package pgproto3 import ( "bytes" "encoding/binary" "encoding/json" "github.com/jackc/pgx/v5/internal/pgio" ) type Execute struct { Portal string MaxRows uint32 } // Frontend identifies this message as sendable by a PostgreSQL frontend. func (*Execute) Frontend() {} // 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 *Execute) Decode(src []byte) error { buf := bytes.NewBuffer(src) b, err := buf.ReadBytes(0) if err != nil { return err } dst.Portal = string(b[:len(b)-1]) if buf.Len() < 4 { return &invalidMessageFormatErr{messageType: "Execute"} } dst.MaxRows = binary.BigEndian.Uint32(buf.Next(4)) return nil } // Encode encodes src into dst. dst will include the 1 byte message type identifier and the 4 byte message length. func (src *Execute) Encode(dst []byte) []byte { dst = append(dst, 'E') sp := len(dst) dst = pgio.AppendInt32(dst, -1) dst = append(dst, src.Portal...) dst = append(dst, 0) dst = pgio.AppendUint32(dst, src.MaxRows) pgio.SetInt32(dst[sp:], int32(len(dst[sp:]))) return dst } // MarshalJSON implements encoding/json.Marshaler. func (src Execute) MarshalJSON() ([]byte, error) { return json.Marshal(struct { Type string Portal string MaxRows uint32 }{ Type: "Execute", Portal: src.Portal, MaxRows: src.MaxRows, }) }