452 lines
13 KiB
Go
452 lines
13 KiB
Go
package logic
|
||
|
||
//websocket连接
|
||
import (
|
||
"bytes"
|
||
"encoding/hex"
|
||
"encoding/json"
|
||
"errors"
|
||
"fusenapi/constants"
|
||
"fusenapi/utils/auth"
|
||
"fusenapi/utils/basic"
|
||
"fusenapi/utils/encryption_decryption"
|
||
"fusenapi/utils/websocket_data"
|
||
"net/http"
|
||
"strings"
|
||
"sync"
|
||
"time"
|
||
|
||
"github.com/google/uuid"
|
||
"github.com/gorilla/websocket"
|
||
|
||
"context"
|
||
|
||
"fusenapi/server/websocket/internal/svc"
|
||
|
||
"github.com/zeromicro/go-zero/core/logx"
|
||
)
|
||
|
||
type DataTransferLogic struct {
|
||
logx.Logger
|
||
ctx context.Context
|
||
svcCtx *svc.ServiceContext
|
||
}
|
||
|
||
func NewDataTransferLogic(ctx context.Context, svcCtx *svc.ServiceContext) *DataTransferLogic {
|
||
return &DataTransferLogic{
|
||
Logger: logx.WithContext(ctx),
|
||
ctx: ctx,
|
||
svcCtx: svcCtx,
|
||
}
|
||
}
|
||
|
||
var (
|
||
//临时对象缓存池
|
||
buffPool = sync.Pool{
|
||
New: func() interface{} {
|
||
return bytes.Buffer{}
|
||
},
|
||
}
|
||
//升级websocket
|
||
upgrader = websocket.Upgrader{
|
||
//最大可读取大小 1M
|
||
ReadBufferSize: 1024,
|
||
//最大可写大小 1M
|
||
WriteBufferSize: 1024,
|
||
//握手超时时间15s
|
||
HandshakeTimeout: time.Second * 15,
|
||
//允许跨域
|
||
CheckOrigin: func(r *http.Request) bool {
|
||
return true
|
||
},
|
||
//写的缓冲队列
|
||
WriteBufferPool: &buffPool,
|
||
//是否支持压缩
|
||
EnableCompression: true,
|
||
}
|
||
//websocket连接存储
|
||
mapConnPool = sync.Map{}
|
||
//每个websocket连接入口缓冲队列长度默认值
|
||
websocketInChanLen = 500
|
||
//每个websocket连接出口缓冲队列长度默认值
|
||
websocketOutChanLen = 500
|
||
//是否开启debug
|
||
openDebug = true
|
||
//允许跨域的origin
|
||
mapAllowOrigin = map[string]struct{}{
|
||
"https://www.fusen.3718.cn": struct{}{},
|
||
"http://www.fusen.3718.cn": struct{}{},
|
||
}
|
||
)
|
||
|
||
// 用户标识的连接增删操作队列传输的值的结构
|
||
type userConnPoolCtlChanItem struct {
|
||
userId int64 //必须（两个用户id任意一个不为0）
|
||
guestId int64 //必须（两个用户id任意一个不为0）
|
||
uniqueId string //主连接池唯一标识（添加/删除时候必须）
|
||
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）
|
||
messageType constants.Websocket //消息类型（发送消息传的）
|
||
option int64 //操作 2发消息 1增加 0删除
|
||
}
|
||
|
||
// 每个连接的连接基本属性
|
||
type wsConnectItem struct {
|
||
conn *websocket.Conn //websocket的连接(基本属性)
|
||
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)
|
||
logic *DataTransferLogic //logic(基本属性，用于获取上下文，配置或者操作数据库)
|
||
closeChan chan struct{} //ws连接关闭chan(基本属性)
|
||
isClose bool //是否已经关闭(基本属性)
|
||
uniqueId string //ws连接唯一标识(基本属性)
|
||
inChan chan []byte //接受消息缓冲队列(基本属性)
|
||
outChan chan []byte //要发送回客户端的消息缓冲队列(基本属性)
|
||
mutex sync.Mutex //互斥锁(基本属性)
|
||
userId int64 //用户id(基本属性)
|
||
guestId int64 //游客id(基本属性)
|
||
extendRenderProperty extendRenderProperty //扩展云渲染属性(扩展属性)
|
||
}
|
||
|
||
// 请求建立连接，升级websocket协议
|
||
func (l *DataTransferLogic) DataTransfer(w http.ResponseWriter, r *http.Request) {
|
||
origin := r.Header.Get("Origin")
|
||
//判断是不是允许的跨域
|
||
if !openDebug {
|
||
