tdlight/tddb/td/db/binlog/Binlog.cpp

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//
// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2018
//
// 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/db/binlog/Binlog.h"
#include "td/db/binlog/detail/BinlogEventsBuffer.h"
#include "td/db/binlog/detail/BinlogEventsProcessor.h"
#include "td/utils/buffer.h"
#include "td/utils/format.h"
#include "td/utils/logging.h"
#include "td/utils/misc.h"
#include "td/utils/port/Clocks.h"
#include "td/utils/port/Fd.h"
#include "td/utils/port/path.h"
#include "td/utils/port/Stat.h"
#include "td/utils/Random.h"
#include "td/utils/ScopeGuard.h"
#include "td/utils/Status.h"
#include "td/utils/Time.h"
#include "td/utils/tl_helpers.h"
#include "td/utils/tl_parsers.h"
namespace td {
namespace detail {
struct AesCtrEncryptionEvent {
static constexpr size_t min_salt_size() {
return 16; // 256 bits
}
static constexpr size_t default_salt_size() {
return 32; // 256 bits
}
static constexpr size_t key_size() {
return 32; // 256 bits
}
static constexpr size_t iv_size() {
return 16; // 128 bits
}
static constexpr size_t hash_size() {
return 32; // 256 bits
}
static constexpr size_t kdf_iteration_count() {
return 60002;
}
static constexpr size_t kdf_fast_iteration_count() {
return 2;
}
BufferSlice key_salt_;
BufferSlice iv_;
BufferSlice key_hash_;
BufferSlice generate_key(const DbKey &db_key) {
CHECK(!db_key.is_empty());
BufferSlice key(key_size());
size_t iteration_count = kdf_iteration_count();
if (db_key.is_raw_key()) {
iteration_count = kdf_fast_iteration_count();
}
pbkdf2_sha256(db_key.data(), key_salt_.as_slice(), narrow_cast<int>(iteration_count), key.as_slice());
return key;
}
BufferSlice generate_hash(Slice key) {
BufferSlice hash(hash_size());
hmac_sha256(key, "cucumbers everywhere", hash.as_slice());
return hash;
}
template <class StorerT>
void store(StorerT &storer) const {
using td::store;
BEGIN_STORE_FLAGS();
END_STORE_FLAGS();
store(key_salt_, storer);
store(iv_, storer);
store(key_hash_, storer);
}
template <class ParserT>
void parse(ParserT &&parser) {
using td::parse;
BEGIN_PARSE_FLAGS();
END_PARSE_FLAGS_GENERIC();
parse(key_salt_, parser);
parse(iv_, parser);
parse(key_hash_, parser);
}
};
class BinlogReader {
public:
BinlogReader() = default;
explicit BinlogReader(ChainBufferReader *input) : input_(input) {
}
void set_input(ChainBufferReader *input) {
input_ = input;
}
int64 offset() {
return offset_;
}
Result<size_t> read_next(BinlogEvent *event) {
if (state_ == ReadLength) {
if (input_->size() < 4) {
return 4;
}
auto it = input_->clone();
char buf[4];
it.advance(4, MutableSlice(buf, 4));
size_ = static_cast<size_t>(TlParser(Slice(buf, 4)).fetch_int());
if (size_ > MAX_EVENT_SIZE) {
return Status::Error(PSLICE() << "Too big event " << tag("size", size_));
}
if (size_ < MIN_EVENT_SIZE) {
return Status::Error(PSLICE() << "Too small event " << tag("size", size_));
}
state_ = ReadEvent;
}
if (input_->size() < size_) {
return size_;
}
TRY_STATUS(event->init(input_->cut_head(size_).move_as_buffer_slice()));
offset_ += size_;
event->offset_ = offset_;
state_ = ReadLength;
return 0;
}
private:
ChainBufferReader *input_;
enum { ReadLength, ReadEvent } state_ = ReadLength;
