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/*
* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch licenses this file to you under
* the Apache License, Version 2.0 (the "License"); you may
* not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.elasticsearch.discovery.zen;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.elasticsearch.cluster.ClusterState;
import org.elasticsearch.cluster.coordination.ValidateJoinRequest;
import org.elasticsearch.cluster.node.DiscoveryNode;
import org.elasticsearch.common.io.stream.StreamInput;
import org.elasticsearch.common.io.stream.StreamOutput;
import org.elasticsearch.common.unit.TimeValue;
import org.elasticsearch.tasks.Task;
import org.elasticsearch.threadpool.ThreadPool;
import org.elasticsearch.transport.EmptyTransportResponseHandler;
import org.elasticsearch.transport.TransportChannel;
import org.elasticsearch.transport.TransportRequest;
import org.elasticsearch.transport.TransportRequestHandler;
import org.elasticsearch.transport.TransportResponse;
import org.elasticsearch.transport.TransportService;
import java.io.IOException;
import java.util.Collection;
import java.util.concurrent.TimeUnit;
import java.util.function.BiConsumer;
import java.util.function.Supplier;
public class MembershipAction {
private static final Logger logger = LogManager.getLogger(MembershipAction.class);
public static final String DISCOVERY_JOIN_ACTION_NAME = "internal:discovery/zen/join";
public static final String DISCOVERY_JOIN_VALIDATE_ACTION_NAME = "internal:discovery/zen/join/validate";
public static final String DISCOVERY_LEAVE_ACTION_NAME = "internal:discovery/zen/leave";
public interface JoinCallback {
void onSuccess();
void onFailure(Exception e);
}
public interface MembershipListener {
void onJoin(DiscoveryNode node, JoinCallback callback);
void onLeave(DiscoveryNode node);
}
private final TransportService transportService;
private final MembershipListener listener;
public MembershipAction(TransportService transportService, MembershipListener listener,
Collection> joinValidators) {
this.transportService = transportService;
this.listener = listener;
transportService.registerRequestHandler(DISCOVERY_JOIN_ACTION_NAME,
ThreadPool.Names.GENERIC, JoinRequest::new, new JoinRequestRequestHandler());
transportService.registerRequestHandler(DISCOVERY_JOIN_VALIDATE_ACTION_NAME,
ThreadPool.Names.GENERIC, ValidateJoinRequest::new,
new ValidateJoinRequestRequestHandler(transportService::getLocalNode, joinValidators));
transportService.registerRequestHandler(DISCOVERY_LEAVE_ACTION_NAME,
ThreadPool.Names.GENERIC, LeaveRequest::new, new LeaveRequestRequestHandler());
}
public void sendLeaveRequest(DiscoveryNode masterNode, DiscoveryNode node) {
transportService.sendRequest(node, DISCOVERY_LEAVE_ACTION_NAME, new LeaveRequest(masterNode),
EmptyTransportResponseHandler.INSTANCE_SAME);
}
public void sendLeaveRequestBlocking(DiscoveryNode masterNode, DiscoveryNode node, TimeValue timeout) {
transportService.submitRequest(masterNode, DISCOVERY_LEAVE_ACTION_NAME, new LeaveRequest(node),
EmptyTransportResponseHandler.INSTANCE_SAME).txGet(timeout.millis(), TimeUnit.MILLISECONDS);
}
public void sendJoinRequestBlocking(DiscoveryNode masterNode, DiscoveryNode node, TimeValue timeout) {
transportService.submitRequest(masterNode, DISCOVERY_JOIN_ACTION_NAME, new JoinRequest(node),
EmptyTransportResponseHandler.INSTANCE_SAME).txGet(timeout.millis(), TimeUnit.MILLISECONDS);
}
/**
* Validates the join request, throwing a failure if it failed.
*/
public void sendValidateJoinRequestBlocking(DiscoveryNode node, ClusterState state, TimeValue timeout) {
transportService.submitRequest(node, DISCOVERY_JOIN_VALIDATE_ACTION_NAME, new ValidateJoinRequest(state),
EmptyTransportResponseHandler.INSTANCE_SAME).txGet(timeout.millis(), TimeUnit.MILLISECONDS);
}
public static class JoinRequest extends TransportRequest {
private DiscoveryNode node;
public DiscoveryNode getNode() {
return node;
}
public JoinRequest(StreamInput in) throws IOException {
super(in);
node = new DiscoveryNode(in);
}
public JoinRequest(DiscoveryNode node) {
this.node = node;
}
@Override
public void writeTo(StreamOutput out) throws IOException {
super.writeTo(out);
node.writeTo(out);
}
}
private class JoinRequestRequestHandler implements TransportRequestHandler {
@Override
public void messageReceived(final JoinRequest request, final TransportChannel channel, Task task) throws Exception {
listener.onJoin(request.getNode(), new JoinCallback() {
@Override
public void onSuccess() {
try {
channel.sendResponse(TransportResponse.Empty.INSTANCE);
} catch (Exception e) {
onFailure(e);
}
}
@Override
public void onFailure(Exception e) {
try {
channel.sendResponse(e);
} catch (Exception inner) {
inner.addSuppressed(e);
logger.warn("failed to send back failure on join request", inner);
}
}
});
}
}
static class ValidateJoinRequestRequestHandler implements TransportRequestHandler {
private final Supplier localNodeSupplier;
private final Collection> joinValidators;
ValidateJoinRequestRequestHandler(Supplier localNodeSupplier,
Collection> joinValidators) {
this.localNodeSupplier = localNodeSupplier;
this.joinValidators = joinValidators;
}
@Override
public void messageReceived(ValidateJoinRequest request, TransportChannel channel, Task task) throws Exception {
DiscoveryNode node = localNodeSupplier.get();
assert node != null : "local node is null";
joinValidators.stream().forEach(action -> action.accept(node, request.getState()));
channel.sendResponse(TransportResponse.Empty.INSTANCE);
}
}
public static class LeaveRequest extends TransportRequest {
private DiscoveryNode node;
public LeaveRequest(StreamInput in) throws IOException {
super(in);
node = new DiscoveryNode(in);
}
private LeaveRequest(DiscoveryNode node) {
this.node = node;
}
@Override
public void writeTo(StreamOutput out) throws IOException {
super.writeTo(out);
node.writeTo(out);
}
}
private class LeaveRequestRequestHandler implements TransportRequestHandler {
@Override
public void messageReceived(LeaveRequest request, TransportChannel channel, Task task) throws Exception {
listener.onLeave(request.node);
channel.sendResponse(TransportResponse.Empty.INSTANCE);
}
}
}