pkg/exchange: implement bybit stream ping

pkg/exchange/bybit/bybitapi/client.go

@@ -19,8 +19,13 @@ import (
 	"github.com/c9s/bbgo/pkg/types"
 )
 
-const defaultHTTPTimeout = time.Second * 15
-const RestBaseURL = "https://api.bybit.com"
+const (
+	defaultHTTPTimeout = time.Second * 15
+
+	RestBaseURL         = "https://api.bybit.com"
+	WsSpotPublicSpotUrl = "wss://stream.bybit.com/v5/public/spot"
+	WsSpotPrivateUrl    = "wss://stream.bybit.com/v5/private"
+)
 
 // defaultRequestWindowMilliseconds specify how long an HTTP request is valid. It is also used to prevent replay attacks.
 var defaultRequestWindowMilliseconds = fmt.Sprintf("%d", 5*time.Second.Milliseconds())

pkg/exchange/bybit/exchange.go

@@ -387,3 +387,7 @@ func (e *Exchange) QueryTrades(ctx context.Context, symbol string, options *type
 
 	return trades, nil
 }
+
+func (e *Exchange) NewStream() types.Stream {
+	return NewStream()
+}

pkg/exchange/bybit/stream.go

@@ -0,0 +1,96 @@
+package bybit
+
+import (
+	"context"
+	"encoding/json"
+	"time"
+
+	"github.com/gorilla/websocket"
+
+	"github.com/c9s/bbgo/pkg/exchange/bybit/bybitapi"
+	"github.com/c9s/bbgo/pkg/types"
+)
+
+const (
+	// Bybit: To avoid network or program issues, we recommend that you send the ping heartbeat packet every 20 seconds
+	// to maintain the WebSocket connection.
+	pingInterval = 20 * time.Second
+)
+
+type Stream struct {
+	types.StandardStream
+}
+
+func NewStream() *Stream {
+	stream := &Stream{
+		StandardStream: types.NewStandardStream(),
+	}
+
+	stream.SetEndpointCreator(stream.createEndpoint)
+	stream.SetParser(stream.parseWebSocketEvent)
+	stream.SetDispatcher(stream.dispatchEvent)
+	stream.SetHeartBeat(stream.ping)
+
+	return stream
+}
+
+func (s *Stream) createEndpoint(_ context.Context) (string, error) {
+	var url string
+	if s.PublicOnly {
+		url = bybitapi.WsSpotPublicSpotUrl
+	} else {
+		url = bybitapi.WsSpotPrivateUrl
+	}
+	return url, nil
+}
+
+func (s *Stream) dispatchEvent(event interface{}) {
+	switch e := event.(type) {
+	case *WebSocketEvent:
+		if err := e.IsValid(); err != nil {
+			log.Errorf("invalid event: %v", err)
+		}
+	}
+}
+
+func (s *Stream) parseWebSocketEvent(in []byte) (interface{}, error) {
+	var resp WebSocketEvent
+	return &resp, json.Unmarshal(in, &resp)
+}
+
+// ping implements the Bybit text message of WebSocket PingPong.
+func (s *Stream) ping(ctx context.Context, conn *websocket.Conn, cancelFunc context.CancelFunc) {
+	defer func() {
+		log.Debug("[bybit] ping worker stopped")
+		cancelFunc()
+	}()
+
+	var pingTicker = time.NewTicker(pingInterval)
+	defer pingTicker.Stop()
+
+	for {
+		select {
+
+		case <-ctx.Done():
+			return
+
+		case <-s.CloseC:
+			return
+
+		case <-pingTicker.C:
+			// it's just for maintaining the liveliness of the connection, so comment out ReqId.
+			err := conn.WriteJSON(struct {
+				//ReqId string `json:"req_id"`
+				Op WsOpType `json:"op"`
+			}{
+				//ReqId: uuid.NewString(),
+				Op: WsOpTypePing,
+			})
+			if err != nil {
+				log.WithError(err).Error("ping error", err)
+				s.Reconnect()
+				return
+			}
+		}
+	}
+}

