Refactor GuestViewContainer to split out WebView related logic and MimeHandlerView related logic.

extensions/renderer/guest_view/guest_view_container.cc

 // 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/guest_view/guest_view_container.h"
 
-#include "content/public/renderer/browser_plugin_delegate.h"
 #include "content/public/renderer/render_frame.h"
 #include "content/public/renderer/render_view.h"
-#include "extensions/common/extension_messages.h"
 #include "extensions/common/guest_view/guest_view_constants.h"
-#include "third_party/WebKit/public/web/WebLocalFrame.h"
-#include "third_party/WebKit/public/web/WebScopedMicrotaskSuppression.h"
-#include "third_party/WebKit/public/web/WebView.h"
-
-namespace {
-typedef std::pair<int, int> GuestViewID;
-typedef std::map<GuestViewID, extensions::GuestViewContainer*>
-    GuestViewContainerMap;
-static base::LazyInstance<GuestViewContainerMap> g_guest_view_container_map =
-    LAZY_INSTANCE_INITIALIZER;
-}  // namespace
 
 namespace extensions {
 
-GuestViewContainer::AttachRequest::AttachRequest(
-    int element_instance_id,
-    int guest_instance_id,
-    scoped_ptr<base::DictionaryValue> params,
-    v8::Handle<v8::Function> callback,
-    v8::Isolate* isolate)
-    : element_instance_id_(element_instance_id),
-      guest_instance_id_(guest_instance_id),
-      params_(params.Pass()),
-      callback_(callback),
-      isolate_(isolate) {
+GuestViewContainer::GuestViewContainer(content::RenderFrame* render_frame)
+    : content::RenderFrameObserver(render_frame),
+      element_instance_id_(guestview::kInstanceIDNone),
+      render_view_routing_id_(render_frame->GetRenderView()->GetRoutingID()) {
 }
 
-GuestViewContainer::AttachRequest::~AttachRequest() {
-}
-
-bool GuestViewContainer::AttachRequest::HasCallback() const {
-  return !callback_.IsEmpty();
-}
-
-v8::Handle<v8::Function>
-GuestViewContainer::AttachRequest::GetCallback() const {
-  return callback_.NewHandle(isolate_);
-}
-
-GuestViewContainer::GuestViewContainer(
-    content::RenderFrame* render_frame,
-    const std::string& mime_type)
-    : content::BrowserPluginDelegate(render_frame, mime_type),
-      content::RenderFrameObserver(render_frame),
-      mime_type_(mime_type),
-      element_instance_id_(guestview::kInstanceIDNone),
-      render_view_routing_id_(render_frame->GetRenderView()->GetRoutingID()),
-      attached_(false),
-      ready_(false) {
-}
-
-GuestViewContainer::~GuestViewContainer() {
-  if (element_instance_id_ != guestview::kInstanceIDNone) {
-    g_guest_view_container_map.Get().erase(
-        GuestViewID(render_view_routing_id_, element_instance_id_));
-  }
-}
-
-GuestViewContainer* GuestViewContainer::FromID(int render_view_routing_id,
-                                               int element_instance_id) {
-  GuestViewContainerMap* guest_view_containers =
-      g_guest_view_container_map.Pointer();
-  GuestViewContainerMap::iterator it = guest_view_containers->find(
-      GuestViewID(render_view_routing_id, element_instance_id));
-  return it == guest_view_containers->end() ? NULL : it->second;
-}
-
-void GuestViewContainer::AttachGuest(linked_ptr<AttachRequest> request) {
-  EnqueueAttachRequest(request);
-  PerformPendingAttachRequest();
-}
+GuestViewContainer::~GuestViewContainer() {}
 
 void GuestViewContainer::SetElementInstanceID(int element_instance_id) {
-  GuestViewID guest_view_id(render_view_routing_id_, element_instance_id);
   DCHECK_EQ(element_instance_id_, guestview::kInstanceIDNone);
-  DCHECK(g_guest_view_container_map.Get().find(guest_view_id) ==
-            g_guest_view_container_map.Get().end());
   element_instance_id_ = element_instance_id;
-  g_guest_view_container_map.Get().insert(std::make_pair(guest_view_id, this));
-}
-
-void GuestViewContainer::DidFinishLoading() {
-  if (mime_type_.empty())
-    return;
-
-  DCHECK_NE(element_instance_id_, guestview::kInstanceIDNone);
-  render_frame()->Send(new ExtensionHostMsg_CreateMimeHandlerViewGuest(
-      routing_id(), html_string_, mime_type_, element_instance_id_));
-}
-
-void GuestViewContainer::DidReceiveData(const char* data, int data_length) {
-  std::string value(data, data_length);
-  html_string_ += value;
-}
-
-void GuestViewContainer::Ready() {
-  ready_ = true;
-  CHECK(!pending_response_.get());
-  PerformPendingAttachRequest();
 }
 
 void GuestViewContainer::OnDestruct() {
   // GuestViewContainer's lifetime is managed by BrowserPlugin so don't let
   // RenderFrameObserver self-destruct here.
 }
 
