52 lines
1.4 KiB
Python
52 lines
1.4 KiB
Python
"""Database."""
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from datetime import datetime
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import flask
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import sqlalchemy
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from sqlalchemy import create_engine, func
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from sqlalchemy.engine import reflection
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from sqlalchemy.orm import scoped_session, sessionmaker
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session: sqlalchemy.orm.scoping.scoped_session = scoped_session(sessionmaker())
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timeout = 2_000 # 20 seconds
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def init_db(db_url: str, echo: bool = False) -> None:
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"""Initialise database."""
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session.configure(bind=get_engine(db_url, echo=echo))
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def get_engine(db_url: str, echo: bool = False) -> sqlalchemy.engine.base.Engine:
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"""Create an engine object."""
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return create_engine(
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db_url,
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pool_recycle=3600,
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echo=echo,
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connect_args={
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"options": f"-c lock_timeout={timeout} -c statement_timeout={timeout}"
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},
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)
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def get_tables() -> list[str]:
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"""Get a list of table names."""
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tables: list[str] = reflection.Inspector.from_engine(session.bind).get_table_names()
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return tables
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def init_app(app: flask.app.Flask, echo: bool = False) -> None:
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"""Initialise database connection within flask app."""
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db_url = app.config["DB_URL"]
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session.configure(bind=get_engine(db_url, echo=echo))
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@app.teardown_appcontext
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def shutdown_session(exception: BaseException | None = None) -> None:
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session.remove()
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def now_utc() -> sqlalchemy.sql.functions.Function[datetime]:
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"""Now with UTC timezone."""
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return func.timezone("utc", func.now())
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