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xid8.go
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xid8.go
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package postgres
import (
"database/sql/driver"
"encoding/binary"
"fmt"
"strconv"
"github.com/jackc/pgio"
"github.com/jackc/pgx/v5/pgtype"
)
// Adapted from https://github.com/jackc/pgx/blob/ca022267dbbfe7a8ba7070557352a5cd08f6cb37/pgtype/uint32.go
type Uint64Scanner interface {
ScanUint64(v xid8) error
}
type Uint64Valuer interface {
Uint64Value() (xid8, error)
}
// xid8 is the core type that is used to XID.
type xid8 struct {
Uint64 uint64
Valid bool
}
func newXid8(u uint64) xid8 {
return xid8{
Uint64: u,
Valid: true,
}
}
func (n *xid8) ScanUint64(v xid8) error {
*n = v
return nil
}
func (n xid8) Uint64Value() (xid8, error) {
return n, nil
}
type Uint64Codec struct{}
func (Uint64Codec) FormatSupported(format int16) bool {
return format == pgtype.TextFormatCode || format == pgtype.BinaryFormatCode
}
func (Uint64Codec) PreferredFormat() int16 {
return pgtype.BinaryFormatCode
}
func (Uint64Codec) PlanEncode(_ *pgtype.Map, _ uint32, format int16, value any) pgtype.EncodePlan {
switch format {
case pgtype.BinaryFormatCode:
switch value.(type) {
case uint64:
return encodePlanUint64CodecBinaryUint64{}
case Uint64Valuer:
return encodePlanUint64CodecBinaryUint64Valuer{}
}
case pgtype.TextFormatCode:
switch value.(type) {
case uint64:
return encodePlanUint64CodecTextUint64{}
}
}
return nil
}
type encodePlanUint64CodecBinaryUint64 struct{}
func (encodePlanUint64CodecBinaryUint64) Encode(value any, buf []byte) (newBuf []byte, err error) {
v := value.(uint64)
return pgio.AppendUint64(buf, v), nil
}
type encodePlanUint64CodecBinaryUint64Valuer struct{}
func (encodePlanUint64CodecBinaryUint64Valuer) Encode(value any, buf []byte) (newBuf []byte, err error) {
v, err := value.(Uint64Valuer).Uint64Value()
if err != nil {
return nil, err
}
if !v.Valid {
return nil, nil
}
return pgio.AppendUint64(buf, v.Uint64), nil
}
type encodePlanUint64CodecTextUint64 struct{}
func (encodePlanUint64CodecTextUint64) Encode(value any, buf []byte) (newBuf []byte, err error) {
v := value.(uint64)
return append(buf, strconv.FormatUint(v, 10)...), nil
}
func (Uint64Codec) PlanScan(_ *pgtype.Map, _ uint32, format int16, target any) pgtype.ScanPlan {
switch format {
case pgtype.BinaryFormatCode:
switch target.(type) {
case *uint64:
return scanPlanBinaryUint64ToUint64{}
case Uint64Scanner:
return scanPlanBinaryUint64ToUint64Scanner{}
}
case pgtype.TextFormatCode:
switch target.(type) {
case *uint64:
return scanPlanTextAnyToUint64{}
case Uint64Scanner:
return scanPlanTextAnyToUint64Scanner{}
}
}
return nil
}
func (c Uint64Codec) DecodeDatabaseSQLValue(m *pgtype.Map, oid uint32, format int16, src []byte) (driver.Value, error) {
if src == nil {
return nil, nil
}
var n uint64
err := codecScan(c, m, oid, format, src, &n)
if err != nil {
return nil, err
}
return int64(n), nil
}
func (c Uint64Codec) DecodeValue(m *pgtype.Map, oid uint32, format int16, src []byte) (any, error) {
if src == nil {
return nil, nil
}
var n uint64
err := codecScan(c, m, oid, format, src, &n)
if err != nil {
return nil, err
}
return n, nil
}
type scanPlanBinaryUint64ToUint64 struct{}
func (scanPlanBinaryUint64ToUint64) Scan(src []byte, dst any) error {
if src == nil {
return fmt.Errorf("cannot scan NULL into %T", dst)
}
if len(src) != 8 {
return fmt.Errorf("invalid length for uint64: %v", len(src))
}
p := (dst).(*uint64)
*p = binary.BigEndian.Uint64(src)
return nil
}
type scanPlanBinaryUint64ToUint64Scanner struct{}
func (scanPlanBinaryUint64ToUint64Scanner) Scan(src []byte, dst any) error {
s, ok := (dst).(Uint64Scanner)
if !ok {
return pgtype.ErrScanTargetTypeChanged
}
if src == nil {
return s.ScanUint64(xid8{})
}
if len(src) != 8 {
return fmt.Errorf("invalid length for uint64: %v", len(src))
}
n := binary.BigEndian.Uint64(src)
return s.ScanUint64(xid8{Uint64: n, Valid: true})
}
type scanPlanTextAnyToUint64Scanner struct{}
func (scanPlanTextAnyToUint64Scanner) Scan(src []byte, dst any) error {
s, ok := (dst).(Uint64Scanner)
if !ok {
return pgtype.ErrScanTargetTypeChanged
}
if src == nil {
return s.ScanUint64(xid8{})
}
n, err := strconv.ParseUint(string(src), 10, 64)
if err != nil {
return err
}
return s.ScanUint64(xid8{Uint64: n, Valid: true})
}
func codecScan(codec pgtype.Codec, m *pgtype.Map, oid uint32, format int16, src []byte, dst any) error {
scanPlan := codec.PlanScan(m, oid, format, dst)
if scanPlan == nil {
return fmt.Errorf("PlanScan did not find a plan")
}
return scanPlan.Scan(src, dst)
}
type scanPlanTextAnyToUint64 struct{}
func (scanPlanTextAnyToUint64) Scan(src []byte, dst any) error {
if src == nil {
return fmt.Errorf("cannot scan NULL into %T", dst)
}
p, ok := (dst).(*uint64)
if !ok {
return pgtype.ErrScanTargetTypeChanged
}
n, err := strconv.ParseUint(string(src), 10, 32)
if err != nil {
return err
}
*p = n
return nil
}