aboutsummaryrefslogtreecommitdiff
path: root/go/storage/volume.go
diff options
context:
space:
mode:
Diffstat (limited to 'go/storage/volume.go')
-rw-r--r--go/storage/volume.go430
1 files changed, 0 insertions, 430 deletions
diff --git a/go/storage/volume.go b/go/storage/volume.go
deleted file mode 100644
index 7e330a9e4..000000000
--- a/go/storage/volume.go
+++ /dev/null
@@ -1,430 +0,0 @@
-package storage
-
-import (
- "bytes"
- "errors"
- "fmt"
- "io"
- "os"
- "path"
- "sync"
- "time"
-
- "github.com/chrislusf/seaweedfs/go/glog"
-)
-
-type Volume struct {
- Id VolumeId
- dir string
- Collection string
- dataFile *os.File
- nm NeedleMapper
- needleMapKind NeedleMapType
- readOnly bool
-
- SuperBlock
-
- dataFileAccessLock sync.Mutex
- lastModifiedTime uint64 //unix time in seconds
-}
-
-func NewVolume(dirname string, collection string, id VolumeId, needleMapKind NeedleMapType, replicaPlacement *ReplicaPlacement, ttl *TTL) (v *Volume, e error) {
- v = &Volume{dir: dirname, Collection: collection, Id: id}
- v.SuperBlock = SuperBlock{ReplicaPlacement: replicaPlacement, Ttl: ttl}
- v.needleMapKind = needleMapKind
- e = v.load(true, true, needleMapKind)
- return
-}
-func (v *Volume) String() string {
- 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)
-}
-
-func loadVolumeWithoutIndex(dirname string, collection string, id VolumeId, needleMapKind NeedleMapType) (v *Volume, e error) {
- v = &Volume{dir: dirname, Collection: collection, Id: id}
- v.SuperBlock = SuperBlock{}
- v.needleMapKind = needleMapKind
- e = v.load(false, false, needleMapKind)
- return
-}
-func (v *Volume) FileName() (fileName string) {
- if v.Collection == "" {
- fileName = path.Join(v.dir, v.Id.String())
- } else {
- fileName = path.Join(v.dir, v.Collection+"_"+v.Id.String())
- }
- return
-}
-func (v *Volume) DataFile() *os.File {
- return v.dataFile
-}
-func (v *Volume) load(alsoLoadIndex bool, createDatIfMissing bool, needleMapKind NeedleMapType) error {
- var e error
- fileName := v.FileName()
-
- if exists, canRead, canWrite, modifiedTime := checkFile(fileName + ".dat"); exists {
- if !canRead {
- return fmt.Errorf("cannot read Volume Data file %s.dat", fileName)
- }
- if canWrite {
- v.dataFile, e = os.OpenFile(fileName+".dat", os.O_RDWR|os.O_CREATE, 0644)
- v.lastModifiedTime = uint64(modifiedTime.Unix())
- } else {
- glog.V(0).Infoln("opening " + fileName + ".dat in READONLY mode")
- v.dataFile, e = os.Open(fileName + ".dat")
- v.readOnly = true
- }
- } else {
- if createDatIfMissing {
- v.dataFile, e = os.OpenFile(fileName+".dat", os.O_RDWR|os.O_CREATE, 0644)
- } else {
- return fmt.Errorf("Volume Data file %s.dat does not exist.", fileName)
- }
- }
-
- if e != nil {
- if !os.IsPermission(e) {
- return fmt.Errorf("cannot load Volume Data %s.dat: %v", fileName, e)
- }
- }
-
- if v.ReplicaPlacement == nil {
- e = v.readSuperBlock()
- } else {
- e = v.maybeWriteSuperBlock()
- }
- if e == nil && alsoLoadIndex {
- var indexFile *os.File
- if v.readOnly {
- glog.V(1).Infoln("open to read file", fileName+".idx")
- if indexFile, e = os.OpenFile(fileName+".idx", os.O_RDONLY, 0644); e != nil {
- return fmt.Errorf("cannot read Volume Index %s.idx: %v", fileName, e)
- }
- } else {
- glog.V(1).Infoln("open to write file", fileName+".idx")
- if indexFile, e = os.OpenFile(fileName+".idx", os.O_RDWR|os.O_CREATE, 0644); e != nil {
- return fmt.Errorf("cannot write Volume Index %s.idx: %v", fileName, e)
- }
- }
