Quickstart-unity: FirebaseDatabase broken in Unity 2017.2.0b8 .NET 4.6

[ItsLeeOwen]

Enabling .NET 4.6 Player runtime in Unity 2017.2 beta breaks the Firebase Unity SDK 4.1.0. FirebaseDatabase transactions no longer successfully result in either an error or response object.

To reproduce:

• download the latest 2017.2.0b8 beta https://unity3d.com/unity/beta
• enable the .NET 4.6 Player runtime
• clone & run the Firebase quickstart testapp
• try either the Parse/Plugins/Unity.tasks dll or Parse/Pugins/dotNet45/Unity.tasks dll
• run the project in the editor, enter an email and observe the transaction does not complete

Expected Result:

• the RunTransaction task handler to log either an error, or the success message.

Actual Outcome:

• the application does not proceed further than logging "Running Transaction"

More info: https://forum.unity3d.com/threads/unity-2017-net-4-6-firebase-scripting-runtime-websocket-errors.476078/

[stewartmiles]

With Unity 2017.1.0f1 on OSX with Firebase Unity SDK 4.1.0 the sample works fine for me.

Parse/Plugins/Unity.tasks dll will not work with the .NET 4.6 runtime as it duplicates the implementation of System.Tasks.

You need to use Parse/Pugins/dotNet45/Unity.tasks dll which forwards the implementation to the .NET runtime libraries.

Perhaps you're testing on a different platform?

[ItsLeeOwen]

@stewartmiles I'm on OSX with Unity 2017.2.0b8. I removed + reimported Unity SDK 4.1.0 FirebaseDatabase.unitypackage within quickstart-unity/database/testapp, without luck, the transaction still does not complete. I'll try downgrading to Unity 2017.1.0f1

[stewartmiles]

@ItsLeeOwen could you verify that you're seeing a valid database URL?
https://github.com/firebase/quickstart-unity/blob/master/database/testapp/Assets/TestApp/UIHandler.cs#L71

If this is not set to a valid URL transactions will not complete.

Cheers,
Stewart

[ItsLeeOwen]

@stewartmiles yes, I verified by testing the .NET 35 setting, which successfully wrote to my firebase uri

[ItsLeeOwen]

Unity 2017.1.0f3 works with .NET 4.6. Updating the issue title to specify Unity 2017.2 beta

[patrickhoh]

@ItsLeeOwen thank you for the report. We could reproduce the issue and tracked it to a regression in Unity.

Calling SslStream.AuthenticateAsClient raises a DllNotFoundException. This seems specific to Unity 2017.2.0 .NET 4.6 on macOS. We reported it to Unity, who could reproduce it, see: https://fogbugz.unity3d.com/default.asp?946207_prs3gppf9ssb5t2d . Unfortunately I don't see any workaround that we could implement while we wait for Unity to fix the regression on their side.

Also, the issue seems specific to _macOS_, so FirebaseDatabase should work on all other platforms (including iOS) even with Unity 2017.2.0 .NET 4.6.

[patrickhoh]

Update: Unity fixed this in 2017.3
I tested it with 2017.3.0b6 on macOS and FirebaseDatabase works as expected.
2017.2.0f2 is still broken and I don't know if Unity will ever back-port their fix.

[johnb003]

We fixed some spotty .NET 4.6 issues with 2017 regarding whether or not to use a work-around.
https://firebase.google.com/support/release-notes/unity#4.4.3

Try our new release of Firebase Unity 4.4.3