health.dart

// Copyright 2016 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.

import 'enum_util.dart';
import 'message.dart';

/// Requests an application health check.
class GetHealth implements Command {
  @override
  final String kind = 'get_health';

  /// Deserializes the command from JSON generated by [serialize].
  static GetHealth deserialize(Map<String, String> json) => new GetHealth();

  @override
  Map<String, String> serialize() => const <String, String>{};
}

/// Application health status.
enum HealthStatus {
  /// Application is known to be in a good shape and should be able to respond.
  ok,

  /// Application is not known to be in a good shape and may be unresponsive.
  bad,
}

final EnumIndex<HealthStatus> _healthStatusIndex =
    new EnumIndex<HealthStatus>(HealthStatus.values);

/// Application health status.
class Health extends Result {
  /// Creates a [Health] object with the given [status].
  Health(this.status) {
    assert(status != null);
  }

  /// Deserializes the result from JSON.
  static Health fromJson(Map<String, dynamic> json) {
    return new Health(_healthStatusIndex.lookupBySimpleName(json['status']));
  }

  /// Health status
  final HealthStatus status;

  @override
  Map<String, dynamic> toJson() => <String, dynamic>{
    'status': _healthStatusIndex.toSimpleName(status)
  };
}