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#![deny(
clippy::all,
clippy::correctness,
clippy::suspicious,
clippy::style,
clippy::complexity,
clippy::perf,
clippy::pedantic,
clippy::nursery,
unsafe_code
)]
#![allow(clippy::redundant_pub_crate)]
use async_nats::{Client, HeaderMap, HeaderValue};
use config::Gateway;
use leash::{AnyhowResultFuture, Component};
use opentelemetry::{global, propagation::Injector};
use shared::{
config::Settings,
payloads::{CachePayload, DispatchEventTagged},
};
use std::{convert::TryFrom, future::Future, pin::Pin, str::FromStr};
use tokio::{select, sync::oneshot};
use tracing_opentelemetry::OpenTelemetrySpanExt;
use twilight_gateway::{Event, Shard, ShardId};
pub mod config;
use tracing::{debug, error, info, info_span, instrument, Instrument};
use twilight_model::gateway::event::DispatchEvent;
struct MetadataMap<'a>(&'a mut HeaderMap);
impl<'a> Injector for MetadataMap<'a> {
fn set(&mut self, key: &str, value: String) {
self.0.insert(key, HeaderValue::from_str(&value).unwrap());
}
}
pub struct GatewayServer {}
impl Component for GatewayServer {
type Config = Gateway;
const SERVICE_NAME: &'static str = "gateway";
fn start(
&self,
settings: Settings<Self::Config>,
mut stop: oneshot::Receiver<()>,
) -> AnyhowResultFuture<()> {
Box::pin(async move {
let mut shard = Shard::new(
ShardId::new(settings.shard, settings.shard_total),
settings.token.clone(),
settings.intents,
);
let nats = Into::<Pin<Box<dyn Future<Output = anyhow::Result<Client>> + Send>>>::into(
settings.nats,
)
.await?;
loop {
select! {
event = shard.next_event() => {
match event {
Ok(event) => {
let _ = handle_event(event, &nats)
.await
.map_err(|err| error!(error = ?err, "event publish failed"));
},
Err(source) => {
if source.is_fatal() {
break;
}
continue;
}
}
},
_ = (&mut stop) => break
};
}
info!("stopping shard...");
Ok(())
})
}
fn new() -> Self {
Self {}
}
}
#[instrument]
async fn handle_event(event: Event, nats: &Client) -> anyhow::Result<()> {
if let Event::Ready(ready) = event {
info!(username = ready.user.name, "logged in");
} else {
let name = event.kind().name();
if let Ok(dispatch_event) = DispatchEvent::try_from(event) {
let name = name.unwrap();
debug!(event_name = name, "handling dispatch event");
let data = CachePayload {
data: DispatchEventTagged(dispatch_event),
};
let value = serde_json::to_string(&data)?;
let bytes = bytes::Bytes::from(value);
let span = info_span!("nats send");
let mut header_map = HeaderMap::new();
let context = span.context();
global::get_text_map_propagator(|propagator| {
propagator.inject_context(&context, &mut MetadataMap(&mut header_map));
});
nats.publish_with_headers(format!("nova.cache.dispatch.{name}"), header_map, bytes)
.instrument(info_span!("sending to nats"))
.await?;
}
}
Ok(())
}
|
