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xmaker: truncate quantity when hedging

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This commit is contained in:
c9s 2021-12-26 15:44:41 +08:00
parent 05a0745d08
commit 902e27ede4
2 changed files with 15 additions and 6 deletions
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1
pkg/strategy/xmaker/strategy.go
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@ -501,6 +501,7 @@ func (s *Strategy) Hedge(ctx context.Context, pos fixedpoint.Value) {
}
quantity := fixedpoint.Abs(pos)
quantity = s.sourceMarket.TruncateQuantity(quantity)
if pos < 0 {
side = types.SideTypeSell

8
pkg/types/market.go
View File

@ -8,6 +8,8 @@ import (
"time"
"github.com/leekchan/accounting"
"github.com/c9s/bbgo/pkg/fixedpoint"
)
type Duration time.Duration
@ -93,6 +95,12 @@ type Market struct {
TickSize float64 `json:"tickSize,omitempty"`
}
// TruncateQuantity uses the step size to truncate floating number, in order to avoid the rounding issue
func (m Market) TruncateQuantity(quantity fixedpoint.Value) fixedpoint.Value {
stepRound := math.Pow10(-int(math.Log10(m.StepSize)))
return fixedpoint.NewFromFloat(math.Trunc(quantity.Float64()*stepRound) / stepRound)
}
func (m Market) BaseCurrencyFormatter() *accounting.Accounting {
a := accounting.DefaultAccounting(m.BaseCurrency, m.VolumePrecision)
a.Format = "%v %s"