upgrader.CheckOrigin = func(r *http.Request) bool {
|
||
if _, ok := mapAllowOrigin[origin]; !ok {
|
||
return false
|
||
}
|
||
return true
|
||
}
|
||
}
|
||
//把子协议携带的token设置到标准token头信息中
|
||
token := r.Header.Get("Sec-Websocket-Protocol")
|
||
//有token是正常用户，无则是白板用户，也可以连接
|
||
if token != "" {
|
||
r.Header.Set("Authorization", "Bearer "+token)
|
||
//设置Sec-Websocket-Protocol
|
||
upgrader.Subprotocols = []string{token}
|
||
}
|
||
//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)
|
||
userAgent := r.Header.Get("User-Agent")
|
||
//是否火狐浏览器
|
||
isFirefoxBrowser := false
|
||
if strings.Contains(userAgent, "Firefox") {
|
||
isFirefoxBrowser = true
|
||
}
|
||
//升级websocket
|
||
conn, err := upgrader.Upgrade(w, r, nil)
|
||
if err != nil {
|
||
logx.Error("http upgrade websocket err:", err)
|
||
return
|
||
}
|
||
//支持写压缩
|
||
conn.EnableWriteCompression(true)
|
||
//鉴权不成功后断开
|
||
var (
|
||
userInfo *auth.UserInfo
|
||
isAuth bool
|
||
)
|
||
isAuth, userInfo = l.checkAuth(r)
|
||
if !isAuth {
|
||
//未授权响应消息
|
||
l.unAuthResponse(conn, isFirefoxBrowser)
|
||
conn.Close()
|
||
return
|
||
}
|
||
//设置连接
|
||
ws, err := l.setConnPool(conn, userInfo, isFirefoxBrowser, userAgent)
|
||
if err != nil {
|
||
conn.Close()
|
||
return
|
||
}
|
||
//循环读客户端信息
|
||
go ws.reciveBrowserMessage()
|
||
//消费出口数据并发送浏览器端
|
||
go ws.consumeOutChanData()
|
||
//消费入口数据
|
||
go ws.consumeInChanData()
|
||
//操作连接中渲染任务的增加/删除
|
||
go ws.operationRenderTask()
|
||
//消费渲染缓冲队列
|
||
go ws.consumeRenderImageData()
|
||
//心跳
|
||
ws.heartbeat()
|
||
}
|
||
|
||
// 设置连接
|
||
func (l *DataTransferLogic) setConnPool(conn *websocket.Conn, userInfo *auth.UserInfo, isFirefoxBrowser bool, userAgent string) (wsConnectItem, error) {
|
||
//生成连接唯一标识（失败重试10次）
|
||
uniqueId, err := l.getUniqueId(userInfo, userAgent, 10)
|
||
if err != nil {
|
||
//发送获取唯一标识失败的消息
|
||
l.sendGetUniqueIdErrResponse(conn)
|
||
return wsConnectItem{}, err
|
||
}
|
||
ws := wsConnectItem{
|
||
conn: conn,
|
||
userAgent: userAgent,
|
||
logic: l,
|
||
closeChan: make(chan struct{}, 1),
|
||
isClose: false,
|
||
uniqueId: uniqueId,
|
||
inChan: make(chan []byte, websocketInChanLen),
|
||
outChan: make(chan []byte, websocketOutChanLen),
|
||
mutex: sync.Mutex{},
|
||
userId: userInfo.UserId,
|
||
guestId: userInfo.GuestId,
|
||
extendRenderProperty: extendRenderProperty{
|
||
renderImageTask: make(map[string]*renderTask),
|
||
renderImageTaskCtlChan: make(chan renderImageControlChanItem, renderImageTaskCtlChanLen),
|
||
renderChan: make(chan []byte, renderChanLen),
|
||
renderConsumeTickTime: 1, //默认1纳秒，后面需要根据不同用户不同触发速度
|
||
},
|
||
}
|
||
//保存连接
|
||
mapConnPool.Store(uniqueId, ws)
|
||
//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
|
||
createUserConnPoolElement(userInfo.UserId, userInfo.GuestId, uniqueId)
|
||
if isFirefoxBrowser {
|
||
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)
|
||
}
|
||
ws.sendToOutChan(ws.respondDataFormat(constants.WEBSOCKET_CONNECT_SUCCESS, uniqueId))
|
||
