/*
* Copyright 2013-2015 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.util.Collections;
import java.util.Map;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicBoolean;
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 com.netflix.turbine.aggregator.InstanceKey;
import com.netflix.turbine.aggregator.StreamAggregator;
import com.netflix.turbine.internal.JsonUtility;
import static io.reactivex.netty.pipeline.PipelineConfigurators.sseServerConfigurator;
import io.netty.buffer.ByteBuf;
import io.reactivex.netty.RxNetty;
import io.reactivex.netty.protocol.http.server.HttpServer;
import io.reactivex.netty.protocol.text.sse.ServerSentEvent;
import lombok.extern.apachecommons.CommonsLog;
import rx.Observable;
import rx.subjects.PublishSubject;
/**
* @author Spencer Gibb
*/
@Configuration
@CommonsLog
@EnableConfigurationProperties(TurbineStreamProperties.class)
public class TurbineStreamConfiguration implements SmartLifecycle {
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(
null, null, JsonUtility.mapToJson(data))));
}, sseServerConfigurator());
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;
}
}