tdlight/td/telegram/files/FileManager.h

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//
// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2020
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
#pragma once
#include "td/telegram/td_api.h"
#include "td/telegram/telegram_api.h"
#include "td/telegram/DialogId.h"
#include "td/telegram/files/FileDbId.h"
#include "td/telegram/files/FileEncryptionKey.h"
#include "td/telegram/files/FileGenerateManager.h"
#include "td/telegram/files/FileId.h"
#include "td/telegram/files/FileLoadManager.h"
#include "td/telegram/files/FileLocation.h"
#include "td/telegram/files/FileSourceId.h"
#include "td/telegram/files/FileStats.h"
#include "td/telegram/files/FileType.h"
#include "td/telegram/Location.h"
#include "td/telegram/PhotoSizeSource.h"
#include "td/actor/actor.h"
#include "td/actor/PromiseFuture.h"
#include "td/utils/buffer.h"
#include "td/utils/common.h"
#include "td/utils/Container.h"
#include "td/utils/Enumerator.h"
#include "td/utils/logging.h"
#include "td/utils/optional.h"
#include "td/utils/Slice.h"
#include "td/utils/Status.h"
#include "td/utils/StringBuilder.h"
#include <map>
#include <memory>
#include <set>
#include <unordered_map>
#include <unordered_set>
#include <utility>
#include <shared_mutex>
namespace td {
extern int VERBOSITY_NAME(update_file);
class FileData;
class FileDbInterface;
enum class FileLocationSource : int8 { None, FromUser, FromBinlog, FromDatabase, FromServer };
struct NewRemoteFileLocation {
NewRemoteFileLocation() = default;
NewRemoteFileLocation(RemoteFileLocation remote, FileLocationSource source);
RemoteFileLocation partial_or_empty() const;
unique_ptr<PartialRemoteFileLocation> partial;
//TODO: use RemoteId
// hardest part is to determine whether we should flush this location to db.
// probably, will need some generation in RemoteInfo
optional<FullRemoteFileLocation> full;
bool is_full_alive{false}; // if false, then we may try to upload this file
FileLocationSource full_source{FileLocationSource::None};
int64 ready_size = 0;
};
class FileNode {
public:
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FileNode() {empty = true;}
FileNode(LocalFileLocation local, NewRemoteFileLocation remote, unique_ptr<FullGenerateFileLocation> generate,
int64 size, int64 expected_size, string remote_name, string url, DialogId owner_dialog_id,
FileEncryptionKey key, FileId main_file_id, int8 main_file_id_priority)
: empty(false)
, local_(std::move(local))
, remote_(std::move(remote))
, generate_(std::move(generate))
, size_(size)
, expected_size_(expected_size)
, remote_name_(std::move(remote_name))
, url_(std::move(url))
, owner_dialog_id_(owner_dialog_id)
, encryption_key_(std::move(key))
, main_file_id_(main_file_id)
, main_file_id_priority_(main_file_id_priority) {
init_ready_size();
}
void drop_local_location();
void set_local_location(const LocalFileLocation &local, int64 ready_size, int64 prefix_offset,
int64 ready_prefix_size);
void set_new_remote_location(NewRemoteFileLocation remote);
void delete_partial_remote_location();
void set_partial_remote_location(const PartialRemoteFileLocation &remote, int64 ready_size);
bool delete_file_reference(Slice file_reference);
bool delete_file_reference_internal(Slice file_reference);
void set_generate_location(unique_ptr<FullGenerateFileLocation> &&generate);
void set_size(int64 size);
void set_expected_size(int64 expected_size);
void set_remote_name(string remote_name);
void set_url(string url);
void set_owner_dialog_id(DialogId owner_id);
void set_encryption_key(FileEncryptionKey key);
void set_upload_pause(FileId file_id);
void set_download_priority(int8 priority);
void set_upload_priority(int8 priority);
void set_generate_priority(int8 download_priority, int8 upload_priority);
void set_download_offset(int64 download_offset);
void set_download_limit(int64 download_limit);
void on_changed();
void on_info_changed();
void on_pmc_changed();
bool need_info_flush() const;
bool need_pmc_flush() const;
void on_pmc_flushed();
