bbgo_origin/pkg/exchange/binance/exchange.go

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package binance
import (
"context"
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"fmt"
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"os"
"strconv"
"strings"
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"time"
"github.com/adshao/go-binance/v2"
"github.com/google/uuid"
"github.com/pkg/errors"
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"github.com/sirupsen/logrus"
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"github.com/c9s/bbgo/pkg/fixedpoint"
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"github.com/c9s/bbgo/pkg/types"
"github.com/c9s/bbgo/pkg/util"
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)
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const BNB = "BNB"
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var log = logrus.WithFields(logrus.Fields{
"exchange": "binance",
})
func init() {
_ = types.Exchange(&Exchange{})
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_ = types.MarginExchange(&Exchange{})
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if ok, _ := strconv.ParseBool(os.Getenv("DEBUG_BINANCE_STREAM")); ok {
log.Level = logrus.DebugLevel
}
}
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type Exchange struct {
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types.MarginSettings
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key, secret string
Client *binance.Client
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}
func New(key, secret string) *Exchange {
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var client = binance.NewClient(key, secret)
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_, _ = client.NewSetServerTimeService().Do(context.Background())
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return &Exchange{
key: key,
secret: secret,
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Client: client,
}
}
func (e *Exchange) Name() types.ExchangeName {
return types.ExchangeBinance
}
func (e *Exchange) QueryTicker(ctx context.Context, symbol string) (*types.Ticker, error) {
req := e.Client.NewListPriceChangeStatsService()
req.Symbol(strings.ToUpper(symbol))
stats, err := req.Do(ctx)
if err != nil {
return nil, err
}
ticker := toGlobalTicker(stats[0])
return &ticker, nil
}
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func (e *Exchange) QueryTickers(ctx context.Context, symbol ...string) (map[string]types.Ticker, error) {
var tickers = make(map[string]types.Ticker)
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if len(symbol) == 1 {
ticker, err := e.QueryTicker(ctx, symbol[0])
if err != nil {
return nil, err
}
tickers[strings.ToUpper(symbol[0])] = *ticker
return tickers, nil
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}
var req = e.Client.NewListPriceChangeStatsService()
changeStats, err := req.Do(ctx)
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if err != nil {
return nil, err
}
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m := make(map[string]struct{})
exists := struct{}{}
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for _, s := range symbol {
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m[s] = exists
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}
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for _, stats := range changeStats {
if _, ok := m[stats.Symbol]; len(symbol) != 0 && !ok {
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continue
}
tick := types.Ticker{
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Volume: util.MustParseFloat(stats.Volume),
Last: util.MustParseFloat(stats.LastPrice),
Open: util.MustParseFloat(stats.OpenPrice),
High: util.MustParseFloat(stats.HighPrice),
Low: util.MustParseFloat(stats.LowPrice),
Buy: util.MustParseFloat(stats.BidPrice),
Sell: util.MustParseFloat(stats.AskPrice),
Time: time.Unix(0, stats.CloseTime*int64(time.Millisecond)),
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}
tickers[stats.Symbol] = tick
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}
return tickers, nil
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}
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func (e *Exchange) QueryMarkets(ctx context.Context) (types.MarketMap, error) {
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log.Info("querying market info...")
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exchangeInfo, err := e.Client.NewExchangeInfoService().Do(ctx)
if err != nil {
return nil, err
}
markets := types.MarketMap{}
for _, symbol := range exchangeInfo.Symbols {
market := types.Market{
Symbol: symbol.Symbol,
LocalSymbol: symbol.Symbol,
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PricePrecision: symbol.QuotePrecision,
VolumePrecision: symbol.BaseAssetPrecision,
QuoteCurrency: symbol.QuoteAsset,
BaseCurrency: symbol.BaseAsset,
}
if f := symbol.MinNotionalFilter(); f != nil {
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market.MinNotional = util.MustParseFloat(f.MinNotional)
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market.MinAmount = util.MustParseFloat(f.MinNotional)
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}
// The LOT_SIZE filter defines the quantity (aka "lots" in auction terms) rules for a symbol.
// There are 3 parts:
// minQty defines the minimum quantity/icebergQty allowed.
// maxQty defines the maximum quantity/icebergQty allowed.
