Consider Adding tfprotov5/tfprotov6 Schema* Methods for tftypes.Type Conversion

[bflad]

terraform-plugin-go version

v0.7.1

Use cases

Downstream implementations, whether SDKs or providers, may need to retrieve the tftypes.Type equivalent of tfprotov5/tfprotov6 schema types such as:

• Schema
• SchemaAttribute
• SchemaBlock
• SchemaNestedBlock
• SchemaObject

For example, this is necessary for calling (DynamicValue).Unmarshal(), which is necessary for data handling of ApplyResourceChange and other RPCs.

Attempted solutions

Manually (re-)implementing this logic downstream.

Proposal

Implement methods such as the following:

// package tfprotov5
func (s *Schema) Type() tftypes.Type { /* ... */ }
func (s *SchemaAttribute) Type() tftypes.Type { /* ... */ }
func (s *SchemaBlock) Type() tftypes.Type { /* ... */ }
func (s *SchemaNestedBlock) Type() tftypes.Type { /* ... */ }

// package tfprotov6
func (s *Schema) Type() tftypes.Type { /* ... */ }
func (s *SchemaAttribute) Type() tftypes.Type { /* ... */ }
func (s *SchemaBlock) Type() tftypes.Type { /* ... */ }
func (s *SchemaNestedBlock) Type() tftypes.Type { /* ... */ }
func (s *SchemaObject) Type() tftypes.Type { /* ... */ }

With associated unit testing.

References

• https://github.com/hashicorp/terraform-provider-kubernetes/blob/56acec127449eaf20d538c1ad2a6194790410dff/manifest/provider/provider.go#L10-L40
• Introduce equality checking of PreparedConfig in PrepareProviderConfig and ValidateProviderConfig terraform-plugin-mux#54

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