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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.search.dispatch.rpc;
import ai.vespa.searchlib.searchprotocol.protobuf.SearchProtocol;
import com.google.protobuf.InvalidProtocolBufferException;
import com.yahoo.compress.CompressionType;
import com.yahoo.compress.Compressor;
import com.yahoo.prelude.Pong;
import com.yahoo.search.cluster.ClusterMonitor;
import com.yahoo.search.dispatch.rpc.Client.ProtobufResponse;
import com.yahoo.search.dispatch.rpc.Client.ResponseOrError;
import com.yahoo.search.dispatch.searchcluster.Node;
import com.yahoo.search.dispatch.searchcluster.Pinger;
import com.yahoo.search.dispatch.searchcluster.PongHandler;
import com.yahoo.search.result.ErrorMessage;
import com.yahoo.yolean.Exceptions;
import java.util.logging.Logger;
public class RpcPing implements Pinger, Client.ResponseReceiver {
private static final Logger log = Logger.getLogger(RpcPing.class.getName());
private static final String RPC_METHOD = "vespa.searchprotocol.ping";
private static final CompressionType PING_COMPRESSION = CompressionType.NONE;
private static final boolean triggeredClassLoading = ErrorMessage.createBackendCommunicationError("TriggerClassLoading") instanceof ErrorMessage;
private final Node node;
private final RpcConnectionPool connectionPool;
private final ClusterMonitor<Node> clusterMonitor;
private final long pingSequenceId;
private final PongHandler pongHandler;
private final Compressor compressor;
public RpcPing(Node node, ClusterMonitor<Node> clusterMonitor, RpcConnectionPool connectionPool, PongHandler pongHandler, Compressor compressor) {
this.node = node;
this.connectionPool = connectionPool;
this.clusterMonitor = clusterMonitor;
this.pingSequenceId = node.createPingSequenceId();
this.pongHandler = pongHandler;
this.compressor = compressor;
}
@Override
public void ping() {
try {
sendPing();
} catch (RuntimeException e) {
pongHandler.handle(new Pong(ErrorMessage.createBackendCommunicationError("Exception when pinging " + node +
": " + Exceptions.toMessageString(e))));
}
}
private Pong toPong(ResponseOrError<ProtobufResponse> responseOrError) {
if (responseOrError == null) {
return new Pong(ErrorMessage.createNoAnswerWhenPingingNode("Timed out waiting for pong from " + node));
} else if (responseOrError.error().isPresent()) {
return new Pong(ErrorMessage.createBackendCommunicationError(responseOrError.error().get()));
}
try {
return decodeReply(responseOrError.response().get());
} catch (InvalidProtocolBufferException e) {
return new Pong(ErrorMessage.createBackendCommunicationError(e.getMessage()));
}
}
private void sendPing() {
var connection = connectionPool.getConnection(node.key());
var ping = SearchProtocol.MonitorRequest.newBuilder().build().toByteArray();
double timeoutSeconds = ((double) clusterMonitor.getConfiguration().getRequestTimeout()) / 1000.0;
Compressor.Compression compressionResult = compressor.compress(PING_COMPRESSION, ping);
connection.request(RPC_METHOD, compressionResult.type(), ping.length, compressionResult.data(), this, timeoutSeconds);
}
private Pong decodeReply(ProtobufResponse response) throws InvalidProtocolBufferException {
CompressionType compression = CompressionType.valueOf(response.compression());
byte[] responseBytes = compressor.decompress(response.compressedPayload(), compression, response.uncompressedSize());
var reply = SearchProtocol.MonitorReply.parseFrom(responseBytes);
if (reply.getDistributionKey() != node.key()) {
return new Pong(ErrorMessage.createBackendCommunicationError("Expected pong from node id " + node.key() +
", response is from id " + reply.getDistributionKey()));
} else if (!reply.getOnline()) {
return new Pong(ErrorMessage.createBackendCommunicationError("Node id " + node.key() + " reports being offline"));
} else {
return new Pong(reply.getActiveDocs(), reply.getTargetActiveDocs(), reply.getIsBlockingWrites());
}
}
@Override
public void receive(ResponseOrError<ProtobufResponse> response) {
if (clusterMonitor.isClosed() && ! triggeredClassLoading) return;
if (node.isLastReceivedPong(pingSequenceId)) {
pongHandler.handle(toPong(response));
} else {
// TODO: Reduce to debug or remove once we have enumerated what happens here.
log.info("Pong " + pingSequenceId + " from node " + node.key() + " in group " + node.group() +
" with hostname " + node.hostname() + " received too late, latest is " + node.getLastReceivedPongId());
}
}
}
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