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// Copyright 2014 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "components/guest_view/renderer/guest_view_container.h"
#include <memory>
#include "base/containers/contains.h"
#include "base/functional/bind.h"
#include "base/memory/raw_ptr.h"
#include "base/no_destructor.h"
#include "components/guest_view/common/guest_view_constants.h"
#include "components/guest_view/renderer/guest_view_request.h"
#include "content/public/renderer/render_frame_observer.h"
#include "v8/include/v8-context.h"
#include "v8/include/v8-function.h"
#include "v8/include/v8-microtask-queue.h"
#include "v8/include/v8-primitive.h"
namespace {
using GuestViewContainerMap = std::map<int, guest_view::GuestViewContainer*>;
GuestViewContainerMap& GetContainerMap() {
static base::NoDestructor<GuestViewContainerMap> instance;
return *instance;
}
} // namespace
namespace guest_view {
class GuestViewContainer::RenderFrameLifetimeObserver
: public content::RenderFrameObserver {
public:
RenderFrameLifetimeObserver(GuestViewContainer* container,
content::RenderFrame* render_frame);
~RenderFrameLifetimeObserver() override = default;
RenderFrameLifetimeObserver(const RenderFrameLifetimeObserver&) = delete;
RenderFrameLifetimeObserver& operator=(const RenderFrameLifetimeObserver&) =
delete;
// content::RenderFrameObserver overrides.
void OnDestruct() override;
private:
const raw_ptr<GuestViewContainer> container_;
};
GuestViewContainer::RenderFrameLifetimeObserver::RenderFrameLifetimeObserver(
GuestViewContainer* container,
content::RenderFrame* render_frame)
: content::RenderFrameObserver(render_frame),
container_(container) {}
void GuestViewContainer::RenderFrameLifetimeObserver::OnDestruct() {
container_->RenderFrameDestroyed();
}
GuestViewContainer::GuestViewContainer(content::RenderFrame* render_frame,
int element_instance_id)
: element_instance_id_(element_instance_id),
render_frame_lifetime_observer_(
std::make_unique<RenderFrameLifetimeObserver>(this, render_frame)) {
DCHECK(!base::Contains(GetContainerMap(), element_instance_id));
GetContainerMap().insert(std::make_pair(element_instance_id, this));
}
GuestViewContainer::~GuestViewContainer() {
// Note: Cleanups should be done in GuestViewContainer::Destroy(), not here.
DCHECK(in_destruction_);
}
// static.
GuestViewContainer* GuestViewContainer::FromID(int element_instance_id) {
GuestViewContainerMap& guest_view_containers = GetContainerMap();
auto it = guest_view_containers.find(element_instance_id);
return it == guest_view_containers.end() ? nullptr : it->second;
}
// Right now a GuestViewContainer can be destroyed in one of the following
// ways:
//
// 1. If GuestViewContainer is driven by content/, the element (browser plugin)
// can destroy GuestViewContainer when the element is destroyed.
// 2. If GuestViewContainer is managed outside of content/, then the
// <webview> element's GC will destroy it.
// 3. If GuestViewContainer's embedder frame is destroyed, we'd also destroy
// GuestViewContainer.
void GuestViewContainer::Destroy(bool embedder_frame_destroyed) {
if (in_destruction_)
return;
in_destruction_ = true;
RunDestructionCallback(embedder_frame_destroyed);
// Invalidate weak references to us to avoid late arriving tasks from running
// during destruction
weak_ptr_factory_.InvalidateWeakPtrs();
DCHECK_NE(element_instance_id(), guest_view::kInstanceIDNone);
GetContainerMap().erase(element_instance_id());
if (!embedder_frame_destroyed) {
if (pending_response_)
pending_response_->ExecuteCallbackIfAvailable(0 /* argc */, nullptr);
while (pending_requests_.size() > 0) {
std::unique_ptr<GuestViewAttachRequest> pending_request =
std::move(pending_requests_.front());
pending_requests_.pop_front();
// Call the JavaScript callbacks with no arguments which implies an error.
pending_request->ExecuteCallbackIfAvailable(0 /* argc */, nullptr);
}
}
delete this;
}
void GuestViewContainer::RegisterDestructionCallback(
v8::Local<v8::Function> callback,
v8::Isolate* isolate) {
destruction_callback_.Reset(isolate, callback);
destruction_isolate_ = isolate;
}
void GuestViewContainer::RenderFrameDestroyed() {
Destroy(true /* embedder_frame_destroyed */);
}
void GuestViewContainer::IssueRequest(
std::unique_ptr<GuestViewAttachRequest> request) {
EnqueueRequest(std::move(request));
PerformPendingRequest();
}
void GuestViewContainer::EnqueueRequest(
std::unique_ptr<GuestViewAttachRequest> request) {
pending_requests_.push_back(std::move(request));
}
void GuestViewContainer::PerformPendingRequest() {
if (pending_requests_.empty() || pending_response_.get())
return;
std::unique_ptr<GuestViewAttachRequest> pending_request =
std::move(pending_requests_.front());
pending_requests_.pop_front();
pending_request->PerformRequest();
pending_response_ = std::move(pending_request);
}
void GuestViewContainer::RunDestructionCallback(bool embedder_frame_destroyed) {
// Do not attempt to run |destruction_callback_| if the embedder frame was
// destroyed. Trying to invoke callback on RenderFrame destruction results in
// assertion failure when calling v8::MicrotasksScope.
if (embedder_frame_destroyed)
return;
// Call the destruction callback, if one is registered.
if (!destruction_callback_.IsEmpty()) {
v8::HandleScope handle_scope(destruction_isolate_);
v8::Local<v8::Function> callback = v8::Local<v8::Function>::New(
destruction_isolate_, destruction_callback_);
v8::Local<v8::Context> context;
if (!callback->GetCreationContext(destruction_isolate_).ToLocal(&context)) {
return;
}
v8::Context::Scope context_scope(context);
v8::MicrotasksScope microtasks(destruction_isolate_,
context->GetMicrotaskQueue(),
v8::MicrotasksScope::kDoNotRunMicrotasks);
callback->Call(context, context->Global(), 0 /* argc */, nullptr)
.FromMaybe(v8::Local<v8::Value>());
}
}
void GuestViewContainer::OnRequestAcknowledged(
GuestViewAttachRequest* request) {
base::WeakPtr<GuestViewContainer> weak_ptr(weak_ptr_factory_.GetWeakPtr());
// Handle the callback for the current request with a pending response.
CHECK(pending_response_);
DCHECK_EQ(pending_response_.get(), request);
std::unique_ptr<GuestViewAttachRequest> pending_response =
std::move(pending_response_);
pending_response->ExecuteCallbackIfAvailable(0, nullptr);
// Check that this container has not been deleted (crbug.com/718292).
if (!weak_ptr)
return;
// Perform the subsequent request if one exists.
PerformPendingRequest();
}
} // namespace guest_view
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