// stepSize defines the intervals that a quantity/icebergQty can be increased/decreased by.
if f := symbol.LotSizeFilter(); f != nil {
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market.MinQuantity = util.MustParseFloat(f.MinQuantity)
market.MaxQuantity = util.MustParseFloat(f.MaxQuantity)
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market.StepSize = util.MustParseFloat(f.StepSize)
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}
if f := symbol.PriceFilter(); f != nil {
market.MaxPrice = util.MustParseFloat(f.MaxPrice)
market.MinPrice = util.MustParseFloat(f.MinPrice)
market.TickSize = util.MustParseFloat(f.TickSize)
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}
markets[symbol.Symbol] = market
}
return markets, nil
}
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func (e *Exchange) QueryAveragePrice(ctx context.Context, symbol string) (float64, error) {
resp, err := e.Client.NewAveragePriceService().Symbol(symbol).Do(ctx)
if err != nil {
return 0, err
}
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return util.MustParseFloat(resp.Price), nil
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}
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func (e *Exchange) NewStream() types.Stream {
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stream := NewStream(e.Client)
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stream.MarginSettings = e.MarginSettings
return stream
}
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func (e *Exchange) QueryMarginAccount(ctx context.Context) (*types.MarginAccount, error) {
account, err := e.Client.NewGetMarginAccountService().Do(ctx)
if err != nil {
return nil, err
}
return toGlobalMarginAccount(account), nil
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}
func (e *Exchange) QueryIsolatedMarginAccount(ctx context.Context, symbols ...string) (*types.IsolatedMarginAccount, error) {
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req := e.Client.NewGetIsolatedMarginAccountService()
if len(symbols) > 0 {
req.Symbols(symbols...)
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}
account, err := req.Do(ctx)
if err != nil {
return nil, err
}
return toGlobalIsolatedMarginAccount(account), nil
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}
func (e *Exchange) getLaunchDate() (time.Time, error) {
// binance launch date 12:00 July 14th, 2017
loc, err := time.LoadLocation("Asia/Shanghai")
if err != nil {
return time.Time{}, err
}
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return time.Date(2017, time.July, 14, 0, 0, 0, 0, loc), nil
}
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func (e *Exchange) Withdrawal(ctx context.Context, asset string, amount fixedpoint.Value, address string, options *types.WithdrawalOptions) error {
req := e.Client.NewCreateWithdrawService().
Asset(asset).
Address(address).
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Amount(fmt.Sprintf("%f", amount.Float64()))
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if options != nil {
if options.Network != "" {
req.Network(options.Network)
}
if options.AddressTag != "" {
req.Network(options.AddressTag)
}
}
response, err := req.Do(ctx)
if err != nil {
return err
}
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if !response.Success {
return fmt.Errorf("withdrawal request failed: %s ID=%s", response.Msg, response.ID)
}
log.Infof("withdrawal request sent, response: %+v", response)
return nil
}
func (e *Exchange) QueryWithdrawHistory(ctx context.Context, asset string, since, until time.Time) (allWithdraws []types.Withdraw, err error) {
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startTime := since
var emptyTime = time.Time{}
if startTime == emptyTime {
startTime, err = e.getLaunchDate()
if err != nil {
return nil, err
}
}
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txIDs := map[string]struct{}{}
for startTime.Before(until) {
// startTime ~ endTime must be in 90 days
endTime := startTime.AddDate(0, 0, 60)
if endTime.After(until) {
endTime = until
}
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req := e.Client.NewListWithdrawsService()
if len(asset) > 0 {
req.Asset(asset)
}
withdraws, err := req.
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StartTime(startTime.UnixNano() / int64(time.Millisecond)).
EndTime(endTime.UnixNano() / int64(time.Millisecond)).
Do(ctx)
if err != nil {
return allWithdraws, err
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}
for _, d := range withdraws {
if _, ok := txIDs[d.TxID]; ok {
continue
}
status := ""
switch d.Status {
case 0:
status = "email_sent"
case 1:
status = "cancelled"
case 2:
status = "awaiting_approval"
case 3:
status = "rejected"
case 4:
status = "processing"
case 5:
status = "failure"
case 6:
status = "completed"
default:
status = fmt.Sprintf("unsupported code: %d", d.Status)
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}
txIDs[d.TxID] = struct{}{}
allWithdraws = append(allWithdraws, types.Withdraw{
Exchange: types.ExchangeBinance,
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ApplyTime: types.Time(time.Unix(0, d.ApplyTime*int64(time.Millisecond))),
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Asset: d.Asset,
Amount: d.Amount,
Address: d.Address,
AddressTag: d.AddressTag,
TransactionID: d.TxID,
TransactionFee: d.TransactionFee,
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WithdrawOrderID: d.WithdrawOrderID,
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Network: d.Network,
Status: status,
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})
}
startTime = endTime
}
return allWithdraws, nil
}
func (e *Exchange) QueryDepositHistory(ctx context.Context, asset string, since, until time.Time) (allDeposits []types.Deposit, err error) {
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startTime := since
var emptyTime = time.Time{}
if startTime == emptyTime {
startTime, err = e.getLaunchDate()
if err != nil {
return nil, err
}
}
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txIDs := map[string]struct{}{}
for startTime.Before(until) {
// startTime ~ endTime must be in 90 days
endTime := startTime.AddDate(0, 0, 60)
if endTime.After(until) {
endTime = until
}
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req := e.Client.NewListDepositsService()
if len(asset) > 0 {
req.Asset(asset)
}
deposits, err := req.
