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package storage
import (
"fmt"
"os"
"github.com/chrislusf/seaweedfs/weed/util"
)
func CheckVolumeDataIntegrity(v *Volume, indexFile *os.File) error {
var indexSize int64
var e error
if indexSize, e = verifyIndexFileIntegrity(indexFile); e != nil {
return fmt.Errorf("verifyIndexFileIntegrity %s failed: %v", indexFile.Name(), e)
}
if indexSize == 0 {
return nil
}
var lastIdxEntry []byte
if lastIdxEntry, e = readIndexEntryAtOffset(indexFile, indexSize-NeedleIndexSize); e != nil {
return fmt.Errorf("readLastIndexEntry %s failed: %v", indexFile.Name(), e)
}
key, offset, size := idxFileEntry(lastIdxEntry)
//deleted index entry could not point to deleted needle
if offset == 0 {
return nil
}
if e = verifyNeedleIntegrity(v.dataFile, v.Version(), int64(offset)*NeedlePaddingSize, key, size); e != nil {
return fmt.Errorf("verifyNeedleIntegrity %s failed: %v", indexFile.Name(), e)
}
return nil
}
func verifyIndexFileIntegrity(indexFile *os.File) (indexSize int64, err error) {
if indexSize, err = util.GetFileSize(indexFile); err == nil {
if indexSize%NeedleIndexSize != 0 {
err = fmt.Errorf("index file's size is %d bytes, maybe corrupted", indexSize)
}
}
return
}
func readIndexEntryAtOffset(indexFile *os.File, offset int64) (bytes []byte, err error) {
if offset < 0 {
err = fmt.Errorf("offset %d for index file is invalid", offset)
return
}
bytes = make([]byte, NeedleIndexSize)
_, err = indexFile.ReadAt(bytes, offset)
return
}
func verifyNeedleIntegrity(datFile *os.File, v Version, offset int64, key uint64, size uint32) error {
n := new(Needle)
err := n.ReadData(datFile, offset, size, v)
if err != nil {
return err
}
if n.Id != key {
return fmt.Errorf("index key %#x does not match needle's Id %#x", key, n.Id)
}
return nil
}
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