110 lines
3.1 KiB
C++
110 lines
3.1 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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#pragma once
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#include "td/utils/buffer.h"
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#include "td/utils/common.h"
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#include "td/utils/crypto.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/Slice.h"
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#include "td/utils/Status.h"
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#include "td/utils/Storer.h"
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#include "td/utils/StringBuilder.h"
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#include "td/utils/tl_storers.h"
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namespace td {
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struct EmptyStorerImpl {
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EmptyStorerImpl() {
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}
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template <class StorerT>
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void store(StorerT &storer) const {
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}
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};
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inline auto EmptyStorer() {
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static const EmptyStorerImpl impl;
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return create_default_storer(impl);
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}
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static constexpr size_t MAX_EVENT_SIZE = 1 << 24;
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static constexpr size_t EVENT_HEADER_SIZE = 4 + 8 + 4 + 4 + 8;
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static constexpr size_t EVENT_TAIL_SIZE = 4;
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static constexpr size_t MIN_EVENT_SIZE = EVENT_HEADER_SIZE + EVENT_TAIL_SIZE;
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extern int32 VERBOSITY_NAME(binlog);
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// TODO: smaller BinlogEvent
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struct BinlogEvent {
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int64 offset_;
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uint32 size_;
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uint64 id_;
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int32 type_; // type can be merged with flags
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int32 flags_;
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uint64 extra_;
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MutableSlice data_;
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uint32 crc32_;
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BufferSlice raw_event_;
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enum ServiceTypes { Header = -1, Empty = -2, AesCtrEncryption = -3, NoEncryption = -4 };
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enum Flags { Rewrite = 1, Partial = 2 };
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void clear() {
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raw_event_ = BufferSlice();
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}
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bool empty() const {
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return raw_event_.empty();
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}
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BinlogEvent clone() const {
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BinlogEvent result;
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result.init(raw_event_.clone()).ensure();
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return result;
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}
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BufferSlice data_as_buffer_slice() const {
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return raw_event_.from_slice(data_);
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}
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BinlogEvent() = default;
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explicit BinlogEvent(BufferSlice &&raw_event) {
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init(std::move(raw_event), false).ensure();
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}
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Status init(BufferSlice &&raw_event, bool check_crc = true) TD_WARN_UNUSED_RESULT;
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static BufferSlice create_raw(uint64 id, int32 type, int32 flags, const Storer &storer);
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};
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inline StringBuilder &operator<<(StringBuilder &sb, const BinlogEvent &event) {
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return sb << "LogEvent[" << tag("id", format::as_hex(event.id_)) << tag("type", event.type_)
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<< tag("flags", event.flags_) << tag("data", format::as_hex_dump<4>(event.data_)) << "]";
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}
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// Implementation
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inline BufferSlice BinlogEvent::create_raw(uint64 id, int32 type, int32 flags, const Storer &storer) {
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auto raw_event = BufferSlice{storer.size() + MIN_EVENT_SIZE};
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TlStorerUnsafe tl_storer(raw_event.as_slice().begin());
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tl_storer.store_int(narrow_cast<int32>(raw_event.size()));
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tl_storer.store_long(id);
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tl_storer.store_int(type);
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tl_storer.store_int(flags);
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tl_storer.store_long(0);
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CHECK(tl_storer.get_buf() == raw_event.as_slice().begin() + EVENT_HEADER_SIZE);
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tl_storer.store_storer(storer);
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CHECK(tl_storer.get_buf() == raw_event.as_slice().end() - EVENT_TAIL_SIZE);
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tl_storer.store_int(::td::crc32(raw_event.as_slice().truncate(raw_event.size() - EVENT_TAIL_SIZE)));
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return raw_event;
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}
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} // namespace td
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