mirror of
https://github.com/seaweedfs/seaweedfs.git
synced 2024-11-27 04:39:25 +08:00
102 lines
2.4 KiB
Go
102 lines
2.4 KiB
Go
package meta_cache
|
|
|
|
import (
|
|
"fmt"
|
|
"strconv"
|
|
"strings"
|
|
)
|
|
|
|
type UidGidMapper struct {
|
|
uidMapper *IdMapper
|
|
gidMapper *IdMapper
|
|
}
|
|
|
|
type IdMapper struct {
|
|
localToFiler map[uint32]uint32
|
|
filerToLocal map[uint32]uint32
|
|
}
|
|
|
|
// UidGidMapper translates local uid/gid to filer uid/gid
|
|
// The local storage always persists the same as the filer.
|
|
// The local->filer translation happens when updating the filer first and later saving to meta_cache.
|
|
// And filer->local happens when reading from the meta_cache.
|
|
func NewUidGidMapper(uidPairsStr, gidPairStr string) (*UidGidMapper, error) {
|
|
uidMapper, err := newIdMapper(uidPairsStr)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
gidMapper, err := newIdMapper(gidPairStr)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
return &UidGidMapper{
|
|
uidMapper: uidMapper,
|
|
gidMapper: gidMapper,
|
|
}, nil
|
|
}
|
|
|
|
func (m *UidGidMapper) LocalToFiler(uid, gid uint32) (uint32, uint32) {
|
|
return m.uidMapper.LocalToFiler(uid), m.gidMapper.LocalToFiler(gid)
|
|
}
|
|
func (m *UidGidMapper) FilerToLocal(uid, gid uint32) (uint32, uint32) {
|
|
return m.uidMapper.FilerToLocal(uid), m.gidMapper.FilerToLocal(gid)
|
|
}
|
|
|
|
func (m *IdMapper) LocalToFiler(id uint32) uint32 {
|
|
value, found := m.localToFiler[id]
|
|
if found {
|
|
return value
|
|
}
|
|
return id
|
|
}
|
|
func (m *IdMapper) FilerToLocal(id uint32) uint32 {
|
|
value, found := m.filerToLocal[id]
|
|
if found {
|
|
return value
|
|
}
|
|
return id
|
|
}
|
|
|
|
func newIdMapper(pairsStr string) (*IdMapper, error) {
|
|
|
|
localToFiler, filerToLocal, err := parseUint32Pairs(pairsStr)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
return &IdMapper{
|
|
localToFiler: localToFiler,
|
|
filerToLocal: filerToLocal,
|
|
}, nil
|
|
|
|
}
|
|
|
|
func parseUint32Pairs(pairsStr string) (localToFiler, filerToLocal map[uint32]uint32, err error) {
|
|
|
|
if pairsStr == "" {
|
|
return
|
|
}
|
|
|
|
localToFiler = make(map[uint32]uint32)
|
|
filerToLocal = make(map[uint32]uint32)
|
|
for _, pairStr := range strings.Split(pairsStr, ",") {
|
|
pair := strings.Split(pairStr, ":")
|
|
localUidStr, filerUidStr := pair[0], pair[1]
|
|
localUid, localUidErr := strconv.Atoi(localUidStr)
|
|
if localUidErr != nil {
|
|
err = fmt.Errorf("failed to parse local %s: %v", localUidStr, localUidErr)
|
|
return
|
|
}
|
|
filerUid, filerUidErr := strconv.Atoi(filerUidStr)
|
|
if filerUidErr != nil {
|
|
err = fmt.Errorf("failed to parse remote %s: %v", filerUidStr, filerUidErr)
|
|
return
|
|
}
|
|
localToFiler[uint32(localUid)] = uint32(filerUid)
|
|
filerToLocal[uint32(filerUid)] = uint32(localUid)
|
|
}
|
|
|
|
return
|
|
}
|