mirror of
https://github.com/chrislusf/seaweedfs
synced 2024-07-03 15:46:44 +02:00
236 lines
6.7 KiB
Go
236 lines
6.7 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/types"
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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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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 > 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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_, err = v.dataFile.Write(b)
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return
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}
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func (v *Volume) writeNeedle(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, Offset(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) deleteNeedle(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 && nv.Size != TombstoneFileSize {
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size := nv.Size
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offset, err := v.dataFile.Seek(0, 2)
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if err != nil {
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return size, err
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}
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if err := v.nm.Delete(n.Id, Offset(offset/NeedlePaddingSize)); 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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if nv.Size == TombstoneFileSize {
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return -1, errors.New("Already Deleted")
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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(v.SuperBlock.BlockSize())
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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+NeedleEntrySize, 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 + NeedleEntrySize + NeedleChecksumSize) % NeedlePaddingSize)
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n.Size = 0
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rest = int64(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 += NeedleEntrySize + 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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