Volume discovery and local storage management lib
You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
 
 
os-brick/os_brick/exception.py

230 lines
7.1 KiB

# (c) Copyright 2013 Hewlett-Packard Development Company, L.P.
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
"""Exceptions for the Brick library."""
from oslo_concurrency import processutils as putils
import six
import traceback
from os_brick.i18n import _
from oslo_log import log as logging
LOG = logging.getLogger(__name__)
class BrickException(Exception):
"""Base Brick Exception
To correctly use this class, inherit from it and define
a 'msg_fmt' property. That msg_fmt will get printf'd
with the keyword arguments provided to the constructor.
"""
message = _("An unknown exception occurred.")
code = 500
headers = {}
safe = False
def __init__(self, message=None, **kwargs):
self.kwargs = kwargs
if 'code' not in self.kwargs:
try:
self.kwargs['code'] = self.code
except AttributeError:
pass
if not message:
try:
message = self.message % kwargs
except Exception:
# kwargs doesn't match a variable in the message
# log the issue and the kwargs
LOG.exception("Exception in string format operation. "
"msg='%s'", self.message)
for name, value in kwargs.items():
LOG.error("%(name)s: %(value)s", {'name': name,
'value': value})
# at least get the core message out if something happened
message = self.message
# Put the message in 'msg' so that we can access it. If we have it in
# message it will be overshadowed by the class' message attribute
self.msg = message
super(BrickException, self).__init__(message)
def __unicode__(self):
return six.text_type(self.msg)
class NotFound(BrickException):
message = _("Resource could not be found.")
code = 404
safe = True
class Invalid(BrickException):
message = _("Unacceptable parameters.")
code = 400
# Cannot be templated as the error syntax varies.
# msg needs to be constructed when raised.
class InvalidParameterValue(Invalid):
message = _("%(err)s")
class NoFibreChannelHostsFound(BrickException):
message = _("We are unable to locate any Fibre Channel devices.")
class NoFibreChannelVolumeDeviceFound(BrickException):
message = _("Unable to find a Fibre Channel volume device.")
class VolumeNotDeactivated(BrickException):
message = _('Volume %(name)s was not deactivated in time.')
class VolumeDeviceNotFound(BrickException):
message = _("Volume device not found at %(device)s.")
class VolumePathsNotFound(BrickException):
message = _("Could not find any paths for the volume.")
class VolumePathNotRemoved(BrickException):
message = _("Volume path %(volume_path)s was not removed in time.")
class ProtocolNotSupported(BrickException):
message = _("Connect to volume via protocol %(protocol)s not supported.")
class TargetPortalNotFound(BrickException):
message = _("Unable to find target portal %(target_portal)s.")
class TargetPortalsNotFound(TargetPortalNotFound):
message = _("Unable to find target portal in %(target_portals)s.")
class FailedISCSITargetPortalLogin(BrickException):
message = _("Unable to login to iSCSI Target Portal")
class BlockDeviceReadOnly(BrickException):
message = _("Block device %(device)s is Read-Only.")
class VolumeGroupNotFound(BrickException):
message = _("Unable to find Volume Group: %(vg_name)s")
class VolumeGroupCreationFailed(BrickException):
message = _("Failed to create Volume Group: %(vg_name)s")
class CommandExecutionFailed(BrickException):
message = _("Failed to execute command %(cmd)s")
class VolumeDriverException(BrickException):
message = _('An error occurred while IO to volume %(name)s.')
class InvalidIOHandleObject(BrickException):
message = _('IO handle of %(protocol)s has wrong object '
'type %(actual_type)s.')
class VolumeEncryptionNotSupported(Invalid):
message = _("Volume encryption is not supported for %(volume_type)s "
"volume %(volume_id)s.")
# NOTE(mriedem): This extends ValueError to maintain backward compatibility.
class InvalidConnectorProtocol(ValueError):
pass
class ExceptionChainer(BrickException):
"""A Exception that can contain a group of exceptions.
This exception serves as a container for exceptions, useful when we want to
store all exceptions that happened during a series of steps and then raise
them all together as one.
The representation of the exception will include all exceptions and their
tracebacks.
This class also includes a context manager for convenience, one that will
support both swallowing the exception as if nothing had happened and
raising the exception. In both cases the exception will be stored.
If a message is provided to the context manager it will be formatted and
logged with warning level.
"""
def __init__(self, *args, **kwargs):
self._exceptions = []
self._repr = None
super(ExceptionChainer, self).__init__(*args, **kwargs)
def __repr__(self):
# Since generating the representation can be slow we cache it
if not self._repr:
tracebacks = (
''.join(traceback.format_exception(*e)).replace('\n', '\n\t')
for e in self._exceptions)
self._repr = '\n'.join('\nChained Exception #%s\n\t%s' % (i + 1, t)
for i, t in enumerate(tracebacks))
return self._repr
__str__ = __unicode__ = __repr__
def __nonzero__(self):
# We want to be able to do boolean checks on the exception
return bool(self._exceptions)
__bool__ = __nonzero__ # For Python 3
def add_exception(self, exc_type, exc_val, exc_tb):
# Clear the representation cache
self._repr = None
self._exceptions.append((exc_type, exc_val, exc_tb))
def context(self, catch_exception, msg='', *msg_args):
self._catch_exception = catch_exception
self._exc_msg = msg
self._exc_msg_args = msg_args
return self
def __enter__(self):
return self
def __exit__(self, exc_type, exc_val, exc_tb):
if exc_type:
self.add_exception(exc_type, exc_val, exc_tb)
if self._exc_msg:
LOG.warning(self._exc_msg, *self._exc_msg_args)
if self._catch_exception:
return True
class ExecutionTimeout(putils.ProcessExecutionError):
pass