chrome/renderer/extensions/console.cc

   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 "chrome/renderer/extensions/console.h"
   6
   7 #include "base/compiler_specific.h"
   8 #include "base/debug/alias.h"
   9 #include "base/lazy_instance.h"
  10 #include "base/strings/string_util.h"
  11 #include "base/strings/stringprintf.h"
  12 #include "base/strings/utf_string_conversions.h"
  13 #include "chrome/renderer/extensions/dispatcher.h"
  14 #include "chrome/renderer/extensions/extension_helper.h"
  15 #include "content/public/renderer/render_view.h"
  16 #include "content/public/renderer/render_view_visitor.h"
  17 #include "third_party/WebKit/public/web/WebConsoleMessage.h"
  18 #include "third_party/WebKit/public/web/WebFrame.h"
  19 #include "third_party/WebKit/public/web/WebView.h"
  20
  21 namespace extensions {
  22 namespace console {
  23
  24 namespace {
  25
  26 // Finds the RenderView associated with a context. Note: there will be multiple
  27 // contexts in each RenderView.
  28 class ByContextFinder : public content::RenderViewVisitor {
  29  public:
  30   static content::RenderView* Find(v8::Handle<v8::Context> context) {
  31     ByContextFinder finder(context);
  32     content::RenderView::ForEach(&finder);
  33     return finder.found_;
  34   }
  35
  36  private:
  37   explicit ByContextFinder(v8::Handle<v8::Context> context)
  38       : context_(context), found_(NULL) {
  39   }
  40
  41   virtual bool Visit(content::RenderView* render_view) OVERRIDE {
  42     ExtensionHelper* helper = ExtensionHelper::Get(render_view);
  43     if (helper &&
  44         helper->dispatcher()->v8_context_set().GetByV8Context(context_)) {
  45       found_ = render_view;
  46     }
  47     return !found_;
  48   }
  49
  50   v8::Handle<v8::Context> context_;
  51   content::RenderView* found_;
  52
  53   DISALLOW_COPY_AND_ASSIGN(ByContextFinder);
  54 };
  55
  56 // Writes |message| to stack to show up in minidump, then crashes.
  57 void CheckWithMinidump(const std::string& message) {
  58   char minidump[1024];
  59   base::debug::Alias(&minidump);
  60   base::snprintf(minidump, arraysize(minidump),
  61                  "e::console: %s", message.c_str());
  62   CHECK(false) << message;
  63 }
  64
  65 typedef void (*LogMethod)(v8::Handle<v8::Context> context,
  66                           const std::string& message);
  67
  68 void BoundLogMethodCallback(const v8::FunctionCallbackInfo<v8::Value>& info) {
  69   LogMethod log_method = reinterpret_cast<LogMethod>(
  70       info.Data().As<v8::External>()->Value());
  71   std::string message;
  72   for (int i = 0; i < info.Length(); ++i) {
  73     if (i > 0)
  74       message += " ";
  75     message += *v8::String::Utf8Value(info[i]);
  76   }
  77   (*log_method)(info.GetIsolate()->GetCallingContext(), message);
  78 }
  79
  80 void BindLogMethod(v8::Isolate* isolate,
  81                    v8::Local<v8::Object> target,
  82                    const std::string& name,
  83                    LogMethod log_method) {
  84   v8::Local<v8::FunctionTemplate> tmpl = v8::FunctionTemplate::New(
  85       isolate,
  86       &BoundLogMethodCallback,
  87       v8::External::New(isolate, reinterpret_cast<void*>(log_method)));
  88   target->Set(v8::String::NewFromUtf8(isolate, name.c_str()),
  89               tmpl->GetFunction());
  90 }
  91
  92 }  // namespace
  93
  94 void Debug(content::RenderView* render_view, const std::string& message) {
  95   AddMessage(render_view, content::CONSOLE_MESSAGE_LEVEL_DEBUG, message);
  96 }
  97
  98 void Log(content::RenderView* render_view, const std::string& message) {
