473 lines
18 KiB
Python
473 lines
18 KiB
Python
# standard imports
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import json
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import logging
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# third party imports
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import celery
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import i18n
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from cic_eth.api.api_task import Api
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from tinydb.table import Document
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from typing import Optional
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# local imports
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from cic_ussd.db.models.user import User
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from cic_ussd.db.models.ussd_session import UssdSession
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from cic_ussd.db.models.task_tracker import TaskTracker
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from cic_ussd.menu.ussd_menu import UssdMenu
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from cic_ussd.processor import custom_display_text, process_request, retrieve_most_recent_ussd_session
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from cic_ussd.redis import InMemoryStore
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from cic_ussd.session.ussd_session import UssdSession as InMemoryUssdSession
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from cic_ussd.validator import check_known_user, validate_response_type
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logg = logging.getLogger()
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def add_tasks_to_tracker(task_uuid):
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"""
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This function takes tasks spawned over api interfaces and records their creation time for tracking.
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:param task_uuid: The uuid for an initiated task.
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:type task_uuid: str
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"""
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task_record = TaskTracker(task_uuid=task_uuid)
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TaskTracker.session.add(task_record)
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TaskTracker.session.commit()
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def define_response_with_content(headers: list, response: str) -> tuple:
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"""This function encodes responses to byte form in order to make feasible for uwsgi response formats. It then
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computes the length of the response and appends the content length to the headers.
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:param headers: A list of tuples defining headers for responses.
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:type headers: list
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:param response: The response to send for an incoming http request
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:type response: str
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:return: A tuple containing the response bytes and a list of tuples defining headers
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:rtype: tuple
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"""
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response_bytes = response.encode('utf-8')
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content_length = len(response_bytes)
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content_length_header = ('Content-Length', str(content_length))
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# check for content length defaulted to zero in error headers
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for position, header in enumerate(headers):
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if header[0] == 'Content-Length':
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headers[position] = content_length_header
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else:
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headers.append(content_length_header)
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return response_bytes, headers
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def create_ussd_session(
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external_session_id: str,
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phone: str,
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service_code: str,
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user_input: str,
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current_menu: str,
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session_data: Optional[dict] = None) -> InMemoryUssdSession:
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"""
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Creates a new ussd session
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:param external_session_id: Session id value provided by AT
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:type external_session_id: str
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:param phone: A valid phone number
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:type phone: str
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:param service_code: service code passed over request
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:type service_code AT service code
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:param user_input: Input from the request
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:type user_input: str
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:param current_menu: Menu name that is currently being displayed on the ussd session
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:type current_menu: str
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:param session_data: Any additional data that was persisted during the user's interaction with the system.
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:type session_data: dict.
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:return: ussd session object
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:rtype: Session
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"""
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session = InMemoryUssdSession(
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external_session_id=external_session_id,
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msisdn=phone,
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user_input=user_input,
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state=current_menu,
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service_code=service_code,
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session_data=session_data
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)
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return session
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def create_or_update_session(
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external_session_id: str,
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phone: str,
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service_code: str,
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user_input: str,
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current_menu: str,
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session_data: Optional[dict] = None) -> InMemoryUssdSession:
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"""
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Handles the creation or updating of session as necessary.
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:param external_session_id: Session id value provided by AT
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:type external_session_id: str
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:param phone: A valid phone number
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:type phone: str
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:param service_code: service code passed over request
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:type service_code: AT service code
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:param user_input: input from the request
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:type user_input: str
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:param current_menu: Menu name that is currently being displayed on the ussd session
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:type current_menu: str
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:param session_data: Any additional data that was persisted during the user's interaction with the system.
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:type session_data: dict.
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:return: ussd session object
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:rtype: InMemoryUssdSession
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"""
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existing_ussd_session = UssdSession.session.query(UssdSession).filter_by(
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external_session_id=external_session_id).first()
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if existing_ussd_session:
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ussd_session = update_ussd_session(
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ussd_session=existing_ussd_session,
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current_menu=current_menu,
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user_input=user_input,
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session_data=session_data
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)
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else:
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ussd_session = create_ussd_session(
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external_session_id=external_session_id,
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phone=phone,
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service_code=service_code,
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user_input=user_input,
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current_menu=current_menu,
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session_data=session_data
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)
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return ussd_session
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def get_account_status(phone_number) -> str:
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"""Get the status of a user's account.
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:param phone_number: The phone number to be checked.
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:type phone_number: str
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:return: The user account status.
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:rtype: str
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"""
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user = User.session.query(User).filter_by(phone_number=phone_number).first()
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status = user.get_account_status()
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User.session.add(user)
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User.session.commit()
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return status
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def get_latest_input(user_input: str) -> str:
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"""This function gets the last value entered by the user from the collective user input which follows the pattern of
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asterix (*) separated entries.
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:param user_input: The data entered by a user.
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:type user_input: str
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:return: The last element in the user input value.