pkg/exchange/bybit/types.go

@@ -0,0 +1,39 @@
+package bybit
+
+import (
+	"fmt"
+)
+
+type WsOpType string
+
+const (
+	WsOpTypePing WsOpType = "ping"
+	WsOpTypePong WsOpType = "pong"
+)
+
+type WebSocketEvent struct {
+	Success *bool   `json:"success,omitempty"`
+	RetMsg  *string `json:"ret_msg,omitempty"`
+	ReqId   *string `json:"req_id,omitempty"`
+
+	ConnId string   `json:"conn_id"`
+	Op     WsOpType `json:"op"`
+	Args   []string `json:"args"`
+}
+
+func (w *WebSocketEvent) IsValid() error {
+	switch w.Op {
+	case WsOpTypePing:
+		// public event
+		if (w.Success != nil && !*w.Success) ||
+			(w.RetMsg != nil && WsOpType(*w.RetMsg) != WsOpTypePong) {
+			return fmt.Errorf("unexpeted response of pong: %#v", w)
+		}
+		return nil
+	case WsOpTypePong:
+		// private event
+		return nil
+	default:
+		return fmt.Errorf("unexpected op type: %#v", w)
+	}
+}

pkg/exchange/bybit/types_test.go

@@ -0,0 +1,191 @@
+package bybit
+
+import (
+	"fmt"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func Test_parseWebSocketEvent(t *testing.T) {
+	t.Run("[public] PingEvent without req id", func(t *testing.T) {
+		s := NewStream()
+		msg := `{"success":true,"ret_msg":"pong","conn_id":"a806f6c4-3608-4b6d-a225-9f5da975bc44","op":"ping"}`
+		raw, err := s.parseWebSocketEvent([]byte(msg))
+		assert.NoError(t, err)
+
+		expSucceeds := true
+		expRetMsg := string(WsOpTypePong)
+		e, ok := raw.(*WebSocketEvent)
+		assert.True(t, ok)
+		assert.Equal(t, &WebSocketEvent{
+			Success: &expSucceeds,
+			RetMsg:  &expRetMsg,
+			ConnId:  "a806f6c4-3608-4b6d-a225-9f5da975bc44",
+			ReqId:   nil,
+			Op:      WsOpTypePing,
+			Args:    nil,
+		}, e)
+
+		assert.NoError(t, e.IsValid())
+	})
+
+	t.Run("[public] PingEvent with req id", func(t *testing.T) {
+		s := NewStream()
+		msg := `{"success":true,"ret_msg":"pong","conn_id":"a806f6c4-3608-4b6d-a225-9f5da975bc44","req_id":"b26704da-f5af-44c2-bdf7-935d6739e1a0","op":"ping"}`
+		raw, err := s.parseWebSocketEvent([]byte(msg))
+		assert.NoError(t, err)
+
+		expSucceeds := true
+		expRetMsg := string(WsOpTypePong)
+		expReqId := "b26704da-f5af-44c2-bdf7-935d6739e1a0"
+		e, ok := raw.(*WebSocketEvent)
+		assert.True(t, ok)
+		assert.Equal(t, &WebSocketEvent{
+			Success: &expSucceeds,
+			RetMsg:  &expRetMsg,
+			ConnId:  "a806f6c4-3608-4b6d-a225-9f5da975bc44",
+			ReqId:   &expReqId,
+			Op:      WsOpTypePing,
+			Args:    nil,
+		}, e)
+
+		assert.NoError(t, e.IsValid())
+	})
+
+	t.Run("[private] PingEvent without req id", func(t *testing.T) {
+		s := NewStream()
+		msg := `{"op":"pong","args":["1690884539181"],"conn_id":"civn4p1dcjmtvb69ome0-yrt1"}`
+		raw, err := s.parseWebSocketEvent([]byte(msg))
+		assert.NoError(t, err)
+
+		e, ok := raw.(*WebSocketEvent)
+		assert.True(t, ok)
+		assert.Equal(t, &WebSocketEvent{
+			Success: nil,
+			RetMsg:  nil,
+			ConnId:  "civn4p1dcjmtvb69ome0-yrt1",
+			ReqId:   nil,
+			Op:      WsOpTypePong,
+			Args:    []string{"1690884539181"},
+		}, e)
+
+		assert.NoError(t, e.IsValid())
+	})
+
+	t.Run("[private] PingEvent with req id", func(t *testing.T) {
+		s := NewStream()
