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# Copyright (C) 2015 Custodia Project Contributors - see LICENSE file
class InvalidMessage(Exception):
"""Invalid Message.
This exception is raised when a message cannot be parsed
or validated.
"""
pass
class UnknownMessageType(Exception):
"""Unknown Message Type.
This exception is raised when a message is of an unknown
type.
"""
pass
class UnallowedMessage(Exception):
"""Unallowed Message.
This exception is raise when the message type is know but
is not allowed.
"""
pass
class MessageHandler(object):
def __init__(self, request):
self.req = request
self.payload = None
def parse(self, msg, name):
"""Parses the message.
:param req: the original request
:param msg: a decoded json string with the incoming message
:raises InvalidMessage: if the message cannot be parsed or validated
"""
raise NotImplementedError
def reply(self, output):
"""Generates a reply.
:param req: the original request
:param output: a json string with the stored output payload
"""
raise NotImplementedError
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