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tdlib-fork/td/telegram/files/FileUploader.cpp
Arseny Smirnov e1046570a3 FileUploader: fix race with partial location deletion
GitOrigin-RevId: fa3cd8ca2cd5b376d557242a6b5f296dc09c90f4
2019-08-20 10:42:21 +03:00

348 lines
11 KiB
C++

//
// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2019
//
// 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)
//
#include "td/telegram/files/FileUploader.h"
#include "td/telegram/telegram_api.h"
#include "td/telegram/files/FileLoaderUtils.h"
#include "td/telegram/Global.h"
#include "td/telegram/net/DcId.h"
#include "td/telegram/net/NetQueryDispatcher.h"
#include "td/telegram/SecureStorage.h"
#include "td/utils/buffer.h"
#include "td/utils/common.h"
#include "td/utils/crypto.h"
#include "td/utils/format.h"
#include "td/utils/logging.h"
#include "td/utils/misc.h"
#include "td/utils/port/path.h"
#include "td/utils/Random.h"
#include "td/utils/ScopeGuard.h"
namespace td {
FileUploader::FileUploader(const LocalFileLocation &local, const RemoteFileLocation &remote, int64 expected_size,
const FileEncryptionKey &encryption_key, std::vector<int> bad_parts,
unique_ptr<Callback> callback)
: local_(local)
, remote_(remote)
, expected_size_(expected_size)
, encryption_key_(encryption_key)
, bad_parts_(std::move(bad_parts))
, callback_(std::move(callback)) {
if (encryption_key_.is_secret()) {
iv_ = encryption_key_.mutable_iv();
generate_iv_ = encryption_key_.iv_slice().str();
}
if (remote_.type() == RemoteFileLocation::Type::Partial && encryption_key_.is_secure()) {
remote_ = RemoteFileLocation{};
}
}
Result<FileLoader::FileInfo> FileUploader::init() {
if (remote_.type() == RemoteFileLocation::Type::Full) {
return Status::Error("File is already uploaded");
}
// file_size is needed only for partial local locations, but for uploaded partial files
// size is yet unknown or local location is full, so we can always pass 0 here
TRY_RESULT(prefix_info, on_update_local_location(local_, 0));
(void)prefix_info;
int offset = 0;
int part_size = 0;
if (remote_.type() == RemoteFileLocation::Type::Partial) {
const auto &partial = remote_.partial();
file_id_ = partial.file_id_;
part_size = partial.part_size_;
big_flag_ = partial.is_big_ != 0;
offset = partial.ready_part_count_;
} else {
file_id_ = Random::secure_int64();
big_flag_ = is_file_big(file_type_, expected_size_);
}
std::vector<bool> ok(offset, true);
for (auto bad_id : bad_parts_) {
if (bad_id >= 0 && bad_id < offset) {
ok[bad_id] = false;
}
}
std::vector<int> parts;
for (int i = 0; i < offset; i++) {
if (ok[i]) {
parts.push_back(i);
}
}
if (!ok.empty() && !ok[0]) {
parts.clear();
}
FileInfo res;
res.size = local_size_;
res.is_size_final = local_is_ready_;
res.part_size = part_size;
res.ready_parts = std::move(parts);
res.is_upload = true;
return res;
}
Result<FileLoader::PrefixInfo> FileUploader::on_update_local_location(const LocalFileLocation &location,
int64 file_size) {
SCOPE_EXIT {
try_release_fd();
};
if (encryption_key_.is_secure() && !fd_path_.empty()) {
return Status::Error("Can't change local location for Secure file");
}
string path;
int64 local_size = -1;
bool local_is_ready{false};
FileType file_type{FileType::Temp};
if (location.type() == LocalFileLocation::Type::Empty ||
(location.type() == LocalFileLocation::Type::Partial && encryption_key_.is_secure())) {
path = "";
local_size = 0;
local_is_ready = false;
file_type = FileType::Temp;
} else if (location.type() == LocalFileLocation::Type::Partial) {
