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package pgproto3
import (
"bytes"
"encoding/binary"
"encoding/json"
"github.com/jackc/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,
})
}
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