action: Implement error returning for action RPCs (#1522)

* implement RPCs

* add changelog

Author: austinvalle

.changes/unreleased/NOTES-20250916-124728.yaml

@@ -0,0 +1,5 @@
+kind: NOTES
+body: 'helper/schema: Update the provider server to handle Action RPCs by returning an error since they are not supported by SDKv2.'
+time: 2025-09-16T12:47:28.705896-04:00
+custom:
+    Issue: "1522"

helper/schema/grpc_provider.go

@@ -198,6 +198,7 @@ func (s *GRPCProviderServer) GetMetadata(ctx context.Context, req *tfprotov5.Get
 		EphemeralResources: make([]tfprotov5.EphemeralResourceMetadata, 0),
 		Functions:          make([]tfprotov5.FunctionMetadata, 0),
 		ListResources:      make([]tfprotov5.ListResourceMetadata, 0),
+		Actions:            make([]tfprotov5.ActionMetadata, 0),
 		Resources:          make([]tfprotov5.ResourceMetadata, 0, len(s.provider.ResourcesMap)),
 		ServerCapabilities: s.serverCapabilities(),
 	}
@@ -227,6 +228,7 @@ func (s *GRPCProviderServer) GetProviderSchema(ctx context.Context, req *tfproto
 		EphemeralResourceSchemas: make(map[string]*tfprotov5.Schema, 0),
 		Functions:                make(map[string]*tfprotov5.Function, 0),
 		ListResourceSchemas:      make(map[string]*tfprotov5.Schema, 0),
+		ActionSchemas:            make(map[string]*tfprotov5.ActionSchema, 0),
 		ResourceSchemas:          make(map[string]*tfprotov5.Schema, len(s.provider.ResourcesMap)),
 		ServerCapabilities:       s.serverCapabilities(),
 	}
@@ -2065,6 +2067,68 @@ func (s *GRPCProviderServer) ListResource(ctx context.Context, req *tfprotov5.Li
 	return resp, nil
 }
 
+func (s *GRPCProviderServer) ValidateActionConfig(ctx context.Context, req *tfprotov5.ValidateActionConfigRequest) (*tfprotov5.ValidateActionConfigResponse, error) {
+	ctx = logging.InitContext(ctx)
+
+	logging.HelperSchemaTrace(ctx, "Returning error for action type validate")
+
+	resp := &tfprotov5.ValidateActionConfigResponse{
+		Diagnostics: []*tfprotov5.Diagnostic{
+			{
+				Severity: tfprotov5.DiagnosticSeverityError,
+				Summary:  "Unknown Action Type",
+				Detail:   fmt.Sprintf("The %q action type is not supported by this provider.", req.ActionType),
+			},
+		},
+	}
+
+	return resp, nil
+}
+
+func (s *GRPCProviderServer) PlanAction(ctx context.Context, req *tfprotov5.PlanActionRequest) (*tfprotov5.PlanActionResponse, error) {
+	ctx = logging.InitContext(ctx)
+
+	logging.HelperSchemaTrace(ctx, "Returning error for action type plan")
+
+	resp := &tfprotov5.PlanActionResponse{
+		Diagnostics: []*tfprotov5.Diagnostic{
+			{
+				Severity: tfprotov5.DiagnosticSeverityError,
+				Summary:  "Unknown Action Type",
+				Detail:   fmt.Sprintf("The %q action type is not supported by this provider.", req.ActionType),
+			},
+		},
+	}
+
+	return resp, nil
+}
+
+func (s *GRPCProviderServer) InvokeAction(ctx context.Context, req *tfprotov5.InvokeActionRequest) (*tfprotov5.InvokeActionServerStream, error) {
+	ctx = logging.InitContext(ctx)
+
+	logging.HelperSchemaTrace(ctx, "Returning error for action invoke")
+
+	event := make([]tfprotov5.InvokeActionEvent, 0)
+
+	event = append(event, tfprotov5.InvokeActionEvent{
+		Type: tfprotov5.CompletedInvokeActionEventType{
+			Diagnostics: []*tfprotov5.Diagnostic{
+				{
+					Severity: tfprotov5.DiagnosticSeverityError,
+					Summary:  "Unknown Action Type",
+					Detail:   fmt.Sprintf("The %q action type is not supported by this provider.", req.ActionType),
+				},
+			},
+		},
+	})
+
+	resp := &tfprotov5.InvokeActionServerStream{
+		Events: slices.Values(event),
+	}
+
+	return resp, nil
+}
+
 func pathToAttributePath(path cty.Path) *tftypes.AttributePath {
 	var steps []tftypes.AttributePathStep
 

helper/schema/grpc_provider_test.go

@@ -3763,6 +3763,7 @@ func TestGRPCProviderServerGetMetadata(t *testing.T) {
 				Functions:          []tfprotov5.FunctionMetadata{},
 				EphemeralResources: []tfprotov5.EphemeralResourceMetadata{},
 				ListResources:      []tfprotov5.ListResourceMetadata{},
+				Actions:            []tfprotov5.ActionMetadata{},
 				Resources:          []tfprotov5.ResourceMetadata{},
 				ServerCapabilities: &tfprotov5.ServerCapabilities{
 					GetProviderSchemaOptional: true,
@@ -3792,6 +3793,7 @@ func TestGRPCProviderServerGetMetadata(t *testing.T) {
 				Functions:          []tfprotov5.FunctionMetadata{},
 				EphemeralResources: []tfprotov5.EphemeralResourceMetadata{},
 				ListResources:      []tfprotov5.ListResourceMetadata{},
+				Actions:            []tfprotov5.ActionMetadata{},
 				Resources: []tfprotov5.ResourceMetadata{
 					{
 						TypeName: "test_resource1",
@@ -3817,6 +3819,7 @@ func TestGRPCProviderServerGetMetadata(t *testing.T) {
 				Functions:          []tfprotov5.FunctionMetadata{},
 				EphemeralResources: []tfprotov5.EphemeralResourceMetadata{},
 				ListResources:      []tfprotov5.ListResourceMetadata{},
+				Actions:            []tfprotov5.ActionMetadata{},
 				Resources: []tfprotov5.ResourceMetadata{
 					{
 						TypeName: "test_resource1",