Extract guts of ChromeStabilityMetricsProvider into helper class

chrome/browser/metrics/chrome_stability_metrics_provider.cc

 // 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.
 
 #include "chrome/browser/metrics/chrome_stability_metrics_provider.h"
 
 #include <vector>
 
 #include "base/logging.h"
 #include "base/metrics/histogram.h"
 #include "base/metrics/sparse_histogram.h"
-#include "base/prefs/pref_registry_simple.h"
-#include "base/prefs/pref_service.h"
 #include "chrome/browser/chrome_notification_types.h"
 #include "chrome/common/chrome_constants.h"
-#include "chrome/common/pref_names.h"
-#include "components/metrics/proto/system_profile.pb.h"
 #include "content/public/browser/child_process_data.h"
 #include "content/public/browser/notification_service.h"
 #include "content/public/browser/render_process_host.h"
-#include "content/public/browser/user_metrics.h"
-#include "content/public/browser/web_contents.h"
 
 #if defined(ENABLE_EXTENSIONS)
 #include "extensions/browser/process_map.h"
 #endif
 
 #if defined(ENABLE_PLUGINS)
 #include "chrome/browser/metrics/plugin_metrics_provider.h"
 #endif
 
 #if defined(OS_WIN)
 #include <windows.h>  // Needed for STATUS_* codes
 #include "chrome/installer/util/install_util.h"
 #include "components/browser_watcher/crash_reporting_metrics_win.h"
 #endif
 
-#if defined(OS_CHROMEOS)
-#include "chrome/browser/memory/system_memory_stats_recorder.h"
-#endif
-
 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 (exit_code == STATUS_GUARD_PAGE_VIOLATION)
-    return 0x1FCF7EC3;  // Randomly picked number.
-#endif
-
-  return std::abs(exit_code);
-}
-
 #if defined(OS_WIN)
 void CountBrowserCrashDumpAttempts() {
   enum Outcome {
     OUTCOME_SUCCESS,
     OUTCOME_FAILURE,
     OUTCOME_UNKNOWN,
     OUTCOME_MAX_VALUE
   };
 
   browser_watcher::CrashReportingMetrics::Values metrics =
@@ skipping 23 matching lines @@
       outcome = OUTCOME_FAILURE;
     }
 
     UMA_STABILITY_HISTOGRAM_ENUMERATION(
         "CrashReport.BreakpadDumpWithoutCrashOutcome", outcome,
         OUTCOME_MAX_VALUE);
   }
 }
 #endif  // defined(OS_WIN)
 
-void RecordChildKills(int histogram_type) {
-  UMA_HISTOGRAM_ENUMERATION("BrowserRenderProcessHost.ChildKills",
-                            histogram_type, RENDERER_TYPE_COUNT);
-}
-
 }  // namespace
 
 ChromeStabilityMetricsProvider::ChromeStabilityMetricsProvider(
     PrefService* local_state)
-    : local_state_(local_state) {
-  DCHECK(local_state_);
+    : helper_(local_state) {
   BrowserChildProcessObserver::Add(this);
 }
 
 ChromeStabilityMetricsProvider::~ChromeStabilityMetricsProvider() {
   BrowserChildProcessObserver::Remove(this);
 }
 
 void ChromeStabilityMetricsProvider::OnRecordingEnabled() {
   registrar_.Add(this,
                  content::NOTIFICATION_LOAD_START,
                  content::NotificationService::AllSources());
   registrar_.Add(this,
                  content::NOTIFICATION_RENDERER_PROCESS_CLOSED,
                  content::NotificationService::AllSources());
   registrar_.Add(this,
                  content::NOTIFICATION_RENDER_WIDGET_HOST_HANG,
                  content::NotificationService::AllSources());
 }
 
 void ChromeStabilityMetricsProvider::OnRecordingDisabled() {
   registrar_.RemoveAll();
 }
 
 void ChromeStabilityMetricsProvider::ProvideStabilityMetrics(
     metrics::SystemProfileProto* system_profile_proto) {
-  metrics::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);
-  }
+  helper_.ProvideStabilityMetrics(system_profile_proto);
 