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:rtype: str
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"""
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return user_input.split('*')[-1]
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def initiate_account_creation_request(chain_str: str,
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external_session_id: str,
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phone_number: str,
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service_code: str,
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user_input: str) -> str:
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"""This function issues a task to create a blockchain account on cic-eth. It then creates a record of the ussd
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session corresponding to the creation of the account and returns a response denoting that the user's account is
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being created.
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:param chain_str: The chain name and network id.
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:type chain_str: str
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:param external_session_id: A unique ID from africastalking.
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:type external_session_id: str
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:param phone_number: The phone number for the account to be created.
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:type phone_number: str
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:param service_code: The service code dialed.
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:type service_code: str
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:param user_input: The input entered by the user.
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:type user_input: str
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:return: A response denoting that the account is being created.
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:rtype: str
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"""
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# attempt to create a user
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cic_eth_api = Api(callback_task='cic_ussd.tasks.callback_handler.process_account_creation_callback',
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callback_queue='cic-ussd',
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callback_param='',
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chain_str=chain_str)
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creation_task_id = cic_eth_api.create_account().id
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# record task initiation time
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add_tasks_to_tracker(task_uuid=creation_task_id)
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# cache account creation data
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cache_account_creation_task_id(phone_number=phone_number, task_id=creation_task_id)
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# find menu to notify user account is being created
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current_menu = UssdMenu.find_by_name(name='account_creation_prompt')
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# create a ussd session session
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create_or_update_session(
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external_session_id=external_session_id,
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phone=phone_number,
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service_code=service_code,
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current_menu=current_menu.get('name'),
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user_input=user_input)
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# define response to relay to user
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response = define_multilingual_responses(
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key='ussd.kenya.account_creation_prompt', locales=['en', 'sw'], prefix='END')
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return response
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def define_multilingual_responses(key: str, locales: list, prefix: str, **kwargs):
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"""This function returns responses in multiple languages in the interest of enabling responses in more than one
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language.
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:param key: The key to access some text value from the translation files.
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:type key: str
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:param locales: A list of the locales to translate the text value to.
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:type locales: list
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:param prefix: The prefix for the text value either: (CON|END)
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:type prefix: str
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:param kwargs: Other arguments to be passed to the translator
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:type kwargs: kwargs
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:return: A string of the text value in multiple languages.
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:rtype: str
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"""
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prefix = prefix.upper()
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response = f'{prefix} '
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for locale in locales:
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response += i18n.t(key=key, locale=locale, **kwargs)
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response += '\n'
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return response
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def persist_session_to_db_task(external_session_id: str, queue: str):
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"""
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This function creates a signature matching the persist session to db task and runs the task asynchronously.
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:param external_session_id: Session id value provided by AT
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:type external_session_id: str
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:param queue: Celery queue on which task should run
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:type queue: str
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"""
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s_persist_session_to_db = celery.signature(
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'cic_ussd.tasks.ussd_session.persist_session_to_db',
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[external_session_id]
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)
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s_persist_session_to_db.apply_async(queue=queue)
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def cache_account_creation_task_id(phone_number: str, task_id: str):
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"""This function stores the task id that is returned from a task spawned to create a blockchain account in the redis
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cache.
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:param phone_number: The phone number for the user whose account is being created.
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:type phone_number: str
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:param task_id: A celery task id
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:type task_id: str
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"""
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redis_cache = InMemoryStore.cache
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account_creation_request_data = {
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'phone_number': phone_number,
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'sms_notification_sent': False,
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'status': 'PENDING',
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'task_id': task_id,
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}
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redis_cache.set(task_id, json.dumps(account_creation_request_data))
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redis_cache.persist(name=task_id)
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def process_current_menu(ussd_session: Optional[dict], user: User, user_input: str) -> Document:
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"""This function checks user input and returns a corresponding ussd menu
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:param ussd_session: An in db ussd session object.
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:type ussd_session: UssdSession
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:param user: A user object.
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:type user: User
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:param user_input: The user's input.
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:type user_input: str
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:return: An in memory ussd menu object.
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:rtype: Document
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"""
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# handle invalid inputs
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if ussd_session and user_input == "":
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current_menu = UssdMenu.find_by_name(name='exit_invalid_input')
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else:
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# get current state
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latest_input = get_latest_input(user_input=user_input)
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current_menu = process_request(ussd_session=ussd_session, user_input=latest_input, user=user)
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return current_menu
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def process_menu_interaction_requests(chain_str: str,
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external_session_id: str,
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phone_number: str,
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queue: str,
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service_code: str,
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user_input: str) -> str:
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"""This function handles requests intended for interaction with ussd menu, it checks whether a user matching the
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provided phone number exists and in the absence of which it creates an account for the user.
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In the event that a user exists it processes the request and returns an appropriate response.
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:param chain_str: The chain name and network id.
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:type chain_str: str
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:param external_session_id: Unique session id from AfricasTalking
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:type external_session_id: str
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:param phone_number: Phone number of the user making the request.
