over time, done
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# left empty so the user has to import all submodules explicitly,
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# this ensures clear namespace separation
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from flask_restful import Resource
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from flask import session, Response, request
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import uuid
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from src.services import BasketService
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class Basket(Resource):
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basket_service = BasketService()
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def get_session_id():
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# first interaction with server sets session_id
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# would need to research if this is ideal
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return str(uuid.uuid4())
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def get(self):
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if "session_id" not in session:
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session["session_id"] = self.get_session_id()
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return Response(
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{"total": self.basket_service.total()}, mimetype="application/json"
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)
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def post(self):
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# expects something similar: {"items": [{"item_id": abc002}]}
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if "session_id" not in session:
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session["session_id"] = self.get_session_id()
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jsonData = request.get_json(force=True)
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for entry in jsonData["items"]:
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self.basket_service.scan(entry["item_id"])
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return Response(HTTPStatus=201)
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from flask import Flask, request, g, render_template, redirect
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from flask_restful import Resource, reqparse
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from flask_restful_swagger_3 import Api
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from json import dumps
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import logging
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import endpoints.BasketEndpoint as BasketEndpoint
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app = Flask(__name__)
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app.secret_key = "SUPER_DUPER_BAD_SECRET_KEY"
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api = Api(app)
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logging.basicConfig(level=logging.DEBUG)
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api.add_resource(BasketEndpoint.Basket, "/api/v1/basket/")
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@app.route("/")
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def index():
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"""in lieu of a UI redirect to the API doc"""
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app.logger.info(f"request from {request.remote_addr}")
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return redirect("/api/doc/swagger.json", code=302)
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from dataclasses import dataclass
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@dataclass
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class Item:
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id: str
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price: str
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from main import app
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# disabled threading for easier session handleing in this demo project
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# if threaded was True, as session store would be needed
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app.run(host="0.0.0.0", port="80", debug=False, threaded=False)
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from collections import defaultdict
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from DealsService import DealsService
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from ProductService import ProductService
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class BasketService:
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baskets = None
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dealsService = None
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productService = None
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def __init__(self) -> None:
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self.baskets = defaultdict()
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self.dealsService = DealsService()
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self.productService = ProductService()
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def total(self, sessionID: str) -> int:
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items = self.baskets[sessionID]
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prices = self.dealsService.get_items_with_final_prices(items)
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return sum(prices)
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def scan(self, session_id: str, itemId) -> None:
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item = self.productService.get_item_from_id(itemId)
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self.baskets[session_id].append(item)
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from collections import defaultdict
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import math
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class DealsService:
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# deals and promotions are global and therefor class vars instead of instance vars
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deals = dict()
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promotions = defaultdict(list)
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def __init__(self) -> None:
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# placeholder data
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# promiootion can be read dznamically from db
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self.promotions["A0001"].append("two_for_one")
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self.promotions["A0002"].append("ten_percent_off")
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# deal behavior needs to be programmed an can only be
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# changed with the rollout of a new version,
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self.deals["two_for_one"] = DealsService.two_for_one_deal
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def get_items_with_final_prices(self, items) -> list:
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groups = defaultdict(list)
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for obj in items:
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groups[obj.id].append(obj)
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for group in groups.values():
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# the deals do not stack, the first deal in the list of deals is taken,
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# ideally for the customer all deals would be calculated and the maximum value selected
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# not implemented for time reasons
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for promotion in self.promotions.get(group[0].id):
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# iterate over all promotions for this item
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# lookup the higher order function that is associated with this deal name
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# apply the function to the item group
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# if the deal was applied to the group of items break and move on to the next item group
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# this avoids discout stacking
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if self.deals[promotion](group):
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break
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return [item for group in groups.values() for item in group]
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@staticmethod
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def two_for_one_deal(group):
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"""' applies deal onto item group in place"""
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# ideally would be an object implementing a "Deal"-interface,
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# which has 2 functions, deal_is_applicable() and apply_deal()
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def _round_up(self, val: float):
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return math.ceil(val * 100) / 100
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# could be compressed
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# not done since this would be the 2 different functions in the above mentioned interface
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deal_is_applicable = False
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if len(group) >= 2:
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deal_is_applicable = True
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for i in range(len(group) // 2):
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group[i].price = _round_up(group[i].price / 2)
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return deal_is_applicable
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@staticmethod
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def ten_percent_off(group):
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# the percentage discount could be added to function signature
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"""' applies deal onto item group in place"""
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# ideally would be an object implementing a "Deal"-interface,
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# which has 2 functions, deal_is_applicable() and apply_deal()
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def _round_up(self, val: float):
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return math.ceil(val * 100) / 100
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deal_is_applicable = True
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for i in range(len(group)):
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group[i].price = _round_up(group[i].price * 0.9)
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return deal_is_applicable
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from src.models import Item
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class ProductService:
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# prices are global, sheduled function to refresh prices periodically
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# could save ressources under high load
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prices = dict()
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def __init__(self) -> None:
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# placeholder data
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self.prices["A0001"] = 12.99
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self.prices["A0002"] = 3.99
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def get_item_from_id(self, item_id: str) -> Item:
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return Item(id=item_id, price=self.prices.get(item_id))
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