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99 lines
2.6 KiB
99 lines
2.6 KiB
package meta_cache
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import (
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"context"
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"fmt"
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"io"
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"time"
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"github.com/chrislusf/seaweedfs/weed/filer"
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"github.com/chrislusf/seaweedfs/weed/glog"
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"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
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"github.com/chrislusf/seaweedfs/weed/util"
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)
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func SubscribeMetaEvents(mc *MetaCache, selfSignature int32, client filer_pb.FilerClient, dir string, lastTsNs int64) error {
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processEventFn := func(resp *filer_pb.SubscribeMetadataResponse) error {
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message := resp.EventNotification
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for _, sig := range message.Signatures {
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if sig == selfSignature && selfSignature != 0 {
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return nil
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}
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}
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dir := resp.Directory
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var oldPath util.FullPath
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var newEntry *filer.Entry
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if message.OldEntry != nil {
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oldPath = util.NewFullPath(dir, message.OldEntry.Name)
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glog.V(4).Infof("deleting %v", oldPath)
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}
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if message.NewEntry != nil {
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if message.NewParentPath != "" {
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dir = message.NewParentPath
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}
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key := util.NewFullPath(dir, message.NewEntry.Name)
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glog.V(4).Infof("creating %v", key)
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newEntry = filer.FromPbEntry(dir, message.NewEntry)
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}
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err := mc.AtomicUpdateEntryFromFiler(context.Background(), oldPath, newEntry)
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if err == nil {
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if message.OldEntry != nil && message.NewEntry != nil {
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if message.OldEntry.Name == message.NewEntry.Name {
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// no need to invalidate
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} else {
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oldKey := util.NewFullPath(resp.Directory, message.OldEntry.Name)
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mc.invalidateFunc(oldKey)
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newKey := util.NewFullPath(dir, message.NewEntry.Name)
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mc.invalidateFunc(newKey)
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}
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} else if message.OldEntry == nil && message.NewEntry != nil {
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// no need to invaalidate
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} else if message.OldEntry != nil && message.NewEntry == nil {
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oldKey := util.NewFullPath(resp.Directory, message.OldEntry.Name)
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mc.invalidateFunc(oldKey)
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}
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}
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return err
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}
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for {
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err := client.WithFilerClient(func(client filer_pb.SeaweedFilerClient) error {
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ctx, cancel := context.WithCancel(context.Background())
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defer cancel()
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stream, err := client.SubscribeMetadata(ctx, &filer_pb.SubscribeMetadataRequest{
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ClientName: "mount",
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PathPrefix: dir,
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SinceNs: lastTsNs,
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Signature: selfSignature,
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})
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if err != nil {
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return fmt.Errorf("subscribe: %v", err)
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}
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for {
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resp, listenErr := stream.Recv()
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if listenErr == io.EOF {
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return nil
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}
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if listenErr != nil {
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return listenErr
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}
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if err := processEventFn(resp); err != nil {
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glog.Fatalf("process %v: %v", resp, err)
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}
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lastTsNs = resp.TsNs
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}
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})
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if err != nil {
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glog.Errorf("subscribing filer meta change: %v", err)
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}
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time.Sleep(time.Second)
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}
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}
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