kucoin: add websocket command for testing connection

examples/kucoin/websocket.go

@@ -0,0 +1,123 @@
+package main
+
+import (
+	"context"
+	"errors"
+	"net/url"
+	"os"
+	"os/signal"
+	"time"
+
+	"github.com/c9s/bbgo/pkg/exchange/kucoin/kucoinapi"
+	"github.com/gorilla/websocket"
+	"github.com/sirupsen/logrus"
+	"github.com/spf13/cobra"
+)
+
+func init() {
+	rootCmd.AddCommand(websocketCmd)
+}
+
+var websocketCmd = &cobra.Command{
+	Use: "websocket",
+
+	// SilenceUsage is an option to silence usage when an error occurs.
+	SilenceUsage: true,
+
+	Args: cobra.ExactArgs(1),
+
+	RunE: func(cmd *cobra.Command, args []string) error {
+		if len(args) == 0 {
+			return nil
+		}
+
+		var ctx = context.Background()
+		var t = args[0]
+		var err error
+		var bullet *kucoinapi.Bullet
+
+		switch t {
+		case "public":
+			bullet, err = client.BulletService.NewGetPublicBulletRequest().Do(ctx)
+			if err != nil {
+				return err
+			}
+
+			logrus.Infof("public bullet: %+v", bullet)
+
+		case "private":
+			bullet, err = client.BulletService.NewGetPrivateBulletRequest().Do(ctx)
+			if err != nil {
+				return err
+			}
+
+			logrus.Infof("private bullet: %+v", bullet)
+
+		default:
+			return errors.New("valid bullet type: public, private")
+
+		}
+
+
+		u, err := url.Parse(bullet.InstanceServers[0].Endpoint)
+		if err != nil {
+			return err
+		}
+
+		interrupt := make(chan os.Signal, 1)
+		signal.Notify(interrupt, os.Interrupt)
+
+		params := url.Values{}
+		params.Add("token", bullet.Token)
+		u.RawQuery = params.Encode()
+
+		logrus.Infof("connecting %s", u.String())
+
+		c, _, err := websocket.DefaultDialer.Dial(u.String(), nil)
+		if err != nil {
+			logrus.Fatal("dial:", err)
+		}
+		defer c.Close()
+
+		done := make(chan struct{})
+
+		go func() {
+			defer close(done)
+			for {
+				_, message, err := c.ReadMessage()
+				if err != nil {
+					logrus.Infoln("read:", err)
+					return
+				}
+
+				logrus.Infof("recv: %s", message)
+			}
+		}()
+
+		for {
+			select {
+			case <-done:
+				return nil
+
+			case <-interrupt:
+				logrus.Infof("interrupt")
+
+				// Cleanly close the connection by sending a close message and then
+				// waiting (with timeout) for the server to close the connection.
+				err := c.WriteMessage(websocket.CloseMessage, websocket.FormatCloseMessage(websocket.CloseNormalClosure, ""))
+				if err != nil {
+					logrus.Error("write close:", err)
+					return nil
+				}
+
+				select {
+					case <-done:
+					case <-time.After(time.Second):
+				}
+				return nil
+			}
+		}
+
+		return nil
+	},
+}