cef/libcef/v8_impl.cc

// Copyright (c) 2011 The Chromium Embedded Framework 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 "browser_impl.h"
#include "v8_impl.h"
#include "cef_context.h"
#include "tracker.h"
#include "base/lazy_instance.h"
#include "third_party/WebKit/Source/WebKit/chromium/public/WebKit.h"
#include "third_party/WebKit/Source/WebKit/chromium/public/WebFrame.h"
#include "third_party/WebKit/Source/WebKit/chromium/public/WebScriptController.h"

#define CEF_REQUIRE_UI_THREAD(var) \
  if (!CefThread::CurrentlyOn(CefThread::UI)) { \
    NOTREACHED(); \
    return var; \
  }

#define CEF_REQUIRE_VALID_CONTEXT(var) \
  if (!CONTEXT_STATE_VALID()) { \
    NOTREACHED(); \
    return var; \
  }


namespace {

// Memory manager.

base::LazyInstance<CefTrackManager> g_v8_tracker(base::LINKER_INITIALIZED);

class TrackBase : public CefTrackObject
{
public:
  TrackBase(CefBase* base) { base_ = base; }

protected:
  CefRefPtr<CefBase> base_;
};

class TrackString : public CefTrackObject
{
public:
  TrackString(const std::string& str) : string_(str) {}
  const char* GetString() { return string_.c_str(); }

private:
  std::string string_;
};

void TrackAdd(CefTrackObject* object)
{
  g_v8_tracker.Pointer()->Add(object);
}

void TrackDelete(CefTrackObject* object)
{
  g_v8_tracker.Pointer()->Delete(object);
}

// Callback for weak persistent reference destruction.
void TrackDestructor(v8::Persistent<v8::Value> object, void* parameter)
{
  if(parameter)
    TrackDelete(static_cast<CefTrackObject*>(parameter));
  object.Dispose();
  object.Clear();
}


// Return the browser associated with the specified WebFrame.
CefRefPtr<CefBrowserImpl> FindBrowserForFrame(WebKit::WebFrame *frame)
{
  CefRefPtr<CefBrowserImpl> browser;

  CefContext::BrowserList *list;
  CefContext::BrowserList::const_iterator i;
  _Context->Lock();
  list = _Context->GetBrowserList();
  i = list->begin();
  for (; i != list->end(); ++i) {
    WebKit::WebFrame* thisframe = i->get()->UIT_GetMainWebFrame();
    if (thisframe == frame) {
      browser = i->get();
      break;
    }
  }
  _Context->Unlock();
  return browser;
}

// Convert a wide string to a V8 string.
v8::Handle<v8::String> GetV8String(const CefString& str)
{
  std::string tmpStr = str;
  return v8::String::New(tmpStr.c_str(), tmpStr.length());
}

// Convert a V8 string to a UTF8 string.
std::string GetString(v8::Handle<v8::String> str)
{
  // Allocate enough space for a worst-case conversion.
  int len = str->Utf8Length();
  char* buf = new char[len+1];
  str->WriteUtf8(buf, len+1);
  std::string ret(buf, len);
  delete [] buf;
  return ret;
}

// V8 function callback.
v8::Handle<v8::Value> FunctionCallbackImpl(const v8::Arguments& args)
{
  v8::HandleScope handle_scope;
  CefV8Handler* handler =
      static_cast<CefV8Handler*>(v8::External::Unwrap(args.Data()));
  
  CefV8ValueList params;
  for(int i = 0; i < args.Length(); i++)
    params.push_back(new CefV8ValueImpl(args[i]));

  CefString func_name =
      GetString(v8::Handle<v8::String>::Cast(args.Callee()->GetName()));
  CefRefPtr<CefV8Value> object = new CefV8ValueImpl(args.This());
  CefRefPtr<CefV8Value> retval;
  CefString exception;
  v8::Handle<v8::Value> value = v8::Null();

  if(handler->Execute(func_name, object, params, retval, exception)) {
    if(!exception.empty())
      value = v8::ThrowException(GetV8String(exception));
    else {
      CefV8ValueImpl* rv = static_cast<CefV8ValueImpl*>(retval.get());
      if(rv)
        value = rv->GetHandle();
    }
  }

  return value;
}


// V8 extension registration.

