87 lines
3.6 KiB
Python
87 lines
3.6 KiB
Python
"""统一数据获取与缓存服务。"""
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from __future__ import annotations
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from typing import List, Optional
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from sidecar.config import SidecarConfig
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from sidecar.models import KlineBar, Snapshot
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from sidecar.sources.base import MarketDataSource
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from sidecar.symbols import normalize_symbol
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from sidecar.storage import DuckDBStore
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class UnifiedDataService:
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"""统一行情获取与缓存服务。"""
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def __init__(
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self,
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store: DuckDBStore,
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config: SidecarConfig,
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kline_source: MarketDataSource,
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snapshot_sources: List[MarketDataSource],
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) -> None:
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"""
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功能说明：创建统一数据服务。
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参数说明：store 为 DuckDB 仓储，config 为配置，kline_source 为 K 线源，snapshot_sources 为快照源列表。
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返回值说明：无返回值。
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注意事项：快照源按列表顺序尝试，前一个失败会自动降级到下一个。
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"""
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self.store = store
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self.config = config
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self.kline_source = kline_source
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self.snapshot_sources = snapshot_sources
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def get_kline(self, symbol: str, period: str = "day", limit: int = 800, refresh: bool = False) -> List[KlineBar]:
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"""
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功能说明：获取统一 K 线数据并自动缓存。
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参数说明：symbol 为股票代码，period 为周期，limit 为最大条数，refresh 表示是否强制刷新。
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返回值说明：返回按日期升序排列的 KlineBar 列表。
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注意事项：缓存数量达到 limit 且未强制刷新时直接返回本地数据。
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"""
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normalized = normalize_symbol(symbol)
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if not refresh:
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cached = self.store.load_kline(normalized, period, limit)
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if len(cached) >= limit:
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return cached
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bars = self.kline_source.fetch_kline(normalized, period, limit)
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self.store.save_kline(bars)
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return self.store.load_kline(normalized, period, limit)
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def get_snapshot(self, symbol: str, refresh: bool = False) -> Snapshot:
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"""
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功能说明：获取统一行情快照并自动缓存。
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参数说明：symbol 为股票代码，refresh 表示是否强制刷新。
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返回值说明：返回 Snapshot 快照。
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注意事项：默认使用未过期缓存；远端失败时会尝试下一个数据源。
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"""
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normalized = normalize_symbol(symbol)
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if not refresh:
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cached = self.store.load_snapshot(normalized)
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if cached is not None:
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return cached
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last_error = None
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for source in self.snapshot_sources:
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try:
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snapshot = source.fetch_snapshot(normalized)
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self.store.save_snapshot(snapshot, self.config.snapshot_ttl_seconds)
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return snapshot
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except Exception as exc:
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last_error = exc
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raise RuntimeError("所有快照数据源均失败: %s" % symbol) from last_error
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def create_default_service(config: SidecarConfig) -> UnifiedDataService:
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"""
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功能说明：创建默认 sidecar 服务实例。
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参数说明：config 为 sidecar 配置。
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返回值说明：返回 UnifiedDataService。
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注意事项：默认 K 线使用 mootdx，快照优先腾讯财经并回退到 mootdx。
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"""
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from sidecar.sources.mootdx_source import MootdxSource
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from sidecar.sources.tencent import TencentFinanceSource
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store = DuckDBStore(config.db_path)
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mootdx = MootdxSource()
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tencent = TencentFinanceSource(config.request_timeout_seconds)
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return UnifiedDataService(store, config, mootdx, [tencent, mootdx]) |