Merge pull request #1221 from c9s/feature/tri

FEATURE: add triangular arbitrate strategy as an example

config/tri.yaml

@@ -0,0 +1,35 @@
+---
+notifications:
+  slack:
+    defaultChannel: "dev-bbgo"
+    errorChannel: "bbgo-error"
+
+sessions:
+  binance:
+    exchange: binance
+    envVarPrefix: binance
+
+exchangeStrategies:
+
+## triangular arbitrage strategy
+- on: binance
+  tri:
+    minSpreadRatio: 1.0011
+    separateStream: true
+    # resetPosition: true
+    limits:
+      BTC: 0.001
+      ETH: 0.01
+      USDT: 20.0
+    symbols:
+    - BNBUSDT
+    - BNBBTC
+    - BNBETH
+    - BTCUSDT
+    - ETHUSDT
+    - ETHBTC
+    paths:
+    - [ BTCUSDT, ETHBTC, ETHUSDT ]
+    - [ BNBBTC, BNBUSDT, BTCUSDT ]
+    - [ BNBETH, BNBUSDT, ETHUSDT ]
+

pkg/bbgo/mocks/mock_order_executor_extended.go

@@ -5,12 +5,13 @@
 package mocks
 
 import (
-	context "context"
+	"context"
-	reflect "reflect"
+	"reflect"
 
-	bbgo "github.com/c9s/bbgo/pkg/bbgo"
+	"github.com/golang/mock/gomock"
-	types "github.com/c9s/bbgo/pkg/types"
+
-	gomock "github.com/golang/mock/gomock"
+	"github.com/c9s/bbgo/pkg/core"
+	"github.com/c9s/bbgo/pkg/types"
 )
 
 // MockOrderExecutorExtended is a mock of OrderExecutorExtended interface.
@@ -90,10 +91,10 @@ func (mr *MockOrderExecutorExtendedMockRecorder) SubmitOrders(arg0 interface{},
 }
 
 // TradeCollector mocks base method.
-func (m *MockOrderExecutorExtended) TradeCollector() *bbgo.TradeCollector {
+func (m *MockOrderExecutorExtended) TradeCollector() *core.TradeCollector {
 	m.ctrl.T.Helper()
 	ret := m.ctrl.Call(m, "TradeCollector")
-	ret0, _ := ret[0].(*bbgo.TradeCollector)
+	ret0, _ := ret[0].(*core.TradeCollector)
 	return ret0
 }
 

pkg/bbgo/order_execution.go

@@ -10,6 +10,7 @@ import (
 	log "github.com/sirupsen/logrus"
 	"go.uber.org/multierr"
 
+	"github.com/c9s/bbgo/pkg/core"
 	"github.com/c9s/bbgo/pkg/fixedpoint"
 	"github.com/c9s/bbgo/pkg/types"
 	"github.com/c9s/bbgo/pkg/util"
@@ -32,7 +33,7 @@ type OrderExecutor interface {
 type OrderExecutorExtended interface {
 	SubmitOrders(ctx context.Context, orders ...types.SubmitOrder) (createdOrders types.OrderSlice, err error)
 	CancelOrders(ctx context.Context, orders ...types.Order) error
-	TradeCollector() *TradeCollector
+	TradeCollector() *core.TradeCollector
 	Position() *types.Position
 }
 

pkg/bbgo/order_executor_general.go

@@ -35,7 +35,7 @@ type GeneralOrderExecutor struct {
 	position           *types.Position
 	activeMakerOrders  *ActiveOrderBook
 	orderStore         *core.OrderStore
-	tradeCollector     *TradeCollector
+	tradeCollector     *core.TradeCollector
 
 	logger log.FieldLogger
 
@@ -60,7 +60,7 @@ func NewGeneralOrderExecutor(session *ExchangeSession, symbol, strategy, strateg
 		position:           position,
 		activeMakerOrders:  NewActiveOrderBook(symbol),
 		orderStore:         orderStore,
-		tradeCollector:     NewTradeCollector(symbol, position, orderStore),
+		tradeCollector:     core.NewTradeCollector(symbol, position, orderStore),
 	}
 
 	if session != nil && session.Margin {
@@ -517,7 +517,7 @@ func (e *GeneralOrderExecutor) ClosePosition(ctx context.Context, percentage fix
 	return nil
 }
 
-func (e *GeneralOrderExecutor) TradeCollector() *TradeCollector {
+func (e *GeneralOrderExecutor) TradeCollector() *core.TradeCollector {
 	return e.tradeCollector
 }
 

pkg/cmd/backtest.go

@@ -308,7 +308,7 @@ var BacktestCmd = &cobra.Command{
 		var reportDir = outputDirectory
 		var sessionTradeStats = make(map[string]map[string]*types.TradeStats)
 
-		var tradeCollectorList []*bbgo.TradeCollector
+		var tradeCollectorList []*core.TradeCollector
 		for _, exSource := range exchangeSources {
 			sessionName := exSource.Session.Name
 			tradeStatsMap := make(map[string]*types.TradeStats)
@@ -317,7 +317,7 @@ var BacktestCmd = &cobra.Command{
 				position := types.NewPositionFromMarket(market)
 				orderStore := core.NewOrderStore(usedSymbol)
 				orderStore.AddOrderUpdate = true
-				tradeCollector := bbgo.NewTradeCollector(usedSymbol, position, orderStore)
+				tradeCollector := core.NewTradeCollector(usedSymbol, position, orderStore)
 
 				tradeStats := types.NewTradeStats(usedSymbol)
 				tradeStats.SetIntervalProfitCollector(types.NewIntervalProfitCollector(types.Interval1d, startTime))

pkg/core/orderstore.go

@@ -15,12 +15,14 @@ type OrderStore struct {
 	RemoveCancelled bool
 	RemoveFilled    bool
 	AddOrderUpdate  bool
+	C               chan types.Order
 }
 
 func NewOrderStore(symbol string) *OrderStore {
 	return &OrderStore{
 		Symbol: symbol,
 		orders: make(map[uint64]types.Order),
+		C:      make(chan types.Order),
 	}
 }
 
@@ -129,6 +131,7 @@ func (s *OrderStore) BindStream(stream types.Stream) {
 }
 
 func (s *OrderStore) HandleOrderUpdate(order types.Order) {
+
 	switch order.Status {
 
 	case types.OrderStatusNew, types.OrderStatusPartiallyFilled, types.OrderStatusFilled:
@@ -152,4 +155,9 @@ func (s *OrderStore) HandleOrderUpdate(order types.Order) {
 	case types.OrderStatusRejected:
 		s.Remove(order)
 	}
+
+	select {
+	case s.C <- order:
+	default:
+	}
 }

pkg/core/tradecollector.go

@@ -1,13 +1,12 @@
-package bbgo
+package core
 
 import (
 	"context"
 	"sync"
 	"time"
 
-	log "github.com/sirupsen/logrus"
+	"github.com/sirupsen/logrus"
 
-	"github.com/c9s/bbgo/pkg/core"
 	"github.com/c9s/bbgo/pkg/fixedpoint"
 	"github.com/c9s/bbgo/pkg/sigchan"
 	"github.com/c9s/bbgo/pkg/types"
@@ -18,10 +17,10 @@ type TradeCollector struct {
 	Symbol   string
 	orderSig sigchan.Chan
 
-	tradeStore *core.TradeStore
+	tradeStore *TradeStore
 	tradeC     chan types.Trade
 	position   *types.Position
-	orderStore *core.OrderStore
+	orderStore *OrderStore
 	doneTrades map[types.TradeKey]struct{}
 
 	mu sync.Mutex
@@ -34,13 +33,13 @@ type TradeCollector struct {
 	profitCallbacks         []func(trade types.Trade, profit *types.Profit)
 }
 
-func NewTradeCollector(symbol string, position *types.Position, orderStore *core.OrderStore) *TradeCollector {
+func NewTradeCollector(symbol string, position *types.Position, orderStore *OrderStore) *TradeCollector {
 	return &TradeCollector{
 		Symbol:   symbol,
 		orderSig: sigchan.New(1),
 
 		tradeC:     make(chan types.Trade, 100),
-		tradeStore: core.NewTradeStore(),
+		tradeStore: NewTradeStore(),
 		doneTrades: make(map[types.TradeKey]struct{}),
 		position:   position,
 		orderStore: orderStore,
@@ -48,7 +47,7 @@ func NewTradeCollector(symbol string, position *types.Position, orderStore *core
 }
 
 // OrderStore returns the order store used by the trade collector
-func (c *TradeCollector) OrderStore() *core.OrderStore {
+func (c *TradeCollector) OrderStore() *OrderStore {
 	return c.orderStore
 }
 
@@ -57,7 +56,7 @@ func (c *TradeCollector) Position() *types.Position {
 	return c.position
 }
 
-func (c *TradeCollector) TradeStore() *core.TradeStore {
+func (c *TradeCollector) TradeStore() *TradeStore {
 	return c.tradeStore
 }
 
@@ -99,9 +98,9 @@ func (c *TradeCollector) Recover(ctx context.Context, ex types.ExchangeTradeHist
 	}
 
 	for _, td := range trades {
-		log.Debugf("processing trade: %s", td.String())
+		logrus.Debugf("processing trade: %s", td.String())
 		if c.ProcessTrade(td) {
-			log.Infof("recovered trade: %s", td.String())
+			logrus.Infof("recovered trade: %s", td.String())
 			c.EmitRecover(td)
 		}
 	}

pkg/core/tradecollector_callbacks.go

@@ -1,6 +1,6 @@
 // Code generated by "callbackgen -type TradeCollector"; DO NOT EDIT.
 
