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|
"""Handle connection to auth database."""
import sqlite3
import contextlib
from typing import Any, Callable, Iterator, Protocol
import traceback
from flask import current_app as app
class DbConnection(Protocol):
"""Type annotation for a generic database connection object."""
def cursor(self) -> Any:
"""A cursor object"""
...
def commit(self) -> Any:
"""Commit the transaction."""
...
def rollback(self) -> Any:
"""Rollback the transaction."""
...
class DbCursor(Protocol):
"""Type annotation for a generic database cursor object."""
def execute(self, *args, **kwargs) -> Any:
"""Execute a single query"""
...
def executemany(self, *args, **kwargs) -> Any:
"""
Execute parameterized SQL statement sql against all parameter sequences
or mappings found in the sequence parameters.
"""
...
def fetchone(self, *args, **kwargs):
"""Fetch single result if present, or `None`."""
...
def fetchmany(self, *args, **kwargs):
"""Fetch many results if present or `None`."""
...
def fetchall(self, *args, **kwargs):
"""Fetch all results if present or `None`."""
...
@contextlib.contextmanager
def connection(db_path: str, row_factory: Callable = sqlite3.Row) -> Iterator[DbConnection]:
"""Create the connection to the auth database."""
conn = sqlite3.connect(db_path)
conn.row_factory = row_factory
try:
yield conn
except sqlite3.Error as exc:
conn.rollback()
app.logger.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()
app.logger.debug(traceback.format_exc())
raise exc
finally:
conn.commit()
cur.close()
|
