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

impl/memory/taskqueue.go

Index: impl/memory/taskqueue.go
diff --git a/impl/memory/taskqueue.go b/impl/memory/taskqueue.go
index 7b09af1a6602857a1836155a73c180395ae12ece..2af0f5a7117f4345322c298b1d7ddad19003c98d 100644
--- a/impl/memory/taskqueue.go
+++ b/impl/memory/taskqueue.go
@@ -5,12 +5,11 @@
 package memory
 
 import (
-	"net/http"
 	"regexp"
+	"sync/atomic"
 
 	"golang.org/x/net/context"
 
-	"github.com/luci/gae/impl/dummy"
 	tq "github.com/luci/gae/service/taskqueue"
 	"github.com/luci/luci-go/common/errors"
 	"github.com/luci/luci-go/common/mathrand"
@@ -19,18 +18,16 @@ import (
 /////////////////////////////// public functions ///////////////////////////////
 
 func useTQ(c context.Context) context.Context {
-	return tq.SetFactory(c, func(ic context.Context) tq.Interface {
+	return tq.SetRawFactory(c, func(ic context.Context) tq.RawInterface {
 		tqd := cur(ic).Get(memContextTQIdx)
 		if x, ok := tqd.(*taskQueueData); ok {
 			return &taskqueueImpl{
-				dummy.TaskQueue(),
 				x,
 				ic,
 				curGID(ic).namespace,
 			}
 		}
 		return &taskqueueTxnImpl{
-			dummy.TaskQueue(),
 			tqd.(*txnTaskQueueData),
 			ic,
 			curGID(ic).namespace,
@@ -41,7 +38,6 @@ func useTQ(c context.Context) context.Context {
 //////////////////////////////// taskqueueImpl /////////////////////////////////
 
 type taskqueueImpl struct {
-	tq.Interface
 	*taskQueueData
 
 	ctx context.Context
@@ -49,12 +45,12 @@ type taskqueueImpl struct {
 }
 
 var (
-	_ = tq.Interface((*taskqueueImpl)(nil))
+	_ = tq.RawInterface((*taskqueueImpl)(nil))
 	_ = tq.Testable((*taskqueueImpl)(nil))
 )
 
 func (t *taskqueueImpl) addLocked(task *tq.Task, queueName string) (*tq.Task, error) {
-	toSched, queueName, err := t.prepTask(t.ctx, t.ns, task, queueName)
+	toSched, err := t.prepTask(t.ctx, t.ns, task, queueName)
 	if err != nil {
 		return nil, err
 	}
@@ -68,21 +64,10 @@ func (t *taskqueueImpl) addLocked(task *tq.Task, queueName string) (*tq.Task, er
 		t.named[queueName][toSched.Name] = toSched
 	}
 
-	return dupTask(toSched), nil
-}
-
-func (t *taskqueueImpl) Add(task *tq.Task, queueName string) (*tq.Task, error) {
-	t.Lock()
-	defer t.Unlock()
-	return t.addLocked(task, queueName)
+	return toSched.Duplicate(), nil
 }
 
 func (t *taskqueueImpl) deleteLocked(task *tq.Task, queueName string) error {
-	queueName, err := t.getQueueName(queueName)
-	if err != nil {
-		return err
-	}
-
 	if _, ok := t.archived[queueName][task.Name]; ok {
 		return errors.New("TOMBSTONED_TASK")
 	}
@@ -97,33 +82,72 @@ func (t *taskqueueImpl) deleteLocked(task *tq.Task, queueName string) error {
 	return nil
 }
 
-func (t *taskqueueImpl) Delete(task *tq.Task, queueName string) error {
+func (t *taskqueueImpl) AddMulti(tasks []*tq.Task, queueName string, cb tq.RawTaskCB) error {
 	t.Lock()
 	defer t.Unlock()
-	return t.deleteLocked(task, queueName)
+
+	queueName, err := t.getQueueNameLocked(queueName)
+	if err != nil {
+		return err
+	}
+
+	for _, task := range tasks {
+		cb(t.addLocked(task, queueName))
+	}
+	return nil
 }
 
-func (t *taskqueueImpl) AddMulti(tasks []*tq.Task, queueName string) ([]*tq.Task, error) {
+func (t *taskqueueImpl) DeleteMulti(tasks []*tq.Task, queueName string, cb tq.RawCB) error {
 	t.Lock()
 	defer t.Unlock()
-	return multi(tasks, queueName, t.addLocked)
+
+	queueName, err := t.getQueueNameLocked(queueName)
+	if err != nil {
+		return err
+	}
+
+	for _, task := range tasks {
+		cb(t.deleteLocked(task, queueName))
+	}
+	return nil
 }
 
-func (t *taskqueueImpl) DeleteMulti(tasks []*tq.Task, queueName string) error {
+func (t *taskqueueImpl) Purge(queueName string) error {
 	t.Lock()
 	defer t.Unlock()
 
