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NettySimpleAmqpServer.java
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NettySimpleAmqpServer.java
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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF 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.apache.qpid.jms.transports.netty;
import static org.apache.qpid.jms.provider.amqp.AmqpSupport.ANONYMOUS_RELAY;
import static org.apache.qpid.jms.provider.amqp.AmqpSupport.CONNECTION_OPEN_FAILED;
import static org.apache.qpid.jms.provider.amqp.AmqpSupport.CONTAINER_ID;
import static org.apache.qpid.jms.provider.amqp.AmqpSupport.DELAYED_DELIVERY;
import static org.apache.qpid.jms.provider.amqp.AmqpSupport.INVALID_FIELD;
import static org.apache.qpid.jms.provider.amqp.AmqpSupport.PLATFORM;
import static org.apache.qpid.jms.provider.amqp.AmqpSupport.PRODUCT;
import static org.apache.qpid.jms.provider.amqp.AmqpSupport.SOLE_CONNECTION_CAPABILITY;
import static org.apache.qpid.jms.provider.amqp.AmqpSupport.VERSION;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.util.HashMap;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.ThreadFactory;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.function.Function;
import org.apache.qpid.jms.transports.TransportOptions;
import org.apache.qpid.jms.util.IdGenerator;
import org.apache.qpid.proton.Proton;
import org.apache.qpid.proton.amqp.Symbol;
import org.apache.qpid.proton.amqp.transport.AmqpError;
import org.apache.qpid.proton.amqp.transport.ErrorCondition;
import org.apache.qpid.proton.engine.Collector;
import org.apache.qpid.proton.engine.Connection;
import org.apache.qpid.proton.engine.EndpointState;
import org.apache.qpid.proton.engine.Event;
import org.apache.qpid.proton.engine.Receiver;
import org.apache.qpid.proton.engine.Sasl;
import org.apache.qpid.proton.engine.Sender;
import org.apache.qpid.proton.engine.Session;
import org.apache.qpid.proton.engine.Transport;
import org.apache.qpid.proton.engine.impl.CollectorImpl;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelFutureListener;
import io.netty.channel.ChannelHandler;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.SimpleChannelInboundHandler;
/**
* Simple Netty based server that can handle a small subset of AMQP events
* using Proton-J as the protocol engine.
*/
@SuppressWarnings( "unused" )
public class NettySimpleAmqpServer extends NettyServer {
private static final Logger LOG = LoggerFactory.getLogger(NettySimpleAmqpServer.class);
private static final AtomicInteger SERVER_SEQUENCE = new AtomicInteger();
private static final int CHANNEL_MAX = 32767;
private static final int HEADER_SIZE = 8;
private static final int SASL_PROTOCOL = 3;
private final Map<String, List<Connection>> connections = new HashMap<String, List<Connection>>();
private final ScheduledExecutorService serializer;
private boolean allowNonSaslConnections;
private ConnectionIntercepter connectionIntercepter;
public NettySimpleAmqpServer(TransportOptions options, boolean secure) {
this(options, secure, false);
}
public NettySimpleAmqpServer(TransportOptions options, boolean secure, boolean needClientAuth) {
this(options, secure, needClientAuth, false);
}
public NettySimpleAmqpServer(TransportOptions options, boolean secure, boolean needClientAuth, boolean webSocketServer) {
super(options, secure, needClientAuth, webSocketServer);
this.serializer = Executors.newSingleThreadScheduledExecutor(new ThreadFactory() {
@Override
public Thread newThread(Runnable runner) {
Thread serial = new Thread(runner);
serial.setDaemon(true);
serial.setName(NettySimpleAmqpServer.this.getClass().getSimpleName() + ":(" +
SERVER_SEQUENCE.incrementAndGet() + "):Worker");
return serial;
}
});
}
@Override
protected ChannelHandler getServerHandler() {
return new ProtonConnection();
}
/**
* @return true if this server allows non-SASL connection.
*/
public boolean isAllowNonSaslConnections() {
return allowNonSaslConnections;
}
/**
* Used to control whether the server allows non-SASL connections or not.
