Use a datastore batcher for build queries.

milo/appengine/buildbot/builder.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 buildbot
 
 import (
         "fmt"
         "net/http"
         "sort"
@@ skipping 49 matching lines @@
         result := []*resp.BuildSummary{}
         q := ds.NewQuery("buildbotBuild")
         q = q.Eq("finished", finished)
         q = q.Eq("master", masterName)
         q = q.Eq("builder", builderName)
         if limit != 0 {
                 q = q.Limit(int32(limit))
         }
         q = q.Order("-number")
         buildbots := []*buildbotBuild{}
-        err := ds.GetAll(c, q, &buildbots)
+        err := getBuildQueryBatcher(c).GetAll(c, q, &buildbots)
         if err != nil {
                 return nil, err
         }
         for _, b := range buildbots {
                 result = append(result, getBuildSummary(b))
         }
         return result, nil
 }
 
 var errMasterNotFound = miloerror.Error{
@@ skipping 74 matching lines @@
         }
         result.CurrentBuilds = currentBuilds
 
         for _, fb := range finishedBuilds {
                 if fb != nil {
                         result.FinishedBuilds = append(result.FinishedBuilds, fb)
                 }
         }
         return result, nil
 }