git.sesse.net Git - casparcg/blob - protocol/util/AsyncEventServer.cpp

   1 /*
   2 * Copyright (c) 2011 Sveriges Television AB <info@casparcg.com>
   3 *
   4 * This file is part of CasparCG (www.casparcg.com).
   5 *
   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.
  10 *
  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.
  15 *
  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/>.
  18 *
  19 * Author: Robert Nagy, ronag89@gmail.com
  20 */
  21
  22 #include "../StdAfx.h"
  23
  24 #include "AsyncEventServer.h"
  25
  26 #include <algorithm>
  27 #include <array>
  28 #include <string>
  29 #include <set>
  30 #include <memory>
  31 #include <functional>
  32
  33 #include <boost/asio.hpp>
  34 #include <boost/lexical_cast.hpp>
  35
  36 #include <tbb/mutex.h>
  37 #include <tbb/concurrent_hash_map.h>
  38 #include <tbb/concurrent_queue.h>
  39
  40 using boost::asio::ip::tcp;
  41
  42 namespace caspar { namespace IO {
  43
  44 class connection;
  45
  46 typedef std::set<spl::shared_ptr<connection>> connection_set;
  47
  48 class connection : public spl::enable_shared_from_this<connection>
  49 {
  50         typedef tbb::concurrent_hash_map<std::wstring, std::shared_ptr<void>> lifecycle_map_type;
  51         typedef tbb::concurrent_queue<std::string>      send_queue;
  52
  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_;
  59
  60         std::array<char, 32768>                                                 data_;
  61         lifecycle_map_type                                                              lifecycle_bound_objects_;
  62         send_queue                                                                              send_queue_;
  63         bool                                                                                    is_writing_;
  64
  65         class connection_holder : public client_connection<char>
  66         {
  67                 std::weak_ptr<connection> connection_;
  68         public:
  69                 explicit connection_holder(std::weak_ptr<connection> conn) : connection_(std::move(conn))
  70                 {}
  71
  72                 void send(std::basic_string<char>&& data) override
  73                 {
  74                         auto conn = connection_.lock();
  75
  76                         if (conn)
  77                                 conn->send(std::move(data));
  78                 }
  79
  80                 void disconnect() override
  81                 {
  82                         auto conn = connection_.lock();
  83
  84                         if (conn)
  85                                 conn->disconnect();
  86                 }
  87
  88                 std::wstring address() const override
  89                 {
  90                         auto conn = connection_.lock();
  91
  92                         if (conn)
  93                                 return conn->ipv4_address();
  94                         else
  95                                 return L"[destroyed-connection]";
  96                 }
  97
  98                 void add_lifecycle_bound_object(const std::wstring& key, const std::shared_ptr<void>& lifecycle_bound) override
  99                 {
 100                         auto conn = connection_.lock();
 101
 102                         if (conn)
 103                                 return conn->add_lifecycle_bound_object(key, lifecycle_bound);
 104                 }
 105
 106                 std::shared_ptr<void> remove_lifecycle_bound_object(const std::wstring& key) override
 107                 {
 108                         auto conn = connection_.lock();
 109
 110                         if (conn)
 111                                 return conn->remove_lifecycle_bound_object(key);
 112                         else
 113                                 return std::shared_ptr<void>();
 114                 }
 115         };
 116
 117 public:
 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)
 119         {
 120                 spl::shared_ptr<connection> con(new connection(std::move(service), std::move(socket), std::move(protocol), std::move(connection_set)));
 121                 con->read_some();
 122                 return con;
 123     }
 124
 125         ~connection()
 126         {
 127                 CASPAR_LOG(info) << print() << L" connection destroyed.";
 128         }
 129
