etcdserver: Move all named keys to buckets module

server/auth/store.go

@@ -40,11 +40,8 @@ import (
 )
 
 var (
-	enableFlagKey = []byte("authEnabled")
-	authEnabled   = []byte{1}
-	authDisabled  = []byte{0}
-
-	revisionKey = []byte("authRevision")
+	authEnabled  = []byte{1}
+	authDisabled = []byte{0}
 
 	rootPerm = authpb.Permission{PermType: authpb.READWRITE, Key: []byte{}, RangeEnd: []byte{0}}
 
@@ -240,7 +237,7 @@ func (as *authStore) AuthEnable() error {
 		return ErrRootRoleNotExist
 	}
 
-	tx.UnsafePut(buckets.Auth, enableFlagKey, authEnabled)
+	tx.UnsafePut(buckets.Auth, buckets.AuthEnabledKeyName, authEnabled)
 
 	as.enabled = true
 	as.tokenProvider.enable()
@@ -262,7 +259,7 @@ func (as *authStore) AuthDisable() {
 	b := as.be
 	tx := b.BatchTx()
 	tx.Lock()
-	tx.UnsafePut(buckets.Auth, enableFlagKey, authDisabled)
+	tx.UnsafePut(buckets.Auth, buckets.AuthEnabledKeyName, authDisabled)
 	as.commitRevision(tx)
 	tx.Unlock()
 	b.ForceCommit()
@@ -357,7 +354,7 @@ func (as *authStore) Recover(be backend.Backend) {
 	as.be = be
 	tx := be.BatchTx()
 	tx.Lock()
-	_, vs := tx.UnsafeRange(buckets.Auth, enableFlagKey, nil, 0)
+	_, vs := tx.UnsafeRange(buckets.Auth, buckets.AuthEnabledKeyName, nil, 0)
 	if len(vs) == 1 {
 		if bytes.Equal(vs[0], authEnabled) {
 			enabled = true
@@ -1041,7 +1038,7 @@ func NewAuthStore(lg *zap.Logger, be backend.Backend, tp TokenProvider, bcryptCo
 	tx.UnsafeCreateBucket(buckets.AuthRoles)
 
 	enabled := false
-	_, vs := tx.UnsafeRange(buckets.Auth, enableFlagKey, nil, 0)
+	_, vs := tx.UnsafeRange(buckets.Auth, buckets.AuthEnabledKeyName, nil, 0)
 	if len(vs) == 1 {
 		if bytes.Equal(vs[0], authEnabled) {
 			enabled = true
@@ -1084,11 +1081,11 @@ func (as *authStore) commitRevision(tx backend.BatchTx) {
 	atomic.AddUint64(&as.revision, 1)
 	revBytes := make([]byte, revBytesLen)
 	binary.BigEndian.PutUint64(revBytes, as.Revision())
-	tx.UnsafePut(buckets.Auth, revisionKey, revBytes)
+	tx.UnsafePut(buckets.Auth, buckets.AuthRevisionKeyName, revBytes)
 }
 
 func getRevision(tx backend.BatchTx) uint64 {
-	_, vs := tx.UnsafeRange(buckets.Auth, revisionKey, nil, 0)
+	_, vs := tx.UnsafeRange(buckets.Auth, buckets.AuthRevisionKeyName, nil, 0)
 	if len(vs) != 1 {
 		// this can happen in the initialization phase
 		return 0

server/etcdserver/api/membership/cluster.go

@@ -697,7 +697,7 @@ func clusterVersionFromStore(lg *zap.Logger, st v2store.Store) *semver.Version {
 
 // The field is populated since etcd v3.5.
 func clusterVersionFromBackend(lg *zap.Logger, be backend.Backend) *semver.Version {
-	ckey := backendClusterVersionKey()
+	ckey := buckets.ClusterClusterVersionKeyName
 	tx := be.ReadTx()
 	tx.RLock()
 	defer tx.RUnlock()
@@ -716,7 +716,7 @@ func clusterVersionFromBackend(lg *zap.Logger, be backend.Backend) *semver.Versi
 
