| 1 | /*************************************************************************** |
| 2 | * Copyright (C) 2006 by Gerd v. Egidy * |
| 3 | * gve@intra2net.com * |
| 4 | * * |
| 5 | * This library is free software; you can redistribute it and/or modify * |
| 6 | * it under the terms of the GNU Lesser General Public License version * |
| 7 | * 2.1 as published by the Free Software Foundation. * |
| 8 | * * |
| 9 | * This library is distributed in the hope that it will be useful, * |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of * |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * |
| 12 | * GNU Lesser General Public License for more details. * |
| 13 | * * |
| 14 | * You should have received a copy of the GNU Lesser General Public * |
| 15 | * License along with this program; if not, write to the * |
| 16 | * Free Software Foundation, Inc., * |
| 17 | * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. * |
| 18 | ***************************************************************************/ |
| 19 | |
| 20 | #include <sstream> |
| 21 | #include <stdexcept> |
| 22 | |
| 23 | #include <boost/bind.hpp> |
| 24 | |
| 25 | #include "server.hxx" |
| 26 | #include "log.hxx" |
| 27 | |
| 28 | namespace libt2n |
| 29 | { |
| 30 | |
| 31 | server_connection::server_connection(int _timeout) |
| 32 | : connection(), callbacks(__events_end) |
| 33 | { |
| 34 | set_timeout(_timeout); |
| 35 | reset_timeout(); |
| 36 | connection_id=0; |
| 37 | my_server=0; |
| 38 | } |
| 39 | |
| 40 | server_connection::~server_connection() |
| 41 | { |
| 42 | // we want the connection_closed callbacks to be called before |
| 43 | close(); |
| 44 | |
| 45 | do_callbacks(connection_deleted); |
| 46 | } |
| 47 | |
| 48 | void server_connection::close() |
| 49 | { |
| 50 | if (!is_closed()) |
| 51 | { |
| 52 | connection::close(); |
| 53 | do_callbacks(connection_closed); |
| 54 | } |
| 55 | } |
| 56 | |
| 57 | /// get pointer to logging stream, returns NULL if no logging needed |
| 58 | std::ostream* server_connection::get_logstream(log_level_values level) |
| 59 | { |
| 60 | if (my_server != NULL) |
| 61 | { |
| 62 | std::ostream* ostr=my_server->get_logstream(level); |
| 63 | if (ostr != NULL) |
| 64 | (*ostr) << "connection " << get_id() << ": "; |
| 65 | return ostr; |
| 66 | } |
| 67 | else |
| 68 | return NULL; |
| 69 | } |
| 70 | |
| 71 | /// check if timeout is expired, close connection if so |
| 72 | void server_connection::check_timeout() |
| 73 | { |
| 74 | if (timeout != -1 && last_action_time+timeout < time(NULL)) |
| 75 | { |
| 76 | LOGSTREAM(debug,"timeout on connection " << connection_id << ", closing"); |
| 77 | this->close(); |
| 78 | } |
| 79 | } |
| 80 | |
| 81 | /// reset the timeout, e.g. if something is received |
| 82 | void server_connection::reset_timeout() |
| 83 | { |
| 84 | last_action_time=time(NULL); |
| 85 | } |
| 86 | |
| 87 | /** @brief add a callback |
| 88 | |
| 89 | @param event event the function will be called at |
| 90 | @param func functor (see boost function) that will be called |
| 91 | |
| 92 | @example use boost::bind to bind to member functions and parameters like this: |
| 93 | 17 is a fixed parameter that is always added to the call |
| 94 | c.add_callback(connection_closed,bind(&my_class::func_to_call_back, boost::ref(*this), 17)); |
| 95 | */ |
| 96 | void server_connection::add_callback(callback_event_type event, const boost::function<void ()>& func) |
| 97 | { |
| 98 | if (event == new_connection) |
| 99 | throw std::logic_error("new_connection callback not allowed for server_connections"); |
| 100 | |
| 101 | callbacks[event].push_back(func); |
| 102 | } |
| 103 | |
| 104 | void server_connection::do_callbacks(callback_event_type event) |
| 105 | { |
| 106 | std::list<boost::function<void ()> >::iterator i,ie=callbacks[event].end(); |
| 107 | for (i=callbacks[event].begin(); i != ie; i++) |
| 108 | (*i)(); |
| 109 | } |
| 110 | |
| 111 | server::server() |
| 112 | : callbacks(__events_end) |
| 113 | { |
| 114 | set_default_timeout(30); |
| 115 | set_logging(NULL,none); |
| 116 | next_id=1; |
| 117 | } |
| 118 | |
| 119 | server::~server() |
| 120 | { |
| 121 | std::map<unsigned int, server_connection*>::iterator ie=connections.end(); |
| 122 | for(std::map<unsigned int, server_connection*>::iterator i=connections.begin(); i != ie; i++) |
| 123 | delete i->second; |
| 124 | } |
| 125 | |
| 126 | /** @brief add a callback |
| 127 | |
| 128 | @param event event the function will be called at |
| 129 | @param func functor (see boost function) that will be called |
| 130 | |
| 131 | @example use boost::bind to bind to member functions like this: |
| 132 | s.add_callback(new_connection,bind(&my_class::func_to_call_back, boost::ref(*this), _1)); |