size_t size_{0};
int64 offset_{0};
};
} // namespace detail
bool Binlog::IGNORE_ERASE_HACK = false;
Binlog::Binlog() = default;
Binlog::~Binlog() {
close().ignore();
}
Result<FileFd> Binlog::open_binlog(CSlice path, int32 flags) {
TRY_RESULT(fd, FileFd::open(path, flags));
TRY_STATUS(fd.lock(FileFd::LockFlags::Write, 100));
return std::move(fd);
}
Status Binlog::init(string path, const Callback &callback, DbKey db_key, DbKey old_db_key, int32 dummy,
const Callback &debug_callback) {
close().ignore();
db_key_ = std::move(db_key);
old_db_key_ = std::move(old_db_key);
processor_ = std::make_unique<detail::BinlogEventsProcessor>();
// Turn off BinlogEventsBuffer
// events_buffer_ = std::make_unique<detail::BinlogEventsBuffer>();
// try to restore binlog from regenerated version
if (stat(path).is_error()) {
rename(PSLICE() << path << ".new", path).ignore();
}
info_ = BinlogInfo();
info_.was_created = stat(path).is_error();
TRY_RESULT(fd, open_binlog(path, FileFd::Flags::Read | FileFd::Flags::Write | FileFd::Flags::Create));
fd_ = BufferedFdBase<FileFd>(std::move(fd));
fd_size_ = 0;
path_ = std::move(path);
auto status = load_binlog(callback, debug_callback);
if (status.is_error()) {
close().ignore();
return status;
}
info_.last_id = processor_->last_id();
last_id_ = processor_->last_id();
if (info_.wrong_password) {
close().ignore();
return Status::Error(Error::WrongPassword, "Wrong password");
}
if ((!db_key_.is_empty() && !db_key_used_) || (db_key_.is_empty() && encryption_type_ != EncryptionType::None)) {
aes_ctr_key_salt_ = BufferSlice();
do_reindex();
}
info_.is_opened = true;
return Status::OK();
}
void Binlog::add_event(BinlogEvent &&event) {
if (!events_buffer_) {
do_add_event(std::move(event));
} else {
events_buffer_->add_event(std::move(event));
}
lazy_flush();
if (state_ == State::Run) {
auto fd_size = fd_size_;
if (events_buffer_) {
fd_size += events_buffer_->size();
}
auto need_reindex = [&](int64 min_size, int rate) {
return fd_size > min_size && fd_size / rate > processor_->total_raw_events_size();
};
if (need_reindex(100000, 5) || need_reindex(500000, 2)) {
LOG(INFO) << tag("fd_size", format::as_size(fd_size))
<< tag("total events size", format::as_size(processor_->total_raw_events_size()));
do_reindex();
}
}
}
size_t Binlog::flush_events_buffer(bool force) {
if (!events_buffer_) {
return 0;
}
if (!force && !events_buffer_->need_flush()) {
return events_buffer_->size();
}
CHECK(!in_flush_events_buffer_);
in_flush_events_buffer_ = true;
events_buffer_->flush([&](BinlogEvent &&event) { this->do_add_event(std::move(event)); });
in_flush_events_buffer_ = false;
return 0;
}
void Binlog::do_add_event(BinlogEvent &&event) {
if (event.flags_ & BinlogEvent::Flags::Partial) {
event.flags_ &= ~BinlogEvent::Flags::Partial;
pending_events_.emplace_back(std::move(event));
} else {
for (auto &pending_event : pending_events_) {
do_event(std::move(pending_event));
}
pending_events_.clear();
do_event(std::move(event));
}
}
Status Binlog::close(bool need_sync) {
if (fd_.empty()) {
return Status::OK();
}
SCOPE_EXIT {
path_ = "";
info_.is_opened = false;
fd_.close();
need_sync_ = false;
};
if (need_sync) {
sync();
} else {
flush();
}
return Status::OK();
}
void Binlog::change_key(DbKey new_db_key) {
