Reland: Refactor current GAE abstraction library to be free of the SDK*

go/src/infra/gae/epservice/example/service_currentvalue.go

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 package example
 
 import (
         "golang.org/x/net/context"
-        "infra/gae/libs/wrapper"
-        "infra/gae/libs/wrapper/gae"
+        "infra/gae/libs/gae"
+        "infra/gae/libs/gae/prod"
 
         "github.com/GoogleCloudPlatform/go-endpoints/endpoints"
 )
 
 // CurrentValueReq describes the inputs to the CurrentValueReq RPC.
 type CurrentValueReq struct {
         Name string `endpoints:"required"`
 }
 
 // CurrentValueRsp describes the outputs of the CurrentValueReq RPC.
 type CurrentValueRsp struct {
         Val int64 `json:",string"`
 }
 
 // CurrentValue gets the current value of a counter (duh)
-func (Example) CurrentValue(c endpoints.Context, r *CurrentValueReq) (rsp *CurrentValueRsp, err error) {
-        ds := wrapper.GetDS(gae.Use(context.Background(), c))
+func (Example) CurrentValue(c context.Context, r *CurrentValueReq) (rsp *CurrentValueRsp, err error) {
+        c = prod.Use(c)
+        rds := gae.GetRDS(c)
 
-        ctr := &Counter{ID: r.Name}
-        if err = ds.Get(ctr); err != nil {
+        key := rds.NewKey("Counter", r.Name, 0, nil)
+        ctr := &Counter{}
+        if err = rds.Get(key, ctr); err != nil {
                 return
         }
 
         rsp = &CurrentValueRsp{ctr.Val}
         return
 }
 
 func init() {
         mi["CurrentValue"] = &endpoints.MethodInfo{
                 Path: "counter/{Name}",
                 Desc: "Returns the current value held by the named counter",
         }
 }