94 lines
2.5 KiB
Rust
94 lines
2.5 KiB
Rust
use rocket::futures::channel::mpsc as rocket_mpsc;
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use rocket::futures::StreamExt;
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use rocket::tokio;
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/// Handles all the raw events being streamed from balancers and parses and filters them into only the events we care about.
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pub struct EventBus {
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events_rx: rocket_mpsc::Receiver<rocket_ws::Message>,
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events_tx: rocket_mpsc::Sender<rocket_ws::Message>,
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bus_tx: tokio::sync::broadcast::Sender<EventBusEvent>,
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}
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impl EventBus {
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pub fn new() -> Self {
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let (events_tx, events_rx) = rocket_mpsc::channel(100);
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let (bus_tx, _) = tokio::sync::broadcast::channel(100);
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Self {
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events_rx,
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events_tx,
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bus_tx,
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}
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}
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pub async fn run(&mut self) {
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info!("EventBus started");
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loop {
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tokio::select! {
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Some(event) = self.events_rx.next() => {
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info!("EventBus received: {event}");
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self.handle_event(event);
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}
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else => {
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warn!("EventBus stopped");
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break;
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}
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}
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}
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}
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fn handle_event(&self, event: rocket_ws::Message) {
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info!("Received event: {}", event);
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if self.bus_tx.receiver_count() == 0 {
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return;
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}
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match self.bus_tx.send(event) {
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Ok(count) => {
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info!("Event sent to {count} subscribers");
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}
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Err(err) => {
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error!("Error sending event to subscribers: {}", err);
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}
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}
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}
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pub fn subscriber(&self) -> EventBusSubscriber {
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EventBusSubscriber::new(self.bus_tx.clone())
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}
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pub fn writer(&self) -> EventBusWriter {
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EventBusWriter::new(self.events_tx.clone())
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}
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}
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pub type EventBusEvent = rocket_ws::Message;
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/// Enables subscriptions to the event bus
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pub struct EventBusSubscriber {
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bus_tx: tokio::sync::broadcast::Sender<EventBusEvent>,
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}
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/// Enables subscriptions to the event bus
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pub struct EventBusWriter {
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bus_tx: rocket_mpsc::Sender<EventBusEvent>,
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}
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impl EventBusWriter {
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pub fn new(bus_tx: rocket_mpsc::Sender<EventBusEvent>) -> Self {
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Self { bus_tx }
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}
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pub fn write(&self) -> rocket_mpsc::Sender<EventBusEvent> {
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self.bus_tx.clone()
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}
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}
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impl EventBusSubscriber {
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pub fn new(bus_tx: tokio::sync::broadcast::Sender<EventBusEvent>) -> Self {
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Self { bus_tx }
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}
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pub fn subscribe(&self) -> tokio::sync::broadcast::Receiver<EventBusEvent> {
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self.bus_tx.subscribe()
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}
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}
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