chromecast/browser/metrics/cast_stability_metrics_provider.h

// Copyright 2014 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.

#ifndef CHROMECAST_BROWSER_METRICS_CAST_STABILITY_METRICS_PROVIDER_H_
#define CHROMECAST_BROWSER_METRICS_CAST_STABILITY_METRICS_PROVIDER_H_

#include "base/macros.h"
#include "base/process/kill.h"
#include "components/metrics/metrics_provider.h"
#include "content/public/browser/browser_child_process_observer.h"
#include "content/public/browser/notification_observer.h"
#include "content/public/browser/notification_registrar.h"

class PrefRegistrySimple;

namespace content {
class RenderProcessHost;
}

namespace metrics {
class MetricsService;
}

namespace chromecast {
namespace metrics {

// CastStabilityMetricsProvider gathers and logs stability-related metrics.
// Loosely based on ChromeStabilityMetricsProvider from chrome/browser/metrics.
class CastStabilityMetricsProvider
    : public ::metrics::MetricsProvider,
      public content::BrowserChildProcessObserver,
      public content::NotificationObserver {
 public:
  // Registers local state prefs used by this class.
  static void RegisterPrefs(PrefRegistrySimple* registry);

  explicit CastStabilityMetricsProvider(
      ::metrics::MetricsService* metrics_service);
  ~CastStabilityMetricsProvider() override;

  // metrics::MetricsDataProvider implementation:
  void OnRecordingEnabled() override;
  void OnRecordingDisabled() override;
  void ProvideStabilityMetrics(
      ::metrics::SystemProfileProto* system_profile_proto) override;

  // Logs an external crash, presumably from the ExternalMetrics service.
  void LogExternalCrash(const std::string& crash_type);

 private:
  // content::NotificationObserver implementation:
  void Observe(int type,
               const content::NotificationSource& source,
               const content::NotificationDetails& details) override;

  // content::BrowserChildProcessObserver implementation:
  void BrowserChildProcessCrashed(
      const content::ChildProcessData& data,
      const content::ChildProcessTerminationInfo& info) override;

  // Records a renderer process crash.
  void LogRendererCrash(content::RenderProcessHost* host,
                        base::TerminationStatus status,
                        int exit_code);

  // Records a renderer process hang.
  void LogRendererHang();

  // Registrar for receiving stability-related notifications.
  content::NotificationRegistrar registrar_;

  // Reference to the current MetricsService. Raw pointer is safe, since
  // MetricsService is responsible for the lifetime of
  // CastStabilityMetricsProvider.
  ::metrics::MetricsService* metrics_service_;

  DISALLOW_COPY_AND_ASSIGN(CastStabilityMetricsProvider);
};

}  // namespace metrics
}  // namespace chromecast

#endif  // CHROMECAST_BROWSER_METRICS_CAST_STABILITY_METRICS_PROVIDER_H_