https://github.com/rust-lang/rfcs/blob/master/text/2394-async_await.md
Just two macros to emulate a simple Async and Await using Futures (provided by futures-rs thanks to @cmgriffing for port it).
This is available in crates.io. Add this to your Cargo.toml:
[dependencies]
async-await = "0.2.1"
Here is a simple example, you need to do the #[macro_use] and use async_await::*; because of the expansion of the macros :)
#[macro_use]
extern crate async_await;
use async_await::*;
fn main() {
let computation = async!{"Hello world!"};
println!("{}", await!(computation));
}Another example using hyper, a shared client and a block in async :)
#[macro_use]
extern crate async_await;
extern crate hyper;
use std::io::Read;
use std::sync::Arc;
use async_await::*;
use hyper::Client;
use hyper::header::Connection;
fn main() {
let client = Arc::new(Client::new());
let client_comp = client.clone();
let computation = async!{{
let mut res = client_comp.get("http://rust-lang.org/")
.header(Connection::close())
.send().unwrap();
let mut body = String::new();
res.read_to_string(&mut body).unwrap();
body
}};
println!("Before await!");
println!("{}", await!{computation});
println!("After await!");
}You can also provide a default value in case that the computation fails:
#[macro_use]
extern crate async_await;
use async_await::*;
fn main() {
let computation = async!{panic!(":()")};
assert_eq!("Recovered!", await!{computation, "Recovered!"});
}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.
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.
React
Typescript
Django
Laravel
Facebook
Microsoft
Google
Alibaba
D3
Tencent