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For a small example like
import 'dart:async';
import 'package:stack_trace/stack_trace.dart';
void main() {
scheduleAsync();
}
void scheduleAsync() {
new Future.delayed(new Duration(seconds: 1))
.then((_) => runAsync());
}
void runAsync() {
throw 'oh no!';
}
I get this stack trace. The furthest I can trace the call back is the runAsync() call in scheduleAsync().
There is no information left, that scheduleAsync was called from main.
Unhandled exception: Uncaught Error: oh no! Stack Trace: #0 runAsync (file:///home/myuser/dart/playground/bin/stack_trace/main.dart:14:3) #1 scheduleAsync. (file:///home/myuser/dart/playground/bin/stack_trace/main.dart:10:28) #2 _RootZone.runUnary (dart:async/zone.dart:1155) #3 _Future._propagateToListeners.handleValueCallback (dart:async/future_impl.dart:484) #4 _Future._propagateToListeners (dart:async/future_impl.dart:567) #5 _Future._complete (dart:async/future_impl.dart:348) #6 Future.Future.delayed. (dart:async/future.dart:228) #7 Timer._createTimer. (dart:async-patch/timer_patch.dart:16) #8 _Timer._runTimers (dart:isolate-patch/timer_impl.dart:385) #9 _handleMessage (dart:isolate-patch/timer_impl.dart:411) #10 _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:142) #0 _rootHandleUncaughtError. (dart:async/zone.dart:886) #1 _asyncRunCallbackLoop (dart:async/schedule_microtask.dart:41) #2 _asyncRunCallback (dart:async/schedule_microtask.dart:48) #3 _runPendingImmediateCallback (dart:isolate-patch/isolate_patch.dart:96) #4 _Timer._runTimers (dart:isolate-patch/timer_impl.dart:392) #5 _handleMessage (dart:isolate-patch/timer_impl.dart:411) #6 _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:142) Process finished with exit code 255
Is there a way to get the full stack trace?
323
Asynchronous stack traces allow you to inspect function calls beyond the current event loop. This is particularly useful because you can examine the scope of previously executed frames that are no longer on the event loop. This feature is currently an experiment and needs to be enabled.
If the Console view is not visible, go to the menu option Window -> Show View and select Console. and then select Java Stack Trace Console from the drop-down list.
Analyze external stack tracesFrom the main menu, select Code | Analyze Stack Trace or Thread Dump. In the Analyze Stack Trace dialog that opens, paste the external stack trace or thread dump into the Put a stacktrace here: text area. Click OK. The stack trace is displayed in the Run tool window.
A StackTrace is intended to convey information to the user about the call sequence that triggered an exception. These objects are created by the runtime, it is not possible to create them programmatically.
The stack_trace package https://pub.dartlang.org/packages/stack_trace puts together the whole stack trace.
See also
- this blog post from a developer of the stack_trace package.
- http://news.dartlang.org/2016/01/unboxing-packages-stacktrace.html?m=1
import 'dart:async';
import 'package:stack_trace/stack_trace.dart';
void main() {
Chain.capture(() {
scheduleAsync(); // <= pass my code in Chain.capture
}, onError: (error, stack) {
print(error);
print(stack);
});
}
void scheduleAsync() {
new Future.delayed(new Duration(seconds: 1))
.then((_) => runAsync());
}
void runAsync() {
throw 'oh no!';
}
produces this output which allows trace back to the first line in main.
oh no! main.dart 19:3 runAsync main.dart 15:28 scheduleAsync. package:stack_trace/src/stack_zone_specification.dart 134:26 registerUnaryCallback.. package:stack_trace/src/stack_zone_specification.dart 210:15 StackZoneSpecification._run package:stack_trace/src/stack_zone_specification.dart 134:18 registerUnaryCallback. dart:async/zone.dart 902 _rootRunUnary dart:async/zone.dart 804 _CustomZone.runUnary dart:async/future_impl.dart 484 _Future._propagateToListeners.handleValueCallback dart:async/future_impl.dart 567 _Future._propagateToListeners dart:async/future_impl.dart 348 _Future._complete dart:async/future.dart 228 Future.Future.delayed. package:stack_trace/src/stack_zone_specification.dart 210:15 StackZoneSpecification._run package:stack_trace/src/stack_zone_specification.dart 124:52 registerCallback. dart:async/zone.dart 891 _rootRun dart:async/zone.dart 796 _CustomZone.run dart:async/zone.dart 704 _CustomZone.runGuarded dart:async/zone.dart 729 _CustomZone.bindCallback. package:stack_trace/src/stack_zone_specification.dart 210:15 StackZoneSpecification._run package:stack_trace/src/stack_zone_specification.dart 124:52 registerCallback. dart:async/zone.dart 895 _rootRun dart:async/zone.dart 796 _CustomZone.run dart:async/zone.dart 704 _CustomZone.runGuarded dart:async/zone.dart 729 _CustomZone.bindCallback. dart:async-patch/timer_patch.dart 16 Timer._createTimer. dart:isolate-patch/timer_impl.dart 385 _Timer._runTimers dart:isolate-patch/timer_impl.dart 411 _handleMessage dart:isolate-patch/isolate_patch.dart 142 _RawReceivePortImpl._handleMessage ===== asynchronous gap =========================== dart:async/zone.dart 828 _CustomZone.registerUnaryCallback dart:async/future_impl.dart 208 _Future.then main.dart 15:12 scheduleAsync main.dart 6:18 main. package:stack_trace/src/chain.dart 82:24 Chain.capture. dart:async/zone.dart 895 _rootRun dart:async/zone.dart 796 _CustomZone.run dart:async/zone.dart 1251 runZoned package:stack_trace/src/chain.dart 80:20 Chain.capture main.dart 5:16 main dart:isolate-patch/isolate_patch.dart 255 _startIsolate. dart:isolate-patch/isolate_patch.dart 142 _RawReceivePortImpl._handleMessage Process finished with exit code 0
Even more useful is the terse version
import 'dart:async';
import 'package:stack_trace/stack_trace.dart';
void main() {
Chain.capture(() {
scheduleAsync();
}, onError: (error, stack) {
print(error);
print(new Trace.from(stack).terse);
});
}
void scheduleAsync() {
new Future.delayed(new Duration(seconds: 1))
.then((_) => runAsync());
}
void runAsync() {
throw 'oh no!';
}
which produces:
oh no! main.dart 19:3 runAsync main.dart 15:28 scheduleAsync. ===== asynchronous gap =========================== dart:async _Future.then main.dart 15:12 scheduleAsync main.dart 6:18 main. package:stack_trace Chain.capture main.dart 5:16 main Process finished with exit code 0
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