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/*
* Copyright 2019 Netflix, Inc.
*
* 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 io.mantisrx.common.metrics;
import io.mantisrx.common.metrics.measurement.CounterMeasurement;
import io.mantisrx.common.metrics.measurement.GaugeMeasurement;
import io.mantisrx.common.metrics.measurement.Measurements;
import io.mantisrx.common.metrics.spectator.MetricId;
import io.mantisrx.shaded.com.fasterxml.jackson.core.JsonProcessingException;
import io.mantisrx.shaded.com.fasterxml.jackson.databind.DeserializationFeature;
import io.mantisrx.shaded.com.fasterxml.jackson.databind.ObjectMapper;
import io.mantisrx.shaded.com.fasterxml.jackson.datatype.jdk8.Jdk8Module;
import io.netty.buffer.ByteBuf;
import java.util.ArrayList;
import java.util.Collection;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.concurrent.TimeUnit;
import mantis.io.reactivex.netty.RxNetty;
import mantis.io.reactivex.netty.pipeline.PipelineConfigurators;
import mantis.io.reactivex.netty.protocol.http.server.HttpServer;
import mantis.io.reactivex.netty.protocol.http.server.HttpServerRequest;
import mantis.io.reactivex.netty.protocol.http.server.HttpServerResponse;
import mantis.io.reactivex.netty.protocol.http.server.RequestHandler;
import mantis.io.reactivex.netty.protocol.http.sse.ServerSentEvent;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import rx.Observable;
import rx.functions.Func1;
public class MetricsServer {
private static final Logger logger = LoggerFactory.getLogger(MetricsServer.class);
private final ObjectMapper mapper = new ObjectMapper();
private HttpServer server;
private int port;
private Map tags;
private long publishRateInSeconds;
public MetricsServer(int port, long publishRateInSeconds, Map tags) {
this.port = port;
this.publishRateInSeconds = publishRateInSeconds;
this.tags = tags;
mapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
mapper.registerModule(new Jdk8Module());
}
private Observable measurements(long timeFrequency) {
final MetricsRegistry registry = MetricsRegistry.getInstance();
return
Observable.interval(0, timeFrequency, TimeUnit.SECONDS)
.flatMap(new Func1>() {
@Override
public Observable call(Long t1) {
long timestamp = System.currentTimeMillis();
List measurements = new ArrayList<>();
for (Metrics metrics : registry.metrics()) {
Collection counters = new LinkedList<>();
Collection gauges = new LinkedList<>();
for (Entry counterEntry : metrics.counters().entrySet()) {
Counter counter = counterEntry.getValue();
counters.add(new CounterMeasurement(counterEntry.getKey().metricName(), counter.value()));
}
for (Entry gaugeEntry : metrics.gauges().entrySet()) {
gauges.add(new GaugeMeasurement(gaugeEntry.getKey().metricName(), gaugeEntry.getValue().doubleValue()));
}
measurements.add(new Measurements(metrics.getMetricGroupId().id(),
timestamp, counters, gauges, tags));
}
return Observable.from(measurements);
}
});
}
public void start() {
final Observable measurements = measurements(publishRateInSeconds);
logger.info("Starting metrics server on port: " + port);
server = RxNetty.createHttpServer(
port,
new RequestHandler() {
@Override
public Observable handle(HttpServerRequest request, final HttpServerResponse response) {
final Map> queryParameters = request.getQueryParameters();
final List namesToFilter = new LinkedList<>();
logger.info("got query params {}", queryParameters);
if (queryParameters != null && queryParameters.containsKey("name")) {
namesToFilter.addAll(queryParameters.get("name"));
}
Observable filteredObservable = measurements
.filter(new Func1() {
@Override
public Boolean call(Measurements measurements) {
if (!namesToFilter.isEmpty()) {
// check filters
for (String name : namesToFilter) {
if (name.indexOf('*') != -1) {
// check for ends with
if (name.indexOf('*') == 0 && measurements.getName().endsWith(name.substring(1)))
return true;
// check for starts with
if (name.indexOf('*') > 0 && measurements.getName().startsWith(name.substring(0, name.indexOf('*')))) {
return true;
}
}
if (measurements.getName().equals(name)) {
return true; // filter match
}
}
return false; // not found in filters
} else {
return true; // no filters provided
}
}
});
return filteredObservable.flatMap(new Func1>() {
@Override
public Observable call(Measurements metrics) {
response.getHeaders().set("Access-Control-Allow-Origin", "*");
response.getHeaders().set("content-type", "text/event-stream");
ServerSentEvent event = null;
try {
ByteBuf data = response.getAllocator().buffer().writeBytes((mapper.writeValueAsString(metrics)).getBytes());
event = new ServerSentEvent(data);
//event = new ServerSentEvent(null, "data", mapper.writeValueAsString(metrics));
} catch (JsonProcessingException e) {
logger.error("Failed to map metrics to JSON", e);
}
if (event != null) {
response.write(event);
return response.writeStringAndFlush("\n");
}
return null;
}
});
}
},
PipelineConfigurators.serveSseConfigurator()
).start();
}
public void shutdown() {
if (server != null) {
logger.info("Shutting down metrics server on port");
logger.info("Waiting (2 x push-period) to flush buffers, before shut down.");
try {
TimeUnit.SECONDS.sleep(2);
server.shutdown();
} catch (InterruptedException e) {
logger.warn("Failed to shutdown metrics server", e);
}
}
}
}
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