2 * Copyright (c) 2011 Sveriges Television AB <info@casparcg.com>
4 * This file is part of CasparCG (www.casparcg.com).
6 * CasparCG is free software: you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation, either version 3 of the License, or
9 * (at your option) any later version.
11 * CasparCG is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with CasparCG. If not, see <http://www.gnu.org/licenses/>.
19 * Author: Robert Nagy, ronag89@gmail.com
22 #include "../StdAfx.h"
24 #include "AsyncEventServer.h"
33 #include <boost/asio.hpp>
34 #include <boost/lexical_cast.hpp>
36 #include <tbb/mutex.h>
37 #include <tbb/concurrent_hash_map.h>
38 #include <tbb/concurrent_queue.h>
40 using boost::asio::ip::tcp;
42 namespace caspar { namespace IO {
46 typedef std::set<spl::shared_ptr<connection>> connection_set;
48 class connection : public spl::enable_shared_from_this<connection>
50 typedef tbb::concurrent_hash_map<std::wstring, std::shared_ptr<void>> lifecycle_map_type;
51 typedef tbb::concurrent_queue<std::string> send_queue;
53 const spl::shared_ptr<tcp::socket> socket_;
54 std::shared_ptr<boost::asio::io_service> service_;
55 const std::wstring listen_port_;
56 const spl::shared_ptr<connection_set> connection_set_;
57 protocol_strategy_factory<char>::ptr protocol_factory_;
58 std::shared_ptr<protocol_strategy<char>> protocol_;
60 std::array<char, 32768> data_;
61 lifecycle_map_type lifecycle_bound_objects_;
62 send_queue send_queue_;
65 class connection_holder : public client_connection<char>
67 std::weak_ptr<connection> connection_;
69 explicit connection_holder(std::weak_ptr<connection> conn) : connection_(std::move(conn))
72 void send(std::basic_string<char>&& data) override
74 auto conn = connection_.lock();
77 conn->send(std::move(data));
80 void disconnect() override
82 auto conn = connection_.lock();
88 std::wstring address() const override
90 auto conn = connection_.lock();
93 return conn->ipv4_address();
95 return L"[destroyed-connection]";
98 void add_lifecycle_bound_object(const std::wstring& key, const std::shared_ptr<void>& lifecycle_bound) override
100 auto conn = connection_.lock();
103 return conn->add_lifecycle_bound_object(key, lifecycle_bound);
106 std::shared_ptr<void> remove_lifecycle_bound_object(const std::wstring& key) override
108 auto conn = connection_.lock();
111 return conn->remove_lifecycle_bound_object(key);
113 return std::shared_ptr<void>();
118 static spl::shared_ptr<connection> create(std::shared_ptr<boost::asio::io_service> service, spl::shared_ptr<tcp::socket> socket, const protocol_strategy_factory<char>::ptr& protocol, spl::shared_ptr<connection_set> connection_set)
120 spl::shared_ptr<connection> con(new connection(std::move(service), std::move(socket), std::move(protocol), std::move(connection_set)));
128 protocol_ = protocol_factory_->create(spl::make_shared<connection_holder>(shared_from_this()));
133 CASPAR_LOG(debug) << print() << L" connection destroyed.";
136 std::wstring print() const
138 return L"async_event_server[:" + listen_port_ + L"]";
141 std::wstring address() const
143 return u16(socket_->local_endpoint().address().to_string());
146 std::wstring ipv4_address() const
148 return socket_->is_open() ? u16(socket_->remote_endpoint().address().to_string()) : L"no-address";
151 void send(std::string&& data)
153 send_queue_.push(std::move(data));
154 auto self = shared_from_this();
155 service_->dispatch([=] { self->do_write(); });
160 auto self = shared_from_this();
161 service_->dispatch([=] { self->stop(); });
164 void add_lifecycle_bound_object(const std::wstring& key, const std::shared_ptr<void>& lifecycle_bound)
166 //thread-safe tbb_concurrent_hash_map
167 lifecycle_bound_objects_.insert(std::pair<std::wstring, std::shared_ptr<void>>(key, lifecycle_bound));
169 std::shared_ptr<void> remove_lifecycle_bound_object(const std::wstring& key)
171 //thread-safe tbb_concurrent_hash_map
172 lifecycle_map_type::const_accessor acc;
173 if(lifecycle_bound_objects_.find(acc, key))
175 auto result = acc->second;
176 lifecycle_bound_objects_.erase(acc);
179 return std::shared_ptr<void>();
183 void do_write() //always called from the asio-service-thread
188 if(send_queue_.try_pop(data))
190 write_some(std::move(data));
195 void stop() //always called from the asio-service-thread
197 connection_set_->erase(shared_from_this());
199 CASPAR_LOG(info) << print() << L" Client " << ipv4_address() << L" disconnected (" << connection_set_->size() << L" connections).";
208 CASPAR_LOG_CURRENT_EXCEPTION();
