link trace context to events

sentry-core/src/performance.rs

@@ -109,7 +109,7 @@ struct TransactionInner {
 
 type TransactionArc = Arc<Mutex<TransactionInner>>;
 
-#[derive(Debug)]
+#[derive(Clone, Debug)]
 pub struct Transaction {
     inner: TransactionArc,
 }
@@ -174,7 +174,7 @@ impl Transaction {
     }
 }
 
-#[derive(Debug)]
+#[derive(Clone, Debug)]
 pub struct Span {
     transaction: TransactionArc,
     span: protocol::Span,

sentry-core/src/scope/real.rs

@@ -265,8 +265,8 @@ impl Scope {
         Some(event)
     }
 
-    pub fn set_span(&mut self) {
-        // self.
+    pub fn set_span(&mut self, span: Option<TransactionOrSpan>) {
+        self.span = Arc::new(span);
     }
 
     pub(crate) fn update_session_from_event(&self, event: &Event<'static>) {

sentry/examples/performance-demo.rs

@@ -34,6 +34,13 @@ fn main() {
     thread::sleep(Duration::from_millis(100));
 
     let span2 = span1.start_child("span2");
+    sentry::configure_scope(|scope| {
+        scope.set_span(Some(sentry::TransactionOrSpan::Span(span2.clone())))
+    });
+    sentry::capture_message(
+        "A message that should have a trace context",
+        sentry::Level::Info,
+    );
     thread::sleep(Duration::from_millis(200));
     span2.finish();