luci_deploy: Enable loading "index.yaml" directly.

deploytool/api/deploy/util.go

 // Copyright 2016 The LUCI Authors. All rights reserved.
 // Use of this source code is governed under the Apache License, Version 2.0
 // that can be found in the LICENSE file.
 
 package deploy
 
 import (
         "fmt"
+
+        "github.com/luci/luci-go/common/errors"
 )
 
 // AppYAMLString returns the "app.yaml" string for this option.
 func (v AppEngineModule_Handler_LoginOption) AppYAMLString() string {
         switch v {
         case AppEngineModule_Handler_LOGIN_OPTIONAL:
                 return "optional"
         case AppEngineModule_Handler_LOGIN_REQUIRED:
                 return "required"
         case AppEngineModule_Handler_LOGIN_ADMIN:
@@ skipping 10 matching lines @@
                 return "optional"
         case AppEngineModule_Handler_SECURE_NEVER:
                 return "never"
         case AppEngineModule_Handler_SECURE_ALWAYS:
                 return "always"
         default:
                 panic(fmt.Errorf("unknown handler secure option %q", v))
         }
 }
 
-// AppYAMLString returns the "app.yaml" string for this option.
+// AppYAMLString returns the "index.yaml" string for this option.
 func (v AppEngineResources_Index_Direction) AppYAMLString() string {
         switch v {
         case AppEngineResources_Index_ASCENDING:
                 return "asc"
         case AppEngineResources_Index_DESCENDING:
                 return "desc"
         default:
                 panic(fmt.Errorf("unknown index direction %q", v))
         }
 }
 
+// IndexDirectionFromAppYAMLString returns the
+// AppEngineResources_Index_Direction value associated with the given
+// "index.yaml" strnig value.
+//
+// This is a reverse of the AppEngineResources_Index_Direction's AppYAMLString.
+//
+// If the direction value is not recognized, an error will be returned.
+func IndexDirectionFromAppYAMLString(v string) (AppEngineResources_Index_Direction, error) {
+        switch v {
+        case "asc", "":
+                return AppEngineResources_Index_ASCENDING, nil
+
+        case "desc":
+                return AppEngineResources_Index_DESCENDING, nil
+
+        default:
+                return 0, errors.Reason("invalid index direction %(value)q").D("value", v).Err()
+        }
+}
+
 // KubeString returns the Kubernetes "restartPolicy" field string for the
 // enumeration value.
 func (v KubernetesPod_RestartPolicy) KubeString() string {
         switch v {
         case KubernetesPod_RESTART_ALWAYS:
                 return "Always"
         case KubernetesPod_RESTART_ON_FAILURE:
                 return "OnFailure"
         case KubernetesPod_RESTART_NEVER:
                 return "Never"
@@ skipping 32 matching lines @@
                 return "Ti"
         case KubernetesPod_Container_Resources_PEBIBYTE:
                 return "Pi"
         case KubernetesPod_Container_Resources_EXBIBYTE:
                 return "Ei"
 
         default:
                 panic(fmt.Errorf("unknown resource unit (%v)", v))
         }
 }