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// Copyright 2014 The Chromium 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 "extensions/renderer/render_frame_observer_natives.h"
#include "base/bind.h"
#include "base/macros.h"
#include "base/message_loop/message_loop.h"
#include "content/public/renderer/render_frame.h"
#include "content/public/renderer/render_frame_observer.h"
#include "extensions/renderer/extension_frame_helper.h"
#include "extensions/renderer/script_context.h"
namespace extensions {
namespace {
// Deletes itself when done.
class LoadWatcher : public content::RenderFrameObserver {
public:
LoadWatcher(content::RenderFrame* frame,
const base::Callback<void(bool)>& callback)
: content::RenderFrameObserver(frame), callback_(callback) {}
void DidCreateDocumentElement() override {
// Defer the callback instead of running it now to avoid re-entrancy caused
// by the JavaScript callback.
ExtensionFrameHelper::Get(render_frame())
->ScheduleAtDocumentStart(base::Bind(callback_, true));
delete this;
}
void DidFailProvisionalLoad(const blink::WebURLError& error) override {
// Use PostTask to avoid running user scripts while handling this
// DidFailProvisionalLoad notification.
base::MessageLoop::current()->PostTask(FROM_HERE,
base::Bind(callback_, false));
delete this;
}
private:
base::Callback<void(bool)> callback_;
DISALLOW_COPY_AND_ASSIGN(LoadWatcher);
};
} // namespace
RenderFrameObserverNatives::RenderFrameObserverNatives(ScriptContext* context)
: ObjectBackedNativeHandler(context), weak_ptr_factory_(this) {
RouteFunction(
"OnDocumentElementCreated",
base::Bind(&RenderFrameObserverNatives::OnDocumentElementCreated,
base::Unretained(this)));
}
RenderFrameObserverNatives::~RenderFrameObserverNatives() {}
void RenderFrameObserverNatives::Invalidate() {
weak_ptr_factory_.InvalidateWeakPtrs();
ObjectBackedNativeHandler::Invalidate();
}
void RenderFrameObserverNatives::OnDocumentElementCreated(
const v8::FunctionCallbackInfo<v8::Value>& args) {
CHECK(args.Length() == 2);
CHECK(args[0]->IsInt32());
CHECK(args[1]->IsFunction());
int frame_id = args[0]->Int32Value();
content::RenderFrame* frame = content::RenderFrame::FromRoutingID(frame_id);
if (!frame) {
LOG(WARNING) << "No render frame found to register LoadWatcher.";
return;
}
v8::Global<v8::Function> v8_callback(context()->isolate(),
args[1].As<v8::Function>());
base::Callback<void(bool)> callback(
base::Bind(&RenderFrameObserverNatives::InvokeCallback,
weak_ptr_factory_.GetWeakPtr(), base::Passed(&v8_callback)));
if (ExtensionFrameHelper::Get(frame)->did_create_current_document_element()) {
// If the document element is already created, then we can call the callback
// immediately (though use PostTask to ensure that the callback is called
// asynchronously).
base::MessageLoop::current()->PostTask(FROM_HERE,
base::Bind(callback, true));
} else {
new LoadWatcher(frame, callback);
}
args.GetReturnValue().Set(true);
}
void RenderFrameObserverNatives::InvokeCallback(
v8::Global<v8::Function> callback,
bool succeeded) {
v8::Isolate* isolate = context()->isolate();
v8::HandleScope handle_scope(isolate);
v8::Local<v8::Value> args[] = {v8::Boolean::New(isolate, succeeded)};
context()->CallFunction(v8::Local<v8::Function>::New(isolate, callback),
arraysize(args), args);
}
} // namespace extensions
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