Refactor keys and queries in datastore service and implementation.

filter/dscache/dscache.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 dscache
 
 import (
         "bytes"
         "crypto/sha1"
         "encoding/base64"
@@ skipping 83 matching lines @@
 // FlagValue is used to indicate if a memcache entry currently contains an
 // item or a lock.
 type FlagValue uint32
 
 const (
         ItemUKNONWN FlagValue = iota
         ItemHasData
         ItemHasLock
 )
 
-func MakeMemcacheKey(shard int, k datastore.Key) string {
+func MakeMemcacheKey(shard int, k *datastore.Key) string {
         return fmt.Sprintf(KeyFormat, shard, HashKey(k))
 }
 
-func HashKey(k datastore.Key) string {
+func HashKey(k *datastore.Key) string {
         dgst := sha1.Sum(serialize.ToBytes(k))
         buf := bytes.Buffer{}
         enc := base64.NewEncoder(base64.StdEncoding, &buf)
         _, _ = enc.Write(dgst[:])
         enc.Close()
         return buf.String()[:buf.Len()-Sha1B64Padding]
 }