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StartTime(startTime.UnixNano() / int64(time.Millisecond)).
EndTime(endTime.UnixNano() / int64(time.Millisecond)).
Do(ctx)
if err != nil {
return nil, err
}
for _, d := range deposits {
if _, ok := txIDs[d.TxID]; ok {
continue
}
// 0(0:pending,6: credited but cannot withdraw, 1:success)
status := types.DepositStatus(fmt.Sprintf("code: %d", d.Status))
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switch d.Status {
case 0:
status = types.DepositPending
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case 6:
// https://www.binance.com/en/support/faq/115003736451
status = types.DepositCredited
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case 1:
status = types.DepositSuccess
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}
txIDs[d.TxID] = struct{}{}
allDeposits = append(allDeposits, types.Deposit{
Exchange: types.ExchangeBinance,
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Time: types.Time(time.Unix(0, d.InsertTime*int64(time.Millisecond))),
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Asset: d.Asset,
Amount: d.Amount,
Address: d.Address,
AddressTag: d.AddressTag,
TransactionID: d.TxID,
Status: status,
})
}
startTime = endTime
}
return allDeposits, nil
}
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func (e *Exchange) QueryAccountBalances(ctx context.Context) (types.BalanceMap, error) {
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account, err := e.QueryAccount(ctx)
if err != nil {
return nil, err
}
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return account.Balances(), nil
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}
func (e *Exchange) PlatformFeeCurrency() string {
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return BNB
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}
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func (e *Exchange) QueryAccount(ctx context.Context) (*types.Account, error) {
account, err := e.Client.NewGetAccountService().Do(ctx)
if err != nil {
return nil, err
}
var balances = map[string]types.Balance{}
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for _, b := range account.Balances {
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balances[b.Asset] = types.Balance{
Currency: b.Asset,
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Available: fixedpoint.Must(fixedpoint.NewFromString(b.Free)),
Locked: fixedpoint.Must(fixedpoint.NewFromString(b.Locked)),
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}
}
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// binance use 15 -> 0.15%, so we convert it to 0.0015
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a := &types.Account{
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MakerCommission: fixedpoint.NewFromFloat(float64(account.MakerCommission) * 0.0001),
TakerCommission: fixedpoint.NewFromFloat(float64(account.TakerCommission) * 0.0001),
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}
a.UpdateBalances(balances)
return a, nil
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}
func (e *Exchange) QueryOpenOrders(ctx context.Context, symbol string) (orders []types.Order, err error) {
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if e.IsMargin {
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req := e.Client.NewListMarginOpenOrdersService().Symbol(symbol)
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req.IsIsolated(e.IsIsolatedMargin)
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binanceOrders, err := req.Do(ctx)
if err != nil {
return orders, err
}
return toGlobalOrders(binanceOrders)
}
binanceOrders, err := e.Client.NewListOpenOrdersService().Symbol(symbol).Do(ctx)
if err != nil {
return orders, err
}
return toGlobalOrders(binanceOrders)
}
func (e *Exchange) QueryClosedOrders(ctx context.Context, symbol string, since, until time.Time, lastOrderID uint64) (orders []types.Order, err error) {
if until.Sub(since) >= 24*time.Hour {
until = since.Add(24*time.Hour - time.Millisecond)
}
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log.Infof("querying closed orders %s from %s <=> %s ...", symbol, since, until)
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if e.IsMargin {
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req := e.Client.NewListMarginOrdersService().Symbol(symbol)
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req.IsIsolated(e.IsIsolatedMargin)
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if lastOrderID > 0 {
req.OrderID(int64(lastOrderID))
} else {
req.StartTime(since.UnixNano() / int64(time.Millisecond)).