db_key_ = std::move(new_db_key);
aes_ctr_key_salt_ = BufferSlice();
do_reindex();
}
Status Binlog::close_and_destroy() {
auto path = path_;
auto close_status = close(false);
destroy(path).ignore();
return close_status;
}
Status Binlog::destroy(Slice path) {
unlink(PSLICE() << path).ignore();
unlink(PSLICE() << path << ".new").ignore();
return Status::OK();
}
void Binlog::do_event(BinlogEvent &&event) {
fd_events_++;
fd_size_ += event.raw_event_.size();
if (state_ == State::Run || state_ == State::Reindex) {
VLOG(binlog) << "Write binlog event: " << format::cond(state_ == State::Reindex, "[reindex] ") << event;
switch (encryption_type_) {
case EncryptionType::None: {
buffer_writer_.append(event.raw_event_.clone());
break;
}
case EncryptionType::AesCtr: {
buffer_writer_.append(event.raw_event_.as_slice());
break;
}
}
}
if (event.type_ < 0) {
if (event.type_ == BinlogEvent::ServiceTypes::AesCtrEncryption) {
detail::AesCtrEncryptionEvent encryption_event;
encryption_event.parse(TlParser(event.data_));
BufferSlice key;
if (aes_ctr_key_salt_.as_slice() == encryption_event.key_salt_.as_slice()) {
key = BufferSlice(Slice(aes_ctr_key_.raw, sizeof(aes_ctr_key_.raw)));
} else if (!db_key_.is_empty()) {
key = encryption_event.generate_key(db_key_);
}
if (encryption_event.generate_hash(key.as_slice()).as_slice() != encryption_event.key_hash_.as_slice()) {
CHECK(state_ == State::Load);
if (!old_db_key_.is_empty()) {
key = encryption_event.generate_key(old_db_key_);
if (encryption_event.generate_hash(key.as_slice()).as_slice() != encryption_event.key_hash_.as_slice()) {
info_.wrong_password = true;
}
} else {
info_.wrong_password = true;
}
} else {
db_key_used_ = true;
}
encryption_type_ = EncryptionType::AesCtr;
aes_ctr_key_salt_ = encryption_event.key_salt_.copy();
update_encryption(key.as_slice(), encryption_event.iv_.as_slice());
if (state_ == State::Load) {
update_read_encryption();
LOG(INFO) << "Load: init encryption";
} else {
CHECK(state_ == State::Reindex);
flush();
update_write_encryption();
//LOG(INFO) << format::cond(state_ == State::Run, "Run", "Reindex") << ": init encryption";
}
}
}
if (state_ != State::Reindex) {
processor_->add_event(std::move(event));
}
}
void Binlog::sync() {
flush();
if (need_sync_) {
auto status = fd_.sync();
LOG_IF(FATAL, status.is_error()) << "Failed to sync binlog: " << status;
need_sync_ = false;
}
}
void Binlog::flush() {
if (state_ == State::Load) {
return;
}
flush_events_buffer(true);
// NB: encryption happens during flush
if (byte_flow_flag_) {
byte_flow_source_.wakeup();
}
auto r_written = fd_.flush_write();
r_written.ensure();
auto written = r_written.ok();
if (written > 0) {
need_sync_ = true;
}
need_flush_since_ = 0;
LOG_IF(FATAL, fd_.need_flush_write()) << "Failed to flush binlog";
}
void Binlog::lazy_flush() {
size_t events_buffer_size = flush_events_buffer(false /*force*/);
buffer_reader_.sync_with_writer();
auto size = buffer_reader_.size() + events_buffer_size;
if (size > (1 << 14)) {
flush();
} else if (size > 0 && need_flush_since_ == 0) {
need_flush_since_ = Time::now_cached();
}
}
void Binlog::update_read_encryption() {
CHECK(binlog_reader_ptr_);
switch (encryption_type_) {
case EncryptionType::None: {