void on_info_flushed();
string suggested_name() const;
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bool empty = false;
private:
friend class FileView;
friend class FileManager;
static constexpr char PERSISTENT_ID_VERSION_OLD = 2;
static constexpr char PERSISTENT_ID_VERSION_MAP = 3;
static constexpr char PERSISTENT_ID_VERSION = 4;
LocalFileLocation local_;
FileLoadManager::QueryId upload_id_ = 0;
int64 download_offset_ = 0;
int64 download_limit_ = 0;
int64 local_ready_size_ = 0; // PartialLocal only
int64 local_ready_prefix_size_ = 0; // PartialLocal only
NewRemoteFileLocation remote_;
FileLoadManager::QueryId download_id_ = 0;
unique_ptr<FullGenerateFileLocation> generate_;
FileLoadManager::QueryId generate_id_ = 0;
int64 size_ = 0;
int64 expected_size_ = 0;
string remote_name_;
string url_;
DialogId owner_dialog_id_;
FileEncryptionKey encryption_key_;
FileDbId pmc_id_;
std::vector<FileId> file_ids_;
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FileId main_file_id_ = {};
double last_successful_force_reupload_time_ = -1e10;
FileId upload_pause_;
int8 upload_priority_ = 0;
int8 download_priority_ = 0;
int8 generate_priority_ = 0;
int8 generate_download_priority_ = 0;
int8 generate_upload_priority_ = 0;
int8 main_file_id_priority_ = 0;
bool is_download_offset_dirty_ = false;
bool is_download_limit_dirty_ = false;
bool get_by_hash_{false};
bool can_search_locally_{true};
bool need_reload_photo_{false};
bool is_download_started_ = false;
bool generate_was_update_ = false;
bool need_load_from_pmc_ = false;
bool pmc_changed_flag_{false};
bool info_changed_flag_{false};
bool upload_was_update_file_reference_{false};
bool download_was_update_file_reference_{false};
void init_ready_size();
void recalc_ready_prefix_size(int64 prefix_offset, int64 ready_prefix_size);
};
class FileManager;
class FileNodePtr {
public:
FileNodePtr() = default;
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FileNodePtr(FileManager *file_manager) : file_manager_(file_manager) {
}
FileNodePtr(FileId file_id, FileManager *file_manager) : file_id_(file_id), file_manager_(file_manager) {
}
FileNode *operator->() const;
FileNode &operator*() const;
FileNode *get() const;
FullRemoteFileLocation *get_remote() const;
explicit operator bool() const;
private:
FileId file_id_;
FileManager *file_manager_ = nullptr;
FileNode *get_unsafe() const;
};
class ConstFileNodePtr {
public:
ConstFileNodePtr() = default;
ConstFileNodePtr(FileNodePtr file_node_ptr) : file_node_ptr_(file_node_ptr) {
}
const FileNode *operator->() const {
return file_node_ptr_.operator->();
}
const FileNode &operator*() const {
return file_node_ptr_.operator*();
}
explicit operator bool() const {
return static_cast<bool>(file_node_ptr_);
}
const FullRemoteFileLocation *get_remote() const {
return file_node_ptr_.get_remote();
}
private:
FileNodePtr file_node_ptr_;
};
class FileView {
public:
FileView() = default;
explicit FileView(ConstFileNodePtr node);
bool empty() const;
bool has_local_location() const;
const FullLocalFileLocation &local_location() const;
bool has_remote_location() const;
bool has_alive_remote_location() const;
bool has_active_upload_remote_location() const;
bool has_active_download_remote_location() const;
const FullRemoteFileLocation &remote_location() const;
const FullRemoteFileLocation &main_remote_location() const;
bool has_generate_location() const;
const FullGenerateFileLocation &generate_location() const;
bool has_url() const;
const string &url() const;
const string &remote_name() const;
string suggested_name() const;
DialogId owner_dialog_id() const;
bool get_by_hash() const;
FileId file_id() const {
return node_->main_file_id_;
}
int64 size() const;
int64 expected_size(bool may_guess = false) const;
bool is_downloading() const;
int64 download_offset() const;
int64 downloaded_prefix(int64 offset) const;
int64 local_prefix_size() const;
int64 local_total_size() const;
bool is_uploading() const;
int64 remote_size() const;
string path() const;
int64 get_allocated_local_size() const;
