kucoin: add orderbook api

examples/kucoin/main.go

@@ -21,6 +21,7 @@ func init() {
 	rootCmd.AddCommand(subAccountsCmd)
 	rootCmd.AddCommand(symbolsCmd)
 	rootCmd.AddCommand(tickersCmd)
+	rootCmd.AddCommand(orderbookCmd)
 }
 
 var rootCmd = &cobra.Command{

examples/kucoin/orderbook.go

@@ -0,0 +1,40 @@
+package main
+
+import (
+	"strconv"
+
+	"github.com/sirupsen/logrus"
+	"github.com/spf13/cobra"
+)
+
+var orderbookCmd = &cobra.Command{
+	Use: "orderbook",
+
+	// SilenceUsage is an option to silence usage when an error occurs.
+	SilenceUsage: true,
+
+	Args: cobra.MinimumNArgs(1),
+
+	RunE: func(cmd *cobra.Command, args []string) error {
+		if len(args) == 0 {
+			return nil
+		}
+
+		var depth = 0
+		if len(args) > 1 {
+			v, err := strconv.Atoi(args[1])
+			if err != nil {
+				return err
+			}
+			depth = v
+		}
+
+		orderBook, err := client.MarketDataService.GetOrderBook(args[0], depth)
+		if err != nil {
+			return err
+		}
+
+		logrus.Infof("orderBook: %+v", orderBook)
+		return nil
+	},
+}

pkg/exchange/kucoin/kucoinapi/marketdata.go

@@ -1,7 +1,10 @@
 package kucoinapi
 
 import (
+	"fmt"
+	"net/http"
 	"net/url"
+	"strconv"
 
 	"github.com/c9s/bbgo/pkg/fixedpoint"
 	"github.com/c9s/bbgo/pkg/types"
@@ -163,7 +166,6 @@ type AllTickers struct {
 	Ticker []Ticker24H                `json:"ticker"`
 }
 
-
 func (s *MarketDataService) ListTickers() (*AllTickers, error) {
 	req, err := s.client.newRequest("GET", "/api/v1/market/allTickers", nil, nil)
 	if err != nil {
@@ -188,3 +190,64 @@ func (s *MarketDataService) ListTickers() (*AllTickers, error) {
 	return apiResponse.Data, nil
 }
 
+/*
+{
+    "sequence": "3262786978",
+    "time": 1550653727731,
+    "bids": [["6500.12", "0.45054140"],
+             ["6500.11", "0.45054140"]],  //[price，size]
+    "asks": [["6500.16", "0.57753524"],
+             ["6500.15", "0.57753524"]]
+}
+*/
+type OrderBook struct {
+	Sequence string                     `json:"sequence"`
+	Time     types.MillisecondTimestamp `json:"time"`
+	Bids     [][]fixedpoint.Value       `json:"bids,omitempty"`
+	Asks     [][]fixedpoint.Value       `json:"asks,omitempty"`
+}
+
+func (s *MarketDataService) GetOrderBook(symbol string, depth int) (*OrderBook, error) {
+	params := url.Values{}
+	params["symbol"] = []string{symbol}
+
+	var req *http.Request
+	var err error
+
+	switch depth {
+	case 20, 100:
+		refURL := "/api/v1/market/orderbook/level2_" + strconv.Itoa(depth)
+		req, err = s.client.newRequest("GET", refURL, params, nil)
+		if err != nil {
+			return nil, err
+		}
+
+	case 0:
+		refURL := "/api/v3/market/orderbook/level2"
+		req, err = s.client.newAuthenticatedRequest("GET", refURL, params, nil)
+		if err != nil {
+			return nil, err
+		}
+
+	default:
+		return nil, fmt.Errorf("depth %d is not supported, use 20, 100 or 0", depth)
+
+	}
+
+	response, err := s.client.sendRequest(req)
+	if err != nil {
+		return nil, err
+	}
+
+	var apiResponse struct {
+		Code    string     `json:"code"`
+		Message string     `json:"msg"`
+		Data    *OrderBook `json:"data"`
+	}
+
+	if err := response.DecodeJSON(&apiResponse); err != nil {
+		return nil, err
+	}
+
+	return apiResponse.Data, nil
+}