 // The field is populated since etcd v3.5.
 func downgradeInfoFromBackend(lg *zap.Logger, be backend.Backend) *DowngradeInfo {
-	dkey := backendDowngradeKey()
+	dkey := buckets.ClusterDowngradeKeyName
 	tx := be.ReadTx()
 	tx.Lock()
 	defer tx.Unlock()

server/etcdserver/api/membership/store.go

@@ -42,7 +42,7 @@ var (
 )
 
 func mustSaveMemberToBackend(lg *zap.Logger, be backend.Backend, m *Member) {
-	mkey := backendMemberKey(m.ID)
+	mkey := buckets.BackendMemberKey(m.ID)
 	mvalue, err := json.Marshal(m)
 	if err != nil {
 		lg.Panic("failed to marshal member", zap.Error(err))
@@ -65,7 +65,7 @@ func TrimClusterFromBackend(be backend.Backend) error {
 }
 
 func mustDeleteMemberFromBackend(be backend.Backend, id types.ID) {
-	mkey := backendMemberKey(id)
+	mkey := buckets.BackendMemberKey(id)
 
 	tx := be.BatchTx()
 	tx.Lock()
@@ -160,7 +160,7 @@ func TrimMembershipFromV2Store(lg *zap.Logger, s v2store.Store) error {
 
 // The field is populated since etcd v3.5.
 func mustSaveClusterVersionToBackend(be backend.Backend, ver *semver.Version) {
-	ckey := backendClusterVersionKey()
+	ckey := buckets.ClusterClusterVersionKeyName
 
 	tx := be.BatchTx()
 	tx.Lock()
@@ -170,7 +170,7 @@ func mustSaveClusterVersionToBackend(be backend.Backend, ver *semver.Version) {
 
 // The field is populated since etcd v3.5.
 func mustSaveDowngradeToBackend(lg *zap.Logger, be backend.Backend, downgrade *DowngradeInfo) {
-	dkey := backendDowngradeKey()
+	dkey := buckets.ClusterDowngradeKeyName
 	dvalue, err := json.Marshal(downgrade)
 	if err != nil {
 		lg.Panic("failed to marshal downgrade information", zap.Error(err))
@@ -281,18 +281,6 @@ func nodeToMember(lg *zap.Logger, n *v2store.NodeExtern) (*Member, error) {
 	return m, nil
 }
 
-func backendMemberKey(id types.ID) []byte {
-	return []byte(id.String())
-}
-
-func backendClusterVersionKey() []byte {
-	return []byte("clusterVersion")
-}
-
-func backendDowngradeKey() []byte {
-	return []byte("downgrade")
-}
-
 func mustCreateBackendBuckets(be backend.Backend) {
 	tx := be.BatchTx()
 	tx.Lock()

server/mvcc/buckets/bucket.go

@@ -17,6 +17,7 @@ package buckets
 import (
 	"bytes"
 
+	"go.etcd.io/etcd/client/pkg/v3/types"
 	"go.etcd.io/etcd/server/v3/mvcc/backend"
 )
 
@@ -67,11 +68,17 @@ func (b bucket) String() string          { return string(b.Name()) }
 func (b bucket) IsSafeRangeBucket() bool { return b.safeRangeBucket }
 
 var (
-	// Since v3.0
+	// Pre v3.5
+	ScheduledCompactKeyName    = []byte("scheduledCompactRev")
+	FinishedCompactKeyName     = []byte("finishedCompactRev")
 	MetaConsistentIndexKeyName = []byte("consistent_index")
+	AuthEnabledKeyName         = []byte("authEnabled")
+	AuthRevisionKeyName        = []byte("authRevision")
 	// Since v3.5
-	MetaTermKeyName   = []byte("term")
-	MetaConfStateName = []byte("confState")
+	MetaTermKeyName              = []byte("term")
+	MetaConfStateName            = []byte("confState")
+	ClusterClusterVersionKeyName = []byte("clusterVersion")
+	ClusterDowngradeKeyName      = []byte("downgrade")
 	// Since v3.6
 	MetaStorageVersionName = []byte("storageVersion")
 	// Before adding new meta key please update server/etcdserver/version
@@ -84,3 +91,7 @@ func DefaultIgnores(bucket, key []byte) bool {
 	return bytes.Compare(bucket, Meta.Name()) == 0 &&
 		(bytes.Compare(key, MetaTermKeyName) == 0 || bytes.Compare(key, MetaConsistentIndexKeyName) == 0)
 }
+
+func BackendMemberKey(id types.ID) []byte {
+	return []byte(id.String())
+}

