diff --git a/New project b/New project new file mode 100644 index 0000000..840326c --- /dev/null +++ b/New project @@ -0,0 +1,180 @@ +\documentclass[11pt, a4paper]{article} + +% --- UNIVERSAL PREAMBLE BLOCK --- +\usepackage[a4paper, top=2.5cm, bottom=2.5cm, left=2cm, right=2cm]{geometry} +\usepackage{fontspec} + +% Using English as the main language for a technical specification +\usepackage[english, bidi=basic, provide=*]{babel} +\babelprovide[import, onchar=ids fonts]{english} + +% Set default/Latin font to Sans Serif +\babelfont{rm}{Noto Sans} + +\usepackage{amsmath} % For math environments +\usepackage{booktabs} % For nice tables +\usepackage{hyperref} % Always the last package +\usepackage{alltt} % Similar to verbatim, but allows commands inside if needed, though we will keep it simple. + +\title{SwiftGrocer: Hyper-Scalable Quick Commerce Platform} +\author{Technical Specification Document} +\date{\today} + +\begin{document} + +\maketitle + +\begin{abstract} +This document outlines the architecture and key technical components of \textbf{SwiftGrocer}, a third-generation Quick Commerce (QC) platform designed to be more powerful than existing solutions like Blinkit or Instamart. The core competitive advantage lies in a resilient Microservices architecture, real-time data streaming, and advanced Machine Learning models for predictive logistics and inventory management. +\end{abstract} + +\section{Core Architecture Overview} + +SwiftGrocer employs a decoupled, event-driven Microservices architecture to ensure high availability and horizontal scalability. + +\subsection{Technology Stack} +\begin{itemize} + \item \textbf{Frontend (Mobile):} React Native (single codebase for iOS/Android). + \item \textbf{Gateway:} GraphQL API Gateway (Apollo Server) for efficient data fetching. + \item \textbf{Backend (Microservices):} Python (Django/FastAPI) and Node.js (Express) based on service requirements. + \item \textbf{Database:} PostgreSQL (Transactional Data), Redis (Caching, Sessions, Real-time Leaderboards), and Elasticsearch (Product Search). + \item \textbf{Real-time \& Messaging:} Apache Kafka (Event Streaming) and WebSockets (Live order tracking, Chat). + \item \textbf{Deployment:} Kubernetes (K8s) for container orchestration, hosted on a major cloud provider. +\end{itemize} + +\subsection{Key Microservices} +\begin{enumerate} + \item \textbf{Catalog Service:} Handles product listings, inventory links, and static content. + \item \textbf{Inventory Prediction Service (ML):} Uses historical data and external factors (weather, events) to predict hyper-local stock needs. + \item \textbf{Order Processing Service:} Manages order creation, payment integration, and status updates. + \item \textbf{Logistics \& Routing Service:} The brain of the operation, handling dynamic rider assignment, route optimization, and geofencing. + \item \textbf{User Service:} Authentication (OAuth2), profiles, and personalized recommendations. +\end{enumerate} + +\section{The "More Powerful" Code Components} + +The platform's superiority is defined by its predictive and real-time capabilities. Below are conceptual code representations of the critical features. + +\subsection{Predictive Inventory Forecasting (Python Mockup)} + +This service uses a time-series model (like ARIMA or Prophet) to forecast demand for SKUs (Stock Keeping Units) at each dark store location. + +\begin{alltt} +# Predictive Inventory Service (Python/FastAPI) + +from datetime import datetime, timedelta +import pandas as pd +from sklearn.ensemble import RandomForestRegressor + +def train_forecasting_model(store_id: str, historical_sales: pd.DataFrame): + """ + Trains an ML model to predict future demand for a specific dark store. + Features: day_of_week, is_holiday, avg_temp, previous_day_sales. + """ + historical_sales['day_of_week'] = historical_sales['date'].dt.dayofweek + # ... more feature engineering ... + + model = RandomForestRegressor(n_estimators=100, random_state=42) + X = historical_sales[['day_of_week', 'avg_temp', 'previous_day_sales']] + y = historical_sales['units_sold'] + + model.fit(X, y) + return model + +def predict_stock_needs(model, next_day_features: dict) -> int: + """Predicts units needed for the next day based on features.""" + # In a real system, this would output predictions for all SKUs + # for the entire forecast window (e.g., next 7 days). + prediction = model.predict([list(next_day_features.values())]) + return max(0, int(prediction[0] * 1.1)) # Add 10\% buffer +\end{alltt} + +\subsection{Real-time Rider Assignment and Routing (Node.js/JavaScript Mockup)} + +The Logistics Service must calculate rider proximity and estimated travel time in real-time, often using the Haversine formula for initial distance estimates before a more complex route-finding API call. + +\begin{alltt} +// Logistics \& Routing Service (Node.js/TypeScript) + +/** + * Calculates the distance between two Geo-Coordinates using the Haversine formula. + * Used for initial rider proximity screening. + * @param \{lat1, lon1\} - Rider location + * @param \{lat2, lon2\} - Dark Store location + * @returns Distance in kilometers (float) + */ +function haversineDistance(lat1, lon1, lat2, lon2) { + const R = 6371; // Earth radius in km + const dLat = (lat2 - lat1) * (Math.PI / 180); + const dLon = (lon2 - lon1) * (Math.PI / 180); + const a = + Math.sin(dLat / 2) * Math.sin(dLat / 2) + + Math.cos(lat1 * (Math.PI / 180)) * Math.cos(lat2 * (Math.PI / 180)) * + Math.sin(dLon / 2) * Math.sin(dLon / 2); + const c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a)); + return R * c; +} + +/** + * Assigns the best rider based on real-time location and current load. + */ +async function findOptimalRider(order_id, store_location) { + const availableRiders = await getRidersByStatus('AVAILABLE'); + let bestRider = null; + let minScore = Infinity; + + for (const rider of availableRiders) { + const distance = haversineDistance( + rider.geo.lat, rider.geo.lon, + store_location.lat, store_location.lon + ); + // Scoring: prioritizes low distance and low current load + const score = distance * 0.7 + rider.current_load * 0.3; + + if (score < minScore) { + minScore = score; + bestRider = rider; + } + } + + if (bestRider) { + // Log event to Kafka: RIDER_ASSIGNED + await publishEvent('RIDER_ASSIGNED', { order_id, rider_id: bestRider.id }); + return bestRider; + } + throw new Error('No optimal rider found.'); +} +\end{alltt} + +\subsection{Real-time Order Data Model (PostgreSQL)} + +A simplified representation of the core tables required for high-speed quick commerce order tracking. + +\begin{alltt} +-- SQL DDL (PostgreSQL Schema) + +CREATE TABLE dark_stores ( + store_id UUID PRIMARY KEY, + name VARCHAR(255) NOT NULL, + latitude DECIMAL(10, 7) NOT NULL, + longitude DECIMAL(10, 7) NOT NULL, + is_operational BOOLEAN DEFAULT TRUE, + inventory_version INT DEFAULT 1 -- Updated when inventory changes +); + +CREATE TABLE orders ( + order_id UUID PRIMARY KEY, + user_id UUID NOT NULL, + store_id UUID REFERENCES dark_stores(store_id), + total_amount DECIMAL(10, 2) NOT NULL, + status VARCHAR(50) NOT NULL, -- e.g., PENDING, PREPARING, PICKED_UP, DELIVERED + rider_id UUID, + created_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP, + expected_delivery_time TIMESTAMP WITH TIME ZONE +); +\end{alltt} + +\section{Conclusion} + +SwiftGrocer's advantage is built on a modular, data-driven foundation. The use of microservices allows for specialized development (e.g., Python for ML-heavy services, Node.js for high I/O real-time services) and enables true hyper-scaling capability far beyond a monolithic application structure. +\end{document}