622 lines
17 KiB
C++
622 lines
17 KiB
C++
//
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// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2018
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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#include "td/db/binlog/Binlog.h"
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#include "td/db/binlog/detail/BinlogEventsBuffer.h"
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#include "td/db/binlog/detail/BinlogEventsProcessor.h"
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#include "td/utils/buffer.h"
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#include "td/utils/format.h"
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#include "td/utils/logging.h"
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#include "td/utils/misc.h"
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#include "td/utils/port/Clocks.h"
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#include "td/utils/port/Fd.h"
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#include "td/utils/port/path.h"
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#include "td/utils/port/Stat.h"
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#include "td/utils/Random.h"
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#include "td/utils/ScopeGuard.h"
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#include "td/utils/Status.h"
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#include "td/utils/Time.h"
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#include "td/utils/tl_helpers.h"
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#include "td/utils/tl_parsers.h"
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#include <algorithm>
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namespace td {
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namespace detail {
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struct AesCtrEncryptionEvent {
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static constexpr size_t min_salt_size() {
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return 16; // 256 bits
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}
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static constexpr size_t default_salt_size() {
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return 32; // 256 bits
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}
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static constexpr size_t key_size() {
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return 32; // 256 bits
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}
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static constexpr size_t iv_size() {
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return 16; // 128 bits
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}
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static constexpr size_t hash_size() {
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return 32; // 256 bits
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}
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static constexpr size_t kdf_iteration_count() {
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return 60002;
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}
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static constexpr size_t kdf_fast_iteration_count() {
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return 2;
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}
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BufferSlice key_salt_;
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BufferSlice iv_;
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BufferSlice key_hash_;
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BufferSlice generate_key(const DbKey &db_key) {
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CHECK(!db_key.is_empty());
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BufferSlice key(key_size());
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size_t iteration_count = kdf_iteration_count();
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if (db_key.is_raw_key()) {
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iteration_count = kdf_fast_iteration_count();
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}
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pbkdf2_sha256(db_key.data(), key_salt_.as_slice(), narrow_cast<int>(iteration_count), key.as_slice());
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return key;
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}
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BufferSlice generate_hash(Slice key) {
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BufferSlice hash(hash_size());
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hmac_sha256(key, "cucumbers everywhere", hash.as_slice());
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return hash;
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}
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template <class StorerT>
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void store(StorerT &storer) const {
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using td::store;
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BEGIN_STORE_FLAGS();
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END_STORE_FLAGS();
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store(key_salt_, storer);
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store(iv_, storer);
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store(key_hash_, storer);
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}
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template <class ParserT>
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void parse(ParserT &&parser) {
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using td::parse;
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BEGIN_PARSE_FLAGS();
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END_PARSE_FLAGS();
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parse(key_salt_, parser);
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parse(iv_, parser);
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parse(key_hash_, parser);
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}
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};
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class BinlogReader {
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public:
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BinlogReader() = default;
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explicit BinlogReader(ChainBufferReader *input) : input_(input) {
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}
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void set_input(ChainBufferReader *input) {
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input_ = input;
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}
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int64 offset() {
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return offset_;
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}
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Result<size_t> read_next(BinlogEvent *event) {
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if (state_ == ReadLength) {
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if (input_->size() < 4) {
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return 4;
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}
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auto it = input_->clone();
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char buf[4];
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it.advance(4, MutableSlice(buf, 4));
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size_ = static_cast<size_t>(TlParser(Slice(buf, 4)).fetch_int());
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if (size_ > MAX_EVENT_SIZE) {
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return Status::Error(PSLICE() << "Too big event " << tag("size", size_));
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}
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if (size_ < MIN_EVENT_SIZE) {
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return Status::Error(PSLICE() << "Too small event " << tag("size", size_));
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}
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state_ = ReadEvent;
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}
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if (input_->size() < size_) {
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return size_;
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}
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TRY_STATUS(event->init(input_->cut_head(size_).move_as_buffer_slice()));
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offset_ += size_;
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event->offset_ = offset_;
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state_ = ReadLength;
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return 0;
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}
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private:
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ChainBufferReader *input_;
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enum { ReadLength, ReadEvent } state_ = ReadLength;
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size_t size_{0};
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int64 offset_{0};
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};
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} // namespace detail
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bool Binlog::IGNORE_ERASE_HACK = false;
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Binlog::Binlog() = default;
