Async version of the Rust standard library

This crate provides an async version of std. It provides all the interfaces you are used to, but in an async version and ready for Rust's async/await syntax.

Documentation

async-std comes with extensive API documentation and a book.

Quickstart

Add the following lines to your Cargo.toml:

[dependencies]
async-std = "0.99"

Or use cargo add if you have it installed:

$ cargo add async-std

Hello world

use async_std::task;

fn main() {
    task::block_on(async {
        println!("Hello, world!");
    })
}

Low-Friction Sockets with Built-In Timeouts

use std::time::Duration;

use async_std::{
    prelude::*,
    task,
    io,
    net::TcpStream,
};

async fn get() -> io::Result<Vec<u8>> {
    let mut stream = TcpStream::connect("example.com:80").await?;
    stream.write_all(b"GET /index.html HTTP/1.0\r\n\r\n").await?;

    let mut buf = vec![];

    io::timeout(Duration::from_secs(5), async {
        stream.read_to_end(&mut buf).await?;
        Ok(buf)
    }).await
}

fn main() {
    task::block_on(async {
        let raw_response = get().await.expect("request");
        let response = String::from_utf8(raw_response)
            .expect("utf8 conversion");
        println!("received: {}", response);
    });
}

Take a look around

Clone the repo:

git clone git@github.com:async-rs/async-std.git && cd async-std

Generate docs:

cargo doc --features docs.rs --open

Check out the examples. To run an example:

cargo run --example hello-world

Contributing

See our contribution document.

License

Licensed under either of

• Apache License, Version 2.0 (LICENSE-APACHE or http://www.apache.org/licenses/LICENSE-2.0)
• MIT license (LICENSE-MIT or http://opensource.org/licenses/MIT)

at your option.

Contribution

Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.