Merge pull request #1104 from c9s/narumi/rebalance/balance

fix: rebalance: adjust max amount by balance

config/rebalance.yaml

@@ -39,3 +39,4 @@ exchangeStrategies:
       maxAmount: 1_000 # max amount to buy or sell per order
       orderType: LIMIT_MAKER # LIMIT, LIMIT_MAKER or MARKET
       dryRun: false
+      onStart: false

pkg/strategy/rebalance/order_executor_map.go

@@ -55,7 +55,7 @@ func (m GeneralOrderExecutorMap) SubmitOrders(ctx context.Context, submitOrders
 			return nil, fmt.Errorf("order executor not found for symbol %s", submitOrder.Symbol)
 		}
 
-		createdOrders, err := orderExecutor.SubmitOrders(ctx)
+		createdOrders, err := orderExecutor.SubmitOrders(ctx, submitOrder)
 		if err != nil {
 			return nil, err
 		}

pkg/strategy/rebalance/strategy.go

@@ -34,6 +34,7 @@ type Strategy struct {
 	MaxAmount     fixedpoint.Value `json:"maxAmount"` // max amount to buy or sell per order
 	OrderType     types.OrderType  `json:"orderType"`
 	DryRun        bool             `json:"dryRun"`
+	OnStart       bool             `json:"onStart"` // rebalance on start
 
 	PositionMap    PositionMap    `persistence:"positionMap"`
 	ProfitStatsMap ProfitStatsMap `persistence:"profitStatsMap"`
@@ -114,6 +115,12 @@ func (s *Strategy) Run(ctx context.Context, _ bbgo.OrderExecutor, session *bbgo.
 	s.activeOrderBook = bbgo.NewActiveOrderBook("")
 	s.activeOrderBook.BindStream(s.session.UserDataStream)
 
+	session.UserDataStream.OnStart(func() {
+		if s.OnStart {
+			s.rebalance(ctx)
+		}
+	})
+
 	s.session.MarketDataStream.OnKLineClosed(func(kline types.KLine) {
 		s.rebalance(ctx)
 	})
@@ -133,12 +140,17 @@ func (s *Strategy) rebalance(ctx context.Context) {
 		log.WithError(err).Errorf("failed to cancel orders")
 	}
 
-	submitOrders := s.generateSubmitOrders(ctx)
+	submitOrders, err := s.generateSubmitOrders(ctx)
+	if err != nil {
+		log.WithError(err).Error("failed to generate submit orders")
+		return
+	}
 	for _, order := range submitOrders {
 		log.Infof("generated submit order: %s", order.String())
 	}
 
 	if s.DryRun {
+		log.Infof("dry run, not submitting orders")
 		return
 	}
 
@@ -150,7 +162,7 @@ func (s *Strategy) rebalance(ctx context.Context) {
 	s.activeOrderBook.Add(createdOrders...)
 }
 
-func (s *Strategy) prices(ctx context.Context) types.ValueMap {
+func (s *Strategy) prices(ctx context.Context) (types.ValueMap, error) {
 	m := make(types.ValueMap)
 	for currency := range s.TargetWeights {
 		if currency == s.QuoteCurrency {
@@ -160,29 +172,37 @@ func (s *Strategy) prices(ctx context.Context) types.ValueMap {
 
 		ticker, err := s.session.Exchange.QueryTicker(ctx, currency+s.QuoteCurrency)
 		if err != nil {
-			log.WithError(err).Error("failed to query tickers")
+			return nil, err
-			return nil
 		}
 
-		m[currency] = ticker.Last
+		m[currency] = ticker.Buy.Add(ticker.Sell).Div(fixedpoint.NewFromFloat(2.0))
 	}
-	return m
+	return m, nil
 }
 
