145 lines
4.8 KiB
Python
145 lines
4.8 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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from city_model_structure.city import City
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from persistence import BaseRepo
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from sqlalchemy.exc import SQLAlchemyError
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from sqlalchemy import select
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from helpers.city_util import CityUtil
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from persistence.models import City as DBCity
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import pickle
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import requests
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from urllib3.exceptions import HTTPError
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from typing import Union, Dict
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class CityRepo(BaseRepo):
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_instance = None
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def __init__(self, db_name, app_env):
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super().__init__(db_name, app_env)
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self._city_util = CityUtil()
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def __new__(cls, db_name, 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(CityRepo, cls).__new__(cls)
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return cls._instance
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def insert(self, city: City) -> Union[City, Dict]:
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db_city = DBCity()
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db_city.name = city.name
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db_city.climate_reference_city = city.climate_reference_city
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db_city.srs_name = city.srs_name
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db_city.longitude = city.longitude
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db_city.latitude = city.latitude
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db_city.country_code = city.country_code
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db_city.time_zone = city.time_zone
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db_city.lower_corner = city.lower_corner.tolist()
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db_city.upper_corner = city.upper_corner.tolist()
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db_city.city = pickle.dumps(city)
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try:
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# Retrieve hub project latest release
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response = requests.get("https://rs-loy-gitlab.concordia.ca/api/v4/projects/2/repository/branches/master",
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headers={"PRIVATE-TOKEN": self.config.hub_token})
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recent_commit = response.json()["commit"]["id"]
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exiting_city = self._get_by_hub_version(recent_commit, city.name)
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# Do not persist the same city for the same version of Hub
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if exiting_city is None:
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db_city.hub_release = recent_commit
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cities = self.get_by_name(city.name)
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# update version for the same city but different hub versions
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if len(cities) == 0:
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db_city.city_version = 0
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else:
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db_city.city_version = cities[-1].city_version + 1
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# Persist city
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self.session.add(db_city)
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self.session.flush()
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self.session.commit()
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return db_city
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else:
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return {'message': f'Same version of {city.name} exist'}
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except SQLAlchemyError as err:
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print(f'Error while adding city: {err}')
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except HTTPError as err:
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print(f'Error retrieving Hub latest release: {err}')
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def get_by_id(self, city_id: int) -> DBCity:
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"""
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Fetch a City based on the id
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:param city_id: the city id
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:return: a city
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"""
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try:
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return self.session.execute(select(DBCity).where(DBCity.id == city_id)).first()[0]
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except SQLAlchemyError as err:
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print(f'Error while fetching city: {err}')
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def _get_by_hub_version(self, hub_commit: str, city_name: str) -> City:
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"""
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Fetch a City based on the name and hub project recent commit
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:param hub_commit: the latest hub commit
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:param city_name: the name of the city
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:return: a city
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"""
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try:
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return self.session.execute(select(DBCity)
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.where(DBCity.hub_release == hub_commit, DBCity.name == city_name)).first()
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except SQLAlchemyError as err:
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print(f'Error while fetching city: {err}')
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def update(self, city_id: int, city: City):
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"""
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Updates a city
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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:
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"""
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try:
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self.session.query(DBCity).filter(DBCity.id == city_id) \
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.update({
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'name': city.name, 'srs_name': city.srs_name, 'country_code': city.country_code, 'longitude': city.longitude,
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'latitude': city.latitude, 'time_zone': city.time_zone, 'lower_corner': city.lower_corner.tolist(),
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'upper_corner': city.upper_corner.tolist(), 'climate_reference_city': city.climate_reference_city,
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})
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self.session.commit()
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except SQLAlchemyError as err:
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print(f'Error while updating city: {err}')
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def get_by_name(self, city_name: str) -> [DBCity]:
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"""
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Fetch city based on the name
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:param city_name: the name of the building
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:return: [ModelCity] with the provided name
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"""
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try:
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result_set = self.session.execute(select(DBCity).where(DBCity.name == city_name))
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return [building[0] for building in result_set]
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except SQLAlchemyError as err:
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print(f'Error while fetching city by name: {err}')
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def delete_city(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: a city
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"""
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try:
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self.session.query(DBCity).filter(DBCity.id == city_id).delete()
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self.session.commit()
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except SQLAlchemyError as err:
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print(f'Error while fetching city: {err}')
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