forked from jackc/pgx
/
uuid.go
186 lines (159 loc) · 3.7 KB
/
uuid.go
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package pgtype
import (
"database/sql/driver"
"encoding/hex"
"fmt"
"github.com/pkg/errors"
)
type UUID struct {
Bytes [16]byte
Status Status
}
func (dst *UUID) Set(src interface{}) error {
if src == nil {
*dst = UUID{Status: Null}
return nil
}
switch value := src.(type) {
case [16]byte:
*dst = UUID{Bytes: value, Status: Present}
case []byte:
if value != nil {
if len(value) != 16 {
return errors.Errorf("[]byte must be 16 bytes to convert to UUID: %d", len(value))
}
*dst = UUID{Status: Present}
copy(dst.Bytes[:], value)
} else {
*dst = UUID{Status: Null}
}
case string:
uuid, err := parseUUID(value)
if err != nil {
return err
}
*dst = UUID{Bytes: uuid, Status: Present}
default:
if originalSrc, ok := underlyingPtrType(src); ok {
return dst.Set(originalSrc)
}
return errors.Errorf("cannot convert %v to UUID", value)
}
return nil
}
func (dst *UUID) Get() interface{} {
switch dst.Status {
case Present:
return dst.Bytes
case Null:
return nil
default:
return dst.Status
}
}
func (src *UUID) AssignTo(dst interface{}) error {
switch src.Status {
case Present:
switch v := dst.(type) {
case *[16]byte:
*v = src.Bytes
return nil
case *[]byte:
*v = make([]byte, 16)
copy(*v, src.Bytes[:])
return nil
case *string:
*v = encodeUUID(src.Bytes)
return nil
default:
if nextDst, retry := GetAssignToDstType(v); retry {
return src.AssignTo(nextDst)
}
}
case Null:
return NullAssignTo(dst)
}
return errors.Errorf("cannot assign %v into %T", src, dst)
}
// parseUUID converts a string UUID in standard form to a byte array.
func parseUUID(src string) (dst [16]byte, err error) {
if len(src) < 36 {
return dst, errors.Errorf("cannot parse UUID %v", src)
}
src = src[0:8] + src[9:13] + src[14:18] + src[19:23] + src[24:]
buf, err := hex.DecodeString(src)
if err != nil {
return dst, err
}
copy(dst[:], buf)
return dst, err
}
// encodeUUID converts a uuid byte array to UUID standard string form.
func encodeUUID(src [16]byte) string {
return fmt.Sprintf("%x-%x-%x-%x-%x", src[0:4], src[4:6], src[6:8], src[8:10], src[10:16])
}
func (dst *UUID) DecodeText(ci *ConnInfo, src []byte) error {
if src == nil {
*dst = UUID{Status: Null}
return nil
}
if len(src) != 36 {
return errors.Errorf("invalid length for UUID: %v", len(src))
}
buf, err := parseUUID(string(src))
if err != nil {
return err
}
*dst = UUID{Bytes: buf, Status: Present}
return nil
}
func (dst *UUID) DecodeBinary(ci *ConnInfo, src []byte) error {
if src == nil {
*dst = UUID{Status: Null}
return nil
}
if len(src) != 16 {
return errors.Errorf("invalid length for UUID: %v", len(src))
}
*dst = UUID{Status: Present}
copy(dst.Bytes[:], src)
return nil
}
func (src *UUID) EncodeText(ci *ConnInfo, buf []byte) ([]byte, error) {
switch src.Status {
case Null:
return nil, nil
case Undefined:
return nil, errUndefined
}
return append(buf, encodeUUID(src.Bytes)...), nil
}
func (src *UUID) EncodeBinary(ci *ConnInfo, buf []byte) ([]byte, error) {
switch src.Status {
case Null:
return nil, nil
case Undefined:
return nil, errUndefined
}
return append(buf, src.Bytes[:]...), nil
}
// Scan implements the database/sql Scanner interface.
func (dst *UUID) Scan(src interface{}) error {
if src == nil {
*dst = UUID{Status: Null}
return nil
}
switch src := src.(type) {
case string:
return dst.DecodeText(nil, []byte(src))
case []byte:
srcCopy := make([]byte, len(src))
copy(srcCopy, src)
return dst.DecodeText(nil, srcCopy)
}
return errors.Errorf("cannot scan %T", src)
}
// Value implements the database/sql/driver Valuer interface.
func (src *UUID) Value() (driver.Value, error) {
return EncodeValueText(src)
}