*
* @param allowNonSaslConnections
* the configuration for allowing non-SASL connections
*/
public void setAllowNonSaslConnections(boolean allowNonSaslConnections) {
this.allowNonSaslConnections = allowNonSaslConnections;
}
//----- Connection Handler -----------------------------------------------//
private final class ProtonConnection extends SimpleChannelInboundHandler<ByteBuf> {
private final IdGenerator sessionIdGenerator = new IdGenerator();
private final Transport protonTransport = Proton.transport();
private final Connection protonConnection = Proton.connection();
private final Collector eventCollector = new CollectorImpl();
private SaslAuthenticator authenticator;
private final Map<String, ProtonSession> sessions = new HashMap<String, ProtonSession>();
private boolean exclusiveContainerId;
private boolean headerRead;
private final ByteBuf headerBuf = Unpooled.buffer(HEADER_SIZE, HEADER_SIZE);
public ProtonConnection() {
this.protonTransport.bind(this.protonConnection);
this.protonTransport.setChannelMax(CHANNEL_MAX);
this.protonTransport.setEmitFlowEventOnSend(false);
this.protonConnection.collect(eventCollector);
}
public boolean isExclusiveContainerId() {
return exclusiveContainerId;
}
@Override
public void channelRead0(ChannelHandlerContext ctx, ByteBuf input) {
LOG.debug("AMQP Server Channel read: {}", input);
ChannelFutureListener writeCompletionAction = null;
try {
if (!headerRead) {
processIncomingHeader(ctx, input);
} else {
pourIntoProton(input);
}
} catch (Throwable e) {
ctx.writeAndFlush(Unpooled.EMPTY_BUFFER).addListener(ChannelFutureListener.CLOSE);
return;
}
try {
if (authenticator != null) {
processSaslExchange();
} else {
processProtonEvents();
}
} catch (Throwable e) {
writeCompletionAction = ChannelFutureListener.CLOSE;
} finally {
if (protonConnection.getLocalState() == EndpointState.CLOSED) {
writeCompletionAction = ChannelFutureListener.CLOSE;
}
pumpProtonToChannel(ctx, writeCompletionAction);
}
}
private void processIncomingHeader(ChannelHandlerContext ctx, ByteBuf buffer) throws Exception {
headerBuf.writeBytes(buffer, Math.min(HEADER_SIZE, buffer.readableBytes()));
if (headerBuf.writableBytes() == 0) {
headerRead = true;
AmqpHeader header = new AmqpHeader(headerBuf);
if (isHeaderValid(header, authenticator != null)) {
LOG.trace("Connection from an AMQP v1.0 client initiated. {}", header);
} else {
LOG.warn("Connection attempt from unsupported AMQP client. {}", header);
AmqpHeader reply = getMinimallySupportedHeader();
ctx.write(reply.getBuffer());
throw new IOException("Connection from client using unsupported AMQP attempted");
}
switch (header.getProtocolId()) {
case 0: // non-SASL
authenticator = null;
break;
case 3: // SASL
authenticator = new SaslAuthenticator(this);
break;
default:
}
pourIntoProton(headerBuf);
}
pourIntoProton(buffer);
}
private void processSaslExchange() {
authenticator.processSaslExchange();
if (authenticator.isDone()) {
headerRead = false;
headerBuf.resetWriterIndex();
}
}
private void processProtonEvents() throws Exception {
Event event = null;
while ((event = eventCollector.peek()) != null) {
LOG.trace("Server: Processing event: {}", event.getType());
switch (event.getType()) {
case CONNECTION_REMOTE_OPEN:
processConnectionOpen(event.getConnection());
break;
case CONNECTION_REMOTE_CLOSE:
processConnectionClose(event.getConnection());
break;
case SESSION_REMOTE_OPEN:
processSessionOpen(event.getSession());
break;
case SESSION_REMOTE_CLOSE:
processSessionClose(event.getSession());
break;
case LINK_REMOTE_OPEN:
//processLinkOpen(event.getLink());
break;
case LINK_REMOTE_DETACH:
//processLinkDetach(event.getLink());
