mirror of
https://github.com/seaweedfs/seaweedfs.git
synced 2024-12-02 08:36:57 +08:00
426 lines
12 KiB
Go
426 lines
12 KiB
Go
package storage
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import (
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"bytes"
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"errors"
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"fmt"
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"io"
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"os"
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"path"
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"sync"
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"time"
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"github.com/chrislusf/seaweedfs/go/glog"
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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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Collection string
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dataFile *os.File
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nm NeedleMapper
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needleMapKind NeedleMapType
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readOnly bool
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SuperBlock
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dataFileAccessLock sync.Mutex
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lastModifiedTime uint64 //unix time in seconds
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}
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func NewVolume(dirname string, collection string, id VolumeId, needleMapKind NeedleMapType, replicaPlacement *ReplicaPlacement, ttl *TTL) (v *Volume, e error) {
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v = &Volume{dir: dirname, Collection: collection, Id: id}
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v.SuperBlock = SuperBlock{ReplicaPlacement: replicaPlacement, Ttl: ttl}
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v.needleMapKind = needleMapKind
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e = v.load(true, true, needleMapKind)
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return
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}
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func (v *Volume) String() string {
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return fmt.Sprintf("Id:%v, dir:%s, Collection:%s, dataFile:%v, nm:%v, readOnly:%v", v.Id, v.dir, v.Collection, v.dataFile, v.nm, v.readOnly)
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}
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func loadVolumeWithoutIndex(dirname string, collection string, id VolumeId, needleMapKind NeedleMapType) (v *Volume, e error) {
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v = &Volume{dir: dirname, Collection: collection, Id: id}
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v.SuperBlock = SuperBlock{}
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v.needleMapKind = needleMapKind
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e = v.load(false, false, needleMapKind)
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return
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}
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func (v *Volume) FileName() (fileName string) {
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if v.Collection == "" {
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fileName = path.Join(v.dir, v.Id.String())
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} else {
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fileName = path.Join(v.dir, v.Collection+"_"+v.Id.String())
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}
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return
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}
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func (v *Volume) DataFile() *os.File {
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return v.dataFile
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}
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func (v *Volume) load(alsoLoadIndex bool, createDatIfMissing bool, needleMapKind NeedleMapType) error {
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var e error
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fileName := v.FileName()
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if exists, canRead, canWrite, modifiedTime := checkFile(fileName + ".dat"); exists {
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if !canRead {
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return fmt.Errorf("cannot read Volume Data file %s.dat", fileName)
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}
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if canWrite {
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v.dataFile, e = os.OpenFile(fileName+".dat", os.O_RDWR|os.O_CREATE, 0644)
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v.lastModifiedTime = uint64(modifiedTime.Unix())
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} else {
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glog.V(0).Infoln("opening " + fileName + ".dat in READONLY mode")
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v.dataFile, e = os.Open(fileName + ".dat")
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v.readOnly = true
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}
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} else {
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if createDatIfMissing {
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v.dataFile, e = os.OpenFile(fileName+".dat", os.O_RDWR|os.O_CREATE, 0644)
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} else {
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return fmt.Errorf("Volume Data file %s.dat does not exist.", fileName)
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}
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}
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if e != nil {
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if !os.IsPermission(e) {
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return fmt.Errorf("cannot load Volume Data %s.dat: %v", fileName, e)
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}
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}
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if v.ReplicaPlacement == nil {
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e = v.readSuperBlock()
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} else {
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e = v.maybeWriteSuperBlock()
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}
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if e == nil && alsoLoadIndex {
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var indexFile *os.File
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if v.readOnly {
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glog.V(1).Infoln("open to read file", fileName+".idx")
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if indexFile, e = os.OpenFile(fileName+".idx", os.O_RDONLY, 0644); e != nil {
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return fmt.Errorf("cannot read Volume Index %s.idx: %v", fileName, e)
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}
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} else {
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glog.V(1).Infoln("open to write file", fileName+".idx")
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if indexFile, e = os.OpenFile(fileName+".idx", os.O_RDWR|os.O_CREATE, 0644); e != nil {
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return fmt.Errorf("cannot write Volume Index %s.idx: %v", fileName, e)
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}
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}
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switch needleMapKind {
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case NeedleMapInMemory:
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glog.V(0).Infoln("loading index file", fileName+".idx", "readonly", v.readOnly)
