tgc-revival: set the value to unknown for required fields missing in cais (#15993)

Author: zli82016

mmv1/products/alloydb/Cluster.yaml

@@ -59,7 +59,6 @@ custom_code:
   pre_create: 'templates/terraform/pre_create/alloydb_cluster.go.tmpl'
   pre_update: 'templates/terraform/pre_update/alloydb_cluster.go.tmpl'
   pre_delete: 'templates/terraform/pre_delete/alloydb_cluster.go.tmpl'
-  tgc_decoder: 'templates/tgc_next/decoders/alloydb_cluster.go.tmpl'
 # Skipping the sweeper because we need to force-delete clusters.
 exclude_sweeper: true
 include_in_tgc_next: true

mmv1/products/compute/Image.yaml

@@ -58,7 +58,6 @@ iam_policy:
 include_in_tgc_next: true
 tgc_include_handwritten_tests: true
 custom_code:
-  tgc_decoder: 'templates/tgc_next/decoders/compute_image.go.tmpl'
 examples:
   - name: 'image_basic'
     primary_resource_id: 'example'

mmv1/products/compute/RegionSslCertificate.yaml

@@ -51,7 +51,6 @@ async:
     resource_inside_response: false
 collection_url_key: 'items'
 custom_code:
-  tgc_decoder: 'templates/tgc_next/custom_expand/region_ssl_certificate_decoder.go.tmpl'
   extra_schema_entry: 'templates/terraform/extra_schema_entry/ssl_certificate.tmpl'
   constants: 'templates/terraform/constants/compute_certificate.go.tmpl'
 examples:

mmv1/products/netapp/ActiveDirectory.yaml

@@ -43,7 +43,6 @@ async:
   result:
     resource_inside_response: false
 custom_code:
-  tgc_decoder: 'templates/tgc_next/decoders/netapp_active_directory.go.tmpl'
 # Skipping the sweeper since we need to sweep multiple regions
 exclude_sweeper: true
 examples:

mmv1/templates/terraform/flatten_property_method.go.tmpl

@@ -24,7 +24,7 @@ func flatten{{$.GetPrefix}}{{$.TitlelizeProperty}}(v interface{}, d *schema.Reso
   if v == nil {
     return nil
   }
-    {{- if not $.AllowEmptyObject }}
+    {{- if and (not $.AllowEmptyObject) (not $.ResourceMetadata.IsTgcCompiler) }}
   original := v.(map[string]interface{})
   if len(original) == 0 {
     return nil
@@ -165,6 +165,15 @@ func flatten{{$.GetPrefix}}{{$.TitlelizeProperty}}(v interface{}, d *schema.Reso
 		return false
 	}
 	return v
+  {{- else if and ($.ResourceMetadata.IsTgcCompiler) ($.IsA "String") ($.Required) }}
+	if v == nil {
+		return "unknown"
+	}
+	transformed := v.(string)
+	if transformed == "" {
+		return "unknown"
+	}
+	return v
   {{- else }}
   return v
 {{- end }}

mmv1/templates/tgc_next/custom_expand/region_ssl_certificate_decoder.go.tmpl

@@ -1,11 +1,8 @@
 // These fields are missing in CAI assets, but requried in Terraform
-if saml, ok := res["saml"].(map[string]interface{}); ok {
-	saml["idpMetadataXml"] = "unknown"
-}
-
 if x509, ok := res["x509"].(map[string]interface{}); ok {
 	if trustStore, ok := x509["trustStore"].(map[string]interface{}); ok {
 		if trustAnchors, ok := trustStore["trustAnchors"].([]interface{}); ok {
+			// trust_anchors is missing in CAI assets, but requried in Terraform
 			for _, trustAnchorRaw := range trustAnchors {
 				if trustAnchor, ok := trustAnchorRaw.(map[string]interface{}); ok {
 					trustAnchor["pemCertificate"] = "hidden"