499 lines
14 KiB
Go
499 lines
14 KiB
Go
package logic
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//websocket连接
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import (
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"bytes"
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"encoding/hex"
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"encoding/json"
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"errors"
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"fmt"
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"fusenapi/constants"
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"fusenapi/utils/auth"
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"fusenapi/utils/basic"
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"fusenapi/utils/encryption_decryption"
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"fusenapi/utils/websocket_data"
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"net/http"
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"strings"
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"sync"
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"time"
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"github.com/google/uuid"
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"github.com/gorilla/websocket"
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"context"
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"fusenapi/server/websocket/internal/svc"
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"github.com/zeromicro/go-zero/core/logx"
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)
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type DataTransferLogic struct {
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logx.Logger
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ctx context.Context
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svcCtx *svc.ServiceContext
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}
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func NewDataTransferLogic(ctx context.Context, svcCtx *svc.ServiceContext) *DataTransferLogic {
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return &DataTransferLogic{
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Logger: logx.WithContext(ctx),
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ctx: ctx,
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svcCtx: svcCtx,
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}
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}
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var (
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//临时对象缓存池
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buffPool = sync.Pool{
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New: func() interface{} {
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return bytes.Buffer{}
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},
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}
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//升级websocket
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upgrader = websocket.Upgrader{
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//最大可读取大小 1M
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ReadBufferSize: 1024,
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//最大可写大小 1M
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WriteBufferSize: 1024,
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//握手超时时间15s
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HandshakeTimeout: time.Second * 15,
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//允许跨域
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CheckOrigin: func(r *http.Request) bool {
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return true
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},
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//写的缓冲队列
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WriteBufferPool: &buffPool,
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//是否支持压缩
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EnableCompression: true,
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}
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//websocket连接存储
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mapConnPool = sync.Map{}
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//每个websocket连接入口缓冲队列长度默认值
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websocketInChanLen = 2000
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//每个websocket连接出口缓冲队列长度默认值
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websocketOutChanLen = 2000
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//是否开启debug
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openDebug = true
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//允许跨域的origin
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mapAllowOrigin = map[string]struct{}{
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"https://www.fusen.3718.cn": struct{}{},
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"http://www.fusen.3718.cn": struct{}{},
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}
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)
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// 用户标识的连接增删操作队列传输的值的结构
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type userConnPoolCtlChanItem struct {
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userId int64 //必须（两个用户id任意一个不为0）
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guestId int64 //必须（两个用户id任意一个不为0）
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uniqueId string //主连接池唯一标识（添加/删除时候必须）
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message []byte //消息（发送消息传的,格式是经过标准输出序列化后的数据）
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//messageType constants.Websocket //消息类型（发送消息传的）
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option int64 //操作 2发消息 1增加 0删除
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}
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// 每个连接的连接基本属性
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type wsConnectItem struct {
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conn *websocket.Conn //websocket的连接(基本属性)
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userAgent string //用户代理头信息(基本属性，用于重连标识验证因素之一)
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logic *DataTransferLogic //logic(基本属性，用于获取上下文，配置或者操作数据库)
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closeChan chan struct{} //ws连接关闭chan(基本属性)
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isClose bool //是否已经关闭(基本属性)
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uniqueId string //ws连接唯一标识(基本属性)
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inChan chan []byte //接受消息缓冲队列(基本属性)
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outChan chan []byte //要发送回客户端的消息缓冲队列(基本属性)
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mutex sync.Mutex //互斥锁(基本属性)
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userId int64 //用户id(基本属性)
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guestId int64 //游客id(基本属性)
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extendRenderProperty extendRenderProperty //扩展云渲染属性(扩展属性)
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}
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// 请求建立连接，升级websocket协议
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func (l *DataTransferLogic) DataTransfer(w http.ResponseWriter, r *http.Request) {
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origin := r.Header.Get("Origin")
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//判断是不是允许的跨域
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if !openDebug {
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upgrader.CheckOrigin = func(r *http.Request) bool {
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if _, ok := mapAllowOrigin[origin]; !ok {
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return false
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}
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return true
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}
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}
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//把子协议携带的token设置到标准token头信息中
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secWebsocketProtocol := r.Header.Get("Sec-Websocket-Protocol")
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oldWid := ""
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//有token是正常用户，无则是白板用户，也可以连接
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if secWebsocketProtocol != "" {
