/*
 * Copyright (c) 2015, 2016 Oracle and/or its affiliates. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; version 2 of the
 * License.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301  USA
 */

// tell protobuf 3.0 to use protobuf 2.x rules
syntax = "proto2";

// ifdef PROTOBUF_LITE: option optimize_for = LITE_RUNTIME;

// Notices
//
// A notice
//
// * is sent from the server to the client
// * may be global or relate to the current message sequence
package Polarx.Notice;
option java_package = "com.mysql.cj.polarx.protobuf";

import "polarx_datatypes.proto";

// Common Frame for all Notices
//
// ===================================================== =====
// .type                                                 value
// ===================================================== =====
// :protobuf:msg:`Polarx.Notice::Warning`                1
// :protobuf:msg:`Polarx.Notice::SessionVariableChanged` 2
// :protobuf:msg:`Polarx.Notice::SessionStateChanged`    3
// ===================================================== =====
//
// :param type: the type of the payload
// :param payload: the payload of the notification
// :param scope: global or local notification
//
message Frame {
  enum Scope {
    GLOBAL = 1;
    LOCAL = 2;
  };
  enum Type {
    WARNING = 1;
    SESSION_VARIABLE_CHANGED = 2;
    SESSION_STATE_CHANGED = 3;
    GROUP_REPLICATION_STATE_CHANGED = 4;
    SERVER_HELLO = 5;
  };
  required uint32 type = 1;
  optional Scope  scope = 2 [ default = GLOBAL ];
  optional bytes payload = 3;
}

// Server-side warnings and notes
//
// ``.scope`` == ``local``
//   ``.level``, ``.code`` and ``.msg`` map the content of
//
//   .. code-block:: sql
//
//     SHOW WARNINGS
//
// ``.scope`` == ``global``
//   (undefined) will be used for global, unstructured messages like:
//
//   * server is shutting down
//   * a node disconnected from group
//   * schema or table dropped
//
// ========================================== =======================
// :protobuf:msg:`Polarx.Notice::Frame` field value
// ========================================== =======================
// ``.type``                                  1
// ``.scope``                                 ``local`` or ``global``
// ========================================== =======================
//
// :param level: warning level: Note or Warning
// :param code: warning code
// :param msg: warning message
message Warning {
  enum Level {
    NOTE = 1;
    WARNING = 2;
    ERROR = 3;
  };
  optional Level  level = 1 [ default = WARNING ];
  required uint32 code = 2;
  required string msg = 3;
}

// Notify clients about changes to the current session variables
//
// Every change to a variable that is accessable through:
//
// .. code-block:: sql
//
//   SHOW SESSION VARIABLES
//
// ========================================== =========
// :protobuf:msg:`Polarx.Notice::Frame` field value
// ========================================== =========
// ``.type``                                  2
// ``.scope``                                 ``local``
// ========================================== =========
//
// :param namespace: namespace that param belongs to
// :param param: name of the variable
// :param value: the changed value of param
message SessionVariableChanged {
  required string param = 1;
  optional Polarx.Datatypes.Scalar value = 2;
}


// Notify clients about changes to the internal session state
//
// ========================================== =========
// :protobuf:msg:`Polarx.Notice::Frame` field value
// ========================================== =========
// ``.type``                                  3
// ``.scope``                                 ``local``
// ========================================== =========
//
// :param param: parameter key
// :param value: updated value
message SessionStateChanged {
  enum Parameter {
     CURRENT_SCHEMA = 1;
     ACCOUNT_EXPIRED = 2;
     GENERATED_INSERT_ID = 3;
     ROWS_AFFECTED = 4;
     ROWS_FOUND = 5;
     ROWS_MATCHED = 6;
     TRX_COMMITTED = 7;
     TRX_ROLLEDBACK = 9;
     PRODUCED_MESSAGE = 10;
     CLIENT_ID_ASSIGNED = 11;
     // .. more to be added
  }
  required Parameter param = 1;
  optional Polarx.Datatypes.Scalar value = 2;
}