golang websocket内存泄漏

我们有一个基于go-socket.io（socket.io golang实现）和gorilla websocket的websocket服务，但似乎有内存泄漏问题 . 即使我使用debug.FreeOSMemroy强制释放内存，HeapAlloc总是增加 .

服务很简单 . 它将使用jwt令牌验证请求，如果验证成功，则将基于gorilla websocket conn创建一个go-socket.io conn . 但是现在似乎 net/textproto.(Reader).ReadMIMEHeader （包含在net / http . （ conn）.serve中的net / http.readRequest）占用了很多让我困惑的内存，因为当请求劫持websocket conn时，net / http . （* conn）.serve goroutine将立即返回 .

• 堆在使用中的调用图

https://lh3.googleusercontent.com/-mm2uAP5ihFM/V9IVWSlqUFI/AAAAAAAAAFc/8lLdQ3XgKCgeuCxQN81VQ8U5mDJcQxvWQCLcB/s1600/heap_in_use.png

• heap alloc space callgraph

https://lh3.googleusercontent.com/-zKpnnKowYcc/V9IV5Ncxs3I/AAAAAAAAAFg/hcptQ-bmiwsmRbFYnvTEB9jNylbJ8nh3gCLcB/s1600/heap_alloc.png

• gc跟踪日志

gc 440 @51045.897s 0%: 0.034+4182+0.96 ms clock, 0.13+0/4182/12246+3.8 ms cpu, 4304->4309->4143 MB, 8266 MB goal, 4 P
scvg340: inuse: 4404, idle: 15, sys: 4419, released: 0, consumed: 4419 (MB)
GC forced
gc 441 @51170.096s 0%: 3.7+4355+1.4 ms clock, 14+2.9/4357/12795+5.8 ms cpu, 4317->4323->4158 MB, 8287 MB goal, 4 P
GC forced
gc 442 @51294.460s 0%: 0.034+3987+1.2 ms clock, 0.13+1.5/3987/11701+4.9 ms cpu, 4336->4341->4169 MB, 8316 MB goal, 4 P
scvg341: inuse: 4318, idle: 133, sys: 4451, released: 0, consumed: 4451 (MB)
GC forced
gc 443 @51418.451s 0%: 0.36+3925+0.99 ms clock, 1.4+4.0/3925/11554+3.9 ms cpu, 4350->4356->4182 MB, 8338 MB goal, 4 P
scvg342: inuse: 4363, idle: 103, sys: 4466, released: 0, consumed: 4466 (MB)
GC forced
gc 444 @51542.394s 0%: 0.042+3986+1.6 ms clock, 0.16+0/3981/11757+6.5 ms cpu, 4361->4367->4194 MB, 8365 MB goal, 4 P
scvg343: inuse: 4404, idle: 74, sys: 4478, released: 0, consumed: 4478 (MB)
GC forced
gc 445 @51666.384s 0%: 3.4+3987+1.4 ms clock, 13+2.5/3986/11747+5.7 ms cpu, 4375->4382->4208 MB, 8388 MB goal, 4 P
scvg344: inuse: 4454, idle: 39, sys: 4493, released: 0, consumed: 4493 (MB)
GC forced
gc 446 @51790.379s 0%: 0.055+4147+1.5 ms clock, 0.22+0/4139/12125+6.2 ms cpu, 4396->4402->4220 MB, 8416 MB goal, 4 P
scvg345: inuse: 4509, idle: 5, sys: 4514, released: 0, consumed: 4514 (MB)
GC forced
gc 447 @51914.542s 0%: 0.052+4205+2.1 ms clock, 0.21+1.5/4199/12348+8.5 ms cpu, 4413->4420->4234 MB, 8441 MB goal, 4 P
GC forced
gc 448 @52038.752s 0%: 2.7+4517+1.8 ms clock, 11+2.3/4517/13245+7.2 ms cpu, 4428->4436->4247 MB, 8469 MB goal, 4 P
scvg346: inuse: 4406, idle: 142, sys: 4548, released: 0, consumed: 4548 (MB)
GC forced
gc 449 @52163.276s 0%: 0.033+4206+1.3 ms clock, 0.13+0/4206/12306+5.3 ms cpu, 4442->4449->4259 MB, 8495 MB goal, 4 P
scvg347: inuse: 4452, idle: 109, sys: 4561, released: 0, consumed: 4561 (MB)
GC forced
gc 450 @52287.491s 0%: 0.044+4262+2.0 ms clock, 0.17+0/4261/12565+8.2 ms cpu, 4452->4459->4272 MB, 8519 MB goal, 4 P
scvg348: inuse: 4498, idle: 74, sys: 4572, released: 0, consumed: 4572 (MB)
GC forced
gc 451 @52411.769s 0%: 0.028+4012+2.0 ms clock, 0.11+0.066/3992/11762+8.0 ms cpu, 4471->4477->4285 MB, 8544 MB goal, 4 P
scvg349: inuse: 4550, idle: 40, sys: 4590, released: 0, consumed: 4590 (MB)

