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from collections import deque
from decimal import Decimal
import pandas as pd
from shared.models import Candle, Signal, OrderSide
from strategies.base import BaseStrategy
class EmaCrossoverStrategy(BaseStrategy):
name: str = "ema_crossover"
def __init__(self) -> None:
self._closes: deque[float] = deque(maxlen=500)
self._short_period: int = 9
self._long_period: int = 21
self._quantity: Decimal = Decimal("0.01")
self._prev_short_above: bool | None = None
@property
def warmup_period(self) -> int:
return self._long_period
def configure(self, params: dict) -> None:
self._short_period = int(params.get("short_period", 9))
self._long_period = int(params.get("long_period", 21))
self._quantity = Decimal(str(params.get("quantity", "0.01")))
if self._short_period >= self._long_period:
raise ValueError(
f"EMA short_period must be < long_period, "
f"got short={self._short_period}, long={self._long_period}"
)
if self._short_period < 2:
raise ValueError(f"EMA short_period must be >= 2, got {self._short_period}")
if self._long_period < 2:
raise ValueError(f"EMA long_period must be >= 2, got {self._long_period}")
if self._quantity <= 0:
raise ValueError(f"Quantity must be positive, got {self._quantity}")
def reset(self) -> None:
self._closes.clear()
self._prev_short_above = None
def on_candle(self, candle: Candle) -> Signal | None:
self._closes.append(float(candle.close))
if len(self._closes) < self._long_period:
return None
series = pd.Series(list(self._closes))
short_ema = series.ewm(span=self._short_period, adjust=False).mean().iloc[-1]
long_ema = series.ewm(span=self._long_period, adjust=False).mean().iloc[-1]
short_above = short_ema > long_ema
signal = None
if self._prev_short_above is not None:
if not self._prev_short_above and short_above:
signal = Signal(
strategy=self.name,
symbol=candle.symbol,
side=OrderSide.BUY,
price=candle.close,
quantity=self._quantity,
reason=f"Golden Cross: short EMA ({short_ema:.2f}) crossed above long EMA ({long_ema:.2f})",
)
elif self._prev_short_above and not short_above:
signal = Signal(
strategy=self.name,
symbol=candle.symbol,
side=OrderSide.SELL,
price=candle.close,
quantity=self._quantity,
reason=f"Death Cross: short EMA ({short_ema:.2f}) crossed below long EMA ({long_ema:.2f})",
)
self._prev_short_above = short_above
return signal
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