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Implemented TestPosition for TestBroker

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This commit is contained in:
Luke I. Wilson 2023-05-15 14:31:49 -05:00
parent 842870011a
commit 977296152c
3 changed files with 125 additions and 45 deletions
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111
backtesting.go
View File

@ -35,12 +35,11 @@ func Backtest(trader *Trader) {
// - PositionModified(Position) - Called when a position changes.
type TestBroker struct {
SignalManager
DataBroker Broker
Data *DataFrame
Cash float64
Leverage float64
Spread float64 // Number of pips to add to the price when buying and subtract when selling. (Forex)
StartCandles int
DataBroker Broker
Data *DataFrame
Cash float64
Leverage float64
Spread float64 // Number of pips to add to the price when buying and subtract when selling. (Forex)
candleCount int // The number of candles anyone outside this broker has seen. Also equal to the number of times Candles has been called.
orders []Order
@ -48,27 +47,26 @@ type TestBroker struct {
}
// CandleIndex returns the index of the current candle.
func (b *TestBroker) candleIndex() int {
func (b *TestBroker) CandleIndex() int {
return Max(b.candleCount-1, 0)
}
// Advance advances the test broker to the next candle in the input data. This should be done at the end of the
// strategy loop.
func (b *TestBroker) Advance() {
b.candleCount++
}
func (b *TestBroker) Candles(symbol string, frequency string, count int) (*DataFrame, error) {
// Check if we reached the end of the existing data.
if b.Data != nil && b.candleCount >= b.Data.Len() {
if b.Data != nil && b.candleCount > b.Data.Len() {
return b.Data.Copy(0, -1).(*DataFrame), ErrEOF
}
// Catch up to the start candles.
if b.candleCount < b.StartCandles {
b.candleCount = b.StartCandles
} else {
b.candleCount++
}
return b.candles(symbol, frequency, count)
data, err := b.candles(symbol, frequency, count)
return data, err
}
// candles does the same as the public Candles except it doesn't increment b.candleCount so that it can be used
// internally to fetch candles without incrementing the count.
func (b *TestBroker) candles(symbol string, frequency string, count int) (*DataFrame, error) {
if b.DataBroker != nil && b.Data == nil {
// Fetch a lot of candles from the broker so we don't keep asking.
@ -83,14 +81,7 @@ func (b *TestBroker) candles(symbol string, frequency string, count int) (*DataF
// TODO: check if count > our rows if we are using a data broker and then fetch more data if so.
// Catch up to the start candles.
if b.candleCount < b.StartCandles {
b.candleCount = b.StartCandles
}
// We use a Max(b.candleCount, 1) because we want to return at least 1 candle (even if b.candleCount is 0),
// which may happen if we call this function before the first call to Candles.
end := Max(b.candleCount, 1) - 1
end := b.candleCount - 1
start := Max(Max(b.candleCount, 1)-count, 0)
return b.Data.Copy(start, end).(*DataFrame), nil
@ -106,16 +97,12 @@ func (b *TestBroker) MarketOrder(symbol string, units float64, stopLoss, takePro
return nil, err
}
}
price := b.Data.Close(b.candleIndex()) // Get the last close price.
// Instantly fulfill the order.
b.Cash -= price * units * LeverageToMargin(b.Leverage)
position := &TestPosition{}
price := b.Data.Close(b.CandleIndex()) // Get the last close price.
order := &TestOrder{
id: strconv.Itoa(rand.Int()),
leverage: b.Leverage,
position: position,
position: nil,
price: price,
symbol: symbol,
stopLoss: stopLoss,
@ -125,15 +112,37 @@ func (b *TestBroker) MarketOrder(symbol string, units float64, stopLoss, takePro
units: units,
}
// Instantly fulfill the order.
order.position = &TestPosition{
broker: b,
closed: false,
entryPrice: price,
id: strconv.Itoa(rand.Int()),
leverage: b.Leverage,
symbol: symbol,
stopLoss: stopLoss,
takeProfit: takeProfit,
time: time.Now(),
units: units,
}
b.Cash -= order.position.EntryValue()
b.orders = append(b.orders, order)
b.positions = append(b.positions, position)
b.positions = append(b.positions, order.position)
b.SignalEmit("OrderPlaced", order)
return order, nil
}
func (b *TestBroker) NAV() float64 {
return b.Cash
nav := b.Cash
// Add the value of open positions to our NAV.
for _, position := range b.positions {
if !position.Closed() {
nav += position.Value()
}
}
return nav
}
func (b *TestBroker) Orders() []Order {
@ -146,12 +155,12 @@ func (b *TestBroker) Positions() []Position {
func NewTestBroker(dataBroker Broker, data *DataFrame, cash, leverage, spread float64, startCandles int) *TestBroker {
return &TestBroker{
DataBroker: dataBroker,
Data: data,
Cash: cash,
Leverage: Max(leverage, 1),
Spread: spread,
StartCandles: Max(startCandles-1, 0),
DataBroker: dataBroker,
Data: data,
Cash: cash,
Leverage: Max(leverage, 1),
Spread: spread,
candleCount: Max(startCandles, 1),
}
}
@ -159,6 +168,7 @@ type TestPosition struct {
broker *TestBroker
closed bool
entryPrice float64
closePrice float64 // If zero, then position has not been closed.
id string
leverage float64
symbol string
@ -173,6 +183,8 @@ func (p *TestPosition) Close() error {
return ErrPositionClosed
}
p.closed = true
p.closePrice = p.broker.Data.Close(p.broker.CandleIndex()) - p.broker.Spread // Get the last close price.
p.broker.Cash += p.Value() // Return the value of the position to the broker.
return nil
}
@ -184,6 +196,14 @@ func (p *TestPosition) EntryPrice() float64 {
return p.entryPrice
}
func (p *TestPosition) ClosePrice() float64 {
return p.closePrice
}
func (p *TestPosition) EntryValue() float64 {
return p.entryPrice * p.units
}
func (p *TestPosition) Id() string {
return p.id
}
@ -193,10 +213,7 @@ func (p *TestPosition) Leverage() float64 {
}
func (p *TestPosition) PL() float64 {
price := p.broker.Data.Close(p.broker.candleIndex()) + p.broker.Spread
priceDiff := price - p.entryPrice
units := priceDiff * p.units * LeverageToMargin(p.leverage)
return units * price
return p.Value() - p.EntryValue()
}
func (p *TestPosition) Symbol() string {
@ -219,6 +236,14 @@ func (p *TestPosition) Units() float64 {
return p.units
}
func (p *TestPosition) Value() float64 {
if p.closed {
return p.closePrice * p.units
}
bid := p.broker.Data.Close(p.broker.CandleIndex()) - p.broker.Spread
return bid * p.units
}
type TestOrder struct {
id string
leverage float64

