Implement sanitizer support via CMake (#822)

Fixes #302

src/web/IntervalSweepHandler.cpp

@@ -0,0 +1,64 @@
+//------------------------------------------------------------------------------
+/*
+    This file is part of clio: https://github.com/XRPLF/clio
+    Copyright (c) 2023, the clio developers.
+
+    Permission to use, copy, modify, and distribute this software for any
+    purpose with or without fee is hereby granted, provided that the above
+    copyright notice and this permission notice appear in all copies.
+
+    THE  SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+    WITH  REGARD  TO  THIS  SOFTWARE  INCLUDING  ALL  IMPLIED  WARRANTIES  OF
+    MERCHANTABILITY  AND  FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+    ANY  SPECIAL,  DIRECT,  INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+    WHATSOEVER  RESULTING  FROM  LOSS  OF USE, DATA OR PROFITS, WHETHER IN AN
+    ACTION  OF  CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+    OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+*/
+//==============================================================================
+
+#include <web/IntervalSweepHandler.h>
+
+#include <web/DOSGuard.h>
+
+#include <algorithm>
+#include <ctime>
+
+namespace web {
+
+IntervalSweepHandler::IntervalSweepHandler(util::Config const& config, boost::asio::io_context& ctx)
+    : sweepInterval_{std::max(1u, static_cast<uint32_t>(config.valueOr("dos_guard.sweep_interval", 1.0) * 1000.0))}
+    , ctx_{std::ref(ctx)}
+    , timer_{ctx.get_executor()}
+{
+}
+
+IntervalSweepHandler::~IntervalSweepHandler()
+{
+    boost::asio::post(ctx_.get(), [this]() { timer_.cancel(); });
+}
+
+void
+IntervalSweepHandler::setup(web::BaseDOSGuard* guard)
+{
+    assert(dosGuard_ == nullptr);
+    dosGuard_ = guard;
+    assert(dosGuard_ != nullptr);
+
+    createTimer();
+}
+
+void
+IntervalSweepHandler::createTimer()
+{
+    timer_.expires_after(sweepInterval_);
+    timer_.async_wait([this](boost::system::error_code const& error) {
+        if (error == boost::asio::error::operation_aborted)
+            return;
+
+        dosGuard_->clear();
+        boost::asio::post(ctx_.get(), [this] { createTimer(); });
+    });
+}
+
+}  // namespace web