72 lines
1.4 KiB
Go
72 lines
1.4 KiB
Go
package indicatorv2
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import (
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"git.qtrade.icu/lychiyu/bbgo/pkg/types"
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)
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type PriceStream struct {
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*types.Float64Series
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mapper types.KLineValueMapper
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}
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func Price(source KLineSubscription, mapper types.KLineValueMapper) *PriceStream {
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s := &PriceStream{
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Float64Series: types.NewFloat64Series(),
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mapper: mapper,
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}
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if source == nil {
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return s
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}
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source.AddSubscriber(func(k types.KLine) {
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v := s.mapper(k)
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s.PushAndEmit(v)
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})
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return s
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}
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// AddSubscriber adds the subscriber function and push historical data to the subscriber
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func (s *PriceStream) AddSubscriber(f func(v float64)) {
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s.OnUpdate(f)
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if len(s.Slice) == 0 {
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return
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}
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// push historical value to the subscriber
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for _, v := range s.Slice {
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f(v)
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}
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}
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func (s *PriceStream) PushAndEmit(v float64) {
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s.Slice.Push(v)
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s.EmitUpdate(v)
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}
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func ClosePrices(source KLineSubscription) *PriceStream {
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return Price(source, types.KLineClosePriceMapper)
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}
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func LowPrices(source KLineSubscription) *PriceStream {
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return Price(source, types.KLineLowPriceMapper)
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}
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func HighPrices(source KLineSubscription) *PriceStream {
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return Price(source, types.KLineHighPriceMapper)
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}
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func OpenPrices(source KLineSubscription) *PriceStream {
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return Price(source, types.KLineOpenPriceMapper)
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}
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func Volumes(source KLineSubscription) *PriceStream {
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return Price(source, types.KLineVolumeMapper)
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}
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func HLC3(source KLineSubscription) *PriceStream {
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return Price(source, types.KLineHLC3Mapper)
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}
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