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// Copyright 2015 The LUCI Authors.
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// See the License for the specific language governing permissions and
// limitations under the License.
package count
import (
ds ""
// DSCounter is the counter object for the datastore service.
type DSCounter struct {
AllocateIDs Entry
DecodeCursor Entry
RunInTransaction Entry
Run Entry
Count Entry
DeleteMulti Entry
GetMulti Entry
PutMulti Entry
type dsCounter struct {
c *DSCounter
ds ds.RawInterface
var _ ds.RawInterface = (*dsCounter)(nil)
func (r *dsCounter) AllocateIDs(keys []*ds.Key, cb ds.NewKeyCB) error {
return r.c.AllocateIDs.up(r.ds.AllocateIDs(keys, cb))
func (r *dsCounter) DecodeCursor(s string) (ds.Cursor, error) {
cursor, err := r.ds.DecodeCursor(s)
return cursor, r.c.DecodeCursor.up(err)
func (r *dsCounter) Run(q *ds.FinalizedQuery, cb ds.RawRunCB) error {
return r.c.Run.upFilterStop(r.ds.Run(q, cb))
func (r *dsCounter) Count(q *ds.FinalizedQuery) (int64, error) {
count, err := r.ds.Count(q)
return count, r.c.Count.up(err)
func (r *dsCounter) RunInTransaction(f func(context.Context) error, opts *ds.TransactionOptions) error {
return r.c.RunInTransaction.up(r.ds.RunInTransaction(f, opts))
func (r *dsCounter) DeleteMulti(keys []*ds.Key, cb ds.DeleteMultiCB) error {
return r.c.DeleteMulti.upFilterStop(r.ds.DeleteMulti(keys, cb))
func (r *dsCounter) GetMulti(keys []*ds.Key, meta ds.MultiMetaGetter, cb ds.GetMultiCB) error {
return r.c.GetMulti.upFilterStop(r.ds.GetMulti(keys, meta, cb))
func (r *dsCounter) PutMulti(keys []*ds.Key, vals []ds.PropertyMap, cb ds.NewKeyCB) error {
return r.c.PutMulti.upFilterStop(r.ds.PutMulti(keys, vals, cb))
func (r *dsCounter) CurrentTransaction() ds.Transaction {
return r.ds.CurrentTransaction()
func (r *dsCounter) WithoutTransaction() context.Context {
return r.ds.WithoutTransaction()
func (r *dsCounter) Constraints() ds.Constraints {
return r.ds.Constraints()
func (r *dsCounter) GetTestable() ds.Testable {
return r.ds.GetTestable()
// FilterRDS installs a counter datastore filter in the context.
func FilterRDS(c context.Context) (context.Context, *DSCounter) {
state := &DSCounter{}
return ds.AddRawFilters(c, func(ic context.Context, ds ds.RawInterface) ds.RawInterface {
return &dsCounter{state, ds}
}), state
// upFilterStop wraps up, handling the special case datastore.Stop error.
// datastore.Stop will pass through this function, but, unlike other error
// codes, will be counted as a success.
func (e *Entry) upFilterStop(err error) error {
upErr := err
if upErr == ds.Stop {
upErr = nil
return err