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Binlog::~Binlog() {
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close().ignore();
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}
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Result<FileFd> Binlog::open_binlog(CSlice path, int32 flags) {
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TRY_RESULT(fd, FileFd::open(path, flags));
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TRY_STATUS(fd.lock(FileFd::LockFlags::Write, 100));
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return std::move(fd);
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}
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Status Binlog::init(string path, const Callback &callback, DbKey db_key, DbKey old_db_key, int32 dummy,
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const Callback &debug_callback) {
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close().ignore();
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db_key_ = std::move(db_key);
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old_db_key_ = std::move(old_db_key);
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processor_ = std::make_unique<detail::BinlogEventsProcessor>();
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// Turn off BinlogEventsBuffer
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// events_buffer_ = std::make_unique<detail::BinlogEventsBuffer>();
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// try to restore binlog from regenerated version
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if (stat(path).is_error()) {
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rename(PSLICE() << path << ".new", path).ignore();
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}
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info_ = BinlogInfo();
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info_.was_created = stat(path).is_error();
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TRY_RESULT(fd, open_binlog(path, FileFd::Flags::Read | FileFd::Flags::Write | FileFd::Flags::Create));
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fd_ = BufferedFdBase<FileFd>(std::move(fd));
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fd_size_ = 0;
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path_ = std::move(path);
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auto status = load_binlog(callback, debug_callback);
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if (status.is_error()) {
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close().ignore();
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return status;
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}
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info_.last_id = processor_->last_id();
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last_id_ = processor_->last_id();
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if (info_.wrong_password) {
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close().ignore();
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return Status::Error(Error::WrongPassword, "Wrong password");
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}
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if ((!db_key_.is_empty() && !db_key_used_) || (db_key_.is_empty() && encryption_type_ != EncryptionType::None)) {
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aes_ctr_key_salt_ = BufferSlice();
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do_reindex();
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}
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info_.is_opened = true;
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return Status::OK();
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}
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void Binlog::add_event(BinlogEvent &&event) {
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if (!events_buffer_) {
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do_add_event(std::move(event));
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} else {
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events_buffer_->add_event(std::move(event));
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}
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lazy_flush();
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if (state_ == State::Run) {
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auto fd_size = fd_size_;
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if (events_buffer_) {
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fd_size += events_buffer_->size();
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}
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auto need_reindex = [&](int64 min_size, int rate) {
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return fd_size > min_size && fd_size / rate > processor_->total_raw_events_size();
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};
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if (need_reindex(100000, 5) || need_reindex(500000, 2)) {
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LOG(INFO) << tag("fd_size", format::as_size(fd_size))
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<< tag("total events size", format::as_size(processor_->total_raw_events_size()));
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do_reindex();
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}
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}
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}
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size_t Binlog::flush_events_buffer(bool force) {
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if (!events_buffer_) {
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return 0;
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}
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if (!force && !events_buffer_->need_flush()) {
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return events_buffer_->size();
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}
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CHECK(!in_flush_events_buffer_);
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in_flush_events_buffer_ = true;
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events_buffer_->flush([&](BinlogEvent &&event) { this->do_add_event(std::move(event)); });
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in_flush_events_buffer_ = false;
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return 0;
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}
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void Binlog::do_add_event(BinlogEvent &&event) {
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if (event.flags_ & BinlogEvent::Flags::Partial) {
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event.flags_ &= ~BinlogEvent::Flags::Partial;
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pending_events_.emplace_back(std::move(event));
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} else {
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for (auto &pending_event : pending_events_) {
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do_event(std::move(pending_event));
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}
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pending_events_.clear();
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do_event(std::move(event));
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}
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}
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Status Binlog::close(bool need_sync) {
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if (fd_.empty()) {
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return Status::OK();
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}
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SCOPE_EXIT {
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path_ = "";
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info_.is_opened = false;
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fd_.close();
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};
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flush();
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if (need_sync) {
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TRY_STATUS(fd_.sync());
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}
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return Status::OK();
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}
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void Binlog::change_key(DbKey new_db_key) {
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db_key_ = std::move(new_db_key);
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aes_ctr_key_salt_ = BufferSlice();
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do_reindex();
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}
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Status Binlog::close_and_destroy() {
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auto path = path_;
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auto close_status = close(false);
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destroy(path).ignore();
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return close_status;
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}
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Status Binlog::destroy(Slice path) {
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unlink(PSLICE() << path).ignore();
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unlink(PSLICE() << path << ".new").ignore();
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return Status::OK();
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}