- switch needleMapKind {
- case NeedleMapInMemory:
- glog.V(0).Infoln("loading index file", fileName+".idx", "readonly", v.readOnly)
- if v.nm, e = LoadNeedleMap(indexFile); e != nil {
- glog.V(0).Infof("loading index %s error: %v", fileName+".idx", e)
- }
- case NeedleMapLevelDb:
- glog.V(0).Infoln("loading leveldb file", fileName+".ldb")
- if v.nm, e = NewLevelDbNeedleMap(fileName+".ldb", indexFile); e != nil {
- glog.V(0).Infof("loading leveldb %s error: %v", fileName+".ldb", e)
- }
- case NeedleMapBoltDb:
- glog.V(0).Infoln("loading boltdb file", fileName+".bdb")
- if v.nm, e = NewBoltDbNeedleMap(fileName+".bdb", indexFile); e != nil {
- glog.V(0).Infof("loading boltdb %s error: %v", fileName+".bdb", e)
- }
- }
- }
- return e
-}
-func (v *Volume) Version() Version {
- return v.SuperBlock.Version()
-}
-func (v *Volume) Size() int64 {
- stat, e := v.dataFile.Stat()
- if e == nil {
- return stat.Size()
- }
- glog.V(0).Infof("Failed to read file size %s %v", v.dataFile.Name(), e)
- return -1
-}
-
-// Close cleanly shuts down this volume
-func (v *Volume) Close() {
- v.dataFileAccessLock.Lock()
- defer v.dataFileAccessLock.Unlock()
- v.nm.Close()
- _ = v.dataFile.Close()
-}
-
-func (v *Volume) NeedToReplicate() bool {
- return v.ReplicaPlacement.GetCopyCount() > 1
-}
-
-// isFileUnchanged checks whether this needle to write is same as last one.
-// It requires serialized access in the same volume.
-func (v *Volume) isFileUnchanged(n *Needle) bool {
- if v.Ttl.String() != "" {
- return false
- }
- nv, ok := v.nm.Get(n.Id)
- if ok && nv.Offset > 0 {
- oldNeedle := new(Needle)
- err := oldNeedle.ReadData(v.dataFile, int64(nv.Offset)*NeedlePaddingSize, nv.Size, v.Version())
- if err != nil {
- glog.V(0).Infof("Failed to check updated file %v", err)
- return false
- }
- defer oldNeedle.ReleaseMemory()
- if oldNeedle.Checksum == n.Checksum && bytes.Equal(oldNeedle.Data, n.Data) {
- n.DataSize = oldNeedle.DataSize
- return true
- }
- }
- return false
-}
-
-// Destroy removes everything related to this volume
-func (v *Volume) Destroy() (err error) {
- if v.readOnly {
- err = fmt.Errorf("%s is read-only", v.dataFile.Name())
- return
- }
- v.Close()
- err = os.Remove(v.dataFile.Name())
- if err != nil {
- return
- }
- err = v.nm.Destroy()
- return
-}
-
-// AppendBlob append a blob to end of the data file, used in replication
-func (v *Volume) AppendBlob(b []byte) (offset int64, err error) {
- if v.readOnly {
- err = fmt.Errorf("%s is read-only", v.dataFile.Name())
- return
- }
- v.dataFileAccessLock.Lock()
- defer v.dataFileAccessLock.Unlock()
- if offset, err = v.dataFile.Seek(0, 2); err != nil {
- glog.V(0).Infof("failed to seek the end of file: %v", err)
- return
- }
- //ensure file writing starting from aligned positions
- if offset%NeedlePaddingSize != 0 {
- offset = offset + (NeedlePaddingSize - offset%NeedlePaddingSize)
- if offset, err = v.dataFile.Seek(offset, 0); err != nil {
- glog.V(0).Infof("failed to align in datafile %s: %v", v.dataFile.Name(), err)
- return
- }
- }
- v.dataFile.Write(b)
- return
-}
-
-func (v *Volume) write(n *Needle) (size uint32, err error) {
- glog.V(4).Infof("writing needle %s", NewFileIdFromNeedle(v.Id, n).String())
- if v.readOnly {
- err = fmt.Errorf("%s is read-only", v.dataFile.Name())
- return
- }
- v.dataFileAccessLock.Lock()
- defer v.dataFileAccessLock.Unlock()
- if v.isFileUnchanged(n) {
- size = n.DataSize
- glog.V(4).Infof("needle is unchanged!")
