async-nats 0.49.0

A async Rust NATS client
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42

use futures::StreamExt;

#[tokio::main]
async fn main() -> Result<(), async_nats::Error> {
    let client = async_nats::connect("nats://localhost:4222").await?;

    // NATS-DOC-START
    // Multiple responders - only first response is returned
    let mut sub_a = client.subscribe("calc.add").await?;
    let client_a = client.clone();
    tokio::spawn(async move {
        while let Some(msg) = sub_a.next().await {
            let response = "calculated result from A".to_string();
            if let Some(reply) = msg.reply {
                client_a.publish(reply, response.into()).await.ok();
            }
        }
    });

    let mut sub_b = client.subscribe("calc.add").await?;
    let client_b = client.clone();
    tokio::spawn(async move {
        while let Some(msg) = sub_b.next().await {
            let response = "calculated result from B".to_string();
            if let Some(reply) = msg.reply {
                client_b.publish(reply, response.into()).await.ok();
            }
        }
    });

    // Gets one response
    let response = client.request("calc.add", "data".into()).await?;
    println!(
        "Got response: {}",
        String::from_utf8_lossy(&response.payload)
    );
    // NATS-DOC-END

    tokio::time::sleep(tokio::time::Duration::from_millis(100)).await;

    Ok(())
}