75 lines
1.8 KiB
Go
75 lines
1.8 KiB
Go
// package bybit provides rates of cryptocurrencies from bybit exchange orderbook.
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package bybit
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import (
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"context"
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"fmt"
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"log/slog"
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"net/http"
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"time"
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"gitea.computernetthings.ru/yash/crypto_alert_bot/internal/config"
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"gitea.computernetthings.ru/yash/crypto_alert_bot/internal/entities"
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"gitea.computernetthings.ru/yash/crypto_alert_bot/internal/provider"
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"github.com/shopspring/decimal"
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)
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const (
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// mainnetURL = "https://api.bybit.com"
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httpTimeout = time.Second * 10
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)
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type Bybit struct {
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log *slog.Logger
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cfg *config.Bybit
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client *http.Client
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}
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func New(log *slog.Logger, cfg *config.Bybit) provider.Provider {
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return &Bybit{
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log: log,
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cfg: cfg,
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client: &http.Client{
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Timeout: httpTimeout,
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},
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}
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}
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func (b *Bybit) symbol(pair *entities.Instrument) string {
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return fmt.Sprintf("%s%s", pair.BaseCurrency, pair.QuoteCurrency)
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}
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// Price returns the current price of the pair (base currency / quote currency).
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// e.g. BTC/USDT.
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func (b *Bybit) Price(ctx context.Context, instrument entities.Instrument) (*entities.Price, error) {
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// build request
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req := marketOrderbookReq{
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Category: categorySpot,
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Symbol: b.symbol(&instrument),
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}
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var resp marketOrderbookResp
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// make request
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err := b.makeRequest(ctx, http.MethodGet, "/v5/market/orderbook", req, &resp)
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if err != nil {
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return nil, fmt.Errorf("failed to make request: %w", err)
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}
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// get results
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if len(resp.A) == 0 || len(resp.B) == 0 {
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return nil, fmt.Errorf("incorrect response: nil data")
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}
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if len(resp.A[0]) != 2 || len(resp.B[0]) != 2 {
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return nil, fmt.Errorf("incorrect response: nil prices")
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}
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askPrice := decimal.RequireFromString(resp.A[0][0])
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bidPrice := decimal.RequireFromString(resp.B[0][0])
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spread := askPrice.Sub(bidPrice)
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return &entities.Price{
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Ask: askPrice,
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Bid: bidPrice,
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Spread: spread,
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Instrument: instrument,
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}, nil
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}
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