共计 4686 个字符，预计需要花费 12 分钟才能阅读完成。
依赖包
github.com/gin-gonic/gin
github.com/gorilla/websocket代码
创立 ws/ws.go
package ws
import (
"encoding/json"
"github.com/gin-gonic/gin"
"github.com/gorilla/websocket"
"log"
"net/http"
)
// ClientManager is a websocket manager
type ClientManager struct {Clients map[string]*Client
Broadcast chan []byte
Register chan *Client
Unregister chan *Client
}
// Client is a websocket client
type Client struct {
ID string
Socket *websocket.Conn
Send chan []byte}
// Message is return msg
type Message struct {
Sender string `json:"sender,omitempty"`
Recipient string `json:"recipient,omitempty"`
Content string `json:"content,omitempty"`
}
// Manager define a ws server manager
var Manager = ClientManager{Broadcast: make(chan []byte),
Register: make(chan *Client),
Unregister: make(chan *Client),
Clients: make(map[string]*Client),
}
// Start is 我的项目运行前, 协程开启 start -> go Manager.Start()
func (manager *ClientManager) Start() {
for {log.Println("<--- 管道通信 --->")
select {
case conn := <-Manager.Register:
log.Printf("新用户退出:%v", conn.ID)
Manager.Clients[conn.ID] = conn
jsonMessage, _ := json.Marshal(&Message{Content: "Successful connection to socket service"})
conn.Send <- jsonMessage
case conn := <-Manager.Unregister:
log.Printf("用户来到:%v", conn.ID)
if _, ok := Manager.Clients[conn.ID]; ok {jsonMessage, _ := json.Marshal(&Message{Content: "A socket has disconnected"})
conn.Send <- jsonMessage
close(conn.Send)
delete(Manager.Clients, conn.ID)
}
case message := <-Manager.Broadcast:
MessageStruct :=Message{}
json.Unmarshal(message, &MessageStruct)
for id, conn := range Manager.Clients {if id!=creatId(MessageStruct.Recipient,MessageStruct.Sender){continue}
select {
case conn.Send <- message:
default:
close(conn.Send)
delete(Manager.Clients, conn.ID)
}
}
}
}
}
func creatId(uid,touid string) string {return uid+"_"+touid}
func (c *Client) Read() {defer func() {
Manager.Unregister <- c
c.Socket.Close()}()
for {c.Socket.PongHandler()
_, message, err := c.Socket.ReadMessage()
if err != nil {
Manager.Unregister <- c
c.Socket.Close()
break
}
log.Printf("读取到客户端的信息:%s", string(message))
Manager.Broadcast <- message
}
}
func (c *Client) Write() {defer func() {c.Socket.Close()
}()
for {
select {
case message, ok := <-c.Send:
if !ok {c.Socket.WriteMessage(websocket.CloseMessage, []byte{})
return
}
log.Printf("发送到到客户端的信息:%s", string(message))
c.Socket.WriteMessage(websocket.TextMessage, message)
}
}
}
//TestHandler socket 连贯 中间件 作用: 降级协定, 用户验证, 自定义信息等
func WsHandler(c *gin.Context) {uid := c.Query("uid")
touid := c.Query("to_uid")
conn, err := (&websocket.Upgrader{CheckOrigin: func(r *http.Request) bool {return true}}).Upgrade(c.Writer, c.Request, nil)
if err != nil {http.NotFound(c.Writer, c.Request)
return
}
// 能够增加用户信息验证
client := &Client{ID: creatId(uid,touid),
Socket: conn,
Send: make(chan []byte),
}
Manager.Register <- client
go client.Read()
go client.Write()}
创立 main.go
package main
import (
"github.com/gin-gonic/gin"
"im/ws"
)
//server
func main() {gin.SetMode(gin.ReleaseMode) // 线上环境
go ws.Manager.Start()
r := gin.Default()
r.GET("/ws",ws.WsHandler)
r.GET("/pong", func(c *gin.Context) {
c.JSON(200, gin.H{"message": "pong",})
})
r.Run(":8282") // listen and serve on 0.0.0.0:8080
}运行服务端
go run mian.go创立 client.html
<html>
<head>
<title>Golang Chat</title>
<script src="http://libs.baidu.com/jquery/1.4.2/jquery.min.js"></script>
<meta charset="UTF-8" />
<script type="text/javascript">
$(function() {function getUrlParam(name)
{var reg = new RegExp("(^|&)"+ name +"=([^&]*)(&|$)"); // 结构一个含有指标参数的正则表达式对象
var r = window.location.search.substr(1).match(reg); // 匹配指标参数
if (r!=null) return unescape(r[2]); return null; // 返回参数值
}
var conn;
var msg = $("#msg");
var log = $("#log");
uid=getUrlParam("uid");
to_uid=getUrlParam("to_uid");
function appendLog(msg) {var d = log[0]
var doScroll = d.scrollTop == d.scrollHeight - d.clientHeight;
msg.appendTo(log)
if (doScroll) {d.scrollTop = d.scrollHeight - d.clientHeight;}
}
$("#form").submit(function() {if (!conn) {return false;}
if (!msg.val()) {return false;}
var json = {"sender":uid,"recipient":to_uid,"content":msg.val()}; // 创建对象；var jsonStr = JSON.stringify(json); // 转为 JSON 字符串
conn.send(jsonStr);
msg.val("");
return false
});
if (window["WebSocket"]) {conn = new WebSocket("ws://localhost:8282/ws?uid="+uid+"&to_uid="+to_uid);
conn.onclose = function(evt) {appendLog($("<div><b>Connection Closed.</b></div>"))
}
conn.onmessage = function(evt) {appendLog($("<div/>").text(evt.data))
}
} else {appendLog($("<div><b>WebSockets Not Support.</b></div>"))
}
});
</script>
<style type="text/css">
html {overflow: hidden;}
body {
overflow: hidden;
padding: 0;
margin: 0;
width: 100%;
height: 100%;
background: gray;
}
#log {
background: white;
margin: 0;
padding: 0.5em 0.5em 0.5em 0.5em;
position: absolute;
top: 0.5em;
left: 0.5em;
right: 0.5em;
bottom: 3em;
overflow: auto;
}
#form {
padding: 0 0.5em 0 0.5em;
margin: 0;
position: absolute;
bottom: 1em;
left: 0px;
width: 100%;
overflow: hidden;
}
</style>
</head>
<body>
<div id="log"></div>
<form id="form">
<input type="submit" value="发送" />
<input type="text" id="msg" size="64"/>
</form>
</body>
</html>本人搭建 nginx 或 apache 等 web 服务，别离在两个窗口运行
http://localhost/client.html?…
http://localhost/client.html?…
这样就能够聊天了
links
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