cic-stack/apps/cic-ussd/cic_ussd/processor/ussd.py

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2021-08-06 18:29:01 +02:00
# standard imports
from typing import Optional
# external imports
import celery
import i18n
from sqlalchemy.orm.session import Session
from tinydb.table import Document
# local imports
from cic_ussd.db.models.account import Account, create
from cic_ussd.db.models.base import SessionBase
from cic_ussd.db.models.ussd_session import UssdSession
from cic_ussd.menu.ussd_menu import UssdMenu
from cic_ussd.processor.menu import response
from cic_ussd.processor.util import latest_input, resume_last_ussd_session
from cic_ussd.session.ussd_session import create_or_update_session, persist_ussd_session
from cic_ussd.state_machine import UssdStateMachine
from cic_ussd.translation import translation_for
from cic_ussd.validator import is_valid_response
def handle_menu(account: Account, session: Session) -> Document:
"""
:param account:
:type account:
:param session:
:type session:
:return:
:rtype:
"""
if account.pin_is_blocked(session):
return UssdMenu.find_by_name('exit_pin_blocked')
if account.has_valid_pin(session):
last_ussd_session = UssdSession.last_ussd_session(account.phone_number, session)
if last_ussd_session:
return resume_last_ussd_session(last_ussd_session.state)
elif not account.has_preferred_language():
return UssdMenu.find_by_name('initial_language_selection')
else:
return UssdMenu.find_by_name('initial_pin_entry')
def get_menu(account: Account,
session: Session,
user_input: str,
ussd_session: Optional[dict]) -> Document:
"""
:param account:
:type account:
:param session:
:type session:
:param user_input:
:type user_input:
:param ussd_session:
:type ussd_session:
:return:
:rtype:
"""
user_input = latest_input(user_input)
if not ussd_session:
return handle_menu(account, session)
if user_input == '':
return UssdMenu.find_by_name(name='exit_invalid_input')
if user_input == '0':
return UssdMenu.parent_menu(ussd_session.get('state'))
session = SessionBase.bind_session(session)
state = next_state(account, session, user_input, ussd_session)
return UssdMenu.find_by_name(state)
def handle_menu_operations(chain_str: str,
external_session_id: str,
phone_number: str,
queue: str,
service_code: str,
session,
user_input: str):
"""
:param chain_str:
:type chain_str:
:param external_session_id:
:type external_session_id:
:param phone_number:
:type phone_number:
:param queue:
:type queue:
:param service_code:
:type service_code:
:param session:
:type session:
:param user_input:
:type user_input:
:return:
:rtype:
"""
session = SessionBase.bind_session(session=session)
account: Account = Account.get_by_phone_number(phone_number, session)
if account:
return handle_account_menu_operations(account, external_session_id, queue, session, service_code, user_input)
create(chain_str, phone_number, session)
menu = UssdMenu.find_by_name('account_creation_prompt')
preferred_language = i18n.config.get('fallback')
create_or_update_session(
external_session_id=external_session_id,
msisdn=phone_number,
service_code=service_code,
state=menu.get('name'),
session=session,
user_input=user_input)
persist_ussd_session(external_session_id, queue)
return translation_for('ussd.kenya.account_creation_prompt', preferred_language)
def handle_account_menu_operations(account: Account,
external_session_id: str,
queue: str,
session: Session,
service_code: str,
user_input: str):
"""
:param account:
:type account:
:param external_session_id:
:type external_session_id:
:param queue:
:type queue:
:param session:
:type session:
:param service_code:
:type service_code:
:param user_input:
:type user_input:
:return:
:rtype:
"""
phone_number = account.phone_number
s_query_person_metadata = celery.signature(
'cic_ussd.tasks.metadata.query_person_metadata', [account.blockchain_address], queue='cic-ussd')
s_query_person_metadata.apply_async()
s_query_preferences_metadata = celery.signature(
'cic_ussd.tasks.metadata.query_preferences_metadata', [account.blockchain_address], queue='cic-ussd')
s_query_preferences_metadata.apply_async()
existing_ussd_session = session.query(UssdSession).filter_by(external_session_id=external_session_id).first()
last_ussd_session = UssdSession.last_ussd_session(phone_number, session)
if existing_ussd_session:
menu = get_menu(account, session, user_input, existing_ussd_session.to_json())
else:
menu = get_menu(account, session, user_input, None)
if last_ussd_session:
ussd_session = create_or_update_session(
external_session_id, phone_number, service_code, user_input, menu.get('name'), session,
last_ussd_session.data
)
else:
ussd_session = create_or_update_session(
external_session_id, phone_number, service_code, user_input, menu.get('name'), session, None
)
menu_response = response(
account, menu.get('display_key'), menu.get('name'), session, ussd_session.to_json()
)
if not is_valid_response(menu_response):
raise ValueError(f'Invalid response: {response}')
persist_ussd_session(external_session_id, queue)
return menu_response
def next_state(account: Account, session, user_input: str, ussd_session: dict) -> str:
"""
:param account:
:type account:
:param session:
:type session:
:param user_input:
:type user_input:
:param ussd_session:
:type ussd_session:
:return:
:rtype:
"""
state_machine = UssdStateMachine(ussd_session=ussd_session)
state_machine.scan_data((user_input, ussd_session, account, session))
return state_machine.state