digidotcom/python-suitcase

# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, You can obtain one at http://mozilla.org/MPL/2.0/.
#
# Copyright (c) 2015 Digi International Inc. All Rights Reserved.

"""Define an exception hierarchy used within Suitcase

The basic rule is that users of the Suitcase library should always
be able to catch the base :class:`.SuitcaseException` and be confident
that they will not get some other random exception.  Catching
more specific subclasses of this exception should then be possible.

There are still some cases (especially when constructing a field) that
base exceptions (like TypeError, ValueError, or TypeError) might still be
raised.  In general, however, any case where things are dynamic, we do
our best to raise a :class:`.SuitcaseException` with meaningful information.
"""


class SuitcaseException(Exception):
    """Base exception acting as the root for other exceptions"""


class SuitcaseChecksumException(SuitcaseException):
    """Exception raised when a checksum does not match"""


class SuitcaseProgrammingError(SuitcaseException):
    """Exception raised when somebody is doing something wrong"""


class SuitcaseParseError(SuitcaseException):
    """Raised when there is a problem parsing bytes into a suitcase schema"""


class SuitcasePackException(SuitcaseException):
    """Raised when there is an error packing a message"""


class SuitcasePackStructException(SuitcasePackException):
    """Raised on an error packing a struct field"""

    def __init__(self, struct_exception):
        self.struct_exception = struct_exception

    def __repr__(self):
        return repr(self.struct_exception)

    def __str__(self):
        return str(self.struct_exception)