grpc_headers_test

Repo created to test an issue happening with the await of the headers in a ResponseFuture.

The issue

Per documentations, we should be able to await the headers in any give ResponseFuture call.

However when the call is not implemented, the code hangs indefinetly without completing.

Sample

Usint the following code I espect to always have a print at some point

Future<void> testService() async {
    try {
      final client = MyService.instance.client;
      final request = TestRequest(name: "Test");
      final responseFuture = client.sayHello(request);
    
      var header = await responseFuture.headers; //ISSUE IN THIS LINE
      var helloResponse = await responseFuture;
    
      print(helloResponse.message);
    } catch (e) {
      print(e);
    }
}

But in reality what is happening is that the await responseFuture.headers; never completes, hanging this future indefinitely

This project is created to test this case, it defines a sample proto and it already include the generated file for convenience inside lib/services it includes a Simple application that shows a button to call the service and await for the result.

How to test

1. Clone this repo
2. On the root directory run the project, by using flutter run on the console for your device of choice
3. Tap on the Send request button.

Expected result

A loader is briefly shown, then a error is shown in the text over the button indicating the service is not available.

Actual result

The loader never goes away because the var header = await responseFuture.headers; at line 59 of main.dart never completes.

Extra info

Running on web I get the following log, showing that something failed asyncronously but it is not rethrown/catched

Error
dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 329:10  createErrorWithStack
dart-sdk/lib/_internal/js_dev_runtime/patch/core_patch.dart 265:28            _throw
dart-sdk/lib/core/errors.dart 120:5                                           throwWithStackTrace
dart-sdk/lib/async/zone.dart 1386:11                                          callback
dart-sdk/lib/async/schedule_microtask.dart 40:11                              _microtaskLoop
dart-sdk/lib/async/schedule_microtask.dart 49:5                               _startMicrotaskLoop
dart-sdk/lib/_internal/js_dev_runtime/patch/async_patch.dart 181:7            <fn>