Tctl dataconverter plugin

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1

I have a custom data converter that does the encryption/decryption of the payload. So in the WebUI, this shows up as encrypted.

Let me know if my understanding

  • tctl dataconverter web --web-uri xxx
  • Would open up a web socket and when the user goes to the given URL it will attempt to use it’s local data converter to modify the payload
  • Plugins for this need to be written in golang

Here is the PR that implemented this originally using hashicorps plugin framework. https://github.com/temporalio/temporal/pull/1437

I would need to do something similar to https://github.com/temporalio/temporal/blob/master/cmd/tools/cli/plugins/authorization/main.go but for the DataConverter plugin interface.

Do you have any examples of a DataConverter plugin for the CLI? Can this be written in anything other than golang.

2

https://github.com/temporalio/samples-go/tree/main/encryption and https://github.com/temporalio/samples-go/tree/main/snappycompress have tctl plugin implementations.

I don’t believe so currently. However, a RemoteDataConverter that uses IPC or similar has been discussed for such a use case.

3

Plugins do unfortunately need to be Golang for now. I am working on providing a language agnostic interface for this functionality, but I don’t have a timeline for that.

4

Since you are using the go-plugin from hashicorp which is just grpc and allows it being written in other languages. What portion of your implementation is restricting it to golang?

5

We don’t use the gRPC version of the plugin system. go-plugin offers two versions, one based on net/rpc which is golang specific, and one using gRPC. We currently use the former.