-package bbgo
+package core
 
 import (
 	"github.com/c9s/bbgo/pkg/fixedpoint"

pkg/core/tradecollector_test.go

@@ -1,11 +1,10 @@
-package bbgo
+package core
 
 import (
 	"testing"
 
 	"github.com/stretchr/testify/assert"
 
-	"github.com/c9s/bbgo/pkg/core"
 	"github.com/c9s/bbgo/pkg/fixedpoint"
 	"github.com/c9s/bbgo/pkg/types"
 )
@@ -13,7 +12,7 @@ import (
 func TestTradeCollector_ShouldNotCountDuplicatedTrade(t *testing.T) {
 	symbol := "BTCUSDT"
 	position := types.NewPosition(symbol, "BTC", "USDT")
-	orderStore := core.NewOrderStore(symbol)
+	orderStore := NewOrderStore(symbol)
 	collector := NewTradeCollector(symbol, position, orderStore)
 	assert.NotNil(t, collector)
 

pkg/risk/riskcontrol/position_test.go

@@ -8,6 +8,7 @@ import (
 
 	"github.com/c9s/bbgo/pkg/bbgo"
 	"github.com/c9s/bbgo/pkg/bbgo/mocks"
+	"github.com/c9s/bbgo/pkg/core"
 	"github.com/c9s/bbgo/pkg/fixedpoint"
 	"github.com/c9s/bbgo/pkg/types"
 )
@@ -93,7 +94,7 @@ func TestReleasePositionCallbacks(t *testing.T) {
 				},
 			}
 
-			tradeCollector := &bbgo.TradeCollector{}
+			tradeCollector := &core.TradeCollector{}
 			mockCtrl := gomock.NewController(t)
 			defer mockCtrl.Finish()
 			orderExecutor := mocks.NewMockOrderExecutorExtended(mockCtrl)

pkg/strategy/fmaker/strategy.go

@@ -49,7 +49,7 @@ type Strategy struct {
 	// closePositionOrders *bbgo.LocalActiveOrderBook
 
 	orderStore     *core.OrderStore
-	tradeCollector *bbgo.TradeCollector
+	tradeCollector *core.TradeCollector
 
 	session *bbgo.ExchangeSession
 
@@ -174,7 +174,7 @@ func (s *Strategy) Run(ctx context.Context, orderExecutor bbgo.OrderExecutor, se
 	s.Position.Strategy = ID
 	s.Position.StrategyInstanceID = instanceID
 
-	s.tradeCollector = bbgo.NewTradeCollector(s.Symbol, s.Position, s.orderStore)
+	s.tradeCollector = core.NewTradeCollector(s.Symbol, s.Position, s.orderStore)
 	s.tradeCollector.OnTrade(func(trade types.Trade, profit, netProfit fixedpoint.Value) {
 		// StrategyController
 		if s.Status != types.StrategyStatusRunning {

pkg/strategy/grid/strategy.go

@@ -95,7 +95,7 @@ type Strategy struct {
 	// activeOrders is the locally maintained active order book of the maker orders.
 	activeOrders *bbgo.ActiveOrderBook
 
-	tradeCollector *bbgo.TradeCollector
+	tradeCollector *core.TradeCollector
 
 	// groupID is the group ID used for the strategy instance for canceling orders
 	groupID uint32
@@ -571,7 +571,7 @@ func (s *Strategy) Run(ctx context.Context, orderExecutor bbgo.OrderExecutor, se
 	s.activeOrders.OnFilled(s.handleFilledOrder)
 	s.activeOrders.BindStream(session.UserDataStream)
 
-	s.tradeCollector = bbgo.NewTradeCollector(s.Symbol, s.State.Position, s.orderStore)
+	s.tradeCollector = core.NewTradeCollector(s.Symbol, s.State.Position, s.orderStore)
 
 	s.tradeCollector.OnTrade(func(trade types.Trade, profit, netProfit fixedpoint.Value) {
 		bbgo.Notify(trade)

pkg/strategy/tri/market.go

@@ -0,0 +1,104 @@
+package tri
+
+import (
+	"fmt"
+
+	"github.com/c9s/bbgo/pkg/fixedpoint"
+	"github.com/c9s/bbgo/pkg/sigchan"
+	"github.com/c9s/bbgo/pkg/types"
+)
+
+type ArbMarket struct {
+	Symbol                      string
+	BaseCurrency, QuoteCurrency string
+	market                      types.Market
+
+	stream            types.Stream
+	book              *types.StreamOrderBook
+	bestBid, bestAsk  types.PriceVolume
+	buyRate, sellRate float64
+	sigC              sigchan.Chan
+}
+
+func (m *ArbMarket) String() string {
+	return m.Symbol
+}
+
+func (m *ArbMarket) getInitialBalance(balances types.BalanceMap, dir int) (fixedpoint.Value, string) {
+	if dir == 1 { // sell 1 BTC -> 19000 USDT
+		b, ok := balances[m.BaseCurrency]
+		if !ok {
+			return fixedpoint.Zero, m.BaseCurrency
+		}
+
+		return m.market.TruncateQuantity(b.Available), m.BaseCurrency
+	} else if dir == -1 {
+		b, ok := balances[m.QuoteCurrency]
+		if !ok {
+			return fixedpoint.Zero, m.QuoteCurrency
+		}
+
+		return m.market.TruncateQuantity(b.Available), m.QuoteCurrency
+	}
+
+	return fixedpoint.Zero, ""
+}
+
+func (m *ArbMarket) calculateRatio(dir int) float64 {
+	if dir == 1 { // direct 1 = sell
+		if m.bestBid.Price.IsZero() || m.bestBid.Volume.Compare(m.market.MinQuantity) <= 0 {
+			return 0.0
+		}
+
+		return m.sellRate
+	} else if dir == -1 {
+		if m.bestAsk.Price.IsZero() || m.bestAsk.Volume.Compare(m.market.MinQuantity) <= 0 {
+			return 0.0
+		}
+
+		return m.buyRate
+	}
+
+	return 0.0
+}
+
+func (m *ArbMarket) updateRate() {
+	m.buyRate = 1.0 / m.bestAsk.Price.Float64()
+	m.sellRate = m.bestBid.Price.Float64()
+
+	if m.bestBid.Volume.Compare(m.market.MinQuantity) <= 0 && m.bestAsk.Volume.Compare(m.market.MinQuantity) <= 0 {
+		return
+	}
+
+	m.sigC.Emit()
+}
+
+func (m *ArbMarket) newOrder(dir int, transitingQuantity float64) (types.SubmitOrder, float64) {
+	if dir == 1 { // sell ETH -> BTC, sell USDT -> TWD
+		q, r := fitQuantityByBase(m.market.TruncateQuantity(m.bestBid.Volume).Float64(), transitingQuantity)
+		fq := fixedpoint.NewFromFloat(q)
+		return types.SubmitOrder{
+			Symbol:   m.Symbol,
+			Side:     types.SideTypeSell,
+			Type:     types.OrderTypeLimit,
+			Quantity: fq,
+			Price:    m.bestBid.Price,
+			Market:   m.market,
+		}, r
+	} else if dir == -1 { // use 1 BTC to buy X ETH
+		q, r := fitQuantityByQuote(m.bestAsk.Price.Float64(), m.market.TruncateQuantity(m.bestAsk.Volume).Float64(), transitingQuantity)
+		fq := fixedpoint.NewFromFloat(q)
+		return types.SubmitOrder{
+			Symbol:   m.Symbol,
+			Side:     types.SideTypeBuy,
+			Type:     types.OrderTypeLimit,
+			Quantity: fq,
+			Price:    m.bestAsk.Price,
+			Market:   m.market,
+		}, r
+	} else {
+		panic(fmt.Errorf("unexpected direction: %v, valid values are (1, -1)", dir))
+	}
+
+	return types.SubmitOrder{}, 0.0
+}

