frostfs-api-go/refs/uuid.go
2020-07-03 09:17:35 +03:00

84 lines
2 KiB
Go

package refs
import (
"bytes"
"encoding/hex"
"github.com/gogo/protobuf/proto"
"github.com/google/uuid"
"github.com/pkg/errors"
)
func encodeHex(dst []byte, uuid UUID) {
hex.Encode(dst, uuid[:4])
dst[8] = '-'
hex.Encode(dst[9:13], uuid[4:6])
dst[13] = '-'
hex.Encode(dst[14:18], uuid[6:8])
dst[18] = '-'
hex.Encode(dst[19:23], uuid[8:10])
dst[23] = '-'
hex.Encode(dst[24:], uuid[10:])
}
// Size returns size in bytes of UUID (UUIDSize).
func (UUID) Size() int { return UUIDSize }
// Empty checks that current UUID is empty value.
func (u UUID) Empty() bool { return bytes.Equal(u.Bytes(), emptyUUID) }
// Reset sets current UUID to empty value.
func (u *UUID) Reset() { *u = [UUIDSize]byte{} }
// ProtoMessage method to satisfy proto.Message.
func (UUID) ProtoMessage() {}
// Marshal returns UUID bytes representation.
func (u UUID) Marshal() ([]byte, error) { return u.Bytes(), nil }
// MarshalTo returns UUID bytes representation.
func (u UUID) MarshalTo(data []byte) (int, error) { return copy(data, u[:]), nil }
// Bytes returns UUID bytes representation.
func (u UUID) Bytes() []byte {
buf := make([]byte, UUIDSize)
copy(buf, u[:])
return buf
}
// Equal checks that current UUID is equal to passed UUID.
func (u UUID) Equal(u2 UUID) bool { return bytes.Equal(u.Bytes(), u2.Bytes()) }
func (u UUID) String() string {
var buf [36]byte
encodeHex(buf[:], u)
return string(buf[:])
}
// Unmarshal tries to parse UUID bytes representation.
func (u *UUID) Unmarshal(data []byte) error {
if ln := len(data); ln != UUIDSize {
return errors.Wrapf(ErrWrongDataSize, "expect=%d, actual=%d", UUIDSize, ln)
}
copy((*u)[:], data)
return nil
}
// Parse tries to parse UUID string representation.
func (u *UUID) Parse(id string) error {
tmp, err := uuid.Parse(id)
if err != nil {
return errors.Wrapf(err, "could not parse `%s`", id)
}
copy((*u)[:], tmp[:])
return nil
}
// Merge used by proto.Clone
func (u *UUID) Merge(src proto.Message) {
if tmp, ok := src.(*UUID); ok {
*u = *tmp
}
}