Insider Message Sending System

A simple automatic message sending system built with Go.

Architecture Note

This implementation is kept in a single file for simplicity and easy demonstration. In a production environment, I would structure it with:

• Separate packages (handlers, services, models)
• Database layer (PostgreSQL/MySQL)
• Redis caching for messageId storage
• Proper logging and error handling
• Configuration management
• Unit tests

I also put the environment variables to the .env file for you to test the service without having to set the environment variables manually. I removed the auth key for security reasons and put a placeholder.

Installation & Run

# Clone and run
git clone https://github.com/yusuf-eren/lets-go-case
cd lets-go-case
go mod tidy
go run main.go

Configuration

Set environment variables:

export WEBHOOK_URL="https://webhook.site/02d3e3cd-8388-43e8-8687-586291bb6127"
export INS_AUTH_KEY="auth-key"
export BATCH_SIZE=2
export SEND_INTERVAL_MIN=2
export MESSAGE_CHAR_LIMIT=500
export PORT=8080

API Endpoints

• GET /start - Start message sending
• GET /stop - Stop message sending
• GET /sent - Get all messages with status

Behavior

• Sends all unsent messages immediately on startup
• Then sends 2 messages every 2 minutes
• Messages are marked as sent to prevent duplicates