break;
case LINK_REMOTE_CLOSE:
//processLinkClose(event.getLink());
break;
case LINK_FLOW:
//processLinkFlow(event.getLink());
break;
case DELIVERY:
//processDelivery(event.getDelivery());
break;
default:
break;
}
eventCollector.pop();
}
}
protected void processConnectionOpen(Connection connection) throws Exception {
ErrorCondition failure = null;
protonConnection.setContext(this);
protonConnection.setOfferedCapabilities(getConnectionCapabilitiesOffered());
protonConnection.setProperties(getConnetionProperties());
protonConnection.setContainer("Netty-Server");
protonConnection.open();
if (connectionIntercepter != null) {
failure = connectionIntercepter.apply(connection);
}
if (failure == null) {
failure = handleConnectionRegistration(connection);
}
if (failure != null) {
protonConnection.setProperties(getFailedConnetionProperties());
protonConnection.setCondition(failure);
protonConnection.close();
}
}
protected void processConnectionClose(Connection connection) throws Exception {
unregisterConnection(connection);
protonConnection.close();
protonConnection.free();
}
private void processSessionClose(Session session) {
ProtonSession protonSession = (ProtonSession) session.getContext();
sessions.remove(protonSession.getId());
session.close();
session.free();
}
private void processSessionOpen(Session session) {
ProtonSession protonSession = new ProtonSession(sessionIdGenerator.generateId(), session);
sessions.put(protonSession.getId(), protonSession);
session.open();
}
void pumpProtonToChannel(ChannelHandlerContext ctx, ChannelFutureListener writeCompletionAction) {
boolean done = false;
while (!done) {
ByteBuffer toWrite = protonTransport.getOutputBuffer();
if (toWrite != null && toWrite.hasRemaining()) {
LOG.trace("Server: Sending {} bytes out", toWrite.limit());
ctx.write(Unpooled.wrappedBuffer(toWrite));
toWrite.position(toWrite.limit());
protonTransport.outputConsumed();
} else {
done = true;
}
}
if (writeCompletionAction != null) {
ctx.writeAndFlush(Unpooled.EMPTY_BUFFER).addListener(writeCompletionAction);
} else {
ctx.flush();
}
}
private void pourIntoProton(ByteBuf buffer) {
if (buffer.readableBytes() > 0) {
ByteBuffer source = buffer.nioBuffer();
do {
ByteBuffer input = protonTransport.getInputBuffer();
int limit = Math.min(input.remaining(), source.remaining());
ByteBuffer duplicate = source.duplicate();
duplicate.limit(source.position() + limit);
input.put(duplicate);
protonTransport.processInput();
source.position(source.position() + limit);
} while (source.hasRemaining());
}
}
private ErrorCondition handleConnectionRegistration(Connection connection) {
ErrorCondition failure = null;
Symbol[] desiredCapabilities = connection.getRemoteDesiredCapabilities();
for (Symbol desiredCapability : desiredCapabilities) {
if (desiredCapability.equals(SOLE_CONNECTION_CAPABILITY)) {
exclusiveContainerId = true;
}
}
String containerId = connection.getContainer();
if (exclusiveContainerId) {
if (containerId == null || containerId.isEmpty()) {
failure = new ErrorCondition(AmqpError.INVALID_FIELD,
"Connection with sole connection capability must provide a container ID");
Map<Symbol, Object> infoMap = new HashMap<Symbol, Object> ();
infoMap.put(INVALID_FIELD, CONTAINER_ID);
failure.setInfo(infoMap);
}
}
if (failure == null && !registerNewConnection(connection, exclusiveContainerId)) {
failure = new ErrorCondition(AmqpError.INVALID_FIELD,
"Client already connected with exclusive container Id.");
Map<Symbol, Object> infoMap = new HashMap<Symbol, Object> ();
infoMap.put(INVALID_FIELD, CONTAINER_ID);
failure.setInfo(infoMap);
}
return failure;
}
}