56
backtesting_test.go
View File

@ -1,6 +1,7 @@
package autotrader
import (
"math"
"strings"
"testing"
"time"
@ -49,6 +50,7 @@ func TestBacktestingBrokerCandles(t *testing.T) {
t.Errorf("Expected first candle to be 2022-01-01, got %s", candles.Date(0))
}
broker.Advance()
candles, err = broker.Candles("EUR_USD", "D", 3)
if err != nil {
t.Fatal(err)
@ -60,10 +62,11 @@ func TestBacktestingBrokerCandles(t *testing.T) {
t.Errorf("Expected second candle to be 2022-01-02, got %s", candles.Date(1))
}
for i := 0; i < 7; i++ { // 7 because we want to call broker.Candles 9 times total
for i := 0; i < 7; i++ { // 6 because we want to call broker.Candles 9 times total
broker.Advance()
candles, err = broker.Candles("EUR_USD", "D", 5)
if err != nil {
t.Fatalf("Got an error on iteration %d: %v", i, err)
t.Fatalf("Got an error on iteration %d: %v (called Candles %d times)", i, err, 2+i+1)
}
if candles == nil {
t.Errorf("Candles is nil on iteration %d", i+1)
@ -88,6 +91,7 @@ func TestBacktestingBrokerFunctions(t *testing.T) {
func TestBacktestingBrokerOrders(t *testing.T) {
data := newTestingDataframe()
broker := NewTestBroker(nil, data, 100_000, 50, 0, 0)
timeBeforeOrder := time.Now()
order, err := broker.MarketOrder("EUR_USD", 50_000, 0, 0) // Buy 50,000 USD for 1000 EUR with no stop loss or take profit
if err != nil {
@ -124,4 +128,52 @@ func TestBacktestingBrokerOrders(t *testing.T) {
if order.Type() != MarketOrder {
t.Errorf("Expected order type to be MarketOrder, got %s", order.Type())
}
position := order.Position()
if position == nil {
t.Fatal("Position is nil")
}
if position.Symbol() != "EUR_USD" {
t.Errorf("Expected symbol to be EUR_USD, got %s", position.Symbol())
}
if position.Units() != 50_000 {
t.Errorf("Expected units to be 50_000, got %f", position.Units())
}
if position.EntryPrice() != 1.15 {
t.Errorf("Expected entry price to be 1.15 (first close), got %f", position.EntryPrice())
}
if position.Time().Before(timeBeforeOrder) {
t.Error("Expected position time to be after timeBeforeOrder")
}
if position.Leverage() != 50 {
t.Errorf("Expected leverage to be 50, got %f", position.Leverage())
}
if position.StopLoss() != 0 {
t.Errorf("Expected stop loss to be 0, got %f", position.StopLoss())
}
if position.TakeProfit() != 0 {
t.Errorf("Expected take profit to be 0, got %f", position.TakeProfit())
}
if broker.NAV() != 100_000 { // NAV should not change until the next candle
t.Errorf("Expected NAV to be 100_000, got %f", broker.NAV())
}
broker.Advance() // Advance broker to the next candle
if math.Round(position.PL()) != 2500 { // (1.2-1.15) * 50_000 = 2500
t.Errorf("Expected position PL to be 2500, got %f", position.PL())
}
if math.Round(broker.NAV()) != 102_500 {
t.Errorf("Expected NAV to be 102_500, got %f", broker.NAV())
}
// Test closing positions.
position.Close()
if position.Closed() != true {
t.Error("Expected position to be closed")
}
broker.Advance()
if broker.NAV() != 102_500 {
t.Errorf("Expected NAV to still be 102_500, got %f", broker.NAV())
}
}

3
broker.go
View File

@ -38,7 +38,9 @@ type Order interface {
type Position interface {
Close() error // Close attempts to close the position and returns an error if it fails. If the error is nil, the position was closed.
Closed() bool // Closed returns true if the position has been closed with the broker.
ClosePrice() float64 // ClosePrice returns the price of the symbol at the time the position was closed. May be zero if the position is still open.
EntryPrice() float64 // EntryPrice returns the price of the symbol at the time the position was opened.
EntryValue() float64 // EntryValue returns the value of the position at the time it was opened.
Id() string // Id returns the unique identifier of the position by the broker.
Leverage() float64 // Leverage returns the leverage of the position.
PL() float64 // PL returns the profit or loss of the position.
@ -47,6 +49,7 @@ type Position interface {
TakeProfit() float64 // TakeProfit returns the take profit price of the position.
Time() time.Time // Time returns the time the position was opened.
Units() float64 // Units returns the number of units purchased or sold by the position.
Value() float64 // Value returns the value of the position at the current price.
}
type Broker interface {