URL Shortening Service using Go

Ever wondered how services like Bitly create concise, shareable links from lengthy URLs? This tutorial guides you through building a URL shortener using Go, Redis, and Docker. It's a great project for developers to enhance their skills in practical web development.

Key Learning Outcomes

This tutorial covers:

• Go project setup with modules.
• RESTful API development in Go.
• Leveraging Redis for efficient key-value storage.
• Structuring Go code for maintainability and scalability.

Prerequisites

Ensure you have the following installed:

• Docker
• Docker Desktop (Install it on your system)

Step-by-Step Implementation

1. Project Initialization

Create a project directory and initialize a Go module:

mkdir url-shortener
cd url-shortener
go mod init github.com/<username>/url-shortener

This generates a go.mod file for dependency management. Replace <username></username> with your GitHub username.

2. Project Structure

Organize your project files for clarity:

<code>url-shortener/
├── handlers/         # API request handlers
│   └── handlers.go
├── models/           # Data structures
│   └── url.go
├── router/           # Routing configuration
│   └── router.go
├── storage/          # Redis interaction logic
│   └── redis-store.go
├── main.go           # Application entry point
├── Dockerfile        # Docker build instructions
├── docker-compose.yml # Docker Compose configuration
└── go.mod            # Go module file</code>

3. Dependency Installation

Install necessary Go packages:

go get github.com/go-redis/redis/v8
go get github.com/gorilla/mux

These provide Redis interaction and routing capabilities.

4. Data Model Definition

In models/url.go, define data structures for requests and responses:

package models

type ShortenRequest struct {
 URL string `json:"url"`
}

type ShortenResponse struct {
 ShortURL string `json:"short_url"`
}

5. Redis Storage Configuration

Implement Redis operations in storage/redis-store.go:

// ... (RedisStore struct and methods as in original example) ...

This code handles saving and retrieving URLs using Redis. The FNV-1a hash function ensures efficient short URL generation.

6. API Handler Implementation

Create the API logic in handlers/handlers.go:

// ... (ShortenURL, RedirectURL, GetTopDomains functions as in original example) ...

These handlers manage URL shortening, redirection, and top domain retrieval.

7. Route Setup

Define API routes in router/router.go:

// ... (SetupRouter function as in original example) ...

This configures the routes for shortening, redirection, and retrieving top domains.

8. Application Entry Point

In main.go, start the HTTP server:

// ... (main function as in original example) ...

This initializes the router and starts the server, logging all registered routes.

9. Dockerfile Creation

Create a Dockerfile to containerize the application:

// ... (Dockerfile content as in original example) ...

10. docker-compose.yml Configuration

Use docker-compose.yml to manage the app and Redis:

// ... (docker-compose.yml content as in original example) ...

11. Application Execution

Build and run the application:

docker-compose up --build

This builds the Docker images and starts the containers.

12. API Endpoint Testing

Test the API endpoints using tools like Postman or curl (examples provided in the original response).

Conclusion

You've successfully built a URL shortening service! This project demonstrates practical Go, Redis, and Docker skills.

Future Enhancements

Consider these extensions:

• Customizable Short URLs: Allow users to define their short links.
• Analytics Dashboard: Track URL usage statistics.
• URL Expiration: Implement short URL expiry.

The complete code is available [link to repository]. Remember to replace placeholders like <username></username> with your actual values.

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