/
NetClientImpl.java
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/
NetClientImpl.java
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/*
* Copyright (c) 2011-2017 Contributors to the Eclipse Foundation
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License 2.0 which is available at
* http://www.eclipse.org/legal/epl-2.0, or the Apache License, Version 2.0
* which is available at https://www.apache.org/licenses/LICENSE-2.0.
*
* SPDX-License-Identifier: EPL-2.0 OR Apache-2.0
*/
package io.vertx.core.net.impl;
import io.netty.bootstrap.Bootstrap;
import io.netty.channel.Channel;
import io.netty.channel.ChannelPipeline;
import io.netty.handler.logging.LoggingHandler;
import io.netty.handler.stream.ChunkedWriteHandler;
import io.netty.handler.timeout.IdleStateHandler;
import io.vertx.core.AsyncResult;
import io.vertx.core.Closeable;
import io.vertx.core.Future;
import io.vertx.core.Handler;
import io.vertx.core.impl.ContextInternal;
import io.vertx.core.impl.VertxInternal;
import io.vertx.core.logging.Logger;
import io.vertx.core.logging.LoggerFactory;
import io.vertx.core.net.NetClient;
import io.vertx.core.net.NetClientOptions;
import io.vertx.core.net.NetSocket;
import io.vertx.core.net.SocketAddress;
import io.vertx.core.spi.metrics.Metrics;
import io.vertx.core.spi.metrics.MetricsProvider;
import io.vertx.core.spi.metrics.TCPMetrics;
import io.vertx.core.spi.metrics.VertxMetrics;
import java.io.FileNotFoundException;
import java.net.ConnectException;
import java.util.Map;
import java.util.Objects;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.TimeUnit;
/**
*
* This class is thread-safe
*
* @author <a href="http://tfox.org">Tim Fox</a>
*/
public class NetClientImpl implements MetricsProvider, NetClient {
private static final Logger log = LoggerFactory.getLogger(NetClientImpl.class);
protected final int idleTimeout;
private final TimeUnit idleTimeoutUnit;
protected final boolean logEnabled;
private final VertxInternal vertx;
private final NetClientOptions options;
protected final SSLHelper sslHelper;
private final Map<Channel, NetSocketImpl> socketMap = new ConcurrentHashMap<>();
private final Closeable closeHook;
private final ContextInternal creatingContext;
private final TCPMetrics metrics;
private volatile boolean closed;
public NetClientImpl(VertxInternal vertx, NetClientOptions options) {
this(vertx, options, true);
}
public NetClientImpl(VertxInternal vertx, NetClientOptions options, boolean useCreatingContext) {
this.vertx = vertx;
this.options = new NetClientOptions(options);
this.sslHelper = new SSLHelper(options, options.getKeyCertOptions(), options.getTrustOptions());
this.closeHook = completionHandler -> {
NetClientImpl.this.close();
completionHandler.handle(Future.succeededFuture());
};
if (useCreatingContext) {
creatingContext = vertx.getContext();
if (creatingContext != null) {
if (creatingContext.isMultiThreadedWorkerContext()) {
throw new IllegalStateException("Cannot use NetClient in a multi-threaded worker verticle");
}
creatingContext.addCloseHook(closeHook);
}
} else {
creatingContext = null;
}
VertxMetrics metrics = vertx.metricsSPI();
this.metrics = metrics != null ? metrics.createNetClientMetrics(options) : null;
logEnabled = options.getLogActivity();
idleTimeout = options.getIdleTimeout();
idleTimeoutUnit = options.getIdleTimeoutUnit();
}
protected void initChannel(ChannelPipeline pipeline) {
if (logEnabled) {
pipeline.addLast("logging", new LoggingHandler());
}
if (sslHelper.isSSL()) {
// only add ChunkedWriteHandler when SSL is enabled otherwise it is not needed as FileRegion is used.
