Make the rest of the services have a similar raw/user interface structure.

service/taskqueue/taskqueue.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 taskqueue
+
+import (
+        "github.com/luci/luci-go/common/errors"
+        "golang.org/x/net/context"
+)
+
+type taskqueueImpl struct{ RawInterface }
+
+func (t *taskqueueImpl) NewTask(path string) *Task {
+        return &Task{Path: path}
+}
+
+func (t *taskqueueImpl) Add(task *Task, queueName string) error {
+        return errors.SingleError(t.AddMulti([]*Task{task}, queueName))
+}
+
+func (t *taskqueueImpl) Delete(task *Task, queueName string) error {
+        return errors.SingleError(t.DeleteMulti([]*Task{task}, queueName))
+}
+
+func (t *taskqueueImpl) AddMulti(tasks []*Task, queueName string) error {
+        lme := errors.LazyMultiError{Size: len(tasks)}
+        i := 0
+        err := t.RawInterface.AddMulti(tasks, queueName, func(t *Task, err error) {
+                if !lme.Assign(i, err) {
+                        *tasks[i] = *t
+                }
+                i++
+        })
+        if err == nil {
+                err = lme.Get()
+        }
+        return err
+}
+
+func (t *taskqueueImpl) DeleteMulti(tasks []*Task, queueName string) error {
+        lme := errors.LazyMultiError{Size: len(tasks)}
+        i := 0
+        err := t.RawInterface.DeleteMulti(tasks, queueName, func(err error) {
+                lme.Assign(i, err)
+                i++
+        })
+        if err == nil {
+                err = lme.Get()
+        }
+        return err
+}
+
+func (t *taskqueueImpl) Purge(queueName string) error {
+        return t.RawInterface.Purge(queueName)
+}
+
+func (t *taskqueueImpl) Stats(queueNames ...string) ([]Statistics, error) {
+        ret := make([]Statistics, len(queueNames))
+        lme := errors.LazyMultiError{Size: len(queueNames)}
+        i := 0

[dnj, 2015/08/03 22:37:25]

IMO cleaner to allocate "ret" with zero length and len(queueNames) capacity,
then fill via "append".

[dnj (Google), 2015/08/04 03:48:03]

(Pang)

[iannucci, 2015/08/04 03:58:33]

How would this be cleaner? I still need i for the lme.

[dnj, 2015/08/04 18:01:16]

Oh sorry, I didn't see the "i" being used there. Nevermind.

+        err := t.RawInterface.Stats(queueNames, func(s *Statistics, err error) {
+                if !lme.Assign(i, err) {
+                        ret[i] = *s
+                }
+                i++
+        })
+        if err == nil {
+                err = lme.Get()
+        }
+        return ret, err
+}
+
+func (t *taskqueueImpl) Raw() RawInterface {
+        return t.RawInterface
+}
+
+var _ Interface = (*taskqueueImpl)(nil)
+
+func Get(c context.Context) Interface {
+        return &taskqueueImpl{GetRaw(c)}
+}