// 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.

#include "components/metrics/stability_metrics_helper.h"

#include <stdint.h>

#include <vector>

#include "base/logging.h"
#include "base/metrics/histogram.h"
#include "base/metrics/sparse_histogram.h"
#include "build/build_config.h"
#include "components/metrics/metrics_pref_names.h"
#include "components/metrics/proto/system_profile.pb.h"
#include "components/prefs/pref_registry_simple.h"
#include "components/prefs/pref_service.h"

#if defined(OS_WIN)
#include <windows.h>  // Needed for STATUS_* codes
#endif

#if defined(OS_CHROMEOS)
#include "components/metrics/system_memory_stats_recorder.h"
#endif

namespace metrics {

namespace {

enum RendererType {
  RENDERER_TYPE_RENDERER = 1,
  RENDERER_TYPE_EXTENSION,
  // NOTE: Add new action types only immediately above this line. Also,
  // make sure the enum list in tools/metrics/histograms/histograms.xml is
  // updated with any change in here.
  RENDERER_TYPE_COUNT
};

// Converts an exit code into something that can be inserted into our
// histograms (which expect non-negative numbers less than MAX_INT).
int MapCrashExitCodeForHistogram(int exit_code) {
#if defined(OS_WIN)
  // Since |abs(STATUS_GUARD_PAGE_VIOLATION) == MAX_INT| it causes problems in
  // histograms.cc. Solve this by remapping it to a smaller value, which
  // hopefully doesn't conflict with other codes.
  if (static_cast<DWORD>(exit_code) == STATUS_GUARD_PAGE_VIOLATION)
    return 0x1FCF7EC3;  // Randomly picked number.
#endif

  return std::abs(exit_code);
}

void RecordChildKills(int histogram_type) {
  UMA_HISTOGRAM_ENUMERATION("BrowserRenderProcessHost.ChildKills",
                            histogram_type, RENDERER_TYPE_COUNT);
}

}  // namespace

StabilityMetricsHelper::StabilityMetricsHelper(PrefService* local_state)
    : local_state_(local_state) {
  DCHECK(local_state_);
}

StabilityMetricsHelper::~StabilityMetricsHelper() {}

void StabilityMetricsHelper::ProvideStabilityMetrics(
    SystemProfileProto* system_profile_proto) {
  SystemProfileProto_Stability* stability_proto =
      system_profile_proto->mutable_stability();

  int count = local_state_->GetInteger(prefs::kStabilityPageLoadCount);
  if (count) {
    stability_proto->set_page_load_count(count);
    local_state_->SetInteger(prefs::kStabilityPageLoadCount, 0);
  }

  count = local_state_->GetInteger(prefs::kStabilityChildProcessCrashCount);
  if (count) {
    stability_proto->set_child_process_crash_count(count);
    local_state_->SetInteger(prefs::kStabilityChildProcessCrashCount, 0);
  }

  count = local_state_->GetInteger(prefs::kStabilityRendererCrashCount);
  if (count) {
    stability_proto->set_renderer_crash_count(count);
    local_state_->SetInteger(prefs::kStabilityRendererCrashCount, 0);
  }

  count = local_state_->GetInteger(prefs::kStabilityRendererFailedLaunchCount);
  if (count) {
    stability_proto->set_renderer_failed_launch_count(count);
    local_state_->SetInteger(prefs::kStabilityRendererFailedLaunchCount, 0);
  }

  count =
      local_state_->GetInteger(prefs::kStabilityExtensionRendererCrashCount);
  if (count) {
    stability_proto->set_extension_renderer_crash_count(count);
    local_state_->SetInteger(prefs::kStabilityExtensionRendererCrashCount, 0);
  }

  count = local_state_->GetInteger(
      prefs::kStabilityExtensionRendererFailedLaunchCount);
  if (count) {
    stability_proto->set_extension_renderer_failed_launch_count(count);
    local_state_->SetInteger(
        prefs::kStabilityExtensionRendererFailedLaunchCount, 0);
  }

  count = local_state_->GetInteger(prefs::kStabilityRendererHangCount);
  if (count) {
    stability_proto->set_renderer_hang_count(count);
    local_state_->SetInteger(prefs::kStabilityRendererHangCount, 0);
  }
}

void StabilityMetricsHelper::ClearSavedStabilityMetrics() {
  // Clear all the prefs used in this class in UMA reports (which doesn't
  // include |kUninstallMetricsPageLoadCount| as it's not sent up by UMA).
  local_state_->SetInteger(prefs::kStabilityChildProcessCrashCount, 0);
  local_state_->SetInteger(prefs::kStabilityExtensionRendererCrashCount, 0);
  local_state_->SetInteger(prefs::kStabilityExtensionRendererFailedLaunchCount,
                           0);
  local_state_->SetInteger(prefs::kStabilityPageLoadCount, 0);
  local_state_->SetInteger(prefs::kStabilityRendererCrashCount, 0);
  local_state_->SetInteger(prefs::kStabilityRendererFailedLaunchCount, 0);
  local_state_->SetInteger(prefs::kStabilityRendererHangCount, 0);
}

