matitos
c500fb7572
- Add an SVG Bitcoin favicon and link it in index.html. - New indicators: macd() and roc(). - Five new strategies: macd_trend, bollinger_reversion, donchian_breakout, ema_cross, momentum (plus the existing sma_cross, rsi_reversion). - Default TIMEFRAME is now 5m (config, .env.example, compose, workflow, UI).
64 lines
2.1 KiB
Python
64 lines
2.1 KiB
Python
from __future__ import annotations
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from typing import ClassVar
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from app.engine.strategies.base import Strategy, StrategyContext, register
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from app.models import PositionSide
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@register
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class BollingerReversion(Strategy):
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"""Buy the lower Bollinger band, exit at the middle band."""
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key: ClassVar[str] = "bollinger_reversion"
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name: ClassVar[str] = "Bollinger Reversion"
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description: ClassVar[str] = (
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"Enter long when the close falls below the lower Bollinger band and exit "
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"when it returns to the middle band (SMA). Optional ATR stop."
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)
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default_params: ClassVar[dict] = {
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"period": 20,
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"num_std": 2.0,
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"atr_period": 14,
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"atr_stop_mult": 0.0,
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"size": 1.0,
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}
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param_help: ClassVar[dict] = {
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"period": "Bollinger lookback",
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"num_std": "Band width in standard deviations",
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"atr_period": "ATR lookback for the stop",
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"atr_stop_mult": "Stop distance in ATRs (0 disables)",
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"size": "Fraction of equity per trade",
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}
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param_bounds: ClassVar[dict] = {
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"period": (5, 100),
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"num_std": (0.5, 4.0),
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"atr_stop_mult": (0.0, 10.0),
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"size": (0.01, 1.0),
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}
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def on_candle(self, ctx: StrategyContext) -> None:
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period = int(self.params["period"])
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if len(ctx.closes) < period:
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return
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middle = ctx.sma(period)
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deviation = ctx.std(period)
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if middle is None or deviation is None:
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return
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lower = middle - float(self.params["num_std"]) * deviation
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if ctx.is_flat and ctx.price < lower:
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stop = None
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mult = float(self.params["atr_stop_mult"])
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if mult > 0:
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atr_value = ctx.atr(int(self.params["atr_period"]))
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if atr_value:
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stop = ctx.price - mult * atr_value
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ctx.enter_long(
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size=float(self.params["size"]),
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stop_loss=stop,
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reason="close below lower band",
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)
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elif ctx.side == PositionSide.LONG and ctx.price >= middle:
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ctx.close(reason="close back at middle band")
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