etcdserver: Create AlarmBackend interface

server/etcdserver/api/v3alarm/alarms.go

@@ -21,7 +21,6 @@ import (
 	pb "go.etcd.io/etcd/api/v3/etcdserverpb"
 	"go.etcd.io/etcd/client/pkg/v3/types"
 	"go.etcd.io/etcd/server/v3/storage/backend"
-	"go.etcd.io/etcd/server/v3/storage/schema"
 
 	"go.uber.org/zap"
 )
@@ -30,6 +29,14 @@ type BackendGetter interface {
 	Backend() backend.Backend
 }
 
+type AlarmBackend interface {
+	CreateAlarmBucket()
+	MustPutAlarm(member *pb.AlarmMember)
+	MustDeleteAlarm(alarm *pb.AlarmMember)
+	GetAllAlarms() ([]*pb.AlarmMember, error)
+	ForceCommit()
+}
+
 type alarmSet map[types.ID]*pb.AlarmMember
 
 // AlarmStore persists alarms to the backend.
@@ -38,14 +45,14 @@ type AlarmStore struct {
 	mu    sync.Mutex
 	types map[pb.AlarmType]alarmSet
 
-	bg BackendGetter
+	be AlarmBackend
 }
 
-func NewAlarmStore(lg *zap.Logger, bg BackendGetter) (*AlarmStore, error) {
+func NewAlarmStore(lg *zap.Logger, be AlarmBackend) (*AlarmStore, error) {
 	if lg == nil {
 		lg = zap.NewNop()
 	}
-	ret := &AlarmStore{lg: lg, types: make(map[pb.AlarmType]alarmSet), bg: bg}
+	ret := &AlarmStore{lg: lg, types: make(map[pb.AlarmType]alarmSet), be: be}
 	err := ret.restore()
 	return ret, err
 }
@@ -59,7 +66,7 @@ func (a *AlarmStore) Activate(id types.ID, at pb.AlarmType) *pb.AlarmMember {
 		return m
 	}
 
-	schema.MustPutAlarm(a.lg, a.bg.Backend().BatchTx(), newAlarm)
+	a.be.MustPutAlarm(newAlarm)
 	return newAlarm
 }
 
@@ -79,7 +86,7 @@ func (a *AlarmStore) Deactivate(id types.ID, at pb.AlarmType) *pb.AlarmMember {
 
 	delete(t, id)
 
-	schema.MustDeleteAlarm(a.lg, a.bg.Backend().BatchTx(), m)
+	a.be.MustDeleteAlarm(m)
 	return m
 }
 
@@ -101,20 +108,15 @@ func (a *AlarmStore) Get(at pb.AlarmType) (ret []*pb.AlarmMember) {
 }
 
 func (a *AlarmStore) restore() error {
-	b := a.bg.Backend()
-	tx := b.BatchTx()
-
-	tx.Lock()
-	schema.UnsafeCreateAlarmBucket(tx)
-	ms, err := schema.UnsafeGetAllAlarms(tx)
-	tx.Unlock()
+	a.be.CreateAlarmBucket()
+	ms, err := a.be.GetAllAlarms()
 	if err != nil {
 		return err
 	}
 	for _, m := range ms {
 		a.addToMap(m)
 	}
-	b.ForceCommit()
+	a.be.ForceCommit()
 	return err
 }
 

server/etcdserver/server.go

@@ -2361,7 +2361,7 @@ func (s *EtcdServer) AuthStore() auth.AuthStore { return s.authStore }
 
 func (s *EtcdServer) restoreAlarms() error {
 	s.applyV3 = s.newApplierV3()
-	as, err := v3alarm.NewAlarmStore(s.lg, s)
+	as, err := v3alarm.NewAlarmStore(s.lg, schema.NewAlarmBackend(s.lg, s.be))
 	if err != nil {
 		return err
 	}

server/storage/schema/alarm.go

@@ -20,41 +20,65 @@ import (
 	"go.uber.org/zap"
 )
 