//发送累加统计连接书
|
||
increaseWebsocketConnectCount()
|
||
return ws, nil
|
||
}
|
||
|
||
// 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）
|
||
func getWebsocketBaseTransferDataFormat() int {
|
||
if openDebug {
|
||
return websocket.TextMessage
|
||
}
|
||
return websocket.BinaryMessage
|
||
}
|
||
|
||
// 获取唯一id
|
||
func (l *DataTransferLogic) getUniqueId(userInfo *auth.UserInfo, userAgent string, retryTimes int) (uniqueId string, err error) {
|
||
if retryTimes < 0 {
|
||
return "", errors.New("failed to get unique id")
|
||
}
|
||
//后面拼接上用户id
|
||
uniqueId = hex.EncodeToString([]byte(uuid.New().String())) + getUserJoinPart(userInfo.UserId, userInfo.GuestId, userAgent)
|
||
//存在则从新获取
|
||
if _, ok := mapConnPool.Load(uniqueId); ok {
|
||
uniqueId, err = l.getUniqueId(userInfo, userAgent, retryTimes-1)
|
||
if err != nil {
|
||
return "", err
|
||
}
|
||
}
|
||
//加密
|
||
uniqueId, err = encryption_decryption.CBCEncrypt(uniqueId)
|
||
if err != nil {
|
||
return "", err
|
||
}
|
||
return uniqueId, nil
|
||
}
|
||
|
||
// 鉴权
|
||
func (l *DataTransferLogic) checkAuth(r *http.Request) (isAuth bool, userInfo *auth.UserInfo) {
|
||
// 解析JWT token,并对空用户进行判断
|
||
userInfo, err := basic.ParseJwtToken(r, l.svcCtx)
|
||
if err != nil {
|
||
return false, nil
|
||
}
|
||
if userInfo.UserId > 0 {
|
||
userInfo.GuestId = 0
|
||
}
|
||
//白板用户
|
||
return true, userInfo
|
||
}
|
||
|
||
// 鉴权失败通知
|
||
func (l *DataTransferLogic) unAuthResponse(conn *websocket.Conn, isFirefoxBrowser bool) {
|
||
rsp := websocket_data.DataTransferData{
|
||
T: constants.WEBSOCKET_UNAUTH,
|
||
D: nil,
|
||
}
|
||
b, _ := json.Marshal(rsp)
|
||
if isFirefoxBrowser {
|
||
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)
|
||
}
|
||
//先发一条正常信息
|
||
_ = conn.WriteMessage(getWebsocketBaseTransferDataFormat(), b)
|
||
//发送关闭信息
|
||
_ = conn.WriteMessage(websocket.CloseMessage, nil)
|
||
}
|
||
|
||
// 获取唯一标识失败通知
|
||
func (l *DataTransferLogic) sendGetUniqueIdErrResponse(conn *websocket.Conn) {
|
||
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)
|
||
rsp := websocket_data.DataTransferData{
|
||
T: constants.WEBSOCKET_CONNECT_ERR,
|
||
D: "err to gen unique id ",
|
||
}
|
||
b, _ := json.Marshal(rsp)
|
||
//先发一条正常信息
|
||
_ = conn.WriteMessage(getWebsocketBaseTransferDataFormat(), b)
|
||
//发送关闭信息
|
||
_ = conn.WriteMessage(websocket.CloseMessage, nil)
|
||
}
|
||
|
||
// 心跳检测
|
||
func (w *wsConnectItem) heartbeat() {
|
||
tick := time.Tick(time.Second * 5)
|
||
for {
|
||
select {
|
||
case <-w.closeChan:
|
||
return
|
||
case <-tick:
|
||
//发送心跳信息
|
||
if err := w.conn.WriteMessage(websocket.PongMessage, nil); err != nil {
|
||
logx.Error("发送心跳信息异常，关闭连接:", w.uniqueId, err)
|
||
w.close()
|
||
return
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
// 关闭websocket连接
|
||
func (w *wsConnectItem) close() {
|
||
w.mutex.Lock()
|
||
defer w.mutex.Unlock()
|
||
logx.Info("###websocket:", w.uniqueId, " uid:", w.userId, " gid:", w.guestId, " is closing....")
