package storage import ( "os" "github.com/chrislusf/seaweedfs/weed/glog" "github.com/chrislusf/seaweedfs/weed/storage/erasure_coding" "github.com/chrislusf/seaweedfs/weed/storage/needle_map" . "github.com/chrislusf/seaweedfs/weed/storage/types" ) type SortedFileNeedleMap struct { baseNeedleMapper baseFileName string dbFile *os.File dbFileSize int64 } func NewSortedFileNeedleMap(baseFileName string, indexFile *os.File) (m *SortedFileNeedleMap, err error) { m = &SortedFileNeedleMap{baseFileName: baseFileName} m.indexFile = indexFile fileName := baseFileName + ".sdx" if !isSortedFileFresh(fileName, indexFile) { glog.V(0).Infof("Start to Generate %s from %s", fileName, indexFile.Name()) erasure_coding.WriteSortedFileFromIdx(baseFileName, ".sdx") glog.V(0).Infof("Finished Generating %s from %s", fileName, indexFile.Name()) } glog.V(1).Infof("Opening %s...", fileName) if m.dbFile, err = os.Open(baseFileName + ".sdx"); err != nil { return } dbStat, _ := m.dbFile.Stat() m.dbFileSize = dbStat.Size() glog.V(1).Infof("Loading %s...", indexFile.Name()) mm, indexLoadError := newNeedleMapMetricFromIndexFile(indexFile) if indexLoadError != nil { return nil, indexLoadError } m.mapMetric = *mm return } func isSortedFileFresh(dbFileName string, indexFile *os.File) bool { // normally we always write to index file first dbFile, err := os.Open(dbFileName) if err != nil { return false } defer dbFile.Close() dbStat, dbStatErr := dbFile.Stat() indexStat, indexStatErr := indexFile.Stat() if dbStatErr != nil || indexStatErr != nil { glog.V(0).Infof("Can not stat file: %v and %v", dbStatErr, indexStatErr) return false } return dbStat.ModTime().After(indexStat.ModTime()) } func (m *SortedFileNeedleMap) Get(key NeedleId) (element *needle_map.NeedleValue, ok bool) { offset, size, err := erasure_coding.SearchNeedleFromSortedIndex(m.dbFile, m.dbFileSize, key, nil) ok = err == nil return &needle_map.NeedleValue{Key: key, Offset: offset, Size: size}, ok } func (m *SortedFileNeedleMap) Put(key NeedleId, offset Offset, size uint32) error { return os.ErrInvalid } func (m *SortedFileNeedleMap) Delete(key NeedleId, offset Offset) error { _, size, err := erasure_coding.SearchNeedleFromSortedIndex(m.dbFile, m.dbFileSize, key, nil) if err != nil { if err == erasure_coding.NotFoundError { return nil } return err } if size == TombstoneFileSize { return nil } // write to index file first if err := m.appendToIndexFile(key, offset, TombstoneFileSize); err != nil { return err } _, _, err = erasure_coding.SearchNeedleFromSortedIndex(m.dbFile, m.dbFileSize, key, erasure_coding.MarkNeedleDeleted) return err } func (m *SortedFileNeedleMap) Close() { m.indexFile.Close() m.dbFile.Close() } func (m *SortedFileNeedleMap) Destroy() error { m.Close() os.Remove(m.indexFile.Name()) return os.Remove(m.baseFileName + ".sdx") }