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#![deny(
clippy::all,
clippy::correctness,
clippy::suspicious,
clippy::style,
clippy::complexity,
clippy::perf,
clippy::pedantic,
clippy::nursery
)]
use anyhow::Result;
use opentelemetry::global::shutdown_tracer_provider;
use opentelemetry::sdk::export::metrics::aggregation::stateless_temporality_selector;
use opentelemetry::sdk::metrics::selectors;
use opentelemetry::sdk::propagation::TraceContextPropagator;
use opentelemetry::sdk::trace::{self};
use opentelemetry::sdk::Resource;
use opentelemetry::{global, KeyValue};
use opentelemetry_otlp::WithExportConfig;
use serde::de::DeserializeOwned;
use shared::config::Settings;
use std::str::FromStr;
use std::time::Duration;
use std::{future::Future, pin::Pin};
use tokio::sync::oneshot;
use tracing::log::error;
use tracing::{info, log::trace};
use tracing_subscriber::filter::Directive;
use tracing_subscriber::{fmt, prelude::*, EnvFilter};
pub type AnyhowResultFuture<T> = Pin<Box<dyn Future<Output = Result<T>> + Send>>;
pub trait Component: Send + Sync + 'static + Sized {
type Config: Default + Clone + DeserializeOwned + Send;
const SERVICE_NAME: &'static str;
fn start(
&self,
settings: Settings<Self::Config>,
stop: oneshot::Receiver<()>,
) -> AnyhowResultFuture<()>;
fn new() -> Self;
}
/// # Panics
/// Panics in case of an invalid `RUST_LOG` variable.
pub fn start_component<Y, C>(component: Y) -> AnyhowResultFuture<()>
where
Y: Component<Config = C>,
C: Default + Clone + DeserializeOwned + Send,
{
Box::pin(async move {
let settings = Settings::<Y::Config>::new(Y::SERVICE_NAME)?;
if let Some(meter_config) = settings
.opentelemetry
.as_ref()
.and_then(|f| f.metrics.clone())
{
let meter = opentelemetry_otlp::new_pipeline()
.metrics(
selectors::simple::histogram([0.1, 1.0, 2.0, 5.0, 10.0, 20.0, 50.0]),
stateless_temporality_selector(),
opentelemetry::runtime::Tokio,
)
.with_exporter(
opentelemetry_otlp::new_exporter()
.tonic()
.with_export_config(meter_config.into()),
)
.with_period(Duration::from_secs(3))
.with_timeout(Duration::from_secs(10))
.build()?;
// Using the opentelemetry_otlp meter
global::set_meter_provider(meter);
}
// Use the text propagator
global::set_text_map_propagator(TraceContextPropagator::new());
// Print debug errors
global::set_error_handler(|error| {
error!("OpenTelemetry error: {}", error);
})?;
if let Some(tracer_config) = settings
.opentelemetry
.as_ref()
.and_then(|f| f.traces.clone())
{
let tracer = opentelemetry_otlp::new_pipeline()
.tracing()
.with_trace_config(trace::config().with_resource(Resource::new(vec![
KeyValue::new("service.name", Y::SERVICE_NAME),
])))
.with_exporter(
opentelemetry_otlp::new_exporter()
.tonic()
.with_export_config(tracer_config.into()),
)
.install_batch(opentelemetry::runtime::Tokio)?;
let otel_layer = tracing_opentelemetry::layer().with_tracer(tracer);
tracing_subscriber::registry()
.with(fmt::layer())
.with(otel_layer)
.with(
// Use the info level as default
EnvFilter::builder()
.with_default_directive(Directive::from_str("info").unwrap())
.from_env()?,
)
.init();
} else {
// Setup tracing
tracing_subscriber::registry()
.with(fmt::layer())
.with(
// Use the info level as default
EnvFilter::builder()
.with_default_directive(Directive::from_str("info").unwrap())
.from_env()?,
)
.init();
}
// Finally starting nova
info!("Starting nova component {}", Y::SERVICE_NAME);
let (stop, stop_channel) = oneshot::channel();
tokio::spawn(async move {
trace!("started signal watching");
#[cfg(unix)]
tokio::signal::unix::signal(tokio::signal::unix::SignalKind::terminate())
.unwrap()
.recv()
.await;
#[cfg(not(unix))]
tokio::signal::ctrl_c().await.unwrap();
stop.send(()).unwrap();
shutdown_tracer_provider();
});
trace!(
"Starting component {component}",
component = Y::SERVICE_NAME
);
component.start(settings, stop_channel).await
})
}
#[macro_export]
macro_rules! ignite {
($c:ty) => {
#[allow(dead_code)]
fn main() -> anyhow::Result<()> {
use $crate::Component;
let rt = tokio::runtime::Runtime::new()?;
rt.block_on($crate::start_component(<$c as Component>::new()))?;
Ok(())
}
};
}
#[cfg(test)]
mod test {
use serde::Deserialize;
use tokio::sync::oneshot;
use crate as leash;
#[derive(Clone, Copy)]
struct TestComponent {}
#[derive(Default, Clone, Deserialize, Copy)]
struct TestComponentConfig {}
impl leash::Component for TestComponent {
type Config = TestComponentConfig;
const SERVICE_NAME: &'static str = "test_component";
fn start(
&self,
_settings: shared::config::Settings<Self::Config>,
_stop: oneshot::Receiver<()>,
) -> crate::AnyhowResultFuture<()> {
Box::pin(async move { Ok(()) })
}
fn new() -> Self {
Self {}
}
}
ignite!(TestComponent);
}
|