//----- Server Helper Methods --------------------------------------------//
private synchronized boolean registerNewConnection(Connection connection, boolean exclusiveContainerId) {
String containerId = connection.getContainer();
List<Connection> connectionList = this.connections.get(containerId);
if (connectionList == null) {
connectionList = new LinkedList<Connection>();
connections.put(containerId, connectionList);
}
if (exclusiveContainerId && !connectionList.isEmpty()) {
return false;
} else {
Connection head = connectionList.isEmpty() ? null : connectionList.get(0);
if (head != null) {
ProtonConnection protonConnection = (ProtonConnection)head.getContext();
if (protonConnection.isExclusiveContainerId()) {
return false;
}
}
connectionList.add(connection);
return true;
}
}
private synchronized void unregisterConnection(Connection connection) {
String containerId = connection.getContainer();
List<Connection> connectionList = this.connections.get(containerId);
if (connectionList != null) {
Iterator<Connection> iterator = connectionList.iterator();
while (iterator.hasNext()) {
Connection registeredConnection = iterator.next();
if (registeredConnection.equals(connection)) {
iterator.remove();
return;
}
}
}
}
private Symbol[] getConnectionCapabilitiesOffered() {
return new Symbol[]{ ANONYMOUS_RELAY, DELAYED_DELIVERY };
}
private Map<Symbol, Object> getConnetionProperties() {
Map<Symbol, Object> properties = new HashMap<Symbol, Object>();
properties.put(PRODUCT, "Qpid-JMS-NettyServer");
properties.put(VERSION, "1.0");
properties.put(PLATFORM, "java");
return properties;
}
private Map<Symbol, Object> getFailedConnetionProperties() {
Map<Symbol, Object> properties = new HashMap<Symbol, Object>();
properties.put(CONNECTION_OPEN_FAILED, true);
return properties;
}
private boolean isHeaderValid(AmqpHeader header, boolean authenticated) {
if (!header.hasValidPrefix()) {
return false;
}
if (!(header.getProtocolId() == 0 || header.getProtocolId() == SASL_PROTOCOL)) {
return false;
}
if (!authenticated && !isAllowNonSaslConnections() && header.getProtocolId() != SASL_PROTOCOL) {
return false;
}
if (header.getMajor() != 1 || header.getMinor() != 0 || header.getRevision() != 0) {
return false;
}
return true;
}
private AmqpHeader getMinimallySupportedHeader() {
AmqpHeader header = new AmqpHeader();
if (!isAllowNonSaslConnections()) {
header.setProtocolId(3);
}
return header;
}
//----- Server Event Intercepter -----------------------------------------//
public ConnectionIntercepter getConnectionIntercepter() {
return connectionIntercepter;
}
public void setConnectionIntercepter(ConnectionIntercepter connectionIntercepter) {
this.connectionIntercepter = connectionIntercepter;
}
@FunctionalInterface
public interface ConnectionIntercepter extends Function<Connection, ErrorCondition> {
@Override
ErrorCondition apply(Connection connection);
}
//----- Session Manager --------------------------------------------------//
private class ProtonSession {
private final String sessionId;
private final Session session;
private Map<String, ProtonSender> senders = new HashMap<String, ProtonSender>();
private Map<String, ProtonReceiver> receivers = new HashMap<String, ProtonReceiver>();
public ProtonSession(String sessionId, Session session) {
this.sessionId = sessionId;
this.session = session;
this.session.setContext(this);
}
public Session getSession() {
return session;
}
public String getId() {
return sessionId;
}
}
//----- Sender Manager ---------------------------------------------------//
private class ProtonSender {
private final String senderId;
private final Sender sender;
