Revert "tgc-revival: Set the fields to state and then read state to hcl data during cai2hcl" (#15999)

Author: zli82016

mmv1/products/compute/BackendService.yaml

@@ -55,6 +55,7 @@ custom_code:
   decoder: 'templates/terraform/decoders/backend_service.go.tmpl'
   post_create: 'templates/terraform/post_create/compute_backend_service_security_policy.go.tmpl'
   post_update: 'templates/terraform/post_create/compute_backend_service_security_policy.go.tmpl'
+  tgc_decoder: 'templates/tgc_next/decoders/compute_backend_service.go.tmpl'
 schema_version: 1
 examples:
   - name: 'backend_service_basic'

mmv1/templates/tgc_next/cai2hcl/resource_converter.go.tmpl

@@ -143,6 +143,9 @@ func (c *{{ $.ResourceName -}}Cai2hclConverter) convertResourceData(asset caiass
 	}
 {{ end}}
 
+{{/* Attempt to parse all self-link parameters from asset name. */}}
+	outputFields := {{ $.OutputFieldSetStr }}
+	utils.ParseUrlParamValuesFromAssetName(asset.Name, "{{ $.Cai2hclAssetNameTemplate }}", outputFields, hclData)
 {{ range $prop := $.ReadPropertiesForTgc }}
 	{{ if $prop.FlattenObject -}}
 	if flattenedProp := flatten{{ if $.NestedQuery -}}Nested{{end}}{{ $.ResourceName -}}{{ camelize $prop.Name "upper"  -}}(res["{{ $prop.ApiName -}}"], d, config); flattenedProp != nil {
@@ -151,22 +154,10 @@ func (c *{{ $.ResourceName -}}Cai2hclConverter) convertResourceData(asset caiass
 		}
 	}
 	{{- else -}}
-    if err := d.Set("{{ underscore $prop.Name -}}", flatten{{ if $.NestedQuery -}}Nested{{end}}{{ $.ResourceName -}}{{ camelize $prop.Name "upper" -}}(res["{{ $prop.ApiName -}}"], d, config)); err != nil {
-        return nil, fmt.Errorf("Error reading {{ $.Name -}}: %s", err)
-    }
+	hclData["{{ underscore $prop.Name -}}"] = flatten{{ if $.NestedQuery -}}Nested{{end}}{{ $.ResourceName -}}{{ camelize $prop.Name "upper" -}}(res["{{ $prop.ApiName -}}"], d, config)
 	{{- end}}
 {{- end}}
 
-	for key, sch := range c.schema {
-		if val, ok := d.GetOk(key); ok || sch.Required {
-			hclData[key] = val
-		}
-	}
-
-{{/* Attempt to parse all self-link parameters from asset name. */}}
-	outputFields := {{ $.OutputFieldSetStr }}
-	utils.ParseUrlParamValuesFromAssetName(asset.Name, "{{ $.Cai2hclAssetNameTemplate }}", outputFields, hclData)
-
 	ctyVal, err := utils.MapToCtyValWithSchema(hclData, c.schema)
 	if err != nil {
 		return nil, err

mmv1/templates/tgc_next/decoders/cloud_asset_feed.go.tmpl

@@ -1,4 +1,4 @@
 // billing_project is the required url_param_only property, but is not in CAI asset name or data
 // TODO: handle it in a generic way
-d.Set("billing_project", "null")
+hclData["billing_project"] = "null"
 return res, hclData, nil

mmv1/templates/tgc_next/decoders/compute_backend_service.go.tmpl

@@ -0,0 +1,31 @@
+{{/*
+	The license inside this block applies to this file
+	Copyright 2025 Google Inc.
+	Licensed under the Apache License, Version 2.0 (the "License");
+	you may not use this file except in compliance with the License.
+	You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
+	Unless required by applicable law or agreed to in writing, software
+	distributed under the License is distributed on an "AS IS" BASIS,
+	WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+	See the License for the specific language governing permissions and
+	limitations under the License.
+*/ -}}
+
+if v, ok := res["backends"]; ok {
+	backends := v.([]interface{})
+	for _, vBackend := range backends {
+        backend := vBackend.(map[string]interface{})
+		if vCms, ok := backend["customMetrics"]; ok {
+			cms := vCms.([]interface{})
+			for _, vCm := range cms {
+                cm := vCm.(map[string]interface{})
+				if vMu, ok := cm["maxUtilization"]; ok {
+					mu := vMu.(float64)
+					cm["maxUtilization"] = fmt.Sprintf("%.1f", mu)
+				}
+			}
+		}
+	}
+}
+
+return res, hclData, nil

mmv1/templates/tgc_next/decoders/compute_route.tmpl

@@ -1,3 +1,12 @@
+if v, ok := res["nextHopInstance"]; ok {
+		val, err := tpgresource.ParseZonalFieldValue("instances", v.(string), "project", "next_hop_instance_zone", d, meta.(*transport_tpg.Config), true)
+		if err != nil {
+				return nil, nil, err
+		}
+		hclData["next_hop_instance_zone"] = val.Zone
+		res["nextHopInstance"] = val.RelativeLink()
+}
+
 // next_hop_ip is Computed + Optional and conflict with next_hop_ilb
 if _, ok := res["nextHopIp"]; ok {
 	if _, ok := res["nextHopIlb"]; ok {