pkg/strategy/tri/path.go

@@ -0,0 +1,83 @@
+package tri
+
+import (
+	"fmt"
+
+	"github.com/c9s/bbgo/pkg/types"
+)
+
+type Path struct {
+	marketA, marketB, marketC *ArbMarket
+	dirA, dirB, dirC          int
+}
+
+func (p *Path) solveDirection() error {
+	// check if we should reverse the rate
+	// ETHUSDT -> ETHBTC
+	if p.marketA.QuoteCurrency == p.marketB.BaseCurrency || p.marketA.QuoteCurrency == p.marketB.QuoteCurrency {
+		p.dirA = 1
+	} else if p.marketA.BaseCurrency == p.marketB.BaseCurrency || p.marketA.BaseCurrency == p.marketB.QuoteCurrency {
+		p.dirA = -1
+	} else {
+		return fmt.Errorf("marketA and marketB is not related")
+	}
+
+	if p.marketB.QuoteCurrency == p.marketC.BaseCurrency || p.marketB.QuoteCurrency == p.marketC.QuoteCurrency {
+		p.dirB = 1
+	} else if p.marketB.BaseCurrency == p.marketC.BaseCurrency || p.marketB.BaseCurrency == p.marketC.QuoteCurrency {
+		p.dirB = -1
+	} else {
+		return fmt.Errorf("marketB and marketC is not related")
+	}
+
+	if p.marketC.QuoteCurrency == p.marketA.BaseCurrency || p.marketC.QuoteCurrency == p.marketA.QuoteCurrency {
+		p.dirC = 1
+	} else if p.marketC.BaseCurrency == p.marketA.BaseCurrency || p.marketC.BaseCurrency == p.marketA.QuoteCurrency {
+		p.dirC = -1
+	} else {
+		return fmt.Errorf("marketC and marketA is not related")
+	}
+
+	return nil
+}
+
+func (p *Path) Ready() bool {
+	return !(p.marketA.bestAsk.Price.IsZero() || p.marketA.bestBid.Price.IsZero() ||
+		p.marketB.bestAsk.Price.IsZero() || p.marketB.bestBid.Price.IsZero() ||
+		p.marketC.bestAsk.Price.IsZero() || p.marketC.bestBid.Price.IsZero())
+}
+
+func (p *Path) String() string {
+	return p.marketA.String() + " " + p.marketB.String() + " " + p.marketC.String()
+}
+
+func (p *Path) newOrders(balances types.BalanceMap, sign int) [3]types.SubmitOrder {
+	var orders [3]types.SubmitOrder
+	var transitingQuantity float64
+
+	initialBalance, _ := p.marketA.getInitialBalance(balances, p.dirA*sign)
+	orderA, _ := p.marketA.newOrder(p.dirA*sign, initialBalance.Float64())
+	orders[0] = orderA
+
+	q, _ := orderA.Out()
+	transitingQuantity = q.Float64()
+
+	// orderB
+	orderB, rateB := p.marketB.newOrder(p.dirB*sign, transitingQuantity)
+	orders = adjustOrderQuantityByRate(orders, rateB)
+
+	q, _ = orderB.Out()
+	transitingQuantity = q.Float64()
+	orders[1] = orderB
+
+	orderC, rateC := p.marketC.newOrder(p.dirC*sign, transitingQuantity)
+	orders = adjustOrderQuantityByRate(orders, rateC)
+
+	q, _ = orderC.Out()
+	orders[2] = orderC
+
+	orders[0].Quantity = p.marketA.market.TruncateQuantity(orders[0].Quantity)
+	orders[1].Quantity = p.marketB.market.TruncateQuantity(orders[1].Quantity)
+	orders[2].Quantity = p.marketC.market.TruncateQuantity(orders[2].Quantity)
+	return orders
+}

pkg/strategy/tri/position.go

@@ -0,0 +1,139 @@
+package tri
+
+import (
+	"fmt"
+
+	"github.com/c9s/bbgo/pkg/fixedpoint"
+	"github.com/c9s/bbgo/pkg/types"
+)
+
+type MultiCurrencyPosition struct {
+	Currencies   map[string]fixedpoint.Value `json:"currencies"`
+	Markets      map[string]types.Market     `json:"markets"`
+	TotalProfits map[string]fixedpoint.Value `json:"totalProfits"`
+	Fees         map[string]fixedpoint.Value `json:"fees"`
+	TradePrices  map[string]fixedpoint.Value `json:"prices"`
+}
+
+func NewMultiCurrencyPosition(markets map[string]types.Market) *MultiCurrencyPosition {
+	p := &MultiCurrencyPosition{
+		Currencies:   make(map[string]fixedpoint.Value),
+		Markets:      make(map[string]types.Market),
+		TotalProfits: make(map[string]fixedpoint.Value),
+		TradePrices:  make(map[string]fixedpoint.Value),
+		Fees:         make(map[string]fixedpoint.Value),
+	}
+
+	for _, market := range markets {
+		p.Markets[market.Symbol] = market
+		p.Currencies[market.BaseCurrency] = fixedpoint.Zero
+		p.Currencies[market.QuoteCurrency] = fixedpoint.Zero
+		p.TotalProfits[market.QuoteCurrency] = fixedpoint.Zero
+		p.TotalProfits[market.BaseCurrency] = fixedpoint.Zero
+		p.Fees[market.QuoteCurrency] = fixedpoint.Zero
+		p.Fees[market.BaseCurrency] = fixedpoint.Zero
+		p.TradePrices[market.QuoteCurrency] = fixedpoint.Zero
+		p.TradePrices[market.BaseCurrency] = fixedpoint.Zero
+	}
+
+	return p
+}
+
+func (p *MultiCurrencyPosition) handleTrade(trade types.Trade) {
+	market := p.Markets[trade.Symbol]
+	switch trade.Side {
+	case types.SideTypeBuy:
+		p.Currencies[market.BaseCurrency] = p.Currencies[market.BaseCurrency].Add(trade.Quantity)
+		p.Currencies[market.QuoteCurrency] = p.Currencies[market.QuoteCurrency].Sub(trade.QuoteQuantity)
+
+	case types.SideTypeSell:
+		p.Currencies[market.BaseCurrency] = p.Currencies[market.BaseCurrency].Sub(trade.Quantity)
+		p.Currencies[market.QuoteCurrency] = p.Currencies[market.QuoteCurrency].Add(trade.QuoteQuantity)
+	}
+
+	if types.IsUSDFiatCurrency(market.QuoteCurrency) {
+		p.TradePrices[market.BaseCurrency] = trade.Price
+	} else if types.IsUSDFiatCurrency(market.BaseCurrency) { // For USDT/TWD pair, convert USDT/TWD price to TWD/USDT
+		p.TradePrices[market.QuoteCurrency] = one.Div(trade.Price)
+	}
+
+	if !trade.Fee.IsZero() {
+		if f, ok := p.Fees[trade.FeeCurrency]; ok {
+			p.Fees[trade.FeeCurrency] = f.Add(trade.Fee)
+		} else {
+			p.Fees[trade.FeeCurrency] = trade.Fee
+		}
+	}
+}
+
+func (p *MultiCurrencyPosition) CollectProfits() []Profit {
+	var profits []Profit
+	for currency, base := range p.Currencies {
+		if base.IsZero() {
+			continue
+		}
+
+		profit := Profit{
+			Asset:       currency,
+			Profit:      base,
+			ProfitInUSD: fixedpoint.Zero,
+		}
+
+		if price, ok := p.TradePrices[currency]; ok && !price.IsZero() {
+			profit.ProfitInUSD = base.Mul(price)
+		} else if types.IsUSDFiatCurrency(currency) {
+			profit.ProfitInUSD = base
+		}
+
+		profits = append(profits, profit)
+
+		if total, ok := p.TotalProfits[currency]; ok {
+			p.TotalProfits[currency] = total.Add(base)
+		} else {
+			p.TotalProfits[currency] = base
+		}
+	}
+
+	p.Reset()
+	return profits
+}
+
+func (p *MultiCurrencyPosition) Reset() {
+	for currency := range p.Currencies {
+		p.Currencies[currency] = fixedpoint.Zero
+	}
+}
+
+func (p *MultiCurrencyPosition) String() (o string) {
+	o += "position: \n"
+
+	for currency, base := range p.Currencies {
+		if base.IsZero() {
+			continue
+		}
+
+		o += fmt.Sprintf("- %s: %f\n", currency, base.Float64())
+	}
+
+	o += "totalProfits: \n"
+
+	for currency, total := range p.TotalProfits {
+		if total.IsZero() {
+			continue
+		}
+
+		o += fmt.Sprintf("- %s: %f\n", currency, total.Float64())
+	}
+
+	o += "fees: \n"
+
+	for currency, fee := range p.Fees {
+		if fee.IsZero() {
+			continue
+		}
+
+		o += fmt.Sprintf("- %s: %f\n", currency, fee.Float64())
+	}
+
+	return o
+}

pkg/strategy/tri/profit.go

@@ -0,0 +1,62 @@
+package tri
+
+import (
+	"fmt"
+
+	"github.com/slack-go/slack"
+
+	"github.com/c9s/bbgo/pkg/fixedpoint"
+	"github.com/c9s/bbgo/pkg/style"
+)
+
+type Profit struct {
+	Asset       string           `json:"asset"`
+	Profit      fixedpoint.Value `json:"profit"`
+	ProfitInUSD fixedpoint.Value `json:"profitInUSD"`
+}
+
+func (p *Profit) PlainText() string {
+	var title = fmt.Sprintf("Arbitrage Profit ")
+	title += style.PnLEmojiSimple(p.Profit) + " "
+	title += style.PnLSignString(p.Profit) + " " + p.Asset
+
+	if !p.ProfitInUSD.IsZero() {
+		title += " ~= " + style.PnLSignString(p.ProfitInUSD) + " USD"
+	}
+	return title
+}
+
+func (p *Profit) SlackAttachment() slack.Attachment {
+	var color = style.PnLColor(p.Profit)
+	var title = fmt.Sprintf("Triangular PnL ")
+	title += style.PnLEmojiSimple(p.Profit) + " "
+	title += style.PnLSignString(p.Profit) + " " + p.Asset
+
+	if !p.ProfitInUSD.IsZero() {
+		title += " ~= " + style.PnLSignString(p.ProfitInUSD) + " USD"
+	}
+
+	var fields []slack.AttachmentField
+	if !p.Profit.IsZero() {
+		fields = append(fields, slack.AttachmentField{
+			Title: "Profit",
+			Value: style.PnLSignString(p.Profit) + " " + p.Asset,
+			Short: true,
+		})
+	}
+
+	if !p.ProfitInUSD.IsZero() {
+		fields = append(fields, slack.AttachmentField{
+			Title: "Profit (~= USD)",
+			Value: style.PnLSignString(p.ProfitInUSD) + " USD",
+			Short: true,
+		})
+	}
+
+	return slack.Attachment{
+		Color:  color,
+		Title:  title,
+		Fields: fields,
+		// Footer:        "",
+	}
+}

