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main.py
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main.py
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from datetime import date, datetime
from cachetools import Cache
from typing import Optional
from fastapi import FastAPI
from pydantic import BaseModel
# maxsize is the size of data the Cache can hold
cache_data = Cache(maxsize=50000)
class UssdRequest(BaseModel):
sessionID: str
userID: str
newSession: bool
msisdn: str
userData: str | None = None
network: str
class UssdResponse(BaseModel):
sessionID: str | None = None
userID: str | None = None
continueSession: bool | None = None
msisdn: str | None = None
message: str | None = None
class UssdState(BaseModel):
sessionID: str
message: str
newSession: bool
msisdn: str
userData: str | None = None
network: str
message: str
level: int
part: int
app = FastAPI()
@app.get("/")
def read_root():
return {"Hello": "World"}
@app.post("/ussd")
async def handle_ussd(ussd_request: UssdRequest):
response = UssdResponse(
sessionID=ussd_request.sessionID,
userID=ussd_request.userID,
msisdn=ussd_request.msisdn,
)
if ussd_request.newSession:
response.message = (
"Welcome to Arkesel Voting Portal. Please vote for your favourite service from Arkesel"
+ "\n1. SMS"
+ "\n2. Voice"
+ "\n3. Email"
+ "\n4. USSD"
+ "\n5. Payments"
)
response.continueSession = True
# Keep track of the USSD state of the user and their session
current_state = UssdState(
sessionID=ussd_request.sessionID,
msisdn=ussd_request.msisdn,
userData=ussd_request.userData,
network=ussd_request.network,
message=response.message,
level=1,
part=1,
newSession=True,
)
user_response_tracker = cache_data.get(hash(ussd_request.sessionID), [])
user_response_tracker.append(current_state)
cache_data[hash(ussd_request.sessionID)] = user_response_tracker
else:
last_response = cache_data.get(hash(ussd_request.sessionID), [])[-1]
if last_response.level == 1:
user_data = ussd_request.userData
if user_data == "1":
response.message = (
"For SMS which of the features do you like best?"
+ "\n1. From File"
+ "\n2. Quick SMS"
+ "\n\n #. Next Page"
)
response.continueSession = True
# Keep track of the USSD state of the user and their session
current_state = UssdState(
sessionID=ussd_request.sessionID,
msisdn=ussd_request.msisdn,
userData=ussd_request.userData,
network=ussd_request.network,
message=response.message,
level=2,
part=1,
newSession=ussd_request.newSession,
)
user_response_tracker = cache_data.get(hash(ussd_request.sessionID), [])
user_response_tracker.append(current_state)
cache_data[hash(ussd_request.sessionID)] = user_response_tracker
elif (
user_data == "2"
or user_data == "3"
or user_data == "4"
or user_data == "5"
):
response.message = "Thank you for voting!"
response.continueSession = False
else:
response.message = "Bad choice!"
response.continueSession = False
elif last_response.level == 2:
possible_choices = ["1", "2", "3", "4"]
if last_response.part == 1 and ussd_request.userData == "#":
response.message = (
"For SMS which of the features do you like best?"
+ "\n3. Bulk SMS"
+ "\n\n*. Go Back"
+ "\n#. Next Page"
)
response.continueSession = True
current_state = UssdState(
sessionID=ussd_request.sessionID,
msisdn=ussd_request.msisdn,
userData=ussd_request.userData,
network=ussd_request.network,
message=response.message,
level=2,
part=2,
newSession=ussd_request.newSession,
)
user_response_tracker = cache_data.get(hash(ussd_request.sessionID), [])
user_response_tracker.append(current_state)
cache_data[hash(ussd_request.sessionID)] = user_response_tracker
elif last_response.part == 2 and ussd_request.userData == "#":
response.message = (
"For SMS which of the features do you like best?"
+ "\n4. SMS To Contacts"
+ "\n\n*. Go Back"
)
response.continueSession = True
current_state = UssdState(
sessionID=ussd_request.sessionID,
msisdn=ussd_request.msisdn,
userData=ussd_request.userData,
network=ussd_request.network,
message=response.message,
level=2,
part=3,
newSession=ussd_request.newSession,
)
user_response_tracker = cache_data.get(hash(ussd_request.sessionID), [])
user_response_tracker.append(current_state)
cache_data[hash(ussd_request.sessionID)] = user_response_tracker
elif last_response.part == 3 and ussd_request.userData == "*":
response.message = (
"For SMS which of the features do you like best?"
+ "\n3. Bulk SMS"
+ "\n\n*. Go Back"
+ "\n#. Next Page"
)
response.continueSession = True
current_state = UssdState(
sessionID=ussd_request.sessionID,
msisdn=ussd_request.msisdn,
userData=ussd_request.userData,
network=ussd_request.network,
message=response.message,
level=2,
part=2,
newSession=ussd_request.newSession,
)
user_response_tracker = cache_data.get(hash(ussd_request.sessionID), [])
user_response_tracker.append(current_state)
cache_data[hash(ussd_request.sessionID)] = user_response_tracker
elif last_response.part == 2 and ussd_request.userData == "*":
response.message = (
"For SMS which of the features do you like best?"
+ "\n1. From File"
+ "\n2. Quick SMS"
+ "\n\n #. Next Page"
)
response.continueSession = True
# Keep track of the USSD state of the user and their session
current_state = UssdState(
sessionID=ussd_request.sessionID,
msisdn=ussd_request.msisdn,
userData=ussd_request.userData,
network=ussd_request.network,
message=response.message,
level=2,
part=1,
newSession=ussd_request.newSession,
)
user_response_tracker = cache_data.get(hash(ussd_request.sessionID), [])
user_response_tracker.append(current_state)
cache_data[hash(ussd_request.sessionID)] = user_response_tracker
elif ussd_request.userData in possible_choices:
response.message = "Thank you for voting!"
response.continueSession = False
else:
response.message = "Bad choice!"
response.continueSession = False
return response