tdlight/td/telegram/files/FileDownloader.h

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//
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// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2021
//
// 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/telegram_api.h"
#include "td/telegram/files/FileEncryptionKey.h"
#include "td/telegram/files/FileLoader.h"
#include "td/telegram/files/FileLocation.h"
#include "td/telegram/net/DcId.h"
#include "td/telegram/net/NetQuery.h"
#include "td/utils/common.h"
#include "td/utils/port/FileFd.h"
#include "td/utils/Status.h"
#include <map>
#include <set>
#include <utility>
namespace td {
class FileDownloader final : public FileLoader {
public:
class Callback : public FileLoader::Callback {
public:
virtual void on_start_download() = 0;
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virtual void on_partial_download(PartialLocalFileLocation partial_local, int64 ready_size, int64 size) = 0;
virtual void on_ok(FullLocalFileLocation full_local, int64 size, bool is_new) = 0;
virtual void on_error(Status status) = 0;
};
FileDownloader(const FullRemoteFileLocation &remote, const LocalFileLocation &local, int64 size, string name,
const FileEncryptionKey &encryption_key, bool is_small, bool search_file, int64 offset, int64 limit,
unique_ptr<Callback> callback);
// Should just implement all parent pure virtual methods.
// Must not call any of them...
private:
enum class QueryType : uint8 { Default = 1, CDN, ReuploadCDN };
ResourceState resource_state_;
FullRemoteFileLocation remote_;
LocalFileLocation local_;
int64 size_;
string name_;
FileEncryptionKey encryption_key_;
unique_ptr<Callback> callback_;
bool only_check_{false};
string path_;
FileFd fd_;
int32 next_part_ = 0;
bool next_part_stop_ = false;
bool is_small_;
bool search_file_{false};
int64 offset_;
int64 limit_;
bool use_cdn_ = false;
DcId cdn_dc_id_;
string cdn_encryption_key_;
string cdn_encryption_iv_;
string cdn_file_token_;
int32 cdn_file_token_generation_{0};
std::map<int32, string> cdn_part_reupload_token_;
std::map<int32, int32> cdn_part_file_token_generation_;
bool need_check_{false};
struct HashInfo {
int64 offset;
size_t size;
string hash;
bool operator<(const HashInfo &other) const {
return offset < other.offset;
}
};
std::set<HashInfo> hash_info_;
bool has_hash_query_ = false;
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Result<FileInfo> init() final TD_WARN_UNUSED_RESULT;
Status on_ok(int64 size) final TD_WARN_UNUSED_RESULT;
void on_error(Status status) final;
Result<bool> should_restart_part(Part part, NetQueryPtr &net_query) final TD_WARN_UNUSED_RESULT;
Result<std::pair<NetQueryPtr, bool>> start_part(Part part, int32 part_count,
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int64 streaming_offset) final TD_WARN_UNUSED_RESULT;
Result<size_t> process_part(Part part, NetQueryPtr net_query) final TD_WARN_UNUSED_RESULT;
void on_progress(Progress progress) final;
FileLoader::Callback *get_callback() final;
Status process_check_query(NetQueryPtr net_query) final;
Result<CheckInfo> check_loop(int64 checked_prefix_size, int64 ready_prefix_size, bool is_ready) final;
void add_hash_info(const std::vector<telegram_api::object_ptr<telegram_api::fileHash>> &hashes);
bool keep_fd_ = false;
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void keep_fd_flag(bool keep_fd) final;
void try_release_fd();
Status acquire_fd() TD_WARN_UNUSED_RESULT;
Status check_net_query(NetQueryPtr &net_query);
};
} // namespace td