
                    }
                } else {
                    int noOfMsgs = 0;
                    StringBuilder sb = new StringBuilder(valueList.size() * 3);
                    for (String s : filteredList) {
                        sb.append(SSE_DATA_PREFIX);
                        sb.append(s);
                        sb.append(TWO_NEWLINES);
                        noOfMsgs++;
                    }
                    msgProcessedCounter.increment(noOfMsgs);
                    lastResponseSent.set(System.currentTimeMillis());
                    return response.writeStringAndFlush(sb.toString());
                }
            } else {
                // 
                droppedWrites.increment(filteredList.size());
            }
            return Observable.empty();
        }
    }).onErrorResumeNext(new Func1<Throwable, Observable<? extends Void>>() {

        @Override
        public Observable<? extends Void> call(Throwable throwable) {
            Throwable cause = throwable.getCause();
            // ignore closed channel exceptions, this is
            // when the connection was closed on the client
            // side without informing the server
            errorCounter.increment();
            if (cause != null && !(cause instanceof ClosedChannelException)) {
                LOG.warn("Error detected in SSE sink", cause);
                if (errorEncoder != null) {
                    // write error out on connection
                    // response.writeAndFlush(errorEncoder.call(throwable));
                    ByteBuf errType = response.getAllocator().buffer().writeBytes("error: ".getBytes());
                    ByteBuf errRes = response.getAllocator().buffer().writeBytes((errorEncoder.call(throwable)).getBytes());
                    response.writeAndFlush(ServerSentEvent.withEventType(errType, errRes));
                }
                throwable.printStackTrace();
            }
            if (requestPostprocessor != null && queryParameters != null) {
                requestPostprocessor.call(queryParameters, context);
            }
            ssm.deregisterServer(sn, queryParameters);
            timerSubscription.unsubscribe();
            return Observable.error(throwable);
        }
    });
}