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s := strings.Split(secWebsocketProtocol, ",")
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if len(s) != 2 {
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w.Write([]byte("invalid secWebsocketProtocol param"))
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return
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}
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//有效token
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if s[0] != "empty_token" {
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r.Header.Set("Authorization", "Bearer "+s[0])
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}
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//有效wid
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if s[1] != "empty_wid" {
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oldWid = s[1]
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}
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//设置Sec-Websocket-Protocol
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upgrader.Subprotocols = []string{secWebsocketProtocol}
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}
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//判断下是否火狐浏览器(获取浏览器第一条消息返回有收不到的bug需要延迟1秒)
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userAgent := r.Header.Get("User-Agent")
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//是否火狐浏览器
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isFirefoxBrowser := false
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if strings.Contains(userAgent, "Firefox") {
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isFirefoxBrowser = true
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}
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//升级websocket
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conn, err := upgrader.Upgrade(w, r, nil)
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if err != nil {
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logx.Error("http upgrade websocket err:", err)
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return
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}
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//支持写压缩
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conn.EnableWriteCompression(true)
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//鉴权不成功后断开
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var (
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userInfo *auth.UserInfo
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isAuth bool
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)
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isAuth, userInfo = l.checkAuth(r)
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if !isAuth {
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//未授权响应消息
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l.unAuthResponse(conn, isFirefoxBrowser)
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conn.Close()
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return
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}
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//设置连接
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ws, err := l.setConnPool(conn, userInfo, isFirefoxBrowser, userAgent, oldWid)
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if err != nil {
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conn.Close()
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return
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}
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//循环读客户端信息
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go ws.reciveBrowserMessage()
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//消费出口数据并发送浏览器端
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go ws.consumeOutChanData()
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//消费入口数据
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go ws.consumeInChanData()
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//消费渲染缓冲队列
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go ws.consumeRenderImageData()
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//心跳
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ws.heartbeat()
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}
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// 设置连接
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func (l *DataTransferLogic) setConnPool(conn *websocket.Conn, userInfo *auth.UserInfo, isFirefoxBrowser bool, userAgent, oldWid string) (wsConnectItem, error) {
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//生成连接唯一标识（失败重试10次）
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uniqueId, err := l.getUniqueId(userInfo, userAgent, 10)
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if err != nil {
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//发送获取唯一标识失败的消息
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l.sendGetUniqueIdErrResponse(conn)
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return wsConnectItem{}, err
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}
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if oldWid != "" {
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//解析传入的wid是不是属于自己的用户的
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decryptionWid, err := encryption_decryption.CBCDecrypt(oldWid)
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if err != nil {
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logx.Error(err)
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return wsConnectItem{}, errors.New("解码wid失败")
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}
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lendecryptionWid := len(decryptionWid)
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//合成client后缀,不是同个后缀的不能复用
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userPart := getUserJoinPart(userInfo.UserId, userInfo.GuestId, userAgent)
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lenUserPart := len(userPart)
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canUseOldWid := true
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//长度太短
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if lendecryptionWid <= lenUserPart {
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logx.Info("复用的连接标识太短，不符合重用条件")
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canUseOldWid = false
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}
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//尾部不同不能复用
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if decryptionWid[lendecryptionWid-lenUserPart:] != userPart {
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logx.Info("尾部用户信息不同，不符合重用条件")
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canUseOldWid = false
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}
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//存在是不能给他申请重新绑定
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if _, ok := mapConnPool.Load(oldWid); ok {
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logx.Info("复用的连接标识已被其他客户端使用，不符合重用条件")
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canUseOldWid = false
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}
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//检测通过可以用旧的
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if canUseOldWid {
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logx.Info("====复用旧的ws连接成功====")
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uniqueId = oldWid
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}
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}
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renderCtx, renderCtxCancelFunc := context.WithCancel(l.ctx)
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ws := wsConnectItem{
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conn: conn,
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userAgent: userAgent,
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logic: l,
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closeChan: make(chan struct{}, 1),
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isClose: false,
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uniqueId: uniqueId,
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inChan: make(chan []byte, websocketInChanLen),
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outChan: make(chan []byte, websocketOutChanLen),
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mutex: sync.Mutex{},
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userId: userInfo.UserId,
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guestId: userInfo.GuestId,
