75 lines
2.8 KiB
C++
75 lines
2.8 KiB
C++
//
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// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2023
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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/BinlogEvent.h"
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#include "td/utils/crypto.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/tl_parsers.h"
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#include "td/utils/tl_storers.h"
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namespace td {
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void BinlogEvent::init(string raw_event) {
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TlParser parser(as_slice(raw_event));
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size_ = static_cast<uint32>(parser.fetch_int());
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LOG_CHECK(size_ == raw_event.size()) << size_ << ' ' << raw_event.size() << debug_info_;
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id_ = static_cast<uint64>(parser.fetch_long());
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type_ = parser.fetch_int();
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flags_ = parser.fetch_int();
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extra_ = static_cast<uint64>(parser.fetch_long());
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CHECK(size_ >= MIN_SIZE);
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parser.fetch_string_raw<Slice>(size_ - MIN_SIZE); // skip data
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crc32_ = static_cast<uint32>(parser.fetch_int());
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raw_event_ = std::move(raw_event);
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}
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Slice BinlogEvent::get_data() const {
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CHECK(raw_event_.size() >= MIN_SIZE);
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return Slice(as_slice(raw_event_).data() + HEADER_SIZE, raw_event_.size() - MIN_SIZE);
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}
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Status BinlogEvent::validate() const {
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if (raw_event_.size() < MIN_SIZE) {
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return Status::Error("Too small event");
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}
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TlParser parser(as_slice(raw_event_));
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uint32 size = static_cast<uint32>(parser.fetch_int());
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if (size_ != size || size_ != raw_event_.size()) {
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return Status::Error(PSLICE() << "Size of event changed: " << tag("was", size_) << tag("now", size));
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}
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parser.fetch_string_raw<Slice>(size_ - TAIL_SIZE - sizeof(int)); // skip
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auto stored_crc32 = static_cast<uint32>(parser.fetch_int());
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auto calculated_crc = crc32(Slice(as_slice(raw_event_).data(), size_ - TAIL_SIZE));
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if (calculated_crc != crc32_ || calculated_crc != stored_crc32) {
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return Status::Error(PSLICE() << "CRC mismatch " << tag("actual", format::as_hex(calculated_crc))
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<< tag("expected", format::as_hex(crc32_)) << public_to_string());
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}
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return Status::OK();
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}
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BufferSlice BinlogEvent::create_raw(uint64 id, int32 type, int32 flags, const Storer &storer) {
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auto raw_event = BufferSlice{storer.size() + MIN_SIZE};
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TlStorerUnsafe tl_storer(raw_event.as_mutable_slice().ubegin());
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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().ubegin() + HEADER_SIZE);
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tl_storer.store_storer(storer);
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CHECK(tl_storer.get_buf() == raw_event.as_slice().uend() - TAIL_SIZE);
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tl_storer.store_int(crc32(raw_event.as_slice().truncate(raw_event.size() - TAIL_SIZE)));
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return raw_event;
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}
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} // namespace td
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