+		msg := `{"req_id":"78d36b57-a142-47b7-9143-5843df77d44d","op":"pong","args":["1690884539181"],"conn_id":"civn4p1dcjmtvb69ome0-yrt1"}`
+		raw, err := s.parseWebSocketEvent([]byte(msg))
+		assert.NoError(t, err)
+
+		expReqId := "78d36b57-a142-47b7-9143-5843df77d44d"
+		e, ok := raw.(*WebSocketEvent)
+		assert.True(t, ok)
+		assert.Equal(t, &WebSocketEvent{
+			Success: nil,
+			RetMsg:  nil,
+			ConnId:  "civn4p1dcjmtvb69ome0-yrt1",
+			ReqId:   &expReqId,
+			Op:      WsOpTypePong,
+			Args:    []string{"1690884539181"},
+		}, e)
+
+		assert.NoError(t, e.IsValid())
+	})
+}
+
+func Test_WebSocketEventIsValid(t *testing.T) {
+	t.Run("[public] valid op ping", func(t *testing.T) {
+		expSucceeds := true
+		expRetMsg := string(WsOpTypePong)
+		expReqId := "b26704da-f5af-44c2-bdf7-935d6739e1a0"
+
+		w := &WebSocketEvent{
+			Success: &expSucceeds,
+			RetMsg:  &expRetMsg,
+			ReqId:   &expReqId,
+			ConnId:  "test-conndid",
+			Op:      WsOpTypePing,
+			Args:    nil,
+		}
+		assert.NoError(t, w.IsValid())
+	})
+
+	t.Run("[private] valid op ping", func(t *testing.T) {
+		w := &WebSocketEvent{
+			Success: nil,
+			RetMsg:  nil,
+			ReqId:   nil,
+			ConnId:  "test-conndid",
+			Op:      WsOpTypePong,
+			Args:    nil,
+		}
+		assert.NoError(t, w.IsValid())
+	})
+
+	t.Run("[public] un-Success", func(t *testing.T) {
+		expSucceeds := false
+		expRetMsg := string(WsOpTypePong)
+		expReqId := "b26704da-f5af-44c2-bdf7-935d6739e1a0"
+
+		w := &WebSocketEvent{
+			Success: &expSucceeds,
+			RetMsg:  &expRetMsg,
+			ReqId:   &expReqId,
+			ConnId:  "test-conndid",
+			Op:      WsOpTypePing,
+			Args:    nil,
+		}
+		assert.Error(t, fmt.Errorf("unexpeted response of pong: %#v", w), w.IsValid())
+	})
+
+	t.Run("[public] missing Success field", func(t *testing.T) {
+		expRetMsg := string(WsOpTypePong)
+		expReqId := "b26704da-f5af-44c2-bdf7-935d6739e1a0"
+
+		w := &WebSocketEvent{
+			RetMsg: &expRetMsg,
+			ReqId:  &expReqId,
+			ConnId: "test-conndid",
+			Op:     WsOpTypePing,
+			Args:   nil,
+		}
+		assert.Error(t, fmt.Errorf("unexpeted response of pong: %#v", w), w.IsValid())
+	})
+
+	t.Run("[public] invalid ret msg", func(t *testing.T) {
+		expSucceeds := false
+		expRetMsg := "PINGPONGPINGPONG"
+		expReqId := "b26704da-f5af-44c2-bdf7-935d6739e1a0"
+
+		w := &WebSocketEvent{
+			Success: &expSucceeds,
+			RetMsg:  &expRetMsg,
+			ReqId:   &expReqId,
+			ConnId:  "test-conndid",
+			Op:      WsOpTypePing,
+			Args:    nil,
+		}
+		assert.Error(t, fmt.Errorf("unexpeted response of pong: %#v", w), w.IsValid())
+	})
+
+	t.Run("[public] missing RetMsg field", func(t *testing.T) {
+		expReqId := "b26704da-f5af-44c2-bdf7-935d6739e1a0"
+
+		w := &WebSocketEvent{
+			ReqId:  &expReqId,
+			ConnId: "test-conndid",
+			Op:     WsOpTypePing,
+			Args:   nil,
+		}
+		assert.Error(t, fmt.Errorf("unexpeted response of pong: %#v", w), w.IsValid())
+	})
+
+	t.Run("unexpected op type", func(t *testing.T) {
+		w := &WebSocketEvent{
+			Op: WsOpType("unexpected"),
+		}
+		assert.Error(t, fmt.Errorf("unexpected op type: %#v", w), w.IsValid())
+	})
+}