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/*
* Copyright (c) 2020, Itamar S. <itamar8910@gmail.com>
* Copyright (c) 2021-2022, the SerenityOS developers.
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/EnumBits.h>
#include <AK/Function.h>
#include <AK/Noncopyable.h>
#include <AK/NonnullRefPtr.h>
#include <AK/RefCounted.h>
#include <AK/String.h>
#include <Kernel/API/InodeWatcherEvent.h>
#include <Kernel/API/InodeWatcherFlags.h>
#include <LibCore/Notifier.h>
namespace Core {
struct FileWatcherEvent {
enum class Type {
Invalid = 0,
MetadataModified = 1 << 0,
ContentModified = 1 << 1,
Deleted = 1 << 2,
ChildCreated = 1 << 3,
ChildDeleted = 1 << 4,
};
Type type;
String event_path;
};
AK_ENUM_BITWISE_OPERATORS(FileWatcherEvent::Type);
class FileWatcherBase {
public:
virtual ~FileWatcherBase() = default;
ErrorOr<bool> add_watch(String path, FileWatcherEvent::Type event_mask);
ErrorOr<bool> remove_watch(String path);
bool is_watching(String const& path) const { return m_path_to_wd.find(path) != m_path_to_wd.end(); }
protected:
FileWatcherBase(int watcher_fd)
: m_watcher_fd(watcher_fd)
{
}
int m_watcher_fd { -1 };
HashMap<String, unsigned> m_path_to_wd;
HashMap<unsigned, String> m_wd_to_path;
};
class BlockingFileWatcher final : public FileWatcherBase {
AK_MAKE_NONCOPYABLE(BlockingFileWatcher);
public:
explicit BlockingFileWatcher(InodeWatcherFlags = InodeWatcherFlags::None);
~BlockingFileWatcher();
Optional<FileWatcherEvent> wait_for_event();
};
class FileWatcher final : public FileWatcherBase
, public RefCounted<FileWatcher> {
AK_MAKE_NONCOPYABLE(FileWatcher);
public:
static ErrorOr<NonnullRefPtr<FileWatcher>> create(InodeWatcherFlags = InodeWatcherFlags::None);
~FileWatcher();
Function<void(FileWatcherEvent const&)> on_change;
private:
FileWatcher(int watcher_fd, NonnullRefPtr<Notifier>);
NonnullRefPtr<Notifier> m_notifier;
};
}
namespace AK {
template<>
struct Formatter<Core::FileWatcherEvent> : Formatter<FormatString> {
ErrorOr<void> format(FormatBuilder& builder, Core::FileWatcherEvent const& value)
{
return Formatter<FormatString>::format(builder, "FileWatcherEvent(\"{}\", {})"sv, value.event_path, value.type);
}
};
template<>
struct Formatter<Core::FileWatcherEvent::Type> : Formatter<FormatString> {
ErrorOr<void> format(FormatBuilder& builder, Core::FileWatcherEvent::Type const& value)
{
StringView type;
switch (value) {
case Core::FileWatcherEvent::Type::ChildCreated:
type = "ChildCreated"sv;
break;
case Core::FileWatcherEvent::Type::ChildDeleted:
type = "ChildDeleted"sv;
break;
case Core::FileWatcherEvent::Type::Deleted:
type = "Deleted"sv;
break;
case Core::FileWatcherEvent::Type::ContentModified:
type = "ContentModified"sv;
break;
case Core::FileWatcherEvent::Type::MetadataModified:
type = "MetadataModified"sv;
break;
default:
VERIFY_NOT_REACHED();
}
return builder.put_string(type);
}
};
}
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