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), guard_handle(0)
  48 {
  49     // register callback
  50     s.add_callback(new_connection,bind(&command_server::send_hello, boost::ref(*this), _1));
  51 }
  52
  53 /// send a hello message to a new connection
  54 void command_server::send_hello(unsigned int conn_id)
  55 {
  56     server_connection* sc=s.get_connection(conn_id);
  57
  58     std::ostringstream hello;
  59
  60     hello << "T2Nv" << PROTOCOL_VERSION << ';';
  61
  62     int byteordercheck=1;
  63     hello.write((char*)&byteordercheck,sizeof(byteordercheck));
  64
  65     hello << ';';
  66
  67     sc->write(hello.str());
  68 }
  69
  70 /// handle a command including deserialization and answering
  71 void command_server::handle_packet(const std::string& packet, server_connection* conn)
  72 {
  73     OBJLOGSTREAM(s,debug,"handling packet from connection " << conn->get_id());
  74
  75     // deserialize packet
  76     std::istringstream ifs(packet);
  77     boost::archive::binary_iarchive ia(ifs);
  78     command_container ccont;
  79     result_container res;
  80
  81     try
  82     {
  83         ia >> ccont;
  84     }
  85     catch(boost::archive::archive_exception &e)
  86     {
  87         std::ostringstream msg;
  88         msg << "archive_exception while deserializing on server-side, "
  89                "code " << e.code << " (" << e.what() << ")";
  90         res.set_exception(new t2n_serialization_error(msg.str()));
  91     }
  92     catch(...)
  93         { throw; }
  94
  95     if (!res.has_exception())
  96     {
  97         std::ostream* ostr;
  98         if ((ostr=s.get_logstream(fulldebug))!=NULL)
  99         {
 100             (*ostr) << "decoded packet data: " << std::endl;
 101             boost::archive::xml_oarchive xo(*ostr);
 102             xo << BOOST_SERIALIZATION_NVP(ccont);
 103         }
 104
 105         command* cmd=cast_command(ccont.get_command());
 106
 107         if (cmd)
 108         {
 109             try
 110             {
 111                 res.set_result((*cmd)());
 112             }
 113             catch (t2n_exception &e)
 114                 { res.set_exception(e.clone()); }
 115             catch (...)
 116                 { throw; }
 117         }
 118         else
 119         {
 120             std::ostringstream msg;
 121             if (ccont.get_command()!=NULL)
 122                 msg << "illegal command of type " << typeid(ccont.get_command()).name() << " called";
 123             else
 124                 msg << "NULL command called";
 125             res.set_exception(new t2n_command_error(msg.str()));
 126         }
 127     }
 128
 129     std::ostringstream ofs;
 130     boost::archive::binary_oarchive oa(ofs);
 131
 132     try
 133     {
 134         oa << res;
 135     }
 136     catch(boost::archive::archive_exception &e)
 137     {
 138         std::ostringstream msg;
 139         msg << "archive_exception while serializing on server-side, "
 140                "code " << e.code << " (" << e.what() << ")";
 141         res.set_exception(new t2n_serialization_error(msg.str()));
 142         oa << res;
 143     }
 144     catch(...)
 145         { throw; }
 146
 147     std::ostream* ostr;
 148     if ((ostr=s.get_logstream(fulldebug))!=NULL)
 149     {
 150         (*ostr) << "returning result, decoded data: " << std::endl;
 151         boost::archive::xml_oarchive xo(*ostr);
 152         xo << BOOST_SERIALIZATION_NVP(res);
 153     }
 154
 155     conn->write(ofs.str());
 156 }
 157
 158 /** @brief handle incoming commands
 159     @param[in,out] usec_timeout wait until new data is found, max timeout usecs.
 160             -1: wait endless, 0: instant return
 161 */
 162 void command_server::handle(long long usec_timeout, long long* usec_timeout_remaining)
 163 {
 164     guard_handle++;
 165     try
 166     {
 167         if (s.fill_buffer(usec_timeout,usec_timeout_remaining))
 168         {
 169             std::string packet;
 170             unsigned int conn_id;
 171
 172             while (s.get_packet(packet,conn_id))
 173             {
 174                 server_connection* conn=s.get_connection(conn_id);
 175                 if (!conn)
 176                     EXCEPTIONSTREAM(error,logic_error,"illegal connection id " << conn_id << " received");
 177
 178                 try
 179                     { handle_packet(packet,conn); }
 180                 catch (t2n_transfer_error &e)
 181                 {
 182                     // shut down a connection with transfer errors (usually write errors)
 183                     conn->close();
 184                 }
 185                 catch(...)
 186                     { throw; }
 187             }
 188         }
 189     }
 190     catch(...)
 191     {
 192         guard_handle--;
 193         throw;
 194     }
 195     guard_handle--;
 196
 197     // don't call cleanup on re-entered handle-calls
 198     if (guard_handle == 0)
 199         s.cleanup();
 200 }
 201
 202 }