lapin 4.6.0

AMQP client library
Documentation 
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use lapin::{
    BasicProperties, Confirmation, Connection, ConnectionProperties, ConsumerDelegate,
    message::DeliveryResult, options::*, types::FieldTable,
};
use std::{
    future::Future,
    pin::Pin,
    sync::{
        Arc,
        atomic::{AtomicU8, Ordering},
    },
    time,
};
use tracing::info;

#[derive(Clone, Debug)]
struct Subscriber {
    hello_world: Arc<AtomicU8>,
}

impl ConsumerDelegate for Subscriber {
    fn on_new_delivery(
        &self,
        delivery: DeliveryResult,
    ) -> Pin<Box<dyn Future<Output = ()> + Send>> {
        info!(message=?delivery, "received message");
        let subscriber = self.clone();
        Box::pin(async move {
            info!(message=?delivery, "handling message");
            if let Some(delivery) = delivery.unwrap() {
                info!(data=%std::str::from_utf8(&delivery.data).unwrap());

                assert_eq!(delivery.data, b"Hello world!");

                subscriber.hello_world.fetch_add(1, Ordering::SeqCst);

                delivery.ack(BasicAckOptions::default()).await.unwrap();
            }
        })
    }
}

async fn tokio_main() {
    if std::env::var("RUST_LOG").is_err() {
        unsafe { std::env::set_var("RUST_LOG", "info") };
    }

    let _ = tracing_subscriber::fmt::try_init();

    let addr = std::env::var("AMQP_ADDR").unwrap_or_else(|_| "amqp://127.0.0.1:5672/%2f".into());

    let conn = Connection::connect(&addr, ConnectionProperties::default())
        .await
        .expect("connection error");

    info!(configuration=?conn.configuration(), "CONNECTED");

    //now connected

    //send channel
    let channel_a = conn.create_channel().await.expect("create_channel");
    //receive channel
    let channel_b = conn.create_channel().await.expect("create_channel");

    channel_a
        .confirm_select(ConfirmSelectOptions::default())
        .await
        .expect("confirm_select");

    //create the hello queue
    let queue = channel_a
        .queue_declare(
            "hello-async".into(),
            QueueDeclareOptions::durable(),
            FieldTable::default(),
        )
        .await
        .expect("queue_declare");
    info!(state=?conn.status());
    info!(?queue, "Declared queue");

    //purge the hello queue in case it already exists with contents in it
    let queue = channel_a
        .queue_purge("hello-async".into(), QueuePurgeOptions::default())
        .await
        .expect("queue_purge");
    info!(state=?conn.status());
    info!(purge=?queue, "Purged queue");

    info!("will consume");
    let hello_world = Arc::new(AtomicU8::new(0));
    let subscriber = Subscriber {
        hello_world: hello_world.clone(),
    };
    let consumer = channel_b
        .basic_consume(
            "hello-async".into(),
            "my_consumer".into(),
            BasicConsumeOptions::default(),
            FieldTable::default(),
        )
        .await
        .expect("basic_consume");

    info!("will publish");
    let payload = b"Hello world!";
    let confirm = channel_a
        .basic_publish(
            "".into(),
            "hello-async".into(),
            BasicPublishOptions::default(),
            payload,
            BasicProperties::default(),
        )
        .await
        .expect("basic_publish")
        .await
        .expect("publisher-confirms");
    assert_eq!(confirm, Confirmation::Ack(None));

    consumer.set_delegate(subscriber);
    info!(state=?conn.status());

    info!("will publish");
    let confirm = channel_a
        .basic_publish(
            "".into(),
            "hello-async".into(),
            BasicPublishOptions::default(),
            payload,
            BasicProperties::default(),
        )
        .await
        .expect("basic_publish")
        .await
        .expect("publisher-confirms");
    assert_eq!(confirm, Confirmation::Ack(None));
    info!(state=?conn.status());

    tokio::time::sleep(time::Duration::from_millis(500)).await;
    assert_eq!(hello_world.load(Ordering::SeqCst), 2);
}

#[tokio::main]
async fn main() {
    tokio_main().await
}

#[tokio::test]
async fn connection() {
    tokio_main().await
}