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https://github.com/OpenVPN/openvpn3.git
synced 2024-09-20 04:02:15 +02:00
Added class RunContext for managing threads in a
multi-threaded server.
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openvpn/common/runcontext.hpp
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253
openvpn/common/runcontext.hpp
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// OpenVPN -- An application to securely tunnel IP networks
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// over a single port, with support for SSL/TLS-based
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// session authentication and key exchange,
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// packet encryption, packet authentication, and
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// packet compression.
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//
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// Copyright (C) 2012-2015 OpenVPN Technologies, Inc.
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License Version 3
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// as published by the Free Software Foundation.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program in the COPYING file.
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// If not, see <http://www.gnu.org/licenses/>.
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#ifndef OPENVPN_COMMON_RUNCONTEXT_H
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#define OPENVPN_COMMON_RUNCONTEXT_H
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#include <openvpn/common/exception.hpp>
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#include <openvpn/common/types.hpp>
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#include <openvpn/common/thread.hpp>
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#include <openvpn/common/asiosignal.hpp>
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#include <openvpn/common/asiodispatch.hpp>
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#include <openvpn/common/signal.hpp>
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#include <openvpn/time/time.hpp>
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#include <openvpn/time/asiotimer.hpp>
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#include <openvpn/time/timestr.hpp>
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namespace openvpn {
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template <typename ServerThread, typename Stats>
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class RunContext : public LogBase
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{
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struct Thread
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{
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Thread() : thread(NULL) {}
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Thread(Thread&& ref)
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: thread(ref.thread),
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serv(std::move(ref.serv))
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{
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ref.thread = NULL;
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}
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Thread(boost::thread* thread_arg) : thread(thread_arg) {}
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~Thread() { delete thread; }
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Thread(const Thread&) = delete;
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Thread& operator=(const Thread&) = delete;
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boost::thread* thread;
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typename ServerThread::Ptr serv;
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};
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public:
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typedef boost::intrusive_ptr<RunContext> Ptr;
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class ThreadContext
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{
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public:
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ThreadContext(RunContext& ctx_arg)
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: ctx(ctx_arg)
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{
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ctx.add_thread();
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}
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~ThreadContext()
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{
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ctx.remove_thread();
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}
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private:
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RunContext& ctx;
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};
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RunContext()
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: io_service(1),
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exit_timer(io_service),
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threads_added(0),
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threads_removed(0),
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log_context(this),
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log_wrap(),
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halt(false)
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{
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signals.reset(new ASIOSignals(io_service));
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signal_rearm();
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#ifdef OPENVPN_EXIT_IN
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exit_timer.expires_at(Time::now() + Time::Duration::seconds(OPENVPN_EXIT_IN));
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exit_timer.async_wait(asio_dispatch_timer(&RunContext::exit_timer_callback, this));
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#endif
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}
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void set_thread(const unsigned int unit, boost::thread* thread)
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{
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BOOST_ASSERT(unit == threads.size());
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threads.emplace_back(thread);
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}
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// called from worker thread
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void set_server(const unsigned int unit, const typename ServerThread::Ptr& serv)
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{
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Mutex::scoped_lock lock(mutex);
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threads[unit].serv = serv;
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}
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// called from worker thread
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void clear_server(const unsigned int unit)
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{
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Mutex::scoped_lock lock(mutex);
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threads[unit].serv.reset();
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}
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void run()
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{
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if (!halt)
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{
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io_service.run();
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}
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}
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void join()
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{
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for (size_t i = 0; i < threads.size(); ++i)
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threads[i].thread->join();
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}
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virtual void log(const std::string& str)
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{
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const std::string ts = date_time();
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{
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Mutex::scoped_lock lock(log_mutex);
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std::cout << ts << ' ' << str;
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std::cout.flush();
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}
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}
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const Log::Context::Wrapper& log_wrapper() { return log_wrap; }
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void set_stats_obj(const typename Stats::Ptr& stats_arg)
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{
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stats = stats_arg;
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}
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private:
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// called from worker thread
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void add_thread()
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{
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Mutex::scoped_lock lock(mutex);
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++threads_added;
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}
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// called from worker thread
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void remove_thread()
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{
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Mutex::scoped_lock lock(mutex);
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++threads_removed;
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test_completion();
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}
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void test_completion()
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{
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const size_t s = threads.size();
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if (threads_added == s && threads_removed == s)
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do_cancel();
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}
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void cancel()
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{
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Mutex::scoped_lock lock(mutex);
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do_cancel();
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}
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// may be called from worker thread
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void do_cancel()
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{
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if (!halt)
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{
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halt = true;
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exit_timer.cancel();
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if (signals)
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io_service.post(asio_dispatch_post(&ASIOSignals::cancel, signals.get()));
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for (size_t i = 0; i < threads.size(); ++i)
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{
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Thread& thr = threads[i];
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if (thr.serv)
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thr.serv->thread_safe_stop();
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thr.serv.reset();
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}
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}
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}
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void exit_timer_callback(const boost::system::error_code& e)
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{
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if (!e && !halt)
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{
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cancel();
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}
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}
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void signal(const boost::system::error_code& error, int signum)
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{
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if (!error && !halt)
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{
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OPENVPN_LOG("ASIO SIGNAL " << signum);
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switch (signum)
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{
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case SIGINT:
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case SIGTERM:
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case SIGQUIT:
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cancel();
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break;
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case SIGUSR2:
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if (stats)
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OPENVPN_LOG(stats->dump());
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signal_rearm();
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break;
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}
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}
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}
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void signal_rearm()
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{
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signals->register_signals_all(asio_dispatch_signal(&RunContext::signal, this));
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}
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boost::asio::io_service io_service;
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typename Stats::Ptr stats;
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ASIOSignals::Ptr signals;
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AsioTimer exit_timer;
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std::vector<Thread> threads;
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unsigned int threads_added;
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unsigned int threads_removed;
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Log::Context log_context;
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Log::Context::Wrapper log_wrap; // must be constructed after log_context
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Mutex mutex;
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Mutex log_mutex;
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bool halt;
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};
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}
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#endif
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