• 代码示例

func (c *CometServer) initHTTPServer() {

jwtMiddleware := jwtmiddleware.New(jwtmiddleware.Options{
        SigningMethod: jwt.SigningMethodHS256,
        ValidationKeyGetter: func(token *jwt.Token) (interface{}, error) {
                return []byte(setting.JwtSecret), nil
        },

        // get token from header, querystring, and cookie
        Extractor: jwtmiddleware.FromFirst(
                jwtmiddleware.FromParameter(setting.JwtTokenQueryStringField),
                TokenFromCookie(setting.JwtTokenCookieField),
                jwtmiddleware.FromAuthHeader,
        ),
        ErrorHandler: jwtErrorHandler,
})

r := mux.NewRouter()
// Must call cotext.Clear after every request follow
r.KeepContext = true

socketHandler := jwtMiddleware.Handler(c.socketio)

r.Handle("/socket.io/", socketHandler)

if setting.DEBUG {
        r.PathPrefix("/debug/").Handler(http.DefaultServeMux)
        r.PathPrefix("/").Handler(http.FileServer(http.Dir("./asset/")))
}

// n.UseHandler(r)

c.httpServer = &http.Server{
        Addr:    setting.HTTPListenAddr,
        Handler: r,
}

}

// .... // go-socket.io code // .... func（c * CometServer）initSocketIO（）error {server，err：= socketio.NewServer（transports）if err！= nil

// ....

server.On("error", func(so socketio.Socket, err error) {
        logger := SocketLogger(so)
        logger.Error("socket connect error")
})

server.On（“connection”，func（so socketio.Socket）{

var (
                uid   string
                exist bool
        )

        logger := SocketLogger(so)

        claim := (context.Get(so.Request(), "user")).(*jwt.Token).Claims
        // after get the claims, should clear the request context
        context.Clear(so.Request())

        var rawUID interface{}
        if user, ok := claim.(jwt.MapClaims); ok {
                if rawUID, ok = user[setting.JwtUserClaimField]; !ok {
                        logger.Error("invalid user claim")
                        so.Emit("disconnect", "invalid user claim")
                }
        } else {
                logger.Errorf("invalid jwt claim %s", claim)
                so.Emit("disconnect", "invalid user claim")
        }

        if uid, exist = rawUID.(string); exist {
                // Multi connection for same user will be join to the same room
                so.Join(uid)

                // root for broadcast all user
                so.Join(Hourse)

                c.users.Add(uid, 1)

                logger.Debug("socket connected")

                if setting.DEBUG {
                        so.Emit("debug", fmt.Sprintf("Your uid is %s, sid is %s", uid, so.Id()))
                }
        } else {
                so.Emit("disconnect", "invalid user claim")
        }

        so.On("debug", func(data string) {
                log.Debugf("debug data from client %s", data)
        })

        so.On("disconnection", func(data string) {
                logger.Debugf("socket disconnected")
                c.users.Add(uid, -1)
        })
})
c.socketio = server

return nil

}