38 lines
1.5 KiB
Python
38 lines
1.5 KiB
Python
from __future__ import annotations
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from dataclasses import dataclass
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from backend.data.contracts import DataSource, DataUsage
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class DataPolicyError(RuntimeError):
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pass
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@dataclass(frozen=True, slots=True)
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class DataSourcePolicy:
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calculation_sources: frozenset[DataSource] = frozenset(
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{DataSource.TUSHARE, DataSource.IFIND, DataSource.LOCAL}
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)
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display_sources: frozenset[DataSource] = frozenset(DataSource)
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def assert_allowed(self, source: DataSource, usage: DataUsage) -> None:
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allowed = (
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self.calculation_sources if usage is DataUsage.CALCULATION else self.display_sources
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)
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if source not in allowed:
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raise DataPolicyError(f"{source.value} cannot be used for {usage.value}")
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def candidates(self, dataset: str, usage: DataUsage) -> tuple[DataSource, ...]:
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routes = {
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("calendar", DataUsage.CALCULATION): (DataSource.TUSHARE,),
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("entities", DataUsage.CALCULATION): (DataSource.TUSHARE,),
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("daily_chart", DataUsage.DISPLAY): (DataSource.IFIND, DataSource.TUSHARE),
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("minute_chart", DataUsage.DISPLAY): (DataSource.IFIND, DataSource.EASTMONEY),
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("realtime_quote", DataUsage.CALCULATION): (DataSource.IFIND, DataSource.TUSHARE),
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("market_insight", DataUsage.CALCULATION): (DataSource.TUSHARE,),
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("dynamic_auction", DataUsage.CALCULATION): (DataSource.IFIND,),
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("screener_factors", DataUsage.CALCULATION): (DataSource.TUSHARE,),
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}
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return routes.get((dataset, usage), ())
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