chromecast/renderer/cast_gin_runner.h

// Copyright 2016 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.

#ifndef CHROMECAST_RENDERER_CAST_GIN_RUNNER_H_
#define CHROMECAST_RENDERER_CAST_GIN_RUNNER_H_

#include "base/macros.h"
#include "base/supports_user_data.h"
#include "content/public/renderer/render_frame_observer.h"
#include "gin/runner.h"

namespace {
const char kCastContextData[] = "CastContextData";
}

namespace blink {
class WebFrame;
}

namespace chromecast {
namespace shell {

// Implementation of gin::Runner that forwards Runner functions to WebFrame.
class CastGinRunner : public gin::Runner,
                      public base::SupportsUserData::Data,
                      public content::RenderFrameObserver {
 public:
  // Does not take ownership of ContextHolder.
  CastGinRunner(content::RenderFrame* render_frame);
  ~CastGinRunner() override;

  // gin:Runner implementation:
  void Run(const std::string& source,
           const std::string& resource_name) override;
  v8::Local<v8::Value> Call(v8::Local<v8::Function> function,
                            v8::Local<v8::Value> receiver,
                            int argc,
                            v8::Local<v8::Value> argv[]) override;
  gin::ContextHolder* GetContextHolder() override;

  // content::RenderFrameObserver implementation:
  void WillReleaseScriptContext(v8::Local<v8::Context> context,
                                int world_id) override;
  void DidClearWindowObject() override;
  void OnDestruct() override;

 private:
  void RemoveUserDataFromMainWorldContext();
  void RemoveUserData(v8::Local<v8::Context> context);

  // Frame to execute script in.
  blink::WebFrame* const frame_;

  // Created by blink bindings to V8.
  gin::ContextHolder* const context_holder_;

  DISALLOW_COPY_AND_ASSIGN(CastGinRunner);
};

}  // namespace shell
}  // namespace chromecast

#endif  // CHROMECAST_RENDERER_CAST_GIN_RUNNER_H_