ProtoPromise: Methods to troubleshoot UnobservedPromiseException

Hi Tim and friends,

I’m getting a UnobservedPromiseException show up a minute or two after I’ve stopped Unity when GC catches up. This means I have zero info on where or why my code is not resolving a deferred promise.

Is there any way to have PROMISE_DEBUG record the top of stack trace when a deferred promise is created? Another idea would be to allow a debug label (string) to be attached to a promise. In non-debug mode, the string is just dropped and not part of a promise struct, but in debug mode it would travel around with the promise allowing the developer to see its origin.

Drew

About this issue

Original URL
State: closed
Created 8 months ago
Comments: 24 (16 by maintainers)

Most upvoted comments

Aha, looks like it was fixed in #306! To confirm, I added a try/catch:

try
{
    await Promise.SwitchToForeground();
}
catch (Exception e)
{
    Debug.LogException(e);
}

And that actually logs InvalidOperationException: SynchronizationOption.Foreground was provided, but Promise.Config.ForegroundContext was null. You should set Promise.Config.ForegroundContext at the start of your application (which may be as simple as 'Promise.Config.ForegroundContext = SynchronizationContext.Current;').

@drew-512 If you try latest master, it should be fixed. Thank you very much for the bug report, and please let me know if you hit any other issues!

timcassell on Dec 11, 2023