-	_, err := multi(tasks, queueName,
-		func(tsk *tq.Task, qn string) (*tq.Task, error) {
-			return nil, t.deleteLocked(tsk, qn)
-		})
-	return err
+	return t.purgeLocked(queueName)
+}
+
+func (t *taskqueueImpl) Stats(queueNames []string, cb tq.RawStatsCB) error {
+	t.Lock()
+	defer t.Unlock()
+
+	for _, qn := range queueNames {
+		qn, err := t.getQueueNameLocked(qn)
+		if err != nil {
+			cb(nil, err)
+		} else {
+			s := tq.Statistics{
+				Tasks: len(t.named[qn]),
+			}
+			for _, t := range t.named[qn] {
+				if s.OldestETA.IsZero() {
+					s.OldestETA = t.ETA
+				} else if t.ETA.Before(s.OldestETA) {
+					s.OldestETA = t.ETA
+				}
+			}
+			cb(&s, nil)
+		}
+	}
+
+	return nil
 }
 
 /////////////////////////////// taskqueueTxnImpl ///////////////////////////////
 
 type taskqueueTxnImpl struct {
-	tq.Interface
 	*txnTaskQueueData
 
 	ctx context.Context
@@ -131,12 +155,12 @@ type taskqueueTxnImpl struct {
 }
 
 var _ interface {
-	tq.Interface
+	tq.RawInterface
 	tq.Testable
 } = (*taskqueueTxnImpl)(nil)
 
 func (t *taskqueueTxnImpl) addLocked(task *tq.Task, queueName string) (*tq.Task, error) {
-	toSched, queueName, err := t.parent.prepTask(t.ctx, t.ns, task, queueName)
+	toSched, err := t.parent.prepTask(t.ctx, t.ns, task, queueName)
 	if err != nil {
 		return nil, err
 	}
@@ -161,30 +185,41 @@ func (t *taskqueueTxnImpl) addLocked(task *tq.Task, queueName string) (*tq.Task,
 	//		We should verify that the .Name for a task added in a transaction is
 	//		meaningless. Maybe names generated in a transaction are somehow
 	//		guaranteed to be meaningful?
-	toRet := dupTask(toSched)
+	toRet := toSched.Duplicate()
 	toRet.Name = ""
 
 	return toRet, nil
 }
 
-func (t *taskqueueTxnImpl) Add(task *tq.Task, queueName string) (retTask *tq.Task, err error) {
-	err = t.run(func() (err error) {
-		t.Lock()
-		defer t.Unlock()
-		retTask, err = t.addLocked(task, queueName)
-		return
-	})
-	return
+func (t *taskqueueTxnImpl) AddMulti(tasks []*tq.Task, queueName string, cb tq.RawTaskCB) error {
+	if atomic.LoadInt32(&t.closed) == 1 {
+		return errors.New("taskqueue: transaction context has expired")
+	}
+
+	t.Lock()
+	defer t.Unlock()
+
+	queueName, err := t.parent.getQueueNameLocked(queueName)
+	if err != nil {
+		return err
+	}
+
+	for _, task := range tasks {
+		cb(t.addLocked(task, queueName))
+	}
+	return nil
 }
 
-func (t *taskqueueTxnImpl) AddMulti(tasks []*tq.Task, queueName string) (retTasks []*tq.Task, err error) {
-	err = t.run(func() (err error) {
-		t.Lock()
-		defer t.Unlock()
-		retTasks, err = multi(tasks, queueName, t.addLocked)
-		return
-	})
-	return
+func (t *taskqueueTxnImpl) DeleteMulti([]*tq.Task, string, tq.RawCB) error {
+	return errors.New("taskqueue: cannot DeleteMulti from a transaction")
+}
+
+func (t *taskqueueTxnImpl) Purge(string) error {
+	return errors.New("taskqueue: cannot Purge from a transaction")
+}
+
+func (t *taskqueueTxnImpl) Stats([]string, tq.RawStatsCB) error {
+	return errors.New("taskqueue: cannot Stats from a transaction")
 }
 
 ////////////////////////////// private functions ///////////////////////////////
@@ -206,49 +241,12 @@ func mkName(c context.Context, cur string, queue map[string]*tq.Task) string {
 	return cur
 }
 
-func multi(tasks []*tq.Task, queueName string, f func(*tq.Task, string) (*tq.Task, error)) ([]*tq.Task, error) {
-	ret := []*tq.Task(nil)
-	lme := errors.LazyMultiError{Size: len(tasks)}
-	for i, task := range tasks {
-		rt, err := f(task, queueName)
-		ret = append(ret, rt)
-		lme.Assign(i, err)
-	}
-	return ret, lme.Get()
-}
-
-func dupTask(t *tq.Task) *tq.Task {
-	ret := &tq.Task{}
-	*ret = *t
-
-	if t.Header != nil {
-		ret.Header = make(http.Header, len(t.Header))
-		for k, vs := range t.Header {
-			newVs := make([]string, len(vs))
-			copy(newVs, vs)
-			ret.Header[k] = newVs
-		}
-	}
-
-	if t.Payload != nil {
-		ret.Payload = make([]byte, len(t.Payload))
-		copy(ret.Payload, t.Payload)
-	}
-
-	if t.RetryOptions != nil {
-		ret.RetryOptions = &tq.RetryOptions{}
-		*ret.RetryOptions = *t.RetryOptions
-	}
-
-	return ret
-}
-
 func dupQueue(q tq.QueueData) tq.QueueData {
 	r := make(tq.QueueData, len(q))
 	for k, q := range q {
 		r[k] = make(map[string]*tq.Task, len(q))
 		for tn, t := range q {
-			r[k][tn] = dupTask(t)
+			r[k][tn] = t.Duplicate()
 		}
 	}
 	return r