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// Copyright Vespa.ai. 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.container.handler.threadpool.ContainerThreadPool;
import com.yahoo.container.jdisc.HttpRequest;
import com.yahoo.container.jdisc.HttpResponse;
import com.yahoo.container.jdisc.ThreadedHttpRequestHandler;
import com.yahoo.container.jdisc.messagebus.SessionCache;
import com.yahoo.document.DocumentTypeManager;
import com.yahoo.documentapi.metrics.DocumentApiMetrics;
import com.yahoo.jdisc.Metric;
import com.yahoo.jdisc.Request;
import com.yahoo.jdisc.Response;
import com.yahoo.jdisc.handler.ResponseHandler;
import com.yahoo.messagebus.ReplyHandler;
import com.yahoo.metrics.simple.MetricReceiver;
import javax.inject.Inject;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import java.util.Optional;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import java.util.zip.GZIPInputStream;
/**
* Accept feeds from outside the Vespa cluster.
*
* @author Steinar Knutsen
*/
public class FeedHandler extends ThreadedHttpRequestHandler {
protected final ReplyHandler feedReplyHandler;
private static final List<Integer> serverSupportedVersions = List.of(3);
private static final Pattern USER_AGENT_PATTERN = Pattern.compile("vespa-http-client \\((.+)\\)");
private final FeedHandlerV3 feedHandlerV3;
private final DocumentApiMetrics metricsHelper;
@Inject
public FeedHandler(ContainerThreadPool threadpool,
Metric metric,
DocumentTypeManager documentTypeManager,
SessionCache sessionCache,
MetricReceiver metricReceiver) {
super(threadpool.executor(), metric);
metricsHelper = new DocumentApiMetrics(metricReceiver, "vespa.http.server");
feedHandlerV3 = new FeedHandlerV3(threadpool.executor(), metric, documentTypeManager, sessionCache, metricsHelper);
feedReplyHandler = new FeedReplyReader(metric, 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) {
metricsHelper.reportHttpRequest(findClientVersion(request).orElse(null));
Tuple2<HttpResponse, Integer> protocolVersion = checkProtocolVersion(request);
if (protocolVersion.first != null) {
return protocolVersion.first;
}
return feedHandlerV3.handle(request);
}
@Override
protected void writeErrorResponseOnOverload(Request request, ResponseHandler responseHandler) {
int responseCode = request.headers().getFirst(Headers.SILENTUPGRADE) != null ? 299 : 429;
responseHandler.handleResponse(new Response(responseCode)).close(null);
}
private static Optional<String> findClientVersion(HttpRequest request) {
String versionHeader = request.getHeader(Headers.CLIENT_VERSION);
if (versionHeader != null) {
return Optional.of(versionHeader);
}
return Optional.ofNullable(request.getHeader("User-Agent"))
.map(USER_AGENT_PATTERN::matcher)
.filter(Matcher::matches)
.map(matcher -> matcher.group(1));
}
// 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(); }
}
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