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package meta_cache
import ( "context" "github.com/seaweedfs/seaweedfs/weed/filer" "github.com/seaweedfs/seaweedfs/weed/glog" "github.com/seaweedfs/seaweedfs/weed/pb" "github.com/seaweedfs/seaweedfs/weed/pb/filer_pb" "github.com/seaweedfs/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 { oldKey := util.NewFullPath(resp.Directory, message.OldEntry.Name) mc.invalidateFunc(oldKey, message.OldEntry) if message.OldEntry.Name != message.NewEntry.Name { newKey := util.NewFullPath(dir, message.NewEntry.Name) mc.invalidateFunc(newKey, message.NewEntry) } } else if filer_pb.IsCreate(resp) { // no need to invalidate
} else if filer_pb.IsDelete(resp) { oldKey := util.NewFullPath(resp.Directory, message.OldEntry.Name) mc.invalidateFunc(oldKey, message.OldEntry) } }
return err
}
var clientEpoch int32 metadataFollowOption := &pb.MetadataFollowOption{ ClientName: "mount", ClientId: selfSignature, ClientEpoch: clientEpoch, SelfSignature: selfSignature, PathPrefix: dir, AdditionalPathPrefixes: nil, DirectoriesToWatch: nil, StartTsNs: lastTsNs, StopTsNs: 0, EventErrorType: pb.FatalOnError, } util.RetryForever("followMetaUpdates", func() error { clientEpoch++ return pb.WithFilerClientFollowMetadata(client, metadataFollowOption, processEventFn) }, func(err error) bool { glog.Errorf("follow metadata updates: %v", err) return true })
return nil }
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