mirror of
https://github.com/chrislusf/seaweedfs
synced 2024-08-31 06:00:38 +02:00
144 lines
4.2 KiB
Go
144 lines
4.2 KiB
Go
package storage
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import (
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"fmt"
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"os"
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"path/filepath"
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"github.com/chrislusf/seaweedfs/weed/storage/idx"
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"github.com/syndtr/goleveldb/leveldb/opt"
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"github.com/chrislusf/seaweedfs/weed/glog"
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"github.com/chrislusf/seaweedfs/weed/storage/needle_map"
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. "github.com/chrislusf/seaweedfs/weed/storage/types"
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"github.com/chrislusf/seaweedfs/weed/util"
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"github.com/syndtr/goleveldb/leveldb"
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)
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type LevelDbNeedleMap struct {
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baseNeedleMapper
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dbFileName string
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db *leveldb.DB
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}
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func NewLevelDbNeedleMap(dbFileName string, indexFile *os.File, opts *opt.Options) (m *LevelDbNeedleMap, err error) {
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m = &LevelDbNeedleMap{dbFileName: dbFileName}
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m.indexFile = indexFile
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if !isLevelDbFresh(dbFileName, indexFile) {
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glog.V(0).Infof("Start to Generate %s from %s", dbFileName, indexFile.Name())
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generateLevelDbFile(dbFileName, indexFile)
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glog.V(0).Infof("Finished Generating %s from %s", dbFileName, indexFile.Name())
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}
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glog.V(1).Infof("Opening %s...", dbFileName)
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if m.db, err = leveldb.OpenFile(dbFileName, opts); err != nil {
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return
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}
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glog.V(1).Infof("Loading %s...", indexFile.Name())
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mm, indexLoadError := newNeedleMapMetricFromIndexFile(indexFile)
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if indexLoadError != nil {
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return nil, indexLoadError
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}
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m.mapMetric = *mm
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return
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}
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func isLevelDbFresh(dbFileName string, indexFile *os.File) bool {
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// normally we always write to index file first
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dbLogFile, err := os.Open(filepath.Join(dbFileName, "LOG"))
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if err != nil {
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return false
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}
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defer dbLogFile.Close()
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dbStat, dbStatErr := dbLogFile.Stat()
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indexStat, indexStatErr := indexFile.Stat()
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if dbStatErr != nil || indexStatErr != nil {
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glog.V(0).Infof("Can not stat file: %v and %v", dbStatErr, indexStatErr)
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return false
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}
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return dbStat.ModTime().After(indexStat.ModTime())
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}
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func generateLevelDbFile(dbFileName string, indexFile *os.File) error {
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db, err := leveldb.OpenFile(dbFileName, nil)
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if err != nil {
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return err
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}
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defer db.Close()
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return idx.WalkIndexFile(indexFile, func(key NeedleId, offset Offset, size uint32) error {
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if !offset.IsZero() && size != TombstoneFileSize {
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levelDbWrite(db, key, offset, size)
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} else {
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levelDbDelete(db, key)
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}
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return nil
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})
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}
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func (m *LevelDbNeedleMap) Get(key NeedleId) (element *needle_map.NeedleValue, ok bool) {
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bytes := make([]byte, NeedleIdSize)
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NeedleIdToBytes(bytes[0:NeedleIdSize], key)
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data, err := m.db.Get(bytes, nil)
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if err != nil || len(data) != OffsetSize+SizeSize {
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return nil, false
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}
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offset := BytesToOffset(data[0:OffsetSize])
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size := util.BytesToUint32(data[OffsetSize : OffsetSize+SizeSize])
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return &needle_map.NeedleValue{Key: key, Offset: offset, Size: size}, true
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}
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func (m *LevelDbNeedleMap) Put(key NeedleId, offset Offset, size uint32) error {
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var oldSize uint32
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if oldNeedle, ok := m.Get(key); ok {
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oldSize = oldNeedle.Size
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}
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m.logPut(key, oldSize, size)
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// write to index file first
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if err := m.appendToIndexFile(key, offset, size); err != nil {
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return fmt.Errorf("cannot write to indexfile %s: %v", m.indexFile.Name(), err)
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}
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return levelDbWrite(m.db, key, offset, size)
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}
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func levelDbWrite(db *leveldb.DB,
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key NeedleId, offset Offset, size uint32) error {
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bytes := make([]byte, NeedleIdSize+OffsetSize+SizeSize)
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NeedleIdToBytes(bytes[0:NeedleIdSize], key)
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OffsetToBytes(bytes[NeedleIdSize:NeedleIdSize+OffsetSize], offset)
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util.Uint32toBytes(bytes[NeedleIdSize+OffsetSize:NeedleIdSize+OffsetSize+SizeSize], size)
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if err := db.Put(bytes[0:NeedleIdSize], bytes[NeedleIdSize:NeedleIdSize+OffsetSize+SizeSize], nil); err != nil {
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return fmt.Errorf("failed to write leveldb: %v", err)
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}
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return nil
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}
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func levelDbDelete(db *leveldb.DB, key NeedleId) error {
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bytes := make([]byte, NeedleIdSize)
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NeedleIdToBytes(bytes, key)
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return db.Delete(bytes, nil)
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}
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func (m *LevelDbNeedleMap) Delete(key NeedleId, offset Offset) error {
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if oldNeedle, ok := m.Get(key); ok {
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m.logDelete(oldNeedle.Size)
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}
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// write to index file first
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if err := m.appendToIndexFile(key, offset, TombstoneFileSize); err != nil {
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return err
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}
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return levelDbDelete(m.db, key)
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}
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func (m *LevelDbNeedleMap) Close() {
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m.indexFile.Close()
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m.db.Close()
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}
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func (m *LevelDbNeedleMap) Destroy() error {
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m.Close()
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os.Remove(m.indexFile.Name())
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return os.RemoveAll(m.dbFileName)
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}
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