fix leader master /dir/lookup api

Signed-off-by: Lei Liu <lei01.liu@horizon.ai>

weed/sequence/memory_sequencer.go

@@ -15,12 +15,12 @@ func NewMemorySequencer() (m *MemorySequencer) {
 	return
 }
 
-func (m *MemorySequencer) NextFileId(count uint64) (uint64, uint64) {
+func (m *MemorySequencer) NextFileId(count uint64) uint64 {
 	m.sequenceLock.Lock()
 	defer m.sequenceLock.Unlock()
 	ret := m.counter
-	m.counter += uint64(count)
-	return ret, count
+	m.counter += count
+	return ret
 }
 
 func (m *MemorySequencer) SetMax(seenValue uint64) {

weed/sequence/sequence.go

@@ -1,7 +1,7 @@
 package sequence
 
 type Sequencer interface {
-	NextFileId(count uint64) (uint64, uint64)
+	NextFileId(count uint64) uint64
 	SetMax(uint64)
 	Peek() uint64
 }

weed/server/master_server_handlers.go

@@ -65,11 +65,17 @@ func (ms *MasterServer) findVolumeLocation(collection, vid string) operation.Loo
 	var err error
 	if ms.Topo.IsLeader() {
 		volumeId, newVolumeIdErr := needle.NewVolumeId(vid)
-		machines := ms.Topo.Lookup(collection, volumeId)
-		for _, loc := range machines {
-			locations = append(locations, operation.Location{Url: loc.Url(), PublicUrl: loc.PublicUrl})
+		if newVolumeIdErr != nil {
+			err = fmt.Errorf("Unknown volume id %s", vid)
+		} else {
+			machines := ms.Topo.Lookup(collection, volumeId)
+			for _, loc := range machines {
+				locations = append(locations, operation.Location{Url: loc.Url(), PublicUrl: loc.PublicUrl})
+			}
+			if locations == nil {
+				err = fmt.Errorf("volume id %s not found", vid)
+			}
 		}
-		err = newVolumeIdErr
 	} else {
 		machines, getVidLocationsErr := ms.MasterClient.GetVidLocations(vid)
 		for _, loc := range machines {

weed/topology/topology.go

@@ -125,7 +125,7 @@ func (t *Topology) PickForWrite(count uint64, option *VolumeGrowOption) (string,
 	if datanodes.Length() == 0 {
 		return "", 0, nil, fmt.Errorf("no writable volumes available for collection:%s replication:%s ttl:%s", option.Collection, option.ReplicaPlacement.String(), option.Ttl.String())
 	}
-	fileId, count := t.Sequence.NextFileId(count)
+	fileId := t.Sequence.NextFileId(count)
 	return needle.NewFileId(*vid, fileId, rand.Uint32()).String(), count, datanodes.Head(), nil
 }