| 133 | */ |
| 134 | void server::add_callback(callback_event_type event, const boost::function<void (unsigned int)>& func) |
| 135 | { |
| 136 | callbacks[event].push_back(func); |
| 137 | |
| 138 | // add callback to all existing connections |
| 139 | if (event != new_connection) |
| 140 | { |
| 141 | std::map<unsigned int, server_connection*>::iterator ie=connections.end(); |
| 142 | for(std::map<unsigned int, server_connection*>::iterator i=connections.begin(); i != ie; i++) |
| 143 | i->second->add_callback(event,bind(func, i->first)); |
| 144 | } |
| 145 | } |
| 146 | |
| 147 | void server::do_callbacks(callback_event_type event, unsigned int conn_id) |
| 148 | { |
| 149 | std::list<boost::function<void (unsigned int)> >::iterator i,ie=callbacks[event].end(); |
| 150 | for (i=callbacks[event].begin(); i != ie; i++) |
| 151 | (*i)(conn_id); |
| 152 | } |
| 153 | |
| 154 | int server::add_connection(server_connection* newconn) |
| 155 | { |
| 156 | unsigned int cid=next_id++; |
| 157 | newconn->set_id(cid); |
| 158 | newconn->set_server(this); |
| 159 | connections[cid]=newconn; |
| 160 | |
| 161 | // add all callbacks |
| 162 | for(int e=connection_closed; e != __events_end; e++) |
| 163 | { |
| 164 | std::list<boost::function<void (unsigned int)> >::iterator i,ie=callbacks[e].end(); |
| 165 | for (i=callbacks[e].begin(); i != ie; i++) |
| 166 | newconn->add_callback(static_cast<callback_event_type>(e),bind(*i,cid)); |
| 167 | } |
| 168 | |
| 169 | LOGSTREAM(debug,"new connection accepted, id: " << cid); |
| 170 | |
| 171 | do_callbacks(new_connection,cid); |
| 172 | |
| 173 | return cid; |
| 174 | } |
| 175 | |
| 176 | /// activate logging to the given stream. everything above the given level is logged. |
| 177 | void server::set_logging(std::ostream *_logstream, log_level_values _log_level) |
| 178 | { |
| 179 | log_level=_log_level; |
| 180 | logstream=_logstream; |
| 181 | } |
| 182 | |
| 183 | /** |
| 184 | @brief Gets a connection by id |
| 185 | |
| 186 | @param conn_id Connection ID |
| 187 | |
| 188 | @retval Pointer to connection object |
| 189 | */ |
| 190 | server_connection* server::get_connection(unsigned int conn_id) |
| 191 | { |
| 192 | std::map<unsigned int, server_connection*>::iterator p=connections.find(conn_id); |
| 193 | if (p==connections.end()) |
| 194 | return NULL; |
| 195 | else |
| 196 | return p->second; |
| 197 | } |
| 198 | |
| 199 | /// check for timeouts, remove closed connections. don't forget to call this from time to time. |
| 200 | void server::cleanup() |
| 201 | { |
| 202 | std::map<unsigned int, server_connection*>::iterator ie=connections.end(); |
| 203 | for(std::map<unsigned int, server_connection*>::iterator i=connections.begin(); i != ie; i++) |
| 204 | i->second->check_timeout(); |
| 205 | |
| 206 | for(std::map<unsigned int, server_connection*>::iterator i=connections.begin(); i != ie;) |
| 207 | { |
| 208 | if (i->second->is_closed() && !i->second->packet_available()) |
| 209 | { |
| 210 | // closed and no usable data in buffer -> remove |
| 211 | LOGSTREAM(debug,"removing conneciton " << i->first << " because it is closed and no more data waiting"); |
| 212 | |
| 213 | delete i->second; |
| 214 | connections.erase(i); |
| 215 | i=connections.begin(); |
| 216 | ie=connections.end(); |
| 217 | } |
| 218 | else |
| 219 | i++; |
| 220 | } |
| 221 | } |
| 222 | |
| 223 | /** @brief get a complete data packet from any client. The packet is removed from the |
| 224 | connection buffer. |
| 225 | @param[out] data the data package |
| 226 | @param[out] conn_id the connection id we got this packet from |
| 227 | @retval true if packet found |
| 228 | */ |
| 229 | bool server::get_packet(std::string& data, unsigned int& conn_id) |
| 230 | { |
| 231 | // todo: this is somehow unfair: the first connections in the map get checked more |
| 232 | // often than the others and can thus block them out |
| 233 | |
| 234 | std::map<unsigned int, server_connection*>::iterator ie=connections.end(); |
| 235 | for(std::map<unsigned int, server_connection*>::iterator i=connections.begin(); i != ie; i++) |
| 236 | if (i->second->get_packet(data)) |
| 237 | { |
| 238 | LOGSTREAM(debug,"got packet (" << data.size() << " bytes) from connection " << i->first); |
| 239 | |
| 240 | conn_id=i->first; |
| 241 | return true; |
| 242 | } |
| 243 | |
| 244 | return false; |
| 245 | } |
| 246 | |
| 247 | /// get pointer to logging stream, returns NULL if no logging needed |
| 248 | std::ostream* server::get_logstream(log_level_values level) |
| 249 | { |
| 250 | if (logstream && log_level >= level) |
| 251 | return logstream; |
| 252 | else |
| 253 | return NULL; |
| 254 | } |
| 255 | }; |