package com.xcong.farmer.cms.netty.handler;
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import com.xcong.farmer.cms.netty.common.ChannelManager;
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import com.xcong.farmer.cms.netty.common.Contans;
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import com.xcong.farmer.cms.netty.common.NettyTools;
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import com.xcong.farmer.cms.netty.dispatch.MsgDispatch;
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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.*;
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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.handler.timeout.IdleState;
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import io.netty.handler.timeout.IdleStateEvent;
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import io.netty.util.CharsetUtil;
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import lombok.extern.slf4j.Slf4j;
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import org.springframework.stereotype.Component;
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import javax.annotation.Resource;
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import java.net.InetAddress;
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import java.net.InetSocketAddress;
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import java.util.Date;
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import java.util.concurrent.ConcurrentHashMap;
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import java.util.concurrent.ConcurrentMap;
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import static io.netty.handler.codec.http.HttpUtil.isKeepAlive;
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/**
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* @author wzy
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* @email wangdoubleone@gmail.com
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* @date 2019-05-06
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*/
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@Slf4j
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@Component
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@ChannelHandler.Sharable
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public class WebSocketServerHandler extends ChannelInboundHandlerAdapter {
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private final ConcurrentMap<String, Integer> pingTimes = new ConcurrentHashMap<>();
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private static final int MAX_UN_REC_PING_TIMES = 3;
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private WebSocketServerHandshaker handshaker;
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@Resource(name = "msgDispatch")
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private MsgDispatch msgDispatch;
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@Override
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public void channelActive(ChannelHandlerContext ctx) throws Exception {
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log.info("[websocket客户端连入服务器]-->{}", ctx.channel().id());
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ChannelManager.addWebSocketChannel(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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log.info("[离开websocket服务器]-->{}", ctx.channel().id());
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ChannelManager.removeWebSocketChannel(ctx.channel());
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}
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@Override
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public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
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// LogUtil.info("[websocket服务器收到消息]-->{}, {}", ctx.channel().id(), msg);
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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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WebSocketFrame frame = (WebSocketFrame) msg;
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String content;
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try {
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content = ((TextWebSocketFrame) frame).text();
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if (content.contains(Contans.HEART_BEAT)) {
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resetTimes(ctx.channel());
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} else {
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this.msgDispatch.webSocketDispatch(ctx, content);
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}
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} catch (ClassCastException e) {
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content = ((CloseWebSocketFrame) frame).reasonText();
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ctx.writeAndFlush(new TextWebSocketFrame(content));
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}
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}
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}
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@Override
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public void userEventTriggered(ChannelHandlerContext ctx, Object evt) throws Exception {
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log.info("[触发器触发]");
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if (evt instanceof IdleStateEvent) {
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IdleStateEvent event = (IdleStateEvent) evt;
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if (event.state() == IdleState.READER_IDLE) {
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} else if (event.state() == IdleState.WRITER_IDLE) {
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/*写超时*/
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ctx.channel().writeAndFlush(NettyTools.webSocketBytes(Contans.HEART_BEAT));
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Integer times = pingTimes.get(ctx.channel().id().asShortText());
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if (times == null) {
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times = 0;
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}
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/*读超时*/
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log.info("===服务端===({}写超时, {})", ctx.channel().id().asShortText(), times);
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// 失败计数器次数大于等于3次的时候，关闭链接，等待client重连
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if (times >= MAX_UN_REC_PING_TIMES) {
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log.info("===服务端===(写超时，关闭chanel)");
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// 连续超过N次未收到client的ping消息，那么关闭该通道，等待client重连
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ctx.channel().close();
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} else {
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// 失败计数器加1
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times++;
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pingTimes.remove(ctx.channel().id().asShortText());
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pingTimes.put(ctx.channel().id().asShortText(), times);
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}
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} else if (event.state() == IdleState.ALL_IDLE) {
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/*总超时*/
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System.out.println("===服务端===(ALL_IDLE 总超时)");
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}
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}
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}
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private void resetTimes(Channel channel) {
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pingTimes.remove(channel.id().asShortText());
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pingTimes.put(channel.id().asShortText(), 0);
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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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log.error("[websocket服务器发生异常]-->{},{}#", ctx.channel().id(), cause);
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super.exceptionCaught(ctx, cause);
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}
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private void handlerWebSocketFrame(ChannelHandlerContext ctx, WebSocketFrame frame) {
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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(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("%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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TextWebSocketFrame tws = new TextWebSocketFrame(new Date().toString() + ctx.channel().id() + "：" + request);
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// 群发
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// ChannelSupervise.send2All(tws);
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// 返回【谁发的发给谁】
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// ctx.channel().writeAndFlush(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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private void handleHttpRequest(ChannelHandlerContext ctx, FullHttpRequest req) {
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InetSocketAddress inetSocketAddress = (InetSocketAddress) ctx.channel().remoteAddress();
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InetAddress inetAddress = inetSocketAddress.getAddress();
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String ip = inetAddress.getHostAddress();
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int port = inetSocketAddress.getPort();
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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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WebSocketServerHandshakerFactory wsFactory = new WebSocketServerHandshakerFactory("ws://" + ip + ":" + port + "/websocket", null, false);
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handshaker = wsFactory.newHandshaker(req);
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if (handshaker == null) {
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WebSocketServerHandshakerFactory.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, 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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//服务端向客户端发送数据
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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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}
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