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json.go
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json.go
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package pgtype
import (
"database/sql"
"database/sql/driver"
"encoding/json"
"fmt"
"reflect"
)
type JSONCodec struct{}
func (JSONCodec) FormatSupported(format int16) bool {
return format == TextFormatCode || format == BinaryFormatCode
}
func (JSONCodec) PreferredFormat() int16 {
return TextFormatCode
}
func (c JSONCodec) PlanEncode(m *Map, oid uint32, format int16, value any) EncodePlan {
switch value.(type) {
case string:
return encodePlanJSONCodecEitherFormatString{}
case []byte:
return encodePlanJSONCodecEitherFormatByteSlice{}
// Must come before trying wrap encode plans because a pointer to a struct may be unwrapped to a struct that can be
// marshalled.
//
// https://github.com/jackc/pgx/issues/1681
case json.Marshaler:
return encodePlanJSONCodecEitherFormatMarshal{}
// Cannot rely on driver.Valuer being handled later because anything can be marshalled.
//
// https://github.com/jackc/pgx/issues/1430
case driver.Valuer:
return &encodePlanDriverValuer{m: m, oid: oid, formatCode: format}
}
// Because anything can be marshalled the normal wrapping in Map.PlanScan doesn't get a chance to run. So try the
// appropriate wrappers here.
for _, f := range []TryWrapEncodePlanFunc{
TryWrapDerefPointerEncodePlan,
TryWrapFindUnderlyingTypeEncodePlan,
} {
if wrapperPlan, nextValue, ok := f(value); ok {
if nextPlan := c.PlanEncode(m, oid, format, nextValue); nextPlan != nil {
wrapperPlan.SetNext(nextPlan)
return wrapperPlan
}
}
}
return encodePlanJSONCodecEitherFormatMarshal{}
}
type encodePlanJSONCodecEitherFormatString struct{}
func (encodePlanJSONCodecEitherFormatString) Encode(value any, buf []byte) (newBuf []byte, err error) {
jsonString := value.(string)
buf = append(buf, jsonString...)
return buf, nil
}
type encodePlanJSONCodecEitherFormatByteSlice struct{}
func (encodePlanJSONCodecEitherFormatByteSlice) Encode(value any, buf []byte) (newBuf []byte, err error) {
jsonBytes := value.([]byte)
if jsonBytes == nil {
return nil, nil
}
buf = append(buf, jsonBytes...)
return buf, nil
}
type encodePlanJSONCodecEitherFormatMarshal struct{}
func (encodePlanJSONCodecEitherFormatMarshal) Encode(value any, buf []byte) (newBuf []byte, err error) {
jsonBytes, err := json.Marshal(value)
if err != nil {
return nil, err
}
buf = append(buf, jsonBytes...)
return buf, nil
}
func (JSONCodec) PlanScan(m *Map, oid uint32, format int16, target any) ScanPlan {
switch target.(type) {
case *string:
return scanPlanAnyToString{}
case **string:
// This is to fix **string scanning. It seems wrong to special case **string, but it's not clear what a better
// solution would be.
//
// https://github.com/jackc/pgx/issues/1470 -- **string
// https://github.com/jackc/pgx/issues/1691 -- ** anything else
if wrapperPlan, nextDst, ok := TryPointerPointerScanPlan(target); ok {
if nextPlan := m.planScan(oid, format, nextDst); nextPlan != nil {
if _, failed := nextPlan.(*scanPlanFail); !failed {
wrapperPlan.SetNext(nextPlan)
return wrapperPlan
}
}
}
case *[]byte:
return scanPlanJSONToByteSlice{}
case BytesScanner:
return scanPlanBinaryBytesToBytesScanner{}
// Cannot rely on sql.Scanner being handled later because scanPlanJSONToJSONUnmarshal will take precedence.
//
// https://github.com/jackc/pgx/issues/1418
case sql.Scanner:
return &scanPlanSQLScanner{formatCode: format}
}
return scanPlanJSONToJSONUnmarshal{}
}
type scanPlanAnyToString struct{}
func (scanPlanAnyToString) Scan(src []byte, dst any) error {
p := dst.(*string)
*p = string(src)
return nil
}
type scanPlanJSONToByteSlice struct{}
func (scanPlanJSONToByteSlice) Scan(src []byte, dst any) error {
dstBuf := dst.(*[]byte)
if src == nil {
*dstBuf = nil
return nil
}
*dstBuf = make([]byte, len(src))
copy(*dstBuf, src)
return nil
}
type scanPlanJSONToBytesScanner struct{}
func (scanPlanJSONToBytesScanner) Scan(src []byte, dst any) error {
scanner := (dst).(BytesScanner)
return scanner.ScanBytes(src)
}
type scanPlanJSONToJSONUnmarshal struct{}
func (scanPlanJSONToJSONUnmarshal) Scan(src []byte, dst any) error {
if src == nil {
dstValue := reflect.ValueOf(dst)
if dstValue.Kind() == reflect.Ptr {
el := dstValue.Elem()
switch el.Kind() {
case reflect.Ptr, reflect.Slice, reflect.Map, reflect.Interface:
el.Set(reflect.Zero(el.Type()))
return nil
}
}
return fmt.Errorf("cannot scan NULL into %T", dst)
}
elem := reflect.ValueOf(dst).Elem()
elem.Set(reflect.Zero(elem.Type()))
return json.Unmarshal(src, dst)
}
func (c JSONCodec) DecodeDatabaseSQLValue(m *Map, oid uint32, format int16, src []byte) (driver.Value, error) {
if src == nil {
return nil, nil
}
dstBuf := make([]byte, len(src))
copy(dstBuf, src)
return dstBuf, nil
}
func (c JSONCodec) DecodeValue(m *Map, oid uint32, format int16, src []byte) (any, error) {
if src == nil {
return nil, nil
}
var dst any
err := json.Unmarshal(src, &dst)
return dst, err
}