bool can_download_from_server() const;
bool can_generate() const;
bool can_delete() const;
FileType get_type() const {
if (has_local_location()) {
return local_location().file_type_;
}
if (has_remote_location()) {
return remote_location().file_type_;
}
if (has_generate_location()) {
return generate_location().file_type_;
}
return FileType::Temp;
}
bool is_encrypted_secret() const {
return get_type() == FileType::Encrypted;
}
bool is_encrypted_secure() const {
return get_type() == FileType::Secure;
}
bool is_secure() const {
return get_type() == FileType::Secure || get_type() == FileType::SecureRaw;
}
bool is_encrypted_any() const {
return is_encrypted_secret() || is_encrypted_secure();
}
bool is_encrypted() const {
return is_encrypted_secret() || is_secure();
}
const FileEncryptionKey &encryption_key() const {
return node_->encryption_key_;
}
bool may_reload_photo() const {
if (!has_remote_location()) {
return false;
}
if (!remote_location().is_photo()) {
return false;
}
auto type = remote_location().get_source().get_type();
return type == PhotoSizeSource::Type::DialogPhotoBig || type == PhotoSizeSource::Type::DialogPhotoSmall ||
type == PhotoSizeSource::Type::StickerSetThumbnail;
}
string get_persistent_file_id() const;
string get_unique_file_id() const;
private:
ConstFileNodePtr node_{};
static string get_unique_id(const FullGenerateFileLocation &location);
static string get_unique_id(const FullRemoteFileLocation &location);
static string get_persistent_id(const FullGenerateFileLocation &location);
static string get_persistent_id(const FullRemoteFileLocation &location);
};
class FileManager : public FileLoadManager::Callback {
public:
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void memory_cleanup();
class DownloadCallback {
public:
DownloadCallback() = default;
DownloadCallback(const DownloadCallback &) = delete;
DownloadCallback &operator=(const DownloadCallback &) = delete;
virtual ~DownloadCallback() = default;
virtual void on_progress(FileId file_id) {
}
virtual void on_download_ok(FileId file_id) = 0;
virtual void on_download_error(FileId file_id, Status error) = 0;
};
class UploadCallback {
public:
UploadCallback() = default;
UploadCallback(const UploadCallback &) = delete;
UploadCallback &operator=(const UploadCallback &) = delete;
virtual ~UploadCallback() = default;
virtual void on_progress(FileId file_id) {
}
// After on_upload_ok all uploads of this file will be paused till merge, delete_partial_remote_location or
// explicit upload request with the same file_id.
// Also upload may be resumed after some other merges.
virtual void on_upload_ok(FileId file_id, tl_object_ptr<telegram_api::InputFile> input_file) = 0;
virtual void on_upload_encrypted_ok(FileId file_id, tl_object_ptr<telegram_api::InputEncryptedFile> input_file) = 0;
virtual void on_upload_secure_ok(FileId file_id, tl_object_ptr<telegram_api::InputSecureFile> input_file) = 0;
virtual void on_upload_error(FileId file_id, Status error) = 0;
};
class Context {
public:
virtual void on_new_file(int64 size, int64 real_size, int32 cnt) = 0;
virtual void on_file_updated(FileId size) = 0;
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virtual void destroy_file_source(FileId file_id) = 0;
virtual bool add_file_source(FileId file_id, FileSourceId file_source_id) = 0;
virtual bool remove_file_source(FileId file_id, FileSourceId file_source_id) = 0;
virtual void on_merge_files(FileId to_file_id, FileId from_file_id) = 0;
virtual vector<FileSourceId> get_some_file_sources(FileId file_id) = 0;
virtual void repair_file_reference(FileId file_id, Promise<Unit> promise) = 0;
virtual void reload_photo(PhotoSizeSource source, Promise<Unit> promise) = 0;
virtual ActorShared<> create_reference() = 0;
Context() = default;
Context(const Context &) = delete;
Context &operator=(const Context &) = delete;
virtual ~Context() = default;
};
explicit FileManager(unique_ptr<Context> context);
FileManager(const FileManager &other) = delete;
FileManager &operator=(const FileManager &other) = delete;
