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### websocket
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##### 1.基本用法
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> 以下代码展示的是每一个 websocket 客户端连接到服务端所拥有的功能
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- [相关代码位置](../app/service/websocket/ws.go)
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```code
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package websocket
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import (
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"fmt"
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"github.com/gin-gonic/gin"
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"github.com/gorilla/websocket"
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"go.uber.org/zap"
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"goskeleton/app/global/my_errors"
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"goskeleton/app/global/variable"
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"goskeleton/app/utils/websocket/core"
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)
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/**
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websocket模块相关事件执行顺序：
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1.onOpen
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2.OnMessage
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3.OnError
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4.OnClose
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*/
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type Ws struct {
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WsClient *core.Client
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}
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// onOpen 基本不需要做什么
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func (w *Ws) OnOpen(context *gin.Context) (*Ws, bool) {
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if client, ok := (&core.Client{}).OnOpen(context); ok {
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w.WsClient = client
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go w.WsClient.Heartbeat() // 一旦握手+协议升级成功，就为每一个连接开启一个自动化的隐式心跳检测包
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return w, true
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} else {
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return nil, false
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}
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}
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// OnMessage 处理业务消息
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func (w *Ws) OnMessage(context *gin.Context) {
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go w.WsClient.ReadPump(func(messageType int, receivedData []byte) {
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//参数说明
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//messageType 消息类型，1=文本
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//receivedData 服务器接收到客户端（例如js客户端）发来的的数据，[]byte 格式
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tempMsg := "服务器已经收到了你的消息==>" + string(receivedData)
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// 回复客户端已经收到消息;
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if err := w.WsClient.SendMessage(messageType, tempMsg); err != nil {
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variable.ZapLog.Error("消息发送出现错误", zap.Error(err))
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}
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}, w.OnError, w.OnClose)
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}
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// OnError 客户端与服务端在消息交互过程中发生错误回调函数
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func (w *Ws) OnError(err error) {
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w.WsClient.State = 0 // 发生错误，状态设置为0, 心跳检测协程则自动退出
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variable.ZapLog.Error("远端掉线、卡死、刷新浏览器等会触发该错误:", zap.Error(err))
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//fmt.Printf("远端掉线、卡死、刷新浏览器等会触发该错误: %v\n", err.Error())
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}
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// OnClose 客户端关闭回调，发生onError回调以后会继续回调该函数
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func (w *Ws) OnClose() {
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w.WsClient.Hub.UnRegister <- w.WsClient // 向hub管道投递一条注销消息，由hub中心负责关闭连接、删除在线数据
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}
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//获取在线的全部客户端
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func (w *Ws) GetOnlineClients() {
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fmt.Printf("在线客户端数量：%d\n", len(w.WsClient.Hub.Clients))
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}
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// (每一个客户端都有能力)向全部在线客户端广播消息
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func (w *Ws) BroadcastMsg(sendMsg string) {
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for onlineClient := range w.WsClient.Hub.Clients {
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//获取每一个在线的客户端，向远端发送消息
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if err := onlineClient.SendMessage(websocket.TextMessage, sendMsg); err != nil {
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variable.ZapLog.Error(my_errors.ErrorsWebsocketWriteMgsFail, zap.Error(err))
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}
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}
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}
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```
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##### 2.在本项目骨架任意位置，向所有在线的 websocet 客户端广播消息
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> 核心原理：每一个 websocket 客户端都有一个 Hub 结构体，而这个结构体是本项目骨架设置的全局值,因此在任意位置创建一个 websocket 客户端，只要将 Hub 值赋予全局初始化的：variable.WebsocketHub，就可以在任意位置进行广播消息.
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```code
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package demo1
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import (
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serviceWs "goskeleton/app/service/websocket"
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)
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// 省略其他无关代码，相关的核心代码如下
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if WsHub, ok := variable.WebsocketHub.(*core.Hub); ok {
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// serviceWs 为 app/service/websocket 的别名
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ws := serviceWs.Ws{WsClient: &core.Client{Hub: WsHub}}
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ws.BroadcastMsg("本项目骨架任意位置，使用本段代码对在线的 ws 客户端广播消息")
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}
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```
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