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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.transport.local;
import org.elasticsearch.ElasticsearchException;
import org.elasticsearch.Version;
import org.elasticsearch.cluster.node.DiscoveryNode;
import org.elasticsearch.common.Nullable;
import org.elasticsearch.common.breaker.CircuitBreaker;
import org.elasticsearch.common.component.AbstractLifecycleComponent;
import org.elasticsearch.common.component.Lifecycle;
import org.elasticsearch.common.inject.Inject;
import org.elasticsearch.common.io.stream.BytesStreamOutput;
import org.elasticsearch.common.io.stream.NamedWriteableAwareStreamInput;
import org.elasticsearch.common.io.stream.NamedWriteableRegistry;
import org.elasticsearch.common.io.stream.StreamInput;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.common.transport.BoundTransportAddress;
import org.elasticsearch.common.transport.LocalTransportAddress;
import org.elasticsearch.common.transport.TransportAddress;
import org.elasticsearch.common.util.concurrent.AbstractRunnable;
import org.elasticsearch.common.util.concurrent.EsExecutors;
import org.elasticsearch.indices.breaker.CircuitBreakerService;
import org.elasticsearch.threadpool.ThreadPool;
import org.elasticsearch.transport.*;
import org.elasticsearch.transport.support.TransportStatus;
import java.io.IOException;
import java.util.*;
import java.util.concurrent.ConcurrentMap;
import java.util.concurrent.ThreadFactory;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicLong;
import static org.elasticsearch.common.util.concurrent.ConcurrentCollections.newConcurrentMap;
/**
*
*/
public class LocalTransport extends AbstractLifecycleComponent implements Transport {
public static final String LOCAL_TRANSPORT_THREAD_NAME_PREFIX = "local_transport";
private final ThreadPool threadPool;
private final ThreadPoolExecutor workers;
private final Version version;
private volatile TransportServiceAdapter transportServiceAdapter;
private volatile BoundTransportAddress boundAddress;
private volatile LocalTransportAddress localAddress;
private final static ConcurrentMap transports = newConcurrentMap();
private static final AtomicLong transportAddressIdGenerator = new AtomicLong();
private final ConcurrentMap connectedNodes = newConcurrentMap();
private final NamedWriteableRegistry namedWriteableRegistry;
private final CircuitBreakerService circuitBreakerService;
public static final String TRANSPORT_LOCAL_ADDRESS = "transport.local.address";
public static final String TRANSPORT_LOCAL_WORKERS = "transport.local.workers";
public static final String TRANSPORT_LOCAL_QUEUE = "transport.local.queue";
@Inject
public LocalTransport(Settings settings, ThreadPool threadPool, Version version,
NamedWriteableRegistry namedWriteableRegistry, CircuitBreakerService circuitBreakerService) {
super(settings);
this.threadPool = threadPool;
this.version = version;
int workerCount = this.settings.getAsInt(TRANSPORT_LOCAL_WORKERS, EsExecutors.boundedNumberOfProcessors(settings));
int queueSize = this.settings.getAsInt(TRANSPORT_LOCAL_QUEUE, -1);
logger.debug("creating [{}] workers, queue_size [{}]", workerCount, queueSize);
final ThreadFactory threadFactory = EsExecutors.daemonThreadFactory(this.settings, LOCAL_TRANSPORT_THREAD_NAME_PREFIX);
this.workers = EsExecutors.newFixed(LOCAL_TRANSPORT_THREAD_NAME_PREFIX, workerCount, queueSize, threadFactory);
this.namedWriteableRegistry = namedWriteableRegistry;
this.circuitBreakerService = circuitBreakerService;
}
@Override
public TransportAddress[] addressesFromString(String address, int perAddressLimit) {
return new TransportAddress[]{new LocalTransportAddress(address)};
