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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.prelude.fastsearch.test.fs4mock;
import com.yahoo.document.GlobalId;
import com.yahoo.fs4.BasicPacket;
import com.yahoo.fs4.BufferTooSmallException;
import com.yahoo.fs4.DocumentInfo;
import com.yahoo.fs4.EolPacket;
import com.yahoo.fs4.GetDocSumsPacket;
import com.yahoo.fs4.Packet;
import com.yahoo.fs4.PacketDecoder;
import com.yahoo.fs4.PingPacket;
import com.yahoo.fs4.PongPacket;
import com.yahoo.fs4.QueryPacket;
import com.yahoo.fs4.QueryResultPacket;
import com.yahoo.fs4.mplex.Backend;
import com.yahoo.fs4.mplex.FS4Channel;
import com.yahoo.prelude.fastsearch.test.DocsumDefinitionTestCase;
import java.nio.ByteBuffer;
import java.util.List;
/**
* A channel which returns hardcoded packets of the same type as fdispatch
*/
public class MockFSChannel extends FS4Channel {
/** The number of active documents this should report in ping reponses */
private final long activeDocuments;
public MockFSChannel() {
this(0);
}
public MockFSChannel(long activeDocuments) {
this.activeDocuments = activeDocuments;
}
private BasicPacket lastReceived = null;
private QueryPacket lastQueryPacket = null;
/** Initial value of docstamp */
private static int docstamp = 1088490666;
private static boolean emptyDocsums = false;
@Override
public synchronized boolean sendPacket(BasicPacket packet) {
try {
if (packet instanceof Packet)
packet.encode(ByteBuffer.allocate(65536), 0);
} catch (BufferTooSmallException e) {
throw new RuntimeException("Too small buffer to encode packet in mock backend.");
}
if (packet instanceof QueryPacket)
lastQueryPacket = (QueryPacket) packet;
lastReceived = packet;
return true;
}
/** Change docstamp to invalidate cache */
public static void resetDocstamp() {
docstamp = 1088490666;
}
/** Flip sending (in)valid docsums */
public static void setEmptyDocsums(boolean d) {
emptyDocsums = d;
}
/** Returns the last query packet received or null if none */
public QueryPacket getLastQueryPacket() {
return lastQueryPacket;
}
public BasicPacket getLastReceived() {
return lastReceived;
}
public BasicPacket[] receivePackets(long timeout, int packetCount) {
List<BasicPacket> packets = new java.util.ArrayList<>();
if (lastReceived instanceof QueryPacket) {
lastQueryPacket = (QueryPacket) lastReceived;
QueryResultPacket result = QueryResultPacket.create();
result.setDocstamp(docstamp);
result.setChannel(0);
result.setTotalDocumentCount(2);
result.setOffset(lastQueryPacket.getOffset());
if (lastQueryPacket.getOffset() == 0
&& lastQueryPacket.getLastOffset() >= 1) {
result.addDocument(
new DocumentInfo(DocsumDefinitionTestCase.createGlobalId(123),
2003, 234, 0));
}
if (lastQueryPacket.getOffset() <= 1
&& lastQueryPacket.getLastOffset() >= 2) {
result.addDocument(
new DocumentInfo(DocsumDefinitionTestCase.createGlobalId(456),
1855, 234, 1));
}
packets.add(result);
}
else if (lastReceived instanceof GetDocSumsPacket) {
addDocsums(packets, lastQueryPacket);
}
else if (lastReceived instanceof PingPacket) {
packets.add(new PongPacket(activeDocuments));
}
while (packetCount >= 0 && packets.size() > packetCount) {
packets.remove(packets.size() - 1);
}
return packets.toArray(new BasicPacket[packets.size()]);
}
/** Adds the number of docsums requested in queryPacket.getHits() */
private void addDocsums(List packets, QueryPacket queryPacket) {
int numHits = queryPacket.getHits();
if (lastReceived instanceof GetDocSumsPacket) {
numHits = ((GetDocSumsPacket) lastReceived).getNumDocsums();
}
for (int i = 0; i < numHits; i++) {
ByteBuffer buffer;
if (emptyDocsums) {
buffer = createEmptyDocsumPacketData();
} else {
int[] docids = {
123, 456, 789, 789, 789, 789, 789, 789, 789,
789, 789, 789 };
buffer = createDocsumPacketData(docids[i], DocsumDefinitionTestCase.makeDocsum());
}
buffer.position(0);
packets.add(PacketDecoder.decode(buffer));
}
packets.add(EolPacket.create());
}
private ByteBuffer createEmptyDocsumPacketData() {
ByteBuffer buffer = ByteBuffer.allocate(16);
buffer.limit(buffer.capacity());
buffer.position(0);
buffer.putInt(12); // length
buffer.putInt(205); // a code for docsumpacket
buffer.putInt(0); // channel
buffer.putInt(0); // dummy location
return buffer;
}
private ByteBuffer createDocsumPacketData(int docid, byte[] docsumData) {
ByteBuffer buffer = ByteBuffer.allocate(docsumData.length + 4 + 8 + GlobalId.LENGTH);
buffer.limit(buffer.capacity());
buffer.position(0);
buffer.putInt(docsumData.length + 8 + GlobalId.LENGTH);
buffer.putInt(205); // Docsum packet code
buffer.putInt(0);
byte[] rawGid = DocsumDefinitionTestCase.createGlobalId(docid).getRawId();
buffer.put(rawGid);
buffer.put(docsumData);
return buffer;
}
public void close() {}
}
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