#futures #async #iterator


Converts Iterator into real asynchronous Stream

3 releases

0.1.2 Oct 23, 2020
0.1.1 Oct 23, 2020
0.1.0 Oct 23, 2020

#282 in Asynchronous

Custom license



This crate provides a trait that can convert an Iterator to a Stream. It uses the futures crate to create an executor that gets the values from the iterator in a separate thread pool

It differs from the iter() function because iterator consumption is done in a separate thread. The stream is then really asynchronous if the iterator is blocking

The ThreadPool needed to execute tasks can be either create automatically (when using to_stream), or explicitly specified using to_stream_with_pool. The later is more flexible (and efficient) as it allows to share the same pool for multiple streams


use iterstream::IterStream;
use futures::stream::StreamExt;
use futures::executor::ThreadPool;

let vals = vec![1, 2, 3, 4, 5];
let stream = vals.into_iter().to_stream_with_pool(10, ThreadPool::new().unwrap());
let c: Vec<_> = stream.collect().await;
assert_eq!(vec![1,2,3,4, 5], c);


  • Michaël Hauspie


  • This crate is provided under CeCILL-B licence


~18K SLoC