}
@Override
public boolean addressSupported(Class address) {
return LocalTransportAddress.class.equals(address);
}
@Override
protected void doStart() {
String address = settings.get(TRANSPORT_LOCAL_ADDRESS);
if (address == null) {
address = Long.toString(transportAddressIdGenerator.incrementAndGet());
}
localAddress = new LocalTransportAddress(address);
LocalTransport previous = transports.put(localAddress, this);
if (previous != null) {
throw new ElasticsearchException("local address [" + address + "] is already bound");
}
boundAddress = new BoundTransportAddress(new TransportAddress[] { localAddress }, localAddress);
}
@Override
protected void doStop() {
transports.remove(localAddress);
// now, go over all the transports connected to me, and raise disconnected event
for (final LocalTransport targetTransport : transports.values()) {
for (final Map.Entry entry : targetTransport.connectedNodes.entrySet()) {
if (entry.getValue() == this) {
targetTransport.disconnectFromNode(entry.getKey());
}
}
}
}
@Override
protected void doClose() {
ThreadPool.terminate(workers, 10, TimeUnit.SECONDS);
}
@Override
public void transportServiceAdapter(TransportServiceAdapter transportServiceAdapter) {
this.transportServiceAdapter = transportServiceAdapter;
}
@Override
public BoundTransportAddress boundAddress() {
return boundAddress;
}
@Override
public Map profileBoundAddresses() {
return Collections.EMPTY_MAP;
}
@Override
public boolean nodeConnected(DiscoveryNode node) {
return connectedNodes.containsKey(node);
}
@Override
public void connectToNodeLight(DiscoveryNode node) throws ConnectTransportException {
connectToNode(node);
}
@Override
public void connectToNode(DiscoveryNode node) throws ConnectTransportException {
synchronized (this) {
if (connectedNodes.containsKey(node)) {
return;
}
final LocalTransport targetTransport = transports.get(node.address());
if (targetTransport == null) {
throw new ConnectTransportException(node, "Failed to connect");
}
connectedNodes.put(node, targetTransport);
transportServiceAdapter.raiseNodeConnected(node);
}
}
@Override
public void disconnectFromNode(DiscoveryNode node) {
synchronized (this) {
LocalTransport removed = connectedNodes.remove(node);
if (removed != null) {
transportServiceAdapter.raiseNodeDisconnected(node);
}
}
}
@Override
public long serverOpen() {
return 0;
}
@Override
public void sendRequest(final DiscoveryNode node, final long requestId, final String action, final TransportRequest request, TransportRequestOptions options) throws IOException, TransportException {
final Version version = Version.smallest(node.version(), this.version);
try (BytesStreamOutput stream = new BytesStreamOutput()) {
stream.setVersion(version);
stream.writeLong(requestId);
byte status = 0;
status = TransportStatus.setRequest(status);
stream.writeByte(status); // 0 for request, 1 for response.
stream.writeString(action);
request.writeTo(stream);
stream.close();
final LocalTransport targetTransport = connectedNodes.get(node);
if (targetTransport == null) {
throw new NodeNotConnectedException(node, "Node not connected");
}
final byte[] data = stream.bytes().toBytes();
transportServiceAdapter.sent(data.length);
transportServiceAdapter.onRequestSent(node, requestId, action, request, options);
targetTransport.workers().execute(new Runnable() {
@Override
public void run() {
targetTransport.messageReceived(data, action, LocalTransport.this, version, requestId);
}
});
}
}
ThreadPoolExecutor workers() {
return this.workers;
}
CircuitBreaker inFlightRequestsBreaker() {
// We always obtain a fresh breaker to reflect changes to the breaker configuration.
