cic-internal-integration/apps/cic-ussd/cic_ussd/db/models/ussd_session.py

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2021-02-06 16:13:47 +01:00
# standard imports
import logging
# third-party imports
from sqlalchemy import Column, String, Integer
from sqlalchemy.dialects.postgresql import JSON
from sqlalchemy.orm.attributes import flag_modified
# local imports
from cic_ussd.db.models.base import SessionBase
from cic_ussd.error import VersionTooLowError
logg = logging.getLogger(__name__)
class UssdSession(SessionBase):
__tablename__ = 'ussd_session'
external_session_id = Column(String, nullable=False, index=True, unique=True)
service_code = Column(String, nullable=False)
msisdn = Column(String, nullable=False)
user_input = Column(String)
state = Column(String, nullable=False)
session_data = Column(JSON)
version = Column(Integer, nullable=False)
def set_data(self, key, session, value):
if self.session_data is None:
self.session_data = {}
self.session_data[key] = value
# https://stackoverflow.com/questions/42559434/updates-to-json-field-dont-persist-to-db
flag_modified(self, "session_data")
session.add(self)
def get_data(self, key):
if self.session_data is not None:
return self.session_data.get(key)
else:
return None
def check_version(self, new_version):
if new_version <= self.version:
raise VersionTooLowError('New session version number is not greater than last saved version!')
def update(self, user_input, state, version, session):
self.check_version(version)
self.user_input = user_input
self.state = state
self.version = version
session.add(self)
@staticmethod
def have_session_for_phone(phone):
r = UssdSession.session.query(UssdSession).filter_by(msisdn=phone).first()
return r is not None
def to_json(self):
""" This function serializes the in db ussd session object to a JSON object
:return: A JSON object of a ussd session in db
:rtype: dict
"""
return {
"external_session_id": self.external_session_id,
"service_code": self.service_code,
"msisdn": self.msisdn,
"user_input": self.user_input,
"state": self.state,
"session_data": self.session_data,
"version": self.version
}