pkg/strategy/tri/strategy.go

@@ -0,0 +1,880 @@
+package tri
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"math"
+	"sort"
+	"strconv"
+	"strings"
+	"sync"
+	"time"
+
+	"github.com/sirupsen/logrus"
+	"go.uber.org/multierr"
+
+	"github.com/c9s/bbgo/pkg/bbgo"
+	"github.com/c9s/bbgo/pkg/core"
+	"github.com/c9s/bbgo/pkg/fixedpoint"
+	"github.com/c9s/bbgo/pkg/sigchan"
+	"github.com/c9s/bbgo/pkg/style"
+	"github.com/c9s/bbgo/pkg/types"
+	"github.com/c9s/bbgo/pkg/util"
+)
+
+//go:generate bash symbols.sh
+
+const ID = "tri"
+
+var log = logrus.WithField("strategy", ID)
+
+var one = fixedpoint.One
+var marketOrderProtectiveRatio = fixedpoint.NewFromFloat(0.008)
+var balanceBufferRatio = fixedpoint.NewFromFloat(0.005)
+
+func init() {
+	bbgo.RegisterStrategy(ID, &Strategy{})
+}
+
+type Side int
+
+const Buy Side = 1
+const Sell Side = -1
+
+func (s Side) String() string {
+	return s.SideType().String()
+}
+
+func (s Side) SideType() types.SideType {
+	if s == 1 {
+		return types.SideTypeBuy
+	}
+
+	return types.SideTypeSell
+}
+
+type PathRank struct {
+	Path  *Path
+	Ratio float64
+}
+
+// backward buy -> buy -> sell
+func calculateBackwardRate(p *Path) float64 {
+	var ratio = 1.0
+	ratio *= p.marketA.calculateRatio(-p.dirA)
+	ratio *= p.marketB.calculateRatio(-p.dirB)
+	ratio *= p.marketC.calculateRatio(-p.dirC)
+	return ratio
+}
+
+// calculateForwardRatio
+// path: BTCUSDT (0.000044 / 22830.410000) => USDTTWD (0.033220 / 30.101000) => BTCTWD (0.000001 / 687500.000000) <= -> 0.9995899221105569 <- 1.0000373943873788
+// 1.0 * 22830 * 30.101000 / 687500.000
+
+// BTCUSDT (0.000044 / 22856.910000) => USDTTWD (0.033217 / 30.104000) => BTCTWD (0.000001 / 688002.100000)
+// sell -> rate * 22856
+// sell -> rate * 30.104
+// buy -> rate / 688002.1
+// 1.0000798312
+func calculateForwardRatio(p *Path) float64 {
+	var ratio = 1.0
+	ratio *= p.marketA.calculateRatio(p.dirA)
+	ratio *= p.marketB.calculateRatio(p.dirB)
+	ratio *= p.marketC.calculateRatio(p.dirC)
+	return ratio
+}
+
+func adjustOrderQuantityByRate(orders [3]types.SubmitOrder, rate float64) [3]types.SubmitOrder {
+	if rate == 1.0 || math.IsNaN(rate) {
+		return orders
+	}
+
+	for i, o := range orders {
+		orders[i].Quantity = o.Quantity.Mul(fixedpoint.NewFromFloat(rate))
+	}
+
+	return orders
+}
+
+type State struct {
+	IOCWinTimes     int     `json:"iocWinningTimes"`
+	IOCLossTimes    int     `json:"iocLossTimes"`
+	IOCWinningRatio float64 `json:"iocWinningRatio"`
+}
+
+type Strategy struct {
+	Symbols                    []string                    `json:"symbols"`
+	Paths                      [][]string                  `json:"paths"`
+	MinSpreadRatio             fixedpoint.Value            `json:"minSpreadRatio"`
+	SeparateStream             bool                        `json:"separateStream"`
+	Limits                     map[string]fixedpoint.Value `json:"limits"`
+	CoolingDownTime            types.Duration              `json:"coolingDownTime"`
+	NotifyTrade                bool                        `json:"notifyTrade"`
+	ResetPosition              bool                        `json:"resetPosition"`
+	MarketOrderProtectiveRatio fixedpoint.Value            `json:"marketOrderProtectiveRatio"`
+	IocOrderRatio              fixedpoint.Value            `json:"iocOrderRatio"`
+	DryRun                     bool                        `json:"dryRun"`
+
+	markets    map[string]types.Market
+	arbMarkets map[string]*ArbMarket
+	paths      []*Path
+
+	session *bbgo.ExchangeSession
+
+	activeOrders   *bbgo.ActiveOrderBook
+	orderStore     *core.OrderStore
+	tradeCollector *core.TradeCollector
+	Position       *MultiCurrencyPosition `persistence:"position"`
+	State          *State                 `persistence:"state"`
+	TradeState     *types.TradeStats      `persistence:"trade_stats"`
+	sigC           sigchan.Chan
+}
+
+func (s *Strategy) ID() string {
+	return ID
+}
+
+func (s *Strategy) InstanceID() string {
+	return ID + strings.Join(s.Symbols, "-")
+}
+
+func (s *Strategy) Subscribe(session *bbgo.ExchangeSession) {
+	if !s.SeparateStream {
+		for _, symbol := range s.Symbols {
+			session.Subscribe(types.BookChannel, symbol, types.SubscribeOptions{
+				Depth: types.DepthLevelFull,
+			})
+		}
+	}
+}
+
+func (s *Strategy) executeOrder(ctx context.Context, order types.SubmitOrder) *types.Order {
+	waitTime := 100 * time.Millisecond
+	for maxTries := 100; maxTries >= 0; maxTries-- {
+		createdOrder, err := s.session.Exchange.SubmitOrder(ctx, order)
+		if err != nil {
+			log.WithError(err).Errorf("can not submit orders")
+			time.Sleep(waitTime)
+			waitTime *= 2
+			continue
+		}
+
+		s.orderStore.Add(*createdOrder)
+		s.activeOrders.Add(*createdOrder)
+		return createdOrder
+	}
+
+	return nil
+}
+
+func (s *Strategy) Run(ctx context.Context, orderExecutor bbgo.OrderExecutor, session *bbgo.ExchangeSession) error {
+
+	if s.TradeState == nil {
+		s.TradeState = types.NewTradeStats("")
+	}
+
+	s.Symbols = compileSymbols(s.Symbols)
+
+	if s.MarketOrderProtectiveRatio.IsZero() {
+		s.MarketOrderProtectiveRatio = marketOrderProtectiveRatio
+	}
+
+	if s.MinSpreadRatio.IsZero() {
+		s.MinSpreadRatio = fixedpoint.NewFromFloat(1.002)
+	}
+
+	if s.State == nil {
+		s.State = &State{}
+	}
+
+	s.markets = make(map[string]types.Market)
+	s.sigC = sigchan.New(10)
+
+	s.session = session
+	s.orderStore = core.NewOrderStore("")
+	s.orderStore.AddOrderUpdate = true
+	s.orderStore.BindStream(session.UserDataStream)
+
+	s.activeOrders = bbgo.NewActiveOrderBook("")
+	s.activeOrders.BindStream(session.UserDataStream)
+	s.tradeCollector = core.NewTradeCollector("", nil, s.orderStore)
+
+	for _, symbol := range s.Symbols {
+		market, ok := session.Market(symbol)
+		if !ok {
+			return fmt.Errorf("market not found: %s", symbol)
+		}
+		s.markets[symbol] = market
+	}
+	s.optimizeMarketQuantityPrecision()
+
+	arbMarkets, err := s.buildArbMarkets(session, s.Symbols, s.SeparateStream, s.sigC)
+	if err != nil {
+		return err
+	}
+
+	s.arbMarkets = arbMarkets
+
+	if s.Position == nil {
+		s.Position = NewMultiCurrencyPosition(s.markets)
+	}
+
+	if s.ResetPosition {
+		s.Position = NewMultiCurrencyPosition(s.markets)
+	}
+
+	s.tradeCollector.OnTrade(func(trade types.Trade, profit fixedpoint.Value, netProfit fixedpoint.Value) {
+		s.Position.handleTrade(trade)
+	})
+
+	if s.NotifyTrade {
+		s.tradeCollector.OnTrade(func(trade types.Trade, profit fixedpoint.Value, netProfit fixedpoint.Value) {
+			bbgo.Notify(trade)
+		})
+	}
+
+	s.tradeCollector.BindStream(session.UserDataStream)
+
+	for _, market := range s.arbMarkets {
+		m := market
+		if s.SeparateStream {
+			log.Infof("connecting %s market stream...", m.Symbol)
+			if err := m.stream.Connect(ctx); err != nil {
+				return err
+			}
+		}
+	}
+
+	// build paths
+	// rate update and check paths
+	for _, pathSymbols := range s.Paths {
+		if len(pathSymbols) != 3 {
+			return errors.New("a path must contains 3 symbols")
+		}
+
+		p := &Path{
+			marketA: s.arbMarkets[pathSymbols[0]],
+			marketB: s.arbMarkets[pathSymbols[1]],
+			marketC: s.arbMarkets[pathSymbols[2]],
+		}
+
+		if p.marketA == nil {
+			return fmt.Errorf("market object of %s is missing", pathSymbols[0])
+		}
+
+		if p.marketB == nil {
+			return fmt.Errorf("market object of %s is missing", pathSymbols[1])
+		}
+
+		if p.marketC == nil {
+			return fmt.Errorf("market object of %s is missing", pathSymbols[2])
+		}
+
+		if err := p.solveDirection(); err != nil {
+			return err
+		}
+
+		s.paths = append(s.paths, p)
+	}
+
+	go func() {
+		fs := []ratioFunction{calculateForwardRatio, calculateBackwardRate}
+		log.Infof("waiting for market prices ready...")
+		wait := true
+		for wait {
+			wait = false
+			for _, p := range s.paths {
+				if !p.Ready() {
+					wait = true
+					break
+				}
+			}
+		}
+
+		log.Infof("all markets ready")
+
+		for {
+			select {
+			case <-ctx.Done():
+				return
+			case <-s.sigC:
+				minRatio := s.MinSpreadRatio.Float64()
+				for side, f := range fs {
