73 lines
2.8 KiB
Python
73 lines
2.8 KiB
Python
# standard imports
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import json
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from datetime import timedelta
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# third party imports
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import celery
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from celery.utils.log import get_logger
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# local imports
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from cic_ussd.db.models.base import SessionBase
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from cic_ussd.db.models.ussd_session import UssdSession
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from cic_ussd.error import SessionNotFoundError
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from cic_ussd.session.ussd_session import UssdSession as InMemoryUssdSession
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from cic_ussd.tasks.base import CriticalSQLAlchemyTask
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celery_app = celery.current_app
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logg = get_logger(__file__)
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@celery_app.task(base=CriticalSQLAlchemyTask)
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def persist_session_to_db(external_session_id: str):
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"""
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This task initiates the saving of the session object to the database and it's removal from the in-memory storage.
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:param external_session_id: The session id of the session to be saved.
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:type external_session_id: str.
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:return: The representation of the newly created database object or en error message if session is not found.
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:rtype: str.
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:raises SessionNotFoundError: If the session object is not found in memory.
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:raises VersionTooLowError: If the session's version doesn't match the latest version.
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"""
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# create session
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session = SessionBase.create_session()
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# get ussd session in redis cache
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in_memory_session = InMemoryUssdSession.redis_cache.get(external_session_id)
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# process persistence to db
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if in_memory_session:
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in_memory_session = json.loads(in_memory_session)
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in_db_ussd_session = session.query(UssdSession).filter_by(external_session_id=external_session_id).first()
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if in_db_ussd_session:
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in_db_ussd_session.update(
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session=session,
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user_input=in_memory_session.get('user_input'),
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state=in_memory_session.get('state'),
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version=in_memory_session.get('version'),
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)
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else:
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in_db_ussd_session = UssdSession(
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external_session_id=external_session_id,
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service_code=in_memory_session.get('service_code'),
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msisdn=in_memory_session.get('msisdn'),
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user_input=in_memory_session.get('user_input'),
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state=in_memory_session.get('state'),
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version=in_memory_session.get('version'),
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)
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# handle the updating of session data for persistence to db
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session_data = in_memory_session.get('session_data')
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if session_data:
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for key, value in session_data.items():
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in_db_ussd_session.set_data(key=key, value=value, session=session)
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session.add(in_db_ussd_session)
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session.commit()
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session.close()
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InMemoryUssdSession.redis_cache.expire(external_session_id, timedelta(minutes=1))
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else:
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session.close()
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raise SessionNotFoundError('Session does not exist!')
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