bbgo_origin/pkg/strategy/pivotshort/breaklow.go

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package pivotshort
import (
"context"
"github.com/c9s/bbgo/pkg/bbgo"
"github.com/c9s/bbgo/pkg/fixedpoint"
"github.com/c9s/bbgo/pkg/indicator"
"github.com/c9s/bbgo/pkg/types"
)
type FakeBreakStop struct {
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types.IntervalWindow
}
// BreakLow -- when price breaks the previous pivot low, we set a trade entry
type BreakLow struct {
Symbol string
Market types.Market
types.IntervalWindow
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// FastWindow is used for fast pivot (this is to to filter the nearest high/low)
FastWindow int `json:"fastWindow"`
// Ratio is a number less than 1.0, price * ratio will be the price triggers the short order.
Ratio fixedpoint.Value `json:"ratio"`
bbgo.OpenPositionOptions
// BounceRatio is a ratio used for placing the limit order sell price
// limit sell price = breakLowPrice * (1 + BounceRatio)
BounceRatio fixedpoint.Value `json:"bounceRatio"`
StopEMA *bbgo.StopEMA `json:"stopEMA"`
TrendEMA *bbgo.TrendEMA `json:"trendEMA"`
FakeBreakStop *FakeBreakStop `json:"fakeBreakStop"`
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lastLow, lastFastLow fixedpoint.Value
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lastLowInvalidated bool
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// lastBreakLow is the low that the price just break
lastBreakLow fixedpoint.Value
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pivotLow, fastPivotLow *indicator.PivotLow
pivotLowPrices []fixedpoint.Value
orderExecutor *bbgo.GeneralOrderExecutor
session *bbgo.ExchangeSession
// StrategyController
bbgo.StrategyController
}
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func (s *BreakLow) Subscribe(session *bbgo.ExchangeSession) {
session.Subscribe(types.KLineChannel, s.Symbol, types.SubscribeOptions{Interval: s.Interval})
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session.Subscribe(types.KLineChannel, s.Symbol, types.SubscribeOptions{Interval: types.Interval1m})
if s.StopEMA != nil {
session.Subscribe(types.KLineChannel, s.Symbol, types.SubscribeOptions{Interval: s.StopEMA.Interval})
}
if s.TrendEMA != nil {
session.Subscribe(types.KLineChannel, s.Symbol, types.SubscribeOptions{Interval: s.TrendEMA.Interval})
}
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if s.FakeBreakStop != nil {
session.Subscribe(types.KLineChannel, s.Symbol, types.SubscribeOptions{Interval: s.FakeBreakStop.Interval})
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}
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}
func (s *BreakLow) Bind(session *bbgo.ExchangeSession, orderExecutor *bbgo.GeneralOrderExecutor) {
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if s.FastWindow == 0 {
s.FastWindow = 3
}
s.session = session
s.orderExecutor = orderExecutor
// StrategyController
s.Status = types.StrategyStatusRunning
position := orderExecutor.Position()
symbol := position.Symbol
standardIndicator := session.StandardIndicatorSet(s.Symbol)
s.lastLow = fixedpoint.Zero
s.pivotLow = standardIndicator.PivotLow(s.IntervalWindow)
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s.fastPivotLow = standardIndicator.PivotLow(types.IntervalWindow{
Interval: s.Interval,
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Window: s.FastWindow, // make it faster
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})
if s.StopEMA != nil {
s.StopEMA.Bind(session, orderExecutor)
}
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if s.TrendEMA != nil {
s.TrendEMA.Bind(session, orderExecutor)
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}
// update pivot low data
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session.MarketDataStream.OnStart(func() {
if s.updatePivotLow() {
bbgo.Notify("%s new pivot low: %f", s.Symbol, s.pivotLow.Last())
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}
s.pilotQuantityCalculation()
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})
session.MarketDataStream.OnKLineClosed(types.KLineWith(symbol, s.Interval, func(kline types.KLine) {
if s.updatePivotLow() {
// when position is opened, do not send pivot low notify
if position.IsOpened(kline.Close) {
return
}
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bbgo.Notify("%s new pivot low: %f", s.Symbol, s.pivotLow.Last())
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}
}))
if s.FakeBreakStop != nil {
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// if the position is already opened, and we just break the low, this checks if the kline closed above the low,
// so that we can close the position earlier
session.MarketDataStream.OnKLineClosed(types.KLineWith(s.Symbol, s.FakeBreakStop.Interval, func(k types.KLine) {
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// make sure the position is opened, and it's a short position
if !position.IsOpened(k.Close) || !position.IsShort() {
return
}
// make sure we recorded the last break low
if s.lastBreakLow.IsZero() {
return
}
// the kline opened below the last break low, and closed above the last break low
if k.Open.Compare(s.lastBreakLow) < 0 && k.Close.Compare(s.lastBreakLow) > 0 {
bbgo.Notify("kLine closed above the last break low, triggering stop earlier")
if err := s.orderExecutor.ClosePosition(context.Background(), one, "fakeBreakStop"); err != nil {
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log.WithError(err).Error("position close error")
}
// reset to zero
s.lastBreakLow = fixedpoint.Zero
}
}))
}
session.MarketDataStream.OnKLineClosed(types.KLineWith(s.Symbol, types.Interval1m, func(kline types.KLine) {
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if len(s.pivotLowPrices) == 0 || s.lastLow.IsZero() {
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log.Infof("currently there is no pivot low prices, can not check break low...")
