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      1 // Copyright 2013 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 "content/renderer/stats_collection_controller.h"
      6 
      7 #include "base/json/json_writer.h"
      8 #include "base/metrics/histogram.h"
      9 #include "base/metrics/statistics_recorder.h"
     10 #include "base/strings/string_util.h"
     11 #include "content/common/child_process_messages.h"
     12 #include "content/renderer/render_view_impl.h"
     13 #include "gin/handle.h"
     14 #include "gin/object_template_builder.h"
     15 #include "third_party/WebKit/public/web/WebKit.h"
     16 #include "third_party/WebKit/public/web/WebLocalFrame.h"
     17 #include "third_party/WebKit/public/web/WebView.h"
     18 
     19 namespace content {
     20 
     21 namespace {
     22 
     23 bool CurrentRenderViewImpl(RenderViewImpl** out) {
     24   blink::WebLocalFrame* web_frame =
     25       blink::WebLocalFrame::frameForCurrentContext();
     26   if (!web_frame)
     27     return false;
     28 
     29   blink::WebView* web_view = web_frame->view();
     30   if (!web_view)
     31     return false;
     32 
     33   RenderViewImpl* render_view_impl =
     34       RenderViewImpl::FromWebView(web_view);
     35   if (!render_view_impl)
     36     return false;
     37 
     38   *out = render_view_impl;
     39   return true;
     40 }
     41 
     42 // Encodes a WebContentsLoadTime as JSON.
     43 // Input:
     44 // - |load_start_time| - time at which page load started.
     45 // - |load_stop_time| - time at which page load stopped.
     46 // - |result| - returned JSON.
     47 // Example return value:
     48 // {'load_start_ms': 1, 'load_duration_ms': 2.5}
     49 // either value may be null if a web contents hasn't fully loaded.
     50 // load_start_ms is represented as milliseconds since the unix epoch.
     51 void ConvertLoadTimeToJSON(
     52     const base::Time& load_start_time,
     53     const base::Time& load_stop_time,
     54     std::string *result) {
     55   base::DictionaryValue item;
     56 
     57   if (load_start_time.is_null()) {
     58     item.Set("load_start_ms", base::Value::CreateNullValue());
     59   } else {
     60     item.SetDouble("load_start_ms", (load_start_time - base::Time::UnixEpoch())
     61                    .InMillisecondsF());
     62   }
     63   if (load_start_time.is_null() || load_stop_time.is_null()) {
     64     item.Set("load_duration_ms", base::Value::CreateNullValue());
     65   } else {
     66     item.SetDouble("load_duration_ms",
     67         (load_stop_time - load_start_time).InMillisecondsF());
     68   }
     69   base::JSONWriter::Write(&item, result);
     70 }
     71 
     72 }  // namespace
     73 
     74 // static
     75 gin::WrapperInfo StatsCollectionController::kWrapperInfo = {
     76     gin::kEmbedderNativeGin
     77 };
     78 
     79 // static
     80 void StatsCollectionController::Install(blink::WebFrame* frame) {
     81   v8::Isolate* isolate = blink::mainThreadIsolate();
     82   v8::HandleScope handle_scope(isolate);
     83   v8::Handle<v8::Context> context = frame->mainWorldScriptContext();
     84   if (context.IsEmpty())
     85     return;
     86 
     87   v8::Context::Scope context_scope(context);
     88 
     89   gin::Handle<StatsCollectionController> controller =
     90       gin::CreateHandle(isolate, new StatsCollectionController());
     91   if (controller.IsEmpty())
     92     return;
     93   v8::Handle<v8::Object> global = context->Global();
     94   global->Set(gin::StringToV8(isolate, "statsCollectionController"),
     95               controller.ToV8());
     96 }
     97 
     98 StatsCollectionController::StatsCollectionController() {}
     99 
    100 StatsCollectionController::~StatsCollectionController() {}
    101 
    102 gin::ObjectTemplateBuilder StatsCollectionController::GetObjectTemplateBuilder(
    103     v8::Isolate* isolate) {
    104   return gin::Wrappable<StatsCollectionController>::GetObjectTemplateBuilder(
    105       isolate)
    106       .SetMethod("getHistogram", &StatsCollectionController::GetHistogram)
    107       .SetMethod("getBrowserHistogram",
    108                  &StatsCollectionController::GetBrowserHistogram)
    109       .SetMethod("tabLoadTiming", &StatsCollectionController::GetTabLoadTiming);
    110 }
    111 
    112 std::string StatsCollectionController::GetHistogram(
    113     const std::string& histogram_name) {
    114   base::HistogramBase* histogram =
    115       base::StatisticsRecorder::FindHistogram(histogram_name);
    116   std::string output;
    117   if (!histogram) {
    118     output = "{}";
    119   } else {
    120     histogram->WriteJSON(&output);
    121   }
    122   return output;
    123 }
    124 
    125 std::string StatsCollectionController::GetBrowserHistogram(
    126     const std::string& histogram_name) {
    127   RenderViewImpl *render_view_impl = NULL;
    128   if (!CurrentRenderViewImpl(&render_view_impl)) {
    129     NOTREACHED();
    130     return std::string();
    131   }
    132 
    133   std::string histogram_json;
    134   render_view_impl->Send(new ChildProcessHostMsg_GetBrowserHistogram(
    135       histogram_name, &histogram_json));
    136   return histogram_json;
    137 }
    138 
    139 std::string StatsCollectionController::GetTabLoadTiming() {
    140   RenderViewImpl *render_view_impl = NULL;
    141   if (!CurrentRenderViewImpl(&render_view_impl)) {
    142     NOTREACHED();
    143     return std::string();
    144   }
    145 
    146   StatsCollectionObserver* observer =
    147       render_view_impl->GetStatsCollectionObserver();
    148   if (!observer) {
    149     NOTREACHED();
    150     return std::string();
    151   }
    152 
    153   std::string tab_timing_json;
    154   ConvertLoadTimeToJSON(
    155       observer->load_start_time(), observer->load_stop_time(),
    156       &tab_timing_json);
    157   return tab_timing_json;
    158 }
    159 
    160 }  // namespace content
    161