EndTime(until.UnixNano() / int64(time.Millisecond))
}
binanceOrders, err := req.Do(ctx)
if err != nil {
return orders, err
}
return toGlobalOrders(binanceOrders)
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}
req := e.Client.NewListOrdersService().
Symbol(symbol)
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if lastOrderID > 0 {
req.OrderID(int64(lastOrderID))
} else {
req.StartTime(since.UnixNano() / int64(time.Millisecond)).
EndTime(until.UnixNano() / int64(time.Millisecond))
}
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binanceOrders, err := req.Do(ctx)
if err != nil {
return orders, err
}
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return toGlobalOrders(binanceOrders)
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}
func (e *Exchange) CancelOrders(ctx context.Context, orders ...types.Order) (err2 error) {
for _, o := range orders {
var req = e.Client.NewCancelOrderService()
// Mandatory
req.Symbol(o.Symbol)
if o.OrderID > 0 {
req.OrderID(int64(o.OrderID))
} else if len(o.ClientOrderID) > 0 {
req.NewClientOrderID(o.ClientOrderID)
}
_, err := req.Do(ctx)
if err != nil {
log.WithError(err).Errorf("order cancel error")
err2 = err
}
}
return err2
}
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func (e *Exchange) submitMarginOrder(ctx context.Context, order types.SubmitOrder) (*types.Order, error) {
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orderType, err := toLocalOrderType(order.Type)
if err != nil {
return nil, err
}
req := e.Client.NewCreateMarginOrderService().
Symbol(order.Symbol).
Type(orderType).
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Side(binance.SideType(order.Side))
clientOrderID := newSpotClientOrderID(order.ClientOrderID)
if len(clientOrderID) > 0 {
req.NewClientOrderID(clientOrderID)
}
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// use response result format
req.NewOrderRespType(binance.NewOrderRespTypeRESULT)
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if e.IsIsolatedMargin {
req.IsIsolated(e.IsIsolatedMargin)
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}
if len(order.MarginSideEffect) > 0 {
req.SideEffectType(binance.SideEffectType(order.MarginSideEffect))
}
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if len(order.QuantityString) > 0 {
req.Quantity(order.QuantityString)
} else if order.Market.Symbol != "" {
req.Quantity(order.Market.FormatQuantity(order.Quantity))
} else {
req.Quantity(strconv.FormatFloat(order.Quantity, 'f', 8, 64))
}
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// set price field for limit orders
switch order.Type {
case types.OrderTypeStopLimit, types.OrderTypeLimit:
if len(order.PriceString) > 0 {
req.Price(order.PriceString)
} else if order.Market.Symbol != "" {
req.Price(order.Market.FormatPrice(order.Price))
}
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}
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// set stop price
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switch order.Type {
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case types.OrderTypeStopLimit, types.OrderTypeStopMarket:
if len(order.StopPriceString) == 0 {
return nil, fmt.Errorf("stop price string can not be empty")
}
req.StopPrice(order.StopPriceString)
}
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// could be IOC or FOK
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if len(order.TimeInForce) > 0 {
// TODO: check the TimeInForce value
req.TimeInForce(binance.TimeInForceType(order.TimeInForce))
} else {
switch order.Type {
case types.OrderTypeLimit, types.OrderTypeStopLimit:
req.TimeInForce(binance.TimeInForceTypeGTC)
}
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}
response, err := req.Do(ctx)
if err != nil {
return nil, err
}
log.Infof("margin order creation response: %+v", response)
createdOrder, err := toGlobalOrder(&binance.Order{
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Symbol: response.Symbol,
OrderID: response.OrderID,
ClientOrderID: response.ClientOrderID,
Price: response.Price,
OrigQuantity: response.OrigQuantity,
ExecutedQuantity: response.ExecutedQuantity,
CummulativeQuoteQuantity: response.CummulativeQuoteQuantity,
Status: response.Status,
TimeInForce: response.TimeInForce,
Type: response.Type,
Side: response.Side,
UpdateTime: response.TransactTime,
Time: response.TransactTime,
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IsIsolated: response.IsIsolated,
}, true)
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return createdOrder, err
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}
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// BBGO is a broker on Binance
const spotBrokerID = "NSUYEBKM"
func newSpotClientOrderID(originalID string) (clientOrderID string) {
if originalID == types.NoClientOrderID {
return ""
}
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prefix := "x-" + spotBrokerID
prefixLen := len(prefix)
if originalID != "" {
// try to keep the whole original client order ID if user specifies it.
if prefixLen+len(originalID) > 32 {
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return originalID
}
clientOrderID = prefix + originalID
return clientOrderID
}
clientOrderID = uuid.New().String()
clientOrderID = prefix + clientOrderID
if len(clientOrderID) > 32 {
return clientOrderID[0:32]
}
return clientOrderID
}
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func (e *Exchange) submitSpotOrder(ctx context.Context, order types.SubmitOrder) (*types.Order, error) {
orderType, err := toLocalOrderType(order.Type)
if err != nil {
return nil, err
}
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req := e.Client.NewCreateOrderService().
