Multi stream
Aggregate multiple streams of different types in a single stream with an item type that is a tuple of the incoming stream items.
Important
- The streams are polled and a new stream item is emitted if any if ANY of the streams emits a new value
- The values are cloned when the new stream value is emitted so incoming stream items must be clonable
- Items in the tuple being emitted are all returned in
Option as their corresponding stream may never emit
- The macro supports up to 12 input streams only
Example usage
- Add to your Cargo.toml file
toml
[dependencies]
multi_stream = "0.1.0"
- Import the
muti_stream macro and pass in stream instances to create a new stream:
```rust
use asyncstream::stream;
use futures::StreamExt;
use multistream::multi_stream;
use rand::random;
use std::time::Duration;
use tokio::time::sleep;
[tokio::main]
async fn main() {
let a = stream! {
sleep(Duration::frommillis(random::().into())).await;
yield 1;
sleep(Duration::frommillis(random::().into())).await;
yield 2;
sleep(Duration::frommillis(random::().into())).await;
yield 3;
};
let b = stream! {
sleep(Duration::frommillis(random::().into())).await;
yield 4;
sleep(Duration::frommillis(random::().into())).await;
yield 5;
sleep(Duration::frommillis(random::().into())).await;
yield 6;
};
multi_stream!(a, b)
.for_each(|(a, b)| async move {
//emitted when any of the streams has a new value
dbg!((a, b));
})
.await;
}
```