aws-iot-device-sdk-rust 0.8.1

An easy to use SDK for connecting to AWS IoT Core.
Documentation 
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use crate::error::AWSIoTError;
use crate::settings::{get_mqtt_options_async, AWSIoTSettings};
use log::warn;
use rumqttc::{self, AsyncClient, Event, EventLoop, Incoming, NetworkOptions, QoS};
use tokio::sync::broadcast::{self, Receiver, Sender};

pub async fn async_event_loop_listener(
    (mut eventloop, incoming_event_sender): (EventLoop, Sender<Incoming>),
) -> Result<(), AWSIoTError> {
    loop {
        match eventloop.poll().await {
            Ok(event) => {
                if let Event::Incoming(i) = event {
                    if let Err(e) = incoming_event_sender.send(i) {
                        warn!("Error sending incoming event: {:?}", e);
                    }
                }
            }
            Err(e) => return Err(e.into()),
        }
    }
}

pub struct AWSIoTAsyncClient {
    client: AsyncClient,
    incoming_event_sender: Sender<Incoming>,
}

impl AWSIoTAsyncClient {
    /// Create new AWSIoTAsyncClient. Input argument should be the AWSIoTSettings. Returns a tuple where the first element is the
    /// AWSIoTAsyncClient, and the second element is a new tuple with the eventloop and incoming
    /// event sender. This tuple should be sent as an argument to the async_event_loop_listener.
    pub async fn new(
        settings: AWSIoTSettings,
    ) -> Result<(AWSIoTAsyncClient, (EventLoop, Sender<Incoming>)), AWSIoTError> {
        let timeout = settings
            .mqtt_options_overrides
            .as_ref()
            .and_then(|opts| opts.conn_timeout);
        let mqtt_options = get_mqtt_options_async(settings).await?;

        let (client, mut eventloop) = AsyncClient::new(mqtt_options, 10);
        if let Some(timeout) = timeout {
            let mut network_options = NetworkOptions::new();
            network_options.set_connection_timeout(timeout);
            eventloop.set_network_options(network_options);
        }

        let (request_tx, _) = broadcast::channel(50);
        Ok((
            AWSIoTAsyncClient {
                client,
                incoming_event_sender: request_tx.clone(),
            },
            (eventloop, request_tx),
        ))
    }

    /// Subscribe to a topic.
    pub async fn subscribe<S: Into<String>>(
        &self,
        topic: S,
        qos: QoS,
    ) -> Result<(), AWSIoTError> {
        self.client.subscribe(topic, qos).await.map_err(Into::into)
    }

    /// Publish to topic.
    pub async fn publish<S, V>(
        &self,
        topic: S,
        qos: QoS,
        payload: V,
    ) -> Result<(), AWSIoTError>
    where
        S: Into<String>,
        V: Into<Vec<u8>>,
    {
        self.client
            .publish(topic, qos, false, payload)
            .await
            .map_err(Into::into)
    }

    /// Get a receiver of the incoming messages. Send this to any function that wants to read the
    /// incoming messages from IoT Core.
    pub async fn get_receiver(&self) -> Receiver<Incoming> {
        self.incoming_event_sender.subscribe()
    }

    /// If you want to use the Rumqttc AsyncClient and EventLoop manually, this method can be used
    /// to get the AsyncClient.
    pub async fn get_client(self) -> AsyncClient {
        self.client
    }
}