class ExtensionWrapper : public v8::Extension {
public:
  ExtensionWrapper(const char* extension_name,
                   const char* javascript_code,
                   CefV8Handler* handler)
    : v8::Extension(extension_name, javascript_code), handler_(handler)
  {
    // The reference will be released when the application exits.
    TrackAdd(new TrackBase(handler));
  }
  
  virtual v8::Handle<v8::FunctionTemplate> GetNativeFunction(
    v8::Handle<v8::String> name)
  {
    return v8::FunctionTemplate::New(FunctionCallbackImpl,
                                     v8::External::New(handler_));
  }

  void UIT_RegisterExtension()
  {
    WebKit::WebScriptController::registerExtension(this);
  }

  void AddRef() {}
  void Release() {}

  static bool ImplementsThreadSafeReferenceCounting() { return true; }

private:
  CefV8Handler* handler_;
};

} // namespace

bool CefRegisterExtension(const CefString& extension_name,
                          const CefString& javascript_code,
                          CefRefPtr<CefV8Handler> handler)
{
  // Verify that the context is in a valid state.
  CEF_REQUIRE_VALID_CONTEXT(false);

  if(!handler.get()) {
    NOTREACHED();
    return false;
  }

  TrackString* name = new TrackString(extension_name);
  TrackAdd(name);
  TrackString* code = new TrackString(javascript_code);
  TrackAdd(code);
  
  ExtensionWrapper* wrapper = new ExtensionWrapper(name->GetString(),
      code->GetString(), handler.get());
  
  CefThread::PostTask(CefThread::UI, FROM_HERE, NewRunnableMethod(wrapper,
      &ExtensionWrapper::UIT_RegisterExtension));
  return true;
}


// CefV8Context

// static
CefRefPtr<CefV8Context> CefV8Context::GetCurrentContext()
{
  CefRefPtr<CefV8Context> context;
  CEF_REQUIRE_VALID_CONTEXT(context);
  CEF_REQUIRE_UI_THREAD(context);
  if (v8::Context::InContext())
    context = new CefV8ContextImpl( v8::Context::GetCurrent() );
  return context;
}

// static
CefRefPtr<CefV8Context> CefV8Context::GetEnteredContext()
{
  CefRefPtr<CefV8Context> context;
  CEF_REQUIRE_VALID_CONTEXT(context);
  CEF_REQUIRE_UI_THREAD(context);
  if (v8::Context::InContext())
    context = new CefV8ContextImpl( v8::Context::GetEntered() );
  return context;
}


// CefV8ContextImpl

CefV8ContextImpl::CefV8ContextImpl(v8::Handle<v8::Context> context)
{
  v8_context_ = new CefV8ContextHandle(context);
}

CefV8ContextImpl::~CefV8ContextImpl()
{
}

CefRefPtr<CefBrowser> CefV8ContextImpl::GetBrowser()
{
  CefRefPtr<CefBrowser> browser;
  CEF_REQUIRE_UI_THREAD(browser);

  WebKit::WebFrame* webframe = GetWebFrame();
  if (webframe)
    browser = FindBrowserForFrame(webframe->top());

  return browser;
}

CefRefPtr<CefFrame> CefV8ContextImpl::GetFrame()
{
  CefRefPtr<CefFrame> frame;
  CEF_REQUIRE_UI_THREAD(frame);

  WebKit::WebFrame* webframe = GetWebFrame();
  if (webframe) {
    CefRefPtr<CefBrowserImpl> browser;
    browser = FindBrowserForFrame(webframe->top());
    if (browser.get())
      frame = browser->UIT_GetCefFrame(webframe);
  }

  return frame;
}

CefRefPtr<CefV8Value> CefV8ContextImpl::GetGlobal()
{
  CEF_REQUIRE_UI_THREAD(NULL);

  v8::HandleScope handle_scope;
  v8::Context::Scope context_scope(v8_context_->GetHandle());
  return new CefV8ValueImpl(v8_context_->GetHandle()->Global());
}

v8::Local<v8::Context> CefV8ContextImpl::GetContext()
{
  return v8::Local<v8::Context>::New(v8_context_->GetHandle());
}

WebKit::WebFrame* CefV8ContextImpl::GetWebFrame()
{
  v8::HandleScope handle_scope;
  v8::Context::Scope context_scope(v8_context_->GetHandle());
  WebKit::WebFrame* frame = WebKit::WebFrame::frameForCurrentContext();
  return frame;
}


