288 lines
8.6 KiB
Python
288 lines
8.6 KiB
Python
# Copyright 2010 United States Government as represented by the
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# Administrator of the National Aeronautics and Space Administration.
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# All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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"""DB related custom exceptions.
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Custom exceptions intended to determine the causes of specific database
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errors. This module provides more generic exceptions than the database-specific
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driver libraries, and so users of oslo.db can catch these no matter which
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database the application is using. Most of the exceptions are wrappers. Wrapper
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exceptions take an original exception as positional argument and keep it for
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purposes of deeper debug.
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Example::
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try:
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statement(arg)
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except sqlalchemy.exc.OperationalError as e:
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raise DBDuplicateEntry(e)
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This is useful to determine more specific error cases further at execution,
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when you need to add some extra information to an error message. Wrapper
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exceptions takes care about original error message displaying to not to loose
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low level cause of an error. All the database api exceptions wrapped into
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the specific exceptions provided belove.
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Please use only database related custom exceptions with database manipulations
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with `try/except` statement. This is required for consistent handling of
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database errors.
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"""
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from oslo_utils.excutils import CausedByException
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from oslo_db._i18n import _
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class DBError(CausedByException):
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"""Base exception for all custom database exceptions.
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:kwarg inner_exception: an original exception which was wrapped with
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DBError or its subclasses.
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"""
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def __init__(self, inner_exception=None, cause=None):
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self.inner_exception = inner_exception
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super(DBError, self).__init__(str(inner_exception), cause)
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class DBDuplicateEntry(DBError):
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"""Duplicate entry at unique column error.
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Raised when made an attempt to write to a unique column the same entry as
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existing one. :attr: `columns` available on an instance of the exception
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and could be used at error handling::
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try:
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instance_type_ref.save()
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except DBDuplicateEntry as e:
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if 'colname' in e.columns:
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# Handle error.
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:kwarg columns: a list of unique columns have been attempted to write a
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duplicate entry.
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:type columns: list
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:kwarg value: a value which has been attempted to write. The value will
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be None, if we can't extract it for a particular database backend. Only
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MySQL and PostgreSQL 9.x are supported right now.
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"""
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def __init__(self, columns=None, inner_exception=None, value=None):
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self.columns = columns or []
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self.value = value
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super(DBDuplicateEntry, self).__init__(inner_exception)
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class DBConstraintError(DBError):
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"""Check constraint fails for column error.
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Raised when made an attempt to write to a column a value that does not
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satisfy a CHECK constraint.
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:kwarg table: the table name for which the check fails
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:type table: str
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:kwarg check_name: the table of the check that failed to be satisfied
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:type check_name: str
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"""
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def __init__(self, table, check_name, inner_exception=None):
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self.table = table
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self.check_name = check_name
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super(DBConstraintError, self).__init__(inner_exception)
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class DBReferenceError(DBError):
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"""Foreign key violation error.
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:param table: a table name in which the reference is directed.
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:type table: str
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:param constraint: a problematic constraint name.
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:type constraint: str
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:param key: a broken reference key name.
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:type key: str
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:param key_table: a table name which contains the key.
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:type key_table: str
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"""
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def __init__(self, table, constraint, key, key_table,
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inner_exception=None):
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self.table = table
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self.constraint = constraint
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self.key = key
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self.key_table = key_table
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super(DBReferenceError, self).__init__(inner_exception)
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class DBNonExistentConstraint(DBError):
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"""Constraint does not exist.
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:param table: table name
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:type table: str
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:param constraint: constraint name
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:type table: str
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"""
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def __init__(self, table, constraint, inner_exception=None):
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self.table = table
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self.constraint = constraint
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super(DBNonExistentConstraint, self).__init__(inner_exception)
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class DBNonExistentTable(DBError):
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"""Table does not exist.
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:param table: table name
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:type table: str
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"""
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def __init__(self, table, inner_exception=None):
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self.table = table
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super(DBNonExistentTable, self).__init__(inner_exception)
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class DBNonExistentDatabase(DBError):
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"""Database does not exist.
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:param database: database name
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:type database: str
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"""
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def __init__(self, database, inner_exception=None):
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self.database = database
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super(DBNonExistentDatabase, self).__init__(inner_exception)
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class DBDeadlock(DBError):
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"""Database dead lock error.
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Deadlock is a situation that occurs when two or more different database
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sessions have some data locked, and each database session requests a lock
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on the data that another, different, session has already locked.
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"""
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def __init__(self, inner_exception=None):
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super(DBDeadlock, self).__init__(inner_exception)
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class DBInvalidUnicodeParameter(Exception):
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"""Database unicode error.
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Raised when unicode parameter is passed to a database
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without encoding directive.
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"""
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def __init__(self):
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super(DBInvalidUnicodeParameter, self).__init__(
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_("Invalid Parameter: Encoding directive wasn't provided."))
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class DBMigrationError(DBError):
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"""Wrapped migration specific exception.
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Raised when migrations couldn't be completed successfully.
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"""
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def __init__(self, message):
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super(DBMigrationError, self).__init__(message)
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class DBConnectionError(DBError):
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"""Wrapped connection specific exception.
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Raised when database connection is failed.
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"""
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pass
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class DBDataError(DBError):
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"""Raised for errors that are due to problems with the processed data.
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E.g. division by zero, numeric value out of range, incorrect data type, etc
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"""
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class DBNotSupportedError(DBError):
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"""Raised when a database backend has raised sqla.exc.NotSupportedError"""
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class InvalidSortKey(Exception):
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"""A sort key destined for database query usage is invalid."""
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def __init__(self, key=None):
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super(InvalidSortKey, self).__init__(
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_("Sort key supplied is invalid: %s") % key)
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self.key = key
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class ColumnError(Exception):
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"""Error raised when no column or an invalid column is found."""
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class BackendNotAvailable(Exception):
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"""Error raised when a particular database backend is not available
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within a test suite.
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"""
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class RetryRequest(Exception):
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"""Error raised when DB operation needs to be retried.
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That could be intentionally raised by the code without any real DB errors.
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"""
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def __init__(self, inner_exc):
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self.inner_exc = inner_exc
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class NoEngineContextEstablished(AttributeError):
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"""Error raised for enginefacade attribute access with no context.
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This applies to the ``session`` and ``connection`` attributes
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of a user-defined context and/or RequestContext object, when they
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are accessed *outside* of the scope of an enginefacade decorator
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or context manager.
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The exception is a subclass of AttributeError so that
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normal Python missing attribute behaviors are maintained, such
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as support for ``getattr(context, 'session', None)``.
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"""
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class ContextNotRequestedError(AttributeError):
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"""Error raised when requesting a not-setup enginefacade attribute.
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This applies to the ``session`` and ``connection`` attributes
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of a user-defined context and/or RequestContext object, when they
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are accessed *within* the scope of an enginefacade decorator
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or context manager, but the context has not requested that
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attribute (e.g. like "with enginefacade.connection.using(context)"
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and "context.session" is requested).
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"""
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class CantStartEngineError(Exception):
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"""Error raised when the enginefacade cannot start up correctly."""
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