dekun
172 lines
5.6 KiB
Python
172 lines
5.6 KiB
Python
# Copyright (c) 2025-2026 马建军. All rights reserved.
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# 专有软件 — 未经授权禁止复制、传播、转售。
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# 严禁用于：带单/代客理财、向他人推荐期货品种或买卖建议、融资配资等业务。
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# 详见 LICENSE.zh-CN.txt 与 docs/软件购买与使用协议.md
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"""期货计仓：固定手数 / 固定金额。"""
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from __future__ import annotations
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import math
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from typing import Optional
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from contract_specs import get_contract_spec
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MODE_FIXED = "fixed"
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MODE_AMOUNT = "amount"
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MODE_RISK = "amount" # 兼容旧配置「以损定仓」
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DEFAULT_MAX_ORDER_LOTS = 50
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def normalize_sizing_mode(raw: str) -> str:
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m = (raw or MODE_FIXED).strip().lower()
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if m == "risk":
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m = MODE_AMOUNT
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return m if m in (MODE_FIXED, MODE_AMOUNT) else MODE_FIXED
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def price_precision_from_tick(tick_size: float) -> int:
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if tick_size <= 0:
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return 0
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s = f"{tick_size:.10f}".rstrip("0").rstrip(".")
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if "." not in s:
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return 0
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return len(s.split(".")[1])
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def _per_lot_risk(entry: float, stop_loss: float, direction: str, ths_code: str) -> tuple[float, Optional[str]]:
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spec = get_contract_spec(ths_code)
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mult = spec["mult"]
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d = (direction or "long").strip().lower()
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if d == "short":
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per_lot = (stop_loss - entry) * mult
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else:
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per_lot = (entry - stop_loss) * mult
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if per_lot <= 0:
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return 0.0, "止损方向与入场价不匹配"
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return per_lot, None
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def calc_lots_by_amount(
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entry: float,
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stop_loss: float,
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direction: str,
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amount: float,
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ths_code: str,
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*,
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capital: float = 0.0,
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max_lots: Optional[int] = None,
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max_margin_pct: float = 30.0,
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) -> tuple[Optional[int], Optional[str]]:
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"""固定金额：按止损距离将金额换算为手数。"""
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try:
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entry_f = float(entry)
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sl_f = float(stop_loss)
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budget = float(amount)
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cap = float(capital or 0)
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except (TypeError, ValueError):
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return None, "参数格式错误"
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if entry_f <= 0 or budget <= 0:
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return None, "入场价或固定金额无效"
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per_lot_risk, err = _per_lot_risk(entry_f, sl_f, direction, ths_code)
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if err:
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return None, err
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lots = int(math.floor(budget / per_lot_risk))
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if lots < 1:
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return None, f"按固定金额 {budget:.0f} 元，当前止损距离下不足 1 手"
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if cap > 0:
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spec = get_contract_spec(ths_code)
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margin_per_lot = entry_f * spec["mult"] * spec["margin_rate"]
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margin_cap = max(1.0, min(100.0, float(max_margin_pct or 30.0)))
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max_by_margin = (
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int(math.floor(cap * margin_cap / 100.0 / margin_per_lot))
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if margin_per_lot > 0 else lots
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)
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if max_by_margin < 1:
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return None, f"按保证金上限 {margin_cap:g}%，当前不足 1 手"
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lots = min(lots, max_by_margin)
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cap_lots = max_lots if max_lots is not None else DEFAULT_MAX_ORDER_LOTS
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lots = min(lots, cap_lots)
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return lots, None
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def calc_lots_by_risk(
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entry: float,
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stop_loss: float,
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direction: str,
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capital: float,
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risk_percent: float,
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ths_code: str,
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*,
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max_lots: Optional[int] = None,
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max_margin_pct: float = 30.0,
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) -> tuple[Optional[int], Optional[str]]:
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"""策略等场景：按权益百分比风险预算换算手数。"""
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try:
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cap = float(capital)
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rp = float(risk_percent)
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except (TypeError, ValueError):
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return None, "参数格式错误"
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if cap <= 0 or rp <= 0:
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return None, "资金或风险比例无效"
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budget = cap * rp / 100.0
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return calc_lots_by_amount(
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entry, stop_loss, direction, budget, ths_code,
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capital=cap, max_lots=max_lots, max_margin_pct=max_margin_pct,
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)
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def calc_order_tick_metrics(ths_code: str, lots: float, price: Optional[float] = None) -> dict:
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"""下单区展示：最小变动价位、每跳盈亏、保证金等。"""
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spec = get_contract_spec(ths_code)
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mult = int(spec["mult"])
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tick = float(spec.get("tick_size") or 1.0)
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margin_rate = float(spec["margin_rate"])
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lots_i = max(1, int(lots or 1))
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tick_value_per_lot = round(tick * mult, 4)
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tick_value_total = round(tick_value_per_lot * lots_i, 2)
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prec = price_precision_from_tick(tick)
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mark = float(price) if price else 0.0
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margin_per_lot = round(mark * mult * margin_rate, 2) if mark > 0 else None
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margin_total = round(margin_per_lot * lots_i, 2) if margin_per_lot else None
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return {
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"mult": mult,
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"tick_size": tick,
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"price_precision": prec,
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"tick_value_per_lot": tick_value_per_lot,
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"tick_value_total": tick_value_total,
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"lots": lots_i,
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"margin_per_lot": margin_per_lot,
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"margin_total": margin_total,
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"margin_rate": margin_rate,
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}
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def calc_margin_usage_pct(
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positions: list[dict],
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capital: float,
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*,
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extra_symbol: str = "",
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extra_lots: int = 0,
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extra_price: float = 0,
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) -> float:
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"""当前持仓 + 拟开仓占权益的保证金比例（%）。"""
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cap = float(capital or 0)
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if cap <= 0:
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return 999.0
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total = 0.0
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for p in positions:
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lots = int(p.get("lots") or 0)
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if lots <= 0:
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continue
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sym = (p.get("symbol") or "").strip()
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entry = float(p.get("avg_price") or p.get("entry_price") or 0)
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if entry <= 0:
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continue
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spec = get_contract_spec(sym)
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total += entry * spec["mult"] * lots * spec["margin_rate"]
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if extra_symbol and extra_lots > 0 and extra_price > 0:
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spec = get_contract_spec(extra_symbol)
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total += extra_price * spec["mult"] * extra_lots * spec["margin_rate"]
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return round(total / cap * 100.0, 2)
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