// CefV8ValueHandle

// Custom destructor for a v8 value handle which gets called only on the UI
// thread.
CefV8ValueHandle::~CefV8ValueHandle()
{
  if(tracker_)
    TrackAdd(tracker_);
  v8_handle_.MakeWeak(tracker_, TrackDestructor);
  tracker_ = NULL;
}


// CefV8Value

// static
CefRefPtr<CefV8Value> CefV8Value::CreateUndefined()
{
  CEF_REQUIRE_VALID_CONTEXT(NULL);
  CEF_REQUIRE_UI_THREAD(NULL);
  v8::HandleScope handle_scope;
  return new CefV8ValueImpl(v8::Undefined());
}

// static
CefRefPtr<CefV8Value> CefV8Value::CreateNull()
{
  CEF_REQUIRE_VALID_CONTEXT(NULL);
  CEF_REQUIRE_UI_THREAD(NULL);
  v8::HandleScope handle_scope;
  return new CefV8ValueImpl(v8::Null());
}

// static
CefRefPtr<CefV8Value> CefV8Value::CreateBool(bool value)
{
  CEF_REQUIRE_VALID_CONTEXT(NULL);
  CEF_REQUIRE_UI_THREAD(NULL);
  v8::HandleScope handle_scope;
  return new CefV8ValueImpl(v8::Boolean::New(value));
}

// static
CefRefPtr<CefV8Value> CefV8Value::CreateInt(int value)
{
  CEF_REQUIRE_VALID_CONTEXT(NULL);
  CEF_REQUIRE_UI_THREAD(NULL);
  v8::HandleScope handle_scope;
  return new CefV8ValueImpl(v8::Int32::New(value));
}

// static
CefRefPtr<CefV8Value> CefV8Value::CreateDouble(double value)
{
  CEF_REQUIRE_VALID_CONTEXT(NULL);
  CEF_REQUIRE_UI_THREAD(NULL);
  v8::HandleScope handle_scope;
  return new CefV8ValueImpl(v8::Number::New(value));
}

// static
CefRefPtr<CefV8Value> CefV8Value::CreateString(const CefString& value)
{
  CEF_REQUIRE_VALID_CONTEXT(NULL);
  CEF_REQUIRE_UI_THREAD(NULL);
  v8::HandleScope handle_scope;
  return new CefV8ValueImpl(GetV8String(value));
}

// static
CefRefPtr<CefV8Value> CefV8Value::CreateObject(CefRefPtr<CefBase> user_data)
{
  CEF_REQUIRE_VALID_CONTEXT(NULL);
  CEF_REQUIRE_UI_THREAD(NULL);

  v8::HandleScope handle_scope;

  // Create the new V8 object.
  v8::Local<v8::Object> obj = v8::Object::New();

  TrackBase *tracker = NULL;
  if (user_data.get()) {
    // Attach the user data to the V8 object.
    v8::Local<v8::Value> data = v8::External::Wrap(user_data.get());
    obj->Set(v8::String::New("Cef::UserData"), data);

    // Provide a tracker object that will cause the user data reference to be
    // released when the V8 object is destroyed.
    tracker = new TrackBase(user_data);
  }

  return new CefV8ValueImpl(obj, tracker);
}

// static
CefRefPtr<CefV8Value> CefV8Value::CreateArray()
{
  CEF_REQUIRE_VALID_CONTEXT(NULL);
  CEF_REQUIRE_UI_THREAD(NULL);

  v8::HandleScope handle_scope;
  return new CefV8ValueImpl(v8::Array::New());
}

// static
CefRefPtr<CefV8Value> CefV8Value::CreateFunction(const CefString& name,
                                               CefRefPtr<CefV8Handler> handler)
{
  CEF_REQUIRE_VALID_CONTEXT(NULL);
  CEF_REQUIRE_UI_THREAD(NULL);

  v8::HandleScope handle_scope;
  
  // Create a new V8 function template with one internal field.
  v8::Local<v8::FunctionTemplate> tmpl = v8::FunctionTemplate::New();
  
  v8::Local<v8::Value> data = v8::External::Wrap(handler.get());

  // Set the function handler callback.
  tmpl->SetCallHandler(FunctionCallbackImpl, data);