pipeline.addLast("chunkedWriter", new ChunkedWriteHandler()); // For large file / sendfile support
}
if (idleTimeout > 0) {
pipeline.addLast("idle", new IdleStateHandler(0, 0, idleTimeout, idleTimeoutUnit));
}
}
public synchronized NetClient connect(int port, String host, Handler<AsyncResult<NetSocket>> connectHandler) {
connect(port, host, null, connectHandler);
return this;
}
@Override
public NetClient connect(int port, String host, String serverName, Handler<AsyncResult<NetSocket>> connectHandler) {
doConnect(SocketAddress.inetSocketAddress(port, host), serverName, connectHandler != null ? ar -> connectHandler.handle(ar.map(s -> (NetSocket) s)) : null);
return this;
}
public void close() {
if (!closed) {
for (NetSocketImpl sock : socketMap.values()) {
sock.close();
}
if (creatingContext != null) {
creatingContext.removeCloseHook(closeHook);
}
closed = true;
if (metrics != null) {
metrics.close();
}
}
}
@Override
public boolean isMetricsEnabled() {
return metrics != null && metrics.isEnabled();
}
@Override
public Metrics getMetrics() {
return metrics;
}
private void checkClosed() {
if (closed) {
throw new IllegalStateException("Client is closed");
}
}
private void applyConnectionOptions(boolean domainSocket, Bootstrap bootstrap) {
vertx.transport().configure(options, domainSocket, bootstrap);
}
@Override
public NetClient connect(SocketAddress remoteAddress, String serverName, Handler<AsyncResult<NetSocket>> connectHandler) {
doConnect(remoteAddress, serverName, connectHandler);
return this;
}
@Override
public NetClient connect(SocketAddress remoteAddress, Handler<AsyncResult<NetSocket>> connectHandler) {
doConnect(remoteAddress, null, connectHandler);
return this;
}
protected void doConnect(SocketAddress remoteAddress, String serverName, Handler<AsyncResult<NetSocket>> connectHandler) {
doConnect(remoteAddress, serverName, connectHandler, options.getReconnectAttempts());
}
protected void doConnect(SocketAddress remoteAddress, String serverName, Handler<AsyncResult<NetSocket>> connectHandler,
int remainingAttempts) {
checkClosed();
Objects.requireNonNull(connectHandler, "No null connectHandler accepted");
ContextInternal context = vertx.getOrCreateContext();
sslHelper.validate(vertx);
Bootstrap bootstrap = new Bootstrap();
bootstrap.group(context.nettyEventLoop());
bootstrap.channelFactory(vertx.transport().channelFactory(remoteAddress.path() != null));
applyConnectionOptions(remoteAddress.path() != null, bootstrap);
ChannelProvider channelProvider = new ChannelProvider(bootstrap, sslHelper, sslHelper.isSSL(), context, options.getProxyOptions());
Handler<AsyncResult<Channel>> channelHandler = res -> {
if (res.succeeded()) {
Channel ch = res.result();
connected(context, ch, connectHandler, remoteAddress);
} else {
Throwable cause = res.cause();
// FileNotFoundException for domain sockets
boolean connectError = cause instanceof ConnectException || cause instanceof FileNotFoundException;
if (connectError && (remainingAttempts > 0 || remainingAttempts == -1)) {
context.executeFromIO(v -> {
log.debug("Failed to create connection. Will retry in " + options.getReconnectInterval() + " milliseconds");
//Set a timer to retry connection
vertx.setTimer(options.getReconnectInterval(), tid ->
doConnect(remoteAddress, serverName, connectHandler, remainingAttempts == -1 ? remainingAttempts : remainingAttempts - 1)
);
});
} else {
failed(context, null, cause, connectHandler);
}
}
};
channelProvider.connect(remoteAddress, remoteAddress, serverName, channelHandler);
}
private void connected(ContextInternal context, Channel ch, Handler<AsyncResult<NetSocket>> connectHandler, SocketAddress remoteAddress) {
initChannel(ch.pipeline());
VertxHandler<NetSocketImpl> handler = VertxHandler.create(context, ctx -> new NetSocketImpl(vertx, ctx, remoteAddress, context, sslHelper, metrics));
handler.addHandler(sock -> {
socketMap.put(ch, sock);
context.executeFromIO(v -> {
if (metrics != null) {
sock.metric(metrics.connected(sock.remoteAddress(), sock.remoteName()));
}
sock.registerEventBusHandler();
connectHandler.handle(Future.succeededFuture(sock));
});
});
handler.removeHandler(conn -> {
socketMap.remove(ch);
});
ch.pipeline().addLast("handler", handler);
}
private void failed(ContextInternal context, Channel ch, Throwable th, Handler<AsyncResult<NetSocket>> connectHandler) {
if (ch != null) {
ch.close();
}
context.executeFromIO(v -> doFailed(connectHandler, th));
}
private void doFailed(Handler<AsyncResult<NetSocket>> connectHandler, Throwable th) {
connectHandler.handle(Future.failedFuture(th));
}
@Override
protected void finalize() throws Throwable {
// Make sure this gets cleaned up if there are no more references to it
// so as not to leave connections and resources dangling until the system is shutdown
// which could make the JVM run out of file handles.
close();
super.finalize();
}
}