Add nested span in example, use ctx.lookup_current

Author: maximebedard

opentelemetry-appender-tracing/examples/basic.rs

@@ -23,6 +23,10 @@ fn main() {
     let layer = layer::OpenTelemetryTracingBridge::new(&provider);
     tracing_subscriber::registry().with(layer).init();
 
+    info_span!("my-span").in_scope(|| {
+        info!(target: "my-system", "an info log");
+    })
+
     error!(name: "my-event-name", target: "my-system", event_id = 20, user_name = "otel", user_email = "[email protected]");
     drop(provider);
 }

opentelemetry-appender-tracing/src/layer.rs

@@ -105,7 +105,7 @@ where
         log_record.severity_text = Some(meta.level().to_string().into());
 
         // Extract the trace_id & span_id from the opentelemetry extension.
-        if let Some((trace_id, span_id)) = ctx.event_span(event).and_then(|span| {
+        if let Some((trace_id, span_id)) = ctx.lookup_current().and_then(|span| {
             span.extensions()
                 .get::<OtelData>()
                 .and_then(|ext| ext.builder.trace_id.zip(ext.builder.span_id))