139 lines
4.5 KiB
Python
139 lines
4.5 KiB
Python
"""
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City 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 Peter Yefi peteryefi@gmail.com
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"""
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import datetime
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import logging
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from sqlalchemy import select
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from sqlalchemy.exc import SQLAlchemyError
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from sqlalchemy.orm import Session
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from hub.city_model_structure.city import City as CityHub
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from hub.persistence.repository import Repository
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from hub.persistence.models import City as Model
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from hub.persistence.models import CityObject
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from hub.version import __version__
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class City(Repository):
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"""
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City repository
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"""
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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(City, cls).__new__(cls)
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return cls._instance
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def insert(self, city: CityHub, pickle_path, scenario, application_id, user_id: int):
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"""
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Inserts a city
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:param city: The complete city instance
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:param pickle_path: Path to the pickle
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:param scenario: Simulation scenario name
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:param application_id: Application id owning the instance
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:param user_id: User id owning the instance
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:return: Identity id
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"""
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city.save_compressed(pickle_path)
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try:
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db_city = Model(
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pickle_path,
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city.name,
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scenario,
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application_id,
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user_id,
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__version__)
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with Session(self.engine) as session:
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session.add(db_city)
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session.flush()
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session.commit()
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for building in city.buildings:
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db_city_object = CityObject(db_city.id,
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building)
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session.add(db_city_object)
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session.flush()
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session.commit()
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session.refresh(db_city)
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return db_city.id
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except SQLAlchemyError as err:
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logging.error('An error occurred while creating a city %s', err)
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raise SQLAlchemyError from err
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def update(self, city_id: int, city: CityHub):
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"""
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Updates a city name (other updates makes no sense)
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:param city_id: the id of the city to be updated
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:param city: the city object
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:return: None
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"""
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try:
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now = datetime.datetime.utcnow()
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with Session(self.engine) as session:
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session.query(Model).filter(Model.id == city_id).update({'name': city.name, 'updated': now})
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session.commit()
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except SQLAlchemyError as err:
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logging.error('Error while updating city %s', err)
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raise SQLAlchemyError from err
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def delete(self, city_id: int):
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"""
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Deletes a City with the id
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:param city_id: the city id
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:return: None
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"""
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try:
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with Session(self.engine) as session:
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session.query(CityObject).filter(CityObject.city_id == city_id).delete()
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session.query(Model).filter(Model.id == city_id).delete()
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session.commit()
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except SQLAlchemyError as err:
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logging.error('Error while fetching city %s', err)
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raise SQLAlchemyError from err
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def get_by_user_id_application_id_and_scenario(self, user_id, application_id, scenario) -> [Model]:
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"""
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Fetch city based on the user who created it
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:param user_id: the user id
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:param application_id: the application id
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:param scenario: simulation scenario name
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:return: [ModelCity]
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"""
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try:
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with Session(self.engine) as session:
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result_set = session.execute(select(Model).where(Model.user_id == user_id,
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Model.application_id == application_id,
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Model.scenario == scenario
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)).all()
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return result_set
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except SQLAlchemyError as err:
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logging.error('Error while fetching city by name %s', err)
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raise SQLAlchemyError from err
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def get_by_user_id_and_application_id(self, user_id, application_id) -> [Model]:
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"""
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Fetch city based on the user who created it
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:param user_id: the user id
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:param application_id: the application id
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:return: ModelCity
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"""
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try:
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with Session(self.engine) as session:
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result_set = session.execute(
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select(Model).where(Model.user_id == user_id, Model.application_id == application_id)
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)
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return [r[0] for r in result_set]
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except SQLAlchemyError as err:
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logging.error('Error while fetching city by name %s', err)
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raise SQLAlchemyError from err
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