Fix url attribute on navigate and navigation span

When the navigation span is started, the new URL is not available to us
yet. We have to defer the adding of the url attribute to the span to
the end of the navigation span.

common/frame_session.go

@@ -243,6 +243,11 @@ func (fs *FrameSession) initEvents() {
 			// If there is an active span for main frame,
 			// end it before exiting so it can be flushed
 			if fs.mainFrameSpan != nil {
+				// The url needs to be added here instead of at the start of the span
+				// because at the start of the span we don't know the correct url for
+				// the page we're navigating to. At the end of the span we do have this
+				// information.
+				fs.mainFrameSpan.SetAttributes(attribute.String("navigation.url", fs.manager.MainFrame().URL()))
 				fs.mainFrameSpan.End()
 				fs.mainFrameSpan = nil
 			}
@@ -795,10 +800,10 @@ func (fs *FrameSession) onFrameNavigated(frame *cdp.Frame, initial bool) {
 		return
 	}
 
-	fs.processNavigationSpan(frame.ParentID == "", frame.URL, frame.ID)
+	fs.processNavigationSpan(frame.ParentID == "", frame.ID)
 }
 
-func (fs *FrameSession) processNavigationSpan(isMainFrame bool, url string, id cdp.FrameID) {
+func (fs *FrameSession) processNavigationSpan(isMainFrame bool, id cdp.FrameID) {
 	// Trace navigation only for the main frame.
 	// TODO: How will this affect sub frames such as iframes?
 	if !isMainFrame {
@@ -807,11 +812,16 @@ func (fs *FrameSession) processNavigationSpan(isMainFrame bool, url string, id c
 
 	// End the navigation span if it is non-nil
 	if fs.mainFrameSpan != nil {
+		// The url needs to be added here instead of at the start of the span
+		// because at the start of the span we don't know the correct url for
+		// the page we're navigating to. At the end of the span we do have this
+		// information.
+		fs.mainFrameSpan.SetAttributes(attribute.String("navigation.url", fs.manager.MainFrame().URL()))
 		fs.mainFrameSpan.End()
 	}
 
 	_, fs.mainFrameSpan = TraceNavigation(
-		fs.ctx, fs.targetID.String(), trace.WithAttributes(attribute.String("navigation.url", url)),
+		fs.ctx, fs.targetID.String(),
 	)
 
 	var (
@@ -875,7 +885,7 @@ func (fs *FrameSession) onFrameStartedLoading(frameID cdp.FrameID) {
 	frame, ok := fs.manager.getFrameByID(frameID)
 	if !fs.navCaught && ok {
 		fs.navCaught = true
-		fs.processNavigationSpan(frame.page.frameManager.MainFrame() == frame, frame.URL(), frame.id)
+		fs.processNavigationSpan(frame.page.frameManager.MainFrame() == frame, frame.id)
 	}
 
 	fs.manager.frameLoadingStarted(frameID)