208 lines
7.9 KiB
Python
208 lines
7.9 KiB
Python
"""自定义信号 — 用户用「字段 + 运算符 + 值」组合出的布尔信号。
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职责:
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- 从 data/user_data/custom_signals/*.json 加载信号定义
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- 把每个信号的 conditions 编译成一条 Polars 布尔表达式（AND 组合）
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- 供 pipeline 在 compute_signals / compute_enriched_today 末尾注入为列
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不知道: 引擎、AI、API、回测、监控。纯函数 + 模块级缓存。
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设计:
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- 信号列名加前缀 ``csg_`` 避免与内置 ``signal_`` 列冲突。
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- 回测/选股/监控都按列名找信号，因此注入列后零特殊处理即可三处生效。
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- 字段白名单 + 固定运算符集，杜绝任意表达式注入。
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- 第一版只支持 AND（多条件同时满足）。
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"""
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from __future__ import annotations
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import json
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import logging
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import re
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from pathlib import Path
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import polars as pl
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logger = logging.getLogger(__name__)
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# ── 常量 ────────────────────────────────────────────────
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PREFIX = "csg_" # 自定义信号列名前缀
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ID_RE = re.compile(r"^[a-z0-9_]{1,40}$")
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OPS = {">", ">=", "<", "<=", "==", "!="}
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# 字段白名单：只允许这些列出现在条件里（防注入）。均为数值型。
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# 与 ENRICHED_COLUMNS 的数值列保持一致，排除 symbol/date/name 等非数值列。
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ALLOWED_FIELDS: frozenset[str] = frozenset({
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# 行情
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"open", "high", "low", "close", "volume", "amount", "turnover_rate",
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"consecutive_limit_ups", "consecutive_limit_downs",
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# 基础
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"prev_close", "change_pct", "change_amount", "amplitude",
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# 均线 / 指数均线
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"ma5", "ma10", "ma20", "ma30", "ma60",
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"ema5", "ema10", "ema20", "ema30", "ema60",
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# MACD / BOLL / KDJ / ATR
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"macd_dif", "macd_dea", "macd_hist",
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"boll_upper", "boll_lower",
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"kdj_k", "kdj_d", "kdj_j",
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"atr_14",
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# 量价 / 极值 / 动量 / 波动率 / RSI
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"vol_ma5", "vol_ma10", "vol_ratio_5d",
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"high_60d", "low_60d",
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"momentum_5d", "momentum_10d", "momentum_20d", "momentum_30d", "momentum_60d",
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"annual_vol_20d",
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"rsi_6", "rsi_14", "rsi_24",
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})
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# 运算符 → Polars 表达式构造器（输入 col_expr, value）
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_OP_BUILDERS = {
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">": lambda c, v: c > v,
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">=": lambda c, v: c >= v,
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"<": lambda c, v: c < v,
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"<=": lambda c, v: c <= v,
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"==": lambda c, v: c == v,
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"!=": lambda c, v: c != v,
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}
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# ── 持久化（镜像 strategy/config.py 的写法）──────────────
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def _dir(data_dir: Path) -> Path:
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d = data_dir / "user_data" / "custom_signals"
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d.mkdir(parents=True, exist_ok=True)
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return d
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def _path(data_dir: Path, signal_id: str) -> Path:
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return _dir(data_dir) / f"{signal_id}.json"
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def load_all(data_dir: Path) -> list[dict]:
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"""读取全部自定义信号定义。损坏的文件被跳过。"""
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d = _dir(data_dir)
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out: list[dict] = []
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for f in sorted(d.glob("*.json")):
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try:
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out.append(json.loads(f.read_text(encoding="utf-8")))
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except Exception as e:
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logger.warning("custom signal load failed %s: %s", f.name, e)
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return out
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def save_one(data_dir: Path, sig: dict) -> None:
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p = _path(data_dir, sig["id"])
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p.parent.mkdir(parents=True, exist_ok=True)
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p.write_text(json.dumps(sig, ensure_ascii=False, indent=2), encoding="utf-8")
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def delete_one(data_dir: Path, signal_id: str) -> bool:
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p = _path(data_dir, signal_id)
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if p.exists():
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p.unlink()
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return True
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return False
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# ── 校验 ────────────────────────────────────────────────
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def _parse_right(right: str) -> tuple[str, object]:
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"""解析右值。返回 ('field', colname) 或 ('const', float)。"""
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if isinstance(right, (int, float)):
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return ("const", float(right))
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if not isinstance(right, str):