- return
- }
- var offset int64
- if offset, err = v.dataFile.Seek(0, 2); err != nil {
- glog.V(0).Infof("failed to seek the end of file: %v", err)
- return
- }
-
- //ensure file writing starting from aligned positions
- if offset%NeedlePaddingSize != 0 {
- offset = offset + (NeedlePaddingSize - offset%NeedlePaddingSize)
- if offset, err = v.dataFile.Seek(offset, 0); err != nil {
- glog.V(0).Infof("failed to align in datafile %s: %v", v.dataFile.Name(), err)
- return
- }
- }
-
- if size, err = n.Append(v.dataFile, v.Version()); err != nil {
- if e := v.dataFile.Truncate(offset); e != nil {
- err = fmt.Errorf("%s\ncannot truncate %s: %v", err, v.dataFile.Name(), e)
- }
- return
- }
- nv, ok := v.nm.Get(n.Id)
- if !ok || int64(nv.Offset)*NeedlePaddingSize < offset {
- if err = v.nm.Put(n.Id, uint32(offset/NeedlePaddingSize), n.Size); err != nil {
- glog.V(4).Infof("failed to save in needle map %d: %v", n.Id, err)
- }
- }
- if v.lastModifiedTime < n.LastModified {
- v.lastModifiedTime = n.LastModified
- }
- return
-}
-
-func (v *Volume) delete(n *Needle) (uint32, error) {
- glog.V(4).Infof("delete needle %s", NewFileIdFromNeedle(v.Id, n).String())
- if v.readOnly {
- return 0, fmt.Errorf("%s is read-only", v.dataFile.Name())
- }
- v.dataFileAccessLock.Lock()
- defer v.dataFileAccessLock.Unlock()
- nv, ok := v.nm.Get(n.Id)
- //fmt.Println("key", n.Id, "volume offset", nv.Offset, "data_size", n.Size, "cached size", nv.Size)
- if ok {
- size := nv.Size
- if err := v.nm.Delete(n.Id); err != nil {
- return size, err
- }
- if _, err := v.dataFile.Seek(0, 2); err != nil {
- return size, err
- }
- n.Data = nil
- _, err := n.Append(v.dataFile, v.Version())
- return size, err
- }
- return 0, nil
-}
-
-// read fills in Needle content by looking up n.Id from NeedleMapper
-func (v *Volume) readNeedle(n *Needle) (int, error) {
- nv, ok := v.nm.Get(n.Id)
- if !ok || nv.Offset == 0 {
- return -1, errors.New("Not Found")
- }
- err := n.ReadData(v.dataFile, int64(nv.Offset)*NeedlePaddingSize, nv.Size, v.Version())
- if err != nil {
- return 0, err
- }
- bytesRead := len(n.Data)
- if !n.HasTtl() {
- return bytesRead, nil
- }
- ttlMinutes := n.Ttl.Minutes()
- if ttlMinutes == 0 {
- return bytesRead, nil
- }
- if !n.HasLastModifiedDate() {
- return bytesRead, nil
- }
- if uint64(time.Now().Unix()) < n.LastModified+uint64(ttlMinutes*60) {
- return bytesRead, nil
- }
- n.ReleaseMemory()
- return -1, errors.New("Not Found")
-}
-
-func ScanVolumeFile(dirname string, collection string, id VolumeId,
- needleMapKind NeedleMapType,
- visitSuperBlock func(SuperBlock) error,
- readNeedleBody bool,
- visitNeedle func(n *Needle, offset int64) error) (err error) {
- var v *Volume
- if v, err = loadVolumeWithoutIndex(dirname, collection, id, needleMapKind); err != nil {
- return fmt.Errorf("Failed to load volume %d: %v", id, err)
- }
- if err = visitSuperBlock(v.SuperBlock); err != nil {
- return fmt.Errorf("Failed to process volume %d super block: %v", id, err)
- }
-
- version := v.Version()
-
- offset := int64(SuperBlockSize)
