/*
* Copyright 2002-2016 the original author or authors.
*
* Licensed 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.springframework.web.socket.messaging;
import java.io.IOException;
import java.net.URI;
import java.nio.ByteBuffer;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.concurrent.ScheduledFuture;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.context.Lifecycle;
import org.springframework.context.SmartLifecycle;
import org.springframework.messaging.Message;
import org.springframework.messaging.simp.stomp.BufferingStompDecoder;
import org.springframework.messaging.simp.stomp.ConnectionHandlingStompSession;
import org.springframework.messaging.simp.stomp.StompClientSupport;
import org.springframework.messaging.simp.stomp.StompDecoder;
import org.springframework.messaging.simp.stomp.StompEncoder;
import org.springframework.messaging.simp.stomp.StompHeaderAccessor;
import org.springframework.messaging.simp.stomp.StompHeaders;
import org.springframework.messaging.simp.stomp.StompSession;
import org.springframework.messaging.simp.stomp.StompSessionHandler;
import org.springframework.messaging.support.MessageHeaderAccessor;
import org.springframework.messaging.tcp.TcpConnection;
import org.springframework.messaging.tcp.TcpConnectionHandler;
import org.springframework.scheduling.TaskScheduler;
import org.springframework.util.Assert;
import org.springframework.util.MimeTypeUtils;
import org.springframework.util.concurrent.ListenableFuture;
import org.springframework.util.concurrent.ListenableFutureCallback;
import org.springframework.util.concurrent.SettableListenableFuture;
import org.springframework.web.socket.BinaryMessage;
import org.springframework.web.socket.CloseStatus;
import org.springframework.web.socket.TextMessage;
import org.springframework.web.socket.WebSocketHandler;
import org.springframework.web.socket.WebSocketHttpHeaders;
import org.springframework.web.socket.WebSocketMessage;
import org.springframework.web.socket.WebSocketSession;
import org.springframework.web.socket.client.WebSocketClient;
import org.springframework.web.socket.sockjs.transport.SockJsSession;
import org.springframework.web.util.UriComponentsBuilder;
/**
* A STOMP over WebSocket client that connects using an implementation of
* {@link org.springframework.web.socket.client.WebSocketClient WebSocketClient}
* including {@link org.springframework.web.socket.sockjs.client.SockJsClient
* SockJsClient}.
*
* @author Rossen Stoyanchev
* @since 4.2
*/
public class WebSocketStompClient extends StompClientSupport implements SmartLifecycle {
private static final Log logger = LogFactory.getLog(WebSocketStompClient.class);
private final WebSocketClient webSocketClient;
private int inboundMessageSizeLimit = 64 * 1024;
private boolean autoStartup = true;
private boolean running = false;
private int phase = Integer.MAX_VALUE;
/**
* Class constructor. Sets {@link #setDefaultHeartbeat} to "0,0" but will
* reset it back to the preferred "10000,10000" when a
* {@link #setTaskScheduler} is configured.
* @param webSocketClient the WebSocket client to connect with
*/
public WebSocketStompClient(WebSocketClient webSocketClient) {
Assert.notNull(webSocketClient, "WebSocketClient is required");
this.webSocketClient = webSocketClient;
setDefaultHeartbeat(new long[] {0, 0});
}
/**
* Return the configured WebSocketClient.
*/
public WebSocketClient getWebSocketClient() {
return this.webSocketClient;
}
/**
* {@inheritDoc}
* <p>Also automatically sets the {@link #setDefaultHeartbeat defaultHeartbeat}
* property to "10000,10000" if it is currently set to "0,0".
*/
@Override
public void setTaskScheduler(TaskScheduler taskScheduler) {
if (taskScheduler != null && !isDefaultHeartbeatEnabled()) {
setDefaultHeartbeat(new long[] {10000, 10000});
}
super.setTaskScheduler(taskScheduler);
}
/**
* Configure the maximum size allowed for inbound STOMP message.
* Since a STOMP message can be received in multiple WebSocket messages,
* buffering may be required and this property determines the maximum buffer
* size per message.