+					ranks := s.calculateRanks(minRatio, f)
+					if len(ranks) == 0 {
+						break
+					}
+
+					forward := side == 0
+					bestRank := ranks[0]
+					if forward {
+						log.Infof("%d paths elected, found best forward path %s profit %.5f%%", len(ranks), bestRank.Path, (bestRank.Ratio-1.0)*100.0)
+					} else {
+						log.Infof("%d paths elected, found best backward path %s profit %.5f%%", len(ranks), bestRank.Path, (bestRank.Ratio-1.0)*100.0)
+					}
+					s.executePath(ctx, session, bestRank.Path, bestRank.Ratio, forward)
+				}
+			}
+		}
+	}()
+
+	return nil
+}
+
+type ratioFunction func(p *Path) float64
+
+func (s *Strategy) checkMinimalOrderQuantity(orders [3]types.SubmitOrder) error {
+	for _, order := range orders {
+		market := s.arbMarkets[order.Symbol]
+		if order.Quantity.Compare(market.market.MinQuantity) < 0 {
+			return fmt.Errorf("order quantity is too small: %f < %f", order.Quantity.Float64(), market.market.MinQuantity.Float64())
+		}
+
+		if order.Quantity.Mul(order.Price).Compare(market.market.MinNotional) < 0 {
+			return fmt.Errorf("order min notional is too small: %f < %f", order.Quantity.Mul(order.Price).Float64(), market.market.MinNotional.Float64())
+		}
+	}
+
+	return nil
+}
+
+func (s *Strategy) optimizeMarketQuantityPrecision() {
+	var baseMarkets = make(map[string][]types.Market)
+	for _, m := range s.markets {
+		baseMarkets[m.BaseCurrency] = append(baseMarkets[m.BaseCurrency], m)
+	}
+
+	for _, markets := range baseMarkets {
+		var prec = -1
+		for _, m := range markets {
+			if prec == -1 || m.VolumePrecision < prec {
+				prec = m.VolumePrecision
+			}
+		}
+
+		if prec == -1 {
+			continue
+		}
+
+		for _, m := range markets {
+			m.VolumePrecision = prec
+			s.markets[m.Symbol] = m
+		}
+	}
+}
+
+func (s *Strategy) applyBalanceMaxQuantity(balances types.BalanceMap) types.BalanceMap {
+	if s.Limits == nil {
+		return balances
+	}
+
+	for c, b := range balances {
+		if limit, ok := s.Limits[c]; ok {
+			b.Available = fixedpoint.Min(b.Available, limit)
+			balances[c] = b
+		}
+	}
+
+	return balances
+}
+
+func (s *Strategy) addBalanceBuffer(balances types.BalanceMap) (out types.BalanceMap) {
+	out = types.BalanceMap{}
+	for c, b := range balances {
+		ab := b
+		ab.Available = ab.Available.Mul(one.Sub(balanceBufferRatio))
+		out[c] = ab
+	}
+
+	return out
+}
+
+func (s *Strategy) toProtectiveMarketOrder(order types.SubmitOrder, ratio fixedpoint.Value) types.SubmitOrder {
+	sellRatio := one.Sub(ratio)
+	buyRatio := one.Add(ratio)
+
+	switch order.Side {
+	case types.SideTypeSell:
+		order.Price = order.Price.Mul(sellRatio)
+
+	case types.SideTypeBuy:
+		order.Price = order.Price.Mul(buyRatio)
+	}
+
+	return order
+}
+
+func (s *Strategy) toProtectiveMarketOrders(orders [3]types.SubmitOrder, ratio fixedpoint.Value) [3]types.SubmitOrder {
+	sellRatio := one.Sub(ratio)
+	buyRatio := one.Add(ratio)
+	for i, order := range orders {
+		switch order.Side {
+		case types.SideTypeSell:
+			order.Price = order.Price.Mul(sellRatio)
+
+		case types.SideTypeBuy:
+			order.Price = order.Price.Mul(buyRatio)
+		}
+
+		// order.Quantity = order.Market.TruncateQuantity(order.Quantity)
+		// order.Type = types.OrderTypeMarket
+		orders[i] = order
+	}
+
+	return orders
+}
+
+func (s *Strategy) executePath(ctx context.Context, session *bbgo.ExchangeSession, p *Path, ratio float64, dir bool) {
+	balances := session.Account.Balances()
+	balances = s.addBalanceBuffer(balances)
+	balances = s.applyBalanceMaxQuantity(balances)
+
+	var orders [3]types.SubmitOrder
+	if dir {
+		orders = p.newOrders(balances, 1)
+	} else {
+		orders = p.newOrders(balances, -1)
+	}
+
+	if err := s.checkMinimalOrderQuantity(orders); err != nil {
+		log.WithError(err).Warnf("order quantity too small, skip")
+		return
+	}
+
+	if s.DryRun {
+		logSubmitOrders(orders)
+		return
+	}
+
+	createdOrders, err := s.iocOrderExecution(ctx, session, orders, ratio)
+	if err != nil {
+		log.WithError(err).Errorf("order execute error")
+		return
+	}
+
+	if len(createdOrders) == 0 {
+		return
+	}
+
+	log.Info(s.Position.String())
+
+	profits := s.Position.CollectProfits()
+	profitInUSD := fixedpoint.Zero
+	for _, profit := range profits {
+		bbgo.Notify(&profit)
+		log.Info(profit.PlainText())
+
+		profitInUSD = profitInUSD.Add(profit.ProfitInUSD)
+
+		// FIXME:
+		// s.TradeState.Add(&profit)
+	}
+
+	notifyUsdPnL(profitInUSD)
+
+	log.Info(s.TradeState.BriefString())
+
+	bbgo.Sync(ctx, s)
+
+	if s.CoolingDownTime > 0 {
+		log.Infof("cooling down for %s", s.CoolingDownTime.Duration().String())
+		time.Sleep(s.CoolingDownTime.Duration())
+	}
+}
+
+func notifyUsdPnL(profit fixedpoint.Value) {
+	var title = fmt.Sprintf("Triangular Sum PnL ~= ")
+	title += style.PnLEmojiSimple(profit) + " "
+	title += style.PnLSignString(profit) + " USD"
+	bbgo.Notify(title)
+}
+
+func (s *Strategy) iocOrderExecution(ctx context.Context, session *bbgo.ExchangeSession, orders [3]types.SubmitOrder, ratio float64) (types.OrderSlice, error) {
+	service, ok := session.Exchange.(types.ExchangeOrderQueryService)
+	if !ok {
+		return nil, errors.New("exchange does not support ExchangeOrderQueryService")
+	}
+
+	var filledQuantity = fixedpoint.Zero
+
+	// Change the first order to IOC
+	orders[0].Type = types.OrderTypeLimit
+	orders[0].TimeInForce = types.TimeInForceIOC
+
+	var originalOrders [3]types.SubmitOrder
+	originalOrders[0] = orders[0]
+	originalOrders[1] = orders[1]
+	originalOrders[2] = orders[2]
+	logSubmitOrders(orders)
+
+	if !s.IocOrderRatio.IsZero() {
+		orders[0] = s.toProtectiveMarketOrder(orders[0], s.IocOrderRatio)
+	}
+
+	iocOrder := s.executeOrder(ctx, orders[0])
+	if iocOrder == nil {
+		return nil, errors.New("ioc order submit error")
+	}
+
+	iocOrderC := make(chan types.Order, 2)
+	defer func() {
+		close(iocOrderC)
+	}()
+
+	go func() {
+		o, err := s.waitWebSocketOrderDone(ctx, iocOrder.OrderID, 300*time.Millisecond)
+		if err != nil {
+			// log.WithError(err).Errorf("ioc order wait error")
+			return
+		} else if o != nil {
+			select {
+			case iocOrderC <- *o:
+			default:
+			}
+		}
+	}()
+
+	go func() {
+		o, err := waitForOrderFilled(ctx, service, *iocOrder, 3*time.Second)
+		if err != nil {
+			log.WithError(err).Errorf("ioc order restful wait error")
+			return
+		} else if o != nil {
+			select {
+			case iocOrderC <- *o:
+			default:
+			}
+		}
+	}()
+
+	o := <-iocOrderC
+
+	filledQuantity = o.ExecutedQuantity
+
+	if filledQuantity.IsZero() {
+		s.State.IOCLossTimes++
+
+		// we didn't get filled
+		log.Infof("%s %s IOC order did not get filled, skip: %+v", o.Symbol, o.Side, o)
+		return nil, nil
+	}
+
+	filledRatio := filledQuantity.Div(iocOrder.Quantity)
+	bbgo.Notify("%s %s IOC order got filled %f/%f (%s)", iocOrder.Symbol, iocOrder.Side, filledQuantity.Float64(), iocOrder.Quantity.Float64(), filledRatio.Percentage())
+	log.Infof("%s %s IOC order got filled %f/%f", iocOrder.Symbol, iocOrder.Side, filledQuantity.Float64(), iocOrder.Quantity.Float64())
+
+	orders[1].Quantity = orders[1].Quantity.Mul(filledRatio)
+	orders[2].Quantity = orders[2].Quantity.Mul(filledRatio)
+
+	if orders[1].Quantity.Compare(orders[1].Market.MinQuantity) <= 0 {
+		log.Warnf("order #2 quantity %f is less than min quantity %f, skip", orders[1].Quantity.Float64(), orders[1].Market.MinQuantity.Float64())
+		return nil, nil
+	}
+
+	if orders[2].Quantity.Compare(orders[2].Market.MinQuantity) <= 0 {
+		log.Warnf("order #3 quantity %f is less than min quantity %f, skip", orders[2].Quantity.Float64(), orders[2].Market.MinQuantity.Float64())
+		return nil, nil
+	}
+
+	orders[1] = s.toProtectiveMarketOrder(orders[1], s.MarketOrderProtectiveRatio)
+	orders[2] = s.toProtectiveMarketOrder(orders[2], s.MarketOrderProtectiveRatio)
+
+	var orderC = make(chan types.Order, 2)
+	var wg sync.WaitGroup
+	wg.Add(2)
+
+	go func() {
+		o := s.executeOrder(ctx, orders[1])
+		orderC <- *o
+		wg.Done()
+	}()
+
+	go func() {
+		o := s.executeOrder(ctx, orders[2])
+		orderC <- *o
+		wg.Done()
+	}()
+
