mirror of
https://github.com/XRPLF/clio.git
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//------------------------------------------------------------------------------
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/*
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This file is part of clio: https://github.com/XRPLF/clio
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Copyright (c) 2022, the clio developers.
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Permission to use, copy, modify, and distribute this software for any
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purpose with or without fee is hereby granted, provided that the above
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copyright notice and this permission notice appear in all copies.
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THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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//==============================================================================
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#pragma once
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#include <boost/asio.hpp>
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#include <boost/iterator/transform_iterator.hpp>
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#include <boost/system/error_code.hpp>
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#include <algorithm>
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#include <chrono>
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#include <ctime>
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namespace web::detail {
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/**
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* @brief Sweep handler using a steady_timer and boost::asio::io_context.
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*/
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class IntervalSweepHandler
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{
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std::chrono::milliseconds sweepInterval_;
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std::reference_wrapper<boost::asio::io_context> ctx_;
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boost::asio::steady_timer timer_;
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web::BaseDOSGuard* dosGuard_ = nullptr;
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public:
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/**
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* @brief Construct a new interval-based sweep handler
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*
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* @param config Clio config
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* @param ctx The boost::asio::io_context
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*/
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IntervalSweepHandler(util::Config const& config, boost::asio::io_context& ctx)
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: sweepInterval_{std::max(1u, static_cast<uint32_t>(config.valueOr("dos_guard.sweep_interval", 1.0) * 1000.0))}
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, ctx_{std::ref(ctx)}
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, timer_{ctx.get_executor()}
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{
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}
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~IntervalSweepHandler()
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{
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timer_.cancel();
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}
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/**
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* @brief This setup member function is called by @ref BasicDOSGuard during
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* its initialization.
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*
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* @param guard Pointer to the dos guard
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*/
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void
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setup(web::BaseDOSGuard* guard)
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{
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assert(dosGuard_ == nullptr);
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dosGuard_ = guard;
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assert(dosGuard_ != nullptr);
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createTimer();
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}
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private:
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void
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createTimer()
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{
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timer_.expires_after(sweepInterval_);
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timer_.async_wait([this](boost::system::error_code const& error) {
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if (error == boost::asio::error::operation_aborted)
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return;
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dosGuard_->clear();
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boost::asio::post(ctx_.get().get_executor(), [this] { createTimer(); });
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});
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}
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};
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} // namespace web::detail
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