FileManager(FileManager &&other) = delete;
FileManager &operator=(FileManager &&other) = delete;
~FileManager() override;
static bool are_modification_times_equal(int64 old_mtime, int64 new_mtime);
void init_actor();
FileId dup_file_id(FileId file_id);
FileId dup_file_id_internal(FileId file_id);
void on_file_unlink(const FullLocalFileLocation &location);
FileId register_empty(FileType type);
Result<FileId> register_local(FullLocalFileLocation location, DialogId owner_dialog_id, int64 size,
bool get_by_hash = false, bool force = false,
bool skip_file_size_checks = false) TD_WARN_UNUSED_RESULT;
Result<FileId> register_local_internal(FullLocalFileLocation location, DialogId owner_dialog_id, int64 size,
bool get_by_hash = false, bool force = false,
bool skip_file_size_checks = false) TD_WARN_UNUSED_RESULT;
FileId register_remote(const FullRemoteFileLocation &location, FileLocationSource file_location_source,
DialogId owner_dialog_id, int64 size, int64 expected_size,
string remote_name) TD_WARN_UNUSED_RESULT;
FileId register_remote_internal(const FullRemoteFileLocation &location, FileLocationSource file_location_source,
DialogId owner_dialog_id, int64 size, int64 expected_size,
string remote_name) TD_WARN_UNUSED_RESULT;
Result<FileId> register_generate(FileType file_type, FileLocationSource file_location_source, string original_path,
string conversion, DialogId owner_dialog_id,
int64 expected_size) TD_WARN_UNUSED_RESULT;
Result<FileId> register_generate_internal(FileType file_type, FileLocationSource file_location_source, string original_path,
string conversion, DialogId owner_dialog_id,
int64 expected_size) TD_WARN_UNUSED_RESULT;
Result<FileId> merge(FileId x_file_id, FileId y_file_id, bool no_sync = false) TD_WARN_UNUSED_RESULT;
Result<FileId> merge_internal(FileId x_file_id, FileId y_file_id, bool no_sync = false) TD_WARN_UNUSED_RESULT;
void add_file_source(FileId file_id, FileSourceId file_source_id);
void add_file_source_internal(FileId file_id, FileSourceId file_source_id);
void remove_file_source(FileId file_id, FileSourceId file_source_id);
void change_files_source(FileSourceId file_source_id, const vector<FileId> &old_file_ids,
const vector<FileId> &new_file_ids);
void on_file_reference_repaired(FileId file_id, FileSourceId file_source_id, Result<Unit> &&result,
Promise<Unit> &&promise);
bool set_encryption_key(FileId file_id, FileEncryptionKey key);
bool set_content(FileId file_id, BufferSlice bytes);
void download(FileId file_id, std::shared_ptr<DownloadCallback> callback, int32 new_priority, int64 offset,
int64 limit);
void upload(FileId file_id, std::shared_ptr<UploadCallback> callback, int32 new_priority, uint64 upload_order);
void resume_upload(FileId file_id, std::vector<int> bad_parts, std::shared_ptr<UploadCallback> callback,
int32 new_priority, uint64 upload_order, bool force = false);
void cancel_upload(FileId file_id);
bool delete_partial_remote_location(FileId file_id);
void delete_file_reference(FileId file_id, std::string file_reference);
void delete_file_reference_internal(FileId file_id, std::string file_reference);
void get_content(FileId file_id, Promise<BufferSlice> promise);
void read_file_part(FileId file_id, int32 offset, int32 count, int left_tries,
Promise<td_api::object_ptr<td_api::filePart>> promise);
void delete_file(FileId file_id, Promise<Unit> promise, const char *source);
void external_file_generate_write_part(int64 id, int32 offset, string data, Promise<> promise);
void external_file_generate_progress(int64 id, int32 expected_size, int32 local_prefix_size, Promise<> promise);
void external_file_generate_finish(int64 id, Status status, Promise<> promise);
Result<FileId> from_persistent_id(CSlice persistent_id, FileType file_type) TD_WARN_UNUSED_RESULT;
FileView get_file_view(FileId file_id) const;
FileView get_sync_file_view(FileId file_id);
td_api::object_ptr<td_api::file> get_file_object(FileId file_id, bool with_main_file_id = true);