// static
void StabilityMetricsHelper::RegisterPrefs(PrefRegistrySimple* registry) {
  registry->RegisterIntegerPref(prefs::kStabilityChildProcessCrashCount, 0);
  registry->RegisterIntegerPref(prefs::kStabilityExtensionRendererCrashCount,
                                0);
  registry->RegisterIntegerPref(
      prefs::kStabilityExtensionRendererFailedLaunchCount, 0);
  registry->RegisterIntegerPref(prefs::kStabilityPageLoadCount, 0);
  registry->RegisterIntegerPref(prefs::kStabilityRendererCrashCount, 0);
  registry->RegisterIntegerPref(prefs::kStabilityRendererFailedLaunchCount, 0);
  registry->RegisterIntegerPref(prefs::kStabilityRendererHangCount, 0);

  registry->RegisterInt64Pref(prefs::kUninstallMetricsPageLoadCount, 0);
}

void StabilityMetricsHelper::BrowserChildProcessCrashed() {
  IncrementPrefValue(prefs::kStabilityChildProcessCrashCount);
}

void StabilityMetricsHelper::LogLoadStarted() {
  base::RecordAction(base::UserMetricsAction("PageLoad"));
  // TODO(asvitkine): Check if this is used for anything and if not, remove.
  LOCAL_HISTOGRAM_BOOLEAN("Chrome.UmaPageloadCounter", true);
  IncrementPrefValue(prefs::kStabilityPageLoadCount);
  IncrementLongPrefsValue(prefs::kUninstallMetricsPageLoadCount);
  // We need to save the prefs, as page load count is a critical stat, and it
  // might be lost due to a crash :-(.
}

void StabilityMetricsHelper::LogRendererCrash(bool was_extension_process,
                                              base::TerminationStatus status,
                                              int exit_code) {
  int histogram_type =
      was_extension_process ? RENDERER_TYPE_EXTENSION : RENDERER_TYPE_RENDERER;
  if (status == base::TERMINATION_STATUS_PROCESS_CRASHED ||
      status == base::TERMINATION_STATUS_ABNORMAL_TERMINATION) {
    if (was_extension_process) {
      IncrementPrefValue(prefs::kStabilityExtensionRendererCrashCount);

      UMA_HISTOGRAM_SPARSE_SLOWLY("CrashExitCodes.Extension",
                                  MapCrashExitCodeForHistogram(exit_code));
    } else {
      IncrementPrefValue(prefs::kStabilityRendererCrashCount);

      UMA_HISTOGRAM_SPARSE_SLOWLY("CrashExitCodes.Renderer",
                                  MapCrashExitCodeForHistogram(exit_code));
    }

    UMA_HISTOGRAM_ENUMERATION("BrowserRenderProcessHost.ChildCrashes",
                              histogram_type, RENDERER_TYPE_COUNT);
  } else if (status == base::TERMINATION_STATUS_PROCESS_WAS_KILLED) {
    RecordChildKills(histogram_type);
#if defined(OS_CHROMEOS)
  } else if (status == base::TERMINATION_STATUS_PROCESS_WAS_KILLED_BY_OOM) {
    RecordChildKills(histogram_type);
    UMA_HISTOGRAM_ENUMERATION("BrowserRenderProcessHost.ChildKills.OOM",
                              was_extension_process ? 2 : 1, 3);
    RecordMemoryStats(was_extension_process
                          ? RECORD_MEMORY_STATS_EXTENSIONS_OOM_KILLED
                          : RECORD_MEMORY_STATS_CONTENTS_OOM_KILLED);
#endif
  } else if (status == base::TERMINATION_STATUS_STILL_RUNNING) {
    UMA_HISTOGRAM_ENUMERATION("BrowserRenderProcessHost.DisconnectedAlive",
                              histogram_type, RENDERER_TYPE_COUNT);
  } else if (status == base::TERMINATION_STATUS_LAUNCH_FAILED) {
    UMA_HISTOGRAM_ENUMERATION("BrowserRenderProcessHost.ChildLaunchFailures",
                              histogram_type, RENDERER_TYPE_COUNT);
    if (was_extension_process)
      IncrementPrefValue(prefs::kStabilityExtensionRendererFailedLaunchCount);
    else
      IncrementPrefValue(prefs::kStabilityRendererFailedLaunchCount);
  }
}

void StabilityMetricsHelper::IncrementPrefValue(const char* path) {
  int value = local_state_->GetInteger(path);
  local_state_->SetInteger(path, value + 1);
}

void StabilityMetricsHelper::IncrementLongPrefsValue(const char* path) {
  int64_t value = local_state_->GetInt64(path);
  local_state_->SetInt64(path, value + 1);
}

void StabilityMetricsHelper::LogRendererHang() {
  IncrementPrefValue(prefs::kStabilityRendererHangCount);
}

}  // namespace metrics