forked from platypush/platypush
116 lines
4.4 KiB
Python
116 lines
4.4 KiB
Python
import datetime
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import os
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from typing import Optional, Union, List, Dict, Any
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from sqlalchemy import create_engine, Column, Integer, String, DateTime
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from sqlalchemy.orm import sessionmaker, scoped_session
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from sqlalchemy.ext.declarative import declarative_base
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from platypush.backend import Backend
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from platypush.config import Config
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from platypush.context import get_plugin
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from platypush.message.event.covid19 import Covid19UpdateEvent
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from platypush.plugins.covid19 import Covid19Plugin
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Base = declarative_base()
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Session = scoped_session(sessionmaker())
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class Covid19Update(Base):
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""" Models the Covid19Data table """
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__tablename__ = 'covid19data'
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__table_args__ = ({'sqlite_autoincrement': True})
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country = Column(String, primary_key=True)
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confirmed = Column(Integer, nullable=False, default=0)
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deaths = Column(Integer, nullable=False, default=0)
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recovered = Column(Integer, nullable=False, default=0)
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last_updated_at = Column(DateTime, nullable=False, default=datetime.datetime.utcnow)
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class Covid19Backend(Backend):
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"""
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This backend polls new data about the Covid-19 pandemic diffusion and triggers events when new data is available.
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Triggers:
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- :class:`platypush.message.event.covid19.Covid19UpdateEvent` when new data is available.
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"""
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# noinspection PyProtectedMember
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def __init__(self, country: Optional[Union[str, List[str]]], poll_seconds: Optional[float] = 3600.0, **kwargs):
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"""
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:param country: Default country (or list of countries) to retrieve the stats for. It can either be the full
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country name or the country code. Special values:
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- ``world``: Get worldwide stats.
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- ``all``: Get all the available stats.
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Default: either the default configured on the :class:`platypush.plugins.covid19.Covid19Plugin` plugin or
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``world``.
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:param poll_seconds: How often the backend should check for new check-ins (default: one hour).
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"""
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super().__init__(poll_seconds=poll_seconds, **kwargs)
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self._plugin: Covid19Plugin = get_plugin('covid19')
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self.country: List[str] = self._plugin._get_countries(country)
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self.workdir = os.path.join(os.path.expanduser(Config.get('workdir')), 'covid19')
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self.dbfile = os.path.join(self.workdir, 'data.db')
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os.makedirs(self.workdir, exist_ok=True)
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def __enter__(self):
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self.logger.info('Started Covid19 backend')
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def __exit__(self, exc_type, exc_val, exc_tb):
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self.logger.info('Stopped Covid19 backend')
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def _process_update(self, summary: Dict[str, Any], session: Session):
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update_time = datetime.datetime.fromisoformat(summary['Date'].replace('Z', '+00:00'))
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self.bus.post(Covid19UpdateEvent(
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country=summary['Country'],
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country_code=summary['CountryCode'],
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confirmed=summary['TotalConfirmed'],
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deaths=summary['TotalDeaths'],
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recovered=summary['TotalRecovered'],
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update_time=update_time,
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))
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session.merge(Covid19Update(country=summary['CountryCode'],
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confirmed=summary['TotalConfirmed'],
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deaths=summary['TotalDeaths'],
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recovered=summary['TotalRecovered'],
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last_updated_at=update_time))
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def loop(self):
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# noinspection PyUnresolvedReferences
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summaries = self._plugin.summary(self.country).output
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if not summaries:
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return
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engine = create_engine('sqlite:///{}'.format(self.dbfile), connect_args={'check_same_thread': False})
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Base.metadata.create_all(engine)
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Session.configure(bind=engine)
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session = Session()
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last_records = {
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record.country: record
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for record in session.query(Covid19Update).filter(Covid19Update.country.in_(self.country)).all()
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}
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for summary in summaries:
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country = summary['CountryCode']
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last_record = last_records.get(country)
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if not last_record or \
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summary['TotalConfirmed'] != last_record.confirmed or \
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summary['TotalDeaths'] != last_record.deaths or \
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summary['TotalRecovered'] != last_record.recovered:
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self._process_update(summary=summary, session=session)
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session.commit()
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# vim:sw=4:ts=4:et:
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