Spanner Emulator, CallInvoker is set, contrary to use of EmulatorDetection.EmulatorOnly

Hi

I would like to use Spanner Emulator for integration tests but when I use it with C# I get CallInvoker is set error. The below is step by step to produce the error also I am attaching the simple code I have written in C#.

// for some reason C# doesn't find the environment variable so setting it manually
       Environment.SetEnvironmentVariable("SPANNER_EMULATOR_HOST", "localhost:9010");
           
           string projectId = "project-local-emulator";
           string instanceId = "test-instance";

           var builder = new SpannerConnectionStringBuilder
           {
               DataSource = $"projects/{projectId}/instances/{instanceId}",
               EmulatorDetection = EmulatorDetection.EmulatorOnly,
           };

           await using var connection = new SpannerConnection(builder);

           string createStatement = $"CREATE DATABASE `test-db`";
           var cmdcreate = connection.CreateDdlCommand(createStatement);
           await cmdcreate.ExecuteNonQueryAsync();

Environment details

• OS: Mac OSX
• .NET Core 3.1

Steps to reproduce

1. Followed the instruction on this page: https://cloud.google.com/spanner/docs/emulator
2. Created an instance and a database
3. Trying to connect to the spanner emulator via C# and I am getting the following error

System.InvalidOperationException: CallInvoker is set, contrary to use of EmulatorDetection.EmulatorOnly

System.InvalidOperationException CallInvoker is set, contrary to use of EmulatorDetection.EmulatorOnly at Google.Api.Gax.GaxPreconditions.CheckState[T1,T2,T3](Boolean condition, String format, T1 arg0, T2 arg1, T3 arg2) at Google.Api.Gax.Grpc.ClientBuilderBase1.GetEmulatorEnvironment(IEnumerable1 requiredEmulatorEnvironmentVariables, IEnumerable1 allEmulatorEnvironmentVariables, Func2 environmentVariableProvider) at Google.Cloud.Spanner.Admin.Database.V1.DatabaseAdminClientBuilder.MaybeCreateEmulatorClientBuilder() at Google.Cloud.Spanner.Admin.Database.V1.DatabaseAdminClientBuilder.InterceptBuild(DatabaseAdminClient& client) at Google.Cloud.Spanner.Admin.Database.V1.DatabaseAdminClientBuilder.Build() at Google.Cloud.Spanner.Data.SpannerCommand.ExecutableCommand.ExecuteDdlAsync(CancellationToken cancellationToken) at Google.Cloud.Spanner.Data.SpannerCommand.ExecutableCommand.ExecuteDdlAsync(CancellationToken cancellationToken)

Would appreciate your help, as the error above doesn’t really tell much what is wrong!

[jskeet]

This has now been released as part of the 3.3.0 set of libraries.

[jskeet]

Hmmm… that’s definitely not what I’d expect. Will try to look into it this afternoon, but it may be Monday before I can get to it.