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tdutils/td/utils/FloodControlFast.h

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+/*
+    This file is part of TON Blockchain Library.
+
+    TON Blockchain Library is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Lesser General Public License as published by
+    the Free Software Foundation, either version 2 of the License, or
+    (at your option) any later version.
+
+    TON Blockchain Library is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Lesser General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public License
+    along with TON Blockchain Library.  If not, see <http://www.gnu.org/licenses/>.
+
+    Copyright 2017-2019 Telegram Systems LLP
+*/
+#pragma once
+
+#include "td/utils/common.h"
+#include "td/utils/TimedStat.h"
+
+namespace td {
+
+class FloodControlFast {
+ public:
+  uint32 add_event(int32 now) {
+    for (auto &limit : limits_) {
+      limit.stat_.add_event(CounterStat::Event(), now);
+      if (limit.stat_.get_stat(now).count_ > limit.count_) {
+        wakeup_at_ = max(wakeup_at_, now + limit.duration_ * 2);
+      }
+    }
+    return wakeup_at_;
+  }
+  uint32 get_wakeup_at() {
+    return wakeup_at_;
+  }
+
+  void add_limit(uint32 duration, int32 count) {
+    limits_.push_back({TimedStat<CounterStat>(duration, 0), duration, count});
+  }
+
+  void clear_events() {
+    for (auto &limit : limits_) {
+      limit.stat_.clear_events();
+    }
+    wakeup_at_ = 0;
+  }
+
+ private:
+  class CounterStat {
+   public:
+    struct Event {};
+    int32 count_ = 0;
+    void on_event(Event e) {
+      count_++;
+    }
+    void clear() {
+      count_ = 0;
+    }
+  };
+
+  uint32 wakeup_at_ = 0;
+  struct Limit {
+    TimedStat<CounterStat> stat_;
+    uint32 duration_;
+    int32 count_;
+  };
+  std::vector<Limit> limits_;
+};
+
+}  // namespace td