Weather App Backend (Go + Fiber)

Backend API for fetching current weather data from WeatherAPI with Redis caching.

Features

• Go Fiber HTTP server
• POST endpoint to fetch current weather by city
• Redis cache (10 minute TTL per city)
• Graceful shutdown (closes Redis client on SIGINT/SIGTERM)

Requirements

• Go (see go.mod for the version)
• A WeatherAPI key (WEATHER_API_KEY)
• Redis (local install or Docker)

Configuration

The server loads environment variables from a .env file if present (optional).

Environment variables

• WEATHER_API_KEY: your WeatherAPI key (required)
• REDIS_URL: Redis connection URL (required)
  • Example (local): redis://localhost:6379/0
  • Example (Docker Compose): redis://redis:6379/0

Running locally

1. Start Redis (example with Docker):

docker run --rm -p 6379:6379 redis:7-alpine

2. Create a .env file:

WEATHER_API_KEY=your_key_here
REDIS_URL=redis://localhost:6379/0

3. Run the server:

go run .

The server listens on http://localhost:3000.

Running with Docker Compose

This repo includes docker-compose.yml and a Dockerfile.

1. Create a .env file (Compose will read it automatically):

WEATHER_API_KEY=your_key_here
REDIS_PASSWORD=

2. Start everything:

docker compose up --build

Note about Redis env var naming

The app code expects REDIS_URL (a URL like redis://redis:6379/0). If your Compose setup isn’t working, ensure the container gets REDIS_URL (the current docker-compose.yml uses REDIS_ADDR, which the app does not read).

API

Health/root

• GET /
• Response: Hello, World!

Current weather (cached)

• POST /weather/current
• Body:

{ "city": "London" }

• Example:

curl -sS -X POST "http://localhost:3000/weather/current" \
  -H "Content-Type: application/json" \
  -d '{"city":"London"}'

CORS

main.go restricts CORS to https://vaayu-weather-app.vercel.app/. For local frontend development, you may need to update AllowOrigins (for example, to include http://localhost:5173).