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88 lines
3.0 KiB
88 lines
3.0 KiB
package storage
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import (
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"fmt"
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"os"
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"github.com/chrislusf/seaweedfs/weed/storage/backend"
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"github.com/chrislusf/seaweedfs/weed/storage/idx"
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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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"github.com/chrislusf/seaweedfs/weed/util"
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)
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func CheckVolumeDataIntegrity(v *Volume, indexFile *os.File) (lastAppendAtNs uint64, e error) {
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var indexSize int64
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if indexSize, e = verifyIndexFileIntegrity(indexFile); e != nil {
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return 0, fmt.Errorf("verifyIndexFileIntegrity %s failed: %v", indexFile.Name(), e)
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}
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if indexSize == 0 {
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return 0, nil
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}
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var lastIdxEntry []byte
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if lastIdxEntry, e = readIndexEntryAtOffset(indexFile, indexSize-NeedleMapEntrySize); e != nil {
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return 0, fmt.Errorf("readLastIndexEntry %s failed: %v", indexFile.Name(), e)
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}
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key, offset, size := idx.IdxFileEntry(lastIdxEntry)
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if offset.IsZero() {
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return 0, nil
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}
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if size < 0 {
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// read the deletion entry
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if lastAppendAtNs, e = verifyDeletedNeedleIntegrity(v.DataBackend, v.Version(), key); e != nil {
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return lastAppendAtNs, fmt.Errorf("verifyNeedleIntegrity %s failed: %v", indexFile.Name(), e)
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}
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} else {
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if lastAppendAtNs, e = verifyNeedleIntegrity(v.DataBackend, v.Version(), offset.ToAcutalOffset(), key, size); e != nil {
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return lastAppendAtNs, fmt.Errorf("verifyNeedleIntegrity %s failed: %v", indexFile.Name(), e)
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}
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}
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return
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}
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func verifyIndexFileIntegrity(indexFile *os.File) (indexSize int64, err error) {
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if indexSize, err = util.GetFileSize(indexFile); err == nil {
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if indexSize%NeedleMapEntrySize != 0 {
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err = fmt.Errorf("index file's size is %d bytes, maybe corrupted", indexSize)
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}
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}
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return
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}
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func readIndexEntryAtOffset(indexFile *os.File, offset int64) (bytes []byte, err error) {
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if offset < 0 {
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err = fmt.Errorf("offset %d for index file is invalid", offset)
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return
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}
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bytes = make([]byte, NeedleMapEntrySize)
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_, err = indexFile.ReadAt(bytes, offset)
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return
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}
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func verifyNeedleIntegrity(datFile backend.BackendStorageFile, v needle.Version, offset int64, key NeedleId, size Size) (lastAppendAtNs uint64, err error) {
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n := new(needle.Needle)
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if err = n.ReadData(datFile, offset, size, v); err != nil {
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return n.AppendAtNs, fmt.Errorf("read data [%d,%d) : %v", offset, offset+int64(size), err)
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}
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if n.Id != key {
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return n.AppendAtNs, fmt.Errorf("index key %#x does not match needle's Id %#x", key, n.Id)
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}
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return n.AppendAtNs, err
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}
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func verifyDeletedNeedleIntegrity(datFile backend.BackendStorageFile, v needle.Version, key NeedleId) (lastAppendAtNs uint64, err error) {
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n := new(needle.Needle)
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size := n.DiskSize(v)
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var fileSize int64
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fileSize, _, err = datFile.GetStat()
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if err != nil {
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return 0, fmt.Errorf("GetStat: %v", err)
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}
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if err = n.ReadData(datFile, fileSize-size, Size(0), v); err != nil {
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return n.AppendAtNs, fmt.Errorf("read data [%d,%d) : %v", fileSize-size, size, err)
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}
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if n.Id != key {
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return n.AppendAtNs, fmt.Errorf("index key %#x does not match needle's Id %#x", key, n.Id)
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}
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return n.AppendAtNs, err
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}
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