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package pgproto3
import (
"bytes"
"encoding/binary"
"encoding/json"
"errors"
"github.com/jackc/pgx/v5/internal/pgio"
)
type CopyInResponse struct {
OverallFormat byte
ColumnFormatCodes []uint16
}
// Backend identifies this message as sendable by the PostgreSQL backend.
func (*CopyInResponse) Backend() {}
// Decode decodes src into dst. src must contain the complete message with the exception of the initial 1 byte message
// type identifier and 4 byte message length.
func (dst *CopyInResponse) Decode(src []byte) error {
buf := bytes.NewBuffer(src)
if buf.Len() < 3 {
return &invalidMessageFormatErr{messageType: "CopyInResponse"}
}
overallFormat := buf.Next(1)[0]
columnCount := int(binary.BigEndian.Uint16(buf.Next(2)))
if buf.Len() != columnCount*2 {
return &invalidMessageFormatErr{messageType: "CopyInResponse"}
}
columnFormatCodes := make([]uint16, columnCount)
for i := 0; i < columnCount; i++ {
columnFormatCodes[i] = binary.BigEndian.Uint16(buf.Next(2))
}
*dst = CopyInResponse{OverallFormat: overallFormat, ColumnFormatCodes: columnFormatCodes}
return nil
}
// Encode encodes src into dst. dst will include the 1 byte message type identifier and the 4 byte message length.
func (src *CopyInResponse) Encode(dst []byte) []byte {
dst = append(dst, 'G')
sp := len(dst)
dst = pgio.AppendInt32(dst, -1)
dst = append(dst, src.OverallFormat)
dst = pgio.AppendUint16(dst, uint16(len(src.ColumnFormatCodes)))
for _, fc := range src.ColumnFormatCodes {
dst = pgio.AppendUint16(dst, fc)
}
pgio.SetInt32(dst[sp:], int32(len(dst[sp:])))
return dst
}
// MarshalJSON implements encoding/json.Marshaler.
func (src CopyInResponse) MarshalJSON() ([]byte, error) {
return json.Marshal(struct {
Type string
ColumnFormatCodes []uint16
}{
Type: "CopyInResponse",
ColumnFormatCodes: src.ColumnFormatCodes,
})
}
// UnmarshalJSON implements encoding/json.Unmarshaler.
func (dst *CopyInResponse) UnmarshalJSON(data []byte) error {
// Ignore null, like in the main JSON package.
if string(data) == "null" {
return nil
}
var msg struct {
OverallFormat string
ColumnFormatCodes []uint16
}
if err := json.Unmarshal(data, &msg); err != nil {
return err
}
if len(msg.OverallFormat) != 1 {
return errors.New("invalid length for CopyInResponse.OverallFormat")
}
dst.OverallFormat = msg.OverallFormat[0]
dst.ColumnFormatCodes = msg.ColumnFormatCodes
return nil
}
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