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extendRenderProperty: extendRenderProperty{
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renderChan: make(chan websocket_data.RenderImageReqMsg, renderChanLen),
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renderCtx: renderCtx,
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renderCtxCancelFunc: renderCtxCancelFunc,
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},
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}
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//保存连接
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mapConnPool.Store(uniqueId, ws)
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//非白板用户，需要为这个用户建立map索引便于通过用户查询
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createUserConnPoolElement(userInfo.UserId, userInfo.GuestId, uniqueId)
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if isFirefoxBrowser {
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time.Sleep(time.Second * 1) //兼容下火狐(直接发回去收不到第一条消息：有待研究)
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}
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ws.sendToOutChan(ws.respondDataFormat(constants.WEBSOCKET_CONNECT_SUCCESS, uniqueId))
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//发送累加统计连接书
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increaseWebsocketConnectCount()
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return ws, nil
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}
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// 获取websocket发送到前端使用的数据传输类型（debug开启是文本，否则是二进制）
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func getWebsocketBaseTransferDataFormat() int {
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if openDebug {
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return websocket.TextMessage
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}
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return websocket.BinaryMessage
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}
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// 获取唯一id
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func (l *DataTransferLogic) getUniqueId(userInfo *auth.UserInfo, userAgent string, retryTimes int) (uniqueId string, err error) {
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if retryTimes < 0 {
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return "", errors.New("failed to get unique id")
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}
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//后面拼接上用户id
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uniqueId = hex.EncodeToString([]byte(uuid.New().String())) + getUserJoinPart(userInfo.UserId, userInfo.GuestId, userAgent)
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//存在则从新获取
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if _, ok := mapConnPool.Load(uniqueId); ok {
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uniqueId, err = l.getUniqueId(userInfo, userAgent, retryTimes-1)
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if err != nil {
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return "", err
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}
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}
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//加密
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uniqueId, err = encryption_decryption.CBCEncrypt(uniqueId)
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if err != nil {
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return "", err
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}
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return uniqueId, nil
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}
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// 鉴权
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func (l *DataTransferLogic) checkAuth(r *http.Request) (isAuth bool, userInfo *auth.UserInfo) {
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// 解析JWT token,并对空用户进行判断
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userInfo, err := basic.ParseJwtToken(r, l.svcCtx)
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if err != nil {
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return false, nil
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}
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if userInfo.UserId > 0 {
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userInfo.GuestId = 0
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}
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//白板用户
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return true, userInfo
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}
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// 鉴权失败通知
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func (l *DataTransferLogic) unAuthResponse(conn *websocket.Conn, isFirefoxBrowser bool) {
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rsp := websocket_data.DataTransferData{
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T: constants.WEBSOCKET_UNAUTH,
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D: nil,
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}
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b, _ := json.Marshal(rsp)
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if isFirefoxBrowser {
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time.Sleep(time.Second * 1) //兼容下火狐(直接发回去收不到第一条消息：有待研究)
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}
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//先发一条正常信息
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_ = conn.WriteMessage(getWebsocketBaseTransferDataFormat(), b)
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//发送关闭信息
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_ = conn.WriteMessage(websocket.CloseMessage, nil)
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}
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// 获取唯一标识失败通知
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func (l *DataTransferLogic) sendGetUniqueIdErrResponse(conn *websocket.Conn) {
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time.Sleep(time.Second * 1) //兼容下火狐(直接发回去收不到第一条消息：有待研究)
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rsp := websocket_data.DataTransferData{
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T: constants.WEBSOCKET_CONNECT_ERR,
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D: "err to gen unique id ",
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}
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b, _ := json.Marshal(rsp)
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//先发一条正常信息
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_ = conn.WriteMessage(getWebsocketBaseTransferDataFormat(), b)
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//发送关闭信息
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_ = conn.WriteMessage(websocket.CloseMessage, nil)
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}
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// 心跳检测
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func (w *wsConnectItem) heartbeat() {
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tick := time.Tick(time.Second * 5)
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for {
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select {
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case <-w.closeChan:
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return
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case <-tick:
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//发送心跳信息
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if err := w.conn.WriteMessage(websocket.PongMessage, nil); err != nil {
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logx.Error("发送心跳信息异常，关闭连接:", w.uniqueId, err)
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w.close()
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return
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}
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}
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}
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}
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// 关闭websocket连接
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func (w *wsConnectItem) close() {
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w.mutex.Lock()
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defer w.mutex.Unlock()
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logx.Info("###websocket:", w.uniqueId, " uid:", w.userId, " gid:", w.guestId, " is closing....")