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:type phone_number: str
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:param queue: The celery queue on which to run tasks
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:type queue: str
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:param service_code: The service dialed by the user making the request.
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:type service_code: str
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:param user_input: The inputs entered by the user.
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:type user_input: str
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:return: A response based on the request received.
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:rtype: str
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"""
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# check whether the user exists
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if not check_known_user(phone=phone_number):
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response = initiate_account_creation_request(chain_str=chain_str,
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external_session_id=external_session_id,
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phone_number=phone_number,
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service_code=service_code,
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user_input=user_input)
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else:
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# get user
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user = User.session.query(User).filter_by(phone_number=phone_number).first()
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# find any existing ussd session
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existing_ussd_session = UssdSession.session.query(UssdSession).filter_by(
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external_session_id=external_session_id).first()
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# validate user inputs
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if existing_ussd_session:
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current_menu = process_current_menu(
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ussd_session=existing_ussd_session.to_json(),
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user=user,
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user_input=user_input
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)
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else:
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current_menu = process_current_menu(
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ussd_session=None,
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user=user,
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user_input=user_input
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)
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last_ussd_session = retrieve_most_recent_ussd_session(phone_number=user.phone_number)
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if last_ussd_session:
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# create or update the ussd session as appropriate
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ussd_session = create_or_update_session(
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external_session_id=external_session_id,
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phone=phone_number,
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service_code=service_code,
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user_input=user_input,
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current_menu=current_menu.get('name'),
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session_data=last_ussd_session.session_data
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)
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else:
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ussd_session = create_or_update_session(
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external_session_id=external_session_id,
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phone=phone_number,
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service_code=service_code,
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user_input=user_input,
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current_menu=current_menu.get('name')
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)
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# define appropriate response
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response = custom_display_text(
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display_key=current_menu.get('display_key'),
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menu_name=current_menu.get('name'),
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ussd_session=ussd_session.to_json(),
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user=user
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)
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# check that the response from the processor is valid
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if not validate_response_type(processor_response=response):
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raise Exception(f'Invalid response: {response}')
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# persist session to db
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persist_session_to_db_task(external_session_id=external_session_id, queue=queue)
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return response
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def reset_pin(phone_number: str) -> str:
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"""Reset account status from Locked to Pending.
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:param phone_number: The phone number belonging to the account to be unlocked.
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:type phone_number: str
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:return: The status of the pin reset.
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:rtype: str
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"""
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user = User.session.query(User).filter_by(phone_number=phone_number).first()
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user.reset_account_pin()
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User.session.add(user)
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User.session.commit()
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response = f'Pin reset for user {phone_number} is successful!'
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return response
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def update_ussd_session(
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ussd_session: InMemoryUssdSession,
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user_input: str,
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current_menu: str,
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session_data: Optional[dict] = None) -> InMemoryUssdSession:
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"""
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Updates a ussd session
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:param ussd_session: Session id value provided by AT
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:type ussd_session: InMemoryUssdSession
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:param user_input: Input from the request
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:type user_input: str
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:param current_menu: Menu name that is currently being displayed on the ussd session
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:type current_menu: str
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:param session_data: Any additional data that was persisted during the user's interaction with the system.
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:type session_data: dict.
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:return: ussd session object
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:rtype: InMemoryUssdSession
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"""
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if session_data is None:
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session_data = ussd_session.session_data
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session = InMemoryUssdSession(
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external_session_id=ussd_session.external_session_id,
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msisdn=ussd_session.msisdn,
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user_input=user_input,
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state=current_menu,
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service_code=ussd_session.service_code,
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session_data=session_data
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)
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return session
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def save_to_in_memory_ussd_session_data(queue: str, session_data: dict, ussd_session: dict):
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"""This function is used to save information to the session data attribute of a ussd session object in the redis
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cache.
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:param queue: The queue on which the celery task should run.
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:type queue: str
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:param session_data: A dictionary containing data for a specific ussd session in redis that needs to be saved
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temporarily.
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:type session_data: dict
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:param ussd_session: A ussd session passed to the state machine.
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:type ussd_session: UssdSession
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"""
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# define redis cache entry point
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cache = InMemoryStore.cache
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# get external session id
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external_session_id = ussd_session.get('external_session_id')
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# check for existing session data
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existing_session_data = ussd_session.get('session_data')
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# merge old session data with new inputs to session data
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if existing_session_data:
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session_data = {**existing_session_data, **session_data}
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# get corresponding session record
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in_redis_ussd_session = cache.get(external_session_id)
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in_redis_ussd_session = json.loads(in_redis_ussd_session)
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# create new in memory ussd session with current ussd session data
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create_or_update_session(
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external_session_id=external_session_id,
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phone=in_redis_ussd_session.get('msisdn'),
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service_code=in_redis_ussd_session.get('service_code'),
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user_input=in_redis_ussd_session.get('user_input'),
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current_menu=in_redis_ussd_session.get('state'),
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session_data=session_data
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)
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persist_session_to_db_task(external_session_id=external_session_id, queue=queue)
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