# ------------------------------------------------------------------------
# Copyright (c) Microsoft Corporation. All rights reserved.
# Licensed under the MIT License. See License.txt in the project root for
# license information.
# -------------------------------------------------------------------------
from uamqp import errors, constants
from ._common.constants import SESSION_LOCK_LOST, SESSION_LOCK_TIMEOUT
_NO_RETRY_ERRORS = (
constants.ErrorCodes.DecodeError,
constants.ErrorCodes.LinkMessageSizeExceeded,
constants.ErrorCodes.NotFound,
constants.ErrorCodes.NotImplemented,
constants.ErrorCodes.LinkRedirect,
constants.ErrorCodes.NotAllowed,
constants.ErrorCodes.UnauthorizedAccess,
constants.ErrorCodes.LinkStolen,
constants.ErrorCodes.ResourceLimitExceeded,
constants.ErrorCodes.ConnectionRedirect,
constants.ErrorCodes.PreconditionFailed,
constants.ErrorCodes.InvalidField,
constants.ErrorCodes.ResourceDeleted,
constants.ErrorCodes.IllegalState,
constants.ErrorCodes.FrameSizeTooSmall,
constants.ErrorCodes.ConnectionFramingError,
constants.ErrorCodes.SessionUnattachedHandle,
constants.ErrorCodes.SessionHandleInUse,
constants.ErrorCodes.SessionErrantLink,
constants.ErrorCodes.SessionWindowViolation,
b"com.microsoft:argument-out-of-range",
b"com.microsoft:entity-disabled",
b"com.microsoft:auth-failed",
b"com.microsoft:precondition-failed",
b"com.microsoft:argument-error")
def _error_handler(error):
"""Handle connection and service errors.
Called internally when an event has failed to send so we
can parse the error to determine whether we should attempt
to retry sending the event again.
Returns the action to take according to error type.
:param error: The error received in the send attempt.
:type error: Exception
:rtype: ~uamqp.errors.ErrorAction
"""
if error.condition == b'com.microsoft:server-busy':
return errors.ErrorAction(retry=True, backoff=4)
if error.condition == b'com.microsoft:timeout':
return errors.ErrorAction(retry=True, backoff=2)
if error.condition == b'com.microsoft:operation-cancelled':
return errors.ErrorAction(retry=True)
if error.condition == b"com.microsoft:container-close":
return errors.ErrorAction(retry=True, backoff=4)
if error.condition in _NO_RETRY_ERRORS:
return errors.ErrorAction(retry=False)
return errors.ErrorAction(retry=True)
def _create_servicebus_exception(logger, exception, handler): # pylint: disable=too-many-statements
error_need_close_handler = True
error_need_raise = False
if isinstance(exception, errors.MessageAlreadySettled):
logger.info("Message already settled (%r)", exception)
error = MessageAlreadySettled(exception)
error_need_close_handler = False
error_need_raise = True
elif isinstance(exception, errors.MessageContentTooLarge) or \
(isinstance(exception, errors.MessageException) and
exception.condition == constants.ErrorCodes.LinkMessageSizeExceeded):
logger.info("Message content is too large (%r)", exception)
error = MessageContentTooLarge(exception)
error_need_close_handler = False
error_need_raise = True
elif isinstance(exception, errors.MessageException):
logger.info("Message send failed (%r)", exception)
error = MessageSendFailed(exception)
error_need_raise = False
elif isinstance(exception, errors.LinkDetach) and exception.condition == SESSION_LOCK_LOST:
try:
session_id = handler._session_id # pylint: disable=protected-access
except AttributeError:
session_id = None
error = SessionLockExpired("Connection detached - lock on Session {} lost.".format(session_id))
error_need_raise = True
elif isinstance(exception, errors.LinkDetach) and exception.condition == SESSION_LOCK_TIMEOUT:
error = NoActiveSession("Queue has no active session to receive from.")
