add function ParseFileIdFromString

weed/storage/needle/file_id.go

@@ -2,6 +2,8 @@ package needle
 
 import (
 	"encoding/hex"
+	"fmt"
+	"strings"
 
 	. "github.com/chrislusf/seaweedfs/weed/storage/types"
 )
@@ -20,6 +22,41 @@ 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)
 }
@@ -33,3 +70,12 @@ func formatNeedleIdCookie(key NeedleId, cookie Cookie) string {
 	}
 	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
+}