cef/libcef/browser/frame_service_base.h

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// Copyright 2017 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 CEF_LIBCEF_BROWSER_FRAME_SERVICE_BASE_H_
#define CEF_LIBCEF_BROWSER_FRAME_SERVICE_BASE_H_
#include <utility>
#include "base/bind.h"
#include "base/logging.h"
#include "base/threading/thread_checker.h"
#include "content/public/browser/navigation_handle.h"
#include "content/public/browser/render_frame_host.h"
#include "content/public/browser/web_contents.h"
#include "content/public/browser/web_contents_observer.h"
#include "mojo/public/cpp/bindings/pending_receiver.h"
#include "mojo/public/cpp/bindings/receiver.h"
#include "url/origin.h"
namespace content {
// Base class for mojo interface implementations tied to a document's lifetime.
// The service will be destroyed when any of the following happens:
// 1. mojo interface connection error happened,
// 2. the RenderFrameHost was deleted, or
// 3. navigation was committed on the RenderFrameHost (not same document) and
// ShouldCloseOnFinishNavigation() returns true.
//
// WARNING: To avoid race conditions, subclasses MUST only get the origin via
// origin() instead of from |render_frame_host| passed in the constructor.
// See https://crbug.com/769189 for an example of such a race.
//
// Based on the old implementation of DocumentServiceBase that existed prior to
// https://crrev.com/2809effa24. CEF requires the old implementation to support
// bindings that outlive navigation.
template <typename Interface>
class FrameServiceBase : public Interface, public WebContentsObserver {
public:
FrameServiceBase(RenderFrameHost* render_frame_host,
mojo::PendingReceiver<Interface> pending_receiver)
: WebContentsObserver(
WebContents::FromRenderFrameHost(render_frame_host)),
render_frame_host_(render_frame_host),
origin_(render_frame_host_->GetLastCommittedOrigin()),
receiver_(this, std::move(pending_receiver)) {
// |this| owns |receiver_|, so unretained is safe.
receiver_.set_disconnect_handler(
base::BindOnce(&FrameServiceBase::Close, base::Unretained(this)));
}
protected:
// Make the destructor private since |this| can only be deleted by Close().
virtual ~FrameServiceBase() = default;
// All subclasses should use this function to obtain the origin instead of
// trying to get it from the RenderFrameHost pointer directly.
const url::Origin& origin() const { return origin_; }
// Returns the RenderFrameHost held by this object.
RenderFrameHost* render_frame_host() const { return render_frame_host_; }
// Subclasses can use this to check thread safety.
// For example: DCHECK_CALLED_ON_VALID_THREAD(thread_checker_);
THREAD_CHECKER(thread_checker_);
private:
// Disallow calling web_contents() directly from the subclasses to ensure that
// tab-level state doesn't get queried or updated when the RenderFrameHost is
// not active.
// Use WebContents::From(render_frame_host()) instead, but please keep in mind
// that the render_frame_host() might not be active. See
// RenderFrameHost::IsActive() for details.
using WebContentsObserver::web_contents;
// WebContentsObserver implementation.
void RenderFrameDeleted(RenderFrameHost* render_frame_host) final {
DCHECK_CALLED_ON_VALID_THREAD(thread_checker_);
if (render_frame_host == render_frame_host_) {
DVLOG(1) << __func__ << ": RenderFrame destroyed.";
Close();
}
}
void DidFinishNavigation(NavigationHandle* navigation_handle) final {
DCHECK_CALLED_ON_VALID_THREAD(thread_checker_);
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if (!ShouldCloseOnFinishNavigation()) {
return;
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}
if (!navigation_handle->HasCommitted() ||
navigation_handle->IsSameDocument() ||
navigation_handle->IsPageActivation()) {
return;
}
if (navigation_handle->GetRenderFrameHost() == render_frame_host_) {
// FrameServiceBase is destroyed either when RenderFrameHost is
// destroyed (covered by RenderFrameDeleted) or when a new document
// commits in the same RenderFrameHost (covered by DidFinishNavigation).
// Only committed non-same-document non-bfcache non-prerendering
// activation navigations replace a document in existing RenderFrameHost.
DVLOG(1) << __func__ << ": Close connection on navigation.";
Close();
}
}
// Used for CEF bindings that outlive navigation.
virtual bool ShouldCloseOnFinishNavigation() const { return true; }
// Stops observing WebContents and delete |this|.
void Close() {
DCHECK_CALLED_ON_VALID_THREAD(thread_checker_);
DVLOG(1) << __func__;
delete this;
}
RenderFrameHost* const render_frame_host_ = nullptr;
const url::Origin origin_;
mojo::Receiver<Interface> receiver_;
};
} // namespace content
#endif // CEF_LIBCEF_BROWSER_FRAME_SERVICE_BASE_H_