|
||
//发送关闭信息
|
||
_ = w.conn.WriteMessage(websocket.CloseMessage, nil)
|
||
w.conn.Close()
|
||
mapConnPool.Delete(w.uniqueId)
|
||
if !w.isClose {
|
||
w.isClose = true
|
||
close(w.closeChan)
|
||
//删除用户级索引
|
||
deleteUserConnPoolElement(w.userId, w.guestId, w.uniqueId)
|
||
//减少连接数统计
|
||
decreaseWebsocketConnectCount()
|
||
}
|
||
logx.Info("###websocket:", w.uniqueId, " uid:", w.userId, " gid:", w.guestId, " is closed")
|
||
}
|
||
|
||
// 读取出口缓冲队列数据输出返回给浏览器端
|
||
func (w *wsConnectItem) consumeOutChanData() {
|
||
defer func() {
|
||
if err := recover(); err != nil {
|
||
logx.Error("consumeOutChanData panic:", err)
|
||
}
|
||
}()
|
||
for {
|
||
select {
|
||
case <-w.closeChan: //如果关闭了
|
||
return
|
||
case data := <-w.outChan:
|
||
if err := w.conn.WriteMessage(websocket.TextMessage, data); err != nil {
|
||
logx.Error("websocket write loop err:", err)
|
||
w.close()
|
||
return
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
// 消费websocket入口数据池中的数据
|
||
func (w *wsConnectItem) consumeInChanData() {
|
||
defer func() {
|
||
if err := recover(); err != nil {
|
||
logx.Error("consumeInChanData:", err)
|
||
}
|
||
}()
|
||
for {
|
||
select {
|
||
case <-w.closeChan:
|
||
return
|
||
case data := <-w.inChan:
|
||
//对不同消息类型分发处理
|
||
w.allocationProcessing(data)
|
||
}
|
||
}
|
||
}
|
||
|
||
// 接受浏览器端发来的消息并写入入口缓冲队列
|
||
func (w *wsConnectItem) reciveBrowserMessage() {
|
||
defer func() {
|
||
if err := recover(); err != nil {
|
||
logx.Error("acceptBrowserMessage panic:", err)
|
||
}
|
||
}()
|
||
for {
|
||
select {
|
||
case <-w.closeChan: //如果关闭了
|
||
return
|
||
default: //收取消息
|
||
msgType, data, err := w.conn.ReadMessage()
|
||
if err != nil {
|
||
logx.Error("接受信息错误:", err)
|
||
//关闭连接
|
||
w.close()
|
||
return
|
||
}
|
||
switch msgType {
|
||
case websocket.PingMessage, websocket.PongMessage: //心跳消息(过滤不处理)
|
||
continue
|
||
case websocket.BinaryMessage, websocket.TextMessage: //主要消息
|
||
w.sendToInChan(data)
|
||
case websocket.CloseMessage: //客户端主动关闭消息
|
||
w.close()
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
// 把要传递给客户端的数据放入出口缓冲队列
|
||
func (w *wsConnectItem) sendToOutChan(data []byte) {
|
||
select {
|
||
case <-w.closeChan:
|
||
return
|
||
case w.outChan <- data:
|
||
return
|
||
case <-time.After(time.Millisecond * 200): //阻塞超过200ms丢弃
|
||
logx.Error("failed to send to out chan,time expired,data:", string(data))
|
||
return
|
||
}
|
||
}
|
||
|
||
// 发送接受到的消息到入口缓冲队列中
|
||
func (w *wsConnectItem) sendToInChan(data []byte) {
|
||
select {
|
||
case <-w.closeChan: //关闭了
|
||
return
|
||
case w.inChan <- data:
|
||
return
|
||
case <-time.After(time.Millisecond * 200): //200豪秒超时丢弃，说明超过消费速度了
|
||
w.sendToOutChan(w.respondDataFormat(constants.WEBSOCKET_INCOME_CACHE_QUEUE_OVERFLOW, "send message is too frequent,the message is ignore by system:"+string(data)))
|
||
return
|
||
}
|
||
}
|
||
|
||
// 格式化为websocket标准返回格式
|
||
func (w *wsConnectItem) respondDataFormat(msgType constants.Websocket, data interface{}) []byte {
|
||
d := websocket_data.DataTransferData{
|
||
T: msgType,
|
||
D: data,
|
||
}
|
||
b, _ := json.Marshal(d)
|
||
return b
|
||
}
|
||
|
||
// 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)
|
||
}
|