212 connection(const std::shared_ptr<boost::asio::io_service>& service, const spl::shared_ptr<tcp::socket>& socket, const protocol_strategy_factory<char>::ptr& protocol_factory, const spl::shared_ptr<connection_set>& connection_set)
215 , listen_port_(socket_->is_open() ? boost::lexical_cast<std::wstring>(socket_->local_endpoint().port()) : L"no-port")
216 , connection_set_(connection_set)
217 , protocol_factory_(protocol_factory)
220 CASPAR_LOG(info) << print() << L" Accepted connection from " << ipv4_address() << L" (" << (connection_set_->size() + 1) << L" connections).";
223 void handle_read(const boost::system::error_code& error, size_t bytes_transferred) //always called from the asio-service-thread
229 std::string data(data_.begin(), data_.begin() + bytes_transferred);
231 protocol_->parse(data);
235 CASPAR_LOG_CURRENT_EXCEPTION();
240 else if (error != boost::asio::error::operation_aborted)
244 void handle_write(const spl::shared_ptr<std::string>& str, const boost::system::error_code& error, size_t bytes_transferred) //always called from the asio-service-thread
248 if(bytes_transferred != str->size())
250 str->assign(str->substr(bytes_transferred));
251 socket_->async_write_some(boost::asio::buffer(str->data(), str->size()), std::bind(&connection::handle_write, shared_from_this(), str, std::placeholders::_1, std::placeholders::_2));
259 else if (error != boost::asio::error::operation_aborted && socket_->is_open())
263 void read_some() //always called from the asio-service-thread
265 socket_->async_read_some(boost::asio::buffer(data_.data(), data_.size()), std::bind(&connection::handle_read, shared_from_this(), std::placeholders::_1, std::placeholders::_2));
268 void write_some(std::string&& data) //always called from the asio-service-thread
271 auto str = spl::make_shared<std::string>(std::move(data));
272 socket_->async_write_some(boost::asio::buffer(str->data(), str->size()), std::bind(&connection::handle_write, shared_from_this(), str, std::placeholders::_1, std::placeholders::_2));
275 friend struct AsyncEventServer::implementation;
278 struct AsyncEventServer::implementation : public spl::enable_shared_from_this<implementation>
280 std::shared_ptr<boost::asio::io_service> service_;
281 tcp::acceptor acceptor_;
282 protocol_strategy_factory<char>::ptr protocol_factory_;
283 spl::shared_ptr<connection_set> connection_set_;
284 std::vector<lifecycle_factory_t> lifecycle_factories_;
287 implementation(std::shared_ptr<boost::asio::io_service> service, const protocol_strategy_factory<char>::ptr& protocol, unsigned short port)
288 : service_(std::move(service))
289 , acceptor_(*service_, tcp::endpoint(tcp::v4(), port))
290 , protocol_factory_(protocol)
303 CASPAR_LOG_CURRENT_EXCEPTION();
309 auto conns_set = connection_set_;
311 service_->post([conns_set]
313 auto connections = *conns_set;
314 for (auto& connection : connections)
321 spl::shared_ptr<tcp::socket> socket(new tcp::socket(*service_));
322 acceptor_.async_accept(*socket, std::bind(&implementation::handle_accept, shared_from_this(), socket, std::placeholders::_1));
325 void handle_accept(const spl::shared_ptr<tcp::socket>& socket, const boost::system::error_code& error)
327 if (!acceptor_.is_open())
332 boost::system::error_code ec;
333 socket->set_option(boost::asio::socket_base::keep_alive(true), ec);
336 CASPAR_LOG(warning) << print() << L" Failed to enable TCP keep-alive on socket";
338 auto conn = connection::create(service_, socket, protocol_factory_, connection_set_);
339 connection_set_->insert(conn);
341 for (auto& lifecycle_factory : lifecycle_factories_)
343 auto lifecycle_bound = lifecycle_factory(u8(conn->ipv4_address()));
344 conn->add_lifecycle_bound_object(lifecycle_bound.first, lifecycle_bound.second);
350 std::wstring print() const
352 return L"async_event_server[:" + boost::lexical_cast<std::wstring>(acceptor_.local_endpoint().port()) + L"]";
355 void add_client_lifecycle_object_factory(const lifecycle_factory_t& factory)
357 auto self = shared_from_this();
358 service_->post([=]{ self->lifecycle_factories_.push_back(factory); });
362 AsyncEventServer::AsyncEventServer(
363 std::shared_ptr<boost::asio::io_service> service, const protocol_strategy_factory<char>::ptr& protocol, unsigned short port)
364 : impl_(new implementation(std::move(service), protocol, port))
366 impl_->start_accept();
369 AsyncEventServer::~AsyncEventServer()
374 void AsyncEventServer::add_client_lifecycle_object_factory(const lifecycle_factory_t& factory) { impl_->add_client_lifecycle_object_factory(factory); }