  // Retrieve the function object and set the name.
  v8::Local<v8::Function> func = tmpl->GetFunction();
  func->SetName(GetV8String(name));

  // Attach the handler instance to the V8 object.
  func->Set(v8::String::New("Cef::Handler"), data);

  // Create the CefV8ValueImpl and provide a tracker object that will cause
  // the handler reference to be released when the V8 object is destroyed.
  return new CefV8ValueImpl(func, new TrackBase(handler));
}


// CefV8ValueImpl

CefV8ValueImpl::CefV8ValueImpl(v8::Handle<v8::Value> value,
                               CefTrackObject* tracker)
{
  v8_value_ = new CefV8ValueHandle(value, tracker);
}

CefV8ValueImpl::~CefV8ValueImpl()
{
}

bool CefV8ValueImpl::IsUndefined()
{
  CEF_REQUIRE_UI_THREAD(false);
  return GetHandle()->IsUndefined();
}

bool CefV8ValueImpl::IsNull()
{
  CEF_REQUIRE_UI_THREAD(false);
  return GetHandle()->IsNull();
}

bool CefV8ValueImpl::IsBool()
{
  CEF_REQUIRE_UI_THREAD(false);
  return (GetHandle()->IsBoolean() || GetHandle()->IsTrue()
             || GetHandle()->IsFalse());
}

bool CefV8ValueImpl::IsInt()
{
  CEF_REQUIRE_UI_THREAD(false);
  return GetHandle()->IsInt32();
}

bool CefV8ValueImpl::IsDouble()
{
  CEF_REQUIRE_UI_THREAD(false);
  return (GetHandle()->IsNumber() || GetHandle()->IsDate());
}

bool CefV8ValueImpl::IsString()
{
  CEF_REQUIRE_UI_THREAD(false);
  return GetHandle()->IsString();
}

bool CefV8ValueImpl::IsObject()
{
  CEF_REQUIRE_UI_THREAD(false);
  return GetHandle()->IsObject();
}

bool CefV8ValueImpl::IsArray()
{
  CEF_REQUIRE_UI_THREAD(false);
  return GetHandle()->IsArray();
}

bool CefV8ValueImpl::IsFunction()
{
  CEF_REQUIRE_UI_THREAD(false);
  return GetHandle()->IsFunction();
}

bool CefV8ValueImpl::GetBoolValue()
{
  CEF_REQUIRE_UI_THREAD(false);
  if (GetHandle()->IsTrue()) {
    return true;
  } else if(GetHandle()->IsFalse()) {
    return false;
  } else {
    v8::HandleScope handle_scope;
    v8::Local<v8::Boolean> val = GetHandle()->ToBoolean();
    return val->Value();
  }
}

int CefV8ValueImpl::GetIntValue()
{
  CEF_REQUIRE_UI_THREAD(0);
  v8::HandleScope handle_scope;
  v8::Local<v8::Int32> val = GetHandle()->ToInt32();
  return val->Value();
}

double CefV8ValueImpl::GetDoubleValue()
{
  CEF_REQUIRE_UI_THREAD(0.);
  v8::HandleScope handle_scope;
  v8::Local<v8::Number> val = GetHandle()->ToNumber();
  return val->Value();
}

CefString CefV8ValueImpl::GetStringValue()
{
  CefString rv;
  CEF_REQUIRE_UI_THREAD(rv);
  v8::HandleScope handle_scope;
  rv = GetString(GetHandle()->ToString());
  return rv;
}

bool CefV8ValueImpl::HasValue(const CefString& key)
{
  CEF_REQUIRE_UI_THREAD(false);
  if(IsReservedKey(key))
    return false;
  if(!GetHandle()->IsObject()) {
    NOTREACHED();
    return false;
  }

  v8::HandleScope handle_scope;
  v8::Local<v8::Object> obj = GetHandle()->ToObject();
  return obj->Has(GetV8String(key));
}

bool CefV8ValueImpl::HasValue(int index)
{
  CEF_REQUIRE_UI_THREAD(false);
  if(!GetHandle()->IsObject()) {
    NOTREACHED();
    return false;
  }
  
  v8::HandleScope handle_scope;
  v8::Local<v8::Object> obj = GetHandle()->ToObject();
  return obj->Has(index);
}

