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'''
A utility class to manage aliases &
interact with the database.
Verified: 2021 February 7
* Follows PEP8
* Tested Platforms
* Windows 10
'''
from server.database import Database
from server.error import ServerError
from server.console import Console
from shared.state import Static
class Alias:
__TABLE_NAME = 'aliases'
__TABLE_KWARGS = {
'key': 'text',
'value': 'text'
}
def __init__(self, ret):
self.__ret = ret
self.__db = Database()
self.__db.create_table(Alias.__TABLE_NAME,
**Alias.__TABLE_KWARGS)
self.__db.commit()
self.__alias = self.__db.read(Alias.__TABLE_NAME)
@ServerError.quiet
def __del__(self):
self.__db.close()
def add(self, key, value):
if self.alias_exists(key):
return Console.printf('Alias key already exists',
Static.WARNING, ret=self.__ret)
else:
self.__db.write(Alias.__TABLE_NAME, (key, value))
self.__db.commit()
return Console.printf('Alias add complete',
Static.SUCCESS, ret=self.__ret)
def remove(self, key):
if self.alias_exists(key):
self.__db.delete(Alias.__TABLE_NAME, ('key', '=', key))
self.__db.commit()
return Console.printf('Alias remove complete',
Static.SUCCESS, ret=self.__ret)
else:
return Console.printf('Alias key does not exist',
Static.WARNING, ret=self.__ret)
def update(self, key, new_key, new_value):
if self.alias_exists(key):
self.__db.execute('DELETE FROM {} WHERE key=? OR key=?'.format(
Alias.__TABLE_NAME), (key, new_key))
self.__db.write(Alias.__TABLE_NAME, (new_key, new_value))
self.__db.commit()
return Console.printf('Alias value update complete',
Static.SUCCESS, ret=self.__ret)
else:
return Console.printf('Alias key does not exist',
Static.WARNING, ret=self.__ret)
def list(self):
if self.__alias:
return Console.tabulate(self.__alias,
('Key', 'Value'), self.__ret)
else:
return Console.printf('No aliases exists',
Static.INFO, ret=self.__ret)
def alias_exists(self, compare_key, ret_value=False):
for key, value in self.__alias:
if compare_key == key:
if ret_value:
return value
else:
return True
else:
return False
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