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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 "base/sequence_checker.h"
#include "base/thread_annotations.h"
#include "content/browser/file_system_access/file_system_access_watcher_manager.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/abseil-cpp/absl/types/variant.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(https://crbug.com/1019297): 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:
FileSystemAccessObserverObservation(
FileSystemAccessObserverHost* host,
std::unique_ptr<FileSystemAccessWatcherManager::Observation> observation,
mojo::PendingRemote<blink::mojom::FileSystemAccessObserver> remote,
absl::variant<std::unique_ptr<FileSystemAccessDirectoryHandleImpl>,
std::unique_ptr<FileSystemAccessFileHandleImpl>> handle);
~FileSystemAccessObserverObservation();
FileSystemAccessObserverObservation(
FileSystemAccessObserverObservation const&) = delete;
FileSystemAccessObserverObservation& operator=(
FileSystemAccessObserverObservation const&) = delete;
const storage::FileSystemURL& handle_url() const;
private:
void OnReceiverDisconnect();
// Called repeatedly by `observation_`.
void OnChanges(
const std::list<FileSystemAccessWatcherManager::Observation::Change>&
changes);
SEQUENCE_CHECKER(sequence_checker_);
// The host which owns this instance.
const raw_ptr<FileSystemAccessObserverHost> host_;
// The `FileSystemHandle` being observed.
const absl::variant<std::unique_ptr<FileSystemAccessDirectoryHandleImpl>,
std::unique_ptr<FileSystemAccessFileHandleImpl>>
handle_;
std::unique_ptr<FileSystemAccessWatcherManager::Observation> 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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