return circuitBreakerService.getBreaker(CircuitBreaker.IN_FLIGHT_REQUESTS);
}
protected void messageReceived(byte[] data, String action, final LocalTransport sourceTransport, Version version,
@Nullable final Long sendRequestId) {
Transports.assertTransportThread();
try {
transportServiceAdapter.received(data.length);
StreamInput stream = StreamInput.wrap(data);
stream.setVersion(version);
long requestId = stream.readLong();
byte status = stream.readByte();
boolean isRequest = TransportStatus.isRequest(status);
if (isRequest) {
handleRequest(stream, requestId, data.length, sourceTransport, version);
} else {
final TransportResponseHandler handler = transportServiceAdapter.onResponseReceived(requestId);
// ignore if its null, the adapter logs it
if (handler != null) {
if (TransportStatus.isError(status)) {
handleResponseError(stream, handler);
} else {
handleResponse(stream, sourceTransport, handler);
}
}
}
} catch (Throwable e) {
if (sendRequestId != null) {
final TransportResponseHandler handler = sourceTransport.transportServiceAdapter.onResponseReceived(sendRequestId);
if (handler != null) {
final RemoteTransportException error = new RemoteTransportException(nodeName(), localAddress, action, e);
sourceTransport.workers().execute(new Runnable() {
@Override
public void run() {
sourceTransport.handleException(handler, error);
}
});
}
} else {
logger.warn("Failed to receive message for action [" + action + "]", e);
}
}
}
private void handleRequest(StreamInput stream, long requestId, int messageLengthBytes, LocalTransport sourceTransport,
Version version) throws Exception {
stream = new NamedWriteableAwareStreamInput(stream, namedWriteableRegistry);
final String action = stream.readString();
final RequestHandlerRegistry reg = transportServiceAdapter.getRequestHandler(action);
transportServiceAdapter.onRequestReceived(requestId, action);
if (reg != null && reg.canTripCircuitBreaker()) {
inFlightRequestsBreaker().addEstimateBytesAndMaybeBreak(messageLengthBytes, "");
} else {
inFlightRequestsBreaker().addWithoutBreaking(messageLengthBytes);
}
final LocalTransportChannel transportChannel = new LocalTransportChannel(this, transportServiceAdapter, sourceTransport, action,
requestId, version, messageLengthBytes);
try {
if (reg == null) {
throw new ActionNotFoundTransportException("Action [" + action + "] not found");
}
final TransportRequest request = reg.newRequest();
request.remoteAddress(sourceTransport.boundAddress.publishAddress());
request.readFrom(stream);
if (ThreadPool.Names.SAME.equals(reg.getExecutor())) {
//noinspection unchecked
reg.processMessageReceived(request, transportChannel);
} else {
threadPool.executor(reg.getExecutor()).execute(new AbstractRunnable() {
@Override
protected void doRun() throws Exception {
//noinspection unchecked
reg.processMessageReceived(request, transportChannel);
}
@Override
public boolean isForceExecution() {
return reg.isForceExecution();
}
@Override
public void onFailure(Throwable e) {
if (lifecycleState() == Lifecycle.State.STARTED) {
// we can only send a response transport is started....
try {
transportChannel.sendResponse(e);
} catch (Throwable e1) {
logger.warn("Failed to send error message back to client for action [" + action + "]", e1);
logger.warn("Actual Exception", e);
}
}
}
});
}
} catch (Throwable e) {
try {
transportChannel.sendResponse(e);
} catch (Throwable e1) {
logger.warn("Failed to send error message back to client for action [" + action + "]", e);
logger.warn("Actual Exception", e1);
}
}
}
protected void handleResponse(StreamInput buffer, LocalTransport sourceTransport, final TransportResponseHandler handler) {
buffer = new NamedWriteableAwareStreamInput(buffer, namedWriteableRegistry);
final TransportResponse response = handler.newInstance();
response.remoteAddress(sourceTransport.boundAddress.publishAddress());
try {
response.readFrom(buffer);
} catch (Throwable e) {
handleException(handler, new TransportSerializationException("Failed to deserialize response of type [" + response.getClass().getName() + "]", e));
return;
}
handleParsedResponse(response, handler);
}
protected void handleParsedResponse(final TransportResponse response, final TransportResponseHandler handler) {
threadPool.executor(handler.executor()).execute(new Runnable() {
@SuppressWarnings({"unchecked"})
@Override
public void run() {
try {
handler.handleResponse(response);
} catch (Throwable e) {
handleException(handler, new ResponseHandlerFailureTransportException(e));
}
}
});
}
private void handleResponseError(StreamInput buffer, final TransportResponseHandler handler) {
Throwable error;
try {
error = buffer.readThrowable();
} catch (Throwable e) {
error = new TransportSerializationException("Failed to deserialize exception response from stream", e);
}
handleException(handler, error);
}
private void handleException(final TransportResponseHandler handler, Throwable error) {
if (!(error instanceof RemoteTransportException)) {
error = new RemoteTransportException("None remote transport exception", null, null, error);
}
final RemoteTransportException rtx = (RemoteTransportException) error;
try {
handler.handleException(rtx);
} catch (Throwable t) {
logger.error("failed to handle exception response [{}]", t, handler);
}
}
@Override
public List getLocalAddresses() {
return Collections.singletonList("0.0.0.0");
}
}