chrome/browser/ui/webui/profiler_ui.cc

   1 // Copyright (c) 2012 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 "chrome/browser/ui/webui/profiler_ui.h"
   6
   7 #include <string>
   8
   9 // When testing the javacript code, it is cumbersome to have to keep
  10 // re-building the resouces package and reloading the browser. To solve
  11 // this, enable the following flag to read the webapp's source files
  12 // directly off disk, so all you have to do is refresh the page to
  13 // test the modifications.
  14 // #define USE_SOURCE_FILES_DIRECTLY
  15
  16 #include "base/bind.h"
  17 #include "base/memory/scoped_ptr.h"
  18 #include "base/strings/string_util.h"
  19 #include "base/tracked_objects.h"
  20 #include "base/values.h"
  21 #include "chrome/browser/profiles/profile.h"
  22 #include "chrome/browser/task_profiler/task_profiler_data_serializer.h"
  23 #include "chrome/common/url_constants.h"
  24 #include "components/metrics/profiler/tracking_synchronizer.h"
  25 #include "content/public/browser/browser_thread.h"
  26 #include "content/public/browser/url_data_source.h"
  27 #include "content/public/browser/web_contents.h"
  28 #include "content/public/browser/web_ui.h"
  29 #include "content/public/browser/web_ui_data_source.h"
  30 #include "content/public/browser/web_ui_message_handler.h"
  31 #include "grit/browser_resources.h"
  32
  33 #ifdef USE_SOURCE_FILES_DIRECTLY
  34 #include "base/base_paths.h"
  35 #include "base/files/file_util.h"
  36 #include "base/memory/ref_counted_memory.h"
  37 #include "base/path_service.h"
  38 #endif  //  USE_SOURCE_FILES_DIRECTLY
  39
  40 using content::BrowserThread;
  41 using content::WebContents;
  42 using content::WebUIMessageHandler;
  43 using metrics::TrackingSynchronizer;
  44
  45 namespace {
  46
  47 #ifdef USE_SOURCE_FILES_DIRECTLY
  48
  49 class ProfilerWebUIDataSource : public content::URLDataSource {
  50  public:
  51   ProfilerWebUIDataSource() {
  52   }
  53
  54  protected:
  55   // content::URLDataSource implementation.
  56   std::string GetSource() override {
  57     return chrome::kChromeUIProfilerHost;
  58   }
  59
  60   std::string GetMimeType(const std::string& path) const override {
  61     if (base::EndsWith(path, ".js", base::CompareCase::INSENSITIVE_ASCII))
  62       return "application/javascript";
  63     return "text/html";
  64   }
  65
  66   void StartDataRequest(
  67       const std::string& path,
  68       bool is_incognito,
  69       const content::URLDataSource::GotDataCallback& callback) override {
  70     base::FilePath base_path;
  71     PathService::Get(base::DIR_SOURCE_ROOT, &base_path);
  72     base_path = base_path.AppendASCII("chrome");
  73     base_path = base_path.AppendASCII("browser");
  74     base_path = base_path.AppendASCII("resources");
  75     base_path = base_path.AppendASCII("profiler");
  76
  77     // If no resource was specified, default to profiler.html.
  78     std::string filename = path.empty() ? "profiler.html" : path;
  79
  80     base::FilePath file_path;
  81     file_path = base_path.AppendASCII(filename);
  82
  83     // Read the file synchronously and send it as the response.
  84     base::ThreadRestrictions::ScopedAllowIO allow;
  85     std::string file_contents;
  86     if (!base::ReadFileToString(file_path, &file_contents))
  87       LOG(ERROR) << "Couldn't read file: " << file_path.value();
  88     scoped_refptr<base::RefCountedString> response =
  89         new base::RefCountedString();
  90     response->data() = file_contents;
  91     callback.Run(response);
  92   }
  93
  94  private:
  95   DISALLOW_COPY_AND_ASSIGN(ProfilerWebUIDataSource);
  96 };
  97
  98 #else  // USE_SOURCE_FILES_DIRECTLY
  99
 100 content::WebUIDataSource* CreateProfilerHTMLSource() {
 101   content::WebUIDataSource* source =
 102       content::WebUIDataSource::Create(chrome::kChromeUIProfilerHost);
 103
 104   source->SetJsonPath("strings.js");
 105   source->AddResourcePath("profiler.js", IDR_PROFILER_JS);
 106   source->SetDefaultResource(IDR_PROFILER_HTML);
 107   return source;
 108 }
 109
 110 #endif
 111
 112 // This class receives javascript messages from the renderer.
 113 // Note that the WebUI infrastructure runs on the UI thread, therefore all of
 114 // this class's methods are expected to run on the UI thread.
 115 class ProfilerMessageHandler : public WebUIMessageHandler {
 116  public:
 117   ProfilerMessageHandler() {}
 118
 119   // WebUIMessageHandler implementation.
 120   void RegisterMessages() override;
 121
 122   // Messages.
 123   void OnGetData(const base::ListValue* list);
 124
 125  private:
 126   DISALLOW_COPY_AND_ASSIGN(ProfilerMessageHandler);
 127 };
 128
 129 void ProfilerMessageHandler::RegisterMessages() {
 130   DCHECK_CURRENTLY_ON(BrowserThread::UI);
 131
 132   web_ui()->RegisterMessageCallback("getData",
 133       base::Bind(&ProfilerMessageHandler::OnGetData, base::Unretained(this)));
 134 }
 135
 136 void ProfilerMessageHandler::OnGetData(const base::ListValue* list) {
 137   ProfilerUI* profiler_ui = static_cast<ProfilerUI*>(web_ui()->GetController());
 138   profiler_ui->GetData();
 139 }
 140
 141 }  // namespace
 142
 143 ProfilerUI::ProfilerUI(content::WebUI* web_ui)
 144     : WebUIController(web_ui),
 145       weak_ptr_factory_(this) {
 146   web_ui->AddMessageHandler(new ProfilerMessageHandler());
 147
 148   // Set up the chrome://profiler/ source.
 149   Profile* profile = Profile::FromWebUI(web_ui);
 150 #if defined(USE_SOURCE_FILES_DIRECTLY)
 151   content::URLDataSource::Add(profile, new ProfilerWebUIDataSource);
 152 #else
 153   content::WebUIDataSource::Add(profile, CreateProfilerHTMLSource());
 154 #endif
 155 }
 156
 157 ProfilerUI::~ProfilerUI() {
 158 }
 159
 160 void ProfilerUI::GetData() {
 161   TrackingSynchronizer::FetchProfilerDataAsynchronously(
 162       weak_ptr_factory_.GetWeakPtr());
 163 }
 164
 165 void ProfilerUI::ReceivedProfilerData(
 166     const metrics::ProfilerDataAttributes& attributes,
 167     const tracked_objects::ProcessDataPhaseSnapshot& process_data_phase,
 168     const metrics::ProfilerEvents& past_events) {
 169   // Serialize the data to JSON.
 170   base::DictionaryValue json_data;
 171   task_profiler::TaskProfilerDataSerializer::ToValue(
 172       process_data_phase, attributes.process_id, attributes.process_type,
 173       &json_data);
 174
 175   // Send the data to the renderer.
 176   web_ui()->CallJavascriptFunction("g_browserBridge.receivedData", json_data);
 177 }