bool CefV8ValueImpl::DeleteValue(const CefString& key)
{
  CEF_REQUIRE_UI_THREAD(false);
  if(IsReservedKey(key))
    return false;
  if(!GetHandle()->IsObject()) {
    NOTREACHED();
    return false;
  }
  
  v8::HandleScope handle_scope;
  v8::Local<v8::Object> obj = GetHandle()->ToObject();
  return obj->Delete(GetV8String(key));
}

bool CefV8ValueImpl::DeleteValue(int index)
{
  CEF_REQUIRE_UI_THREAD(false);
  if(!GetHandle()->IsObject()) {
    NOTREACHED();
    return false;
  }
  
  v8::HandleScope handle_scope;
  v8::Local<v8::Object> obj = GetHandle()->ToObject();
  return obj->Delete(index);
}

CefRefPtr<CefV8Value> CefV8ValueImpl::GetValue(const CefString& key)
{
  CEF_REQUIRE_UI_THREAD(NULL);
  if(IsReservedKey(key))
    return NULL;
  if(!GetHandle()->IsObject()) {
    NOTREACHED();
    return false;
  }
 
  v8::HandleScope handle_scope;
  v8::Local<v8::Object> obj = GetHandle()->ToObject();
  return new CefV8ValueImpl(obj->Get(GetV8String(key)));
}

CefRefPtr<CefV8Value> CefV8ValueImpl::GetValue(int index)
{
  CEF_REQUIRE_UI_THREAD(NULL);
  if(!GetHandle()->IsObject()) {
    NOTREACHED();
    return false;
  }

  v8::HandleScope handle_scope;
  v8::Local<v8::Object> obj = GetHandle()->ToObject();
  return new CefV8ValueImpl(obj->Get(v8::Number::New(index)));
}

bool CefV8ValueImpl::SetValue(const CefString& key,
                              CefRefPtr<CefV8Value> value)
{
  CEF_REQUIRE_UI_THREAD(false);
  if(IsReservedKey(key))
    return false;
  if(!GetHandle()->IsObject()) {
    NOTREACHED();
    return false;
  }

  CefV8ValueImpl *impl = static_cast<CefV8ValueImpl*>(value.get());
  if(impl) {
    v8::HandleScope handle_scope;
    v8::Local<v8::Object> obj = GetHandle()->ToObject();
    return obj->Set(GetV8String(key), impl->GetHandle());
  } else {
    NOTREACHED();
    return false;
  }
}

bool CefV8ValueImpl::SetValue(int index, CefRefPtr<CefV8Value> value)
{
  CEF_REQUIRE_UI_THREAD(false);
  if(!GetHandle()->IsObject()) {
    NOTREACHED();
    return false;
  }

  CefV8ValueImpl *impl = static_cast<CefV8ValueImpl*>(value.get());
  if(impl) {
    v8::HandleScope handle_scope;
    v8::Local<v8::Object> obj = GetHandle()->ToObject();
    return obj->Set(v8::Number::New(index), impl->GetHandle());
  } else {
    NOTREACHED();
    return false;
  }
}

bool CefV8ValueImpl::GetKeys(std::vector<CefString>& keys)
{
  CEF_REQUIRE_UI_THREAD(false);
  if(!GetHandle()->IsObject()) {
    NOTREACHED();
    return false;
  }
  
  v8::HandleScope handle_scope;
  v8::Local<v8::Object> obj = GetHandle()->ToObject();
  v8::Local<v8::Array> arr_keys = obj->GetPropertyNames();
  uint32_t len = arr_keys->Length();
  for(uint32_t i = 0; i < len; ++i) {
    v8::Local<v8::Value> value = arr_keys->Get(v8::Integer::New(i));
    CefString str = GetString(value->ToString());
    if(!IsReservedKey(str))
      keys.push_back(str);
  }
  return true;
}