vector<int32> get_file_ids_object(const vector<FileId> &file_ids, bool with_main_file_id = true);
Result<FileId> get_input_thumbnail_file_id(const tl_object_ptr<td_api::InputFile> &thumb_input_file,
DialogId owner_dialog_id, bool is_encrypted) TD_WARN_UNUSED_RESULT;
Result<FileId> get_input_file_id(FileType type, const tl_object_ptr<td_api::InputFile> &file,
DialogId owner_dialog_id, bool allow_zero, bool is_encrypted,
bool get_by_hash = false, bool is_secure = false) TD_WARN_UNUSED_RESULT;
Result<FileId> get_map_thumbnail_file_id(Location location, int32 zoom, int32 width, int32 height, int32 scale,
DialogId owner_dialog_id) TD_WARN_UNUSED_RESULT;
vector<tl_object_ptr<telegram_api::InputDocument>> get_input_documents(const vector<FileId> &file_ids);
static bool extract_was_uploaded(const tl_object_ptr<telegram_api::InputMedia> &input_media);
static bool extract_was_thumbnail_uploaded(const tl_object_ptr<telegram_api::InputMedia> &input_media);
static string extract_file_reference(const tl_object_ptr<telegram_api::InputMedia> &input_media);
static string extract_file_reference(const tl_object_ptr<telegram_api::InputDocument> &input_document);
static string extract_file_reference(const tl_object_ptr<telegram_api::InputPhoto> &input_photo);
static bool extract_was_uploaded(const tl_object_ptr<telegram_api::InputChatPhoto> &input_chat_photo);
static string extract_file_reference(const tl_object_ptr<telegram_api::InputChatPhoto> &input_chat_photo);
template <class StorerT>
void store_file(FileId file_id, StorerT &storer, int32 ttl = 5) const;
template <class ParserT>
FileId parse_file(ParserT &parser);
private:
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void destroy_query(int32 file_id);
Result<FileId> check_input_file_id(FileType type, Result<FileId> result, bool is_encrypted, bool allow_zero,
bool is_secure) TD_WARN_UNUSED_RESULT;
FileId register_url(string url, FileType file_type, FileLocationSource file_location_source,
DialogId owner_dialog_id);
Result<FileId> register_file(FileData &&data, FileLocationSource file_location_source, const char *source, bool force,
bool skip_file_size_checks = false);
static constexpr int8 FROM_BYTES_PRIORITY = 10;
using FileNodeId = int32;
using QueryId = FileLoadManager::QueryId;
class Query {
public:
FileId file_id_;
enum class Type : int32 {
UploadByHash,
UploadWaitFileReference,
Upload,
DownloadWaitFileReference,
DownloadReloadDialog,
Download,
SetContent,
Generate
} type_;
};
friend StringBuilder &operator<<(StringBuilder &string_builder, Query::Type type);
struct FileIdInfo {
FileNodeId node_id_{0};
bool send_updates_flag_{false};
bool pin_flag_{false};
bool sent_file_id_flag_{false};
int8 download_priority_{0};
int8 upload_priority_{0};
uint64 upload_order_;
std::shared_ptr<DownloadCallback> download_callback_;
std::shared_ptr<UploadCallback> upload_callback_;
};
class ForceUploadActor;
ActorShared<> parent_;
unique_ptr<Context> context_;
std::shared_ptr<FileDbInterface> file_db_;
FileIdInfo *get_file_id_info(FileId file_id);
struct RemoteInfo {
// mutable is set to to enable changing of access hash
mutable FullRemoteFileLocation remote_;
mutable FileLocationSource file_location_source_;
FileId file_id_;
bool operator==(const RemoteInfo &other) const {
return this->remote_ == other.remote_;
}
bool operator<(const RemoteInfo &other) const {
return this->remote_ < other.remote_;
}
};
Enumerator<RemoteInfo> remote_location_info_;
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FileNodeId file_node_seqno = 1;
int32 file_id_seqno = 1;
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std::unordered_map<string, FileId> file_hash_to_file_id_;
std::map<FullLocalFileLocation, FileId> local_location_to_file_id_;
std::map<FullGenerateFileLocation, FileId> generate_location_to_file_id_;
std::map<FileDbId, int32> pmc_id_to_file_node_id_;
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std::unordered_map<int32, FileIdInfo> file_id_info_;
std::unordered_map<FileNodeId, unique_ptr<FileNode>> file_nodes_;
ActorOwn<FileLoadManager> file_load_manager_;