 130         std::wstring print() const
 131         {
 132                 return L"async_event_server[:" + listen_port_ + L"]";
 133         }
 134
 135         std::wstring address() const
 136         {
 137                 return u16(socket_->local_endpoint().address().to_string());
 138         }
 139
 140         std::wstring ipv4_address() const
 141         {
 142                 return socket_->is_open() ? u16(socket_->remote_endpoint().address().to_string()) : L"no-address";
 143         }
 144
 145         void send(std::string&& data)
 146         {
 147                 send_queue_.push(std::move(data));
 148                 auto self = shared_from_this();
 149                 service_->dispatch([=] { self->do_write(); });
 150         }
 151
 152         void disconnect()
 153         {
 154                 auto self = shared_from_this();
 155                 service_->dispatch([=] { self->stop(); });
 156         }
 157
 158         void add_lifecycle_bound_object(const std::wstring& key, const std::shared_ptr<void>& lifecycle_bound)
 159         {
 160                 //thread-safe tbb_concurrent_hash_map
 161                 lifecycle_bound_objects_.insert(std::pair<std::wstring, std::shared_ptr<void>>(key, lifecycle_bound));
 162         }
 163         std::shared_ptr<void> remove_lifecycle_bound_object(const std::wstring& key)
 164         {
 165                 //thread-safe tbb_concurrent_hash_map
 166                 lifecycle_map_type::const_accessor acc;
 167                 if(lifecycle_bound_objects_.find(acc, key))
 168                 {
 169                         auto result = acc->second;
 170                         lifecycle_bound_objects_.erase(acc);
 171                         return result;
 172                 }
 173                 return std::shared_ptr<void>();
 174         }
 175
 176 private:
 177         void do_write() //always called from the asio-service-thread
 178         {
 179                 if(!is_writing_)
 180                 {
 181                         std::string data;
 182                         if(send_queue_.try_pop(data))
 183                         {
 184                                 write_some(std::move(data));
 185                         }
 186                 }
 187         }
 188
 189         void stop()     //always called from the asio-service-thread
 190         {
 191                 connection_set_->erase(shared_from_this());
 192
 193                 CASPAR_LOG(info) << print() << L" Client " << ipv4_address() << L" disconnected (" << connection_set_->size() << L" connections).";
 194
 195                 try
 196                 {
 197                         socket_->cancel();
 198                         socket_->close();
 199                 }
 200                 catch(...)
 201                 {
 202                         CASPAR_LOG_CURRENT_EXCEPTION();
 203                 }
 204         }
 205
 206     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)
 207                 : socket_(socket)
 208                 , service_(service)
 209                 , listen_port_(socket_->is_open() ? boost::lexical_cast<std::wstring>(socket_->local_endpoint().port()) : L"no-port")
 210                 , connection_set_(connection_set)
 211                 , protocol_factory_(protocol_factory)
 212                 , is_writing_(false)
 213         {
 214                 CASPAR_LOG(info) << print() << L" Accepted connection from " << ipv4_address() << L" (" << (connection_set_->size() + 1) << L" connections).";
 215     }
 216
 217         protocol_strategy<char>& protocol()     //always called from the asio-service-thread
 218         {
 219                 if (!protocol_)
 220                         protocol_ = protocol_factory_->create(spl::make_shared<connection_holder>(shared_from_this()));
 221
 222                 return *protocol_;
 223         }
 224
 225     void handle_read(const boost::system::error_code& error, size_t bytes_transferred)  //always called from the asio-service-thread
 226         {
 227                 if(!error)
 228                 {
 229                         try
 230                         {
 231                                 std::string data(data_.begin(), data_.begin() + bytes_transferred);
 232
 233                                 protocol().parse(data);
 234                         }
 235                         catch(...)