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if v.nm, e = LoadNeedleMap(indexFile); e != nil {
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glog.V(0).Infof("loading index %s error: %v", fileName+".idx", e)
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}
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case NeedleMapLevelDb:
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glog.V(0).Infoln("loading leveldb file", fileName+".ldb")
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if v.nm, e = NewLevelDbNeedleMap(fileName+".ldb", indexFile); e != nil {
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glog.V(0).Infof("loading leveldb %s error: %v", fileName+".ldb", e)
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}
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case NeedleMapBoltDb:
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glog.V(0).Infoln("loading boltdb file", fileName+".bdb")
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if v.nm, e = NewBoltDbNeedleMap(fileName+".bdb", indexFile); e != nil {
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glog.V(0).Infof("loading boltdb %s error: %v", fileName+".bdb", e)
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}
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}
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}
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return e
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}
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func (v *Volume) Version() Version {
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return v.SuperBlock.Version()
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}
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func (v *Volume) Size() int64 {
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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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glog.V(0).Infof("Failed to read file size %s %v", v.dataFile.Name(), e)
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return -1
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}
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// Close cleanly shuts down this volume
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func (v *Volume) Close() {
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v.dataFileAccessLock.Lock()
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defer v.dataFileAccessLock.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) NeedToReplicate() bool {
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return v.ReplicaPlacement.GetCopyCount() > 1
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}
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// isFileUnchanged checks whether this needle to write is same as last one.
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// It requires serialized access in the same volume.
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func (v *Volume) isFileUnchanged(n *Needle) bool {
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nv, ok := v.nm.Get(n.Id)
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if ok && nv.Offset > 0 {
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oldNeedle := new(Needle)
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err := oldNeedle.ReadData(v.dataFile, int64(nv.Offset)*NeedlePaddingSize, nv.Size, v.Version())
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if err != nil {
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glog.V(0).Infof("Failed to check updated file %v", err)
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return false
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}
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if oldNeedle.Checksum == n.Checksum && bytes.Equal(oldNeedle.Data, n.Data) {
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n.DataSize = oldNeedle.DataSize
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return true
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}
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}
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return false
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}
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// Destroy removes everything related to this volume
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func (v *Volume) Destroy() (err error) {
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if v.readOnly {
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err = fmt.Errorf("%s is read-only", v.dataFile.Name())
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return
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}
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v.Close()
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err = os.Remove(v.dataFile.Name())
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if err != nil {
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return
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}
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err = v.nm.Destroy()
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return
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}
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// AppendBlob append a blob to end of the data file, used in replication
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func (v *Volume) AppendBlob(b []byte) (offset int64, err error) {
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if v.readOnly {
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err = fmt.Errorf("%s is read-only", v.dataFile.Name())
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return
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}
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v.dataFileAccessLock.Lock()
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defer v.dataFileAccessLock.Unlock()
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if offset, err = v.dataFile.Seek(0, 2); err != nil {
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glog.V(0).Infof("failed to seek the end of file: %v", err)
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return
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}
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//ensure file writing starting from aligned positions
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if offset%NeedlePaddingSize != 0 {
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offset = offset + (NeedlePaddingSize - offset%NeedlePaddingSize)
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if offset, err = v.dataFile.Seek(offset, 0); err != nil {
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glog.V(0).Infof("failed to align in datafile %s: %v", v.dataFile.Name(), err)
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return
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}
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}
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v.dataFile.Write(b)
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return
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}
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func (v *Volume) write(n *Needle) (size uint32, err error) {
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glog.V(4).Infof("writing needle %s", NewFileIdFromNeedle(v.Id, n).String())
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if v.readOnly {
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err = fmt.Errorf("%s is read-only", v.dataFile.Name())
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return
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}
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v.dataFileAccessLock.Lock()
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defer v.dataFileAccessLock.Unlock()
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if v.isFileUnchanged(n) {
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size = n.DataSize
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glog.V(4).Infof("needle is unchanged!")
