adds missing errors file

Author: pcrespov

packages/postgres-database/src/simcore_postgres_database/errors.py

@@ -0,0 +1,61 @@
+""" aiopg errors
+
+    StandardError
+    |__ Warning
+    |__ Error
+        |__ InterfaceError
+        |__ DatabaseError
+            |__ DataError
+            |__ OperationalError
+            |__ IntegrityError
+            |__ InternalError
+            |__ ProgrammingError
+            |__ NotSupportedError
+
+    - aiopg reuses DBAPI exceptions
+        SEE https://aiopg.readthedocs.io/en/stable/core.html?highlight=Exception#exceptions
+        SEE http://initd.org/psycopg/docs/module.html#dbapi-exceptions
+"""
+# NOTE: psycopg2.errors are created dynamically
+# pylint: disable=no-name-in-module
+
+from typing import Tuple
+
+from psycopg2 import DatabaseError, DataError
+from psycopg2 import Error as DBAPIError
+from psycopg2 import (
+    IntegrityError,
+    InterfaceError,
+    InternalError,
+    NotSupportedError,
+    OperationalError,
+    ProgrammingError,
+)
+from psycopg2.errors import ForeignKeyViolation, NotNullViolation, UniqueViolation
+
+assert issubclass(UniqueViolation, IntegrityError)  # nosec
+
+# TODO: see https://stackoverflow.com/questions/58740043/how-do-i-catch-a-psycopg2-errors-uniqueviolation-error-in-a-python-flask-app
+# from sqlalchemy.exc import IntegrityError
+#
+# from psycopg2.errors import UniqueViolation
+#
+#    try:
+#        s.commit()
+#   except IntegrityError as e:
+#        assert isinstance(e.orig, UniqueViolation)
+
+
+__all__: Tuple[str, ...] = (
+    "DatabaseError",
+    "DataError",
+    "DBAPIError",
+    "ForeignKeyViolation",
+    "IntegrityError",
+    "InterfaceError",
+    "InternalError",
+    "NotNullViolation",
+    "NotSupportedError",
+    "OperationalError",
+    "ProgrammingError",
+)