2011-12-16 14:51:26 +00:00
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package storage
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import (
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2012-11-07 09:51:43 +00:00
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"errors"
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"fmt"
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"os"
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"path"
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"sync"
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2011-12-16 14:51:26 +00:00
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)
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2012-11-21 18:52:08 +00:00
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type Version uint8
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const (
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SuperBlockSize = 8
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CurrentVersion = Version(1)
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)
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type Volume struct {
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Id VolumeId
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dir string
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dataFile *os.File
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nm *NeedleMap
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replicaType ReplicationType
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version Version
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accessLock sync.Mutex
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}
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2012-09-11 00:08:52 +00:00
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func NewVolume(dirname string, id VolumeId, replicationType ReplicationType) (v *Volume) {
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v = &Volume{dir: dirname, Id: id, replicaType: replicationType}
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v.load()
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return
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}
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func (v *Volume) load() error {
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var e error
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fileName := path.Join(v.dir, v.Id.String())
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v.dataFile, e = os.OpenFile(fileName+".dat", os.O_RDWR|os.O_CREATE, 0644)
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if e != nil {
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return fmt.Errorf("cannot create Volume Data %s.dat: %s", fileName, e)
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}
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if v.replicaType == CopyNil {
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if e = v.readSuperBlock(); e != nil {
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return e
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}
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} else {
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v.maybeWriteSuperBlock()
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}
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indexFile, ie := os.OpenFile(fileName+".idx", os.O_RDWR|os.O_CREATE, 0644)
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if ie != nil {
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return fmt.Errorf("cannot create Volume Data %s.dat: %s", fileName, e)
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}
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v.nm = LoadNeedleMap(indexFile)
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return nil
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}
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2011-12-18 07:22:04 +00:00
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func (v *Volume) Size() int64 {
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v.accessLock.Lock()
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defer v.accessLock.Unlock()
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stat, e := v.dataFile.Stat()
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if e == nil {
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return stat.Size()
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}
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fmt.Printf("Failed to read file size %s %s\n", v.dataFile.Name(), e.Error())
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return -1
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}
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func (v *Volume) Close() {
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v.accessLock.Lock()
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defer v.accessLock.Unlock()
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v.nm.Close()
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v.dataFile.Close()
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}
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func (v *Volume) maybeWriteSuperBlock() {
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stat, _ := v.dataFile.Stat()
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if stat.Size() == 0 {
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header := make([]byte, SuperBlockSize)
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header[0] = byte(CurrentVersion)
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header[1] = v.replicaType.Byte()
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v.dataFile.Write(header)
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}
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}
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func (v *Volume) readSuperBlock() error {
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v.dataFile.Seek(0, 0)
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header := make([]byte, SuperBlockSize)
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if _, e := v.dataFile.Read(header); e != nil {
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return fmt.Errorf("cannot read superblock: %s", e)
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}
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v.version = Version(header[0])
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var err error
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if v.replicaType, err = NewReplicationTypeFromByte(header[1]); err != nil {
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return fmt.Errorf("cannot read replica type: %s", err)
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}
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return nil
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}
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func (v *Volume) NeedToReplicate() bool {
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return v.replicaType.GetCopyCount() > 1
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}
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func (v *Volume) write(n *Needle) uint32 {
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v.accessLock.Lock()
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defer v.accessLock.Unlock()
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offset, _ := v.dataFile.Seek(0, 2)
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ret := n.Append(v.dataFile)
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nv, ok := v.nm.Get(n.Id)
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if !ok || int64(nv.Offset)*8 < offset {
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v.nm.Put(n.Id, uint32(offset/8), n.Size)
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}
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return ret
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}
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func (v *Volume) delete(n *Needle) uint32 {
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v.accessLock.Lock()
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defer v.accessLock.Unlock()
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nv, ok := v.nm.Get(n.Id)
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//log.Println("key", n.Id, "volume offset", nv.Offset, "data_size", n.Size, "cached size", nv.Size)
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if ok {
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v.nm.Delete(n.Id)
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v.dataFile.Seek(int64(nv.Offset*8), 0)
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n.Append(v.dataFile)
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return nv.Size
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}
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return 0
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}
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2012-06-29 07:53:47 +00:00
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func (v *Volume) read(n *Needle) (int, error) {
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v.accessLock.Lock()
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defer v.accessLock.Unlock()
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nv, ok := v.nm.Get(n.Id)
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if ok && nv.Offset > 0 {
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v.dataFile.Seek(int64(nv.Offset)*8, 0)
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return n.Read(v.dataFile, nv.Size, v.version)
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}
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return -1, errors.New("Not Found")
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}
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func (v *Volume) garbageLevel() float64 {
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return float64(v.nm.deletionByteCounter)/float64(v.Size())
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}
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func (v *Volume) compact() error {
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v.accessLock.Lock()
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defer v.accessLock.Unlock()
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filePath := path.Join(v.dir, v.Id.String())
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return v.copyDataAndGenerateIndexFile(filePath+".dat", filePath+".cpd", filePath+".cpx")
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}
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func (v *Volume) commitCompact() (error) {
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v.accessLock.Lock()
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defer v.accessLock.Unlock()
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v.dataFile.Close()
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var e error
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if e = os.Rename(path.Join(v.dir, v.Id.String()+".cpd"), path.Join(v.dir, v.Id.String()+".dat")); e != nil {
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return e
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}
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if e = os.Rename(path.Join(v.dir, v.Id.String()+".cpx"), path.Join(v.dir, v.Id.String()+".idx")); e != nil {
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return e
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}
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if e = v.load(); e != nil {
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return e
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}
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return nil
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2012-11-07 09:51:43 +00:00
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}
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func (v *Volume) copyDataAndGenerateIndexFile(srcName, dstName, idxName string) (err error) {
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src, err := os.OpenFile(srcName, os.O_RDONLY, 0644)
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if err != nil {
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return err
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}
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defer src.Close()
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dst, err := os.OpenFile(dstName, os.O_WRONLY|os.O_CREATE, 0644)
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if err != nil {
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return err
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}
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defer dst.Close()
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idx, err := os.OpenFile(idxName, os.O_WRONLY|os.O_CREATE, 0644)
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if err != nil {
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return err
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}
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defer idx.Close()
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src.Seek(0, 0)
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header := make([]byte, SuperBlockSize)
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if _, error := src.Read(header); error == nil {
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dst.Write(header)
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}
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n, rest := ReadNeedle(src)
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nm := NewNeedleMap(idx)
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old_offset := uint32(SuperBlockSize)
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new_offset := uint32(SuperBlockSize)
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for n != nil {
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nv, ok := v.nm.Get(n.Id)
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//log.Println("file size is", n.Size, "rest", rest)
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if !ok || nv.Offset*8 != old_offset {
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src.Seek(int64(rest), 1)
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} else {
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if nv.Size > 0 {
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nm.Put(n.Id, new_offset/8, n.Size)
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bytes := make([]byte, n.Size+4)
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src.Read(bytes)
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n.Data = bytes[:n.Size]
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n.Checksum = NewCRC(n.Data)
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n.Append(dst)
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new_offset += rest + 16
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//log.Println("saving key", n.Id, "volume offset", old_offset, "=>", new_offset, "data_size", n.Size, "rest", rest)
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}
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src.Seek(int64(rest-n.Size-4), 1)
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}
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old_offset += rest + 16
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n, rest = ReadNeedle(src)
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}
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return nil
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}
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