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raise ValueError(f"非法右值: {right!r}")
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if right.startswith("field:"):
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col = right[len("field:"):]
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if col not in ALLOWED_FIELDS:
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raise ValueError(f"右值字段不在白名单: {col}")
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return ("field", col)
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# 纯数字
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try:
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return ("const", float(right))
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except ValueError:
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raise ValueError(f"非法右值（应为 field:xxx 或数字）: {right!r}")
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def validate(sig: dict) -> None:
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"""校验一个信号定义，非法则抛 ValueError（含中文信息）。"""
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sid = sig.get("id", "")
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if not isinstance(sid, str) or not ID_RE.match(sid):
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raise ValueError(f"信号 id 非法（仅小写字母数字下划线，1-40字符）: {sid!r}")
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if not isinstance(sig.get("name"), str) or not sig["name"].strip():
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raise ValueError("信号 name 不能为空")
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if sig.get("kind") not in ("entry", "exit", "both"):
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raise ValueError("kind 必须是 entry / exit / both")
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conds = sig.get("conditions")
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if not isinstance(conds, list) or len(conds) == 0:
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raise ValueError("conditions 不能为空")
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if len(conds) > 8:
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raise ValueError("conditions 最多 8 条")
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for i, c in enumerate(conds):
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if not isinstance(c, dict):
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raise ValueError(f"第 {i+1} 个条件格式错误")
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left = c.get("left", "")
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if left not in ALLOWED_FIELDS:
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raise ValueError(f"第 {i+1} 个条件: 字段 {left!r} 不在白名单")
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if c.get("op") not in OPS:
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raise ValueError(f"第 {i+1} 个条件: 运算符 {c.get('op')!r} 非法")
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_parse_right(c.get("right")) # 会校验右值字段/数字
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# ── 编译为 Polars 表达式 ─────────────────────────────────
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def column_name(signal_id: str) -> str:
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"""信号 id → DataFrame 列名（加前缀）。"""
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return f"{PREFIX}{signal_id}"
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def build_expressions(signals: list[dict]) -> dict[str, pl.Expr]:
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"""把多个自定义信号编译成 {column_name: pl.Expr}。
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- 只处理 enabled != False 的信号。
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- 单个信号内多条件用 ``&`` 串联（AND）。
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- 编译失败的信号被跳过并告警（不影响其它信号）。
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"""
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out: dict[str, pl.Expr] = {}
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for sig in signals:
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if sig.get("enabled") is False:
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continue
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try:
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conds = sig["conditions"]
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col_name = column_name(sig["id"])
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parts: list[pl.Expr] = []
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for c in conds:
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left = c["left"]
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op = c["op"]
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kind, val = _parse_right(c["right"])
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right_expr = pl.col(val) if kind == "field" else val
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parts.append(_OP_BUILDERS[op](pl.col(left), right_expr))
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combined = parts[0]
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for p in parts[1:]:
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combined = combined & p
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out[col_name] = combined
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except Exception as e:
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logger.warning("custom signal compile failed %s: %s", sig.get("id"), e)
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return out
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def inject(df: pl.DataFrame, exprs: dict[str, pl.Expr]) -> pl.DataFrame:
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"""把编译好的信号表达式作为列加入 df。仅添加 df 已含其依赖列的信号。"""
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if df.is_empty() or not exprs:
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return df
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cols = set(df.columns)
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add: dict[str, pl.Expr] = {}
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for name, expr in exprs.items():
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# 提取该表达式引用的所有字段列，缺失则跳过（避免运行时报错）
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needed = _expr_root_columns(expr)
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if needed.issubset(cols):
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add[name] = expr
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if add:
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df = df.with_columns([e.alias(n) for n, e in add.items()])
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return df
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def _expr_root_columns(expr: pl.Expr) -> set[str]:
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"""尽力提取表达式里出现的列名。失败则返回空集（保守跳过）。"""
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try:
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# Polars 的 meta.root_names() 返回表达式引用的根列名
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names = expr.meta.root_names()
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return set(names)
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except Exception:
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return set()
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