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![wusong](/assets/img/avatar_default.png)
Signed-off-by: wusong <wangwusong@virtaitech.com> Signed-off-by: wusong <wangwusong@virtaitech.com> Co-authored-by: wusong <wangwusong@virtaitech.com>
166 lines
4.5 KiB
Go
166 lines
4.5 KiB
Go
package meta_cache
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import (
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"context"
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"os"
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"github.com/seaweedfs/seaweedfs/weed/filer"
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"github.com/seaweedfs/seaweedfs/weed/filer/leveldb"
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"github.com/seaweedfs/seaweedfs/weed/glog"
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"github.com/seaweedfs/seaweedfs/weed/pb/filer_pb"
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"github.com/seaweedfs/seaweedfs/weed/util"
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)
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// need to have logic similar to FilerStoreWrapper
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// e.g. fill fileId field for chunks
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type MetaCache struct {
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root util.FullPath
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localStore filer.VirtualFilerStore
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// sync.RWMutex
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uidGidMapper *UidGidMapper
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markCachedFn func(fullpath util.FullPath)
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isCachedFn func(fullpath util.FullPath) bool
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invalidateFunc func(fullpath util.FullPath, entry *filer_pb.Entry)
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}
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func NewMetaCache(dbFolder string, uidGidMapper *UidGidMapper, root util.FullPath,
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markCachedFn func(path util.FullPath), isCachedFn func(path util.FullPath) bool, invalidateFunc func(util.FullPath, *filer_pb.Entry)) *MetaCache {
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return &MetaCache{
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root: root,
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localStore: openMetaStore(dbFolder),
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markCachedFn: markCachedFn,
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isCachedFn: isCachedFn,
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uidGidMapper: uidGidMapper,
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invalidateFunc: func(fullpath util.FullPath, entry *filer_pb.Entry) {
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invalidateFunc(fullpath, entry)
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},
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}
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}
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func openMetaStore(dbFolder string) filer.VirtualFilerStore {
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os.RemoveAll(dbFolder)
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os.MkdirAll(dbFolder, 0755)
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store := &leveldb.LevelDBStore{}
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config := &cacheConfig{
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dir: dbFolder,
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}
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if err := store.Initialize(config, ""); err != nil {
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glog.Fatalf("Failed to initialize metadata cache store for %s: %+v", store.GetName(), err)
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}
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return filer.NewFilerStoreWrapper(store)
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}
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func (mc *MetaCache) InsertEntry(ctx context.Context, entry *filer.Entry) error {
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//mc.Lock()
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//defer mc.Unlock()
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return mc.doInsertEntry(ctx, entry)
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}
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func (mc *MetaCache) doInsertEntry(ctx context.Context, entry *filer.Entry) error {
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return mc.localStore.InsertEntry(ctx, entry)
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}
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func (mc *MetaCache) AtomicUpdateEntryFromFiler(ctx context.Context, oldPath util.FullPath, newEntry *filer.Entry) error {
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//mc.Lock()
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//defer mc.Unlock()
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oldDir, _ := oldPath.DirAndName()
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if mc.isCachedFn(util.FullPath(oldDir)) {
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if oldPath != "" {
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if newEntry != nil && oldPath == newEntry.FullPath {
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// skip the unnecessary deletion
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// leave the update to the following InsertEntry operation
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} else {
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ctx = context.WithValue(ctx, "OP", "MV")
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glog.V(3).Infof("DeleteEntry %s", oldPath)
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if err := mc.localStore.DeleteEntry(ctx, oldPath); err != nil {
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return err
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}
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}
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}
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} else {
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// println("unknown old directory:", oldDir)
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}
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if newEntry != nil {
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newDir, _ := newEntry.DirAndName()
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if mc.isCachedFn(util.FullPath(newDir)) {
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glog.V(3).Infof("InsertEntry %s/%s", newDir, newEntry.Name())
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if err := mc.localStore.InsertEntry(ctx, newEntry); err != nil {
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return err
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}
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}
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}
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return nil
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}
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func (mc *MetaCache) UpdateEntry(ctx context.Context, entry *filer.Entry) error {
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//mc.Lock()
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//defer mc.Unlock()
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return mc.localStore.UpdateEntry(ctx, entry)
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}
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func (mc *MetaCache) FindEntry(ctx context.Context, fp util.FullPath) (entry *filer.Entry, err error) {
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//mc.RLock()
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//defer mc.RUnlock()
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entry, err = mc.localStore.FindEntry(ctx, fp)
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if err != nil {
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return nil, err
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}
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mc.mapIdFromFilerToLocal(entry)
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return
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}
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func (mc *MetaCache) DeleteEntry(ctx context.Context, fp util.FullPath) (err error) {
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//mc.Lock()
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//defer mc.Unlock()
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return mc.localStore.DeleteEntry(ctx, fp)
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}
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func (mc *MetaCache) DeleteFolderChildren(ctx context.Context, fp util.FullPath) (err error) {
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//mc.Lock()
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//defer mc.Unlock()
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return mc.localStore.DeleteFolderChildren(ctx, fp)
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}
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func (mc *MetaCache) ListDirectoryEntries(ctx context.Context, dirPath util.FullPath, startFileName string, includeStartFile bool, limit int64, eachEntryFunc filer.ListEachEntryFunc) error {
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//mc.RLock()
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//defer mc.RUnlock()
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if !mc.isCachedFn(dirPath) {
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// if this request comes after renaming, it should be fine
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glog.Warningf("unsynchronized dir: %v", dirPath)
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}
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_, err := mc.localStore.ListDirectoryEntries(ctx, dirPath, startFileName, includeStartFile, limit, func(entry *filer.Entry) bool {
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mc.mapIdFromFilerToLocal(entry)
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return eachEntryFunc(entry)
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})
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if err != nil {
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return err
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}
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return err
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}
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func (mc *MetaCache) Shutdown() {
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//mc.Lock()
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//defer mc.Unlock()
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mc.localStore.Shutdown()
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}
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func (mc *MetaCache) mapIdFromFilerToLocal(entry *filer.Entry) {
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entry.Attr.Uid, entry.Attr.Gid = mc.uidGidMapper.FilerToLocal(entry.Attr.Uid, entry.Attr.Gid)
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}
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func (mc *MetaCache) Debug() {
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if debuggable, ok := mc.localStore.(filer.Debuggable); ok {
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println("start debugging")
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debuggable.Debug(os.Stderr)
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}
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}
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