use epoch

Author: buenaflor

flutter/lib/src/event_processor/native_app_start_event_processor.dart

@@ -39,6 +39,7 @@ class NativeAppStartEventProcessor implements EventProcessor {
       if (measurement.value >= _maxAppStartMillis) {
         return event;
       }
+      print('hello app');
       event.measurements[measurement.name] = measurement;
     }
     return event;

flutter/lib/src/navigation/sentry_navigator_observer.dart

@@ -127,7 +127,7 @@ class SentryNavigatorObserver extends RouteObserver<PageRoute<dynamic>> {
     SchedulerBinding.instance.addPostFrameCallback((timeStamp) {
       approximationEndTimestamp = DateTime.now();
       approximationDurationMillis =
-          approximationEndTimestamp!.millisecond - startTime.millisecond;
+          approximationEndTimestamp!.millisecondsSinceEpoch - startTime.millisecondsSinceEpoch;
     });
 
     SentryDisplayTracker().startTimeout(routeName ?? 'Unknown', () {
@@ -139,6 +139,7 @@ class SentryNavigatorObserver extends RouteObserver<PageRoute<dynamic>> {
           'time_to_initial_display', approximationDurationMillis!,
           unit: DurationSentryMeasurementUnit.milliSecond);
       ttidSpan?.finish(endTimestamp: approximationEndTimestamp!);
+      print('finished already');
     });
   }
 
@@ -276,17 +277,29 @@ class SentryNavigatorObserver extends RouteObserver<PageRoute<dynamic>> {
       return;
     }
 
-    startTime = DateTime.now();
-    ttidSpan = _transaction2?.startChild('ui.load.initial_display', description: '$name initial display');
-    ttidSpan?.origin = 'auto.ui.time_to_display';
+    if (name == 'root ("/")') {
+      // root ttid spans have to align with app start
+      // so the ttid instrumentation needs to be different here.
+      startTime = DateTime.now();
+      ttidSpan = _transaction2?.startChild('ui.load.initial_display', description: '$name initial display', startTimestamp: startTime);
+      ttidSpan?.origin = 'auto.ui.time_to_display';
+    } else {
+      startTime = DateTime.now();
+      ttidSpan = _transaction2?.startChild('ui.load.initial_display', description: '$name initial display', startTimestamp: startTime);
+      ttidSpan?.origin = 'auto.ui.time_to_display';
+    }
 
     // TODO: Needs to finish max within 30 seconds
     // If timeout exceeds then it will finish with status deadline exceeded
     // What to do if root also has TTFD but it's not finished yet and we start navigating to another?
     // How to track the time that 30 sec have passed?
+    //
+    // temporarily disable ttfd for root since it somehow swallows other spans
+    // e.g the complex operation span in autoclosescreen
     if ((_hub.options as SentryFlutterOptions).enableTimeToFullDisplayTracing && name != 'root ("/")') {
       ttfdStopwatch = Stopwatch()..start();
-      ttfdSpan = _transaction2?.startChild('ui.load.full_display', description: '$name full display');
+      ttfdStartTime = DateTime.now();
+      ttfdSpan = _transaction2?.startChild('ui.load.full_display', description: '$name full display', startTimestamp: ttfdStartTime);
     }
 
     if (arguments != null) {

flutter/lib/src/sentry_flutter.dart

@@ -235,25 +235,20 @@ mixin SentryFlutter {
     if (!SentryDisplayTracker().reportManual(routeName)) {
       SentryNavigatorObserver.transaction2?.setMeasurement(
           'time_to_initial_display',
-          endTime.millisecond - SentryNavigatorObserver.startTime.millisecond,
+          endTime.millisecondsSinceEpoch - SentryNavigatorObserver.startTime.millisecondsSinceEpoch,
           unit: DurationSentryMeasurementUnit.milliSecond);
-
-      SentryNavigatorObserver.ttidSpan?.setTag('measurement', 'manual');
       SentryNavigatorObserver.ttidSpan?.finish(endTimestamp: endTime);
     }
   }
 
   /// Reports the time it took for the screen to be fully displayed.
   static void reportFullDisplay() {
-    if (SentryNavigatorObserver.ttfdStopwatch?.elapsedMilliseconds != null) {
-      SentryNavigatorObserver.ttfdStopwatch?.stop();
-      SentryNavigatorObserver.ttfdSpan?.setMeasurement(
-          'time_to_full_display',
-          SentryNavigatorObserver.ttfdStopwatch!.elapsedMilliseconds,
-          unit: DurationSentryMeasurementUnit.milliSecond);
-      SentryNavigatorObserver.ttfdStopwatch?.reset();
-    }
-    SentryNavigatorObserver.ttfdSpan?.finish();
+    final endTime = DateTime.now();
+    SentryNavigatorObserver.ttfdSpan?.setMeasurement(
+        'time_to_full_display',
+        endTime.millisecondsSinceEpoch - SentryNavigatorObserver.ttfdStartTime.millisecondsSinceEpoch,
+        unit: DurationSentryMeasurementUnit.milliSecond);
+    SentryNavigatorObserver.ttfdSpan?.finish(endTimestamp: endTime);
   }
 
   @internal

flutter/lib/src/sentry_flutter_options.dart

@@ -223,7 +223,7 @@ class SentryFlutterOptions extends SentryOptions {
   /// Read timeout. This will only be synced to the Android native SDK.
   Duration readTimeout = Duration(seconds: 5);
 
-  /// Enable or disable the tracing of time to full display.
+  /// Enable or disable the tracing of time to full display (TTFD).
   /// This feature requires using the [Routing Instrumentation](https://docs.sentry.io/platforms/flutter/integrations/routing-instrumentation/).
   bool enableTimeToFullDisplayTracing = false;