1 /***************************************************************************
2 * Copyright (C) 2006 by Gerd v. Egidy *
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. *
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. *
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 ***************************************************************************/
24 #include <netinet/in.h>
26 #include "connection.hxx"
31 connection::~connection()
33 // we want the connection_closed callbacks to be called before
36 do_callbacks(connection_deleted);
39 void connection::close()
44 do_callbacks(connection_closed);
48 connection::packet_size_indicator connection::bytes_available()
50 // no size information -> no packet
51 if (buffer.size() < sizeof(packet_size_indicator))
54 packet_size_indicator psize=ntohl(*((packet_size_indicator*)(buffer.data())));
56 // enough data for one packet in buffer?
57 if (buffer.size() < sizeof(packet_size_indicator)+psize)
60 // ok, full packet there
64 /** @brief read a complete data packet from the buffer. The packet is removed from the
66 @param[out] data the data package
67 @retval true if packet found
69 bool connection::get_packet(std::string& data)
71 packet_size_indicator psize;
73 if ((psize=bytes_available()))
75 data.assign(buffer,sizeof(packet_size_indicator),psize);
76 buffer.erase(0,sizeof(packet_size_indicator)+psize);
83 /** @brief get (maybe incomplete) data of the next packet from the buffer. Does not remove the data
84 from the connection buffer.
85 @param[out] data the data package
86 @retval full size of the packet when it will be complete
88 unsigned int connection::peek_packet(std::string& data)
90 // no size information -> no packet
91 if (buffer.size() < sizeof(packet_size_indicator))
94 packet_size_indicator psize=ntohl(*((packet_size_indicator*)(buffer.data())));
96 // not the full data available?
97 packet_size_indicator currsize=psize;
98 if (buffer.size() < currsize+sizeof(packet_size_indicator))
99 currsize=buffer.size()-sizeof(packet_size_indicator);
101 data.assign(buffer,sizeof(packet_size_indicator),currsize);
106 /// send a blob to the peer
107 void connection::write(const std::string& data)
109 // prepend packet size to data
110 packet_size_indicator psize=htonl(data.size());
111 std::string send_data(data);
112 send_data.insert(0,(char*)&psize,sizeof(packet_size_indicator));
114 real_write(send_data);
117 /** @brief add a callback
119 @param event event the function will be called at
120 @param func functor (see boost function) that will be called
122 @note use boost::bind to bind to member functions and parameters like this:
123 17 is a fixed parameter that is always added to the call
124 c.add_callback(connection_closed,bind(&my_class::func_to_call_back, boost::ref(*this), 17));
126 void connection::add_callback(callback_event_type event, const boost::function<void ()>& func)
128 if (event == new_connection)
129 throw std::logic_error("new_connection callback not allowed for server_connections");
131 callbacks[event].push_back(func);
134 /** @brief an event has occured, execute the callbacks that are registered for this event
136 @param event event type that has occured
138 void connection::do_callbacks(callback_event_type event)
140 std::list<boost::function<void ()> >::iterator i,ie=callbacks[event].end();
141 for (i=callbacks[event].begin(); i != ie; i++)
145 /** @brief get the callbacks in place for one event
147 @param event event the callbacks should be registered for
148 @return std::list of functors (boost::function) with the callbacks
150 @note if you want to get the callbacks for all events, loop from 0 to __events_end
152 std::list<boost::function<void ()> > connection::get_callback_list(callback_event_type event)
154 return callbacks[event];