Crate safina_select

source · [−]

Expand description

This is a Rust library for awaiting multiple futures and getting the value of the first one that completes.

It is part of safina, a safe async runtime.

Features

forbid(unsafe_code)
Depends only on std
Good test coverage (96%)
Works with safina-executor or any async executor

Limitations

Can await 2-5 futures. Nest them if you need more.

Examples

use safina_async_test::async_test;
use safina_select::{select_ab, OptionAb};
let conn = match select_ab(make_new(addr.clone()), get_from_pool(addr.clone())).await {
    OptionAb::A(result) => result?,
    OptionAb::B(result) => result?,
};
// When both futures return the same type, you can use `take`:
let conn = select_ab(make_new(addr.clone()), get_from_pool(addr.clone())).await.take()?;

use safina_async_test::async_test;
use safina_select::{select_ab, OptionAb};
safina_timer::start_timer_thread();
let data = match select_ab(read_data(), safina_timer::sleep_until(deadline)).await {
    OptionAb::A(result) => Ok(result?),
    OptionAb::B(()) => Err("timeout"),
};

Documentation

https://docs.rs/safina-select

TO DO - Alternatives

tokio::select
- very popular
- Fast
- internally incredibly complicated
- full of unsafe
futures::select
- very popular
- proc macro, very complicated
- contains a little unsafe code