binlog_reader_ptr_->set_input(&buffer_reader_);
byte_flow_flag_ = false;
break;
}
case EncryptionType::AesCtr: {
byte_flow_source_ = ByteFlowSource(&buffer_reader_);
aes_xcode_byte_flow_ = AesCtrByteFlow();
aes_xcode_byte_flow_.init(std::move(aes_ctr_state_));
byte_flow_sink_ = ByteFlowSink();
byte_flow_source_ >> aes_xcode_byte_flow_ >> byte_flow_sink_;
byte_flow_flag_ = true;
binlog_reader_ptr_->set_input(byte_flow_sink_.get_output());
break;
}
}
}
void Binlog::update_write_encryption() {
switch (encryption_type_) {
case EncryptionType::None: {
fd_.set_output_reader(&buffer_reader_);
byte_flow_flag_ = false;
break;
}
case EncryptionType::AesCtr: {
byte_flow_source_ = ByteFlowSource(&buffer_reader_);
aes_xcode_byte_flow_ = AesCtrByteFlow();
aes_xcode_byte_flow_.init(std::move(aes_ctr_state_));
byte_flow_sink_ = ByteFlowSink();
byte_flow_source_ >> aes_xcode_byte_flow_ >> byte_flow_sink_;
byte_flow_flag_ = true;
fd_.set_output_reader(byte_flow_sink_.get_output());
break;
}
}
}
Status Binlog::load_binlog(const Callback &callback, const Callback &debug_callback) {
state_ = State::Load;
buffer_writer_ = ChainBufferWriter();
buffer_reader_ = buffer_writer_.extract_reader();
fd_.set_input_writer(&buffer_writer_);
detail::BinlogReader reader;
binlog_reader_ptr_ = &reader;
update_read_encryption();
bool ready_flag = false;
fd_.update_flags(Fd::Flag::Read);
info_.wrong_password = false;
while (true) {
BinlogEvent event;
auto r_need_size = reader.read_next(&event);
if (r_need_size.is_error()) {
LOG(ERROR) << r_need_size.error();
break;
}
auto need_size = r_need_size.move_as_ok();
// LOG(ERROR) << "need size = " << need_size;
if (need_size == 0) {
if (IGNORE_ERASE_HACK && event.type_ == BinlogEvent::ServiceTypes::Empty &&
(event.flags_ & BinlogEvent::Flags::Rewrite) != 0) {
// skip erase
} else {
if (debug_callback) {
debug_callback(event);
}
do_add_event(std::move(event));
if (info_.wrong_password) {
return Status::OK();
}
}
ready_flag = false;
} else {
// TODO(now): fix bug
if (ready_flag) {
break;
}
TRY_STATUS(fd_.flush_read(max(need_size, static_cast<size_t>(4096))));
buffer_reader_.sync_with_writer();
if (byte_flow_flag_) {
byte_flow_source_.wakeup();
}
ready_flag = true;
}
}
auto offset = processor_->offset();
processor_->for_each([&](BinlogEvent &event) {
VLOG(binlog) << "Replay binlog event: " << event;
if (callback) {
callback(event);
}
});
auto fd_size = fd_.get_size();
if (offset != fd_size) {
LOG(ERROR) << "Truncate " << tag("path", path_) << tag("old_size", fd_size) << tag("new_size", offset);
fd_.seek(offset).ensure();
fd_.truncate_to_current_position(offset).ensure();
db_key_used_ = false; // force reindex
}
CHECK(IGNORE_ERASE_HACK || fd_size_ == offset) << fd_size << " " << fd_size_ << " " << offset;
binlog_reader_ptr_ = nullptr;
state_ = State::Run;
buffer_writer_ = ChainBufferWriter();
buffer_reader_ = buffer_writer_.extract_reader();
// reuse aes_ctr_state_
if (encryption_type_ == EncryptionType::AesCtr) {
aes_ctr_state_ = aes_xcode_byte_flow_.move_aes_ctr_state();
}
update_write_encryption();
return Status::OK();
}
static int64 file_size(CSlice path) {
auto r_stat = stat(path);
if (r_stat.is_error()) {
return 0;
}
return r_stat.ok().size_;
}