* <p>By default this is set to 64 * 1024 (64K).
*/
public void setInboundMessageSizeLimit(int inboundMessageSizeLimit) {
this.inboundMessageSizeLimit = inboundMessageSizeLimit;
}
/**
* Get the configured inbound message buffer size in bytes.
*/
public int getInboundMessageSizeLimit() {
return this.inboundMessageSizeLimit;
}
/**
* Set whether to auto-start the contained WebSocketClient when the Spring
* context has been refreshed.
* <p>Default is "true".
*/
public void setAutoStartup(boolean autoStartup) {
this.autoStartup = autoStartup;
}
/**
* Return the value for the 'autoStartup' property. If "true", this client
* will automatically start and stop the contained WebSocketClient.
*/
@Override
public boolean isAutoStartup() {
return this.autoStartup;
}
/**
* Specify the phase in which the WebSocket client should be started and
* subsequently closed. The startup order proceeds from lowest to highest,
* and the shutdown order is the reverse of that.
* <p>By default this is Integer.MAX_VALUE meaning that the WebSocket client
* is started as late as possible and stopped as soon as possible.
*/
public void setPhase(int phase) {
this.phase = phase;
}
/**
* Return the configured phase.
*/
@Override
public int getPhase() {
return this.phase;
}
@Override
public void start() {
if (!isRunning()) {
this.running = true;
if (getWebSocketClient() instanceof Lifecycle) {
((Lifecycle) getWebSocketClient()).start();
}
}
}
@Override
public void stop() {
if (isRunning()) {
this.running = false;
if (getWebSocketClient() instanceof Lifecycle) {
((Lifecycle) getWebSocketClient()).stop();
}
}
}
@Override
public void stop(Runnable callback) {
stop();
callback.run();
}
@Override
public boolean isRunning() {
return this.running;
}
/**
* Connect to the given WebSocket URL and notify the given
* {@link org.springframework.messaging.simp.stomp.StompSessionHandler}
* when connected on the STOMP level after the CONNECTED frame is received.
* @param url the url to connect to
* @param handler the session handler
* @param uriVars URI variables to expand into the URL
* @return ListenableFuture for access to the session when ready for use
*/
public ListenableFuture<StompSession> connect(String url, StompSessionHandler handler, Object... uriVars) {
return connect(url, null, handler, uriVars);
}
/**
* An overloaded version of
* {@link #connect(String, StompSessionHandler, Object...)} that also
* accepts {@link WebSocketHttpHeaders} to use for the WebSocket handshake.
* @param url the url to connect to
* @param handshakeHeaders the headers for the WebSocket handshake
* @param handler the session handler
* @param uriVariables URI variables to expand into the URL
* @return ListenableFuture for access to the session when ready for use
*/
public ListenableFuture<StompSession> connect(String url, WebSocketHttpHeaders handshakeHeaders,
StompSessionHandler handler, Object... uriVariables) {
return connect(url, handshakeHeaders, null, handler, uriVariables);
}
/**
* An overloaded version of
* {@link #connect(String, StompSessionHandler, Object...)} that also accepts
* {@link WebSocketHttpHeaders} to use for the WebSocket handshake and
* {@link StompHeaders} for the STOMP CONNECT frame.
* @param url the url to connect to
* @param handshakeHeaders headers for the WebSocket handshake
* @param connectHeaders headers for the STOMP CONNECT frame
* @param handler the session handler
* @param uriVariables URI variables to expand into the URL
* @return ListenableFuture for access to the session when ready for use
*/
public ListenableFuture<StompSession> connect(String url, WebSocketHttpHeaders handshakeHeaders,
StompHeaders connectHeaders, StompSessionHandler handler, Object... uriVariables) {
Assert.notNull(url, "'url' must not be null");
URI uri = UriComponentsBuilder.fromUriString(url).buildAndExpand(uriVariables).encode().toUri();
return connect(uri, handshakeHeaders, connectHeaders, handler);
}
/**
* An overloaded version of
* {@link #connect(String, WebSocketHttpHeaders, StompSessionHandler, Object...)}
* that accepts a fully prepared {@link java.net.URI}.
