components/html_viewer/stats_collection_controller.cc

   1 // Copyright 2015 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "components/html_viewer/stats_collection_controller.h"
   6
   7 #include "base/command_line.h"
   8 #include "base/memory/scoped_ptr.h"
   9 #include "base/metrics/histogram.h"
  10 #include "base/metrics/statistics_recorder.h"
  11 #include "base/time/time.h"
  12 #include "components/startup_metric_utils/startup_metric_utils.h"
  13 #include "gin/handle.h"
  14 #include "gin/object_template_builder.h"
  15 #include "mojo/application/public/cpp/application_impl.h"
  16 #include "mojo/services/tracing/public/cpp/switches.h"
  17 #include "third_party/WebKit/public/web/WebKit.h"
  18 #include "third_party/WebKit/public/web/WebLocalFrame.h"
  19
  20 namespace html_viewer {
  21
  22 namespace {
  23
  24 // Initialize the histogram data using the given startup performance times.
  25 // TODO(msw): Use TimeTicks to avoid system clock changes: crbug.com/521164
  26 void GetStartupPerformanceTimesCallbackImpl(
  27     tracing::StartupPerformanceTimesPtr times) {
  28   base::StatisticsRecorder::Initialize();
  29
  30   startup_metric_utils::RecordStartupProcessCreationTime(
  31       base::Time::FromInternalValue(times->shell_process_creation_time));
  32
  33   // TODO(msw): Record the MojoMain() entry point time of mojo:browser instead?
  34   startup_metric_utils::RecordMainEntryPointTime(
  35       base::Time::FromInternalValue(times->shell_main_entry_point_time));
  36
  37   // TODO(msw): Determine if this is the first run.
  38   startup_metric_utils::RecordBrowserMainMessageLoopStart(
  39       base::Time::FromInternalValue(times->browser_message_loop_start_time),
  40       false);
  41
  42   startup_metric_utils::RecordBrowserWindowDisplay(
  43       base::Time::FromInternalValue(times->browser_window_display_time));
  44
  45   // TODO(msw): Consolidate with chrome's PreMainMessageLoopRunImpl()...
  46   // TODO(msw): Need to measure the "browser_open_start" time for this delta...
  47   const base::Time browser_open_start =
  48       base::Time::FromInternalValue(times->shell_process_creation_time);
  49   const base::Time browser_open_tabs_time =
  50       base::Time::FromInternalValue(times->browser_open_tabs_time);
  51   base::TimeDelta delta = browser_open_tabs_time - browser_open_start;
  52   UMA_HISTOGRAM_LONG_TIMES_100("Startup.BrowserOpenTabs", delta);
  53
  54   startup_metric_utils::RecordFirstWebContentsMainFrameLoad(
  55       base::Time::FromInternalValue(
  56           times->first_web_contents_main_frame_load_time));
  57
  58   startup_metric_utils::RecordFirstWebContentsNonEmptyPaint(
  59       base::Time::FromInternalValue(
  60           times->first_visually_non_empty_layout_time));
  61 }
  62
  63 }  // namespace
  64
  65 // static
  66 gin::WrapperInfo StatsCollectionController::kWrapperInfo = {
  67     gin::kEmbedderNativeGin};
  68
  69 // static
  70 tracing::StartupPerformanceDataCollectorPtr StatsCollectionController::Install(
  71     blink::WebFrame* frame,
  72     mojo::ApplicationImpl* app) {
  73   // Only make startup tracing available when running in the context of a test.
  74   if (!app ||
  75       !base::CommandLine::ForCurrentProcess()->HasSwitch(
  76           tracing::kEnableStatsCollectionBindings)) {
  77     return nullptr;
  78   }
  79
  80   v8::Isolate* isolate = blink::mainThreadIsolate();
  81   v8::HandleScope handle_scope(isolate);
  82   v8::Local<v8::Context> context = frame->mainWorldScriptContext();
  83   if (context.IsEmpty())
  84     return nullptr;
  85
  86   v8::Context::Scope context_scope(context);
  87
  88   mojo::URLRequestPtr request(mojo::URLRequest::New());
  89   request->url = mojo::String::From("mojo:tracing");
  90   scoped_ptr<mojo::ApplicationConnection> connection =
  91       app->ConnectToApplication(request.Pass());
  92   if (!connection)
  93     return nullptr;
  94   tracing::StartupPerformanceDataCollectorPtr collector_for_controller;
  95   tracing::StartupPerformanceDataCollectorPtr collector_for_caller;
  96   connection->ConnectToService(&collector_for_controller);
  97   connection->ConnectToService(&collector_for_caller);
  98
  99   gin::Handle<StatsCollectionController> controller = gin::CreateHandle(
 100       isolate, new StatsCollectionController(collector_for_controller.Pass()));
 101   DCHECK(!controller.IsEmpty());
 102   v8::Local<v8::Object> global = context->Global();
 103   global->Set(gin::StringToV8(isolate, "statsCollectionController"),
 104               controller.ToV8());
 105   return collector_for_caller.Pass();
 106 }
 107
 108 StatsCollectionController::StatsCollectionController(
 109     tracing::StartupPerformanceDataCollectorPtr collector)
 110     : startup_performance_data_collector_(collector.Pass()) {}
 111
 112 StatsCollectionController::~StatsCollectionController() {}
 113
 114 gin::ObjectTemplateBuilder StatsCollectionController::GetObjectTemplateBuilder(
 115     v8::Isolate* isolate) {
 116   return gin::Wrappable<StatsCollectionController>::GetObjectTemplateBuilder(
 117              isolate)
 118       .SetMethod("getHistogram", &StatsCollectionController::GetHistogram)
 119       .SetMethod("getBrowserHistogram",
 120                  &StatsCollectionController::GetBrowserHistogram);
 121 }
 122
 123 std::string StatsCollectionController::GetHistogram(
 124     const std::string& histogram_name) {
 125   DCHECK(base::CommandLine::ForCurrentProcess()->HasSwitch(
 126       tracing::kEnableStatsCollectionBindings));
 127
 128   static bool startup_histogram_initialized = false;
 129   if (!startup_histogram_initialized) {
 130     // Get the startup performance times from the tracing service.
 131     auto callback = base::Bind(&GetStartupPerformanceTimesCallbackImpl);
 132     startup_performance_data_collector_->GetStartupPerformanceTimes(callback);
 133     startup_performance_data_collector_.WaitForIncomingResponse();
 134     DCHECK(base::StatisticsRecorder::IsActive());
 135     startup_histogram_initialized = true;
 136   }
 137
 138   std::string histogram_json = "{}";
 139   base::HistogramBase* histogram =
 140       base::StatisticsRecorder::FindHistogram(histogram_name);
 141   if (histogram)
 142     histogram->WriteJSON(&histogram_json);
 143   return histogram_json;
 144 }
 145
 146 std::string StatsCollectionController::GetBrowserHistogram(
 147     const std::string& histogram_name) {
 148   return GetHistogram(histogram_name);
 149 }
 150
 151 }  // namespace html_viewer