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