-func (s *Strategy) quantities() types.ValueMap {
+func (s *Strategy) balances() (types.BalanceMap, error) {
-	m := make(types.ValueMap)
+	m := make(types.BalanceMap)
-
 	balances := s.session.GetAccount().Balances()
 	for currency := range s.TargetWeights {
-		m[currency] = balances[currency].Total()
+		balance, ok := balances[currency]
+		if !ok {
+			return nil, fmt.Errorf("no balance for %s", currency)
 		}
-
+		m[currency] = balance
-	return m
+	}
+	return m, nil
 }
 
-func (s *Strategy) generateSubmitOrders(ctx context.Context) (submitOrders []types.SubmitOrder) {
+func (s *Strategy) generateSubmitOrders(ctx context.Context) (submitOrders []types.SubmitOrder, err error) {
-	prices := s.prices(ctx)
+	prices, err := s.prices(ctx)
-	marketValues := prices.Mul(s.quantities())
+	if err != nil {
+		return nil, err
+	}
+	balances, err := s.balances()
+	if err != nil {
+		return nil, err
+	}
+	marketValues := prices.Mul(balanceToTotal(balances))
 	currentWeights := marketValues.Normalize()
 
 	for currency, targetWeight := range s.TargetWeights {
@@ -221,8 +241,9 @@ func (s *Strategy) generateSubmitOrders(ctx context.Context) (submitOrders []typ
 			quantity = quantity.Abs()
 		}
 
-		if s.MaxAmount.Sign() > 0 {
+		maxAmount := s.adjustMaxAmountByBalance(side, currency, currentPrice, balances)
-			quantity = bbgo.AdjustQuantityByMaxAmount(quantity, currentPrice, s.MaxAmount)
+		if maxAmount.Sign() > 0 {
+			quantity = bbgo.AdjustQuantityByMaxAmount(quantity, currentPrice, maxAmount)
 			log.Infof("adjust the quantity %v (%s %s @ %v) by max amount %v",
 				quantity,
 				symbol,
@@ -241,10 +262,12 @@ func (s *Strategy) generateSubmitOrders(ctx context.Context) (submitOrders []typ
 			Price:    currentPrice,
 		}
 
+		if ok := s.checkMinimalOrderQuantity(order); ok {
 			submitOrders = append(submitOrders, order)
 		}
+	}
 
-	return submitOrders
+	return submitOrders, err
 }
 
 func (s *Strategy) symbols() (symbols []string) {
@@ -268,3 +291,44 @@ func (s *Strategy) markets() ([]types.Market, error) {
 	}
 	return markets, nil
 }
+
+func (s *Strategy) adjustMaxAmountByBalance(side types.SideType, currency string, currentPrice fixedpoint.Value, balances types.BalanceMap) fixedpoint.Value {
+	var maxAmount fixedpoint.Value
+
+	switch side {
+	case types.SideTypeBuy:
+		maxAmount = balances[s.QuoteCurrency].Available
+	case types.SideTypeSell:
+		maxAmount = balances[currency].Available.Mul(currentPrice)
+	default:
+		log.Errorf("unknown side type: %s", side)
+		return fixedpoint.Zero
+	}
+
+	if s.MaxAmount.Sign() > 0 {
+		maxAmount = fixedpoint.Min(s.MaxAmount, maxAmount)
+	}
+
+	return maxAmount
+}
+
+func (s *Strategy) checkMinimalOrderQuantity(order types.SubmitOrder) bool {
+	if order.Quantity.Compare(order.Market.MinQuantity) < 0 {
+		log.Infof("order quantity is too small: %f < %f", order.Quantity.Float64(), order.Market.MinQuantity.Float64())
+		return false
+	}
+
+	if order.Quantity.Mul(order.Price).Compare(order.Market.MinNotional) < 0 {
+		log.Infof("order min notional is too small: %f < %f", order.Quantity.Mul(order.Price).Float64(), order.Market.MinNotional.Float64())
+		return false
+	}
+	return true
+}
+
+func balanceToTotal(balances types.BalanceMap) types.ValueMap {
+	m := make(types.ValueMap)
+	for _, b := range balances {
+		m[b.Currency] = b.Total()
+	}
+	return m
+}