bbgo_origin/pkg/exchange/kucoin/exchange.go

package kucoin

import (
	"context"
	"strconv"

	"github.com/c9s/bbgo/pkg/exchange/kucoin/kucoinapi"
	"github.com/c9s/bbgo/pkg/types"
	"github.com/pkg/errors"
	"github.com/sirupsen/logrus"
)

// OKB is the platform currency of OKEx, pre-allocate static string here
const KCS = "KCS"

var log = logrus.WithFields(logrus.Fields{
	"exchange": "kucoin",
})

type Exchange struct {
	key, secret, passphrase string
	client                  *kucoinapi.RestClient
}

func New(key, secret, passphrase string) *Exchange {
	client := kucoinapi.NewClient()

	// for public access mode
	if len(key) > 0 && len(secret) > 0 && len(passphrase) > 0 {
		client.Auth(key, secret, passphrase)
	}

	return &Exchange{
		key:        key,
		secret:     secret,
		passphrase: passphrase,
		client:     client,
	}
}

func (e *Exchange) Name() types.ExchangeName {
	return types.ExchangeKucoin
}

func (e *Exchange) PlatformFeeCurrency() string {
	return KCS
}

func (e *Exchange) QueryAccount(ctx context.Context) (*types.Account, error) {
	accounts, err := e.client.AccountService.ListAccounts()
	if err != nil {
		return nil, err
	}

	// for now, we only return the trading account
	a := types.NewAccount()
	balances := toGlobalBalanceMap(accounts)
	a.UpdateBalances(balances)
	return a, nil
}

func (e *Exchange) QueryAccountBalances(ctx context.Context) (types.BalanceMap, error) {
	accounts, err := e.client.AccountService.ListAccounts()
	if err != nil {
		return nil, err
	}

	return toGlobalBalanceMap(accounts), nil
}

func (e *Exchange) QueryMarkets(ctx context.Context) (types.MarketMap, error) {
	markets, err := e.client.MarketDataService.ListSymbols()
	if err != nil {
		return nil, err
	}

	marketMap := types.MarketMap{}
	for _, s := range markets {
		market := toGlobalMarket(s)
		marketMap.Add(market)
	}

	return marketMap, nil
}

func (e *Exchange) QueryTicker(ctx context.Context, symbol string) (*types.Ticker, error) {
	s, err := e.client.MarketDataService.GetTicker24HStat(symbol)
	if err != nil {
		return nil, err
	}

	ticker := toGlobalTicker(*s)
	return &ticker, nil
}

func (e *Exchange) QueryTickers(ctx context.Context, symbols ...string) (map[string]types.Ticker, error) {
	tickers := map[string]types.Ticker{}
	if len(symbols) > 0 {
		for _, s := range symbols {
			t, err := e.QueryTicker(ctx, s)
			if err != nil {
				return nil, err
			}

			tickers[s] = *t
		}

		return tickers, nil
	}

	allTickers, err := e.client.MarketDataService.ListTickers()
	if err != nil {
		return nil, err
	}

	for _, s := range allTickers.Ticker {
		tickers[ s.Symbol ] = toGlobalTicker(s)
	}

	return tickers, nil
}

func (e *Exchange) QueryKLines(ctx context.Context, symbol string, interval types.Interval, options types.KLineQueryOptions) ([]types.KLine, error) {
	panic("implement me")
}

func (e *Exchange) SubmitOrders(ctx context.Context, orders ...types.SubmitOrder) (createdOrders types.OrderSlice, err error) {
	panic("implement me")
	return nil, nil
}

func (e *Exchange) QueryOpenOrders(ctx context.Context, symbol string) (orders []types.Order, err error) {
	panic("implement me")
	return nil, nil
}

func (e *Exchange) CancelOrders(ctx context.Context, orders ...types.Order) error {
	panic("implement me")
	return nil
}

func (e *Exchange) NewStream() types.Stream {
	return NewStream(e.client, e)
}

var ErrMissingSequence = errors.New("sequence is missing")

func (e *Exchange) QueryDepth(ctx context.Context, symbol string) (types.SliceOrderBook, int64, error) {
	orderBook, err := e.client.MarketDataService.GetOrderBook(toLocalSymbol(symbol), 100)
	if err != nil {
		return types.SliceOrderBook{}, 0, err
	}

	if len(orderBook.Sequence) == 0 {
		return types.SliceOrderBook{}, 0, ErrMissingSequence
	}

	sequence, err := strconv.ParseInt(orderBook.Sequence, 10, 64)
	if err != nil {
		return types.SliceOrderBook{}, 0, err
	}

	return types.SliceOrderBook{
		Symbol: toGlobalSymbol(symbol),
		Bids:   orderBook.Bids,
		Asks:   orderBook.Asks,
	}, sequence, nil
}