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38 lines
1.1 KiB
Python
38 lines
1.1 KiB
Python
"""数据库连通性应用服务。"""
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from __future__ import annotations
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from collections.abc import Callable
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from typing import Optional
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DatabaseProbe = Callable[[], Optional[str]]
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class DatabaseHealthService:
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"""为模块和诊断入口提供不暴露会话实现的数据库探测能力。"""
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def __init__(self, probe: DatabaseProbe) -> None:
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"""保存由组合根提供的数据库探测端口。"""
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self._probe = probe
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def test(self) -> Optional[str]:
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"""执行数据库探测，成功返回空值，失败返回说明。"""
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return self._probe()
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_configured_database_health: DatabaseHealthService | None = None
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def configure_database_health(service: DatabaseHealthService) -> None:
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"""由启动组合根登记数据库探测服务。"""
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global _configured_database_health
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_configured_database_health = service
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def get_configured_database_health() -> DatabaseHealthService:
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"""返回启动阶段登记的数据库探测服务。"""
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if _configured_database_health is None:
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raise RuntimeError("数据库探测服务尚未配置")
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return _configured_database_health
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