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448 lines
10 KiB
Go
448 lines
10 KiB
Go
package backtest
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import (
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"fmt"
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"sync"
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"sync/atomic"
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"time"
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"github.com/pkg/errors"
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"github.com/c9s/bbgo/pkg/fixedpoint"
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"github.com/c9s/bbgo/pkg/types"
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)
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// DefaultFeeRate set the fee rate for most cases
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// BINANCE uses 0.1% for both maker and taker
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// for BNB holders, it's 0.075% for both maker and taker
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// MAX uses 0.050% for maker and 0.15% for taker
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var DefaultFeeRate = fixedpoint.NewFromFloat(0.075 * 0.01)
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var orderID uint64 = 1
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var tradeID uint64 = 1
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func incOrderID() uint64 {
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return atomic.AddUint64(&orderID, 1)
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}
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func incTradeID() uint64 {
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return atomic.AddUint64(&tradeID, 1)
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}
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// SimplePriceMatching implements a simple kline data driven matching engine for backtest
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//go:generate callbackgen -type SimplePriceMatching
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type SimplePriceMatching struct {
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Symbol string
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Market types.Market
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mu sync.Mutex
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bidOrders []types.Order
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askOrders []types.Order
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LastPrice fixedpoint.Value
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LastKLine types.KLine
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CurrentTime time.Time
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Account *types.Account
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MakerFeeRate fixedpoint.Value `json:"makerFeeRate"`
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TakerFeeRate fixedpoint.Value `json:"takerFeeRate"`
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tradeUpdateCallbacks []func(trade types.Trade)
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orderUpdateCallbacks []func(order types.Order)
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balanceUpdateCallbacks []func(balances types.BalanceMap)
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}
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func (m *SimplePriceMatching) CancelOrder(o types.Order) (types.Order, error) {
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found := false
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switch o.Side {
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case types.SideTypeBuy:
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m.mu.Lock()
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var orders []types.Order
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for _, order := range m.bidOrders {
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if o.OrderID == order.OrderID {
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found = true
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continue
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}
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orders = append(orders, order)
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}
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m.bidOrders = orders
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m.mu.Unlock()
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case types.SideTypeSell:
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m.mu.Lock()
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var orders []types.Order
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for _, order := range m.askOrders {
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if o.OrderID == order.OrderID {
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found = true
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continue
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}
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orders = append(orders, order)
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}
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m.askOrders = orders
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m.mu.Unlock()
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}
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if !found {
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return o, fmt.Errorf("cancel order failed, order %d not found: %+v", o.OrderID, o)
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}
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switch o.Side {
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case types.SideTypeBuy:
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if err := m.Account.UnlockBalance(m.Market.QuoteCurrency, o.Price.Mul(o.Quantity)); err != nil {
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return o, err
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}
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case types.SideTypeSell:
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if err := m.Account.UnlockBalance(m.Market.BaseCurrency, o.Quantity); err != nil {
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return o, err
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}
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}
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o.Status = types.OrderStatusCanceled
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m.EmitOrderUpdate(o)
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m.EmitBalanceUpdate(m.Account.Balances())
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return o, nil
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}
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func (m *SimplePriceMatching) PlaceOrder(o types.SubmitOrder) (closedOrders *types.Order, trades *types.Trade, err error) {
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// price for checking account balance, default price
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price := o.Price
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switch o.Type {
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case types.OrderTypeMarket:
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if m.LastPrice.IsZero() {
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panic("unexpected: last price can not be zero")
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}
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price = m.LastPrice
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case types.OrderTypeLimit, types.OrderTypeLimitMaker:
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price = o.Price
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}
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if o.Quantity.Compare(m.Market.MinQuantity) < 0 {
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return nil, nil, fmt.Errorf("order quantity %s is less than minQuantity %s, order: %+v", o.Quantity.String(), m.Market.MinQuantity.String(), o)
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}
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quoteQuantity := o.Quantity.Mul(price)
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if quoteQuantity.Compare(m.Market.MinNotional) < 0 {
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return nil, nil, fmt.Errorf("order amount %s is less than minNotional %s, order: %+v", quoteQuantity.String(), m.Market.MinNotional.String(), o)
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}
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switch o.Side {
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case types.SideTypeBuy:
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if err := m.Account.LockBalance(m.Market.QuoteCurrency, quoteQuantity); err != nil {
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return nil, nil, err
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}
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case types.SideTypeSell:
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if err := m.Account.LockBalance(m.Market.BaseCurrency, o.Quantity); err != nil {
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return nil, nil, err
