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The RabbitMQ Java client library allows Java applications to interface with RabbitMQ.
// Copyright (c) 2007-2023 VMware, Inc. or its affiliates. All rights reserved.
//
// This software, the RabbitMQ Java client library, is triple-licensed under the
// Mozilla Public License 2.0 ("MPL"), the GNU General Public License version 2
// ("GPL") and the Apache License version 2 ("ASL"). For the MPL, please see
// LICENSE-MPL-RabbitMQ. For the GPL, please see LICENSE-GPL2. For the ASL,
// please see LICENSE-APACHE2.
//
// This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND,
// either express or implied. See the LICENSE file for specific language governing
// rights and limitations of this software.
//
// If you have any questions regarding licensing, please contact us at
// [email protected].
package com.rabbitmq.client.impl;
import com.rabbitmq.client.AMQP;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import javax.net.ssl.SSLHandshakeException;
import javax.net.ssl.SSLSocket;
import java.io.*;
import java.net.InetAddress;
import java.net.Socket;
import java.net.SocketException;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Future;
import java.util.concurrent.TimeUnit;
/**
* A socket-based frame handler.
*/
public class SocketFrameHandler implements FrameHandler {
private static final Logger LOGGER = LoggerFactory.getLogger(SocketFrameHandler.class);
/** The underlying socket */
private final Socket _socket;
/**
* Optional {@link ExecutorService} for final flush.
*/
private final ExecutorService _shutdownExecutor;
/** Socket's inputstream - data from the broker - synchronized on */
private final DataInputStream _inputStream;
/** Socket's outputstream - data to the broker - synchronized on */
private final DataOutputStream _outputStream;
private final int maxInboundMessageBodySize;
/** Time to linger before closing the socket forcefully. */
public static final int SOCKET_CLOSING_TIMEOUT = 1;
/**
* @param socket the socket to use
*/
public SocketFrameHandler(Socket socket) throws IOException {
this(socket, null, Integer.MAX_VALUE);
}
/**
* @param socket the socket to use
*/
public SocketFrameHandler(Socket socket, ExecutorService shutdownExecutor,
int maxInboundMessageBodySize) throws IOException {
_socket = socket;
_shutdownExecutor = shutdownExecutor;
this.maxInboundMessageBodySize = maxInboundMessageBodySize;
_inputStream = new DataInputStream(new BufferedInputStream(socket.getInputStream()));
_outputStream = new DataOutputStream(new BufferedOutputStream(socket.getOutputStream()));
}
@Override
public InetAddress getAddress() {
return _socket.getInetAddress();
}
@Override
public InetAddress getLocalAddress() {
return _socket.getLocalAddress();
}
// For testing only
public DataInputStream getInputStream() {
return _inputStream;
}
@Override
public int getPort() {
return _socket.getPort();
}
@Override
public int getLocalPort() {
return _socket.getLocalPort();
}
@Override
public void setTimeout(int timeoutMs)
throws SocketException
{
_socket.setSoTimeout(timeoutMs);
}
@Override
public int getTimeout()
throws SocketException
{
return _socket.getSoTimeout();
}
/**
* Write a 0-8-style connection header to the underlying socket,
* containing the specified version information, kickstarting the
* AMQP protocol version negotiation process.
*
* @param major major protocol version number
* @param minor minor protocol version number
* @throws IOException if there is a problem accessing the connection
* @see #sendHeader()
*/
public void sendHeader(int major, int minor) throws IOException {
synchronized (_outputStream) {
_outputStream.write("AMQP".getBytes("US-ASCII"));
_outputStream.write(1);
_outputStream.write(1);
_outputStream.write(major);
_outputStream.write(minor);
try {
_outputStream.flush();
} catch (SSLHandshakeException e) {
LOGGER.error("TLS connection failed: {}", e.getMessage());
throw e;
}
}
}
/**
* Write a 0-9-1-style connection header to the underlying socket,
* containing the specified version information, kickstarting the
* AMQP protocol version negotiation process.
*
* @param major major protocol version number
* @param minor minor protocol version number
* @param revision protocol revision number
* @throws IOException if there is a problem accessing the connection
* @see #sendHeader()
*/
public void sendHeader(int major, int minor, int revision) throws IOException {
synchronized (_outputStream) {
_outputStream.write("AMQP".getBytes("US-ASCII"));
_outputStream.write(0);
_outputStream.write(major);
_outputStream.write(minor);
_outputStream.write(revision);
try {
_outputStream.flush();
} catch (SSLHandshakeException e) {
LOGGER.error("TLS connection failed: {}", e.getMessage());
throw e;
}
}
}
@Override
public void sendHeader() throws IOException {
sendHeader(AMQP.PROTOCOL.MAJOR, AMQP.PROTOCOL.MINOR, AMQP.PROTOCOL.REVISION);
if (this._socket instanceof SSLSocket) {
TlsUtils.logPeerCertificateInfo(((SSLSocket) this._socket).getSession());
}
}
@Override
public void initialize(AMQConnection connection) {
connection.startMainLoop();
}
@Override
public Frame readFrame() throws IOException {
synchronized (_inputStream) {
return Frame.readFrom(_inputStream, this.maxInboundMessageBodySize);
}
}
@Override
public void writeFrame(Frame frame) throws IOException {
synchronized (_outputStream) {
frame.writeTo(_outputStream);
}
}
@Override
public void flush() throws IOException {
_outputStream.flush();
}
@Override
public void close() {
try { _socket.setSoLinger(true, SOCKET_CLOSING_TIMEOUT); } catch (Exception _e) {}
// async flush if possible
// see https://github.com/rabbitmq/rabbitmq-java-client/issues/194
Callable flushCallable = new Callable() {
@Override
public Void call() throws Exception {
flush();
return null;
}
};
Future flushTask = null;
try {
if(this._shutdownExecutor == null) {
flushCallable.call();
} else {
flushTask = this._shutdownExecutor.submit(flushCallable);
flushTask.get(SOCKET_CLOSING_TIMEOUT, TimeUnit.SECONDS);
}
} catch(Exception e) {
if(flushTask != null) {
flushTask.cancel(true);
}
}
try { _socket.close(); } catch (Exception _e) {}
}
}