Could you provide an example of CloudEventDataConverterAttribute

I have the below simple event function:

open Google.Cloud.Functions.Framework
open Google.Events
open Google.Events.Protobuf.Cloud.PubSub.V1
open System.Threading.Tasks

type Function() =
    interface ICloudEventFunction<PubsubMessage> with
        
        member this.HandleAsync(cloudEvent, data, cancellationToken) =

            printfn "%s" data.TextData

            Task.CompletedTask

When deployed I get the error:

System.InvalidOperationException: Unable to create data converter for target type Google.Events.Protobuf.Cloud.PubSub.V1.PubsubMessage
 ---> System.ArgumentException: Type Google.Events.Protobuf.Cloud.PubSub.V1.PubsubMessage does not have CloudEventDataConverterAttribute applied to it.
   at Google.Events.CloudEventConverters.CreateDataConverter[T]()
   --- End of inner exception stack trace ---
   at Google.Events.CloudEventConverters.CreateDataConverter[T]()
   at System.Collections.Concurrent.ConcurrentDictionary`2.GetOrAdd(TKey key, Func`2 valueFactory)
   at Google.Events.CloudEventConverters.GetDataConverter[T]()
   at Google.Events.CloudEventConverters.ConvertCloudEventData[T](CloudEvent cloudEvent)
   at Google.Cloud.Functions.Framework.CloudEventAdapter`1.HandleAsync(HttpContext context)
   at Google.Cloud.Functions.Hosting.HostingInternals.Execute(HttpContext context)
   at Microsoft.AspNetCore.Builder.Extensions.MapMiddleware.Invoke(HttpContext context)
   at Microsoft.AspNetCore.Builder.Extensions.MapMiddleware.Invoke(HttpContext context)
   at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http.HttpProtocol.ProcessRequests[TContext](IHttpApplication`1 application)

The README says the type in the ICloudEventFunction should have the CloudEventDataConverterAttribute applied to it but I would have thought GCP types would already have this?

Could you give an example of how to apply CloudEventDataConverterAttribute to types?

[jskeet]

@vestigialdev: Yup - sorry for taking too long to work out that’s what you meant. (First coffee of the day hadn’t fully kicked in.)

It turns out there were issues with some other snippets too. I’m fixing those up, and also trying to work out why this wasn’t caught in automated testing. Thanks for spotting it and drawing my attention to it.

[BestDigital22]

Sorry for being unclear- I do mean that the template generated by the Cloud Console (rather than using powershell locally to run dotnet new gcf-event) seems to output a bad Function.cs that doesn’t compile/deploy