server/mvcc/kvstore.go

@@ -34,9 +34,6 @@ import (
 )
 
 var (
-	scheduledCompactKeyName = []byte("scheduledCompactRev")
-	finishedCompactKeyName  = []byte("finishedCompactRev")
-
 	ErrCompacted = errors.New("mvcc: required revision has been compacted")
 	ErrFutureRev = errors.New("mvcc: required revision is a future revision")
 )
@@ -244,7 +241,7 @@ func (s *store) updateCompactRev(rev int64) (<-chan struct{}, error) {
 
 	tx := s.b.BatchTx()
 	tx.Lock()
-	tx.UnsafePut(buckets.Meta, scheduledCompactKeyName, rbytes)
+	tx.UnsafePut(buckets.Meta, buckets.ScheduledCompactKeyName, rbytes)
 	tx.Unlock()
 	// ensure that desired compaction is persisted
 	s.b.ForceCommit()
@@ -342,7 +339,7 @@ func (s *store) restore() error {
 	tx := s.b.BatchTx()
 	tx.Lock()
 
-	_, finishedCompactBytes := tx.UnsafeRange(buckets.Meta, finishedCompactKeyName, nil, 0)
+	_, finishedCompactBytes := tx.UnsafeRange(buckets.Meta, buckets.FinishedCompactKeyName, nil, 0)
 	if len(finishedCompactBytes) != 0 {
 		s.revMu.Lock()
 		s.compactMainRev = bytesToRev(finishedCompactBytes[0]).main
@@ -350,12 +347,12 @@ func (s *store) restore() error {
 		s.lg.Info(
 			"restored last compact revision",
 			zap.Stringer("meta-bucket-name", buckets.Meta),
-			zap.String("meta-bucket-name-key", string(finishedCompactKeyName)),
+			zap.String("meta-bucket-name-key", string(buckets.FinishedCompactKeyName)),
 			zap.Int64("restored-compact-revision", s.compactMainRev),
 		)
 		s.revMu.Unlock()
 	}
-	_, scheduledCompactBytes := tx.UnsafeRange(buckets.Meta, scheduledCompactKeyName, nil, 0)
+	_, scheduledCompactBytes := tx.UnsafeRange(buckets.Meta, buckets.ScheduledCompactKeyName, nil, 0)
 	scheduledCompact := int64(0)
 	if len(scheduledCompactBytes) != 0 {
 		scheduledCompact = bytesToRev(scheduledCompactBytes[0]).main
@@ -427,7 +424,7 @@ func (s *store) restore() error {
 		s.lg.Info(
 			"resume scheduled compaction",
 			zap.Stringer("meta-bucket-name", buckets.Meta),
-			zap.String("meta-bucket-name-key", string(scheduledCompactKeyName)),
+			zap.String("meta-bucket-name-key", string(buckets.ScheduledCompactKeyName)),
 			zap.Int64("scheduled-compact-revision", scheduledCompact),
 		)
 	}

server/mvcc/kvstore_compaction.go

@@ -55,7 +55,7 @@ func (s *store) scheduleCompaction(compactMainRev int64, keep map[revision]struc
 		if len(keys) < batchNum {
 			rbytes := make([]byte, 8+1+8)
 			revToBytes(revision{main: compactMainRev}, rbytes)
-			tx.UnsafePut(buckets.Meta, finishedCompactKeyName, rbytes)
+			tx.UnsafePut(buckets.Meta, buckets.FinishedCompactKeyName, rbytes)
 			tx.Unlock()
 			s.lg.Info(
 				"finished scheduled compaction",

server/mvcc/kvstore_compaction_test.go

@@ -89,10 +89,10 @@ func TestScheduleCompaction(t *testing.T) {
 				t.Errorf("#%d: range on %v = %d, want 1", i, rev, len(keys))
 			}
 		}
-		_, vals := tx.UnsafeRange(buckets.Meta, finishedCompactKeyName, nil, 0)
+		_, vals := tx.UnsafeRange(buckets.Meta, buckets.FinishedCompactKeyName, nil, 0)
 		revToBytes(revision{main: tt.rev}, ibytes)
 		if w := [][]byte{ibytes}; !reflect.DeepEqual(vals, w) {
-			t.Errorf("#%d: vals on %v = %+v, want %+v", i, finishedCompactKeyName, vals, w)
+			t.Errorf("#%d: vals on %v = %+v, want %+v", i, buckets.FinishedCompactKeyName, vals, w)
 		}
 		tx.Unlock()
 

