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|
package numeric
import (
"database/sql/driver"
"errors"
"fmt"
"strconv"
"github.com/jackc/pgtype"
"github.com/shopspring/decimal"
)
var errUndefined = errors.New("cannot encode status undefined")
var errBadStatus = errors.New("invalid status")
type Numeric struct {
Decimal decimal.Decimal
Status pgtype.Status
}
func (dst *Numeric) Set(src interface{}) error {
if src == nil {
*dst = Numeric{Status: pgtype.Null}
return nil
}
if value, ok := src.(interface{ Get() interface{} }); ok {
value2 := value.Get()
if value2 != value {
return dst.Set(value2)
}
}
switch value := src.(type) {
case decimal.Decimal:
*dst = Numeric{Decimal: value, Status: pgtype.Present}
case decimal.NullDecimal:
if value.Valid {
*dst = Numeric{Decimal: value.Decimal, Status: pgtype.Present}
} else {
*dst = Numeric{Status: pgtype.Null}
}
case float32:
*dst = Numeric{Decimal: decimal.NewFromFloat(float64(value)), Status: pgtype.Present}
case float64:
*dst = Numeric{Decimal: decimal.NewFromFloat(value), Status: pgtype.Present}
case int8:
*dst = Numeric{Decimal: decimal.New(int64(value), 0), Status: pgtype.Present}
case uint8:
*dst = Numeric{Decimal: decimal.New(int64(value), 0), Status: pgtype.Present}
case int16:
*dst = Numeric{Decimal: decimal.New(int64(value), 0), Status: pgtype.Present}
case uint16:
*dst = Numeric{Decimal: decimal.New(int64(value), 0), Status: pgtype.Present}
case int32:
*dst = Numeric{Decimal: decimal.New(int64(value), 0), Status: pgtype.Present}
case uint32:
*dst = Numeric{Decimal: decimal.New(int64(value), 0), Status: pgtype.Present}
case int64:
*dst = Numeric{Decimal: decimal.New(int64(value), 0), Status: pgtype.Present}
case uint64:
// uint64 could be greater than int64 so convert to string then to decimal
dec, err := decimal.NewFromString(strconv.FormatUint(value, 10))
if err != nil {
return err
}
*dst = Numeric{Decimal: dec, Status: pgtype.Present}
case int:
*dst = Numeric{Decimal: decimal.New(int64(value), 0), Status: pgtype.Present}
case uint:
// uint could be greater than int64 so convert to string then to decimal
dec, err := decimal.NewFromString(strconv.FormatUint(uint64(value), 10))
if err != nil {
return err
}
*dst = Numeric{Decimal: dec, Status: pgtype.Present}
case string:
dec, err := decimal.NewFromString(value)
if err != nil {
return err
}
*dst = Numeric{Decimal: dec, Status: pgtype.Present}
default:
// If all else fails see if pgtype.Numeric can handle it. If so, translate through that.
num := &pgtype.Numeric{}
if err := num.Set(value); err != nil {
return fmt.Errorf("cannot convert %v to Numeric", value)
}
buf, err := num.EncodeText(nil, nil)
if err != nil {
return fmt.Errorf("cannot convert %v to Numeric", value)
}
dec, err := decimal.NewFromString(string(buf))
if err != nil {
return fmt.Errorf("cannot convert %v to Numeric", value)
}
*dst = Numeric{Decimal: dec, Status: pgtype.Present}
}
return nil
}
func (dst Numeric) Get() interface{} {
switch dst.Status {
case pgtype.Present:
return dst.Decimal
case pgtype.Null:
return nil
default:
return dst.Status
}
}
func (src *Numeric) AssignTo(dst interface{}) error {
switch src.Status {
case pgtype.Present:
switch v := dst.(type) {
case *decimal.Decimal:
*v = src.Decimal
case *decimal.NullDecimal:
(*v).Valid = true
(*v).Decimal = src.Decimal
case *float32:
f, _ := src.Decimal.Float64()
*v = float32(f)
case *float64:
f, _ := src.Decimal.Float64()
*v = f
case *int:
if src.Decimal.Exponent() < 0 {
return fmt.Errorf("cannot convert %v to %T", dst, *v)
}
n, err := strconv.ParseInt(src.Decimal.String(), 10, strconv.IntSize)
if err != nil {
return fmt.Errorf("cannot convert %v to %T", dst, *v)
}
*v = int(n)
case *int8:
if src.Decimal.Exponent() < 0 {
return fmt.Errorf("cannot convert %v to %T", dst, *v)
}
n, err := strconv.ParseInt(src.Decimal.String(), 10, 8)
if err != nil {
return fmt.Errorf("cannot convert %v to %T", dst, *v)
}
*v = int8(n)
case *int16:
if src.Decimal.Exponent() < 0 {
return fmt.Errorf("cannot convert %v to %T", dst, *v)
}
n, err := strconv.ParseInt(src.Decimal.String(), 10, 16)
if err != nil {
return fmt.Errorf("cannot convert %v to %T", dst, *v)
}
*v = int16(n)
case *int32:
if src.Decimal.Exponent() < 0 {
return fmt.Errorf("cannot convert %v to %T", dst, *v)
}
n, err := strconv.ParseInt(src.Decimal.String(), 10, 32)
if err != nil {
return fmt.Errorf("cannot convert %v to %T", dst, *v)
}
*v = int32(n)
case *int64:
if src.Decimal.Exponent() < 0 {
return fmt.Errorf("cannot convert %v to %T", dst, *v)
}
n, err := strconv.ParseInt(src.Decimal.String(), 10, 64)
if err != nil {
return fmt.Errorf("cannot convert %v to %T", dst, *v)
}
*v = int64(n)
case *uint:
if src.Decimal.Exponent() < 0 || src.Decimal.Sign() < 0 {
return fmt.Errorf("cannot convert %v to %T", dst, *v)
}
n, err := strconv.ParseUint(src.Decimal.String(), 10, strconv.IntSize)
if err != nil {
return fmt.Errorf("cannot convert %v to %T", dst, *v)
}
*v = uint(n)
case *uint8:
if src.Decimal.Exponent() < 0 || src.Decimal.Sign() < 0 {
return fmt.Errorf("cannot convert %v to %T", dst, *v)
}
n, err := strconv.ParseUint(src.Decimal.String(), 10, 8)
if err != nil {
return fmt.Errorf("cannot convert %v to %T", dst, *v)
}
*v = uint8(n)
case *uint16:
if src.Decimal.Exponent() < 0 || src.Decimal.Sign() < 0 {
return fmt.Errorf("cannot convert %v to %T", dst, *v)
}
n, err := strconv.ParseUint(src.Decimal.String(), 10, 16)
if err != nil {
return fmt.Errorf("cannot convert %v to %T", dst, *v)
}
*v = uint16(n)
case *uint32:
if src.Decimal.Exponent() < 0 || src.Decimal.Sign() < 0 {
return fmt.Errorf("cannot convert %v to %T", dst, *v)
}
n, err := strconv.ParseUint(src.Decimal.String(), 10, 32)
if err != nil {
return fmt.Errorf("cannot convert %v to %T", dst, *v)
}
*v = uint32(n)
case *uint64:
if src.Decimal.Exponent() < 0 || src.Decimal.Sign() < 0 {
return fmt.Errorf("cannot convert %v to %T", dst, *v)
}
n, err := strconv.ParseUint(src.Decimal.String(), 10, 64)
if err != nil {
return fmt.Errorf("cannot convert %v to %T", dst, *v)
}
*v = uint64(n)
default:
if nextDst, retry := pgtype.GetAssignToDstType(dst); retry {
return src.AssignTo(nextDst)
}
return fmt.Errorf("unable to assign to %T", dst)
}
case pgtype.Null:
if v, ok := dst.(*decimal.NullDecimal); ok {
(*v).Valid = false
} else {
return pgtype.NullAssignTo(dst)
}
}
return nil
}
func (dst *Numeric) DecodeText(ci *pgtype.ConnInfo, src []byte) error {
if src == nil {
*dst = Numeric{Status: pgtype.Null}
return nil
}
dec, err := decimal.NewFromString(string(src))
if err != nil {
return err
}
*dst = Numeric{Decimal: dec, Status: pgtype.Present}
return nil
}
func (dst *Numeric) DecodeBinary(ci *pgtype.ConnInfo, src []byte) error {
if src == nil {
*dst = Numeric{Status: pgtype.Null}
return nil
}
// For now at least, implement this in terms of pgtype.Numeric
num := &pgtype.Numeric{}
if err := num.DecodeBinary(ci, src); err != nil {
return err
}
*dst = Numeric{Decimal: decimal.NewFromBigInt(num.Int, num.Exp), Status: pgtype.Present}
return nil
}
func (src Numeric) EncodeText(ci *pgtype.ConnInfo, buf []byte) ([]byte, error) {
switch src.Status {
case pgtype.Null:
return nil, nil
case pgtype.Undefined:
return nil, errUndefined
}
return append(buf, src.Decimal.String()...), nil
}
func (src Numeric) EncodeBinary(ci *pgtype.ConnInfo, buf []byte) ([]byte, error) {
switch src.Status {
case pgtype.Null:
return nil, nil
case pgtype.Undefined:
return nil, errUndefined
}
// For now at least, implement this in terms of pgtype.Numeric
num := &pgtype.Numeric{}
if err := num.DecodeText(ci, []byte(src.Decimal.String())); err != nil {
return nil, err
}
return num.EncodeBinary(ci, buf)
}
// Scan implements the database/sql Scanner interface.
func (dst *Numeric) Scan(src interface{}) error {
if src == nil {
*dst = Numeric{Status: pgtype.Null}
return nil
}
switch src := src.(type) {
case float64:
*dst = Numeric{Decimal: decimal.NewFromFloat(src), Status: pgtype.Present}
return nil
case string:
return dst.DecodeText(nil, []byte(src))
case []byte:
return dst.DecodeText(nil, src)
}
return fmt.Errorf("cannot scan %T", src)
}
// Value implements the database/sql/driver Valuer interface.
func (src Numeric) Value() (driver.Value, error) {
switch src.Status {
case pgtype.Present:
return src.Decimal.Value()
case pgtype.Null:
return nil, nil
default:
return nil, errUndefined
}
}
func (src Numeric) MarshalJSON() ([]byte, error) {
switch src.Status {
case pgtype.Present:
return src.Decimal.MarshalJSON()
case pgtype.Null:
return []byte("null"), nil
case pgtype.Undefined:
return nil, errUndefined
}
return nil, errBadStatus
}
func (dst *Numeric) UnmarshalJSON(b []byte) error {
d := decimal.NullDecimal{}
err := d.UnmarshalJSON(b)
if err != nil {
return err
}
status := pgtype.Null
if d.Valid {
status = pgtype.Present
}
*dst = Numeric{Decimal: d.Decimal, Status: status}
return nil
}
|
