developer.intra2net.com Git - libt2n/blob - src/command_server.cpp

   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 <string>
  21 #include <sstream>
  22 #include <stdexcept>
  23 #include <iostream>
  24
  25 #include <boost/archive/binary_oarchive.hpp>
  26 #include <boost/archive/binary_iarchive.hpp>
  27 #include <boost/archive/xml_oarchive.hpp>
  28 #include <boost/archive/xml_iarchive.hpp>
  29 #include <boost/serialization/serialization.hpp>
  30
  31 #include <boost/bind.hpp>
  32
  33 #include "command_server.hxx"
  34 #include "container.hxx"
  35 #include "log.hxx"
  36
  37 #ifdef HAVE_CONFIG_H
  38 #include <config.h>
  39 #endif
  40
  41 using namespace std;
  42
  43 namespace libt2n
  44 {
  45
  46 command_server::command_server(server& _s)
  47     : s(_s)
  48 {
  49     // register callback
  50     s.add_callback(new_connection,bind(&command_server::send_hello, boost::ref(*this), _1));
  51 }
  52
  53 void command_server::send_hello(unsigned int conn_id)
  54 {
  55     server_connection* sc=s.get_connection(conn_id);
  56
  57     std::ostringstream hello;
  58
  59     hello << "T2Nv" << PROTOCOL_VERSION << ';';
  60
  61     int byteordercheck=1;
  62     hello.write((char*)&byteordercheck,sizeof(byteordercheck));
  63
  64     hello << ';';
  65
  66     sc->write(hello.str());
  67 }
  68
  69 /// handle a command including deserialization and answering
  70 void command_server::handle_packet(const std::string& packet, server_connection* conn)
  71 {
  72     OBJLOGSTREAM(s,debug,"handling packet from connection " << conn->get_id());
  73
  74     // deserialize packet
  75     std::istringstream ifs(packet);
  76     boost::archive::binary_iarchive ia(ifs);
  77     command_container ccont;
  78     result_container res;
  79
  80     try
  81     {
  82         ia >> ccont;
  83     }
  84     catch(boost::archive::archive_exception &e)
  85     {
  86         std::ostringstream msg;
  87         msg << "archive_exception while deserializing on server-side, "
  88                "code " << e.code << " (" << e.what() << ")";
  89         res.set_exception(new t2n_serialization_error(msg.str()));
  90     }
  91     catch(...)
  92         { throw; }
  93
  94     if (!res.has_exception())
  95     {
  96         std::ostream* ostr;
  97         if ((ostr=s.get_logstream(fulldebug))!=NULL)
  98         {
  99             (*ostr) << "decoded packet data: " << std::endl;
 100             boost::archive::xml_oarchive xo(*ostr);
 101             xo << BOOST_SERIALIZATION_NVP(ccont);
 102         }
 103
 104         command* cmd=cast_command(ccont.get_command());
 105
 106         if (cmd)
 107         {
 108             try
 109             {
 110                 res.set_result((*cmd)());
 111             }
 112             catch (t2n_exception &e)
 113                 { res.set_exception(e.clone()); }
 114             catch (...)
 115                 { throw; }
 116         }
 117         else
 118         {
 119             std::ostringstream msg;
 120             if (ccont.get_command()!=NULL)
 121                 msg << "illegal command of type " << typeid(ccont.get_command()).name() << " called";
 122             else
 123                 msg << "NULL command called";
 124             res.set_exception(new t2n_command_error(msg.str()));
 125         }
 126     }
 127
 128     std::ostringstream ofs;
 129     boost::archive::binary_oarchive oa(ofs);
 130
 131     try
 132     {
 133         oa << res;
 134     }
 135     catch(boost::archive::archive_exception &e)
 136     {
 137         std::ostringstream msg;
 138         msg << "archive_exception while serializing on server-side, "
 139                "code " << e.code << " (" << e.what() << ")";
 140         res.set_exception(new t2n_serialization_error(msg.str()));
 141         oa << res;
 142     }
 143     catch(...)
 144         { throw; }
 145
 146     std::ostream* ostr;
 147     if ((ostr=s.get_logstream(fulldebug))!=NULL)
 148     {
 149         (*ostr) << "returning result, decoded data: " << std::endl;
 150         boost::archive::xml_oarchive xo(*ostr);
 151         xo << BOOST_SERIALIZATION_NVP(res);
 152     }
 153
 154     conn->write(ofs.str());
 155 }
 156
 157 /** @brief handle incoming commands
 158     @param[in,out] usec_timeout wait until new data is found, max timeout usecs.
 159             -1: wait endless, 0: instant return
 160 */
 161 void command_server::handle(long long usec_timeout, long long* usec_timeout_remaining)
 162 {
 163     if (s.fill_buffer(usec_timeout,usec_timeout_remaining))
 164     {
 165         std::string packet;
 166         unsigned int conn_id;
 167
 168         while (s.get_packet(packet,conn_id))
 169             handle_packet(packet,s.get_connection(conn_id));
 170     }
 171     s.cleanup();
 172 }
 173
 174 }