#include <string>
#include <sstream>
+#include <iostream>
+#include <stdexcept>
+
+#include <netinet/in.h>
#include "connection.hxx"
namespace libt2n
{
-connection::packet_size_indicator connection::bytes_available()
+connection::~connection()
{
- // max packet size is unsigned int
+ // we want the connection_closed callbacks to be called before
+ close();
+
+ do_callbacks(connection_deleted);
+}
+void connection::close()
+{
+ if (!is_closed())
+ {
+ closed=true;
+ do_callbacks(connection_closed);
+ }
+}
+
+connection::packet_size_indicator connection::bytes_available()
+{
// no size information -> no packet
- if (buffer.size() < sizeof(unsigned int))
- return false;
+ if (buffer.size() < sizeof(packet_size_indicator))
+ return 0;
- packet_size_indicator psize=*((packet_size_indicator*)(buffer.data()));
+ packet_size_indicator psize=ntohl(*((packet_size_indicator*)(buffer.data())));
// enough data for one packet in buffer?
- if (buffer.size() < sizeof(unsigned int)+psize)
- return false;
+ if (buffer.size() < sizeof(packet_size_indicator)+psize)
+ return 0;
// ok, full packet there
- return true;
+ return psize;
}
+/** @brief read a complete data packet from the buffer. The packet is removed from the
+ connection buffer.
+ @param[out] data the data package
+ @retval true if packet found
+*/
bool connection::get_packet(std::string& data)
{
packet_size_indicator psize;
if ((psize=bytes_available()))
{
- data.assign(buffer,sizeof(unsigned int),psize);
- buffer.erase(0,sizeof(unsigned int)+psize);
+ data.assign(buffer,sizeof(packet_size_indicator),psize);
+ buffer.erase(0,sizeof(packet_size_indicator)+psize);
return true;
}
else
return false;
}
+/** @brief get (maybe incomplete) data of the next packet from the buffer. Does not remove the data
+ from the connection buffer.
+ @param[out] data the data package
+ @retval full size of the packet when it will be complete
+*/
+unsigned int connection::peek_packet(std::string& data)
+{
+ // no size information -> no packet
+ if (buffer.size() < sizeof(packet_size_indicator))
+ return 0;
+
+ packet_size_indicator psize=ntohl(*((packet_size_indicator*)(buffer.data())));
+
+ // not the full data available?
+ packet_size_indicator currsize=psize;
+ if (buffer.size() < currsize+sizeof(packet_size_indicator))
+ currsize=buffer.size()-sizeof(packet_size_indicator);
+
+ data.assign(buffer,sizeof(packet_size_indicator),currsize);
+
+ return psize;
+}
+
+/// remove all data from buffer that is not a complete packet
+void connection::remove_incomplete_packets()
+{
+ std::string::size_type p=0;
+ std::string::size_type end=buffer.size();
+
+ while (p < end)
+ {
+ // not enough space for size information -> no packet
+ if (p+sizeof(packet_size_indicator) > end)
+ break;
+
+ packet_size_indicator psize=ntohl(*((packet_size_indicator*)(buffer.data()+p)));
+
+ if (p+sizeof(packet_size_indicator)+psize > end)
+ {
+ // incomplete packet
+ break;
+ }
+ else
+ {
+ // move p to where the next packet will start
+ p+=sizeof(packet_size_indicator)+psize;
+ }
+ }
+
+ if (p < end)
+ {
+ // incomplete packets there, remove them
+ buffer.erase(p);
+ }
+}
+
+/// send a blob to the peer
void connection::write(const std::string& data)
{
// prepend packet size to data
- packet_size_indicator psize=data.size();
+ packet_size_indicator psize=htonl(data.size());
std::string send_data(data);
- send_data.insert(0,(char*)psize,sizeof(packet_size_indicator));
+ send_data.insert(0,(char*)&psize,sizeof(packet_size_indicator));
real_write(send_data);
}
+/** @brief add a callback
+
+ @param event event the function will be called at
+ @param func functor (see boost function) that will be called
+
+ @note use boost::bind to bind to member functions and parameters like this:
+ 17 is a fixed parameter that is always added to the call
+ c.add_callback(connection_closed,bind(&my_class::func_to_call_back, boost::ref(*this), 17));
+*/
+void connection::add_callback(callback_event_type event, const boost::function<void ()>& func)
+{
+ callbacks[event].push_back(func);
+}
+
+/** @brief an event has occured, execute the callbacks that are registered for this event
+
+ @param event event type that has occured
+*/
+void connection::do_callbacks(callback_event_type event)
+{
+ std::list<boost::function<void ()> >::iterator i,ie=callbacks[event].end();
+ for (i=callbacks[event].begin(); i != ie; i++)
+ (*i)();
+}
+
+/** @brief get the callbacks in place for one event
+
+ @param event event the callbacks should be registered for
+ @return std::list of functors (boost::function) with the callbacks
+
+ @note if you want to get the callbacks for all events, loop from 0 to __events_end
+*/
+std::list<boost::function<void ()> > connection::get_callback_list(callback_event_type event)
+{
+ return callbacks[event];
+}
+
+/** @brief reopen a already closed connection, removes incomplete packets from the buffer
+ @note Only call when the connection is closed.
+
+ @note Justs cares about the data of connection, reconnecting has to be
+ done in a derived class.
+*/
+void connection::reopen()
+{
+ if (!is_closed())
+ throw std::logic_error("connection::reopen() called with connection still open");
+
+ closed=false;
+
+ // incomplete buffer data is worthless with a new connection
+ remove_incomplete_packets();
+
+ do_callbacks(new_connection);
+}
}
git://developer.intra2net.com / libt2n / blobdiff