status-monitor/server/src/broker/subscriber.rs

use rumqttd::{local::LinkRx, Broker, Notification};
use common::{StatusMessage, MQTT_TOPIC};
use std::sync::Arc;

use crate::{bridge::ClientManager, storage::StorageRepository};

pub struct MqttSubscriber {
    link_rx: LinkRx,
    clients: Arc<ClientManager>,
    storage: Arc<dyn StorageRepository>,
}

impl MqttSubscriber {
    pub fn new(broker: &Broker, clients: Arc<ClientManager>, storage: Arc<dyn StorageRepository>) -> Self {
        let (mut link_tx, link_rx) = broker.link("internal-subscriber").unwrap();
        link_tx.subscribe(MQTT_TOPIC).unwrap();

        Self {
            link_rx,
            clients,
            storage,
        }
    }

    pub async fn run(&mut self) -> anyhow::Result<()> {
        while let Ok(notification) = self.link_rx.next().await {
            if let Notification::Forward(forward) = notification.unwrap() {
                let payload = StatusMessage::try_from(&forward.publish.payload[..])?;

                self.clients.broadcast(&payload).await;

                if let Err(e) = self.storage.record_uptime(&payload.agent).await {
                    eprintln!("failed to record uptime for {}: {}", &payload.agent, e);
                }
            }
        }

        Ok(())
    }
}