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}
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}
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m.EmitBalanceUpdate(m.Account.Balances())
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// start from one
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orderID := incOrderID()
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order := m.newOrder(o, orderID)
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if o.Type == types.OrderTypeMarket {
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m.EmitOrderUpdate(order)
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// emit trade before we publish order
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trade := m.newTradeFromOrder(order, false)
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m.executeTrade(trade)
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// update the order status
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order.Status = types.OrderStatusFilled
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order.ExecutedQuantity = order.Quantity
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order.Price = price
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order.IsWorking = false
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m.EmitOrderUpdate(order)
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return &order, &trade, nil
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}
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// for limit maker orders
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// TODO: handle limit taker order
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switch o.Side {
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case types.SideTypeBuy:
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m.mu.Lock()
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m.bidOrders = append(m.bidOrders, order)
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m.mu.Unlock()
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case types.SideTypeSell:
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m.mu.Lock()
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m.askOrders = append(m.askOrders, order)
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m.mu.Unlock()
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}
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m.EmitOrderUpdate(order)
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return &order, nil, nil
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}
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func (m *SimplePriceMatching) executeTrade(trade types.Trade) {
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var err error
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// execute trade, update account balances
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if trade.IsBuyer {
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err = m.Account.UseLockedBalance(m.Market.QuoteCurrency, trade.Price.Mul(trade.Quantity))
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m.Account.AddBalance(m.Market.BaseCurrency, trade.Quantity)
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} else {
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err = m.Account.UseLockedBalance(m.Market.BaseCurrency, trade.Quantity)
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m.Account.AddBalance(m.Market.QuoteCurrency, trade.Quantity.Mul(trade.Price))
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}
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if err != nil {
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panic(errors.Wrapf(err, "executeTrade exception, wanted to use more than the locked balance"))
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}
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m.EmitTradeUpdate(trade)
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m.EmitBalanceUpdate(m.Account.Balances())
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return
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}
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func (m *SimplePriceMatching) newTradeFromOrder(order types.Order, isMaker bool) types.Trade {
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// BINANCE uses 0.1% for both maker and taker
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// MAX uses 0.050% for maker and 0.15% for taker
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var feeRate = DefaultFeeRate
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if isMaker {
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if m.MakerFeeRate.Sign() > 0 {
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feeRate = m.MakerFeeRate
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}
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} else {
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if m.TakerFeeRate.Sign() > 0 {
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feeRate = m.TakerFeeRate
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}
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}
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price := order.Price
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switch order.Type {
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case types.OrderTypeMarket, types.OrderTypeStopMarket:
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if m.LastPrice.IsZero() {
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panic("unexpected: last price can not be zero")
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}
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price = m.LastPrice
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}
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var fee fixedpoint.Value
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var feeCurrency string
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switch order.Side {
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case types.SideTypeBuy:
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fee = order.Quantity.Mul(feeRate)
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feeCurrency = m.Market.BaseCurrency
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case types.SideTypeSell:
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fee = order.Quantity.Mul(price).Mul(feeRate)
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feeCurrency = m.Market.QuoteCurrency
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}
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var id = incTradeID()
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return types.Trade{
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ID: id,
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OrderID: order.OrderID,
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Exchange: "backtest",
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Price: price,
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Quantity: order.Quantity,
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QuoteQuantity: order.Quantity.Mul(price),
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Symbol: order.Symbol,
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Side: order.Side,
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IsBuyer: order.Side == types.SideTypeBuy,
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IsMaker: isMaker,
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Time: types.Time(m.CurrentTime),
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Fee: fee,
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FeeCurrency: feeCurrency,
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}
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}
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func (m *SimplePriceMatching) BuyToPrice(price fixedpoint.Value) (closedOrders []types.Order, trades []types.Trade) {
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var askOrders []types.Order
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for _, o := range m.askOrders {
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switch o.Type {
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case types.OrderTypeStopMarket:
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// should we trigger the order
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if price.Compare(o.StopPrice) <= 0 {
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// not triggering it, put it back
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askOrders = append(askOrders, o)
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break
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}
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o.Type = types.OrderTypeMarket
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o.ExecutedQuantity = o.Quantity
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o.Price = price
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o.Status = types.OrderStatusFilled
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closedOrders = append(closedOrders, o)
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case types.OrderTypeStopLimit:
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// should we trigger the order?
