79 lines
2.7 KiB
C++
79 lines
2.7 KiB
C++
//
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// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2021
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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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Status BinlogEvent::init(BufferSlice &&raw_event, bool check_crc) {
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TlParser parser(raw_event.as_slice());
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size_ = parser.fetch_int();
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LOG_CHECK(size_ == raw_event.size()) << size_ << " " << raw_event.size() << debug_info_;
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id_ = parser.fetch_long();
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type_ = parser.fetch_int();
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flags_ = parser.fetch_int();
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extra_ = parser.fetch_long();
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CHECK(size_ >= MIN_SIZE);
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auto slice_data = parser.fetch_string_raw<Slice>(size_ - MIN_SIZE);
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data_ = MutableSlice(const_cast<char *>(slice_data.begin()), slice_data.size());
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crc32_ = static_cast<uint32>(parser.fetch_int());
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if (check_crc) {
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auto calculated_crc = crc32(raw_event.as_slice().substr(0, size_ - TAIL_SIZE));
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if (calculated_crc != 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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}
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raw_event_ = std::move(raw_event);
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return Status::OK();
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}
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Status BinlogEvent::validate() const {
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BinlogEvent event;
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if (raw_event_.size() < 4) {
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return Status::Error("Too small event");
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}
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uint32 size = TlParser(raw_event_.as_slice().substr(0, 4)).fetch_int();
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if (size_ != 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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return event.init(raw_event_.clone(), true);
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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_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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void BinlogEvent::realloc() {
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auto data_offset = data_.begin() - raw_event_.as_slice().begin();
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auto data_size = data_.size();
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raw_event_ = raw_event_.copy();
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data_ = raw_event_.as_slice().substr(data_offset, data_size);
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}
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} // namespace td
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