Move tracing init into own function

src/main.rs

@@ -603,10 +603,10 @@ fn render(
         .body(min))
 }
 
-#[actix_rt::main]
-async fn main() -> Result<(), anyhow::Error> {
-    dotenv::dotenv().ok();
-
+fn init_tracing(
+    service_name: &'static str,
+    opentelemetry_url: Option<&Url>,
+) -> Result<(), anyhow::Error> {
     opentelemetry::global::set_text_map_propagator(TraceContextPropagator::new());
 
     LogTracer::init()?;
@@ -622,12 +622,12 @@ async fn main() -> Result<(), anyhow::Error> {
         .with(format_layer)
         .with(ErrorLayer::default());
 
-    if let Some(url) = &CONFIG.opentelemetry_url {
+    if let Some(url) = opentelemetry_url {
         let tracer =
             opentelemetry_otlp::new_pipeline()
                 .tracing()
                 .with_trace_config(opentelemetry::sdk::trace::config().with_resource(
-                    Resource::new(vec![KeyValue::new("service.name", "pict-rs-proxy")]),
+                    Resource::new(vec![KeyValue::new("service.name", service_name)]),
                 ))
                 .with_exporter(
                     opentelemetry_otlp::new_exporter()
@@ -645,6 +645,15 @@ async fn main() -> Result<(), anyhow::Error> {
         tracing::subscriber::set_global_default(subscriber)?;
     }
 
+    Ok(())
+}
+
+#[actix_rt::main]
+async fn main() -> Result<(), anyhow::Error> {
+    dotenv::dotenv().ok();
+
+    init_tracing("pict-rs-proxy", CONFIG.opentelemetry_url.as_ref())?;
+
     HttpServer::new(move || {
         let client = Client::builder()
             .header("User-Agent", "pict-rs-frontend, v0.1.0")