package org.springblade.modules.webscoket;
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import com.alibaba.fastjson.JSON;
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import com.alibaba.fastjson.JSONObject;
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import io.netty.buffer.ByteBuf;
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import io.netty.buffer.Unpooled;
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import io.netty.channel.ChannelFuture;
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import io.netty.channel.ChannelHandlerContext;
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import io.netty.channel.SimpleChannelInboundHandler;
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import io.netty.handler.codec.http.DefaultFullHttpResponse;
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import io.netty.handler.codec.http.FullHttpRequest;
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import io.netty.handler.codec.http.HttpResponseStatus;
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import io.netty.handler.codec.http.HttpVersion;
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import io.netty.handler.codec.http.websocketx.*;
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import io.netty.util.AttributeKey;
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import io.netty.util.CharsetUtil;
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import org.springblade.modules.nettyServer.NettyConfig;
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import org.springframework.beans.factory.annotation.Autowired;
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import org.springframework.stereotype.Component;
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import javax.annotation.PostConstruct;
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@Component
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public class WebSocketHandler extends SimpleChannelInboundHandler<Object> {
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private WebSocketServerHandshaker handshaker;
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private String on = null;
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private static WebSocketHandler webSocketHandler;
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@PostConstruct
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public void init() {
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webSocketHandler = this;
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}
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@Override
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protected void channelRead0(ChannelHandlerContext ctx, Object msg) throws Exception {
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if (msg instanceof FullHttpRequest) {
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//以http请求形式接入，但是走的是websocket
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handleHttpRequest(ctx, (FullHttpRequest) msg);
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} else if (msg instanceof WebSocketFrame) {
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//处理websocket客户端的消息
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handlerWebSocketFrame(ctx, (WebSocketFrame) msg);
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}
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}
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@Override
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public void channelActive(ChannelHandlerContext ctx) throws Exception {
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//添加连接
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System.out.println("客户端加入连接：" + ctx.channel());
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//ChannelSupervise.addChannel(ctx.channel());
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}
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@Override
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public void channelInactive(ChannelHandlerContext ctx) throws Exception {
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//断开连接
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System.out.println("客户端断开连接：" + ctx.channel());
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//用户离线状态
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String name = ChannelSupervise.findName(ctx.channel().id().asShortText());
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System.out.println(name);
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if (name != null && !name.equals("ping")) {
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NettyConfig.getChannelGroup().remove(ctx.channel());
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removeUserId(ctx);
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}
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}
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@Override
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public void channelReadComplete(ChannelHandlerContext ctx) throws Exception {
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ctx.flush();
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}
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private void handlerWebSocketFrame(ChannelHandlerContext ctx, WebSocketFrame frame) throws NumberFormatException, Exception {
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// 判断是否关闭链路的指令
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if (frame instanceof CloseWebSocketFrame) {
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handshaker.close(ctx.channel(), (CloseWebSocketFrame) frame.retain());
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return;
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}
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// 判断是否ping消息
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if (frame instanceof PingWebSocketFrame) {
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ctx.channel().write(
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new PongWebSocketFrame(frame.content().retain()));
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return;
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}
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// 本例程仅支持文本消息，不支持二进制消息
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if (!(frame instanceof TextWebSocketFrame)) {
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System.out.println("本例程仅支持文本消息，不支持二进制消息");
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throw new UnsupportedOperationException(String.format(
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"%s frame types not supported", frame.getClass().getName()));
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}
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// 返回应答消息
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String request = ((TextWebSocketFrame) frame).text();
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if (!request.equals("ping")) {
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JSONObject jsonObj = JSON.parseObject(request);
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String type = jsonObj.get("type").toString();
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if (type != null && type.equals("login")) {
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//登录链接
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String id = jsonObj.get("id").toString();
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NettyConfig.getUserChannelMap().put(id, ctx.channel());
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System.out.println(jsonObj.get("type"));
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System.out.println(jsonObj.get("id"));
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//将用户id作为自定义属性加入到channel 中，方便随时channel中获取用户id
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AttributeKey<String> key = AttributeKey.valueOf("userId");
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ctx.channel().attr(key).setIfAbsent(id);
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//把用户信息添加到通道里
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ChannelSupervise.addChannel(ctx.channel(), id);
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}
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}
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// TextWebSocketFrame tws = new TextWebSocketFrame(new Date().toString()
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// + ctx.channel().id() + "：" + ctx.channel());
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// // 返回【谁发的发给谁】
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//
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// ctx.channel().writeAndFlush(tws);
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// 群发
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// ChannelSupervise.send2All(tws);
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}
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/**
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* 唯一的一次http请求，用于创建websocket
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*
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* @throws InterruptedException
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*/
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private void handleHttpRequest(final ChannelHandlerContext ctx,
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FullHttpRequest req) throws InterruptedException {
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//要求Upgrade为websocket，过滤掉get/Post
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if (!req.decoderResult().isSuccess() || (!"websocket".equals(req.headers().get("Upgrade")))) {
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//若不是websocket方式，则创建BAD_REQUEST的req，返回给客户端
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sendHttpResponse(ctx, req, new DefaultFullHttpResponse(HttpVersion.HTTP_1_1, HttpResponseStatus.BAD_REQUEST));
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return;
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}
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//握手
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WebSocketServerHandshakerFactory wsFactory = new WebSocketServerHandshakerFactory(
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"ws://localhost:2086/websocket", null, false);
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handshaker = wsFactory.newHandshaker(req);
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if (handshaker == null) {
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WebSocketServerHandshakerFactory
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.sendUnsupportedVersionResponse(ctx.channel());
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} else {
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handshaker.handshake(ctx.channel(), req);
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}
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}
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/**
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* 拒绝不合法的请求，并返回错误信息
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*/
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private static void sendHttpResponse(ChannelHandlerContext ctx,
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FullHttpRequest req, DefaultFullHttpResponse res) {
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// 返回应答给客户端
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if (res.status().code() != 200) {
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ByteBuf buf = Unpooled.copiedBuffer(res.status().toString(),
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CharsetUtil.UTF_8);
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res.content().writeBytes(buf);
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buf.release();
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}
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ChannelFuture f = ctx.channel().writeAndFlush(res);
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// 如果是非Keep-Alive，关闭连接
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// if (!isKeepAlive(req) || res.status().code() != 200) {
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// f.addListener(ChannelFutureListener.CLOSE);
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// }
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}
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@Override
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public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
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cause.printStackTrace();
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ctx.close();
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}
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/**
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* 删除用户与channel 对应关系
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*
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* @param ctx
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*/
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private void removeUserId(ChannelHandlerContext ctx) {
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AttributeKey<String> key = AttributeKey.valueOf("userId");
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String userId = ctx.channel().attr(key).get();
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NettyConfig.getUserChannelMap().remove(userId);
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}
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}
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