-bool GuestViewContainer::OnMessageReceived(const IPC::Message& message) {
-  if (!ShouldHandleMessage(message))
+bool GuestViewContainer::OnMessageReceived(
+    const IPC::Message& message) {
+  if (!HandlesMessage(message))
     return false;
 
   DCHECK_NE(element_instance_id_, guestview::kInstanceIDNone);
   int element_instance_id = guestview::kInstanceIDNone;
   PickleIterator iter(message);
   bool success = iter.ReadInt(&element_instance_id);
   DCHECK(success);
   if (element_instance_id != element_instance_id_)
     return false;
 
-  bool handled = true;
-  IPC_BEGIN_MESSAGE_MAP(GuestViewContainer, message)
-    IPC_MESSAGE_HANDLER(ExtensionMsg_CreateMimeHandlerViewGuestACK,
-                        OnCreateMimeHandlerViewGuestACK)
-    IPC_MESSAGE_HANDLER(ExtensionMsg_GuestAttached, OnGuestAttached)
-    IPC_MESSAGE_UNHANDLED(handled = false)
-  IPC_END_MESSAGE_MAP()
-  return handled;
-}
-
-void GuestViewContainer::OnCreateMimeHandlerViewGuestACK(
-    int element_instance_id) {
-  DCHECK_NE(element_instance_id_, guestview::kInstanceIDNone);
-  DCHECK_EQ(element_instance_id_, element_instance_id);
-  DCHECK(!mime_type_.empty());
-  render_frame()->AttachGuest(element_instance_id);
-}
-
-void GuestViewContainer::OnGuestAttached(int element_instance_id,
-                                         int guest_proxy_routing_id) {
-  attached_ = true;
-
-  if (!mime_type_.empty()) {
-    // MimeHandlerView's creation and attachment is not done via JS API.
-    return;
-  }
-
-  // Handle the callback for the current request with a pending response.
-  HandlePendingResponseCallback(guest_proxy_routing_id);
-  // Perform the subsequent attach request if one exists.
-  PerformPendingAttachRequest();
-}
-
-void GuestViewContainer::AttachGuestInternal(
-    linked_ptr<AttachRequest> request) {
-  CHECK(!pending_response_.get());
-  // Step 1, send the attach params to chrome/.
-  render_frame()->Send(
-      new ExtensionHostMsg_AttachGuest(render_view_routing_id_,
-                                       request->element_instance_id(),
-                                       request->guest_instance_id(),
-                                       *request->attach_params()));
-
-  // Step 2, attach plugin through content/.
-  render_frame()->AttachGuest(request->element_instance_id());
-
-  pending_response_ = request;
-}
-
-void GuestViewContainer::EnqueueAttachRequest(
-    linked_ptr<AttachRequest> request) {
-  pending_requests_.push_back(request);
-}
-
-void GuestViewContainer::PerformPendingAttachRequest() {
-  if (!ready_ || pending_requests_.empty() || pending_response_.get())
-    return;
-
-  linked_ptr<AttachRequest> pending_request = pending_requests_.front();
-  pending_requests_.pop_front();
-  AttachGuestInternal(pending_request);
-}
-
-void GuestViewContainer::HandlePendingResponseCallback(
-    int guest_proxy_routing_id) {
-  CHECK(pending_response_.get());
-  linked_ptr<AttachRequest> pending_response(pending_response_.release());
-
-  // If we don't have a callback then there's nothing more to do.
-  if (!pending_response->HasCallback())
-    return;
-
-  content::RenderView* guest_proxy_render_view =
-      content::RenderView::FromRoutingID(guest_proxy_routing_id);
-  // TODO(fsamuel): Should we be reporting an error to JavaScript or DCHECKing?
-  if (!guest_proxy_render_view)
-    return;
-
-  v8::HandleScope handle_scope(pending_response->isolate());
-  v8::Handle<v8::Function> callback = pending_response->GetCallback();
-  v8::Handle<v8::Context> context = callback->CreationContext();
-  if (context.IsEmpty())
-    return;
-
-  blink::WebFrame* frame = guest_proxy_render_view->GetWebView()->mainFrame();
-  v8::Local<v8::Value> window = frame->mainWorldScriptContext()->Global();
-
-  const int argc = 1;
-  v8::Handle<v8::Value> argv[argc] = { window };
-
-  v8::Context::Scope context_scope(context);
-  blink::WebScopedMicrotaskSuppression suppression;
-
-  // Call the AttachGuest API's callback with the guest proxy as the first
-  // parameter.
-  callback->Call(context->Global(), argc, argv);
-}
-
-// static
-bool GuestViewContainer::ShouldHandleMessage(const IPC::Message& message) {
-  switch (message.type()) {
-    case ExtensionMsg_CreateMimeHandlerViewGuestACK::ID:
-    case ExtensionMsg_GuestAttached::ID:
-      return true;
-    default:
-      break;
-  }
-  return false;
+  return OnMessage(message);
 }
 
 }  // namespace extensions