uni-stream

uni-stream is a Rust library for unified operation of TcpStream and UdpStream, designed to make your service support UDP and TCP (such as proxy services) with a single code implementation. On top of that the library provides the ability to customize dns server resolution.

Features

• Generic: uni-stream provides an abstraction of UDP and TCP streams, which is exposed through some traits, making it easy for users to make secondary abstractions.

• Customizable: uni-stream provides functions that allow users to customize the resolution of dns services for TCP or UDP connections.

Usage

To use uni-stream in your Rust project, simply add it as a dependency in your Cargo.toml file:

[dependencies]
uni-stream = "0.0.1"

Then, you can import and use the library in your Rust code.The following is a generic-based implementation of echo_server:

use tokio::io::AsyncReadExt;
use tokio::io::AsyncWriteExt;
use uni_stream::stream::ListenerProvider;
use uni_stream::stream::StreamAccept;
use uni_stream::stream::TcpListenerProvider;
use uni_stream::stream::UdpListenerProvider;

async fn echo_server<P: ListenerProvider>(
    server_addr: &str,
) -> Result<(), Box<dyn std::error::Error>> {
    let listener = P::bind(server_addr).await?;
    println!("run local server:{server_addr}");
    loop {
        // Accept incoming connections
        let (mut stream, addr) = listener.accept().await?;
        println!("Connected from {}", addr);

        // Process each connection concurrently
        tokio::spawn(async move {
            // Read data from client
            let mut buf = vec![0; 1024];
            loop {
                let n = match stream.read(&mut buf).await {
                    Ok(n) => n,
                    Err(e) => {
                        println!("Error reading: {}", e);
                        return;
                    }
                };

                // If no data received, assume disconnect
                if n == 0 {
                    return;
                }

                // Echo data back to client
                if let Err(e) = stream.write_all(&buf[..n]).await {
                    println!("Error writing: {}", e);
                    return;
                }

                println!("Echoed {} bytes to {}", n, addr);
            }
        });
    }
}

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    let run_udp: bool = true;
    if run_udp {
        echo_server::<UdpListenerProvider>("0.0.0.0:8080").await
    } else {
        echo_server::<TcpListenerProvider>("0.0.0.0:8080").await
    }
}

Customized dns resolution servers:

use uni_stream::addr::set_custom_dns_server;
// use google and alibaba dns server
set_custom_dns_server(&["8.8.8.8".parse().unwrap(), "233.5.5.5".parse().unwrap()]).unwrap();

For more details on how to use uni-stream, please refer to the examples.

Contributing

Contributions to uni-stream are welcome! If you would like to contribute to the library, please follow the standard Rust community guidelines for contributing, including opening issues, submitting pull requests, and providing feedback.

License

uni-stream is licensed under the MIT License, which allows for free use, modification, and distribution, subject to the terms and conditions outlined in the license.

We hope that uni-stream is useful for your projects! If you have any questions or need further assistance, please don't hesitate to contact us or open an issue in the repository.