grpc unity iOS: crash at Grpc.Core.Internal.PlatformApis.GetUnityRuntimePlatform on start up

[umegaya]

What version of gRPC and what language are you using?

grpc_unity_package.1.22.0-dev.zip from daily build page.

What operating system (Linux, Windows,...) and version?

osx 10.14.4

What runtime / compiler are you using (e.g. python version or version of gcc)

Unity 2018.4.0f1

What did you do?

https://github.com/umegaya/mobile-game-http-latency-test/blob/master/client/Assets/Scripts/PingRunner.cs#L94

basically just try to invoke simple unary async call. note that android build from same codes run without any error.

What did you expect to see?

ios build can invoke unary call without error, as android version can.

What did you see instead?

error on creating channel object.

NullReferenceException: Object reference not set to an instance of an object.
  at Grpc.Core.Internal.PlatformApis.GetUnityRuntimePlatform () [0x00000] in <00000000000000000000000000000000>:0 
  at Grpc.Core.Internal.NativeExtension.LoadNativeMethodsUnity () [0x00000] in <00000000000000000000000000000000>:0 
  at Grpc.Core.Internal.NativeExtension..ctor () [0x00000] in <00000000000000000000000000000000>:0 
  at Grpc.Core.Internal.NativeExtension.Get () [0x00000] in <00000000000000000000000000000000>:0 
  at Grpc.Core.Internal.NativeMethods.Get () [0x00000] in <00000000000000000000000000000000>:0 
  at Grpc.Core.GrpcEnvironment.GrpcNativeInit () [0x00000] in <00000000000000000000000000000000>:0 
  at Grpc.Core.GrpcEnvironment..ctor () [0x00000] in <00000000000000000000000000000000>:0 
  at Grpc.Core.GrpcEnvironment.AddRef () [0x00000] in <00000000000000000000000000000000>:0 
  at Grpc.Core.Channel..ctor (System.String target, Grpc.Core.ChannelCredentials credentials, System.Collections.Generic.IEnumerable`1[T] options) [0x00000] in <00000000000000000000000000000000>:0 
  at LatencyResearch.GrpcPing..ctor (System.String domain, System.String iaas) [0x00000] in <00000000000000000000000000000000>:0 
  at LatencyResearch.Measure+<Exec>d__4.MoveNext () [0x00000] in <00000000000000000000000000000000>:0 
  at UnityEngine.SetupCoroutine.InvokeMoveNext (System.Collections.IEnumerator enumerator, System.IntPtr returnValueAddress) [0x00000] in <00000000000000000000000000000000>:0 

Anything else we should know about your project / environment?

• I try .Net standard 2.0 and .Net 4.x for Api Compatibility Level, but both crashed same place
• TROUBLESHOOTING.md does not works because error is happen before entering code c library.

[jtattermusch]

This seems to be what's crashing:

grpc/src/csharp/Grpc.Core/Internal/PlatformApis.cs

Line 171 in 2780136

public static string GetUnityRuntimePlatform()

I'm wondering why, the UnityEngine.Application.platform is not really something that could be missing in a working unity application.
https://docs.unity3d.com/ScriptReference/Application-platform.html

[stale]

This issue/PR has been automatically marked as stale because it has not had any update (including commits, comments, labels, milestones, etc) for 180 days. It will be closed automatically if no further update occurs in 1 day. Thank you for your contributions!

[blunoob]

I am still getting the same error on Unity 2019.2.6f1 when building for android with il2cpp. Is there any chance that the problem is not there in MagicOnion library?

I/Unity: >> e.Message >> Object reference not set to an instance of an object.
Exception : at Grpc.Core.Internal.PlatformApis.GetUnityRuntimePlatform () [0x00000] in <00000000000000000000000000000000>:0
at Grpc.Core.Internal.NativeExtension.LoadNativeMethodsUnity () [0x00000] in <00000000000000000000000000000000>:0
at Grpc.Core.Internal.NativeExtension..ctor () [0x00000] in <00000000000000000000000000000000>:0
at Grpc.Core.Internal.NativeExtension.Get () [0x00000] in <00000000000000000000000000000000>:0
at Grpc.Core.Internal.NativeMethods.Get () [0x00000] in <00000000000000000000000000000000>:0
at Grpc.Core.GrpcEnvironment.GrpcNativeInit () [0x00000] in <00000000000000000000000000000000>:0
at Grpc.Core.GrpcEnvironment..ctor () [0x00000] in <00000000000000000000000000000000>:0
at Grpc.Core.GrpcEnvironment.AddRef () [0x00000] in <00000000000000000000000000000000>:0
at Grpc.Core.Channel..ctor (System.String target, Grpc.Core.ChannelCredentials credentials, System.Collections.Generic.IEnume

[blunoob]

The error is now gone. Looks like its fixed in the grpc daily build from yesterday.

[ogswr]

That's good to hear.

[stale]

This issue/PR has been automatically marked as stale because it has not had any update (including commits, comments, labels, milestones, etc) for 30 days. It will be closed automatically if no further update occurs in 7 day. Thank you for your contributions!

[ownrisk]

It's seems to IL2CPP-ByteCodeStripping.

add file: /Assets/link.xml

<linker>
    <assembly fullname="UnityEngine">
        <type fullname="UnityEngine.Application" preserve="fields">
            <property name="platform"/>
        </type>
    </assembly>
</linker>

[jtattermusch]

Looks like the workaround #19262 (comment) has been confirmed and this also doesn't seem to be an issue in the grpc code. Closing.