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pub mod grpc;
mod reload;
mod route;
mod publish;
mod load;
use std::sync::Arc;
use anyhow::Result;
use async_nats::jetstream::{consumer::{pull, Consumer}, Context};
use tokio::signal;
use tracing::{error, trace};
use warden_stack::{Configuration, tracing::SdkTracerProvider};
use futures_util::StreamExt;
use crate::{cnfg::Nats, state::{AppHandle, AppState, Services}};
pub async fn serve(
services: Services,
config: Configuration,
provider: SdkTracerProvider,
) -> anyhow::Result<()> {
let state = Arc::new(AppState::new(services, config).await?);
tokio::select! {
_ = futures_util::future::try_join(reload::reload(Arc::clone(&state)), run(state)) => {}
_ = shutdown_signal(provider) => {}
};
Ok(())
}
async fn run(state: AppHandle) -> anyhow::Result<()> {
let config = Arc::clone(&state);
let (consumer, _) = tokio::join!(
get_or_create_stream(&state.services.jetstream, &state.config.nats),
load::get_routing_config(Arc::clone(&config))
);
let consumer = consumer?;
// Consume messages from the consumer
while let Some(Ok(message)) = consumer.messages().await?.next().await {
if let Err(e) = route::route(message, Arc::clone(&state)).await {
error!("{}", e.to_string());
}
}
Ok(())
}
async fn get_or_create_stream(
jetstream: &Context,
nats: &Nats,
) -> anyhow::Result<Consumer<pull::Config>> {
trace!(name = ?nats.name, "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(Into::into).collect(),
max_messages: nats.max_messages,
..Default::default()
})
.await?;
let durable = nats.durable_name.to_string();
// Get or create a pull-based consumer
Ok(stream
.get_or_create_consumer(
durable.as_ref(),
async_nats::jetstream::consumer::pull::Config {
durable_name: Some(durable.to_string()),
..Default::default()
},
)
.await?)
}
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(())
}
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