path = location.partial().path_;
local_size = Bitmask(Bitmask::Decode{}, location.partial().ready_bitmask_)
.get_ready_prefix_size(0, location.partial().part_size_, file_size);
local_is_ready = false;
file_type = location.partial().file_type_;
} else {
path = location.full().path_;
if (path.empty()) {
return Status::Error("FullLocalFileLocation with empty path");
}
local_is_ready = true;
file_type = location.full().file_type_;
}
LOG(INFO) << "In FileUploader::on_update_local_location with " << location << ". Have path = \"" << path
<< "\", local_size = " << local_size << ", local_is_ready = " << local_is_ready
<< " and file type = " << file_type;
file_type_ = file_type;
bool is_temp = false;
if (encryption_key_.is_secure() && local_is_ready) {
TRY_RESULT(file_fd_path, open_temp_file(FileType::Temp));
file_fd_path.first.close();
auto new_path = std::move(file_fd_path.second);
TRY_RESULT(hash, secure_storage::encrypt_file(encryption_key_.secret(), path, new_path));
LOG(INFO) << "ENCRYPT " << path << " " << new_path;
callback_->on_hash(hash.as_slice().str());
path = new_path;
is_temp = true;
}
if (!path.empty() && (path != fd_path_ || fd_.empty())) {
auto res_fd = FileFd::open(path, FileFd::Read);
// Race: partial location could be already deleted. Just ignore such locations
if (res_fd.is_error()) {
if (location.type() == LocalFileLocation::Type::Partial) {
LOG(INFO) << "Ignore partial local location: " << res_fd.error();
PrefixInfo info;
info.size = local_size_;
info.is_ready = local_is_ready_;
return info;
}
return res_fd.move_as_error();
}
fd_.close();
fd_ = res_fd.move_as_ok();
fd_path_ = path;
is_temp_ = is_temp;
}
if (local_is_ready) {
CHECK(!fd_.empty());
TRY_RESULT(local_file_size, fd_.get_size());
local_size = local_file_size;
LOG(INFO) << "Set file local_size to " << local_size;
if (local_size == 0) {
return Status::Error("Can't upload empty file");
}
} else if (!fd_.empty()) {
TRY_RESULT(real_local_size, fd_.get_size());
if (real_local_size < local_size) {
LOG(ERROR) << tag("real_local_size", real_local_size) << " < " << tag("local_size", local_size);
PrefixInfo info;
info.size = local_size_;
info.is_ready = local_is_ready_;
return info;
}
}
local_size_ = local_size;
if (expected_size_ < local_size_) {
expected_size_ = local_size_;
}
local_is_ready_ = local_is_ready;
PrefixInfo info;
info.size = local_size_;
info.is_ready = local_is_ready_;
return info;
}
Status FileUploader::on_ok(int64 size) {
fd_.close();
if (is_temp_) {
LOG(INFO) << "UNLINK " << fd_path_;
unlink(fd_path_).ignore();
}
return Status::OK();
}
void FileUploader::on_error(Status status) {
fd_.close();
if (is_temp_) {
LOG(INFO) << "UNLINK " << fd_path_;
unlink(fd_path_).ignore();
}
callback_->on_error(std::move(status));
}
Status FileUploader::generate_iv_map() {
LOG(INFO) << "Generate iv_map " << generate_offset_ << " " << local_size_;
auto part_size = get_part_size();
auto encryption_key = FileEncryptionKey(encryption_key_.key_slice(), generate_iv_);
BufferSlice bytes(part_size);
if (iv_map_.empty()) {
iv_map_.push_back(encryption_key.mutable_iv());
}
CHECK(!fd_.empty());
for (; generate_offset_ + static_cast<int64>(part_size) < local_size_;
generate_offset_ += static_cast<int64>(part_size)) {
TRY_RESULT(read_size, fd_.pread(bytes.as_slice(), generate_offset_));
if (read_size != part_size) {
return Status::Error("Failed to read file part (for iv_map)");
}
aes_ige_encrypt(as_slice(encryption_key.key()), as_slice(encryption_key.mutable_iv()), bytes.as_slice(),
