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|
package pgtype
import (
"database/sql/driver"
"encoding/json"
"errors"
"fmt"
)
type JSON struct {
Bytes []byte
Status Status
}
func (dst *JSON) Set(src interface{}) error {
if src == nil {
*dst = JSON{Status: 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 string:
*dst = JSON{Bytes: []byte(value), Status: Present}
case *string:
if value == nil {
*dst = JSON{Status: Null}
} else {
*dst = JSON{Bytes: []byte(*value), Status: Present}
}
case []byte:
if value == nil {
*dst = JSON{Status: Null}
} else {
*dst = JSON{Bytes: value, Status: Present}
}
// Encode* methods are defined on *JSON. If JSON is passed directly then the
// struct itself would be encoded instead of Bytes. This is clearly a footgun
// so detect and return an error. See https://github.com/jackc/pgx/issues/350.
case JSON:
return errors.New("use pointer to pgtype.JSON instead of value")
// Same as above but for JSONB (because they share implementation)
case JSONB:
return errors.New("use pointer to pgtype.JSONB instead of value")
default:
buf, err := json.Marshal(value)
if err != nil {
return err
}
*dst = JSON{Bytes: buf, Status: Present}
}
return nil
}
func (dst JSON) Get() interface{} {
switch dst.Status {
case Present:
var i interface{}
err := json.Unmarshal(dst.Bytes, &i)
if err != nil {
return dst
}
return i
case Null:
return nil
default:
return dst.Status
}
}
func (src *JSON) AssignTo(dst interface{}) error {
switch v := dst.(type) {
case *string:
if src.Status == Present {
*v = string(src.Bytes)
} else {
return fmt.Errorf("cannot assign non-present status to %T", dst)
}
case **string:
if src.Status == Present {
s := string(src.Bytes)
*v = &s
return nil
} else {
*v = nil
return nil
}
case *[]byte:
if src.Status != Present {
*v = nil
} else {
buf := make([]byte, len(src.Bytes))
copy(buf, src.Bytes)
*v = buf
}
default:
data := src.Bytes
if data == nil || src.Status != Present {
data = []byte("null")
}
return json.Unmarshal(data, dst)
}
return nil
}
func (JSON) PreferredResultFormat() int16 {
return TextFormatCode
}
func (dst *JSON) DecodeText(ci *ConnInfo, src []byte) error {
if src == nil {
*dst = JSON{Status: Null}
return nil
}
*dst = JSON{Bytes: src, Status: Present}
return nil
}
func (dst *JSON) DecodeBinary(ci *ConnInfo, src []byte) error {
return dst.DecodeText(ci, src)
}
func (JSON) PreferredParamFormat() int16 {
return TextFormatCode
}
func (src JSON) EncodeText(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
}
func (src JSON) EncodeBinary(ci *ConnInfo, buf []byte) ([]byte, error) {
return src.EncodeText(ci, buf)
}
// Scan implements the database/sql Scanner interface.
func (dst *JSON) Scan(src interface{}) error {
if src == nil {
*dst = JSON{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 fmt.Errorf("cannot scan %T", src)
}
// Value implements the database/sql/driver Valuer interface.
func (src JSON) Value() (driver.Value, error) {
switch src.Status {
case Present:
return src.Bytes, nil
case Null:
return nil, nil
default:
return nil, errUndefined
}
}
func (src JSON) MarshalJSON() ([]byte, error) {
switch src.Status {
case Present:
return src.Bytes, nil
case Null:
return []byte("null"), nil
case Undefined:
return nil, errUndefined
}
return nil, errBadStatus
}
func (dst *JSON) UnmarshalJSON(b []byte) error {
if b == nil || string(b) == "null" {
*dst = JSON{Status: Null}
} else {
*dst = JSON{Bytes: b, Status: Present}
}
return nil
}
|