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return
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}
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var offset int64
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if offset, err = v.dataFile.Seek(0, 2); err != nil {
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glog.V(0).Infof("failed to seek the end of file: %v", err)
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return
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}
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//ensure file writing starting from aligned positions
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if offset%NeedlePaddingSize != 0 {
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offset = offset + (NeedlePaddingSize - offset%NeedlePaddingSize)
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if offset, err = v.dataFile.Seek(offset, 0); err != nil {
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glog.V(0).Infof("failed to align in datafile %s: %v", v.dataFile.Name(), err)
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return
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}
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}
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if size, err = n.Append(v.dataFile, v.Version()); err != nil {
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if e := v.dataFile.Truncate(offset); e != nil {
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err = fmt.Errorf("%s\ncannot truncate %s: %v", err, v.dataFile.Name(), e)
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}
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return
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}
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nv, ok := v.nm.Get(n.Id)
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if !ok || int64(nv.Offset)*NeedlePaddingSize < offset {
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if err = v.nm.Put(n.Id, uint32(offset/NeedlePaddingSize), n.Size); err != nil {
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glog.V(4).Infof("failed to save in needle map %d: %v", n.Id, err)
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}
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}
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if v.lastModifiedTime < n.LastModified {
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v.lastModifiedTime = n.LastModified
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}
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return
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}
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func (v *Volume) delete(n *Needle) (uint32, error) {
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glog.V(4).Infof("delete needle %s", NewFileIdFromNeedle(v.Id, n).String())
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if v.readOnly {
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return 0, fmt.Errorf("%s is read-only", v.dataFile.Name())
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}
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v.dataFileAccessLock.Lock()
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defer v.dataFileAccessLock.Unlock()
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nv, ok := v.nm.Get(n.Id)
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//fmt.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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size := nv.Size
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if err := v.nm.Delete(n.Id); err != nil {
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return size, err
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}
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if _, err := v.dataFile.Seek(0, 2); err != nil {
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return size, err
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}
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n.Data = nil
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_, err := n.Append(v.dataFile, v.Version())
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return size, err
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}
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return 0, nil
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}
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// read fills in Needle content by looking up n.Id from NeedleMapper
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func (v *Volume) readNeedle(n *Needle) (int, error) {
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nv, ok := v.nm.Get(n.Id)
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if !ok || nv.Offset == 0 {
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return -1, errors.New("Not Found")
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}
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err := n.ReadData(v.dataFile, int64(nv.Offset)*NeedlePaddingSize, nv.Size, v.Version())
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if err != nil {
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return 0, err
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}
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bytesRead := len(n.Data)
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if !n.HasTtl() {
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return bytesRead, nil
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}
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ttlMinutes := n.Ttl.Minutes()
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if ttlMinutes == 0 {
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return bytesRead, nil
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}
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if !n.HasLastModifiedDate() {
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return bytesRead, nil
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}
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if uint64(time.Now().Unix()) < n.LastModified+uint64(ttlMinutes*60) {
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return bytesRead, nil
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}
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return -1, errors.New("Not Found")
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}
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func ScanVolumeFile(dirname string, collection string, id VolumeId,
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needleMapKind NeedleMapType,
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visitSuperBlock func(SuperBlock) error,
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readNeedleBody bool,
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visitNeedle func(n *Needle, offset int64) error) (err error) {
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var v *Volume
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if v, err = loadVolumeWithoutIndex(dirname, collection, id, needleMapKind); err != nil {
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return fmt.Errorf("Failed to load volume %d: %v", id, err)
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}
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if err = visitSuperBlock(v.SuperBlock); err != nil {
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return fmt.Errorf("Failed to process volume %d super block: %v", id, err)
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}
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version := v.Version()
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offset := int64(SuperBlockSize)
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n, rest, e := ReadNeedleHeader(v.dataFile, version, offset)