 236                         {
 237                                 CASPAR_LOG_CURRENT_EXCEPTION();
 238                         }
 239
 240                         read_some();
 241                 }
 242                 else if (error != boost::asio::error::operation_aborted)
 243                         stop();
 244     }
 245
 246     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
 247         {
 248                 if(!error)
 249                 {
 250                         if(bytes_transferred != str->size())
 251                         {
 252                                 str->assign(str->substr(bytes_transferred));
 253                                 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));
 254                         }
 255                         else
 256                         {
 257                                 is_writing_ = false;
 258                                 do_write();
 259                         }
 260                 }
 261                 else if (error != boost::asio::error::operation_aborted)
 262                         stop();
 263     }
 264
 265         void read_some()        //always called from the asio-service-thread
 266         {
 267                 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         }
 269
 270         void write_some(std::string&& data)     //always called from the asio-service-thread
 271         {
 272                 is_writing_ = true;
 273                 auto str = spl::make_shared<std::string>(std::move(data));
 274                 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         }
 276
 277         friend struct AsyncEventServer::implementation;
 278 };
 279
 280 struct AsyncEventServer::implementation : public spl::enable_shared_from_this<implementation>
 281 {
 282         std::shared_ptr<boost::asio::io_service>        service_;
 283         tcp::acceptor                                                           acceptor_;
 284         protocol_strategy_factory<char>::ptr            protocol_factory_;
 285         spl::shared_ptr<connection_set>                         connection_set_;
 286         std::vector<lifecycle_factory_t>                        lifecycle_factories_;
 287         tbb::mutex                                                                      mutex_;
 288
 289         implementation(std::shared_ptr<boost::asio::io_service> service, const protocol_strategy_factory<char>::ptr& protocol, unsigned short port)
 290                 : service_(std::move(service))
 291                 , acceptor_(*service_, tcp::endpoint(tcp::v4(), port))
 292                 , protocol_factory_(protocol)
 293         {
 294         }
 295
 296         void stop()
 297         {
 298                 try
 299                 {
 300                         acceptor_.cancel();
 301                         acceptor_.close();
 302                 }
 303                 catch (...)
 304                 {
 305                         CASPAR_LOG_CURRENT_EXCEPTION();
 306                 }
 307         }
 308
 309         ~implementation()
 310         {
 311                 auto conns_set = connection_set_;
 312
 313                 service_->post([conns_set]
 314                 {
 315                         auto connections = *conns_set;
 316                         for (auto& connection : connections)
 317                                 connection->stop();
 318                 });
 319         }
 320
 321         void start_accept()
 322         {
 323                 spl::shared_ptr<tcp::socket> socket(new tcp::socket(*service_));
 324                 acceptor_.async_accept(*socket, std::bind(&implementation::handle_accept, shared_from_this(), socket, std::placeholders::_1));
 325     }
 326
 327         void handle_accept(const spl::shared_ptr<tcp::socket>& socket, const boost::system::error_code& error)
 328         {
 329                 if (!acceptor_.is_open())
 330                         return;
 331
 332         if (!error)
 333                 {
 334                         auto conn = connection::create(service_, socket, protocol_factory_, connection_set_);
 335                         connection_set_->insert(conn);
 336
 337                         for (auto& lifecycle_factory : lifecycle_factories_)
 338                         {
 339                                 auto lifecycle_bound = lifecycle_factory(u8(conn->ipv4_address()));
 340                                 conn->add_lifecycle_bound_object(lifecycle_bound.first, lifecycle_bound.second);
 341                         }
 342                 }
 343                 start_accept();
 344     }
 345
 346         void add_client_lifecycle_object_factory(const lifecycle_factory_t& factory)
 347         {
 348                 auto self = shared_from_this();
 349                 service_->post([=]{ self->lifecycle_factories_.push_back(factory); });
 350         }
 351 };
 352
 353 AsyncEventServer::AsyncEventServer(
 354                 std::shared_ptr<boost::asio::io_service> service, const protocol_strategy_factory<char>::ptr& protocol, unsigned short port)
 355         : impl_(new implementation(std::move(service), protocol, port))
 356 {
 357         impl_->start_accept();
 358 }
 359
 360 AsyncEventServer::~AsyncEventServer()
 361 {
 362         impl_->stop();
 363 }
 364
 365 void AsyncEventServer::add_client_lifecycle_object_factory(const lifecycle_factory_t& factory) { impl_->add_client_lifecycle_object_factory(factory); }
 366
 367 }}