* @param url the url to connect to
* @param handshakeHeaders the headers for the WebSocket handshake
* @param connectHeaders headers for the STOMP CONNECT frame
* @param sessionHandler the STOMP session handler
* @return ListenableFuture for access to the session when ready for use
*/
public ListenableFuture<StompSession> connect(URI url, WebSocketHttpHeaders handshakeHeaders,
StompHeaders connectHeaders, StompSessionHandler sessionHandler) {
Assert.notNull(url, "'url' must not be null");
ConnectionHandlingStompSession session = createSession(connectHeaders, sessionHandler);
WebSocketTcpConnectionHandlerAdapter adapter = new WebSocketTcpConnectionHandlerAdapter(session);
getWebSocketClient().doHandshake(adapter, handshakeHeaders, url).addCallback(adapter);
return session.getSessionFuture();
}
@Override
protected StompHeaders processConnectHeaders(StompHeaders connectHeaders) {
connectHeaders = super.processConnectHeaders(connectHeaders);
if (connectHeaders.isHeartbeatEnabled()) {
Assert.state(getTaskScheduler() != null, "TaskScheduler must be set if heartbeats are enabled");
}
return connectHeaders;
}
/**
* Adapt WebSocket to the TcpConnectionHandler and TcpConnection contracts.
*/
private class WebSocketTcpConnectionHandlerAdapter implements ListenableFutureCallback<WebSocketSession>,
WebSocketHandler, TcpConnection<byte[]> {
private final TcpConnectionHandler<byte[]> connectionHandler;
private final StompWebSocketMessageCodec codec = new StompWebSocketMessageCodec(getInboundMessageSizeLimit());
private volatile WebSocketSession session;
private volatile long lastReadTime = -1;
private volatile long lastWriteTime = -1;
private final List<ScheduledFuture<?>> inactivityTasks = new ArrayList<>(2);
public WebSocketTcpConnectionHandlerAdapter(TcpConnectionHandler<byte[]> connectionHandler) {
Assert.notNull(connectionHandler, "TcpConnectionHandler must not be null");
this.connectionHandler = connectionHandler;
}
// ListenableFutureCallback implementation: handshake outcome
@Override
public void onSuccess(WebSocketSession webSocketSession) {
}
@Override
public void onFailure(Throwable ex) {
this.connectionHandler.afterConnectFailure(ex);
}
// WebSocketHandler implementation
@Override
public void afterConnectionEstablished(WebSocketSession session) {
this.session = session;
this.connectionHandler.afterConnected(this);
}
@Override
public void handleMessage(WebSocketSession session, WebSocketMessage<?> webSocketMessage) {
this.lastReadTime = (this.lastReadTime != -1 ? System.currentTimeMillis() : -1);
List<Message<byte[]>> messages;
try {
messages = this.codec.decode(webSocketMessage);
}
catch (Throwable ex) {
this.connectionHandler.handleFailure(ex);
return;
}
for (Message<byte[]> message : messages) {
this.connectionHandler.handleMessage(message);
}
}
@Override
public void handleTransportError(WebSocketSession session, Throwable ex) throws Exception {
this.connectionHandler.handleFailure(ex);
}
@Override
public void afterConnectionClosed(WebSocketSession session, CloseStatus closeStatus) throws Exception {
cancelInactivityTasks();
this.connectionHandler.afterConnectionClosed();
}
private void cancelInactivityTasks() {
for (ScheduledFuture<?> task : this.inactivityTasks) {
try {
task.cancel(true);
}
catch (Throwable ex) {
// Ignore
}
}
this.lastReadTime = -1;
this.lastWriteTime = -1;
this.inactivityTasks.clear();
}
@Override
public boolean supportsPartialMessages() {
return false;
}
// TcpConnection implementation
@Override
public ListenableFuture<Void> send(Message<byte[]> message) {
