91 lines
2.1 KiB
Python
91 lines
2.1 KiB
Python
from collections.abc import Generator
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import logging
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import time
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from sqlalchemy import create_engine, event, text
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from sqlalchemy.orm import Session, sessionmaker
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try:
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# For module mode: `uvicorn app.main:app`
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from app.settings import settings
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except ModuleNotFoundError:
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# For script mode: `python app/main.py` or VS Code "Run Python File"
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from settings import settings
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engine = create_engine(
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settings.mysql_dsn,
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pool_size=5,
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max_overflow=10,
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pool_pre_ping=True,
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pool_recycle=1800,
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future=True,
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)
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logger = logging.getLogger("app.db")
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@event.listens_for(engine, "before_cursor_execute")
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def before_cursor_execute(
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conn,
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cursor,
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statement,
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parameters,
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context,
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executemany,
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):
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conn.info.setdefault("query_start_time", []).append(time.perf_counter())
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@event.listens_for(engine, "after_cursor_execute")
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def after_cursor_execute(
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conn,
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cursor,
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statement,
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parameters,
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context,
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executemany,
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):
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start_time = None
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query_start_time = conn.info.get("query_start_time")
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if query_start_time:
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start_time = query_start_time.pop(-1)
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if start_time is None:
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return
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elapsed_ms = (time.perf_counter() - start_time) * 1000
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if elapsed_ms >= settings.slow_sql_ms:
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logger.warning(
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"slow sql detected",
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extra={
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"event": "slow_sql",
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"sql_ms": round(elapsed_ms, 2),
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"statement": " ".join(statement.split())[:280],
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},
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)
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SessionLocal = sessionmaker(
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bind=engine,
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autocommit=False,
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autoflush=False,
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expire_on_commit=False,
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)
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def get_db() -> Generator[Session, None, None]:
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db = SessionLocal()
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try:
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yield db
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finally:
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db.close()
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def check_db_connection() -> None:
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with engine.connect() as conn:
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conn.execute(text("SELECT 1"))
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logger.info("database connection check succeeded", extra={"event": "db_check"})
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def close_db_engine() -> None:
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engine.dispose()
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logger.info("database engine disposed", extra={"event": "db_close"})
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