Tokio：Rust 异步编程框架

https://github.com/tokio-rs/tokio
https://tokio.rs/

A runtime for writing reliable, asynchronous, and slim applications with
the Rust programming language. It is:

Fast: Tokio's zero-cost abstractions give you bare-metal
performance.
Reliable: Tokio leverages Rust's ownership, type system, and
concurrency model to reduce bugs and ensure thread safety.
Scalable: Tokio has a minimal footprint, and handles backpressure
and cancellation naturally.

Overview

Tokio is an event-driven, non-blocking I/O platform for writing
asynchronous applications with the Rust programming language. At a high
level, it provides a few major components:

A multithreaded, work-stealing based task scheduler.
A reactor backed by the operating system's event queue (epoll, kqueue,
IOCP, etc...).
Asynchronous TCP and UDP sockets.

These components provide the runtime components necessary for building
an asynchronous application.

Example

A basic TCP echo server with Tokio.

Make sure you activated the full features of the tokio crate on Cargo.toml:

[dependencies]
tokio = { version = "1.35.1", features = ["full"] }

Then, on your main.rs:

use tokio::net::TcpListener;
use tokio::io::{AsyncReadExt, AsyncWriteExt};

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    let listener = TcpListener::bind("127.0.0.1:8080").await?;

    loop {
        let (mut socket, _) = listener.accept().await?;

        tokio::spawn(async move {
            let mut buf = [0; 1024];

            // In a loop, read data from the socket and write the data back.
            loop {
                let n = match socket.read(&mut buf).await {
                    // socket closed
                    Ok(n) if n == 0 => return,
                    Ok(n) => n,
                    Err(e) => {
                        eprintln!("failed to read from socket; err = {:?}", e);
                        return;
                    }
                };

                // Write the data back
                if let Err(e) = socket.write_all(&buf[0..n]).await {
                    eprintln!("failed to write to socket; err = {:?}", e);
                    return;
                }
            }
        });
    }
}

More examples can be found here. For a larger "real world" example, see the
mini-redis repository.