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package pgproto3
import (
"encoding/binary"
"encoding/json"
"errors"
"github.com/jackc/pgx/v5/internal/pgio"
)
const cancelRequestCode = 80877102
type CancelRequest struct {
ProcessID uint32
SecretKey uint32
}
// Frontend identifies this message as sendable by a PostgreSQL frontend.
func (*CancelRequest) Frontend() {}
func (dst *CancelRequest) Decode(src []byte) error {
if len(src) != 12 {
return errors.New("bad cancel request size")
}
requestCode := binary.BigEndian.Uint32(src)
if requestCode != cancelRequestCode {
return errors.New("bad cancel request code")
}
dst.ProcessID = binary.BigEndian.Uint32(src[4:])
dst.SecretKey = binary.BigEndian.Uint32(src[8:])
return nil
}
// Encode encodes src into dst. dst will include the 4 byte message length.
func (src *CancelRequest) Encode(dst []byte) ([]byte, error) {
dst = pgio.AppendInt32(dst, 16)
dst = pgio.AppendInt32(dst, cancelRequestCode)
dst = pgio.AppendUint32(dst, src.ProcessID)
dst = pgio.AppendUint32(dst, src.SecretKey)
return dst, nil
}
// MarshalJSON implements encoding/json.Marshaler.
func (src CancelRequest) MarshalJSON() ([]byte, error) {
return json.Marshal(struct {
Type string
ProcessID uint32
SecretKey uint32
}{
Type: "CancelRequest",
ProcessID: src.ProcessID,
SecretKey: src.SecretKey,
})
}
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