LazySock

LazySock is a lightweight Rust library for building Unix Domain Socket services with minimal boilerplate. It provides a simple macro to create .sock files (defaulting to /tmp, no root privileges required, with automatic cleanup on system reboot). Initialize a socket path, register routes, bind handlers, and you're ready to send curl requests for JSON responses.

Features

Zero Boilerplate: Use the lazy_sock! macro to quickly set up a Unix Domain Socket server.
Simple Routing: Register routes for HTTP-like methods (GET, POST, PUT, DELETE) with ease.
Flexible Responses: Support for JSON, HTML, plain text, and binary responses.
Asynchronous: Built on top of Tokio for high-performance async I/O.
Lightweight: Minimal dependencies and straightforward API.
Customizable: Configure logging and cleanup behavior as needed.

Installation

Add LazySock to your project by including it in your Cargo.toml:

[dependencies]
lazy-sock = "1"

Ensure you have the following dependencies in your Cargo.toml as well:

tokio = { version = "1", features = ["full"] }
url = "2"

Usage

Basic Example

The following example demonstrates how to create a simple Unix Domain Socket server with multiple routes:

use lazy_sock::{Method, Response, lazy_sock};

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    let server = lazy_sock!("/tmp/lazy-sock-demo.sock");

    // Route for GET /
    server
        .route(Method::Get, "/", |_req| {
            Response::json(r#"{"message": "Hello, World!", "status": "success"}"#)
        })
        .await;

    // Route for GET /health
    server
        .route(Method::Get, "/health", |_req| {
            Response::json(r#"{"status": "healthy"}"#)
        })
        .await;

    // Route for POST /echo
    server
        .route(Method::Post, "/echo", |req| match req.body_string() {
            Ok(body) if !body.is_empty() => Response::json(&format!(r#"{{"echo": "{}"}}"#, body)),
            Ok(_) => Response::new(400).with_text("Request body is empty"),
            Err(_) => Response::new(400).with_text("Invalid UTF-8 in request body"),
        })
        .await;

    // Route for GET /html
    server
        .route(Method::Get, "/html", |_req| {
            Response::html(
                r#"
            <!DOCTYPE html>
            <html>
            <head><title>Lazy Sock Demo</title></head>
            <body><h1>Hello from Lazy Sock!</h1></body>
            </html>
        "#,
            )
        })
        .await;

    println!("Lazy Sock Demo Server Starting...");
    println!("Socket: /tmp/lazy-sock-demo.sock");
    println!("Try these commands:");
    println!("   curl --unix-socket /tmp/lazy-sock-demo.sock http://localhost/");
    println!("   curl --unix-socket /tmp/lazy-sock-demo.sock http://localhost/health");
    println!("   curl --unix-socket /tmp/lazy-sock-demo.sock http://localhost/html");
    println!(
        "   curl --unix-socket /tmp/lazy-sock-demo.sock -X POST http://localhost/echo -d 'Hello from curl!'"
    );
    println!("Press Ctrl+C to stop");
    println!();

    // Run the server
    server.run().await?;

    println!("Server stopped gracefully.");
    Ok(())
}

Running the Example

Save the above code in examples/demo.rs.
Run the example using:
```
cargo run --example demo
```

Test the server with curl commands, for example:

curl --unix-socket /tmp/lazy-sock-demo.sock http://localhost/
curl --unix-socket /tmp/lazy-sock-demo.sock http://localhost/health
curl --unix-socket /tmp/lazy-sock-demo.sock -X POST http://localhost/echo -d 'Hello from curl!'

API Overview

LazySock::new(socket_path): Creates a new LazySock instance with the specified socket path.
lazy_sock!(socket_path): A macro to create a LazySock instance with default logging and prompt callbacks.
route(method, path, handler): Registers a route for a specific HTTP method and path with a handler function.
run(): Starts the server and listens for incoming connections.
Response: Supports json, html, text, and binary response types with automatic Content-Type and Content-Length headers.
Request: Provides methods to access the request method, path, headers, body, and query parameters.

Customization

Logging: Use with_log_callback to set a custom logging function.
Prompts: Use with_prompt_callback to handle prompt messages (e.g., for existing socket file warnings).
Socket Cleanup: Use with_cleanup_on_exit to control whether the socket file is removed on server shutdown (default: true).

Project Structure

lazy-sock/
├── examples/
│   └── demo.rs         # Example server implementation
├── src/
│   ├── lib.rs         # Main library code
│   ├── request.rs     # Request struct and methods
│   ├── response.rs    # Response struct and methods
│   └── router.rs      # Router and HTTP method definitions
├── Cargo.toml         # Project configuration
└── README.md          # This file

License

This project is licensed under the MIT License. See the LICENSE file for details.

Contributing

Contributions are welcome! Please submit issues or pull requests to the GitHub repository.

Contact

For questions or feedback, please open an issue on the GitHub repository.

lazy-sock 1.0.7