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from typing import TYPE_CHECKING, Optional, Type, Union
from django import db
if TYPE_CHECKING:
from psycopg2 import Error as _Psycopg2Error
Psycopg2Error: Optional[Type[_Psycopg2Error]]
from psycopg import Error as _Psycopg3Error
Psycopg3Error: Optional[Type[_Psycopg3Error]]
try:
from psycopg2 import Error as Psycopg2Error # type: ignore[no-redef]
except ImportError:
Psycopg2Error = None # type: ignore[misc]
try:
from psycopg import Error as Psycopg3Error # type: ignore[no-redef]
except ImportError:
Psycopg3Error = None # type: ignore[misc]
def extract_postgres_error(
error: db.Error,
) -> Optional[Union["_Psycopg2Error", "_Psycopg3Error"]]:
"""Extracts the underlying :see:psycopg2.Error from the specified Django
database error.
As per PEP-249, Django wraps all database errors in its own
exception. We can extract the underlying database error by examaning
the cause of the error.
"""
if (Psycopg2Error and not isinstance(error.__cause__, Psycopg2Error)) and (
Psycopg3Error and not isinstance(error.__cause__, Psycopg3Error)
):
return None
return error.__cause__
def extract_postgres_error_code(error: db.Error) -> Optional[str]:
"""Extracts the underlying Postgres error code.
As per PEP-249, Django wraps all database errors in its own
exception. We can extract the underlying database error by examaning
the cause of the error.
"""
cause = error.__cause__
if not cause:
return None
if Psycopg2Error and isinstance(cause, Psycopg2Error):
return cause.pgcode
if Psycopg3Error and isinstance(cause, Psycopg3Error):
return cause.sqlstate
return None
|
