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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.prelude.fastsearch;
import com.yahoo.fs4.BasicPacket;
import com.yahoo.fs4.ChannelTimeoutException;
import com.yahoo.fs4.Packet;
import com.yahoo.fs4.QueryPacket;
import com.yahoo.fs4.QueryResultPacket;
import com.yahoo.fs4.mplex.FS4Channel;
import com.yahoo.fs4.mplex.InvalidChannelException;
import com.yahoo.search.Query;
import com.yahoo.search.Result;
import com.yahoo.search.dispatch.ResponseMonitor;
import com.yahoo.search.dispatch.SearchInvoker;
import com.yahoo.search.dispatch.searchcluster.Node;
import com.yahoo.search.result.ErrorMessage;
import java.io.IOException;
import java.util.Arrays;
import java.util.List;
import java.util.Optional;
import java.util.logging.Level;
import java.util.logging.Logger;
import static java.util.Arrays.asList;
/**
* {@link SearchInvoker} implementation for FS4 nodes and fdispatch
*
* @author ollivir
*/
public class FS4SearchInvoker extends SearchInvoker implements ResponseMonitor<FS4Channel> {
private final VespaBackEndSearcher searcher;
private FS4Channel channel;
private ErrorMessage pendingSearchError = null;
private Query query = null;
private QueryPacket queryPacket = null;
public FS4SearchInvoker(VespaBackEndSearcher searcher, Query query, FS4Channel channel, Optional<Node> node) {
super(node);
this.searcher = searcher;
this.channel = channel;
channel.setQuery(query);
channel.setResponseMonitor(this);
}
@Override
protected void sendSearchRequest(Query query, QueryPacket queryPacket) throws IOException {
if (isLoggingFine())
getLogger().finest("sending query packet");
if(queryPacket == null) {
// query changed for subchannel
queryPacket = searcher.createQueryPacket(query);
}
this.query = query;
this.queryPacket = queryPacket;
channel.setResponseMonitor(this);
try {
boolean couldSend = channel.sendPacket(queryPacket);
if (!couldSend) {
pendingSearchError = ErrorMessage.createBackendCommunicationError("Could not reach '" + getName() + "'");
}
} catch (InvalidChannelException e) {
pendingSearchError = ErrorMessage.createBackendCommunicationError("Invalid channel " + getName());
} catch (IllegalStateException e) {
pendingSearchError = ErrorMessage.createBackendCommunicationError("Illegal state in FS4: " + e.getMessage());
}
}
@Override
protected List<Result> getSearchResults(CacheKey cacheKey) throws IOException {
if(pendingSearchError != null) {
return errorResult(pendingSearchError);
}
BasicPacket[] basicPackets;
try {
basicPackets = channel.receivePackets(query.getTimeLeft(), 1);
} catch (ChannelTimeoutException e) {
return errorResult(ErrorMessage.createTimeout("Timeout while waiting for " + getName()));
} catch (InvalidChannelException e) {
return errorResult(ErrorMessage.createBackendCommunicationError("Invalid channel for " + getName()));
}
if (basicPackets.length == 0) {
return errorResult(ErrorMessage.createBackendCommunicationError(getName() + " got no packets back"));
}
if (isLoggingFine())
getLogger().finest("got packets " + basicPackets.length + " packets");
basicPackets[0].ensureInstanceOf(QueryResultPacket.class, getName());
QueryResultPacket resultPacket = (QueryResultPacket) basicPackets[0];
if (isLoggingFine())
getLogger().finest("got query packet. " + "docsumClass=" + query.getPresentation().getSummary());
if (query.getPresentation().getSummary() == null)
query.getPresentation().setSummary(searcher.getDefaultDocsumClass());
Result result = new Result(query);
searcher.addMetaInfo(query, queryPacket.getQueryPacketData(), resultPacket, result);
searcher.addUnfilledHits(result, resultPacket.getDocuments(), false, queryPacket.getQueryPacketData(), cacheKey, distributionKey());
Packet[] packets;
CacheControl cacheControl = searcher.getCacheControl();
PacketWrapper packetWrapper = cacheControl.lookup(cacheKey, query);
if (packetWrapper != null) {
cacheControl.updateCacheEntry(cacheKey, query, resultPacket);
} else {
if (resultPacket.getCoverageFeature() && !resultPacket.getCoverageFull()) {
// Don't add error here, it was done in first phase
// No check if packetWrapper already exists, since incomplete
// first phase data won't be cached anyway.
} else {
packets = new Packet[1];
packets[0] = resultPacket;
cacheControl.cache(cacheKey, query, new DocsumPacketKey[0], packets, distributionKey());
}
}
return asList(result);
}
private List<Result> errorResult(ErrorMessage errorMessage) {
Result error = new Result(query, errorMessage);
getErrorCoverage().ifPresent(error::setCoverage);
return Arrays.asList(error);
}
@Override
public void release() {
if (channel != null) {
channel.close();
channel = null;
}
}
private String getName() {
return searcher.getName();
}
private Logger getLogger() {
return searcher.getLogger();
}
private boolean isLoggingFine() {
return getLogger().isLoggable(Level.FINE);
}
@Override
public void responseAvailable(FS4Channel from) {
responseAvailable();
}
}
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