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tdlib-fork/tddb/td/db/binlog/BinlogEvent.h

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