143 lines
4.7 KiB
Python
143 lines
4.7 KiB
Python
# ============================================================
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# 数据库引擎与会话（moduleId: db-database, 可重生 ✅）
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# SQLite 单文件：server/data/master.db（APS_DB_PATH 可覆盖）
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# ============================================================
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from __future__ import annotations
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import os
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import threading
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from sqlalchemy import create_engine
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from sqlalchemy.engine import Engine
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from sqlalchemy.orm import Session, sessionmaker
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_PATH_ENV = "APS_DB_PATH"
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_URL_ENV = "APS_DATABASE_URL"
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def _default_db_path() -> str:
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try:
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from server.aps_home import default_db_path
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return default_db_path()
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except Exception:
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return "server/data/master.db"
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_DEFAULT_PATH = "server/data/master.db"
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_lock = threading.Lock()
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_engine: Engine | None = None
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_engine_path: str | None = None
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_SessionLocal: sessionmaker | None = None
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def _db_path() -> str:
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return os.environ.get(_PATH_ENV) or _default_db_path()
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def _database_url() -> str:
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configured = (os.environ.get(_URL_ENV) or "").strip()
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if configured:
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return configured
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return f"sqlite:///{_db_path()}"
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def get_engine() -> Engine:
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"""懒加载引擎；APS_DB_PATH 变化时自动重建（测试隔离用）。"""
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global _engine, _engine_path, _SessionLocal
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url = _database_url()
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with _lock:
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if _engine is None or _engine_path != url:
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kwargs = {"pool_pre_ping": True}
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if url.startswith("sqlite:///"):
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path = url.removeprefix("sqlite:///")
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os.makedirs(os.path.dirname(path) or ".", exist_ok=True)
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kwargs["connect_args"] = {"check_same_thread": False}
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_engine = create_engine(url, **kwargs)
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_engine_path = url
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_SessionLocal = sessionmaker(bind=_engine, expire_on_commit=False)
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init_db(_engine)
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return _engine
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def reset_engine() -> None:
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"""丢弃当前引擎（测试切换 APS_DB_PATH 后调用）。"""
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global _engine, _engine_path, _SessionLocal
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with _lock:
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if _engine is not None:
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_engine.dispose()
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_engine = None
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_engine_path = None
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_SessionLocal = None
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def get_session() -> Session:
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get_engine()
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assert _SessionLocal is not None
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return _SessionLocal()
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def init_db(engine: Engine | None = None) -> None:
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"""建表（幂等）。"""
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from server.db.models import Base
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target = engine or get_engine()
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if target.dialect.name == "sqlite":
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_migrate_legacy_sqlite(target)
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Base.metadata.create_all(target)
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def _migrate_legacy_sqlite(engine: Engine) -> None:
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"""Small compatibility migration for databases created before tenant columns existed."""
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from sqlalchemy import inspect, text
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inspector = inspect(engine)
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additions = {
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"projects": {
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"tenant_uuid": "VARCHAR(32) NOT NULL DEFAULT 'platform'",
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"creator_id": "BIGINT",
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"updater_id": "BIGINT",
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"updated_at": "VARCHAR(32) NOT NULL DEFAULT ''",
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"deleted": "BIGINT NOT NULL DEFAULT 0",
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"owner_user_id": "BIGINT",
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"data_version": "INTEGER NOT NULL DEFAULT 0",
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},
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"master_records": {
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"tenant_uuid": "VARCHAR(32) NOT NULL DEFAULT 'platform'",
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"creator_id": "BIGINT",
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"updater_id": "BIGINT",
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"updated_at": "VARCHAR(32) NOT NULL DEFAULT ''",
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"deleted": "BIGINT NOT NULL DEFAULT 0",
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},
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"project_settings": {
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"tenant_uuid": "VARCHAR(32) NOT NULL DEFAULT 'platform'",
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"creator_id": "BIGINT",
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"updater_id": "BIGINT",
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"updated_at": "VARCHAR(32) NOT NULL DEFAULT ''",
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"deleted": "BIGINT NOT NULL DEFAULT 0",
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},
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"routing_templates": {
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"tenant_uuid": "VARCHAR(32) NOT NULL DEFAULT 'platform'",
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"creator_id": "BIGINT",
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"updater_id": "BIGINT",
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"updated_at": "VARCHAR(32) NOT NULL DEFAULT ''",
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"deleted": "BIGINT NOT NULL DEFAULT 0",
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},
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"routing_template_steps": {
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"tenant_uuid": "VARCHAR(32) NOT NULL DEFAULT 'platform'",
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"creator_id": "BIGINT",
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"updater_id": "BIGINT",
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"updated_at": "VARCHAR(32) NOT NULL DEFAULT ''",
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"deleted": "BIGINT NOT NULL DEFAULT 0",
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},
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}
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tables = set(inspector.get_table_names())
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with engine.begin() as connection:
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for table, columns in additions.items():
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if table not in tables:
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continue
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existing = {col["name"] for col in inspector.get_columns(table)}
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for name, ddl in columns.items():
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if name not in existing:
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connection.execute(text(f"ALTER TABLE {table} ADD COLUMN {name} {ddl}"))
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