Claude/analyze us exchange g6 b kg

bex/entrys.go

@@ -8,6 +8,7 @@ import (
 	"github.com/banbox/banexg/errs"
 	"github.com/banbox/banexg/okx"
 	"github.com/banbox/banexg/utils"
+	"github.com/banbox/banexg/yahoo"
 )
 
 func init() {
@@ -16,6 +17,7 @@ func init() {
 		"bybit":   WrapNew(bybit.New),
 		"china":   china.NewExchange,
 		"okx":     okx.NewExchange,
+		"yahoo":   yahoo.NewExchange,
 	}
 }
 

yahoo/biz.go

@@ -0,0 +1,203 @@
+package yahoo
+
+import (
+	"context"
+	"strconv"
+	"strings"
+	"time"
+
+	"github.com/banbox/banexg"
+	"github.com/banbox/banexg/errs"
+	"github.com/banbox/banexg/utils"
+)
+
+func (e *Yahoo) Init() *errs.Error {
+	if err := e.Exchange.Init(); err != nil {
+		return err
+	}
+	if e.UserAgent == "" {
+		e.UserAgent = defaultUserAgent
+	}
+	e.TimeFrames = map[string]string{
+		"1m":  "1m",
+		"2m":  "2m",
+		"5m":  "5m",
+		"15m": "15m",
+		"30m": "30m",
+		"60m": "60m",
+		"1h":  "60m",
+		"1H":  "60m",
+		"90m": "90m",
+		// 4h has no native Yahoo interval; FetchOHLCV aggregates from 1h.
+		"4h":  "4h",
+		"4H":  "4h",
+		"1d":  "1d",
+		"1D":  "1d",
+		"5d":  "5d",
+		"1w":  "1wk",
+		"1W":  "1wk",
+		"1wk": "1wk",
+		"1mo": "1mo",
+		"1M":  "1mo",
+		"3mo": "3mo",
+	}
+	e.ExgInfo.Min1mHole = 1
+	e.MarketsLock.Lock()
+	if e.Markets == nil {
+		e.Markets = banexg.MarketMap{}
+	}
+	e.MarketsLock.Unlock()
+	e.MarketsByIdLock.Lock()
+	if e.MarketsById == nil {
+		e.MarketsById = banexg.MarketArrMap{}
+	}
+	e.MarketsByIdLock.Unlock()
+	return nil
+}
+
+// LoadMarkets is lazy: Yahoo has no "list all instruments" endpoint.
+// If params[ParamSymbols] is provided, build Market entries for those tickers;
+// otherwise return whatever has accumulated via earlier MapMarket calls.
+func (e *Yahoo) LoadMarkets(reload bool, params map[string]interface{}) (banexg.MarketMap, *errs.Error) {
+	var symbols []string
+	if params != nil {
+		symbols = coerceSymbols(params[banexg.ParamSymbols])
+	}
+	for _, s := range symbols {
+		e.registerMarket(buildMarket(s))
+	}
+	e.MarketsLock.Lock()
+	out := e.Markets
+	e.MarketsLock.Unlock()
+	return out, nil
+}
+
+// MapMarket builds a Market on demand for a Yahoo ticker.
+func (e *Yahoo) MapMarket(rawID string, year int) (*banexg.Market, *errs.Error) {
+	if rawID == "" {
+		return nil, errs.NewMsg(errs.CodeParamRequired, "symbol required")
+	}
+	if mar := e.GetMarketById(rawID, ""); mar != nil {
+		return mar, nil
+	}
+	m := buildMarket(rawID)
+	e.registerMarket(m)
+	return m, nil
+}
+
+func (e *Yahoo) registerMarket(m *banexg.Market) {
+	e.MarketsLock.Lock()
+	e.Markets[m.Symbol] = m
+	e.MarketsLock.Unlock()
+	e.MarketsByIdLock.Lock()
+	e.MarketsById[m.ID] = []*banexg.Market{m}
+	e.MarketsByIdLock.Unlock()
+}
+
+func (e *Yahoo) FetchOHLCV(symbol, timeframe string, since int64, limit int, params map[string]interface{}) ([]*banexg.Kline, *errs.Error) {
+	if symbol == "" {
+		return nil, errs.NewMsg(errs.CodeParamRequired, "symbol required")
+	}