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//发送关闭信息
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_ = w.conn.WriteMessage(websocket.CloseMessage, nil)
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w.conn.Close()
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mapConnPool.Delete(w.uniqueId)
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if !w.isClose {
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w.isClose = true
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close(w.closeChan)
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//删除用户级索引
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deleteUserConnPoolElement(w.userId, w.guestId, w.uniqueId)
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//减少连接数统计
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decreaseWebsocketConnectCount()
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}
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logx.Info("###websocket:", w.uniqueId, " uid:", w.userId, " gid:", w.guestId, " is closed")
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}
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// 读取出口缓冲队列数据输出返回给浏览器端
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func (w *wsConnectItem) consumeOutChanData() {
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defer func() {
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if err := recover(); err != nil {
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logx.Error("consumeOutChanData panic:", err)
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}
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}()
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for {
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select {
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case <-w.closeChan: //如果关闭了
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return
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case data := <-w.outChan:
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if err := w.conn.WriteMessage(websocket.TextMessage, data); err != nil {
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logx.Error("websocket write loop err:", err)
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w.close()
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return
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}
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}
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}
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}
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// 消费websocket入口数据池中的数据
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func (w *wsConnectItem) consumeInChanData() {
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defer func() {
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if err := recover(); err != nil {
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logx.Error("consumeInChanData:", err)
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}
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}()
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for {
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select {
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case <-w.closeChan:
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return
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case data := <-w.inChan:
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//对不同消息类型分发处理
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w.allocationProcessing(data)
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}
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}
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}
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// 接受浏览器端发来的消息并写入入口缓冲队列
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func (w *wsConnectItem) reciveBrowserMessage() {
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defer func() {
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if err := recover(); err != nil {
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logx.Error("acceptBrowserMessage panic:", err)
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}
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}()
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for {
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select {
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case <-w.closeChan: //如果关闭了
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return
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default: //收取消息
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msgType, data, err := w.conn.ReadMessage()
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if err != nil {
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logx.Error("接受信息错误:", err)
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//关闭连接
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w.close()
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return
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}
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switch msgType {
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case websocket.PingMessage, websocket.PongMessage: //心跳消息(过滤不处理)
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continue
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case websocket.BinaryMessage, websocket.TextMessage: //主要消息
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w.sendToInChan(data)
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case websocket.CloseMessage: //客户端主动关闭消息
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w.close()
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}
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}
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}
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}
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// 把要传递给客户端的数据放入出口缓冲队列
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func (w *wsConnectItem) sendToOutChan(data []byte) {
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select {
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case <-w.closeChan:
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return
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case w.outChan <- data:
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return
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}
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}
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// 发送接受到的消息到入口缓冲队列中
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func (w *wsConnectItem) sendToInChan(data []byte) {
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select {
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case <-w.closeChan: //关闭了
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return
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case w.inChan <- data:
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return
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}
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}
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// 格式化为websocket标准返回格式
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func (w *wsConnectItem) respondDataFormat(msgType constants.Websocket, data interface{}) []byte {
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d := websocket_data.DataTransferData{
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T: msgType,
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D: data,
|
||
}
|
||
b, _ := json.Marshal(d)
|
||
return b
|
||
}
|
||
|
||
// 获取用户拼接部分(复用标识用到)
|
||
func getUserJoinPart(userId, guestId int64, userAgent string) string {
|
||
if userId > 0 {
|
||
guestId = 0
|
||
}
|
||
return fmt.Sprintf("|_%d_%d_|_%s_|", userId, guestId, userAgent)
|
||
}
|
||
|
||
// 处理入口缓冲队列中不同类型的数据（分发处理）
|
||
func (w *wsConnectItem) allocationProcessing(data []byte) {
|
||
var parseInfo websocket_data.DataTransferData
|
||
if err := json.Unmarshal(data, &parseInfo); err != nil {
|
||
w.incomeDataFormatErrResponse("invalid format of income message:" + string(data))
|
||
logx.Error("invalid format of websocket message:", err)
|
||
return
|
||
}
|
||
d, _ := json.Marshal(parseInfo.D)
|
||
//获取工厂实例
|
||
processor := w.newAllocationProcessor(parseInfo.T)
|
||
if processor == nil {
|
||
logx.Error("未知消息类型:", string(data))
|
||
return
|
||
}
|
||
//执行工厂方法
|
||
processor.allocationMessage(w, d)
|
||
}
|