+	wg.Wait()
+
+	var createdOrders = make(types.OrderSlice, 3)
+	createdOrders[0] = *iocOrder
+	createdOrders[1] = <-orderC
+	createdOrders[2] = <-orderC
+	close(orderC)
+
+	orderTrades, updatedOrders, err := s.waitOrdersAndCollectTrades(ctx, service, createdOrders)
+	if err != nil {
+		log.WithError(err).Errorf("trade collecting error")
+	} else {
+		for i, order := range updatedOrders {
+			trades, hasTrades := orderTrades[order.OrderID]
+			if !hasTrades {
+				continue
+			}
+			averagePrice := tradeAveragePrice(trades, order.OrderID)
+			updatedOrders[i].AveragePrice = averagePrice
+
+			if market, hasMarket := s.markets[order.Symbol]; hasMarket {
+				updatedOrders[i].Market = market
+			}
+
+			for _, originalOrder := range originalOrders {
+				if originalOrder.Symbol == updatedOrders[i].Symbol {
+					updatedOrders[i].Price = originalOrder.Price
+				}
+			}
+		}
+		s.analyzeOrders(updatedOrders)
+	}
+
+	// update ioc winning ratio
+	s.State.IOCWinTimes++
+	if s.State.IOCLossTimes == 0 {
+		s.State.IOCWinningRatio = 999.0
+	} else {
+		s.State.IOCWinningRatio = float64(s.State.IOCWinTimes) / float64(s.State.IOCLossTimes)
+	}
+
+	log.Infof("ioc winning ratio update: %f", s.State.IOCWinningRatio)
+
+	return createdOrders, nil
+}
+
+func (s *Strategy) waitWebSocketOrderDone(ctx context.Context, orderID uint64, timeoutDuration time.Duration) (*types.Order, error) {
+	prof := util.StartTimeProfile("waitWebSocketOrderDone")
+	defer prof.StopAndLog(log.Infof)
+
+	if order, ok := s.orderStore.Get(orderID); ok {
+		if order.Status == types.OrderStatusFilled || order.Status == types.OrderStatusCanceled {
+			return &order, nil
+		}
+	}
+
+	timeoutC := time.After(timeoutDuration)
+	for {
+		select {
+
+		case <-ctx.Done():
+			return nil, ctx.Err()
+
+		case <-timeoutC:
+			return nil, fmt.Errorf("order wait time timeout %s", timeoutDuration)
+
+		case order := <-s.orderStore.C:
+			if orderID == order.OrderID && (order.Status == types.OrderStatusFilled || order.Status == types.OrderStatusCanceled) {
+				return &order, nil
+			}
+		}
+	}
+}
+
+func (s *Strategy) waitOrdersAndCollectTrades(ctx context.Context, service types.ExchangeOrderQueryService, createdOrders types.OrderSlice) (map[uint64][]types.Trade, types.OrderSlice, error) {
+	var err error
+	var orderTrades = make(map[uint64][]types.Trade)
+	var updatedOrders types.OrderSlice
+	for _, o := range createdOrders {
+		updatedOrder, err2 := waitForOrderFilled(ctx, service, o, time.Second)
+		if err2 != nil {
+			err = multierr.Append(err, err2)
+			continue
+		}
+
+		trades, err3 := service.QueryOrderTrades(ctx, types.OrderQuery{
+			Symbol:  o.Symbol,
+			OrderID: strconv.FormatUint(o.OrderID, 10),
+		})
+		if err3 != nil {
+			err = multierr.Append(err, err3)
+			continue
+		}
+
+		for _, t := range trades {
+			s.tradeCollector.ProcessTrade(t)
+		}
+
+		orderTrades[o.OrderID] = trades
+		updatedOrders = append(updatedOrders, *updatedOrder)
+	}
+
+	/*
+	 */
+	return orderTrades, updatedOrders, nil
+}
+
+func (s *Strategy) analyzeOrders(orders types.OrderSlice) {
+	sort.Slice(orders, func(i, j int) bool {
+		// o1 < o2 -- earlier first
+		return orders[i].CreationTime.Before(orders[i].CreationTime.Time())
+	})
+
+	log.Infof("ANALYZING ORDERS (Earlier First)")
+	for i, o := range orders {
+		in, inCurrency := o.In()
+		out, outCurrency := o.Out()
+		log.Infof("#%d %s IN %f %s -> OUT %f %s", i, o.String(), in.Float64(), inCurrency, out.Float64(), outCurrency)
+	}
+
+	for _, o := range orders {
+		switch o.Side {
+		case types.SideTypeSell:
+			price := o.Price
+			priceDiff := o.AveragePrice.Sub(price)
+			slippage := priceDiff.Div(price)
+			log.Infof("%-8s %-4s %-10s AVG PRICE %f PRICE %f Q %f SLIPPAGE %.3f%%", o.Symbol, o.Side, o.Type, o.AveragePrice.Float64(), price.Float64(), o.Quantity.Float64(), slippage.Float64()*100.0)
+
+		case types.SideTypeBuy:
+			price := o.Price
+			priceDiff := price.Sub(o.AveragePrice)
+			slippage := priceDiff.Div(price)
+			log.Infof("%-8s %-4s %-10s AVG PRICE %f PRICE %f Q %f SLIPPAGE %.3f%%", o.Symbol, o.Side, o.Type, o.AveragePrice.Float64(), price.Float64(), o.Quantity.Float64(), slippage.Float64()*100.0)
+		}
+	}
+}
+
+func (s *Strategy) buildArbMarkets(session *bbgo.ExchangeSession, symbols []string, separateStream bool, sigC sigchan.Chan) (map[string]*ArbMarket, error) {
+	markets := make(map[string]*ArbMarket)
+	// build market object
+	for _, symbol := range symbols {
+		market, ok := s.markets[symbol]
+		if !ok {
+			return nil, fmt.Errorf("market not found: %s", symbol)
+		}
+
+		m := &ArbMarket{
+			Symbol:        symbol,
+			market:        market,
+			BaseCurrency:  market.BaseCurrency,
+			QuoteCurrency: market.QuoteCurrency,
+			sigC:          sigC,
+		}
+
+		if separateStream {
+			stream := session.Exchange.NewStream()
+			stream.SetPublicOnly()
+			stream.Subscribe(types.BookChannel, symbol, types.SubscribeOptions{
+				Depth: types.DepthLevelFull,
+				Speed: types.SpeedHigh,
+			})
+
+			book := types.NewStreamBook(symbol)
+			priceUpdater := func(_ types.SliceOrderBook) {
+				bestAsk, bestBid, _ := book.BestBidAndAsk()
+				if bestAsk.Equals(m.bestAsk) && bestBid.Equals(m.bestBid) {
+					return
+				}
+
+				m.bestBid = bestBid
+				m.bestAsk = bestAsk
+				m.updateRate()
+			}
+			book.OnUpdate(priceUpdater)
+			book.OnSnapshot(priceUpdater)
+			book.BindStream(stream)
+
+			stream.OnDisconnect(func() {
+				// reset price and volume
+				m.bestBid = types.PriceVolume{}
+				m.bestAsk = types.PriceVolume{}
+			})
+
+			m.book = book
+			m.stream = stream
+		} else {
+			book, _ := session.OrderBook(symbol)
+			priceUpdater := func(_ types.SliceOrderBook) {
+				bestAsk, bestBid, _ := book.BestBidAndAsk()
+				if bestAsk.Equals(m.bestAsk) && bestBid.Equals(m.bestBid) {
+					return
+				}
+
+				m.bestBid = bestBid
+				m.bestAsk = bestAsk
+				m.updateRate()
+			}
+			book.OnUpdate(priceUpdater)
+			book.OnSnapshot(priceUpdater)
+
+			m.book = book
+			m.stream = session.MarketDataStream
+		}
+
+		markets[symbol] = m
+	}
+
+	return markets, nil
+}
+
+func (s *Strategy) calculateRanks(minRatio float64, method func(p *Path) float64) []PathRank {
+	ranks := make([]PathRank, 0, len(s.paths))
+
+	// ranking paths here
+	for _, path := range s.paths {
+		ratio := method(path)
+		if ratio < minRatio {
+			continue
+		}
+
+		p := path
+		ranks = append(ranks, PathRank{Path: p, Ratio: ratio})
+	}
+
+	// sort and pick up the top rank path
+	sort.Slice(ranks, func(i, j int) bool {
+		return ranks[i].Ratio > ranks[j].Ratio
+	})
+
+	return ranks
+}
+
+func waitForOrderFilled(ctx context.Context, ex types.ExchangeOrderQueryService, order types.Order, timeout time.Duration) (*types.Order, error) {
+	prof := util.StartTimeProfile("waitForOrderFilled")
+	defer prof.StopAndLog(log.Infof)
+
+	timeoutC := time.After(timeout)
+
+	for {
+		select {
+		case <-timeoutC:
+			return nil, fmt.Errorf("order wait timeout %s", timeout)
+
+		default:
+			p := util.StartTimeProfile("queryOrder")
+			remoteOrder, err2 := ex.QueryOrder(ctx, types.OrderQuery{
+				Symbol:  order.Symbol,
+				OrderID: strconv.FormatUint(order.OrderID, 10),
+			})
+			p.StopAndLog(log.Infof)
+
+			if err2 != nil {
+				log.WithError(err2).Errorf("order query error")
+				time.Sleep(100 * time.Millisecond)
+				continue
+			}
+
+			switch remoteOrder.Status {
+			case types.OrderStatusFilled, types.OrderStatusCanceled:
+				return remoteOrder, nil
+			default:
+				log.Infof("WAITING: %s", remoteOrder.String())
+				time.Sleep(5 * time.Millisecond)
+			}
+		}
+	}
+}
+
+func tradeAveragePrice(trades []types.Trade, orderID uint64) fixedpoint.Value {
+	totalAmount := fixedpoint.Zero
+	totalQuantity := fixedpoint.Zero
+	for _, trade := range trades {
+		if trade.OrderID != orderID {
+			continue
+		}
+
+		totalAmount = totalAmount.Add(trade.Price.Mul(trade.Quantity))
+		totalQuantity = totalQuantity.Add(trade.Quantity)
+	}
+
+	return totalAmount.Div(totalQuantity)
+}

