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// Copyright 2018 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.jdisc.http.server.jetty;
import com.yahoo.jdisc.http.server.jetty.JettyHttpServer.Metrics;
import org.eclipse.jetty.http.HttpStatus;
import org.eclipse.jetty.server.AsyncContextEvent;
import org.eclipse.jetty.server.Handler;
import org.eclipse.jetty.server.HttpChannelState;
import org.eclipse.jetty.server.Request;
import org.eclipse.jetty.server.handler.HandlerWrapper;
import org.eclipse.jetty.util.FutureCallback;
import org.eclipse.jetty.util.component.Graceful;
import javax.servlet.AsyncEvent;
import javax.servlet.AsyncListener;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.Future;
import java.util.concurrent.TimeoutException;
import java.util.concurrent.atomic.AtomicLong;
import java.util.concurrent.atomic.AtomicReference;
import java.util.concurrent.atomic.LongAdder;
/**
* HttpResponseStatisticsCollector collects statistics about HTTP response types aggregated by category (1xx, 2xx, etc). It is similar to
* {@link org.eclipse.jetty.server.handler.StatisticsHandler} with the distinction that this class collects response type statistics grouped
* by HTTP method and only collects the numbers that are reported as metrics from Vespa.
*
* @author ollivir
*/
public class HttpResponseStatisticsCollector extends HandlerWrapper implements Graceful {
private final AtomicReference<FutureCallback> shutdown = new AtomicReference<>();
public static enum HttpMethod {
GET, PATCH, POST, PUT, DELETE, OPTIONS, HEAD, OTHER
}
private static final String[] HTTP_RESPONSE_GROUPS = { Metrics.RESPONSES_1XX, Metrics.RESPONSES_2XX, Metrics.RESPONSES_3XX,
Metrics.RESPONSES_4XX, Metrics.RESPONSES_5XX };
private final AtomicLong inFlight = new AtomicLong();
private final LongAdder statistics[][];
public HttpResponseStatisticsCollector() {
super();
statistics = new LongAdder[HttpMethod.values().length][];
for (int method = 0; method < statistics.length; method++) {
statistics[method] = new LongAdder[HTTP_RESPONSE_GROUPS.length];
for (int group = 0; group < HTTP_RESPONSE_GROUPS.length; group++) {
statistics[method][group] = new LongAdder();
}
}
}
private final AsyncListener completionWatcher = new AsyncListener() {
@Override
public void onTimeout(AsyncEvent event) throws IOException {
}
@Override
public void onStartAsync(AsyncEvent event) throws IOException {
event.getAsyncContext().addListener(this);
}
@Override
public void onError(AsyncEvent event) throws IOException {
}
@Override
public void onComplete(AsyncEvent event) throws IOException {
HttpChannelState state = ((AsyncContextEvent) event).getHttpChannelState();
Request request = state.getBaseRequest();
observeEndOfRequest(request, null);
}
};
@Override
public void handle(String path, Request baseRequest, HttpServletRequest request, HttpServletResponse response)
throws IOException, ServletException {
inFlight.incrementAndGet();
/* The control flow logic here is mostly a copy from org.eclipse.jetty.server.handler.StatisticsHandler.handle(..) */
try {
Handler handler = getHandler();
if (handler != null && shutdown.get() == null && isStarted()) {
handler.handle(path, baseRequest, request, response);
} else if (!baseRequest.isHandled()) {
baseRequest.setHandled(true);
response.sendError(HttpStatus.SERVICE_UNAVAILABLE_503);
}
} finally {
HttpChannelState state = baseRequest.getHttpChannelState();
if (state.isSuspended()) {
if (state.isInitial()) {
state.addListener(completionWatcher);
}
} else if (state.isInitial()) {
observeEndOfRequest(baseRequest, response);
}
}
}
private void observeEndOfRequest(Request request, HttpServletResponse flushableResponse) throws IOException {
int group = groupIndex(request);
if (group >= 0) {
HttpMethod method = getMethod(request);
statistics[method.ordinal()][group].increment();
}
long live = inFlight.decrementAndGet();
FutureCallback shutdownCb = shutdown.get();
if (shutdownCb != null) {
if (flushableResponse != null) {
flushableResponse.flushBuffer();
}
if (live == 0) {
shutdownCb.succeeded();
}
}
}
private int groupIndex(Request request) {
if (request.isHandled()) {
int index = (request.getResponse().getStatus() / 100) - 1; // 1xx = 0, 2xx = 1 etc.
if (index < 0 || index > statistics.length) {
return -1;
} else {
return index;
}
} else {
return 3; // 4xx
}
}
private HttpMethod getMethod(Request request) {
switch (request.getMethod()) {
case "GET":
return HttpMethod.GET;
case "PATCH":
return HttpMethod.PATCH;
case "POST":
return HttpMethod.POST;
case "PUT":
return HttpMethod.PUT;
case "DELETE":
return HttpMethod.DELETE;
case "OPTIONS":
return HttpMethod.OPTIONS;
case "HEAD":
return HttpMethod.HEAD;
default:
return HttpMethod.OTHER;
}
}
public Map<String, Map<String, Long>> takeStatisticsByMethod() {
Map<String, Map<String, Long>> ret = new HashMap<>();
for (HttpMethod method : HttpMethod.values()) {
int methodIndex = method.ordinal();
Map<String, Long> methodStats = new HashMap<>();
ret.put(method.toString(), methodStats);
for (int group = 0; group < HTTP_RESPONSE_GROUPS.length; group++) {
long value = statistics[methodIndex][group].sumThenReset();
methodStats.put(HTTP_RESPONSE_GROUPS[group], value);
}
}
return ret;
}
@Override
protected void doStart() throws Exception {
shutdown.set(null);
super.doStart();
}
@Override
protected void doStop() throws Exception {
super.doStop();
FutureCallback shutdownCb = shutdown.get();
if (shutdown != null && !shutdownCb.isDone()) {
shutdownCb.failed(new TimeoutException());
}
}
@Override
public Future<Void> shutdown() {
/* This shutdown callback logic is a copy from org.eclipse.jetty.server.handler.StatisticsHandler */
FutureCallback shutdownCb = new FutureCallback(false);
shutdown.compareAndSet(null, shutdownCb);
shutdownCb = shutdown.get();
if (inFlight.get() == 0) {
shutdownCb.succeeded();
}
return shutdownCb;
}
@Override
public boolean isShutdown() {
FutureCallback futureCallback = shutdown.get();
return futureCallback != null && futureCallback.isDone();
}
}
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