ruststream 0.7.5

Async messaging framework for Rust: broker-agnostic traits, router, codecs, and a conformance harness for broker authors.
Documentation 
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use ruststream::memory::MemoryBroker;
use ruststream::runtime::{AppInfo, ContextKind, Outgoing, PublishTransform, Reads, RustStream};
use ruststream::subscriber;
use serde::{Deserialize, Serialize};

#[derive(Deserialize)]
struct Order {
    id: u32,
}

#[derive(Serialize, ruststream::Outgoing)]
struct Receipt {
    id: u32,
}

struct Stamp;

impl<K: ContextKind, Options> PublishTransform<K, Options> for Stamp {
    type Destination = Reads;

    fn apply(
        &self,
        out: &mut Outgoing<'_>,
        _options: &mut Option<Options>,
        _cx: &K::View<'_>,
    ) {
        out.headers_mut().insert("x-stamp", b"1".to_vec());
    }
}

#[subscriber("orders", reply("receipts"))]
async fn confirm(order: &Order) -> Receipt {
    Receipt { id: order.id }
}

// A step rides the position the `.out(marker, policy)` before it named, and there is none here.
fn main() {
    RustStream::new(AppInfo::new("app", "0.1.0")).with_broker(MemoryBroker::new(), |b| {
        b.include(confirm).transform(Stamp);
    });
}