public ProtonSender(String senderId, Sender sender) {
this.senderId = senderId;
this.sender = sender;
}
public String getId() {
return senderId;
}
public Sender getSender() {
return sender;
}
}
//----- Receiver Manager ---------------------------------------------------//
private class ProtonReceiver {
private final String receiverId;
private final Receiver receiver;
public ProtonReceiver(String receiverId, Receiver receiver) {
this.receiverId = receiverId;
this.receiver = receiver;
}
public String getId() {
return receiverId;
}
public Receiver getReceiver() {
return receiver;
}
}
//----- SASL Authentication Manager --------------------------------------//
private class SaslAuthenticator {
private final String[] mechanisms = new String[] { "PLAIN", "ANONYMOUS" };
private final Sasl protonSasl;
public SaslAuthenticator(ProtonConnection connection) {
protonSasl = connection.protonTransport.sasl();
protonSasl.setMechanisms(mechanisms);
protonSasl.server();
}
public boolean isDone() {
return protonSasl.getOutcome() != Sasl.SaslOutcome.PN_SASL_NONE;
}
public void processSaslExchange() {
if (protonSasl.getRemoteMechanisms().length > 0) {
String[] mechanisms = protonSasl.getRemoteMechanisms();
if (mechanisms != null && mechanisms.length > 0) {
LOG.debug("SASL [{}} Handshake started.", mechanisms[0]);
if (mechanisms[0].equalsIgnoreCase("PLAIN")) {
byte[] data = new byte[protonSasl.pending()];
protonSasl.recv(data, 0, data.length);
protonSasl.done(Sasl.SaslOutcome.PN_SASL_OK);
} else if (mechanisms[0].equalsIgnoreCase("ANONYMOUS")) {
protonSasl.done(Sasl.SaslOutcome.PN_SASL_OK);
} else {
protonSasl.done(Sasl.SaslOutcome.PN_SASL_PERM);
}
} else {
LOG.info("SASL: could not find supported mechanism");
protonSasl.done(Sasl.SaslOutcome.PN_SASL_PERM);
}
}
}
}
//----- Simple AMQP Header Wrapper ---------------------------------------//
private class AmqpHeader {
private final byte[] PREFIX = new byte[] { 'A', 'M', 'Q', 'P' };
private final byte[] buffer = new byte[HEADER_SIZE];
public AmqpHeader() {
this(Unpooled.wrappedBuffer(new byte[] { 'A', 'M', 'Q', 'P', 0, 1, 0, 0 }));
}
public AmqpHeader(ByteBuf buffer) {
this(buffer, true);
}
public AmqpHeader(ByteBuf buffer, boolean validate) {
setBuffer(buffer, validate);
}
public int getProtocolId() {
return buffer[4] & 0xFF;
}
public void setProtocolId(int value) {
buffer[4] = (byte) value;
}
public int getMajor() {
return buffer[5] & 0xFF;
}
public void setMajor(int value) {
buffer[5] = (byte) value;
}
public int getMinor() {
return buffer[6] & 0xFF;
}
public void setMinor(int value) {
buffer[6] = (byte) value;
}
public int getRevision() {
return buffer[7] & 0xFF;
}
public void setRevision(int value) {
buffer[7] = (byte) value;
}
public ByteBuf getBuffer() {
return Unpooled.wrappedBuffer(buffer);
}
public void setBuffer(ByteBuf value) {
setBuffer(value, true);
}
public void setBuffer(ByteBuf value, boolean validate) {
if (validate && !hasValidPrefix(value) || value.array().length != 8) {
throw new IllegalArgumentException("Not an AMQP header buffer");
}
value.getBytes(0, buffer, 0, 8);
}
public boolean hasValidPrefix() {
return hasValidPrefix(getBuffer());
}
private boolean hasValidPrefix(ByteBuf buffer) {
return buffer.getByte(0) == PREFIX[0] &&
buffer.getByte(1) == PREFIX[1] &&
buffer.getByte(2) == PREFIX[2] &&
buffer.getByte(3) == PREFIX[3];
}
@Override
public String toString() {
StringBuilder builder = new StringBuilder();
for (int i = 0; i < HEADER_SIZE; ++i) {
char value = (char) buffer[i];
if (Character.isLetter(value)) {
builder.append(value);
} else {
builder.append(",");
builder.append((int) value);
}
}
return builder.toString();
}
}
}