void Binlog::update_encryption(Slice key, Slice iv) {
MutableSlice(aes_ctr_key_.raw, sizeof(aes_ctr_key_.raw)).copy_from(key);
UInt128 aes_ctr_iv;
MutableSlice(aes_ctr_iv.raw, sizeof(aes_ctr_iv.raw)).copy_from(iv);
aes_ctr_state_.init(aes_ctr_key_, aes_ctr_iv);
}
void Binlog::reset_encryption() {
if (db_key_.is_empty()) {
encryption_type_ = EncryptionType::None;
return;
}
using EncryptionEvent = detail::AesCtrEncryptionEvent;
EncryptionEvent event;
if (aes_ctr_key_salt_.empty()) {
event.key_salt_ = BufferSlice(EncryptionEvent::default_salt_size());
Random::secure_bytes(event.key_salt_.as_slice());
} else {
event.key_salt_ = aes_ctr_key_salt_.clone();
}
event.iv_ = BufferSlice(EncryptionEvent::iv_size());
Random::secure_bytes(event.iv_.as_slice());
BufferSlice key;
if (aes_ctr_key_salt_.as_slice() == event.key_salt_.as_slice()) {
key = BufferSlice(Slice(aes_ctr_key_.raw, sizeof(aes_ctr_key_.raw)));
} else {
key = event.generate_key(db_key_);
}
event.key_hash_ = event.generate_hash(key.as_slice());
do_event(BinlogEvent(
BinlogEvent::create_raw(0, BinlogEvent::ServiceTypes::AesCtrEncryption, 0, create_default_storer(event))));
}
void Binlog::do_reindex() {
flush_events_buffer(true);
// start reindex
CHECK(state_ == State::Run);
state_ = State::Reindex;
SCOPE_EXIT {
state_ = State::Run;
};
auto start_time = Clocks::monotonic();
auto start_size = file_size(path_);
auto start_events = fd_events_;
string new_path = path_ + ".new";
auto r_opened_file = open_binlog(new_path, FileFd::Flags::Write | FileFd::Flags::Create | FileFd::Truncate);
if (r_opened_file.is_error()) {
LOG(ERROR) << "Can't open new binlog for regenerate: " << r_opened_file.error();
return;
}
fd_.close();
fd_ = BufferedFdBase<FileFd>(r_opened_file.move_as_ok());
buffer_writer_ = ChainBufferWriter();
buffer_reader_ = buffer_writer_.extract_reader();
encryption_type_ = EncryptionType::None;
update_write_encryption();
// reindex
fd_size_ = 0;
fd_events_ = 0;
reset_encryption();
processor_->for_each([&](BinlogEvent &event) {
do_event(std::move(event)); // NB: no move is actually happens
});
need_sync_ = true; // must sync creation of the file
sync();
// finish_reindex
auto status = unlink(path_);
LOG_IF(FATAL, status.is_error()) << "Failed to unlink old binlog: " << status;
status = rename(new_path, path_);
LOG_IF(FATAL, status.is_error()) << "Failed to rename binlog: " << status;
auto finish_time = Clocks::monotonic();
auto finish_size = fd_size_;
auto finish_events = fd_events_;
CHECK(fd_size_ == file_size(path_));
// TODO: print warning only if time or ratio is suspicious
double ratio = static_cast<double>(start_size) / static_cast<double>(finish_size + 1);
LOG(INFO) << "regenerate index " << tag("name", path_) << tag("time", format::as_time(finish_time - start_time))
<< tag("before_size", format::as_size(start_size)) << tag("after_size", format::as_size(finish_size))
<< tag("ratio", ratio) << tag("before_events", start_events) << tag("after_events", finish_events);
buffer_writer_ = ChainBufferWriter();
buffer_reader_ = buffer_writer_.extract_reader();
// reuse aes_ctr_state_
if (encryption_type_ == EncryptionType::AesCtr) {
aes_ctr_state_ = aes_xcode_byte_flow_.move_aes_ctr_state();
}
update_write_encryption();
}
} // namespace td