updateLastWriteTime();
SettableListenableFuture<Void> future = new SettableListenableFuture<>();
try {
this.session.sendMessage(this.codec.encode(message, this.session.getClass()));
future.set(null);
}
catch (Throwable ex) {
future.setException(ex);
}
finally {
updateLastWriteTime();
}
return future;
}
private void updateLastWriteTime() {
this.lastWriteTime = (this.lastWriteTime != -1 ? System.currentTimeMillis() : -1);
}
@Override
public void onReadInactivity(final Runnable runnable, final long duration) {
Assert.state(getTaskScheduler() != null, "No TaskScheduler configured");
this.lastReadTime = System.currentTimeMillis();
this.inactivityTasks.add(getTaskScheduler().scheduleWithFixedDelay(new Runnable() {
@Override
public void run() {
if (System.currentTimeMillis() - lastReadTime > duration) {
try {
runnable.run();
}
catch (Throwable ex) {
if (logger.isDebugEnabled()) {
logger.debug("ReadInactivityTask failure", ex);
}
}
}
}
}, duration / 2));
}
@Override
public void onWriteInactivity(final Runnable runnable, final long duration) {
Assert.state(getTaskScheduler() != null, "No TaskScheduler configured");
this.lastWriteTime = System.currentTimeMillis();
this.inactivityTasks.add(getTaskScheduler().scheduleWithFixedDelay(new Runnable() {
@Override
public void run() {
if (System.currentTimeMillis() - lastWriteTime > duration) {
try {
runnable.run();
}
catch (Throwable ex) {
if (logger.isDebugEnabled()) {
logger.debug("WriteInactivityTask failure", ex);
}
}
}
}
}, duration / 2));
}
@Override
public void close() {
try {
this.session.close();
}
catch (IOException ex) {
if (logger.isDebugEnabled()) {
logger.debug("Failed to close session: " + this.session.getId(), ex);
}
}
}
}
/**
* Encode and decode STOMP WebSocket messages.
*/
private static class StompWebSocketMessageCodec {
private static final StompEncoder ENCODER = new StompEncoder();
private static final StompDecoder DECODER = new StompDecoder();
private final BufferingStompDecoder bufferingDecoder;
public StompWebSocketMessageCodec(int messageSizeLimit) {
this.bufferingDecoder = new BufferingStompDecoder(DECODER, messageSizeLimit);
}
public List<Message<byte[]>> decode(WebSocketMessage<?> webSocketMessage) {
List<Message<byte[]>> result = Collections.emptyList();
ByteBuffer byteBuffer;
if (webSocketMessage instanceof TextMessage) {
byteBuffer = ByteBuffer.wrap(((TextMessage) webSocketMessage).asBytes());
}
else if (webSocketMessage instanceof BinaryMessage) {
byteBuffer = ((BinaryMessage) webSocketMessage).getPayload();
}
else {
return result;
}
result = this.bufferingDecoder.decode(byteBuffer);
if (result.isEmpty()) {
if (logger.isTraceEnabled()) {
logger.trace("Incomplete STOMP frame content received, bufferSize=" +
this.bufferingDecoder.getBufferSize() + ", bufferSizeLimit=" +
this.bufferingDecoder.getBufferSizeLimit() + ".");
}
}
return result;
}
public WebSocketMessage<?> encode(Message<byte[]> message, Class<? extends WebSocketSession> sessionType) {
StompHeaderAccessor accessor = MessageHeaderAccessor.getAccessor(message, StompHeaderAccessor.class);
Assert.notNull(accessor, "No StompHeaderAccessor available");
byte[] payload = message.getPayload();
byte[] bytes = ENCODER.encode(accessor.getMessageHeaders(), payload);
boolean useBinary = (payload.length > 0 &&
!(SockJsSession.class.isAssignableFrom(sessionType)) &&
MimeTypeUtils.APPLICATION_OCTET_STREAM.isCompatibleWith(accessor.getContentType()));
return (useBinary ? new BinaryMessage(bytes) : new TextMessage(bytes));
}
}
}