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134 lines
3.4 KiB
134 lines
3.4 KiB
package meta_cache
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import (
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"context"
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"os"
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"sync"
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"github.com/chrislusf/seaweedfs/weed/filer"
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"github.com/chrislusf/seaweedfs/weed/filer/leveldb"
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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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"github.com/chrislusf/seaweedfs/weed/util/bounded_tree"
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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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actualStore filer.FilerStore
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sync.RWMutex
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visitedBoundary *bounded_tree.BoundedTree
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}
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func NewMetaCache(dbFolder string) *MetaCache {
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return &MetaCache{
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actualStore: openMetaStore(dbFolder),
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visitedBoundary: bounded_tree.NewBoundedTree(),
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}
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}
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func openMetaStore(dbFolder string) filer.FilerStore {
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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 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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filer_pb.BeforeEntrySerialization(entry.Chunks)
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return mc.actualStore.InsertEntry(ctx, entry)
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}
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func (mc *MetaCache) AtomicUpdateEntry(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.visitedBoundary.HasVisited(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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if err := mc.actualStore.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.visitedBoundary.HasVisited(util.FullPath(newDir)) {
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if err := mc.actualStore.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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filer_pb.BeforeEntrySerialization(entry.Chunks)
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return mc.actualStore.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.actualStore.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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filer_pb.AfterEntryDeserialization(entry.Chunks)
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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.actualStore.DeleteEntry(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 int) ([]*filer.Entry, error) {
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mc.RLock()
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defer mc.RUnlock()
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entries, err := mc.actualStore.ListDirectoryEntries(ctx, dirPath, startFileName, includeStartFile, limit)
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if err != nil {
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return nil, err
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}
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for _, entry := range entries {
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filer_pb.AfterEntryDeserialization(entry.Chunks)
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}
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return entries, 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.actualStore.Shutdown()
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}
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