Làm thế nào để có được những dấu vết ngăn xếp đầy đủ cho async thực hiện

Question

Đối với một ví dụ nhỏ như

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!'; 
} 

tôi nhận được vết đống này. Xa nhất tôi có thể theo dõi cuộc gọi trở lại là cuộc gọi runAsync() trong scheduleAsync(). Không có thông tin còn lại, rằng scheduleAsync được gọi từ 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 

Có cách nào để nhận dấu vết ngăn xếp đầy đủ không?

Answer 1

Gói stack_tracehttps://pub.dartlang.org/packages/stack_trace tổng hợp toàn bộ dấu vết ngăn xếp.

Xem thêm
- this blog post từ nhà phát triển gói stack_trace.
- 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!'; 
} 

sản xuất sản lượng này cho phép theo dõi lại cho dòng đầu tiên trong 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 

Thậm chí hữu ích hơn là phiên bản ngắn gọn

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!'; 
} 

trong đó sản xuất:

 
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