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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.data.access.simple.Value;
import com.yahoo.data.access.slime.SlimeAdapter;
import com.yahoo.fs4.BasicPacket;
import com.yahoo.fs4.ChannelTimeoutException;
import com.yahoo.fs4.DocumentInfo;
import com.yahoo.fs4.FS4Properties;
import com.yahoo.fs4.QueryPacket;
import com.yahoo.fs4.QueryPacketData;
import com.yahoo.fs4.QueryResultPacket;
import com.yahoo.fs4.mplex.FS4Channel;
import com.yahoo.fs4.mplex.InvalidChannelException;
import com.yahoo.io.GrowableByteBuffer;
import com.yahoo.log.LogLevel;
import com.yahoo.prelude.ConfigurationException;
import com.yahoo.processing.request.CompoundName;
import com.yahoo.search.Query;
import com.yahoo.search.Result;
import com.yahoo.search.dispatch.InvokerResult;
import com.yahoo.search.dispatch.LeanHit;
import com.yahoo.search.dispatch.ResponseMonitor;
import com.yahoo.search.dispatch.SearchInvoker;
import com.yahoo.search.dispatch.searchcluster.Node;
import com.yahoo.search.query.Sorting;
import com.yahoo.search.result.Coverage;
import com.yahoo.search.result.ErrorMessage;
import com.yahoo.search.result.Relevance;
import com.yahoo.search.searchchain.Execution;
import com.yahoo.searchlib.aggregation.Grouping;
import com.yahoo.slime.BinaryFormat;
import com.yahoo.vespa.objects.BufferSerializer;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.util.ArrayList;
import java.util.List;
import java.util.Optional;
import java.util.logging.Logger;
/**
* {@link SearchInvoker} implementation for FS4 nodes and fdispatch
*
* @author ollivir
*/
public class FS4SearchInvoker extends SearchInvoker implements ResponseMonitor<FS4Channel> {
static final CompoundName PACKET_COMPRESSION_LIMIT = new CompoundName("packetcompressionlimit");
static final CompoundName PACKET_COMPRESSION_TYPE = new CompoundName("packetcompressiontype");
private static final Logger log = Logger.getLogger(FS4SearchInvoker.class.getName());
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) throws IOException {
log.finest("sending query packet");
this.query = query;
createQueryPacket(searcher.getServerId(), query);
try {
boolean couldSend = channel.sendPacket(queryPacket);
if (!couldSend) {
setPendingError("Could not reach '" + getName() + "'");
}
} catch (InvalidChannelException e) {
setPendingError("Invalid channel " + getName());
} catch (IllegalStateException e) {
setPendingError("Illegal state in FS4: " + e.getMessage());
}
}
private void setPendingError(String message) {
pendingSearchError = ErrorMessage.createBackendCommunicationError(message);
responseAvailable();
}
@Override
protected InvokerResult getSearchResult(Execution execution) throws IOException {
if (pendingSearchError != null) {
return errorResult(query, pendingSearchError);
}
BasicPacket[] basicPackets;
try {
basicPackets = channel.receivePackets(query.getTimeLeft(), 1);
} catch (ChannelTimeoutException e) {
return errorResult(query, ErrorMessage.createTimeout("Timeout while waiting for " + getName()));
} catch (InvalidChannelException e) {
return errorResult(query, ErrorMessage.createBackendCommunicationError("Invalid channel for " + getName()));
}
if (basicPackets.length == 0) {
return errorResult(query, ErrorMessage.createBackendCommunicationError(getName() + " got no packets back"));
}
log.finest(() -> "got packets " + basicPackets.length + " packets");
basicPackets[0].ensureInstanceOf(QueryResultPacket.class, getName());
QueryResultPacket resultPacket = (QueryResultPacket) basicPackets[0];
log.finest(() -> "got query packet. " + "docsumClass=" + query.getPresentation().getSummary());
if (query.getPresentation().getSummary() == null)
query.getPresentation().setSummary(searcher.getDefaultDocsumClass());
InvokerResult result = new InvokerResult(query, resultPacket.getDocumentCount());
addMetaInfo(query, queryPacket.getQueryPacketData(), resultPacket, result.getResult());
addUnfilledHits(result.getLeanHits(), resultPacket.getDocuments(), queryPacket.getQueryPacketData());
return result;
}
private QueryPacket createQueryPacket(String serverId, Query query) {
this.queryPacket = QueryPacket.create(serverId, query);
int compressionLimit = query.properties().getInteger(PACKET_COMPRESSION_LIMIT, 0);
queryPacket.setCompressionLimit(compressionLimit);
if (compressionLimit != 0) {
queryPacket.setCompressionType(query.properties().getString(PACKET_COMPRESSION_TYPE, "lz4"));
}
log.fine(() -> "made QueryPacket: " + queryPacket);
return queryPacket;
}
private void addMetaInfo(Query query, QueryPacketData queryPacketData, QueryResultPacket resultPacket, Result result) {
result.setTotalHitCount(resultPacket.getTotalDocumentCount());
addBackendTrace(query, resultPacket);
// Grouping
if (resultPacket.getGroupData() != null) {
byte[] data = resultPacket.getGroupData();
ArrayList<Grouping> list = new ArrayList<>();
BufferSerializer buf = new BufferSerializer(new GrowableByteBuffer(ByteBuffer.wrap(data)));
int cnt = buf.getInt(null);
for (int i = 0; i < cnt; i++) {
Grouping g = new Grouping();
g.deserialize(buf);
list.add(g);
}
GroupingListHit hit = new GroupingListHit(list, searcher.getDocsumDefinitionSet(query));
hit.setQuery(result.getQuery());
hit.setSource(getName());
hit.setQueryPacketData(queryPacketData);
result.hits().add(hit);
}
if (resultPacket.getCoverageFeature()) {
result.setCoverage(new Coverage(resultPacket.getCoverageDocs(), resultPacket.getActiveDocs(), resultPacket.getNodesReplied())
.setSoonActive(resultPacket.getSoonActiveDocs())
.setDegradedReason(resultPacket.getDegradedReason())
.setNodesTried(resultPacket.getNodesQueried()));
}
}
private void addBackendTrace(Query query, QueryResultPacket resultPacket) {
if (resultPacket.propsArray == null) return;
Value.ArrayValue traces = new Value.ArrayValue();
for (FS4Properties properties : resultPacket.propsArray) {
if ( ! properties.getName().equals("trace")) continue;
for (FS4Properties.Entry entry : properties.getEntries()) {
traces.add(new SlimeAdapter(BinaryFormat.decode(entry.getValue()).get()));
}
}
query.trace(traces, query.getTraceLevel());
}
/**
* Creates unfilled hits from a List of DocumentInfo instances.
*/
private void addUnfilledHits(List<LeanHit> result, List<DocumentInfo> documents, QueryPacketData queryPacketData) {
Optional<Integer> channelDistributionKey = distributionKey();
for (DocumentInfo document : documents) {
byte [] sortData = document.getSortData();
LeanHit hit = (sortData == null)
? new LeanHit(document.getRawGlobalId(), document.getPartId(), channelDistributionKey.orElse(document.getDistributionKey()), document.getMetric())
: new LeanHit(document.getRawGlobalId(), document.getPartId(), channelDistributionKey.orElse(document.getDistributionKey()), document.getSortData());
if (queryPacketData != null) {
hit.setQueryPacketData(queryPacketData);
}
result.add(hit);
}
}
@Override
public void release() {
if (channel != null) {
channel.close();
channel = null;
}
}
private String getName() {
return searcher.getName();
}
@Override
public void responseAvailable(FS4Channel from) {
responseAvailable();
}
}
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