Stubborn

Stubborn is a framework that's written in Go for clients that uses duplex protocols such as WebSocket.

Status

The Stubborn framework provides a complete and tested persistent connection for the duplex protocols using various types of clients.

Installation

go get github.com/filinvadim/stubborn

Stubborn advantages

1. Agnostic to any clients by DuplexConnector interface.
2. Therefore, it's fully testable using mock that implements three methods:

   Close() error
   ReadMessage() (messageType int, p []byte, err error)
   WriteMessage(messageType int, data []byte) error
   

3. Persistence. Stubborn framework won't stop fetching data even if panic() occurs (that's useful if for example Gorilla WebSocket was used as client).
4. Fairly configurable for any API requirements.
5. No external dependencies whatsoever.

Stubborn disadvantages

1. Framework wasn't benchmark tested but expected average speed.

Protocol examples

• Echo wss client example
• Echo http2 client example

Crypto exchange pseudocode examples

• Binance

func BinanceStream(key, secret string) (err error) {
	interrupt := make(chan os.Signal, 1)
	signal.Notify(interrupt, syscall.SIGTERM, syscall.SIGINT)

	var stream binance.BinanceAPIStreamer

	stub := stubborn.NewStubborn(stubborn.Config{
		URL:             "wss://stream.binance.com:9443/ws/",
		IsReconnectable: true,
		MessageType:     stubborn.TextMessage,
		Print: func(args ...interface{}) {
			fmt.Println(args)
			return
		},
		Dialerf: func(ctx context.Context) (stubborn.DuplexConnector, error) {
			stream, err = b.StartUserDataStream(key, secret)
			if err != nil {
				return nil, err
			}
			conn, _, err := websocket.DefaultDialer.DialContext(
				ctx,
				fmt.Sprintf("%s%s", "wss://stream.binance.com:9443/ws/", stream.ListenKey()),
				nil)
			return conn, err
		},
		UnimportantErrs: []error{io.EOF},
	})

	stub.SetErrorHandler(func(err error) { fmt.Println("binance websocket error:", err) })

	stub.SetKeepAliveHandler(stubborn.KeepAlive{
		Tick: time.Tick(time.Hour - time.Minute),
		CustomPing: func() (msgType int, payload []byte) {
			stream.KeepAliveStream()
			return stubborn.PingMessage, []byte{}
		},
	})

	stub.SetMessageHandler(func(resp []byte) {
		fmt.Println("RESPONSE:", string(resp))
	})

	err = stub.Connect(b.ctx)
	if err != nil {
		return err
	}
	<-interrupt
    
	defer func() {
		stub.Close()
	}
	return nil
}

• Huobi

func HuobiTradesSubscribe(key, secret string) (err error) {
	interrupt := make(chan os.Signal, 1)
	signal.Notify(interrupt, syscall.SIGTERM, syscall.SIGINT)
	
	sub := "{\"action\":\"sub\", \"ch\":\"trade.clearing#*#0\", \"cid\": \"someId\"}"
	unsub := "{\"action\":\"unsub\", \"ch\":\"trade.clearing#*\", \"cid\": \"someId\"}"

	path := "/ws/v2"
	wsUrl := fmt.Sprintf("wss://%s%s", "api-aws.huobi.pro", path)

	stub := stubborn.NewStubborn(stubborn.Config{
		URL:             wsUrl,
		IsReconnectable: true,
		MessageType:     stubborn.TextMessage,
		Print: func(args ...interface{}) {
			fmt.Println(args)
			return
		},
		Dialerf: func(ctx context.Context) (stubborn.DuplexConnector, error) {
			conn, _, err := websocket.DefaultDialer.DialContext(
				ctx,
				wsUrl,
				nil)

			return conn, err
		},
		AuthTimeOut:     5 * time.Second,
		UnimportantErrs: []error{io.EOF},
	})
	stub.SetAuthHandler(func() (req []byte, resp []byte, err error) {
		req, err = new(huobi.WebSocketV2RequestBuilder).Build(key, secret, "api-aws.huobi.pro", path)
		if err != nil {
			return nil, nil, err
		}

		resp = []byte(`{
			"action": "req",
				"code": 200,
				"ch": "auth",
				"data": {}
		}`)
		return
	})