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if price.Compare(o.StopPrice) <= 0 {
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askOrders = append(askOrders, o)
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break
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}
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o.Type = types.OrderTypeLimit
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// is it a taker order?
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if price.Compare(o.Price) >= 0 {
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o.ExecutedQuantity = o.Quantity
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o.Status = types.OrderStatusFilled
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closedOrders = append(closedOrders, o)
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} else {
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// maker order
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askOrders = append(askOrders, o)
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}
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case types.OrderTypeLimit, types.OrderTypeLimitMaker:
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if price.Compare(o.Price) >= 0 {
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o.ExecutedQuantity = o.Quantity
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o.Status = types.OrderStatusFilled
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closedOrders = append(closedOrders, o)
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} else {
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askOrders = append(askOrders, o)
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}
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default:
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askOrders = append(askOrders, o)
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}
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}
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m.askOrders = askOrders
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m.LastPrice = price
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for _, o := range closedOrders {
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trade := m.newTradeFromOrder(o, true)
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m.executeTrade(trade)
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trades = append(trades, trade)
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m.EmitOrderUpdate(o)
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}
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return closedOrders, trades
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}
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func (m *SimplePriceMatching) SellToPrice(price fixedpoint.Value) (closedOrders []types.Order, trades []types.Trade) {
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var sellPrice = price
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var bidOrders []types.Order
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for _, o := range m.bidOrders {
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switch o.Type {
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case types.OrderTypeStopMarket:
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// should we trigger the order
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if sellPrice.Compare(o.StopPrice) <= 0 {
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o.ExecutedQuantity = o.Quantity
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o.Price = sellPrice
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o.Status = types.OrderStatusFilled
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closedOrders = append(closedOrders, o)
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} else {
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bidOrders = append(bidOrders, o)
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}
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case types.OrderTypeStopLimit:
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// should we trigger the order
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if sellPrice.Compare(o.StopPrice) <= 0 {
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o.Type = types.OrderTypeLimit
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if sellPrice.Compare(o.Price) <= 0 {
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o.ExecutedQuantity = o.Quantity
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o.Status = types.OrderStatusFilled
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closedOrders = append(closedOrders, o)
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} else {
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bidOrders = append(bidOrders, o)
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}
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} else {
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bidOrders = append(bidOrders, o)
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}
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case types.OrderTypeLimit, types.OrderTypeLimitMaker:
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if sellPrice.Compare(o.Price) <= 0 {
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o.ExecutedQuantity = o.Quantity
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o.Status = types.OrderStatusFilled
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closedOrders = append(closedOrders, o)
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} else {
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bidOrders = append(bidOrders, o)
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}
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default:
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bidOrders = append(bidOrders, o)
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}
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}
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m.bidOrders = bidOrders
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m.LastPrice = price
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for _, o := range closedOrders {
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trade := m.newTradeFromOrder(o, true)
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m.executeTrade(trade)
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trades = append(trades, trade)
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m.EmitOrderUpdate(o)
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}
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return closedOrders, trades
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}
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func (m *SimplePriceMatching) processKLine(kline types.KLine) {
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m.CurrentTime = kline.EndTime.Time()
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m.LastKLine = kline
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switch kline.Direction() {
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case types.DirectionDown:
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if kline.High.Compare(kline.Open) >= 0 {
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m.BuyToPrice(kline.High)
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}
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if kline.Low.Compare(kline.Close) > 0 {
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m.SellToPrice(kline.Low)
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m.BuyToPrice(kline.Close)
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} else {
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m.SellToPrice(kline.Close)
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}
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case types.DirectionUp:
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if kline.Low.Compare(kline.Open) <= 0 {
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m.SellToPrice(kline.Low)
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}
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if kline.High.Compare(kline.Close) > 0 {
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m.BuyToPrice(kline.High)
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m.SellToPrice(kline.Close)
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} else {
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m.BuyToPrice(kline.Close)
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}
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default: // no trade up or down
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if m.LastPrice.IsZero() {
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m.BuyToPrice(kline.Close)
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}
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}
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}
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func (m *SimplePriceMatching) newOrder(o types.SubmitOrder, orderID uint64) types.Order {
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return types.Order{
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OrderID: orderID,
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SubmitOrder: o,
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Exchange: types.ExchangeBacktest,
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Status: types.OrderStatusNew,
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ExecutedQuantity: fixedpoint.Zero,
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IsWorking: true,
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CreationTime: types.Time(m.CurrentTime),
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UpdateTime: types.Time(m.CurrentTime),
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}
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}
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