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if e != nil {
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err = fmt.Errorf("cannot read needle header: %v", e)
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return
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}
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for n != nil {
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if readNeedleBody {
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if err = n.ReadNeedleBody(v.dataFile, version, offset+int64(NeedleHeaderSize), rest); err != nil {
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glog.V(0).Infof("cannot read needle body: %v", err)
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//err = fmt.Errorf("cannot read needle body: %v", err)
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//return
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}
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if n.DataSize >= n.Size {
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// this should come from a bug reported on #87 and #93
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// fixed in v0.69
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// remove this whole "if" clause later, long after 0.69
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oldRest, oldSize := rest, n.Size
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padding := NeedlePaddingSize - ((n.Size + NeedleHeaderSize + NeedleChecksumSize) % NeedlePaddingSize)
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n.Size = 0
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rest = n.Size + NeedleChecksumSize + padding
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if rest%NeedlePaddingSize != 0 {
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rest += (NeedlePaddingSize - rest%NeedlePaddingSize)
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}
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glog.V(4).Infof("Adjusting n.Size %d=>0 rest:%d=>%d %+v", oldSize, oldRest, rest, n)
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}
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}
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if err = visitNeedle(n, offset); err != nil {
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glog.V(0).Infof("visit needle error: %v", err)
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}
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offset += int64(NeedleHeaderSize) + int64(rest)
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glog.V(4).Infof("==> new entry offset %d", offset)
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if n, rest, err = ReadNeedleHeader(v.dataFile, version, offset); err != nil {
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if err == io.EOF {
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return nil
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}
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return fmt.Errorf("cannot read needle header: %v", err)
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}
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glog.V(4).Infof("new entry needle size:%d rest:%d", n.Size, rest)
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}
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return
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}
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func (v *Volume) ContentSize() uint64 {
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return v.nm.ContentSize()
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}
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func checkFile(filename string) (exists, canRead, canWrite bool, modTime time.Time) {
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exists = true
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fi, err := os.Stat(filename)
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if os.IsNotExist(err) {
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exists = false
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return
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}
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if fi.Mode()&0400 != 0 {
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canRead = true
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}
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if fi.Mode()&0200 != 0 {
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canWrite = true
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}
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modTime = fi.ModTime()
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return
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}
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// volume is expired if modified time + volume ttl < now
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// except when volume is empty
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// or when the volume does not have a ttl
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// or when volumeSizeLimit is 0 when server just starts
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func (v *Volume) expired(volumeSizeLimit uint64) bool {
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if volumeSizeLimit == 0 {
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//skip if we don't know size limit
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return false
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}
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if v.ContentSize() == 0 {
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return false
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}
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if v.Ttl == nil || v.Ttl.Minutes() == 0 {
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return false
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}
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glog.V(0).Infof("now:%v lastModified:%v", time.Now().Unix(), v.lastModifiedTime)
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livedMinutes := (time.Now().Unix() - int64(v.lastModifiedTime)) / 60
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glog.V(0).Infof("ttl:%v lived:%v", v.Ttl, livedMinutes)
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if int64(v.Ttl.Minutes()) < livedMinutes {
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return true
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}
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return false
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}
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// wait either maxDelayMinutes or 10% of ttl minutes
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func (v *Volume) exiredLongEnough(maxDelayMinutes uint32) bool {
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if v.Ttl == nil || v.Ttl.Minutes() == 0 {
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return false
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}
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removalDelay := v.Ttl.Minutes() / 10
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if removalDelay > maxDelayMinutes {
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removalDelay = maxDelayMinutes
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}
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if uint64(v.Ttl.Minutes()+removalDelay)*60+v.lastModifiedTime < uint64(time.Now().Unix()) {
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return true
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}
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return false
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}
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