bytes.as_slice());
iv_map_.push_back(encryption_key.mutable_iv());
}
generate_iv_ = encryption_key.iv_slice().str();
return Status::OK();
}
Status FileUploader::before_start_parts() {
auto status = acquire_fd();
if (status.is_error() && !local_is_ready_) {
return Status::Error(1, "Can't open temporary file");
}
return status;
}
void FileUploader::after_start_parts() {
try_release_fd();
}
Result<std::pair<NetQueryPtr, bool>> FileUploader::start_part(Part part, int32 part_count) {
auto padded_size = part.size;
if (encryption_key_.is_secret()) {
padded_size = (padded_size + 15) & ~15;
}
BufferSlice bytes(padded_size);
TRY_RESULT(size, fd_.pread(bytes.as_slice().truncate(part.size), part.offset));
if (encryption_key_.is_secret()) {
Random::secure_bytes(bytes.as_slice().substr(part.size));
if (next_offset_ == part.offset) {
aes_ige_encrypt(as_slice(encryption_key_.key()), as_slice(iv_), bytes.as_slice(), bytes.as_slice());
next_offset_ += static_cast<int64>(bytes.size());
} else {
if (part.id >= static_cast<int32>(iv_map_.size())) {
TRY_STATUS(generate_iv_map());
}
CHECK(part.id < static_cast<int32>(iv_map_.size()) && part.id >= 0);
auto iv = iv_map_[part.id];
aes_ige_encrypt(as_slice(encryption_key_.key()), as_slice(iv), bytes.as_slice(), bytes.as_slice());
}
}
if (size != part.size) {
return Status::Error("Failed to read file part");
}
NetQueryPtr net_query;
if (big_flag_) {
auto query =
telegram_api::upload_saveBigFilePart(file_id_, part.id, local_is_ready_ ? part_count : -1, std::move(bytes));
net_query = G()->net_query_creator().create(create_storer(query), DcId::main(), NetQuery::Type::Upload,
NetQuery::AuthFlag::On, NetQuery::GzipFlag::Off);
} else {
auto query = telegram_api::upload_saveFilePart(file_id_, part.id, std::move(bytes));
net_query = G()->net_query_creator().create(create_storer(query), DcId::main(), NetQuery::Type::Upload,
NetQuery::AuthFlag::On, NetQuery::GzipFlag::Off);
}
net_query->file_type_ = narrow_cast<int32>(file_type_);
return std::make_pair(std::move(net_query), false);
}
Result<size_t> FileUploader::process_part(Part part, NetQueryPtr net_query) {
if (net_query->is_error()) {
return std::move(net_query->error());
}
Result<bool> result = [&] {
if (big_flag_) {
return fetch_result<telegram_api::upload_saveBigFilePart>(net_query->ok());
} else {
return fetch_result<telegram_api::upload_saveFilePart>(net_query->ok());
}
}();
if (result.is_error()) {
return result.move_as_error();
}
if (!result.ok()) {
// TODO: it is possible
return Status::Error(500, "Internal Server Error");
}
return part.size;
}
void FileUploader::on_progress(Progress progress) {
callback_->on_partial_upload(PartialRemoteFileLocation{file_id_, progress.part_count, progress.part_size,
progress.ready_part_count, big_flag_},
progress.ready_size);
if (progress.is_ready) {
callback_->on_ok(file_type_,
PartialRemoteFileLocation{file_id_, progress.part_count, progress.part_size,
progress.ready_part_count, big_flag_},
local_size_);
}
}
FileLoader::Callback *FileUploader::get_callback() {
return static_cast<FileLoader::Callback *>(callback_.get());
}
void FileUploader::keep_fd_flag(bool keep_fd) {
keep_fd_ = keep_fd;
try_release_fd();
}
void FileUploader::try_release_fd() {
if (!keep_fd_ && !fd_.empty()) {
fd_.close();
}
}
Status FileUploader::acquire_fd() {
if (fd_.empty()) {
TRY_RESULT(fd, FileFd::open(fd_path_, FileFd::Read));
fd_ = std::move(fd);
}
return Status::OK();
}
} // namespace td