98 lines
2.4 KiB
C++
98 lines
2.4 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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#pragma once
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#include "td/utils/common.h"
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#include <limits>
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namespace td {
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// More strict implementations of flood control than FloodControlFast.
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// Should be just fine for small counters.
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class FloodControlStrict {
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public:
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// there is no reason to return wakeup_at_, because it will be a time before the next allowed event, not current
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void add_event(double now) {
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events_.push_back(Event{now});
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if (without_update_ > 0) {
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without_update_--;
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} else {
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update(now);
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}
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}
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// no more than count in each duration
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void add_limit(int32 duration, size_t count) {
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limits_.push_back(Limit{duration, count, 0});
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without_update_ = 0;
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}
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double get_wakeup_at() const {
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return wakeup_at_;
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}
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void clear_events() {
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events_.clear();
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for (auto &limit : limits_) {
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limit.pos_ = 0;
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}
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without_update_ = 0;
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wakeup_at_ = 0.0;
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}
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private:
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void update(double now) {
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size_t min_pos = events_.size();
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without_update_ = std::numeric_limits<size_t>::max();
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for (auto &limit : limits_) {
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if (limit.count_ < events_.size() - limit.pos_) {
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limit.pos_ = events_.size() - limit.count_;
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}
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// binary-search? :D
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auto end_time = now - limit.duration_;
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while (limit.pos_ < events_.size() && events_[limit.pos_].timestamp_ < end_time) {
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limit.pos_++;
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}
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if (limit.count_ + limit.pos_ <= events_.size()) {
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CHECK(limit.count_ + limit.pos_ == events_.size());
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wakeup_at_ = max(wakeup_at_, events_[limit.pos_].timestamp_ + limit.duration_);
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without_update_ = 0;
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} else {
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without_update_ = min(without_update_, limit.count_ + limit.pos_ - events_.size() - 1);
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}
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min_pos = min(min_pos, limit.pos_);
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}
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if (min_pos * 2 > events_.size()) {
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for (auto &limit : limits_) {
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limit.pos_ -= min_pos;
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}
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events_.erase(events_.begin(), events_.begin() + min_pos);
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}
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}
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double wakeup_at_ = 0.0;
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struct Event {
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double timestamp_;
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};
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struct Limit {
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int32 duration_;
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size_t count_;
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size_t pos_;
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};
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size_t without_update_ = 0;
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vector<Event> events_;
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vector<Limit> limits_;
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};
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} // namespace td
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