seaweedfs/weed/filer/filer_on_meta_event.go

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package filer
import (
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"bytes"
"math"
"github.com/chrislusf/seaweedfs/weed/glog"
"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
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"github.com/chrislusf/seaweedfs/weed/util"
)
// onMetadataChangeEvent is triggered after filer processed change events from local or remote filers
func (f *Filer) onMetadataChangeEvent(event *filer_pb.SubscribeMetadataResponse) {
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f.maybeReloadFilerConfiguration(event)
f.onBucketEvents(event)
}
func (f *Filer) onBucketEvents(event *filer_pb.SubscribeMetadataResponse) {
message := event.EventNotification
for _, sig := range message.Signatures {
if sig == f.Signature {
return
}
}
if f.DirBucketsPath == event.Directory {
if message.OldEntry == nil && message.NewEntry != nil {
if message.NewEntry.IsDirectory {
f.Store.OnBucketCreation(message.NewEntry.Name)
}
}
if message.OldEntry != nil && message.NewEntry == nil {
if message.OldEntry.IsDirectory {
f.Store.OnBucketDeletion(message.OldEntry.Name)
}
}
}
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}
func (f *Filer) maybeReloadFilerConfiguration(event *filer_pb.SubscribeMetadataResponse) {
if DirectoryEtcSeaweedFS != event.Directory {
if DirectoryEtcSeaweedFS != event.EventNotification.NewParentPath {
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return
}
}
entry := event.EventNotification.NewEntry
if entry == nil {
return
}
glog.V(0).Infof("procesing %v", event)
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if entry.Name == FilerConfName {
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f.reloadFilerConfiguration(entry)
}
}
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func (f *Filer) readEntry(chunks []*filer_pb.FileChunk) ([]byte, error) {
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var buf bytes.Buffer
err := StreamContent(f.MasterClient, &buf, chunks, 0, math.MaxInt64)
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if err != nil {
return nil, err
}
return buf.Bytes(), nil
}
func (f *Filer) reloadFilerConfiguration(entry *filer_pb.Entry) {
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fc := NewFilerConf()
err := fc.loadFromChunks(f, entry.Content, entry.Chunks)
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if err != nil {
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glog.Errorf("read filer conf chunks: %v", err)
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return
}
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f.FilerConf = fc
}
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func (f *Filer) LoadFilerConf() {
fc := NewFilerConf()
err := util.Retry("loadFilerConf", func() error {
return fc.loadFromFiler(f)
})
if err != nil {
glog.Errorf("read filer conf: %v", err)
return
}
f.FilerConf = fc
}