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// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.http.server;
import com.yahoo.collections.Tuple2;
import com.yahoo.concurrent.ThreadFactoryFactory;
import com.yahoo.container.handler.ThreadpoolConfig;
import com.yahoo.container.jdisc.HttpRequest;
import com.yahoo.container.jdisc.HttpResponse;
import com.yahoo.container.jdisc.LoggingRequestHandler;
import com.yahoo.container.jdisc.messagebus.SessionCache;
import com.yahoo.document.DocumentTypeManager;
import com.yahoo.document.config.DocumentmanagerConfig;
import com.yahoo.documentapi.metrics.DocumentApiMetrics;
import com.yahoo.jdisc.Metric;
import com.yahoo.jdisc.http.HttpResponse.Status;
import com.yahoo.log.LogLevel;
import com.yahoo.messagebus.ReplyHandler;
import com.yahoo.messagebus.SourceSessionParams;
import com.yahoo.metrics.simple.MetricReceiver;
import com.yahoo.net.HostName;
import com.yahoo.vespa.http.client.core.Headers;
import com.yahoo.vespa.http.client.core.OperationStatus;
import com.yahoo.yolean.Exceptions;
import javax.inject.Inject;
import java.io.IOException;
import java.io.InputStream;
import java.net.InetSocketAddress;
import java.net.SocketAddress;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.ScheduledThreadPoolExecutor;
import java.util.concurrent.ThreadLocalRandom;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicLong;
import java.util.zip.GZIPInputStream;
/**
* Accept feeds from outside of the Vespa cluster.
*
* @author Steinar Knutsen
*/
public class FeedHandler extends LoggingRequestHandler {
protected final ReplyHandler feedReplyHandler;
private static final List<Integer> serverSupportedVersions = Collections.unmodifiableList(Arrays.asList(3));
private final FeedHandlerV3 feedHandlerV3;
@Inject
public FeedHandler(
LoggingRequestHandler.Context parentCtx,
DocumentmanagerConfig documentManagerConfig,
SessionCache sessionCache,
ThreadpoolConfig threadpoolConfig,
MetricReceiver metricReceiver) throws Exception {
super(parentCtx);
DocumentApiMetrics metricsHelper = new DocumentApiMetrics(metricReceiver, "vespa.http.server");
feedHandlerV3 = new FeedHandlerV3(parentCtx, documentManagerConfig, sessionCache, threadpoolConfig, metricsHelper);
feedReplyHandler = new FeedReplyReader(parentCtx.getMetric(), metricsHelper);
}
private Tuple2<HttpResponse, Integer> checkProtocolVersion(HttpRequest request) {
return doCheckProtocolVersion(request.getJDiscRequest().headers().get(Headers.VERSION));
}
static Tuple2<HttpResponse, Integer> doCheckProtocolVersion(List<String> clientSupportedVersions) {
List<String> washedClientVersions = splitVersions(clientSupportedVersions);
if (washedClientVersions == null || washedClientVersions.isEmpty()) {
return new Tuple2<>(new ErrorHttpResponse(
Headers.HTTP_NOT_ACCEPTABLE,
"Request did not contain " + Headers.VERSION
+ "header. Server supports protocol versions "
+ serverSupportedVersions), -1);
}
//select the highest version supported by both parties
//this could be extended when we support a gazillion versions - but right now: keep it simple.
int version;
if (washedClientVersions.contains("3")) {
version = 3;
} else {
return new Tuple2<>(new ErrorHttpResponse(
Headers.HTTP_NOT_ACCEPTABLE,
"Could not parse " + Headers.VERSION
+ "header of request (values: " + washedClientVersions +
"). Server supports protocol versions "
+ serverSupportedVersions), -1);
}
return new Tuple2<>(null, version);
}
private static List<String> splitVersions(List<String> clientSupportedVersions) {
List<String> splittedVersions = new ArrayList<>();
for (String v : clientSupportedVersions) {
if (v == null || v.trim().isEmpty()) {
continue;
}
if (!v.contains(",")) {
splittedVersions.add(v.trim());
continue;
}
for (String part : v.split(",")) {
part = part.trim();
if (!part.isEmpty()) {
splittedVersions.add(part);
}
}
}
return splittedVersions;
}
@Override
public HttpResponse handle(HttpRequest request) {
Tuple2<HttpResponse, Integer> protocolVersion = checkProtocolVersion(request);
if (protocolVersion.first != null) {
return protocolVersion.first;
}
return feedHandlerV3.handle(request);
}
// Protected for testing
protected static InputStream unzipStreamIfNeeded(InputStream inputStream, HttpRequest httpRequest)
throws IOException {
String contentEncodingHeader = httpRequest.getHeader("content-encoding");
if ("gzip".equals(contentEncodingHeader)) {
return new GZIPInputStream(inputStream);
} else {
return inputStream;
}
}
@Override
protected void destroy() {
feedHandlerV3.destroy();
// We are forking this to avoid that accidental dereferrencing causes any random thread doing destruction.
// This caused a deadlock when the single Messenger thread in MessageBus was the last one referring this
// and started destructing something that required something only the messenger thread could provide.
Thread destroyer = new Thread(() -> {
internalDestroy();
});
destroyer.setDaemon(true);
destroyer.start();
}
private void internalDestroy() {
super.destroy();
}
}
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