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S3.go
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S3.go
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package fmaker
import (
"fmt"
"time"
"github.com/c9s/bbgo/pkg/datatype/floats"
"github.com/c9s/bbgo/pkg/indicator"
"github.com/c9s/bbgo/pkg/types"
)
//go:generate callbackgen -type S3
type S3 struct {
types.IntervalWindow
// Values
Values floats.Slice
EndTime time.Time
UpdateCallbacks []func(val float64)
}
func (inc *S3) Last(int) float64 {
if len(inc.Values) == 0 {
return 0.0
}
return inc.Values[len(inc.Values)-1]
}
func (inc *S3) CalculateAndUpdate(klines []types.KLine) {
if len(klines) < inc.Window {
return
}
var end = len(klines) - 1
var lastKLine = klines[end]
if inc.EndTime != zeroTime && lastKLine.GetEndTime().Before(inc.EndTime) {
return
}
var recentT = klines[end-(inc.Window-1) : end+1]
val, err := calculateS3(recentT, indicator.KLineClosePriceMapper, indicator.KLineOpenPriceMapper)
if err != nil {
log.WithError(err).Error("can not calculate")
return
}
inc.Values.Push(val)
if len(inc.Values) > indicator.MaxNumOfVOL {
inc.Values = inc.Values[indicator.MaxNumOfVOLTruncateSize-1:]
}
inc.EndTime = klines[end].GetEndTime().Time()
inc.EmitUpdate(val)
}
func (inc *S3) handleKLineWindowUpdate(interval types.Interval, window types.KLineWindow) {
if inc.Interval != interval {
return
}
inc.CalculateAndUpdate(window)
}
func (inc *S3) Bind(updater indicator.KLineWindowUpdater) {
updater.OnKLineWindowUpdate(inc.handleKLineWindowUpdate)
}
func calculateS3(klines []types.KLine, valClose KLineValueMapper, valOpen KLineValueMapper) (float64, error) {
window := 2
length := len(klines)
if length == 0 || length < window {
return 0., fmt.Errorf("insufficient elements for calculating with window = %d", window)
}
var closes floats.Slice
var opens floats.Slice
for _, k := range klines {
closes.Push(valClose(k))
opens.Push(valOpen(k))
}
prevC := closes.Index(1)
currO := opens.Index(0)
alpha := currO / prevC
return alpha, nil
}