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113 lines
2.7 KiB
113 lines
2.7 KiB
package memdb
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import (
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"github.com/chrislusf/seaweedfs/weed/filer2"
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"github.com/google/btree"
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"strings"
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"fmt"
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"time"
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)
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type MemDbStore struct {
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tree *btree.BTree
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}
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type Entry struct {
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*filer2.Entry
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}
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func (a Entry) Less(b btree.Item) bool {
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return strings.Compare(string(a.FullPath), string(b.(Entry).FullPath)) < 0
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}
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func NewMemDbStore() (filer *MemDbStore) {
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filer = &MemDbStore{}
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filer.tree = btree.New(8)
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return
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}
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func (filer *MemDbStore) InsertEntry(entry *filer2.Entry) (err error) {
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// println("inserting", entry.FullPath)
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entry.Crtime = time.Now()
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filer.tree.ReplaceOrInsert(Entry{entry})
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return nil
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}
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func (filer *MemDbStore) UpdateEntry(entry *filer2.Entry) (err error) {
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found, _, err := filer.FindEntry(entry.FullPath)
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if !found {
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return fmt.Errorf("No such file: %s", entry.FullPath)
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}
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entry.Mtime = time.Now()
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filer.tree.ReplaceOrInsert(Entry{entry})
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return nil
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}
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func (filer *MemDbStore) FindEntry(fullpath filer2.FullPath) (found bool, entry *filer2.Entry, err error) {
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item := filer.tree.Get(Entry{&filer2.Entry{FullPath: fullpath}})
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if item == nil {
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return false, nil, nil
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}
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entry = item.(Entry).Entry
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return true, entry, nil
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}
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func (filer *MemDbStore) DeleteEntry(fullpath filer2.FullPath) (entry *filer2.Entry, err error) {
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item := filer.tree.Delete(Entry{&filer2.Entry{FullPath: fullpath}})
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if item == nil {
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return nil, nil
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}
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entry = item.(Entry).Entry
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return entry, nil
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}
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func (filer *MemDbStore) ListDirectoryEntries(fullpath filer2.FullPath, startFileName string, inclusive bool, limit int) (entries []*filer2.Entry, err error) {
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startFrom := string(fullpath)
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if startFileName != "" {
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startFrom = startFrom + "/" + startFileName
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}
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filer.tree.AscendGreaterOrEqual(Entry{&filer2.Entry{FullPath: filer2.FullPath(startFrom)}},
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func(item btree.Item) bool {
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if limit <= 0 {
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return false
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}
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entry := item.(Entry).Entry
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// println("checking", entry.FullPath)
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if entry.FullPath == fullpath {
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// skipping the current directory
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// println("skipping the folder", entry.FullPath)
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return true
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}
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dir, name := entry.FullPath.DirAndName()
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if name == startFileName {
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if inclusive {
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limit--
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entries = append(entries, entry)
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}
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return true
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}
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// only iterate the same prefix
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if !strings.HasPrefix(string(entry.FullPath), string(fullpath)) {
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// println("breaking from", entry.FullPath)
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return false
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}
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if dir != string(fullpath) {
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// this could be items in deeper directories
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// println("skipping deeper folder", entry.FullPath)
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return true
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}
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// now process the directory items
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// println("adding entry", entry.FullPath)
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limit--
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entries = append(entries, entry)
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return true
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},
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)
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return entries, nil
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}
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