root
58 lines
1.5 KiB
Python
58 lines
1.5 KiB
Python
"""Leverage cap server-side per place_order (IBKR Reg-T context).
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Cap letto dal secret JSON via campo `max_leverage`. Default 1 (cash) se assente.
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IBKR margin accounts default a 4x intraday / 2x overnight (Reg-T).
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"""
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from __future__ import annotations
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from fastapi import HTTPException
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def get_max_leverage(creds: dict) -> int:
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"""Legge max_leverage dal secret. Default 1 se mancante."""
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raw = creds.get("max_leverage", 1)
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try:
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value = int(raw)
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except (TypeError, ValueError):
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value = 1
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return max(1, value)
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def enforce_leverage(
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requested: int | float | None,
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*,
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creds: dict,
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exchange: str,
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) -> int:
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"""Verifica e applica leverage cap. Ritorna leverage applicabile.
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Solleva HTTPException(403, LEVERAGE_CAP_EXCEEDED) se requested > cap.
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Se requested is None, applica il cap come default.
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"""
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cap = get_max_leverage(creds)
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if requested is None:
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return cap
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lev = int(requested)
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if lev < 1:
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raise HTTPException(
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status_code=403,
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detail={
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"error": "LEVERAGE_CAP_EXCEEDED",
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"exchange": exchange,
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"requested": lev,
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"max": cap,
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"reason": "leverage must be >= 1",
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},
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)
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if lev > cap:
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raise HTTPException(
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status_code=403,
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detail={
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"error": "LEVERAGE_CAP_EXCEEDED",
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"exchange": exchange,
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"requested": lev,
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"max": cap,
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},
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)
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return lev
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