-func UnsafeCreateAlarmBucket(tx backend.BatchTx) {
+type alarmBackend struct {
+	lg *zap.Logger
+	be backend.Backend
+}
+
+func NewAlarmBackend(lg *zap.Logger, be backend.Backend) *alarmBackend {
+	return &alarmBackend{
+		lg: lg,
+		be: be,
+	}
+}
+
+func (s *alarmBackend) CreateAlarmBucket() {
+	tx := s.be.BatchTx()
+	tx.Lock()
+	defer tx.Unlock()
 	tx.UnsafeCreateBucket(Alarm)
 }
 
-func MustPutAlarm(lg *zap.Logger, tx backend.BatchTx, alarm *etcdserverpb.AlarmMember) {
+func (s *alarmBackend) MustPutAlarm(alarm *etcdserverpb.AlarmMember) {
+	tx := s.be.BatchTx()
 	tx.Lock()
 	defer tx.Unlock()
-	MustUnsafePutAlarm(lg, tx, alarm)
+	s.mustUnsafePutAlarm(tx, alarm)
 }
 
-func MustUnsafePutAlarm(lg *zap.Logger, tx backend.BatchTx, alarm *etcdserverpb.AlarmMember) {
+func (s *alarmBackend) mustUnsafePutAlarm(tx backend.BatchTx, alarm *etcdserverpb.AlarmMember) {
 	v, err := alarm.Marshal()
 	if err != nil {
-		lg.Panic("failed to marshal alarm member", zap.Error(err))
+		s.lg.Panic("failed to marshal alarm member", zap.Error(err))
 	}
 
 	tx.UnsafePut(Alarm, v, nil)
 }
 
-func MustDeleteAlarm(lg *zap.Logger, tx backend.BatchTx, alarm *etcdserverpb.AlarmMember) {
+func (s *alarmBackend) MustDeleteAlarm(alarm *etcdserverpb.AlarmMember) {
+	tx := s.be.BatchTx()
 	tx.Lock()
 	defer tx.Unlock()
-	MustUnsafeDeleteAlarm(lg, tx, alarm)
+	s.mustUnsafeDeleteAlarm(tx, alarm)
 }
 
-func MustUnsafeDeleteAlarm(lg *zap.Logger, tx backend.BatchTx, alarm *etcdserverpb.AlarmMember) {
+func (s *alarmBackend) mustUnsafeDeleteAlarm(tx backend.BatchTx, alarm *etcdserverpb.AlarmMember) {
 	v, err := alarm.Marshal()
 	if err != nil {
-		lg.Panic("failed to marshal alarm member", zap.Error(err))
+		s.lg.Panic("failed to marshal alarm member", zap.Error(err))
 	}
 
 	tx.UnsafeDelete(Alarm, v)
 }
 
-func UnsafeGetAllAlarms(tx backend.ReadTx) ([]*etcdserverpb.AlarmMember, error) {
+func (s *alarmBackend) GetAllAlarms() ([]*etcdserverpb.AlarmMember, error) {
+	tx := s.be.ReadTx()
+	tx.Lock()
+	defer tx.Unlock()
+	return s.unsafeGetAllAlarms(tx)
+}
+
+func (s *alarmBackend) unsafeGetAllAlarms(tx backend.ReadTx) ([]*etcdserverpb.AlarmMember, error) {
 	ms := []*etcdserverpb.AlarmMember{}
 	err := tx.UnsafeForEach(Alarm, func(k, v []byte) error {
 		var m etcdserverpb.AlarmMember
@@ -66,3 +90,7 @@ func UnsafeGetAllAlarms(tx backend.ReadTx) ([]*etcdserverpb.AlarmMember, error)
 	})
 	return ms, err
 }
+
+func (s alarmBackend) ForceCommit() {
+	s.be.ForceCommit()
+}