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// Copyright 2023 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CONTENT_BROWSER_FILE_SYSTEM_ACCESS_FILE_SYSTEM_ACCESS_OBSERVER_OBSERVATION_H_
#define CONTENT_BROWSER_FILE_SYSTEM_ACCESS_FILE_SYSTEM_ACCESS_OBSERVER_OBSERVATION_H_
#include <memory>
#include <variant>
#include "base/sequence_checker.h"
#include "base/thread_annotations.h"
#include "content/browser/file_system_access/file_system_access_observation_group.h"
#include "content/browser/file_system_access/file_system_access_watcher_manager.h"
#include "content/public/browser/web_contents_observer.h"
#include "mojo/public/cpp/bindings/pending_remote.h"
#include "mojo/public/cpp/bindings/remote.h"
#include "storage/browser/file_system/file_system_url.h"
#include "third_party/blink/public/mojom/file_system_access/file_system_access_observer.mojom.h"
namespace content {
class FileSystemAccessDirectoryHandleImpl;
class FileSystemAccessFileHandleImpl;
class FileSystemAccessObserverHost;
// Browser-side representation of a successful `FileSystemObserver.observe()`
// call from JavaScript. Forwards changes to the observed file or directory
// to a mojo pipe whose receiver is owned by the renderer.
//
// TODO(crbug.com/341213353): Consider removing this class in favor of
// giving the ObserverHost a FileSystemAccessObserver mojo::RemoteSet. See
// https://chromium-review.googlesource.com/c/chromium/src/+/4809069/comment/8d90508d_74ae7891/.
class FileSystemAccessObserverObservation
: public WebContentsObserver,
public FileSystemAccessPermissionGrant::Observer {
public:
FileSystemAccessObserverObservation(
FileSystemAccessObserverHost* host,
std::unique_ptr<FileSystemAccessObservationGroup::Observer> observation,
mojo::PendingRemote<blink::mojom::FileSystemAccessObserver> remote,
std::variant<std::unique_ptr<FileSystemAccessDirectoryHandleImpl>,
std::unique_ptr<FileSystemAccessFileHandleImpl>> handle);
~FileSystemAccessObserverObservation() override;
FileSystemAccessObserverObservation(
FileSystemAccessObserverObservation const&) = delete;
FileSystemAccessObserverObservation& operator=(
FileSystemAccessObserverObservation const&) = delete;
const storage::FileSystemURL& handle_url() const;
// WebContentsObserver override.
void RenderFrameHostStateChanged(
RenderFrameHost* render_frame_host,
RenderFrameHost::LifecycleState old_state,
RenderFrameHost::LifecycleState new_state) override;
// FileSystemAccessPermissionGrant::Observer override.
void OnPermissionStatusChanged() override;
private:
void OnReceiverDisconnect();
// Called repeatedly by `observation_` whenever there are file changes. It
// processes the received change data and sends a file change event via mojo
// pipe.
void OnChanges(
const std::optional<std::list<FileSystemAccessObservationGroup::Change>>&
changes_or_error);
// Invoked if an error occurred while watching file changes. It sends a file
// change event with `kErrored` type and destroys this observation so that
// it is no longer observing. Currently, an error indicates that this
// observation is in a non-recoverable state.
void HandleError();
void RecordCallbackCountUMA();
SEQUENCE_CHECKER(sequence_checker_);
int callback_count_ = 0;
bool received_changes_while_in_bf_cache_ = false;
bool received_error_while_in_bf_cache_ = false;
// The host which owns this instance.
const raw_ptr<FileSystemAccessObserverHost> host_ = nullptr;
// The `FileSystemHandle` being observed.
const std::variant<std::unique_ptr<FileSystemAccessDirectoryHandleImpl>,
std::unique_ptr<FileSystemAccessFileHandleImpl>>
handle_;
std::unique_ptr<FileSystemAccessObservationGroup::Observer> observation_
GUARDED_BY_CONTEXT(sequence_checker_);
// Mojo pipes that send file change notifications back to the renderer.
// Each connection corresponds to a file system watch set up with
// `Observe()`.
mojo::Remote<blink::mojom::FileSystemAccessObserver> remote_
GUARDED_BY_CONTEXT(sequence_checker_);
base::WeakPtrFactory<FileSystemAccessObserverObservation> weak_factory_
GUARDED_BY_CONTEXT(sequence_checker_){this};
};
} // namespace content
#endif // CONTENT_BROWSER_FILE_SYSTEM_ACCESS_FILE_SYSTEM_ACCESS_OBSERVER_OBSERVATION_H_
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