/*
* Copyright 2013-2018 Lilinfeng.
*
* 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 com.phei.netty.protocol.websocket.server;
import static io.netty.handler.codec.http.HttpHeaders.isKeepAlive;
import static io.netty.handler.codec.http.HttpHeaders.setContentLength;
import static io.netty.handler.codec.http.HttpResponseStatus.BAD_REQUEST;
import static io.netty.handler.codec.http.HttpVersion.HTTP_1_1;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelFutureListener;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.SimpleChannelInboundHandler;
import io.netty.handler.codec.http.DefaultFullHttpResponse;
import io.netty.handler.codec.http.FullHttpRequest;
import io.netty.handler.codec.http.FullHttpResponse;
import io.netty.handler.codec.http.websocketx.CloseWebSocketFrame;
import io.netty.handler.codec.http.websocketx.PingWebSocketFrame;
import io.netty.handler.codec.http.websocketx.PongWebSocketFrame;
import io.netty.handler.codec.http.websocketx.TextWebSocketFrame;
import io.netty.handler.codec.http.websocketx.WebSocketFrame;
import io.netty.handler.codec.http.websocketx.WebSocketServerHandshaker;
import io.netty.handler.codec.http.websocketx.WebSocketServerHandshakerFactory;
import io.netty.util.CharsetUtil;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
* @author lilinfeng
* @date 2014年2月14日
* @version 1.0
*/
public class WebSocketServerHandler extends SimpleChannelInboundHandler<Object> {
private static final Logger logger = Logger
.getLogger(WebSocketServerHandler.class.getName());
private WebSocketServerHandshaker handshaker;
@Override
public void messageReceived(ChannelHandlerContext ctx, Object msg)
throws Exception {
// 传统的HTTP接入
if (msg instanceof FullHttpRequest) {
handleHttpRequest(ctx, (FullHttpRequest) msg);
}
// WebSocket接入
else if (msg instanceof WebSocketFrame) {
handleWebSocketFrame(ctx, (WebSocketFrame) msg);
}
}
@Override
public void channelReadComplete(ChannelHandlerContext ctx) throws Exception {
ctx.flush();
}
private void handleHttpRequest(ChannelHandlerContext ctx,
FullHttpRequest req) throws Exception {
// 如果HTTP解码失败,返回HHTP异常
if (!req.getDecoderResult().isSuccess()
|| (!"websocket".equals(req.headers().get("Upgrade")))) {
sendHttpResponse(ctx, req, new DefaultFullHttpResponse(HTTP_1_1,
BAD_REQUEST));
return;
}
// 构造握手响应返回,本机测试
WebSocketServerHandshakerFactory wsFactory = new WebSocketServerHandshakerFactory(
"ws://localhost:8080/websocket", null, false);
handshaker = wsFactory.newHandshaker(req);
if (handshaker == null) {
WebSocketServerHandshakerFactory
.sendUnsupportedWebSocketVersionResponse(ctx.channel());
} else {
handshaker.handshake(ctx.channel(), req);
}
}
private void handleWebSocketFrame(ChannelHandlerContext ctx,
WebSocketFrame frame) {
// 判断是否是关闭链路的指令
if (frame instanceof CloseWebSocketFrame) {
handshaker.close(ctx.channel(),
(CloseWebSocketFrame) frame.retain());
return;
}
// 判断是否是Ping消息
if (frame instanceof PingWebSocketFrame) {
ctx.channel().write(
new PongWebSocketFrame(frame.content().retain()));
return;
}
// 本例程仅支持文本消息,不支持二进制消息
if (!(frame instanceof TextWebSocketFrame)) {
throw new UnsupportedOperationException(String.format(
"%s frame types not supported", frame.getClass().getName()));
}
// 返回应答消息
String request = ((TextWebSocketFrame) frame).text();
if (logger.isLoggable(Level.FINE)) {
logger.fine(String.format("%s received %s", ctx.channel(), request));
}
ctx.channel().write(
new TextWebSocketFrame(request
+ " , 欢迎使用Netty WebSocket服务,现在时刻:"
+ new java.util.Date().toString()));
}
private static void sendHttpResponse(ChannelHandlerContext ctx,
FullHttpRequest req, FullHttpResponse res) {
// 返回应答给客户端
if (res.getStatus().code() != 200) {
ByteBuf buf = Unpooled.copiedBuffer(res.getStatus().toString(),
CharsetUtil.UTF_8);
res.content().writeBytes(buf);
buf.release();
setContentLength(res, res.content().readableBytes());
}
// 如果是非Keep-Alive,关闭连接
ChannelFuture f = ctx.channel().writeAndFlush(res);
if (!isKeepAlive(req) || res.getStatus().code() != 200) {
f.addListener(ChannelFutureListener.CLOSE);
}
}
@Override
public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause)
throws Exception {
cause.printStackTrace();
ctx.close();
}
}