Symbol(order.Symbol).
Side(binance.SideType(order.Side)).
Type(orderType)
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clientOrderID := newSpotClientOrderID(order.ClientOrderID)
if len(clientOrderID) > 0 {
req.NewClientOrderID(clientOrderID)
}
if len(order.QuantityString) > 0 {
req.Quantity(order.QuantityString)
} else if order.Market.Symbol != "" {
req.Quantity(order.Market.FormatQuantity(order.Quantity))
} else {
req.Quantity(strconv.FormatFloat(order.Quantity, 'f', 8, 64))
}
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// set price field for limit orders
switch order.Type {
case types.OrderTypeStopLimit, types.OrderTypeLimit:
if len(order.PriceString) > 0 {
req.Price(order.PriceString)
} else if order.Market.Symbol != "" {
req.Price(order.Market.FormatPrice(order.Price))
}
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}
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switch order.Type {
case types.OrderTypeStopLimit, types.OrderTypeStopMarket:
if len(order.StopPriceString) == 0 {
return nil, fmt.Errorf("stop price string can not be empty")
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}
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req.StopPrice(order.StopPriceString)
}
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if len(order.TimeInForce) > 0 {
// TODO: check the TimeInForce value
req.TimeInForce(binance.TimeInForceType(order.TimeInForce))
} else {
switch order.Type {
case types.OrderTypeLimit, types.OrderTypeStopLimit:
req.TimeInForce(binance.TimeInForceTypeGTC)
}
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}
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response, err := req.Do(ctx)
if err != nil {
return nil, err
}
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log.Infof("spot order creation response: %+v", response)
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createdOrder, err := toGlobalOrder(&binance.Order{
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Symbol: response.Symbol,
OrderID: response.OrderID,
ClientOrderID: response.ClientOrderID,
Price: response.Price,
OrigQuantity: response.OrigQuantity,
ExecutedQuantity: response.ExecutedQuantity,
CummulativeQuoteQuantity: response.CummulativeQuoteQuantity,
Status: response.Status,
TimeInForce: response.TimeInForce,
Type: response.Type,
Side: response.Side,
UpdateTime: response.TransactTime,
Time: response.TransactTime,
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IsIsolated: response.IsIsolated,
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// StopPrice:
// IcebergQuantity:
// UpdateTime:
// IsWorking: ,
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}, false)
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return createdOrder, err
}
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func (e *Exchange) SubmitOrders(ctx context.Context, orders ...types.SubmitOrder) (createdOrders types.OrderSlice, err error) {
for _, order := range orders {
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var createdOrder *types.Order
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if e.IsMargin {
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createdOrder, err = e.submitMarginOrder(ctx, order)
} else {
createdOrder, err = e.submitSpotOrder(ctx, order)
}
if err != nil {
return createdOrders, err
}
if createdOrder == nil {
return createdOrders, errors.New("nil converted order")
}
createdOrders = append(createdOrders, *createdOrder)
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}
return createdOrders, err
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}
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// QueryKLines queries the Kline/candlestick bars for a symbol. Klines are uniquely identified by their open time.
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// Binance uses inclusive start time query range, eg:
// https://api.binance.com/api/v3/klines?symbol=BTCUSDT&interval=1m&startTime=1620172860000
// the above query will return a kline with startTime = 1620172860000
// and,
// https://api.binance.com/api/v3/klines?symbol=BTCUSDT&interval=1m&startTime=1620172860000&endTime=1620172920000
// the above query will return a kline with startTime = 1620172860000, and a kline with endTime = 1620172860000
//
// the endTime of a binance kline, is the (startTime + interval time - 1 millisecond), e.g.,
// millisecond unix timestamp: 1620172860000 and 1620172919999
func (e *Exchange) QueryKLines(ctx context.Context, symbol string, interval types.Interval, options types.KLineQueryOptions) ([]types.KLine, error) {
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var limit = 1000
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if options.Limit > 0 {
// default limit == 1000
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limit = options.Limit
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}
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log.Infof("querying kline %s %s %v", symbol, interval, options)
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req := e.Client.NewKlinesService().