	stub.SetErrorHandler(func(err error) {
		fmt.Println("huobi websocket error:", err)

		if errors.Is(err, stubborn.ErrCritical) {
			// resubscribe
			err = stub.Send(stubborn.TextMessage, []byte(sub))
			if err != nil {
				fmt.Println("huobi websocket error:", err)
			}
		}
	})

	stub.SetKeepAliveHandler(stubborn.KeepAlive{
		Tick: time.After(1 * time.Hour), 
		CustomPong: func(typ int, payload []byte) (int, []byte) {
			ping := struct {
				Action string `json:"action"`
				Data   *struct {
					Timestamp int64 `json:"ts"`
				} `json:"data"`
			}{}
			err := json.Unmarshal(payload, &ping)
			if err != nil {
				return 0, nil
			}
			
			pong := fmt.Sprintf("{\"action\": \"pong\", \"data\": { \"ts\": %d } }", ping.Data.Timestamp)
			return stubborn.TextMessage, []byte(pong)
		},
	})

	stub.SetMessageHandler(func(resp []byte) {
		fmt.Println("RESPONSE:", string(resp))
	})

	err = stub.Connect(hc.ctx)
	if err != nil {
		return err
	}

	// subscribe
	err = stub.Send(stubborn.TextMessage, []byte(sub))
	if err != nil {
		return err
	}
	<-interrupt
	defer func() {
		stub.Send(stubborn.TextMessage, []byte(unsub))
		stub.Close()
	}
	return nil
}

• Okex

func OkexOrdersSubscribe(key, secret, pass string) (err error) {
	interrupt := make(chan os.Signal, 1)
	signal.Notify(interrupt, syscall.SIGTERM, syscall.SIGINT)
	
	var url  = "wss://real.okex.com:8443/ws/v3?compress=true"
	
	subOp := BaseOp{
		Op:   "subscribe",
		Args: []string{"spot/order:ETH-USDT"},
	}

	subMsg, _ := json.Marshal(subOp)

	stub := stubborn.NewStubborn(stubborn.Config{
		URL:             url,
		IsReconnectable: true,
		MessageType:     stubborn.TextMessage,
		Print: func(args ...interface{}) {
			fmt.Println(args)
			return
		},
		Dialerf: func(ctx context.Context) (stubborn.DuplexConnector, error) {
			conn, _, err := websocket.DefaultDialer.DialContext(
				ctx,
				url,
				nil,
			)

			return conn, err
		},
		AuthTimeOut:     5 * time.Second,
		UnimportantErrs: []error{io.EOF},
	})

	stub.SetAuthHandler(func() (req []byte, resp []byte, err error) {
		resp = []byte(`{"event":"login","success":true}`)
        	et := epochTime()
		signingString := et + http.MethodGet + "/users/self/verify"
		signed, err := hmacSha256Base64Sign(signingString, secret)
		if err != nil {
			return nil, nil, err
		}

		b := BaseOp{
			Op:   "login",
			Args: []string{key, pass, et, signed},
		}
		req, err = json.Marshal(b)
		return
	})

	stub.SetErrorHandler(func(err error) {
		fmt.Println("okex websocket error:", err)
		if errors.Is(err, stubborn.ErrCritical) {
			// resubscribe
			err = stub.Send(stubborn.TextMessage, subMsg)
			if err != nil {
				fmt.Println("okex websocket error:", err)
			}
		}
	})

	stub.SetKeepAliveHandler(stubborn.KeepAlive{
		Tick: time.Tick(25 * time.Second),
		CustomPing: func() (msgType int, payload []byte) {
			return stubborn.TextMessage, []byte("ping")
		},
	})

	stub.SetMessageHandler(func(resp []byte) {
		fmt.Println("RESPONSE:", string(resp))
	})

	err = stub.Connect(oc.ctx)
	if err != nil {
		return err
	}

	// subscribe
	err = stub.Send(stubborn.TextMessage, subMsg)
	if err != nil {
		return err
	}
	<-interrupt
	defer func() {
		unsubOp := BaseOp{
			Op:   "unsubcribe",
			Args: args,
		}
		unsubMsg, _ := json.Marshal(unsubOp)
		stub.Send(stubborn.TextMessage, unsubMsg)
		stub.Close()
	}
	return nil
}