Use a datastore batcher for build queries.

milo/appengine/buildbot/console.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"
         "strings"
 
@@ skipping 10 matching lines @@
 func getFullBuilds(c context.Context, masterName, builderName string, finished bool) ([]*buildbotBuild, error) {
         // TODO(hinoka): Builder specific structs.
         q := ds.NewQuery("buildbotBuild")
         q = q.Eq("finished", finished)
         q = q.Eq("master", masterName)
         q = q.Eq("builder", builderName)
         q = q.Limit(25) // TODO(hinoka): This should be adjustable
         q = q.Order("-number")
         q.Finalize()
         buildbots := make([]*buildbotBuild, 0, 25)
-        err := ds.GetAll(c, q, &buildbots)
+        err := getBuildQueryBatcher(c).GetAll(c, q, &buildbots)
         return buildbots, err
 }
 
 // GetConsoleBuilds takes commits and builders and returns a matrix of
 // resp.ConsoleBuild objects.  The expected format of the result
 // is [len(commits)][len(builders)]*resp.ConsoleBuild.  The first level matches
 // 1:1 to a commit, and the second level matches 1:1 to a builder.
 func GetConsoleBuilds(
         c context.Context, builders []resp.BuilderRef, commits []string) (
         [][]*resp.ConsoleBuild, error) {
@@ skipping 46 matching lines @@
                                 }
                                 log.Debugf(c,
                                         "Builder %s took %s to query, %s to compute.", builderName,
                                         t2.Sub(t1), clock.Since(c, t2))
                                 return nil
                         }
                 }
         })
         return results, err
 }