org.springframework.web.reactive.socket.adapter.JettyWebSocketHandlerAdapter Maven / Gradle / Ivy
/*
* Copyright 2002-2018 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
*
* https://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.reactive.socket.adapter;
import java.nio.ByteBuffer;
import java.nio.charset.StandardCharsets;
import java.util.function.Function;
import org.eclipse.jetty.websocket.api.Session;
import org.eclipse.jetty.websocket.api.annotations.OnWebSocketClose;
import org.eclipse.jetty.websocket.api.annotations.OnWebSocketConnect;
import org.eclipse.jetty.websocket.api.annotations.OnWebSocketError;
import org.eclipse.jetty.websocket.api.annotations.OnWebSocketFrame;
import org.eclipse.jetty.websocket.api.annotations.OnWebSocketMessage;
import org.eclipse.jetty.websocket.api.annotations.WebSocket;
import org.eclipse.jetty.websocket.api.extensions.Frame;
import org.eclipse.jetty.websocket.common.OpCode;
import org.springframework.core.io.buffer.DataBuffer;
import org.springframework.lang.Nullable;
import org.springframework.util.Assert;
import org.springframework.web.reactive.socket.CloseStatus;
import org.springframework.web.reactive.socket.WebSocketHandler;
import org.springframework.web.reactive.socket.WebSocketMessage;
import org.springframework.web.reactive.socket.WebSocketMessage.Type;
import org.springframework.web.reactive.socket.WebSocketSession;
/**
* Jetty {@link WebSocket @WebSocket} handler that delegates events to a
* reactive {@link WebSocketHandler} and its session.
*
* @author Violeta Georgieva
* @author Rossen Stoyanchev
* @since 5.0
*/
@WebSocket
public class JettyWebSocketHandlerAdapter {
private static final ByteBuffer EMPTY_PAYLOAD = ByteBuffer.wrap(new byte[0]);
private final WebSocketHandler delegateHandler;
private final Function sessionFactory;
@Nullable
private JettyWebSocketSession delegateSession;
public JettyWebSocketHandlerAdapter(WebSocketHandler handler,
Function sessionFactory) {
Assert.notNull(handler, "WebSocketHandler is required");
Assert.notNull(sessionFactory, "'sessionFactory' is required");
this.delegateHandler = handler;
this.sessionFactory = sessionFactory;
}
@OnWebSocketConnect
public void onWebSocketConnect(Session session) {
this.delegateSession = this.sessionFactory.apply(session);
this.delegateHandler.handle(this.delegateSession).subscribe(this.delegateSession);
}
@OnWebSocketMessage
public void onWebSocketText(String message) {
if (this.delegateSession != null) {
WebSocketMessage webSocketMessage = toMessage(Type.TEXT, message);
this.delegateSession.handleMessage(webSocketMessage.getType(), webSocketMessage);
}
}
@OnWebSocketMessage
public void onWebSocketBinary(byte[] message, int offset, int length) {
if (this.delegateSession != null) {
ByteBuffer buffer = ByteBuffer.wrap(message, offset, length);
WebSocketMessage webSocketMessage = toMessage(Type.BINARY, buffer);
this.delegateSession.handleMessage(webSocketMessage.getType(), webSocketMessage);
}
}
@OnWebSocketFrame
public void onWebSocketFrame(Frame frame) {
if (this.delegateSession != null) {
if (OpCode.PONG == frame.getOpCode()) {
ByteBuffer buffer = (frame.getPayload() != null ? frame.getPayload() : EMPTY_PAYLOAD);
WebSocketMessage webSocketMessage = toMessage(Type.PONG, buffer);
this.delegateSession.handleMessage(webSocketMessage.getType(), webSocketMessage);
}
}
}
private WebSocketMessage toMessage(Type type, T message) {
WebSocketSession session = this.delegateSession;
Assert.state(session != null, "Cannot create message without a session");
if (Type.TEXT.equals(type)) {
byte[] bytes = ((String) message).getBytes(StandardCharsets.UTF_8);
DataBuffer buffer = session.bufferFactory().wrap(bytes);
return new WebSocketMessage(Type.TEXT, buffer);
}
else if (Type.BINARY.equals(type)) {
DataBuffer buffer = session.bufferFactory().wrap((ByteBuffer) message);
return new WebSocketMessage(Type.BINARY, buffer);
}
else if (Type.PONG.equals(type)) {
DataBuffer buffer = session.bufferFactory().wrap((ByteBuffer) message);
return new WebSocketMessage(Type.PONG, buffer);
}
else {
throw new IllegalArgumentException("Unexpected message type: " + message);
}
}
@OnWebSocketClose
public void onWebSocketClose(int statusCode, String reason) {
if (this.delegateSession != null) {
this.delegateSession.handleClose(new CloseStatus(statusCode, reason));
}
}
@OnWebSocketError
public void onWebSocketError(Throwable cause) {
if (this.delegateSession != null) {
this.delegateSession.handleError(cause);
}
}
}