Symbol(symbol).
Interval(string(interval)).
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Limit(limit)
if options.StartTime != nil {
req.StartTime(options.StartTime.UnixNano() / int64(time.Millisecond))
}
if options.EndTime != nil {
req.EndTime(options.EndTime.UnixNano() / int64(time.Millisecond))
}
resp, err := req.Do(ctx)
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if err != nil {
return nil, err
}
var kLines []types.KLine
for _, k := range resp {
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kLines = append(kLines, types.KLine{
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Exchange: types.ExchangeBinance,
Symbol: symbol,
Interval: interval,
StartTime: time.Unix(0, k.OpenTime*int64(time.Millisecond)),
EndTime: time.Unix(0, k.CloseTime*int64(time.Millisecond)),
Open: util.MustParseFloat(k.Open),
Close: util.MustParseFloat(k.Close),
High: util.MustParseFloat(k.High),
Low: util.MustParseFloat(k.Low),
Volume: util.MustParseFloat(k.Volume),
QuoteVolume: util.MustParseFloat(k.QuoteAssetVolume),
TakerBuyBaseAssetVolume: util.MustParseFloat(k.TakerBuyBaseAssetVolume),
TakerBuyQuoteAssetVolume: util.MustParseFloat(k.TakerBuyQuoteAssetVolume),
LastTradeID: 0,
NumberOfTrades: uint64(k.TradeNum),
Closed: true,
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})
}
return kLines, nil
}
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func (e *Exchange) QueryTrades(ctx context.Context, symbol string, options *types.TradeQueryOptions) (trades []types.Trade, err error) {
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var remoteTrades []*binance.TradeV3
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if e.IsMargin {
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req := e.Client.NewListMarginTradesService().
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IsIsolated(e.IsIsolatedMargin).
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Symbol(symbol)
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if options.Limit > 0 {
req.Limit(int(options.Limit))
} else {
req.Limit(1000)
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}
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if options.StartTime != nil {
req.StartTime(options.StartTime.UnixNano() / int64(time.Millisecond))
}
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if options.EndTime != nil {
req.EndTime(options.EndTime.UnixNano() / int64(time.Millisecond))
}
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// BINANCE uses inclusive last trade ID
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if options.LastTradeID > 0 {
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req.FromID(options.LastTradeID)
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}
remoteTrades, err = req.Do(ctx)
if err != nil {
return nil, err
}
} else {
req := e.Client.NewListTradesService().
Symbol(symbol)
if options.Limit > 0 {
req.Limit(int(options.Limit))
} else {
req.Limit(1000)
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}
if options.StartTime != nil {
req.StartTime(options.StartTime.UnixNano() / int64(time.Millisecond))
}
if options.EndTime != nil {
req.EndTime(options.EndTime.UnixNano() / int64(time.Millisecond))
}
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// BINANCE uses inclusive last trade ID
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if options.LastTradeID > 0 {
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req.FromID(options.LastTradeID)
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}
remoteTrades, err = req.Do(ctx)
if err != nil {
return nil, err
}
}
for _, t := range remoteTrades {
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localTrade, err := ToGlobalTrade(*t, e.IsMargin)
if err != nil {
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log.WithError(err).Errorf("can not convert binance trade: %+v", t)
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continue
}
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trades = append(trades, *localTrade)
}
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return trades, nil
}
func (e *Exchange) BatchQueryKLines(ctx context.Context, symbol string, interval types.Interval, startTime, endTime time.Time) ([]types.KLine, error) {
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var allKLines []types.KLine
for startTime.Before(endTime) {
klines, err := e.QueryKLines(ctx, symbol, interval, types.KLineQueryOptions{
StartTime: &startTime,
Limit: 1000,
})
if err != nil {
return nil, err
}
for _, kline := range klines {
if kline.EndTime.After(endTime) {
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return allKLines, nil
}
allKLines = append(allKLines, kline)
startTime = kline.EndTime
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}
}
return allKLines, nil
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}
func (e *Exchange) QueryLastFundingRate(ctx context.Context, symbol string) (fixedpoint.Value, error) {
futuresClient := binance.NewFuturesClient(e.key, e.secret)
rates, err := futuresClient.NewFundingRateService().
Symbol(symbol).
Limit(1).
Do(ctx)
if err != nil {
return 0, err
}
if len(rates) == 0 {
return 0, errors.New("empty funding rate data")
}
return fixedpoint.NewFromString(rates[0].FundingRate)
}