 #if defined(OS_WIN)
   CountBrowserCrashDumpAttempts();
 #endif  // defined(OS_WIN)
 }
 
 void ChromeStabilityMetricsProvider::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 ChromeStabilityMetricsProvider::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);
+  helper_.ClearSavedStabilityMetrics();
 }
 
 void ChromeStabilityMetricsProvider::Observe(
     int type,
     const content::NotificationSource& source,
     const content::NotificationDetails& details) {
   switch (type) {
     case content::NOTIFICATION_LOAD_START: {
-      content::NavigationController* controller =
-          content::Source<content::NavigationController>(source).ptr();
-      content::WebContents* web_contents = controller->GetWebContents();
-      LogLoadStarted(web_contents);
+      helper_.LogLoadStarted();
       break;
     }
 
     case content::NOTIFICATION_RENDERER_PROCESS_CLOSED: {
       content::RenderProcessHost::RendererClosedDetails* process_details =
           content::Details<content::RenderProcessHost::RendererClosedDetails>(
               details).ptr();
+      bool was_extension_process = false;
+#if defined(ENABLE_EXTENSIONS)
       content::RenderProcessHost* host =
           content::Source<content::RenderProcessHost>(source).ptr();
-      LogRendererCrash(
-          host, process_details->status, process_details->exit_code);
+      if (extensions::ProcessMap::Get(host->GetBrowserContext())
+              ->Contains(host->GetID()))

[Alexei Svitkine (slow), 2015/09/24 15:42:38]

Nit: {}'s

[blundell, 2015/09/24 16:15:31]

Done.

+        was_extension_process = true;
+#endif
+      helper_.LogRendererCrash(was_extension_process, process_details->status,
+                               process_details->exit_code);
       break;
     }
 
     case content::NOTIFICATION_RENDER_WIDGET_HOST_HANG:
-      LogRendererHang();
+      helper_.LogRendererHang();
       break;
 
     default:
       NOTREACHED();
       break;
   }
 }
 
 void ChromeStabilityMetricsProvider::BrowserChildProcessCrashed(
     const content::ChildProcessData& data,
     int exit_code) {
 #if defined(ENABLE_PLUGINS)
   // Exclude plugin crashes from the count below because we report them via
   // a separate UMA metric.
   if (PluginMetricsProvider::IsPluginProcess(data.process_type))
     return;
 #endif
 
-  IncrementPrefValue(prefs::kStabilityChildProcessCrashCount);
+  helper_.BrowserChildProcessCrashed();
 }
-
-void ChromeStabilityMetricsProvider::LogLoadStarted(
-    content::WebContents* web_contents) {
-  content::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 ChromeStabilityMetricsProvider::LogRendererCrash(
-    content::RenderProcessHost* host,
-    base::TerminationStatus status,
-    int exit_code) {
-  int histogram_type = RENDERER_TYPE_RENDERER;
-  bool was_extension_process = false;
-#if defined(ENABLE_EXTENSIONS)
-  if (extensions::ProcessMap::Get(host->GetBrowserContext())
-          ->Contains(host->GetID())) {
-    histogram_type = RENDERER_TYPE_EXTENSION;
-    was_extension_process = true;
-  }
-#endif
-  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);
-    memory::RecordMemoryStats(
-        was_extension_process
-            ? memory::RECORD_MEMORY_STATS_EXTENSIONS_OOM_KILLED
-            : memory::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 ChromeStabilityMetricsProvider::IncrementPrefValue(const char* path) {
-  int value = local_state_->GetInteger(path);
-  local_state_->SetInteger(path, value + 1);
-}
-
-void ChromeStabilityMetricsProvider::IncrementLongPrefsValue(const char* path) {
-  int64 value = local_state_->GetInt64(path);
-  local_state_->SetInt64(path, value + 1);
-}
-
-void ChromeStabilityMetricsProvider::LogRendererHang() {
-  IncrementPrefValue(prefs::kStabilityRendererHangCount);
-}