package meta_cache import ( "context" "github.com/chrislusf/seaweedfs/weed/filer" "github.com/chrislusf/seaweedfs/weed/glog" "github.com/chrislusf/seaweedfs/weed/pb" "github.com/chrislusf/seaweedfs/weed/pb/filer_pb" "github.com/chrislusf/seaweedfs/weed/util" ) func SubscribeMetaEvents(mc *MetaCache, selfSignature int32, client filer_pb.FilerClient, dir string, lastTsNs int64) error { processEventFn := func(resp *filer_pb.SubscribeMetadataResponse) error { message := resp.EventNotification for _, sig := range message.Signatures { if sig == selfSignature && selfSignature != 0 { return nil } } dir := resp.Directory var oldPath util.FullPath var newEntry *filer.Entry if message.OldEntry != nil { oldPath = util.NewFullPath(dir, message.OldEntry.Name) glog.V(4).Infof("deleting %v", oldPath) } if message.NewEntry != nil { if message.NewParentPath != "" { dir = message.NewParentPath } key := util.NewFullPath(dir, message.NewEntry.Name) glog.V(4).Infof("creating %v", key) newEntry = filer.FromPbEntry(dir, message.NewEntry) } err := mc.AtomicUpdateEntryFromFiler(context.Background(), oldPath, newEntry) if err == nil { if message.OldEntry != nil && message.NewEntry != nil { if message.OldEntry.Name == message.NewEntry.Name { // no need to invalidate } else { oldKey := util.NewFullPath(resp.Directory, message.OldEntry.Name) mc.invalidateFunc(oldKey) newKey := util.NewFullPath(dir, message.NewEntry.Name) mc.invalidateFunc(newKey) } } else if message.OldEntry == nil && message.NewEntry != nil { // no need to invaalidate } else if message.OldEntry != nil && message.NewEntry == nil { oldKey := util.NewFullPath(resp.Directory, message.OldEntry.Name) mc.invalidateFunc(oldKey) } } return err } util.RetryForever("followMetaUpdates", func() error { return pb.WithFilerClientFollowMetadata(client, "mount", dir, lastTsNs, selfSignature, processEventFn, true) }, func(err error) bool { glog.Errorf("follow metadata updates: %v", err) return true }) }