📧 Email Queue Microservice (Go)

✅ Features

• Accepts email jobs over HTTP (POST /send-email)
• Validates input
• Queues jobs in memory
• Processes jobs with concurrent workers
• Gracefully shuts down on Ctrl+C

🚀 Run

go run main.go

• Run with command flags

  -haddr string
    	Set the HTTP address (default "localhost:8080")
  -queue_size int
    	Queue size (default 10)
  -workers int
    	Number of worker goroutines (default 3)

• Run go run main.go -haddr "localhost:11000" -workers 5 -queue_size 100

Testing

Example Payload

{
  "to": "user@example.com",
  "subject": "Welcome!",
  "body": "Thanks for signing up."
}

Testing with curl

curl -X POST http://localhost:8080/send-email \
-H "Content-Type: application/json" \
-d '{"to":"user@example.com", "subject":"Welcome", "body":"Thanks!"}'

Todo

• Add a Redis Queue
• Add Retry Logic
• Add Prometheus
• Add Testcases

Tree

.
├── go.mod
├── internal
│   ├── email
│   │   └── email.go
│   ├── queue
│   │   ├── memory_queue.go
│   │   └── queue.go
│   ├── server
│   │   └── server.go
│   └── worker
│       └── worker.go
├── main.go
└── readme.md

5 directories, 8 files