- n, rest, e := ReadNeedleHeader(v.dataFile, version, offset)
- if e != nil {
- err = fmt.Errorf("cannot read needle header: %v", e)
- return
- }
- for n != nil {
- if readNeedleBody {
- if err = n.ReadNeedleBody(v.dataFile, version, offset+int64(NeedleHeaderSize), rest); err != nil {
- glog.V(0).Infof("cannot read needle body: %v", err)
- //err = fmt.Errorf("cannot read needle body: %v", err)
- //return
- }
- if n.DataSize >= n.Size {
- // this should come from a bug reported on #87 and #93
- // fixed in v0.69
- // remove this whole "if" clause later, long after 0.69
- oldRest, oldSize := rest, n.Size
- padding := NeedlePaddingSize - ((n.Size + NeedleHeaderSize + NeedleChecksumSize) % NeedlePaddingSize)
- n.Size = 0
- rest = n.Size + NeedleChecksumSize + padding
- if rest%NeedlePaddingSize != 0 {
- rest += (NeedlePaddingSize - rest%NeedlePaddingSize)
- }
- glog.V(4).Infof("Adjusting n.Size %d=>0 rest:%d=>%d %+v", oldSize, oldRest, rest, n)
- }
- }
- if err = visitNeedle(n, offset); err != nil {
- glog.V(0).Infof("visit needle error: %v", err)
- }
- offset += int64(NeedleHeaderSize) + int64(rest)
- glog.V(4).Infof("==> new entry offset %d", offset)
- if n, rest, err = ReadNeedleHeader(v.dataFile, version, offset); err != nil {
- if err == io.EOF {
- return nil
- }
- return fmt.Errorf("cannot read needle header: %v", err)
- }
- glog.V(4).Infof("new entry needle size:%d rest:%d", n.Size, rest)
- }
-
- return
-}
-
-func (v *Volume) ContentSize() uint64 {
- return v.nm.ContentSize()
-}
-
-func checkFile(filename string) (exists, canRead, canWrite bool, modTime time.Time) {
- exists = true
- fi, err := os.Stat(filename)
- if os.IsNotExist(err) {
- exists = false
- return
- }
- if fi.Mode()&0400 != 0 {
- canRead = true
- }
- if fi.Mode()&0200 != 0 {
- canWrite = true
- }
- modTime = fi.ModTime()
- return
-}
-
-// volume is expired if modified time + volume ttl < now
-// except when volume is empty
-// or when the volume does not have a ttl
-// or when volumeSizeLimit is 0 when server just starts
-func (v *Volume) expired(volumeSizeLimit uint64) bool {
- if volumeSizeLimit == 0 {
- //skip if we don't know size limit
- return false
- }
- if v.ContentSize() == 0 {
- return false
- }
- if v.Ttl == nil || v.Ttl.Minutes() == 0 {
- return false
- }
- glog.V(0).Infof("now:%v lastModified:%v", time.Now().Unix(), v.lastModifiedTime)
- livedMinutes := (time.Now().Unix() - int64(v.lastModifiedTime)) / 60
- glog.V(0).Infof("ttl:%v lived:%v", v.Ttl, livedMinutes)
- if int64(v.Ttl.Minutes()) < livedMinutes {
- return true
- }
- return false
-}
-
-// wait either maxDelayMinutes or 10% of ttl minutes
-func (v *Volume) exiredLongEnough(maxDelayMinutes uint32) bool {
- if v.Ttl == nil || v.Ttl.Minutes() == 0 {
- return false
- }
- removalDelay := v.Ttl.Minutes() / 10
- if removalDelay > maxDelayMinutes {
- removalDelay = maxDelayMinutes
- }
-
- if uint64(v.Ttl.Minutes()+removalDelay)*60+v.lastModifiedTime < uint64(time.Now().Unix()) {
- return true
- }
- return false
-}
generated by cgit v1.2.3 (git 2.25.1) at 2025-12-21 21:53:48 +0000