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void Binlog::do_event(BinlogEvent &&event) {
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fd_events_++;
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fd_size_ += event.raw_event_.size();
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if (state_ == State::Run || state_ == State::Reindex) {
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VLOG(binlog) << "Write binlog event: " << format::cond(state_ == State::Reindex, "[reindex] ") << event;
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switch (encryption_type_) {
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case EncryptionType::None: {
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buffer_writer_.append(event.raw_event_.clone());
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break;
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}
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case EncryptionType::AesCtr: {
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buffer_writer_.append(event.raw_event_.as_slice());
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break;
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}
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}
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}
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if (event.type_ < 0) {
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if (event.type_ == BinlogEvent::ServiceTypes::AesCtrEncryption) {
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detail::AesCtrEncryptionEvent encryption_event;
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encryption_event.parse(TlParser(event.data_));
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BufferSlice key;
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if (aes_ctr_key_salt_.as_slice() == encryption_event.key_salt_.as_slice()) {
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key = BufferSlice(Slice(aes_ctr_key_.raw, sizeof(aes_ctr_key_.raw)));
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} else if (!db_key_.is_empty()) {
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key = encryption_event.generate_key(db_key_);
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}
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if (encryption_event.generate_hash(key.as_slice()).as_slice() != encryption_event.key_hash_.as_slice()) {
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CHECK(state_ == State::Load);
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if (!old_db_key_.is_empty()) {
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key = encryption_event.generate_key(old_db_key_);
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if (encryption_event.generate_hash(key.as_slice()).as_slice() != encryption_event.key_hash_.as_slice()) {
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info_.wrong_password = true;
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}
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} else {
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info_.wrong_password = true;
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}
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} else {
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db_key_used_ = true;
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}
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encryption_type_ = EncryptionType::AesCtr;
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aes_ctr_key_salt_ = encryption_event.key_salt_.copy();
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update_encryption(key.as_slice(), encryption_event.iv_.as_slice());
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if (state_ == State::Load) {
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update_read_encryption();
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LOG(INFO) << "Load: init encryption";
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} else {
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CHECK(state_ == State::Reindex);
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flush();
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update_write_encryption();
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//LOG(INFO) << format::cond(state_ == State::Run, "Run", "Reindex") << ": init encryption";
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}
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return;
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}
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}
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if (state_ != State::Reindex) {
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processor_->add_event(std::move(event));
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}
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}
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void Binlog::sync() {
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flush();
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fd_.sync().ensure();
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}
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void Binlog::flush() {
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if (state_ == State::Load) {
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return;
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}
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flush_events_buffer(true);
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// NB: encryption happens during flush
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if (byte_flow_flag_) {
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byte_flow_source_.wakeup();
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}
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fd_.flush_write().ensure();
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need_flush_since_ = 0;
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}
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void Binlog::lazy_flush() {
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size_t events_buffer_size = flush_events_buffer(false /*force*/);
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buffer_reader_.sync_with_writer();
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auto size = buffer_reader_.size() + events_buffer_size;
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if (size > (1 << 14)) {
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flush();
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} else if (size > 0 && need_flush_since_ == 0) {
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need_flush_since_ = Time::now_cached();
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}
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}
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void Binlog::update_read_encryption() {
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CHECK(binlog_reader_ptr_);
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switch (encryption_type_) {
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case EncryptionType::None: {
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binlog_reader_ptr_->set_input(&buffer_reader_);
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byte_flow_flag_ = false;
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break;
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}
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case EncryptionType::AesCtr: {
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byte_flow_source_ = ByteFlowSource(&buffer_reader_);
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aes_xcode_byte_flow_ = AesCtrByteFlow();
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aes_xcode_byte_flow_.init(std::move(aes_ctr_state_));
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byte_flow_sink_ = ByteFlowSink();
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byte_flow_source_ >> aes_xcode_byte_flow_ >> byte_flow_sink_;
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byte_flow_flag_ = true;
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binlog_reader_ptr_->set_input(byte_flow_sink_.get_output());
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break;
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}
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}
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}
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void Binlog::update_write_encryption() {
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switch (encryption_type_) {
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case EncryptionType::None: {
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fd_.set_output_reader(&buffer_reader_);
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byte_flow_flag_ = false;
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break;
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}
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case EncryptionType::AesCtr: {
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byte_flow_source_ = ByteFlowSource(&buffer_reader_);
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aes_xcode_byte_flow_ = AesCtrByteFlow();
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aes_xcode_byte_flow_.init(std::move(aes_ctr_state_));
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byte_flow_sink_ = ByteFlowSink();
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byte_flow_source_ >> aes_xcode_byte_flow_ >> byte_flow_sink_;
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byte_flow_flag_ = true;
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fd_.set_output_reader(byte_flow_sink_.get_output());
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break;
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}
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}
