mirror of
https://github.com/seaweedfs/seaweedfs.git
synced 2024-01-19 02:48:24 +00:00
290 lines
8.5 KiB
Go
290 lines
8.5 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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"time"
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"github.com/chrislusf/seaweedfs/weed/glog"
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"github.com/chrislusf/seaweedfs/weed/storage/needle"
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. "github.com/chrislusf/seaweedfs/weed/storage/types"
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)
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var ErrorNotFound = errors.New("not found")
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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.Needle) bool {
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if v.Ttl.String() != "" {
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return false
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}
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nv, ok := v.nm.Get(n.Id)
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if ok && !nv.Offset.IsZero() && nv.Size != TombstoneFileSize {
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oldNeedle := new(needle.Needle)
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err := oldNeedle.ReadData(v.dataFile, nv.Offset.ToAcutalOffset(), nv.Size, v.Version())
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if err != nil {
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glog.V(0).Infof("Failed to check updated file at offset %d size %d: %v", nv.Offset.ToAcutalOffset(), nv.Size, err)
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return false
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}
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if oldNeedle.Cookie == n.Cookie && 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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os.Remove(v.FileName() + ".dat")
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os.Remove(v.FileName() + ".idx")
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os.Remove(v.FileName() + ".cpd")
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os.Remove(v.FileName() + ".cpx")
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os.Remove(v.FileName() + ".ldb")
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os.Remove(v.FileName() + ".bdb")
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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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_, err = v.dataFile.Write(b)
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return
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}
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func (v *Volume) writeNeedle(n *needle.Needle) (offset uint64, size uint32, isUnchanged bool, err error) {
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glog.V(4).Infof("writing needle %s", needle.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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isUnchanged = true
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return
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}
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if n.Ttl == needle.EMPTY_TTL && v.Ttl != needle.EMPTY_TTL {
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n.SetHasTtl()
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n.Ttl = v.Ttl
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}
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// check whether existing needle cookie matches
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nv, ok := v.nm.Get(n.Id)
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if ok {
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existingNeedle, _, _, existingNeedleReadErr := needle.ReadNeedleHeader(v.dataFile, v.Version(), nv.Offset.ToAcutalOffset())
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if existingNeedleReadErr != nil {
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err = fmt.Errorf("reading existing needle: %v", existingNeedleReadErr)
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return
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}
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if existingNeedle.Cookie != n.Cookie {
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glog.V(0).Infof("write cookie mismatch: existing %x, new %x", existingNeedle.Cookie, n.Cookie)
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err = fmt.Errorf("mismatching cookie %x", n.Cookie)
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return
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}
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}
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// append to dat file
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n.AppendAtNs = uint64(time.Now().UnixNano())
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if offset, size, _, err = n.Append(v.dataFile, v.Version()); err != nil {
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return
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}
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v.lastAppendAtNs = n.AppendAtNs
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// add to needle map
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if !ok || uint64(nv.Offset.ToAcutalOffset()) < offset {
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if err = v.nm.Put(n.Id, ToOffset(int64(offset)), 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.lastModifiedTsSeconds < n.LastModified {
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v.lastModifiedTsSeconds = n.LastModified
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}
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return
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}
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func (v *Volume) deleteNeedle(n *needle.Needle) (uint32, error) {
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glog.V(4).Infof("delete needle %s", needle.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 && nv.Size != TombstoneFileSize {
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size := nv.Size
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n.Data = nil
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n.AppendAtNs = uint64(time.Now().UnixNano())
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offset, _, _, err := n.Append(v.dataFile, v.Version())
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if err != nil {
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return size, err
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}
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v.lastAppendAtNs = n.AppendAtNs
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if err = v.nm.Delete(n.Id, ToOffset(int64(offset))); err != nil {
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return size, err
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}
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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.Needle) (int, error) {
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nv, ok := v.nm.Get(n.Id)
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if !ok || nv.Offset.IsZero() {
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v.compactingWg.Wait()
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nv, ok = v.nm.Get(n.Id)
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if !ok || nv.Offset.IsZero() {
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return -1, ErrorNotFound
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}
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}
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if nv.Size == TombstoneFileSize {
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return -1, errors.New("already deleted")
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}
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if nv.Size == 0 {
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return 0, nil
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}
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err := n.ReadData(v.dataFile, nv.Offset.ToAcutalOffset(), 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, ErrorNotFound
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}
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type VolumeFileScanner interface {
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VisitSuperBlock(SuperBlock) error
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ReadNeedleBody() bool
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VisitNeedle(n *needle.Needle, offset int64) error
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}
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func ScanVolumeFile(dirname string, collection string, id needle.VolumeId,
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needleMapKind NeedleMapType,
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volumeFileScanner VolumeFileScanner) (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 = volumeFileScanner.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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defer v.Close()
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version := v.Version()
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offset := int64(v.SuperBlock.BlockSize())
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return ScanVolumeFileFrom(version, v.dataFile, offset, volumeFileScanner)
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}
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func ScanVolumeFileFrom(version needle.Version, dataFile *os.File, offset int64, volumeFileScanner VolumeFileScanner) (err error) {
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n, _, rest, e := needle.ReadNeedleHeader(dataFile, version, offset)
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if e != nil {
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if e == io.EOF {
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return nil
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}
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return fmt.Errorf("cannot read %s at offset %d: %v", dataFile.Name(), offset, e)
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}
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for n != nil {
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if volumeFileScanner.ReadNeedleBody() {
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if _, err = n.ReadNeedleBody(dataFile, version, offset+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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}
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err := volumeFileScanner.VisitNeedle(n, offset)
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if err == io.EOF {
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return nil
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}
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if err != nil {
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glog.V(0).Infof("visit needle error: %v", err)
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return fmt.Errorf("visit needle error: %v", err)
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}
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offset += NeedleHeaderSize + rest
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glog.V(4).Infof("==> new entry offset %d", offset)
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if n, _, rest, err = needle.ReadNeedleHeader(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 at offset %d: %v", offset, 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 nil
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}
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func ScanVolumeFileNeedleFrom(version needle.Version, dataFile *os.File, offset int64, fn func(needleHeader, needleBody []byte, needleAppendAtNs uint64) error) (err error) {
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n, nh, rest, e := needle.ReadNeedleHeader(dataFile, version, offset)
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if e != nil {
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if e == io.EOF {
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return nil
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}
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return fmt.Errorf("cannot read %s at offset %d: %v", dataFile.Name(), offset, e)
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}
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for n != nil {
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var needleBody []byte
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if needleBody, err = n.ReadNeedleBody(dataFile, version, offset+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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err = fn(nh, needleBody, n.AppendAtNs)
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if err != nil {
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glog.V(0).Infof("visit needle error: %v", err)
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return
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}
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offset += NeedleHeaderSize + rest
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glog.V(4).Infof("==> new entry offset %d", offset)
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if n, nh, rest, err = needle.ReadNeedleHeader(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 at offset %d: %v", offset, 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 nil
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}
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