return
}
if s.lastLowInvalidated {
log.Infof("the last low is invalidated, skip")
return
}
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previousLow := s.lastLow
ratio := fixedpoint.One.Add(s.Ratio)
breakPrice := previousLow.Mul(ratio)
// StrategyController
if s.Status != types.StrategyStatusRunning {
return
}
openPrice := kline.Open
closePrice := kline.Close
// if the previous low is not break, or the kline is not strong enough to break it, skip
if closePrice.Compare(breakPrice) >= 0 {
return
}
// we need the price cross the break line, or we do nothing:
// 1) open > break price > close price
// 2) high > break price > open price and close price
// v2
if !((openPrice.Compare(breakPrice) > 0 && closePrice.Compare(breakPrice) < 0) ||
(kline.High.Compare(breakPrice) > 0 && openPrice.Compare(breakPrice) < 0 && closePrice.Compare(breakPrice) < 0)) {
return
}
// force direction to be down
if closePrice.Compare(openPrice) >= 0 {
bbgo.Notify("%s price %f is closed higher than the open price %f, skip this break", kline.Symbol, closePrice.Float64(), openPrice.Float64())
// skip UP klines
return
}
bbgo.Notify("%s breakLow signal detected, closed price %f < breakPrice %f", kline.Symbol, closePrice.Float64(), breakPrice.Float64(), kline)
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if s.lastBreakLow.IsZero() || previousLow.Compare(s.lastBreakLow) < 0 {
s.lastBreakLow = previousLow
}
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if position.IsOpened(kline.Close) {
bbgo.Notify("%s position is already opened, skip", s.Symbol)
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return
}
// trend EMA protection
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if s.TrendEMA != nil && !s.TrendEMA.GradientAllowed() {
bbgo.Notify("trendEMA protection: %s close price %f, gradient %f", s.Symbol, kline.Close.Float64(), s.TrendEMA.Gradient())
return
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}
// stop EMA protection
if s.StopEMA != nil {
if !s.StopEMA.Allowed(closePrice) {
return
}
}
ctx := context.Background()
// graceful cancel all active orders
_ = orderExecutor.GracefulCancel(ctx)
bbgo.Notify("%s price %f breaks the previous low %f with ratio %f, opening short position", symbol, kline.Close.Float64(), previousLow.Float64(), s.Ratio.Float64())
opts := s.OpenPositionOptions
opts.Short = true
opts.Price = closePrice
opts.Tags = []string{"breakLowMarket"}
if opts.LimitOrder && !s.BounceRatio.IsZero() {
opts.Price = previousLow.Mul(fixedpoint.One.Add(s.BounceRatio))
}
if _, err := s.orderExecutor.OpenPosition(ctx, opts); err != nil {
log.WithError(err).Errorf("failed to open short position")
}
}))
}
func (s *BreakLow) pilotQuantityCalculation() {
if s.lastLow.IsZero() {
return
}
log.Infof("pilot calculation for max position: last low = %f, quantity = %f, leverage = %f",
s.lastLow.Float64(),
s.Quantity.Float64(),
s.Leverage.Float64())
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quantity, err := bbgo.CalculateBaseQuantity(s.session, s.Market, s.lastLow, s.Quantity, s.Leverage)
if err != nil {
log.WithError(err).Errorf("quantity calculation error")
}
if quantity.IsZero() {
log.WithError(err).Errorf("quantity is zero, can not submit order")
return
}
bbgo.Notify("%s %f quantity will be used for shorting", s.Symbol, quantity.Float64())
}
func (s *BreakLow) updatePivotLow() bool {
low := fixedpoint.NewFromFloat(s.pivotLow.Last())
if low.IsZero() {
return false
}
// if the last low is different
lastLowChanged := low.Compare(s.lastLow) != 0
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if lastLowChanged {
s.lastLow = low
s.lastLowInvalidated = false
s.pivotLowPrices = append(s.pivotLowPrices, low)
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}
fastLow := fixedpoint.NewFromFloat(s.fastPivotLow.Last())
if !fastLow.IsZero() {
if fastLow.Compare(s.lastLow) < 0 {
s.lastLowInvalidated = true
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lastLowChanged = false
}
s.lastFastLow = fastLow
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}
return lastLowChanged
}