server/mvcc/kvstore_test.go

@@ -343,10 +343,10 @@ func TestStoreCompact(t *testing.T) {
 	end := make([]byte, 8)
 	binary.BigEndian.PutUint64(end, uint64(4))
 	wact := []testutil.Action{
-		{Name: "put", Params: []interface{}{buckets.Meta, scheduledCompactKeyName, newTestRevBytes(revision{3, 0})}},
+		{Name: "put", Params: []interface{}{buckets.Meta, buckets.ScheduledCompactKeyName, newTestRevBytes(revision{3, 0})}},
 		{Name: "range", Params: []interface{}{buckets.Key, make([]byte, 17), end, int64(10000)}},
 		{Name: "delete", Params: []interface{}{buckets.Key, key2}},
-		{Name: "put", Params: []interface{}{buckets.Meta, finishedCompactKeyName, newTestRevBytes(revision{3, 0})}},
+		{Name: "put", Params: []interface{}{buckets.Meta, buckets.FinishedCompactKeyName, newTestRevBytes(revision{3, 0})}},
 	}
 	if g := b.tx.Action(); !reflect.DeepEqual(g, wact) {
 		t.Errorf("tx actions = %+v, want %+v", g, wact)
@@ -384,8 +384,8 @@ func TestStoreRestore(t *testing.T) {
 	if err != nil {
 		t.Fatal(err)
 	}
-	b.tx.rangeRespc <- rangeResp{[][]byte{finishedCompactKeyName}, [][]byte{newTestRevBytes(revision{3, 0})}}
-	b.tx.rangeRespc <- rangeResp{[][]byte{scheduledCompactKeyName}, [][]byte{newTestRevBytes(revision{3, 0})}}
+	b.tx.rangeRespc <- rangeResp{[][]byte{buckets.FinishedCompactKeyName}, [][]byte{newTestRevBytes(revision{3, 0})}}
+	b.tx.rangeRespc <- rangeResp{[][]byte{buckets.ScheduledCompactKeyName}, [][]byte{newTestRevBytes(revision{3, 0})}}
 
 	b.tx.rangeRespc <- rangeResp{[][]byte{putkey, delkey}, [][]byte{putkvb, delkvb}}
 	b.tx.rangeRespc <- rangeResp{nil, nil}
@@ -399,8 +399,8 @@ func TestStoreRestore(t *testing.T) {
 		t.Errorf("current rev = %v, want 5", s.currentRev)
 	}
 	wact := []testutil.Action{
-		{Name: "range", Params: []interface{}{buckets.Meta, finishedCompactKeyName, []byte(nil), int64(0)}},
-		{Name: "range", Params: []interface{}{buckets.Meta, scheduledCompactKeyName, []byte(nil), int64(0)}},
+		{Name: "range", Params: []interface{}{buckets.Meta, buckets.FinishedCompactKeyName, []byte(nil), int64(0)}},
+		{Name: "range", Params: []interface{}{buckets.Meta, buckets.ScheduledCompactKeyName, []byte(nil), int64(0)}},
 		{Name: "range", Params: []interface{}{buckets.Key, newTestRevBytes(revision{1, 0}), newTestRevBytes(revision{math.MaxInt64, math.MaxInt64}), int64(restoreChunkKeys)}},
 	}
 	if g := b.tx.Action(); !reflect.DeepEqual(g, wact) {
@@ -485,7 +485,7 @@ func TestRestoreContinueUnfinishedCompaction(t *testing.T) {
 		revToBytes(revision{main: 2}, rbytes)
 		tx := s0.b.BatchTx()
 		tx.Lock()
-		tx.UnsafePut(buckets.Meta, scheduledCompactKeyName, rbytes)
+		tx.UnsafePut(buckets.Meta, buckets.ScheduledCompactKeyName, rbytes)
 		tx.Unlock()
 
 		s0.Close()