HLD.md

🚍 Driver Status & Location Tracking – Design Proposal

🧠 Overview

This feature allows the driver’s current location or status (At Hostel, On Route, At Campus) to be tracked and accessed by students via the app. The data is lightweight and does not require a heavy storage solution initially.

We aim for a minimal setup using in-memory variables or file-based storage, with the flexibility to scale later using Redis or MongoDB.

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🎯 Goals

• In-memory storage and update of driver's current location/status
• Allow the frontend (students) to poll the backend and fetch this status
• Keep the system lightweight and modular for now
• Prepare for later integration with Redis (for real-time) or MongoDB

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✅ Basic Implementation (Temporary In-Memory Approach)

We use navigator.geolocation.getCurrentPosition() in the driver app to fetch the driver's GPS coordinates and send them to the backend.

The backend stores the latest location in a real-time in-memory variable:

// In-memory storage
let driverLocation = { lat: null, lng: null };

// Update location via POST /api/driver/location
app.post('/api/driver/location', (req, res) => {
  const { lat, lng } = req.body;
  driverLocation = { lat, lng };
  res.json({ message: 'Location updated' });
});