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|
mod aggregate;
use anyhow::Result;
use async_nats::{
self,
jetstream::{
Context,
consumer::{Consumer, pull::Config},
},
};
use futures_util::{StreamExt as _, future};
use tokio::signal;
use tracing::{debug, error, info};
use warden_stack::tracing::SdkTracerProvider;
use crate::{cnfg::NatsConfig, state::AppHandle};
pub async fn serve(state: AppHandle, provider: SdkTracerProvider) -> Result<()> {
tokio::select! {
_ = run(state) => {}
_ = shutdown_signal(provider) => {}
};
Ok(())
}
async fn run(state: AppHandle) -> anyhow::Result<()> {
let consumer = get_or_create_stream(&state.services.jetstream, &state.config.nats).await?;
let limit = None;
consumer
.messages()
.await?
.for_each_concurrent(limit, |message| {
let state = state.clone();
tokio::spawn(async move {
if let Ok(message) = message
&& let Err(e) = aggregate::handle(message, state).await
{
error!("{}", e.to_string());
}
});
future::ready(())
})
.await;
Ok(())
}
async fn get_or_create_stream(
jetstream: &Context,
nats: &NatsConfig,
) -> anyhow::Result<Consumer<Config>> {
debug!(name = ?nats.name, subjects = ?nats.subjects, "getting or creating stream");
let stream = jetstream
.get_or_create_stream(async_nats::jetstream::stream::Config {
name: nats.name.to_string(),
subjects: nats.subjects.iter().map(|v| v.to_string()).collect(),
..Default::default()
})
.await?;
let durable = nats.durable_name.to_string();
// Get or create a pull-based consumer
let consumer = stream
.get_or_create_consumer(
durable.as_ref(),
async_nats::jetstream::consumer::pull::Config {
durable_name: Some(durable.to_string()),
..Default::default()
},
)
.await?;
info!(subject = ?nats.subjects, "ready to receive messages");
Ok(consumer)
}
async fn shutdown_signal(provider: SdkTracerProvider) -> Result<()> {
let ctrl_c = async {
signal::ctrl_c()
.await
.expect("failed to install Ctrl+C handler");
};
#[cfg(unix)]
let terminate = async {
signal::unix::signal(signal::unix::SignalKind::terminate())
.expect("failed to install signal handler")
.recv()
.await;
};
#[cfg(not(unix))]
let terminate = std::future::pending::<()>();
tokio::select! {
_ = ctrl_c => {
},
_ = terminate => {
},
}
let _ = provider.shutdown();
Ok(())
}
|