error_need_raise = True
elif isinstance(exception, errors.AuthenticationException):
logger.info("Authentication failed due to exception: (%r).", exception)
error = ServiceBusAuthenticationError(str(exception), exception)
elif isinstance(exception, (errors.LinkDetach, errors.ConnectionClose)):
logger.info("Handler detached due to exception: (%r).", exception)
if exception.condition == constants.ErrorCodes.UnauthorizedAccess:
error = ServiceBusAuthorizationError(str(exception), exception)
else:
error = ServiceBusConnectionError(str(exception), exception)
elif isinstance(exception, errors.MessageHandlerError):
logger.info("Handler error: (%r).", exception)
error = ServiceBusConnectionError(str(exception), exception)
elif isinstance(exception, errors.AMQPConnectionError):
logger.info("Failed to open handler: (%r).", exception)
message = "Failed to open handler: {}.".format(exception)
error = ServiceBusConnectionError(message, exception)
error_need_raise, error_need_close_handler = True, False
else:
logger.info("Unexpected error occurred (%r). Shutting down.", exception)
error = exception
if not isinstance(exception, ServiceBusError):
error = ServiceBusError("Handler failed: {}.".format(exception))
try:
err_condition = exception.condition
if err_condition in _NO_RETRY_ERRORS:
error_need_raise = True
except AttributeError:
pass
return error, error_need_close_handler, error_need_raise
class _ServiceBusErrorPolicy(errors.ErrorPolicy):
def __init__(self, max_retries=3, is_session=False):
self._is_session = is_session
super(_ServiceBusErrorPolicy, self).__init__(max_retries=max_retries, on_error=_error_handler)
def on_unrecognized_error(self, error):
if self._is_session:
return errors.ErrorAction(retry=False)
return super(_ServiceBusErrorPolicy, self).on_unrecognized_error(error)
def on_link_error(self, error):
if self._is_session:
return errors.ErrorAction(retry=False)
return super(_ServiceBusErrorPolicy, self).on_link_error(error)
def on_connection_error(self, error):
if self._is_session:
return errors.ErrorAction(retry=False)
return super(_ServiceBusErrorPolicy, self).on_connection_error(error)
[docs]class ServiceBusError(Exception):
"""An error occured.
This is the parent of all Service Bus errors and can
be used for default error handling.
"""
def __init__(self, message, inner_exception=None):
self.inner_exception = inner_exception
super(ServiceBusError, self).__init__(message)
[docs]class ServiceBusResourceNotFound(ServiceBusError):
"""The Service Bus entity could not be reached."""
[docs]class ServiceBusConnectionError(ServiceBusError):
"""An error occured in the connection."""
[docs]class ServiceBusAuthorizationError(ServiceBusError):
"""An error occured when authorizing the connection."""
[docs]class ServiceBusAuthenticationError(ServiceBusError):
"""An error occured when authenticate the connection."""
[docs]class NoActiveSession(ServiceBusError):
"""No active Sessions are available to receive from."""
[docs]class OperationTimeoutError(ServiceBusError):
"""Operation timed out."""
[docs]class MessageError(ServiceBusError):
"""A message failed to send because the message is in a wrong state"""
[docs]class MessageContentTooLarge(MessageError, ValueError):
"""Message content is larger than the service bus frame size"""
[docs]class MessageAlreadySettled(MessageError):
"""Failed to settle the message.
An attempt was made to complete an operation on a message that has already
been settled (completed, abandoned, dead-lettered or deferred).
This error will also be raised if an attempt is made to settle a message
received via ReceiveAndDelete mode.
"""
def __init__(self, action):
message = "Unable to {} message as it has already been settled".format(action)
super(MessageAlreadySettled, self).__init__(message)
[docs]class MessageSettleFailed(ServiceBusError):
"""Attempt to settle a message failed."""
def __init__(self, action, inner_exception):
message = "Failed to {} message. Error: {}".format(action, inner_exception)
self.inner_exception = inner_exception
super(MessageSettleFailed, self).__init__(message, inner_exception)
[docs]class MessageSendFailed(ServiceBusError):
"""A message failed to send to the Service Bus entity."""
def __init__(self, inner_exception):
message = "Message failed to send. Error: {}".format(inner_exception)
self.condition = None
self.description = None
if hasattr(inner_exception, 'condition'):
self.condition = inner_exception.condition
self.description = inner_exception.description
self.inner_exception = inner_exception
super(MessageSendFailed, self).__init__(message, inner_exception)
[docs]class MessageLockExpired(ServiceBusError):
"""The lock on the message has expired and it has been released back to the queue.
It will need to be received again in order to settle it.
"""
def __init__(self, message=None, inner_exception=None):
message = message or "Message lock expired"
super(MessageLockExpired, self).__init__(message, inner_exception=inner_exception)
[docs]class SessionLockExpired(ServiceBusError):
"""The lock on the session has expired.
All unsettled messages that have been received can no longer be settled.
"""
def __init__(self, message=None, inner_exception=None):
message = message or "Session lock expired"
super(SessionLockExpired, self).__init__(message, inner_exception=inner_exception)
[docs]class AutoLockRenewFailed(ServiceBusError):
"""An attempt to renew a lock on a message or session in the background has failed."""
[docs]class AutoLockRenewTimeout(ServiceBusError):
"""The time allocated to renew the message or session lock has elapsed."""