Create a provider from existing go client

Terraform Providers Plugin Development
1

I have an existing client for my SDK written in Go that has all the types of all the resources already defined.
This is a REST API, so all the types are basically unmarshalled JSON

This seems like a rudimentary task but I couldn’t find it anywhere in the docs

Is it possible to derive the schema types of resources and data sources from existing Go types ? I would like to avoid having to maintain multiple schemas of the same API when I already have it defined

2

Hi @omercnet :wave: Thank you for raising this topic and welcome to HashiCorp Discuss.

Is the Go-based SDK based off another definition, such as OpenAPI? If not, parsing the SDK into its Abstract Syntax Tree (AST) is likely required before it can be translated into a Terraform Provider schema definition. Linking various AST concepts together may seem simple on the surface, but there may be a bit of additional nuance to the process that would make it difficult to translate without providing some Terraform-specific configuration along the way. It’s hard to discuss these without knowing the full situation though.

While HashiCorp itself does not provide native tooling for this at the moment, there are plans to support various pieces of code generation functionality which should aid here. A recent presentation from HashiTalks: Build goes into more details: https://www.youtube.com/watch?v=pAeQC0fC3Xw&list=PL81sUbsFNc5acsh5-S83W3sz6qhG7CT7z&index=3&ab_channel=HashiCorp

3

yes, it’s based on protobuf, with a solid openapi schema
I understand you’re still working on this - would love to participate in the early experiments to help us move faster