ActorOwn<FileGenerateManager> file_generate_manager_;
Container<Query> queries_container_;
bool is_closed_ = false;
std::set<std::string> bad_paths_;
FileId next_file_id();
FileNodeId next_file_node_id();
int32 next_pmc_file_id();
FileId create_file_id(int32 file_node_id, FileNode *file_node);
void try_forget_file_id(FileId file_id);
void load_from_pmc(FileId file_id, FullLocalFileLocation full_local);
void load_from_pmc(FileId file_id, const FullRemoteFileLocation &full_remote);
void load_from_pmc(FileId file_id, const FullGenerateFileLocation &full_generate);
template <class LocationT>
void load_from_pmc_impl(FileId file_id, const LocationT &location);
void load_from_pmc_result(FileId file_id, Result<FileData> &&result);
FileId register_pmc_file_data(FileData &&data);
Status check_local_location(FileNodePtr node);
bool try_fix_partial_local_location(FileNodePtr node);
Status check_local_location(FullLocalFileLocation &location, int64 &size, bool skip_file_size_checks);
void try_flush_node_full(FileNodePtr node, bool new_remote, bool new_local, bool new_generate, FileDbId other_pmc_id);
void try_flush_node(FileNodePtr node, const char *source);
void try_flush_node_info(FileNodePtr node, const char *source);
void try_flush_node_pmc(FileNodePtr node, const char *source);
void clear_from_pmc(FileNodePtr node);
void flush_to_pmc(FileNodePtr node, bool new_remote, bool new_local, bool new_generate, const char *source);
void load_from_pmc(FileNodePtr node, bool new_remote, bool new_local, bool new_generate);
Result<FileId> from_persistent_id_map(Slice binary, FileType file_type);
Result<FileId> from_persistent_id_v2(Slice binary, FileType file_type);
Result<FileId> from_persistent_id_v3(Slice binary, FileType file_type);
Result<FileId> from_persistent_id_v23(Slice binary, FileType file_type, int32 version);
string fix_file_extension(Slice file_name, Slice file_type, Slice file_extension);
string get_file_name(FileType file_type, Slice path);
ConstFileNodePtr get_file_node(FileId file_id) const {
return ConstFileNodePtr{FileNodePtr{file_id, const_cast<FileManager *>(this)}};
}
FileNodePtr get_file_node(FileId file_id) {
return FileNodePtr{file_id, this};
}
FileNode *get_file_node_raw(FileId file_id, FileNodeId *file_node_id = nullptr);
FileNodePtr get_sync_file_node(FileId file_id);
void on_force_reupload_success(FileId file_id);
// void release_file_node(FileNodeId id);
void do_cancel_download(FileNodePtr node);
void do_cancel_upload(FileNodePtr node);
void do_cancel_generate(FileNodePtr node);
void run_upload(FileNodePtr node, std::vector<int> bad_parts);
void run_download(FileNodePtr node);
void run_generate(FileNodePtr node);
void on_start_download(QueryId query_id) override;
void on_partial_download(QueryId query_id, const PartialLocalFileLocation &partial_local, int64 ready_size,
int64 size) override;
void on_hash(QueryId query_id, string hash) override;
void on_partial_upload(QueryId query_id, const PartialRemoteFileLocation &partial_remote, int64 ready_size) override;
void on_download_ok(QueryId query_id, const FullLocalFileLocation &local, int64 size, bool is_new) override;
void on_upload_ok(QueryId query_id, FileType file_type, const PartialRemoteFileLocation &partial_remote,
int64 size) override;
void on_upload_full_ok(QueryId query_id, const FullRemoteFileLocation &remote) override;
void on_error(QueryId query_id, Status status) override;
void on_error_impl(FileNodePtr node, Query::Type type, bool was_active, Status status);
void on_partial_generate(QueryId, const PartialLocalFileLocation &partial_local, int32 expected_size);
void on_generate_ok(QueryId, const FullLocalFileLocation &local);
std::pair<Query, bool> finish_query(QueryId query_id);
FullRemoteFileLocation *get_remote(int32 key);
std::unordered_set<FileId, FileIdHash> get_main_file_ids(const vector<FileId> &file_ids);
void hangup() override;
void tear_down() override;
mutable std::shared_timed_mutex memory_cleanup_mutex;
friend class FileNodePtr;
};
} // namespace td