[milo] {buildbucket,buildbot,swarming,logdog} -> backends/*.

milo/appengine/buildbot/datastore.go

Index: milo/appengine/buildbot/datastore.go
diff --git a/milo/appengine/buildbot/datastore.go b/milo/appengine/buildbot/datastore.go
deleted file mode 100644
index cb45a4e7fd1a2c983e1c549c366ae6cd287da3e3..0000000000000000000000000000000000000000
--- a/milo/appengine/buildbot/datastore.go
+++ /dev/null
@@ -1,55 +0,0 @@
-// 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 (
-	"github.com/luci/gae/service/datastore"
-
-	"golang.org/x/net/context"
-)
-
-// buildQueryBatchSize is the batch size to use when querying build. It is
-// employed as an upper bound by getBuildQueryBatcher.
-//
-// This should be tuned to the observed query timeout for build loading. Since
-// loading is CPU-bound, this will probably be low. If build queries start
-// encountering datastore timeouts, reduce this value.
-const buildQueryBatchSize = 50
-
-// getBuildQueryBatcher returns a datastore.Batcher tuned for executing queries on the
-// "buildbotBuild" entity.
-func getBuildQueryBatcher(c context.Context) *datastore.Batcher {
-	constraints := datastore.Raw(c).Constraints()
-	if constraints.QueryBatchSize > buildQueryBatchSize {
-		constraints.QueryBatchSize = buildQueryBatchSize
-	}
-	return &datastore.Batcher{
-		Size: constraints.QueryBatchSize,
-	}
-}
-
-// runBuildsQuery takes a buildbotBuild query and returns a list of builds
-// along with a cursor.  We pass the limit here and apply it to the query as
-// an optimization because then we can create a build container of that size.
-func runBuildsQuery(c context.Context, q *datastore.Query, limit int32) (
-	[]*buildbotBuild, *datastore.Cursor, error) {
-
-	if limit != 0 {
-		q = q.Limit(limit)
-	}
-	builds := make([]*buildbotBuild, 0, limit)
-	var nextCursor *datastore.Cursor
-	err := getBuildQueryBatcher(c).Run(
-		c, q, func(build *buildbotBuild, getCursor datastore.CursorCB) error {
-			builds = append(builds, build)
-			tmpCursor, err := getCursor()
-			if err != nil {
-				return err
-			}
-			nextCursor = &tmpCursor
-			return nil
-		})
-	return builds, nextCursor, err
-}