  99   AddMessage(render_view, content::CONSOLE_MESSAGE_LEVEL_LOG, message);
 100 }
 101
 102 void Warn(content::RenderView* render_view, const std::string& message) {
 103   AddMessage(render_view, content::CONSOLE_MESSAGE_LEVEL_WARNING, message);
 104 }
 105
 106 void Error(content::RenderView* render_view, const std::string& message) {
 107   AddMessage(render_view, content::CONSOLE_MESSAGE_LEVEL_ERROR, message);
 108 }
 109
 110 void Fatal(content::RenderView* render_view, const std::string& message) {
 111   Error(render_view, message);
 112   CheckWithMinidump(message);
 113 }
 114
 115 void AddMessage(content::RenderView* render_view,
 116                 content::ConsoleMessageLevel level,
 117                 const std::string& message) {
 118   blink::WebView* web_view = render_view->GetWebView();
 119   if (!web_view || !web_view->mainFrame())
 120     return;
 121   blink::WebConsoleMessage::Level target_level =
 122       blink::WebConsoleMessage::LevelLog;
 123   switch (level) {
 124     case content::CONSOLE_MESSAGE_LEVEL_DEBUG:
 125       target_level = blink::WebConsoleMessage::LevelDebug;
 126       break;
 127     case content::CONSOLE_MESSAGE_LEVEL_LOG:
 128       target_level = blink::WebConsoleMessage::LevelLog;
 129       break;
 130     case content::CONSOLE_MESSAGE_LEVEL_WARNING:
 131       target_level = blink::WebConsoleMessage::LevelWarning;
 132       break;
 133     case content::CONSOLE_MESSAGE_LEVEL_ERROR:
 134       target_level = blink::WebConsoleMessage::LevelError;
 135       break;
 136   }
 137   web_view->mainFrame()->addMessageToConsole(
 138       blink::WebConsoleMessage(target_level, base::UTF8ToUTF16(message)));
 139 }
 140
 141 void Debug(v8::Handle<v8::Context> context, const std::string& message) {
 142   AddMessage(context, content::CONSOLE_MESSAGE_LEVEL_DEBUG, message);
 143 }
 144
 145 void Log(v8::Handle<v8::Context> context, const std::string& message) {
 146   AddMessage(context, content::CONSOLE_MESSAGE_LEVEL_LOG, message);
 147 }
 148
 149 void Warn(v8::Handle<v8::Context> context, const std::string& message) {
 150   AddMessage(context, content::CONSOLE_MESSAGE_LEVEL_WARNING, message);
 151 }
 152
 153 void Error(v8::Handle<v8::Context> context, const std::string& message) {
 154   AddMessage(context, content::CONSOLE_MESSAGE_LEVEL_ERROR, message);
 155 }
 156
 157 void Fatal(v8::Handle<v8::Context> context, const std::string& message) {
 158   Error(context, message);
 159   CheckWithMinidump(message);
 160 }
 161
 162 void AddMessage(v8::Handle<v8::Context> context,
 163                 content::ConsoleMessageLevel level,
 164                 const std::string& message) {
 165   if (context.IsEmpty()) {
 166     LOG(WARNING) << "Could not log \"" << message << "\": no context given";
 167     return;
 168   }
 169   content::RenderView* render_view = ByContextFinder::Find(context);
 170   if (!render_view) {
 171     LOG(WARNING) << "Could not log \"" << message << "\": no render view found";
 172     return;
 173   }
 174   AddMessage(render_view, level, message);
 175 }
 176
 177 v8::Local<v8::Object> AsV8Object() {
 178   v8::Isolate* isolate = v8::Isolate::GetCurrent();
 179   v8::EscapableHandleScope handle_scope(isolate);
 180   v8::Local<v8::Object> console_object = v8::Object::New(isolate);
 181   BindLogMethod(isolate, console_object, "debug", &Debug);
 182   BindLogMethod(isolate, console_object, "log", &Log);
 183   BindLogMethod(isolate, console_object, "warn", &Warn);
 184   BindLogMethod(isolate, console_object, "error", &Error);
 185   return handle_scope.Escape(console_object);
 186 }
 187
 188 }  // namespace console
 189 }  // namespace extensions