1 files changed, 97 insertions, 37 deletions

diff --git a/libs/leash/src/lib.rs b/libs/leash/src/lib.rs
index 91bfaf5..f3c9472 100644
--- a/libs/leash/src/lib.rs
+++ b/libs/leash/src/lib.rs
@@ -6,10 +6,13 @@
     clippy::complexity,
     clippy::perf,
     clippy::pedantic,
-    clippy::nursery,
+    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;
@@ -18,8 +21,10 @@ 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};
@@ -35,54 +40,111 @@ pub trait Component: Send + Sync + 'static + Sized {
         stop: oneshot::Receiver<()>,
     ) -> AnyhowResultFuture<()>;
     fn new() -> Self;
+}
 
-    fn _internal_start(self) -> AnyhowResultFuture<()> {
-        Box::pin(async move {
-            global::set_text_map_propagator(TraceContextPropagator::new());
+/// # 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([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", Self::SERVICE_NAME),
+                    KeyValue::new("service.name", Y::SERVICE_NAME),
                 ])))
-                .with_exporter(opentelemetry_otlp::new_exporter().tonic().with_env())
+                .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);
 
-            let telemetry = tracing_opentelemetry::layer().with_tracer(tracer);
-
+            tracing_subscriber::registry()
+                .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(telemetry)
                 .with(
+                    // Use the info level as default
                     EnvFilter::builder()
                         .with_default_directive(Directive::from_str("info").unwrap())
                         .from_env()?,
                 )
                 .init();
+        }
 
-            info!("Starting nova");
-            let settings = Settings::<Self::Config>::new(Self::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))]
-                return tokio::signal::ctrl_c().await.unwrap();
-
-                stop.send(()).unwrap();
-            });
-
-            trace!(
-                "Starting component {component}",
-                component = Self::SERVICE_NAME
-            );
-            self.start(settings?, stop_channel).await
-        })
-    }
+        // 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))]
+            return 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]
@@ -90,9 +152,9 @@ macro_rules! ignite {
     ($c:ty) => {
         #[allow(dead_code)]
         fn main() -> anyhow::Result<()> {
-            use leash::Component;
+            use $crate::Component;
             let rt = tokio::runtime::Runtime::new()?;
-            rt.block_on(<$c as Component>::new()._internal_start())?;
+            rt.block_on($crate::start_component(<$c as Component>::new()))?;
             Ok(())
         }
     };
@@ -128,7 +190,5 @@ mod test {
         }
     }
 
-    
-
     ignite!(TestComponent);
 }