采用技術(shù)，Go、channel、協(xié)程、redis、websocket
package model

import (
"encoding/json"
"fmt"
"github.com/gorilla/websocket"
"gorm.io/gorm"
"net"
"net/http"
"strconv"
"sync"
)

//消息
type Message struct {
gorm.Model
FormId int64 //發(fā)送者
TargetId int64 //接收者
Type int //私聊、群聊、廣播 消息類型
Media int //消息類型 文字、圖片、音頻
Content string //消息內(nèi)容
Pic string
Url string
Desc string //描述
Amount int //數(shù)字統(tǒng)計(jì)
}

//人員關(guān)系
type Contact struct {
gorm.Model
OwnerId uint //誰的關(guān)系
TargetId uint //對應(yīng)的誰
Type int //關(guān)系類型
Desc string //描述
}

//群
type GroupBasic struct {
gorm.Model
Nmae string
OwnerId uint
Type int
Icon string //圖標(biāo)
Desc string
}

type Node struct {
Conn *websocket.Conn
DataQuene chan []byte
//GroupSets set.Interface
}

//映射關(guān)系
var clientMap map[int64]Node = make(map[int64]Node, 0)

//讀寫鎖
var rwLocker sync.RWMutex

func Chat(write http.ResponseWriter, request *http.Request) {

//校驗(yàn)Token
query := request.URL.Query()
Id := query.Get("userId")
//token := query.Get("token")
//targetId := query.Get("targetId")
userid, _ := strconv.ParseInt(Id, 10, 64)
//context := query.Get("context")
//msgtype := query.Get("type")
conn, err := (&websocket.Upgrader{
    CheckOrigin: func(r *http.Request) bool {
        return true
    },
}).Upgrade(write, request, nil)
if err != nil {
    fmt.Println(err)
    return
}
//獲取連接
node := &Node{
    Conn:      conn,
    DataQuene: make(chan []byte, 50),
}
//用戶關(guān)系

//userid與node綁定,并加鎖
rwLocker.Lock()
clientMap[userid] = node
rwLocker.Unlock()

//完成發(fā)送邏輯
go SendProc(node)
//完成接收邏輯
go WriteProc(node)
sendMsg(userid, []byte("歡迎進(jìn)入"))

}

func SendProc(node *Node) {
for {
select {
case data := <-node.DataQuene:
err := node.Conn.WriteMessage(websocket.TextMessage, data)
if err != nil {
fmt.Println(err)
return
}
}
}
}

func WriteProc(node *Node) {
for {
_, data, err := node.Conn.ReadMessage()
if err != nil {
fmt.Println(err)
return
}
broadMsg(data)
fmt.Println("[ws]------", data)
}
}

var udpsendChan chan []byte = make(chan []byte, 1024)

func broadMsg(data []byte) {
//把要發(fā)送的消息放進(jìn)通道里面
udpsendChan <- data
}

func init() {
go udpSendProc()
go udpWriteProc()
}

//完成數(shù)據(jù)udp的發(fā)送協(xié)程
func udpSendProc() {
con, err := net.DialUDP("udp", nil, &net.UDPAddr{
IP: net.IPv4(10, 102, 0, 255),
Port: 3000,
})
defer con.Close()
if err != nil {
fmt.Println(err)
return
}
for {
select {
case data := <-udpsendChan:
_, err = con.Write(data)
if err != nil {
fmt.Println(err)
return
}
}
}
}

//完成udp數(shù)據(jù)接收協(xié)程
func udpWriteProc() {
con, err := net.ListenUDP("udp", &net.UDPAddr{
IP: net.IPv4zero,
Port: 3000,
})
if err != nil {
fmt.Println(err)
return
}
defer con.Close()
for {
var buf [512]byte
n, err := con.Read(buf[0:])
if err != nil {
fmt.Println(err)
return
}
dispatch(buf[0:n])
}
}

//后端調(diào)度邏輯處理
func dispatch(data []byte) {
msg := Message{}
err := json.Unmarshal(data, &msg)
if err != nil {
fmt.Println(err)
return
}
switch msg.Type {
case 1: //私信
sendMsg(msg.TargetId, data)
//case 2://群發(fā)
// sendGroupMsg()
//case 3:
// sendAllMsg()
//case 4:

}

}
func sendMsg(userId int64, msg []byte) {
//上鎖
rwLocker.RLock()
node, ok := clientMap[userId]
//解鎖
rwLocker.RUnlock()
if ok {
node.DataQuene <- msg
}
}