jwmud/jwmudlib/jwmu_exceptions.py

# This file is part of jwmud, written by Helmut Pozimski in 2014.
#
#       jwmud is free software: you can redistribute it and/or modify
#       it under the terms of the GNU General Public License as published by
#       the Free Software Foundation, version 2 of the License.
#
#       jwmud is distributed in the hope that it will be useful,
#       but WITHOUT ANY WARRANTY; without even the implied warranty of
#       MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#       GNU General Public License for more details.
#
#       You should have received a copy of the GNU General Public License
#       along with jwmud.  If not, see <http://www.gnu.org/licenses/>.

# -*- coding: utf8 -*-


class DataBaseAccessFailed(Exception):
    """This exception will be raised when opening or creating the database
    failed.

    """
    def __init__(self):
        self.__message = "Accessing the database failed!"

    def __str__(self):
        return self.__message


class DataBaseWriteFailed(Exception):
    """This exception will be raised when a write access to the database
    failed.

    """
    def __init__(self):
        self.__message = "Writing to the database failed, requested action " \
                         "aborted !"

    def __str__(self):
        return self.__message


class WrongParameters(Exception):
    """This exception will be raised when the number of parameters or their
    value is wrong.

    """
    def __init__(self):
        self.__message = "The wrong number or values of parameters where " \
                         "given to the function, the requested action failed."

    def __str__(self):
        return self.__message


class CategoryNotFound(Exception):
    """This exception will be raised when the user tries to access a category
    that does not exist in the database.

    """
    def __init__(self):
        self.__message = "The category could not be found in the database."

    def __str__(self):
        return self.__message


class DayAlreadyInDatabase(Exception):
    """This exception will be raised when the user tries to add a day to the
    database which does already have an entry there.

    """
    def __init__(self):
        self.__message = "This day already exists in the database."

    def __str__(self):
        return self.__message

class ConfigurationFileMissing(Exception):
    """This exception will be raised when the configuration file is
    missing.

    """
    def __init__(self):
        self.__message = "The configuration file does not exist."

    def __str__(self):
        return self.__message

class ConfigurationFileAccessDenied(Exception):
    """This exception will be raised when the access to the configuration
    file is denied by it's permissions.

    """
    def __init__(self):
        self.__message = "The configuration file could not be opened " \
                         "for reading."

    def __str__(self):
        return self.__message

class PasswdOrGroupAccessFailed(Exception):
    """This exception will be raised when accessing either /etc/passwd or
    /etc/group failed.

    """
    def __init__(self):
        self.__message = "Opening /etc/passwd or /etc/group failed."

    def __str__(self):
        return self.__message

class DaemonAlreadyRunning(Exception):
    """This exception will be raised when another process is already
    running.

    """
    def __init__(self):
        self.__message = "Another process is already running, exiting."

    def __str__(self):
        return self.__message

class WritingPIDFileFailed(Exception):
    """This exception will be raised when creating the PID file failed."""
    def __init__(self):
        self.__message = "The PID file could not be created, please check if " \
                         "/run or /var/run exist and are writable."

    def __str__(self):
        return  self.__message