package pgproto3 import ( "bytes" "encoding/binary" "encoding/json" "errors" "github.com/jackc/pgio" ) type CopyOutResponse struct { OverallFormat byte ColumnFormatCodes []uint16 } func (*CopyOutResponse) 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 *CopyOutResponse) Decode(src []byte) error { buf := bytes.NewBuffer(src) if buf.Len() < 3 { return &invalidMessageFormatErr{messageType: "CopyOutResponse"} } overallFormat := buf.Next(1)[0] columnCount := int(binary.BigEndian.Uint16(buf.Next(2))) if buf.Len() != columnCount*2 { return &invalidMessageFormatErr{messageType: "CopyOutResponse"} } columnFormatCodes := make([]uint16, columnCount) for i := 0; i < columnCount; i++ { columnFormatCodes[i] = binary.BigEndian.Uint16(buf.Next(2)) } *dst = CopyOutResponse{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 *CopyOutResponse) Encode(dst []byte) []byte { dst = append(dst, 'H') 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 CopyOutResponse) MarshalJSON() ([]byte, error) { return json.Marshal(struct { Type string ColumnFormatCodes []uint16 }{ Type: "CopyOutResponse", ColumnFormatCodes: src.ColumnFormatCodes, }) } // UnmarshalJSON implements encoding/json.Unmarshaler. func (dst *CopyOutResponse) 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 CopyOutResponse.OverallFormat") } dst.OverallFormat = msg.OverallFormat[0] dst.ColumnFormatCodes = msg.ColumnFormatCodes return nil }