// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

syntax = "proto2";

option optimize_for = LITE_RUNTIME;

package blimp;

// Indicates the message-Id that the peer has most-recently processed.
message CheckpointAckMessage {
  optional int64 checkpoint_id = 1;
}

// Contains Client->Engine information to establish an authenticated connection.
message StartConnectionMessage {
  optional string client_auth_token = 1;
  optional int32 protocol_version = 2;
}

// Indicates the reason for the peer ending the connection.
message EndConnectionMessage {
  enum Reason {
    UNKNOWN = 0;
    AUTHENTICATION_FAILED = 1;
    PROTOCOL_MISMATCH = 2;
  };
  optional Reason reason = 1;
}

message ProtocolControlMessage {
  oneof connection_message {
    // Client => Server types.
    StartConnectionMessage start_connection = 41;

    // Bi-directional types.
    CheckpointAckMessage checkpoint_ack = 42;
    EndConnectionMessage end_connection = 43;
  }
}