pkg/strategy/tri/strategy_test.go

@@ -0,0 +1,222 @@
+//go:build !dnum
+
+package tri
+
+import (
+	"context"
+	"fmt"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+
+	"github.com/c9s/bbgo/pkg/cache"
+	"github.com/c9s/bbgo/pkg/exchange/binance"
+	"github.com/c9s/bbgo/pkg/fixedpoint"
+	"github.com/c9s/bbgo/pkg/types"
+)
+
+var markets = make(types.MarketMap)
+
+func init() {
+	var err error
+	markets, err = cache.LoadExchangeMarketsWithCache(context.Background(), &binance.Exchange{})
+	if err != nil {
+		panic(err)
+	}
+}
+
+func loadMarket(symbol string) types.Market {
+	if market, ok := markets[symbol]; ok {
+		return market
+	}
+
+	panic(fmt.Errorf("market %s not found", symbol))
+}
+
+func newArbMarket(symbol, base, quote string, askPrice, askVolume, bidPrice, bidVolume float64) *ArbMarket {
+	return &ArbMarket{
+		Symbol:        symbol,
+		BaseCurrency:  base,
+		QuoteCurrency: quote,
+		market:        loadMarket(symbol),
+		book:          nil,
+		bestBid: types.PriceVolume{
+			Price:  fixedpoint.NewFromFloat(bidPrice),
+			Volume: fixedpoint.NewFromFloat(bidVolume),
+		},
+		bestAsk: types.PriceVolume{
+			Price:  fixedpoint.NewFromFloat(askPrice),
+			Volume: fixedpoint.NewFromFloat(askVolume),
+		},
+		buyRate:  1.0 / askPrice,
+		sellRate: bidPrice,
+	}
+}
+
+func TestPath_calculateBackwardRatio(t *testing.T) {
+	// BTCUSDT 22800.0 22700.0
+	// ETHBTC  0.074, 0.073
+	// ETHUSDT 1630.0 1620.0
+
+	// sell BTCUSDT @ 22700 ( 0.1 BTC => 2270 USDT)
+	// buy ETHUSDT @ 1630 ( 2270 USDT => 1.3926380368 ETH)
+	// sell ETHBTC @ 0.073  (1.3926380368 ETH => 0.1016625767 BTC)
+	marketA := newArbMarket("BTCUSDT", "BTC", "USDT", 22800.0, 1.0, 22700.0, 1.0)
+	marketB := newArbMarket("ETHBTC", "ETH", "BTC", 0.074, 2.0, 0.073, 2.0)
+	marketC := newArbMarket("ETHUSDT", "ETH", "USDT", 1630.0, 2.0, 1620.0, 2.0)
+	path := &Path{
+		marketA: marketA,
+		marketB: marketB,
+		marketC: marketC,
+		dirA:    -1,
+		dirB:    -1,
+		dirC:    1,
+	}
+	ratio := calculateForwardRatio(path)
+	assert.Equal(t, 0.9601706970128022, ratio)
+
+	ratio = calculateBackwardRate(path)
+	assert.Equal(t, 1.0166257668711656, ratio)
+}
+
+func TestPath_CalculateForwardRatio(t *testing.T) {
+	// BTCUSDT 22800.0 22700.0
+	// ETHBTC  0.070, 0.069
+	// ETHUSDT 1630.0 1620.0
+
+	// buy BTCUSDT @ 22800 ( 2280 usdt => 0.1 BTC)
+	// buy ETHBTC @ 0.070  ( 0.1 BTC => 1.4285714286 ETH)
+	// sell ETHUSDT @ 1620 ( 1.4285714286 ETH => 2,314.285714332 USDT)
+	marketA := newArbMarket("BTCUSDT", "BTC", "USDT", 22800.0, 1.0, 22700.0, 1.0)
+	marketB := newArbMarket("ETHBTC", "ETH", "BTC", 0.070, 2.0, 0.069, 2.0)
+	marketC := newArbMarket("ETHUSDT", "ETH", "USDT", 1630.0, 2.0, 1620.0, 2.0)
+	path := &Path{
+		marketA: marketA,
+		marketB: marketB,
+		marketC: marketC,
+		dirA:    -1,
+		dirB:    -1,
+		dirC:    1,
+	}
+	ratio := calculateForwardRatio(path)
+	assert.Equal(t, 1.015037593984962, ratio)
+
+	ratio = calculateBackwardRate(path)
+	assert.Equal(t, 0.9609202453987732, ratio)
+}
+
+func TestPath_newForwardOrders(t *testing.T) {
+	// BTCUSDT 22800.0 22700.0
+	// ETHBTC  0.070, 0.069
+	// ETHUSDT 1630.0 1620.0
+
+	// buy BTCUSDT @ 22800 ( 2280 usdt => 0.1 BTC)
+	// buy ETHBTC @ 0.070  ( 0.1 BTC => 1.4285714286 ETH)
+	// sell ETHUSDT @ 1620 ( 1.4285714286 ETH => 2,314.285714332 USDT)
+	marketA := newArbMarket("BTCUSDT", "BTC", "USDT", 22800.0, 1.0, 22700.0, 1.0)
+	marketB := newArbMarket("ETHBTC", "ETH", "BTC", 0.070, 2.0, 0.069, 2.0)
+	marketC := newArbMarket("ETHUSDT", "ETH", "USDT", 1630.0, 2.0, 1620.0, 2.0)
+	path := &Path{
+		marketA: marketA,
+		marketB: marketB,
+		marketC: marketC,
+		dirA:    -1,
+		dirB:    -1,
+		dirC:    1,
+	}
+	orders := path.newOrders(types.BalanceMap{
+		"USDT": {
+			Currency:  "USDT",
+			Available: fixedpoint.NewFromFloat(2280.0),
+			Locked:    fixedpoint.Zero,
+			Borrowed:  fixedpoint.Zero,
+			Interest:  fixedpoint.Zero,
+			NetAsset:  fixedpoint.Zero,
+		},
+	}, 1)
+	for i, order := range orders {
+		t.Logf("order #%d: %+v", i, order.String())
+	}
+
+	assert.InDelta(t, 2314.17, orders[2].Price.Mul(orders[2].Quantity).Float64(), 0.01)
+}
+
+func TestPath_newForwardOrdersWithAdjustRate(t *testing.T) {
+	// BTCUSDT 22800.0 22700.0
+	// ETHBTC  0.070, 0.069
+	// ETHUSDT 1630.0 1620.0
+
+	// buy BTCUSDT @ 22800 (2280 usdt => 0.1 BTC)
+	// buy ETHBTC @ 0.070  (0.1 BTC => 1.4285714286 ETH)
+
+	// APPLY ADJUST RATE B: 0.7 = 1 ETH / 1.4285714286 ETH
+	// buy BTCUSDT @ 22800 ( 1596 usdt => 0.07 BTC)
+	// buy ETHBTC @ 0.070  (0.07 BTC => 1 ETH)
+	// sell ETHUSDT @ 1620.0 (1 ETH => 1620 USDT)
+
+	// APPLY ADJUST RATE C: 0.5 = 0.5 ETH / 1 ETH
+	// buy BTCUSDT @ 22800 ( 798 usdt => 0.0035 BTC)
+	// buy ETHBTC @ 0.070  (0.035 BTC => 0.5 ETH)
+	// sell ETHUSDT @ 1620.0 (0.5 ETH => 1620 USDT)
+
+	// sell ETHUSDT @ 1620 ( 1.4285714286 ETH => 2,314.285714332 USDT)
+	marketA := newArbMarket("BTCUSDT", "BTC", "USDT", 22800.0, 1.0, 22700.0, 1.0)
+	marketB := newArbMarket("ETHBTC", "ETH", "BTC", 0.070, 1.0, 0.069, 2.0)
+	marketC := newArbMarket("ETHUSDT", "ETH", "USDT", 1630.0, 0.5, 1620.0, 0.5)
+	path := &Path{
+		marketA: marketA,
+		marketB: marketB,
+		marketC: marketC,
+		dirA:    -1,
+		dirB:    -1,
+		dirC:    1,
+	}
+	orders := path.newOrders(types.BalanceMap{
+		"USDT": {
+			Currency:  "USDT",
+			Available: fixedpoint.NewFromFloat(2280.0),
+			Locked:    fixedpoint.Zero,
+			Borrowed:  fixedpoint.Zero,
+			Interest:  fixedpoint.Zero,
+			NetAsset:  fixedpoint.Zero,
+		},
+	}, 1)
+	for i, order := range orders {
+		t.Logf("order #%d: %+v", i, order.String())
+	}
+
+	assert.Equal(t, "0.03499", orders[0].Quantity.String())
+	assert.Equal(t, "0.5", orders[1].Quantity.String())
+	assert.Equal(t, "0.5", orders[2].Quantity.String())
+}
+
+func Test_fitQuantityByQuote(t *testing.T) {
+	type args struct {
+		price        float64
+		quantity     float64
+		quoteBalance float64
+	}
+	tests := []struct {
+		name string
+		args args
+		want float64
+	}{
+		{
+			name: "simple",
+			args: args{
+				price:        1630.0,
+				quantity:     2.0,
+				quoteBalance: 1000,
+			},
+			want: 0.6134969325153374,
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got, _ := fitQuantityByQuote(tt.args.price, tt.args.quantity, tt.args.quoteBalance)
+			if !assert.Equal(t, got, tt.want) {
+				t.Errorf("fitQuantityByQuote() got = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}

