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, }) }