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"""Handle connection to auth database."""
import sqlite3
import logging
import contextlib
from typing import Any, Protocol, Callable, Iterator
import traceback
from flask import current_app
from .protocols import DbCursor
class DbConnection(Protocol):
"""Type annotation for a generic database connection object."""
def cursor(self) -> Any:
"""A cursor object"""
raise NotImplementedError
def commit(self) -> Any:
"""Commit the transaction."""
raise NotImplementedError
def rollback(self) -> Any:
"""Rollback the transaction."""
raise NotImplementedError
@contextlib.contextmanager
def connection(db_path: str, row_factory: Callable = sqlite3.Row) -> Iterator[DbConnection]:
"""Create the connection to the auth database."""
logging.debug("SQLite3 DB Path: '%s'.", db_path)
conn = sqlite3.connect(db_path)
conn.row_factory = row_factory
conn.set_trace_callback(logging.debug)
conn.execute("PRAGMA foreign_keys = ON")
try:
yield conn
except sqlite3.Error as exc:
conn.rollback()
logging.debug(traceback.format_exc())
raise exc
finally:
conn.commit()
conn.close()
@contextlib.contextmanager
def cursor(conn: DbConnection) -> Iterator[DbCursor]:
"""Get a cursor from the given connection to the auth database."""
cur = conn.cursor()
try:
yield cur
except sqlite3.Error as exc:
conn.rollback()
logging.debug(traceback.format_exc())
raise exc
finally:
conn.commit()
cur.close()
def with_db_connection(func: Callable[[DbConnection], Any]) -> Any:
"""
Takes a function of one argument `func`, whose one argument is a database
connection.
"""
db_uri = current_app.config["AUTH_DB"]
with connection(db_uri) as conn:
return func(conn)
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