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exceptions.py
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exceptions.py
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"""
This module contains my custom exception classes
for raising errors specific to the movie rating database
e.g. InvalidMovieError, InvalidUserError
"""
import Pyro4
from Pyro4.util import SerializerBase
# Use serpent serialization
Pyro4.config.SERIALIZER = "serpent"
class InvalidMovieError(Exception):
"""
This is a custom exception class
This exception is thrown when there is a problem retrieving a movie
A description of the issue is provided on initialisation
"""
def __init__(self, message, *args):
self.message = message
super(InvalidMovieError, self).__init__(message, *args)
def __str__(self) -> str:
return str(self.to_dict())
def to_dict(self) -> dict:
"""
Serpent serialization requires to_dict
Represent class InvalidMovieError as a dictionary
:return: A dictionary representation of this InvalidMovieError
"""
return {
"__class__": "InvalidMovieError",
"message": self.message
}
@staticmethod
def to_class(class_name: str, dictionary: dict) -> 'InvalidMovieError':
"""
This converts a dictionary representing an InvalidMovieError
to an object of type InvalidMovieError
:param class_name: parameter is required for serialization
:param dictionary: dictionary representing an InvalidMovieError
:return:
"""
del class_name
return InvalidMovieError(dictionary["message"])
class InvalidUserError(Exception):
"""
This is a custom exception class
This exception is thrown when there is an issue with the provided user_id
A description of the issue can be provided on initialisation
"""
def __init__(self, message, *args):
self.message = message
super(InvalidUserError, self).__init__(message, *args)
def __str__(self):
return str(self.to_dict())
def to_dict(self) -> dict:
"""
Serpent serialization requires to_dict
Represent class InvalidUserError as a dictionary
:return: A dictionary representation of this InvalidUserError
"""
return {
"__class__": "InvalidUserError",
"message": self.message
}
@staticmethod
def to_class(class_name: str, dictionary: dict) -> 'InvalidUserError':
"""
This converts a dictionary representing an InvalidUserError
to an object of type InvalidUserError
This exception is thrown when there is a problem with the provided user_id
:param class_name: parameter is required for serialization
:param dictionary: dictionary representing an InvalidUserError
:return:
"""
del class_name
return InvalidUserError(dictionary["message"])
# Register serialization and deserialization hooks for InvalidUserError and InvalidMovieError
SerializerBase.register_class_to_dict(InvalidUserError, InvalidUserError.to_dict)
SerializerBase.register_dict_to_class("InvalidUserError", InvalidUserError.to_class)
SerializerBase.register_class_to_dict(InvalidMovieError, InvalidMovieError.to_dict)
SerializerBase.register_dict_to_class("InvalidMovieError", InvalidMovieError.to_class)