98 lines
3.4 KiB
Python
98 lines
3.4 KiB
Python
"""
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Application repository with database CRUD operations
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SPDX - License - Identifier: LGPL - 3.0 - or -later
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Copyright © 2022 Concordia CERC group
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Project Coder Guille Gutierrez Guillermo.GutierrezMorote@concordia.ca
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"""
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import logging
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import datetime
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from typing import Union, Dict
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from sqlalchemy import select
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from sqlalchemy.exc import SQLAlchemyError
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from hub.persistence import Repository
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from hub.persistence.models import Application as Model
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class Application(Repository):
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_instance = None
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def __init__(self, db_name: str, dotenv_path: str, app_env: str):
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super().__init__(db_name, dotenv_path, app_env)
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def __new__(cls, db_name, dotenv_path, app_env):
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"""
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Implemented for a singleton pattern
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"""
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if cls._instance is None:
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cls._instance = super(Application, cls).__new__(cls)
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return cls._instance
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def insert(self, name: str, description: str, application_uuid: str) -> Union[Model, Dict]:
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"""
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Inserts a new application
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:param name: Application name
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:param description: Application description
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:param application_uuid: Unique identifier for the application
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:return: application and dictionary
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"""
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application = self.get_by_uuid(application_uuid)
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if application is None:
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try:
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application = Model(name=name, description=description, application_uuid=application_uuid)
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self.session.add(application)
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self.session.commit()
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return application
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except SQLAlchemyError as err:
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logging.error(f'An error occurred while creating application: {err}')
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else:
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return {'message': f'An application with {application_uuid} application uuid, already exists'}
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def update(self, application_uuid: str, name: str, description: str) -> Union[Dict, None]:
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"""
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Updates an application
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:param application_uuid: the application uuid of the application to be updated
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:param name: the application name
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:param description: the application description
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:return:
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"""
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try:
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self.session.query(Model).filter(
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Model.application_uuid == application_uuid
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).update({'name': name, 'description': description, 'updated': datetime.datetime.utcnow()})
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self.session.commit()
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except SQLAlchemyError as err:
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logging.error(f'Error while updating application: {err}')
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return {'message': 'Error occurred while updating application'}
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def delete(self, application_uuid: str):
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"""
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Deletes an application with the application_uuid
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:param application_uuid: The application uuid
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:return: None
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"""
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try:
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self.session.query(Model).filter(Model.application_uuid == application_uuid).delete()
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self.session.flush()
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self.session.commit()
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except SQLAlchemyError as err:
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logging.error(f'Error while deleting application: {err}')
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def get_by_uuid(self, application_uuid: str) -> Union[Model, None]:
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"""
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Fetch Application based on the application uuid
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:param application_uuid: the application uuid
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:return: Application with the provided application_uuid or None
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"""
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try:
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result_set = self.session.execute(select(Model).where(
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Model.application_uuid == application_uuid)
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).first()
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if result_set is None:
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return None
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return result_set[0]
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except SQLAlchemyError as err:
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logging.error(f'Error while fetching application by application_uuid: {err}')
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