seaweedfs/weed/storage/volume_checking.go
2019-09-12 14:18:21 +01:00

67 lines
2 KiB
Go

package storage
import (
"fmt"
"os"
"github.com/chrislusf/seaweedfs/weed/storage/idx"
"github.com/chrislusf/seaweedfs/weed/storage/needle"
. "github.com/chrislusf/seaweedfs/weed/storage/types"
"github.com/chrislusf/seaweedfs/weed/util"
)
func CheckVolumeDataIntegrity(v *Volume, indexFile *os.File) (lastAppendAtNs uint64, e error) {
var indexSize int64
if indexSize, e = verifyIndexFileIntegrity(indexFile); e != nil {
return 0, fmt.Errorf("verifyIndexFileIntegrity %s failed: %v", indexFile.Name(), e)
}
if indexSize == 0 {
return 0, nil
}
var lastIdxEntry []byte
if lastIdxEntry, e = readIndexEntryAtOffset(indexFile, indexSize-NeedleMapEntrySize); e != nil {
return 0, fmt.Errorf("readLastIndexEntry %s failed: %v", indexFile.Name(), e)
}
key, offset, size := idx.IdxFileEntry(lastIdxEntry)
if offset.IsZero() {
return 0, nil
}
if size == TombstoneFileSize {
size = 0
}
if lastAppendAtNs, e = verifyNeedleIntegrity(v.dataFile, v.Version(), offset.ToAcutalOffset(), key, size); e != nil {
return lastAppendAtNs, fmt.Errorf("verifyNeedleIntegrity %s failed: %v", indexFile.Name(), e)
}
return
}
func verifyIndexFileIntegrity(indexFile *os.File) (indexSize int64, err error) {
if indexSize, err = util.GetFileSize(indexFile); err == nil {
if indexSize%NeedleMapEntrySize != 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, NeedleMapEntrySize)
_, err = indexFile.ReadAt(bytes, offset)
return
}
func verifyNeedleIntegrity(datFile *os.File, v needle.Version, offset int64, key NeedleId, size uint32) (lastAppendAtNs uint64, err error) {
n := new(needle.Needle)
if err = n.ReadData(datFile, offset, size, v); err != nil {
return n.AppendAtNs, err
}
if n.Id != key {
return n.AppendAtNs, fmt.Errorf("index key %#x does not match needle's Id %#x", key, n.Id)
}
return n.AppendAtNs, err
}