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package needle
import (
"encoding/hex"
"fmt"
"strings"
. "github.com/seaweedfs/seaweedfs/weed/storage/types"
)
type FileId struct {
VolumeId VolumeId
Key NeedleId
Cookie Cookie
}
func NewFileIdFromNeedle(VolumeId VolumeId, n *Needle) *FileId {
return &FileId{VolumeId: VolumeId, Key: n.Id, Cookie: n.Cookie}
}
func NewFileId(VolumeId VolumeId, key uint64, cookie uint32) *FileId {
return &FileId{VolumeId: VolumeId, Key: Uint64ToNeedleId(key), Cookie: Uint32ToCookie(cookie)}
}
// Deserialize the file id
func ParseFileIdFromString(fid string) (*FileId, error) {
vid, needleKeyCookie, err := splitVolumeId(fid)
if err != nil {
return nil, err
}
volumeId, err := NewVolumeId(vid)
if err != nil {
return nil, err
}
nid, cookie, err := ParseNeedleIdCookie(needleKeyCookie)
if err != nil {
return nil, err
}
fileId := &FileId{VolumeId: volumeId, Key: nid, Cookie: cookie}
return fileId, nil
}
func (n *FileId) GetVolumeId() VolumeId {
return n.VolumeId
}
func (n *FileId) GetNeedleId() NeedleId {
return n.Key
}
func (n *FileId) GetCookie() Cookie {
return n.Cookie
}
func (n *FileId) GetNeedleIdCookie() string {
return formatNeedleIdCookie(n.Key, n.Cookie)
}
func (n *FileId) String() string {
return n.VolumeId.String() + "," + formatNeedleIdCookie(n.Key, n.Cookie)
}
func formatNeedleIdCookie(key NeedleId, cookie Cookie) string {
bytes := make([]byte, NeedleIdSize+CookieSize)
NeedleIdToBytes(bytes[0:NeedleIdSize], key)
CookieToBytes(bytes[NeedleIdSize:NeedleIdSize+CookieSize], cookie)
nonzero_index := 0
for ; bytes[nonzero_index] == 0 && nonzero_index < NeedleIdSize; nonzero_index++ {
}
return hex.EncodeToString(bytes[nonzero_index:])
}
// copied from operation/delete_content.go, to cut off cycle dependency
func splitVolumeId(fid string) (vid string, key_cookie string, err error) {
commaIndex := strings.Index(fid, ",")
if commaIndex <= 0 {
return "", "", fmt.Errorf("wrong fid format")
}
return fid[:commaIndex], fid[commaIndex+1:], nil
}
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