token-server: Warmup some local caches in /_ah/warmup.

tokenserver/appengine/impl/certconfig/rpc_list_cas.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 certconfig
 
 import (
         "golang.org/x/net/context"
         "google.golang.org/grpc"
         "google.golang.org/grpc/codes"
 
         "github.com/golang/protobuf/ptypes/empty"
-        ds "github.com/luci/gae/service/datastore"
 
         "github.com/luci/luci-go/tokenserver/api/admin/v1"
 )
 
 // ListCAsRPC implements CertificateAuthorities.ListCAs RPC method.
 type ListCAsRPC struct {
 }
 
 // ListCAs returns a list of Common Names of registered CAs.
 func (r *ListCAsRPC) ListCAs(c context.Context, _ *empty.Empty) (*admin.ListCAsResponse, error) {
-        keys := []*ds.Key{}
-
-        q := ds.NewQuery("CA").Eq("Removed", false).KeysOnly(true)
-        if err := ds.GetAll(c, q, &keys); err != nil {
+        names, err := ListCAs(c)
+        if err != nil {
                 return nil, grpc.Errorf(codes.Internal, "transient datastore error - %s", err)
         }
-
-        resp := &admin.ListCAsResponse{
-                Cn: make([]string, len(keys)),
-        }
-        for i, key := range keys {
-                resp.Cn[i] = key.StringID()
-        }
-        return resp, nil
+        return &admin.ListCAsResponse{Cn: names}, nil
 }