CefRefPtr<CefBase> CefV8ValueImpl::GetUserData()
{
  CEF_REQUIRE_UI_THREAD(NULL);
  if(!GetHandle()->IsObject()) {
    NOTREACHED();
    return NULL;
  }
  
  v8::HandleScope handle_scope;
  v8::Local<v8::Object> obj = GetHandle()->ToObject();
  v8::Local<v8::String> key = v8::String::New("Cef::UserData");
  if(obj->Has(key))
    return static_cast<CefBase*>(v8::External::Unwrap(obj->Get(key)));
  return NULL;
}

int CefV8ValueImpl::GetArrayLength()
{
  CEF_REQUIRE_UI_THREAD(0);
  if(!GetHandle()->IsArray()) {
    NOTREACHED();
    return 0;
  }

  v8::HandleScope handle_scope;
  v8::Local<v8::Object> obj = GetHandle()->ToObject();
  v8::Local<v8::Array> arr = v8::Local<v8::Array>::Cast(obj);
  return arr->Length();
}

CefString CefV8ValueImpl::GetFunctionName()
{
  CefString rv;
  CEF_REQUIRE_UI_THREAD(rv);
  if(!GetHandle()->IsFunction()) {
    NOTREACHED();
    return rv;
  }
  
  v8::HandleScope handle_scope;
  v8::Local<v8::Object> obj = GetHandle()->ToObject();
  v8::Local<v8::Function> func = v8::Local<v8::Function>::Cast(obj);
  rv = GetString(v8::Handle<v8::String>::Cast(func->GetName()));
  return rv;
}

CefRefPtr<CefV8Handler> CefV8ValueImpl::GetFunctionHandler()
{
  CEF_REQUIRE_UI_THREAD(NULL);
  if(!GetHandle()->IsFunction()) {
    NOTREACHED();
    return NULL;
  }

  v8::HandleScope handle_scope;
  v8::Local<v8::Object> obj = GetHandle()->ToObject();
  v8::Local<v8::String> key = v8::String::New("Cef::Handler");
  if (obj->Has(key))
    return static_cast<CefV8Handler*>(v8::External::Unwrap(obj->Get(key)));
  return NULL;
}

bool CefV8ValueImpl::ExecuteFunction(CefRefPtr<CefV8Value> object,
                                     const CefV8ValueList& arguments,
                                     CefRefPtr<CefV8Value>& retval,
                                     CefString& exception)
{
  // An empty context value defaults to the current context.
  CefRefPtr<CefV8Context> context;
  return ExecuteFunctionWithContext(context, object, arguments, retval, 
                                    exception);
}

bool CefV8ValueImpl::ExecuteFunctionWithContext(
    CefRefPtr<CefV8Context> context,
    CefRefPtr<CefV8Value> object,
    const CefV8ValueList& arguments,
    CefRefPtr<CefV8Value>& retval,
    CefString& exception)
{
  CEF_REQUIRE_UI_THREAD(false);
  if(!GetHandle()->IsFunction()) {
    NOTREACHED();
    return false;
  }

  v8::HandleScope handle_scope;

  v8::Local<v8::Context> context_local;
  if (context.get()) {
    CefV8ContextImpl* context_impl =
        static_cast<CefV8ContextImpl*>(context.get());
    context_local = context_impl->GetContext();
  } else {
    context_local = v8::Context::GetCurrent();
  }

  v8::Context::Scope context_scope(context_local);

  v8::Local<v8::Object> obj = GetHandle()->ToObject();
  v8::Local<v8::Function> func = v8::Local<v8::Function>::Cast(obj);
  v8::Handle<v8::Object> recv;

  // Default to the global object if no object or a non-object was provided.
  if (object.get() && object->IsObject()) {
    CefV8ValueImpl* recv_impl = static_cast<CefV8ValueImpl*>(object.get());
    recv = v8::Handle<v8::Object>::Cast(recv_impl->GetHandle());
  } else {
    recv = context_local->Global();
  }

  int argc = arguments.size();
  v8::Handle<v8::Value> *argv = NULL;
  if (argc > 0) {
    argv = new v8::Handle<v8::Value>[argc];
    for (int i = 0; i < argc; ++i)
      argv[i] = static_cast<CefV8ValueImpl*>(arguments[i].get())->GetHandle();
  }

  v8::TryCatch try_catch;
  v8::Local<v8::Value> func_rv = func->Call(recv, argc, argv);
  if (try_catch.HasCaught())
    exception = GetString(try_catch.Message()->Get());
  else
    retval = new CefV8ValueImpl(func_rv);

  return true;
}

bool CefV8ValueImpl::IsReservedKey(const CefString& key)
{
  std::string str = key;
  return (str.find("Cef::") == 0 || str.find("v8::") == 0);
}