X-Git-Url: http://developer.intra2net.com/git/?p=libt2n;a=blobdiff_plain;f=src%2Fconnection.cpp;h=30a0b19246dae9e4f277f561f135b00800457999;hp=0b445ef1a42d24d9dd85a31b5d090b4a69484071;hb=af84dfb53a739a0c8c343d9172f1847fa908906d;hpb=a11e19b7adab2d5b937573701959562f06087ac5

diff --git a/src/connection.cpp b/src/connection.cpp
index 0b445ef..30a0b19 100644
--- a/src/connection.cpp
+++ b/src/connection.cpp
@@ -19,54 +19,190 @@
 
 #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);
+}
 
 }