+	interval := e.GetTimeFrame(timeframe)
+	if interval == "" {
+		return nil, errs.NewMsg(errs.CodeInvalidTimeFrame, "unsupported timeframe: %s", timeframe)
+	}
+	// 4h has no native Yahoo interval; fetch 1h and aggregate.
+	if interval == "4h" {
+		baseLimit := 0
+		if limit > 0 {
+			baseLimit = limit * 4
+		}
+		base, err := e.FetchOHLCV(symbol, "1h", since, baseLimit, params)
+		if err != nil {
+			return nil, err
+		}
+		out := aggregate(base, 4*60*60*1000)
+		if limit > 0 && len(out) > limit {
+			out = out[len(out)-limit:]
+		}
+		return out, nil
+	}
+	args := utils.SafeParams(params)
+	args["symbol"] = symbol
+	args[banexg.ParamInterval] = interval
+	args["events"] = "history"
+
+	until := utils.PopMapVal(args, banexg.ParamUntil, int64(0))
+	if since > 0 {
+		args["period1"] = strconv.FormatInt(since/1000, 10)
+		if until > 0 {
+			args["period2"] = strconv.FormatInt(until/1000, 10)
+		} else {
+			args["period2"] = strconv.FormatInt(time.Now().Unix(), 10)
+		}
+	} else {
+		args["range"] = chooseRange(interval, limit)
+	}
+
+	tryNum := e.GetRetryNum("FetchOHLCV", 1)
+	rsp := e.RequestApiRetry(context.Background(), MidChartGet, args, tryNum)
+	if rsp.Error != nil {
+		return nil, rsp.Error
+	}
+	klines, err := parseChart(rsp.Content)
+	if err != nil {
+		return nil, err
+	}
+	if limit > 0 && len(klines) > limit {
+		// Yahoo doesn't accept a `limit` parameter, so trim from the oldest end.
+		klines = klines[len(klines)-limit:]
+	}
+	return klines, nil
+}
+
+func (e *Yahoo) FetchTickers(symbols []string, params map[string]interface{}) ([]*banexg.Ticker, *errs.Error) {
+	if len(symbols) == 0 {
+		return nil, errs.NewMsg(errs.CodeParamRequired, "symbols required")
+	}
+	args := utils.SafeParams(params)
+	args["symbols"] = strings.Join(symbols, ",")
+
+	tryNum := e.GetRetryNum("FetchTickers", 1)
+	rsp := e.RequestApiRetry(context.Background(), MidQuoteGet, args, tryNum)
+	if rsp.Error != nil {
+		return nil, rsp.Error
+	}
+	return parseQuote(rsp.Content)
+}
+
+func (e *Yahoo) FetchTicker(symbol string, params map[string]interface{}) (*banexg.Ticker, *errs.Error) {
+	list, err := e.FetchTickers([]string{symbol}, params)
+	if err != nil {
+		return nil, err
+	}
+	if len(list) == 0 {
+		return nil, errs.NewMsg(errs.CodeDataNotFound, "no ticker for %s", symbol)
+	}
+	return list[0], nil
+}
+
+func (e *Yahoo) FetchTickerPrice(symbol string, params map[string]interface{}) (map[string]float64, *errs.Error) {
+	var symbols []string
+	if symbol == "" {
+		symbols = coerceSymbols(params[banexg.ParamSymbols])
+	} else {
+		symbols = []string{symbol}
+	}
+	if len(symbols) == 0 {
+		return nil, errs.NewMsg(errs.CodeParamRequired, "symbol(s) required")
+	}
+	list, err := e.FetchTickers(symbols, params)
+	if err != nil {
+		return nil, err
+	}
+	out := make(map[string]float64, len(list))
+	for _, t := range list {
+		out[t.Symbol] = t.Last
+	}
+	return out, nil
+}
+
+func (e *Yahoo) Close() *errs.Error {
+	return nil
+}