tdlight/tddb/td/db/binlog/detail/BinlogEventsProcessor.cpp

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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)
//
#include "td/db/binlog/detail/BinlogEventsProcessor.h"
#include "td/utils/logging.h"
#include <algorithm>
namespace td {
namespace detail {
void BinlogEventsProcessor::do_event(BinlogEvent &&event) {
offset_ = event.offset_;
auto fixed_id = event.id_ * 2;
if ((event.flags_ & BinlogEvent::Flags::Rewrite) && !ids_.empty() && ids_.back() >= fixed_id) {
auto it = std::lower_bound(ids_.begin(), ids_.end(), fixed_id);
if (it == ids_.end() || *it != fixed_id) {
LOG(FATAL) << "Ignore rewrite logevent";
return;
}
auto pos = it - ids_.begin();
total_raw_events_size_ -= static_cast<int64>(events_[pos].raw_event_.size());
if (event.type_ == BinlogEvent::ServiceTypes::Empty) {
*it += 1;
empty_events_++;
events_[pos].clear();
} else {
event.flags_ &= ~BinlogEvent::Flags::Rewrite;
total_raw_events_size_ += static_cast<int64>(event.raw_event_.size());
events_[pos] = std::move(event);
}
} else if (event.type_ == BinlogEvent::ServiceTypes::Empty) {
// just skip this event
} else {
CHECK(ids_.empty() || ids_.back() < fixed_id);
last_id_ = event.id_;
total_raw_events_size_ += static_cast<int64>(event.raw_event_.size());
total_events_++;
ids_.push_back(fixed_id);
events_.emplace_back(std::move(event));
}
if (total_events_ > 10 && empty_events_ * 4 > total_events_ * 3) {
compactify();
}
}
void BinlogEventsProcessor::compactify() {
CHECK(ids_.size() == events_.size());
auto ids_from = ids_.begin();
auto ids_to = ids_from;
auto events_from = events_.begin();
auto events_to = events_from;
for (; ids_from != ids_.end(); ids_from++, events_from++) {
if ((*ids_from & 1) == 0) {
*ids_to++ = *ids_from;
*events_to++ = std::move(*events_from);
}
}
ids_.erase(ids_to, ids_.end());
events_.erase(events_to, events_.end());
total_events_ = ids_.size();
empty_events_ = 0;
CHECK(ids_.size() == events_.size());
}
} // namespace detail
} // namespace td