org.springframework.cloud.netflix.turbine.stream.TurbineStreamConfiguration.java Source code

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Here is the source code for org.springframework.cloud.netflix.turbine.stream.TurbineStreamConfiguration.java

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/*
 * Copyright 2013-2017 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.springframework.cloud.netflix.turbine.stream;

import java.nio.charset.StandardCharsets;
import java.util.Collections;
import java.util.Map;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicBoolean;

import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.reactivex.netty.RxNetty;
import io.reactivex.netty.protocol.http.server.HttpServer;
import io.reactivex.netty.protocol.http.sse.ServerSentEvent;

import com.netflix.turbine.aggregator.InstanceKey;
import com.netflix.turbine.aggregator.StreamAggregator;
import com.netflix.turbine.internal.JsonUtility;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.cloud.client.actuator.HasFeatures;
import org.springframework.context.SmartLifecycle;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.util.SocketUtils;

import static io.reactivex.netty.pipeline.PipelineConfigurators.serveSseConfigurator;

import rx.Observable;
import rx.subjects.PublishSubject;

/**
 * @author Spencer Gibb
 */
@Configuration
@EnableConfigurationProperties(TurbineStreamProperties.class)
public class TurbineStreamConfiguration implements SmartLifecycle {

    private static final Log log = LogFactory.getLog(TurbineStreamConfiguration.class);

    private AtomicBoolean running = new AtomicBoolean(false);

    @Autowired
    private TurbineStreamProperties properties;

    private int turbinePort;

    @Bean
    public HasFeatures Feature() {
        return HasFeatures.namedFeature("Turbine (Stream)", TurbineStreamProperties.class);
    }

    @Bean
    public PublishSubject<Map<String, Object>> hystrixSubject() {
        return PublishSubject.create();
    }

    @Bean
    @SuppressWarnings("deprecation")
    public HttpServer<ByteBuf, ServerSentEvent> aggregatorServer() {
        // multicast so multiple concurrent subscribers get the same stream
        Observable<Map<String, Object>> publishedStreams = StreamAggregator
                .aggregateGroupedStreams(
                        hystrixSubject().groupBy(data -> InstanceKey.create((String) data.get("instanceId"))))
                .doOnUnsubscribe(() -> log.info("Unsubscribing aggregation."))
                .doOnSubscribe(() -> log.info("Starting aggregation")).flatMap(o -> o).publish().refCount();
        Observable<Map<String, Object>> ping = Observable.timer(1, 10, TimeUnit.SECONDS)
                .map(count -> Collections.singletonMap("type", (Object) "Ping")).publish().refCount();
        Observable<Map<String, Object>> output = Observable.merge(publishedStreams, ping);

        this.turbinePort = this.properties.getPort();

        if (this.turbinePort <= 0) {
            this.turbinePort = SocketUtils.findAvailableTcpPort(40000);
        }

        HttpServer<ByteBuf, ServerSentEvent> httpServer = RxNetty.createHttpServer(this.turbinePort,
                (request, response) -> {
                    log.info("SSE Request Received");
                    response.getHeaders().setHeader("Content-Type", "text/event-stream");
                    return output.doOnUnsubscribe(() -> log.info("Unsubscribing RxNetty server connection"))
                            .flatMap(data -> response.writeAndFlush(new ServerSentEvent(
                                    Unpooled.copiedBuffer(JsonUtility.mapToJson(data), StandardCharsets.UTF_8))));
                }, serveSseConfigurator());
        return httpServer;
    }

    @Override
    public boolean isAutoStartup() {
        return true;
    }

    @Override
    public void stop(Runnable callback) {
        stop();
        callback.run();
    }

    @Override
    public void start() {
        if (this.running.compareAndSet(false, true)) {
            aggregatorServer().start();
        }
    }

    @Override
    public void stop() {
        if (this.running.compareAndSet(true, false)) {
            try {
                aggregatorServer().shutdown();
            } catch (InterruptedException ex) {
                log.error("Error shutting down", ex);
            }
        }
    }

    @Override
    public boolean isRunning() {
        return this.running.get();
    }

    @Override
    public int getPhase() {
        return 0;
    }

    public int getTurbinePort() {
        return this.turbinePort;
    }

}