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/*
* 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
*
* 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.reactive.socket.adapter;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.charset.StandardCharsets;
import io.undertow.websockets.core.CloseMessage;
import io.undertow.websockets.core.WebSocketCallback;
import io.undertow.websockets.core.WebSocketChannel;
import io.undertow.websockets.core.WebSockets;
import reactor.core.publisher.Mono;
import reactor.core.publisher.MonoProcessor;
import org.springframework.core.io.buffer.DataBuffer;
import org.springframework.core.io.buffer.DataBufferFactory;
import org.springframework.core.io.buffer.DataBufferUtils;
import org.springframework.lang.Nullable;
import org.springframework.util.ObjectUtils;
import org.springframework.web.reactive.socket.CloseStatus;
import org.springframework.web.reactive.socket.HandshakeInfo;
import org.springframework.web.reactive.socket.WebSocketMessage;
import org.springframework.web.reactive.socket.WebSocketSession;
/**
* Spring {@link WebSocketSession} implementation that adapts to an Undertow
* {@link io.undertow.websockets.core.WebSocketChannel}.
*
* @author Violeta Georgieva
* @author Rossen Stoyanchev
* @since 5.0
*/
public class UndertowWebSocketSession extends AbstractListenerWebSocketSession {
public UndertowWebSocketSession(WebSocketChannel channel, HandshakeInfo info, DataBufferFactory factory) {
this(channel, info, factory, null);
}
public UndertowWebSocketSession(WebSocketChannel channel, HandshakeInfo info,
DataBufferFactory factory, @Nullable MonoProcessor completionMono) {
super(channel, ObjectUtils.getIdentityHexString(channel), info, factory, completionMono);
suspendReceiving();
}
@Override
protected boolean canSuspendReceiving() {
return true;
}
@Override
protected void suspendReceiving() {
getDelegate().suspendReceives();
}
@Override
protected void resumeReceiving() {
getDelegate().resumeReceives();
}
@Override
protected boolean sendMessage(WebSocketMessage message) throws IOException {
ByteBuffer buffer = message.getPayload().asByteBuffer();
if (WebSocketMessage.Type.TEXT.equals(message.getType())) {
getSendProcessor().setReadyToSend(false);
String text = new String(buffer.array(), StandardCharsets.UTF_8);
WebSockets.sendText(text, getDelegate(), new SendProcessorCallback(message.getPayload()));
}
else if (WebSocketMessage.Type.BINARY.equals(message.getType())) {
getSendProcessor().setReadyToSend(false);
WebSockets.sendBinary(buffer, getDelegate(), new SendProcessorCallback(message.getPayload()));
}
else if (WebSocketMessage.Type.PING.equals(message.getType())) {
getSendProcessor().setReadyToSend(false);
WebSockets.sendPing(buffer, getDelegate(), new SendProcessorCallback(message.getPayload()));
}
else if (WebSocketMessage.Type.PONG.equals(message.getType())) {
getSendProcessor().setReadyToSend(false);
WebSockets.sendPong(buffer, getDelegate(), new SendProcessorCallback(message.getPayload()));
}
else {
throw new IllegalArgumentException("Unexpected message type: " + message.getType());
}
return true;
}
@Override
public Mono close(CloseStatus status) {
CloseMessage cm = new CloseMessage(status.getCode(), status.getReason());
if (!getDelegate().isCloseFrameSent()) {
WebSockets.sendClose(cm, getDelegate(), null);
}
return Mono.empty();
}
private final class SendProcessorCallback implements WebSocketCallback {
private final DataBuffer payload;
SendProcessorCallback(DataBuffer payload) {
this.payload = payload;
}
@Override
public void complete(WebSocketChannel channel, Void context) {
DataBufferUtils.release(this.payload);
getSendProcessor().setReadyToSend(true);
getSendProcessor().onWritePossible();
}
@Override
public void onError(WebSocketChannel channel, Void context, Throwable throwable) {
DataBufferUtils.release(this.payload);
getSendProcessor().cancel();
getSendProcessor().onError(throwable);
}
}
}