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}
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Status Binlog::load_binlog(const Callback &callback, const Callback &debug_callback) {
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state_ = State::Load;
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buffer_writer_ = ChainBufferWriter();
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buffer_reader_ = buffer_writer_.extract_reader();
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fd_.set_input_writer(&buffer_writer_);
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detail::BinlogReader reader;
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binlog_reader_ptr_ = &reader;
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update_read_encryption();
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bool ready_flag = false;
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fd_.update_flags(Fd::Flag::Read);
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info_.wrong_password = false;
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while (true) {
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BinlogEvent event;
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auto r_need_size = reader.read_next(&event);
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if (r_need_size.is_error()) {
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LOG(ERROR) << r_need_size.error();
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break;
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}
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auto need_size = r_need_size.move_as_ok();
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// LOG(ERROR) << "need size = " << need_size;
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if (need_size == 0) {
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if (IGNORE_ERASE_HACK && event.type_ == BinlogEvent::ServiceTypes::Empty &&
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(event.flags_ & BinlogEvent::Flags::Rewrite) != 0) {
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// skip erase
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} else {
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if (debug_callback) {
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debug_callback(event);
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}
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do_add_event(std::move(event));
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if (info_.wrong_password) {
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return Status::OK();
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}
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}
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ready_flag = false;
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} else {
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// TODO(now): fix bug
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if (ready_flag) {
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break;
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}
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TRY_STATUS(fd_.flush_read(std::max(need_size, static_cast<size_t>(4096))));
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buffer_reader_.sync_with_writer();
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if (byte_flow_flag_) {
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byte_flow_source_.wakeup();
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}
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ready_flag = true;
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}
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}
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auto offset = processor_->offset();
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processor_->for_each([&](BinlogEvent &event) {
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VLOG(binlog) << "Replay binlog event: " << event;
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if (callback) {
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callback(event);
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}
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});
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auto fd_size = fd_.get_size();
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if (offset != fd_size) {
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LOG(ERROR) << "Truncate " << tag("path", path_) << tag("old_size", fd_size) << tag("new_size", offset);
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fd_.seek(offset).ensure();
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fd_.truncate_to_current_position(offset).ensure();
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db_key_used_ = false; // force reindex
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}
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CHECK(IGNORE_ERASE_HACK || fd_size_ == offset);
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binlog_reader_ptr_ = nullptr;
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state_ = State::Run;
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buffer_writer_ = ChainBufferWriter();
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buffer_reader_ = buffer_writer_.extract_reader();
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// reuse aes_ctr_state_
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if (encryption_type_ == EncryptionType::AesCtr) {
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aes_ctr_state_ = aes_xcode_byte_flow_.move_aes_ctr_state();
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}
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update_write_encryption();
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return Status::OK();
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}
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static int64 file_size(CSlice path) {
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auto r_stat = stat(path);
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if (r_stat.is_error()) {
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return 0;
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}
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return r_stat.ok().size_;
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}
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void Binlog::update_encryption(Slice key, Slice iv) {
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MutableSlice(aes_ctr_key_.raw, sizeof(aes_ctr_key_.raw)).copy_from(key);
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UInt128 aes_ctr_iv;
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MutableSlice(aes_ctr_iv.raw, sizeof(aes_ctr_iv.raw)).copy_from(iv);
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aes_ctr_state_.init(aes_ctr_key_, aes_ctr_iv);
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}
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void Binlog::reset_encryption() {
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if (db_key_.is_empty()) {
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encryption_type_ = EncryptionType::None;
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return;
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}
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|
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using EncryptionEvent = detail::AesCtrEncryptionEvent;
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EncryptionEvent event;
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if (aes_ctr_key_salt_.empty()) {
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event.key_salt_ = BufferSlice(EncryptionEvent::default_salt_size());
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Random::secure_bytes(event.key_salt_.as_slice());
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} else {
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event.key_salt_ = aes_ctr_key_salt_.clone();
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}
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event.iv_ = BufferSlice(EncryptionEvent::iv_size());
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Random::secure_bytes(event.iv_.as_slice());
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|
|
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BufferSlice key;
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if (aes_ctr_key_salt_.as_slice() == event.key_salt_.as_slice()) {
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key = BufferSlice(Slice(aes_ctr_key_.raw, sizeof(aes_ctr_key_.raw)));
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} else {
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key = event.generate_key(db_key_);
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}
|
|
|
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event.key_hash_ = event.generate_hash(key.as_slice());
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|
|
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do_event(BinlogEvent(
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BinlogEvent::create_raw(0, BinlogEvent::ServiceTypes::AesCtrEncryption, 0, create_default_storer(event))));
|
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}
|
|
|
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void Binlog::do_reindex() {
|
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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
|
|
});
|
|
flush();
|
|
LOG_IF(FATAL, fd_.need_flush_write()) << "Reindex failed: failed to flush everything on disk";
|
|
auto status = fd_.sync();
|
|
LOG_IF(FATAL, status.is_error()) << "Failed to sync binlog: " << status;
|
|
|
|
// finish_reindex
|
|
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
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