pkg/strategy/tri/symbols.sh

@@ -0,0 +1,33 @@
+#!/bin/bash
+echo '// Code generated by "bash symbols.sh"; DO NOT EDIT.' > symbols.go
+echo 'package tri' >> symbols.go
+
+max_symbols=$(curl -s https://max-api.maicoin.com/api/v2/markets | jq -r '.[].id | ascii_upcase')
+binance_symbols=$(curl -s https://api.binance.com/api/v3/exchangeInfo | jq -r '.symbols[].symbol | ascii_upcase')
+symbols=$(echo "$max_symbols$binance_symbols" | sort | uniq | grep -v -E '^[0-9]' | grep -v "DOWNUSDT" | grep -v "UPUSDT")
+echo "$symbols" | perl -l -n -e 'BEGIN { print "const (" } END { print ")" } print qq{\t$_ = "$_"}' >> symbols.go
+
+cat <<DOC >> symbols.go
+var symbols = []string{
+  $(echo -e "$symbols" | tr '\n' ',')
+}
+
+func toSymbol(s string) string {
+  for _, symbol := range symbols {
+    if s == symbol {
+      return symbol
+    }
+  }
+  return s
+}
+
+func compileSymbols(symbols []string) []string {
+	var ss = make([]string, len(symbols))
+	for i, s := range symbols {
+		ss[i] = toSymbol(s)
+	}
+
+	return ss
+}
+
+DOC

pkg/strategy/tri/utils.go

@@ -0,0 +1,28 @@
+package tri
+
+import (
+	"math"
+
+	"github.com/c9s/bbgo/pkg/types"
+)
+
+func fitQuantityByBase(quantity, balance float64) (float64, float64) {
+	q := math.Min(quantity, balance)
+	r := q / balance
+	return q, r
+}
+
+// 1620 x 2 , quote balance = 1000 => rate = 1000/(1620*2) = 0.3086419753, quantity = 0.61728395
+func fitQuantityByQuote(price, quantity, quoteBalance float64) (float64, float64) {
+	quote := quantity * price
+	minQuote := math.Min(quote, quoteBalance)
+	q := minQuote / price
+	r := minQuote / quoteBalance
+	return q, r
+}
+
+func logSubmitOrders(orders [3]types.SubmitOrder) {
+	for i, order := range orders {
+		log.Infof("SUBMIT ORDER #%d: %s", i, order.String())
+	}
+}

pkg/strategy/wall/strategy.go

@@ -67,7 +67,7 @@ type Strategy struct {
 	activeAdjustmentOrders *bbgo.ActiveOrderBook
 	activeWallOrders       *bbgo.ActiveOrderBook
 	orderStore             *core.OrderStore
-	tradeCollector         *bbgo.TradeCollector
+	tradeCollector         *core.TradeCollector
 
 	groupID uint32
 
@@ -277,7 +277,7 @@ func (s *Strategy) Run(ctx context.Context, orderExecutor bbgo.OrderExecutor, se
 	s.orderStore = core.NewOrderStore(s.Symbol)
 	s.orderStore.BindStream(session.UserDataStream)
 
-	s.tradeCollector = bbgo.NewTradeCollector(s.Symbol, s.Position, s.orderStore)
+	s.tradeCollector = core.NewTradeCollector(s.Symbol, s.Position, s.orderStore)
 
 	s.tradeCollector.OnTrade(func(trade types.Trade, profit, netProfit fixedpoint.Value) {
 		bbgo.Notify(trade)

pkg/strategy/xmaker/strategy.go

@@ -105,7 +105,7 @@ type Strategy struct {
 	hedgeErrorRateReservation *rate.Reservation
 
 	orderStore     *core.OrderStore
-	tradeCollector *bbgo.TradeCollector
+	tradeCollector *core.TradeCollector
 
 	askPriceHeartBeat, bidPriceHeartBeat types.PriceHeartBeat
 
@@ -737,7 +737,7 @@ func (s *Strategy) CrossRun(ctx context.Context, orderExecutionRouter bbgo.Order
 	s.orderStore.BindStream(s.sourceSession.UserDataStream)
 	s.orderStore.BindStream(s.makerSession.UserDataStream)
 
-	s.tradeCollector = bbgo.NewTradeCollector(s.Symbol, s.Position, s.orderStore)
+	s.tradeCollector = core.NewTradeCollector(s.Symbol, s.Position, s.orderStore)
 
 	if s.NotifyTrade {
 		s.tradeCollector.OnTrade(func(trade types.Trade, profit, netProfit fixedpoint.Value) {

pkg/types/market.go

@@ -66,6 +66,7 @@ func (m Market) TruncateQuantity(quantity fixedpoint.Value) fixedpoint.Value {
 
 	qf := math.Trunc(quantity.Float64() * pow10)
 	qf = qf / pow10
+
 	qs := strconv.FormatFloat(qf, 'f', prec, 64)
 	return fixedpoint.MustNewFromString(qs)
 }

pkg/types/price_volume_slice.go

@@ -12,6 +12,10 @@ type PriceVolume struct {
 	Price, Volume fixedpoint.Value
 }
 
+func (p PriceVolume) Equals(b PriceVolume) bool {
+	return p.Price.Eq(b.Price) && p.Volume.Eq(b.Volume)
+}
+
 func (p PriceVolume) String() string {
 	return fmt.Sprintf("PriceVolume{ price: %s, volume: %s }", p.Price.String(), p.Volume.String())
 }
@@ -139,8 +143,7 @@ func (slice *PriceVolumeSlice) UnmarshalJSON(b []byte) error {
 
 // ParsePriceVolumeSliceJSON tries to parse a 2 dimensional string array into a PriceVolumeSlice
 //
-//  [["9000", "10"], ["9900", "10"], ... ]
+//	[["9000", "10"], ["9900", "10"], ... ]
-//
 func ParsePriceVolumeSliceJSON(b []byte) (slice PriceVolumeSlice, err error) {
 	var as [][]fixedpoint.Value