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     if (!sc)
  59         return;         // connection not existing, so no hello
  60
  61     std::ostringstream hello;
  62
  63     hello << "T2Nv" << PROTOCOL_VERSION << ';';
  64
  65     int byteordercheck=1;
  66     hello.write((char*)&byteordercheck,sizeof(byteordercheck));
  67
  68     hello << ';';
  69
  70     sc->write(hello.str());
  71 }
  72
  73 /// handle a command including deserialization and answering
  74 void command_server::handle_packet(const std::string& packet, server_connection* conn)
  75 {
  76     OBJLOGSTREAM(s,debug,"handling packet from connection " << conn->get_id());
  77
  78     // deserialize packet
  79     std::istringstream ifs(packet);
  80     boost::archive::binary_iarchive ia(ifs);
  81     command_container ccont;
  82     result_container res;
  83
  84     try
  85     {
  86         ia >> ccont;
  87     }
  88     catch(boost::archive::archive_exception &e)
  89     {
  90         std::ostringstream msg;
  91         msg << "archive_exception while deserializing on server-side, "
  92                "code " << e.code << " (" << e.what() << ")";
  93         res.set_exception(new t2n_serialization_error(msg.str()));
  94     }
  95     catch(...)
  96         { throw; }
  97
  98     if (!res.has_exception())
  99     {
 100         std::ostream* ostr;
 101         if ((ostr=s.get_logstream(fulldebug))!=NULL)
 102         {
 103             (*ostr) << "decoded packet data: " << std::endl;
 104             boost::archive::xml_oarchive xo(*ostr);
 105             xo << BOOST_SERIALIZATION_NVP(ccont);
 106         }
 107
 108         command* cmd=cast_command(ccont.get_command());
 109
 110         if (cmd)
 111         {
 112             try
 113             {
 114                 res.set_result((*cmd)());
 115             }
 116             catch (t2n_exception &e)
 117                 { res.set_exception(e.clone()); }
 118             catch (...)
 119                 { throw; }
 120         }
 121         else
 122         {
 123             std::ostringstream msg;
 124             if (ccont.get_command()!=NULL)
 125                 msg << "illegal command of type " << typeid(ccont.get_command()).name() << " called";
 126             else
 127                 msg << "NULL command called";
 128             res.set_exception(new t2n_command_error(msg.str()));
 129         }
 130     }
 131
 132     std::ostringstream ofs;
 133     boost::archive::binary_oarchive oa(ofs);
 134
 135     try
 136     {
 137         oa << res;
 138     }
 139     catch(boost::archive::archive_exception &e)
 140     {
 141         std::ostringstream msg;
 142         msg << "archive_exception while serializing on server-side, "
 143                "code " << e.code << " (" << e.what() << ")";
 144         res.set_exception(new t2n_serialization_error(msg.str()));
 145         oa << res;
 146     }
 147     catch(...)
 148         { throw; }
 149
 150     std::ostream* ostr;
 151     if ((ostr=s.get_logstream(fulldebug))!=NULL)
 152     {
 153         (*ostr) << "returning result, decoded data: " << std::endl;
 154         boost::archive::xml_oarchive xo(*ostr);
 155         xo << BOOST_SERIALIZATION_NVP(res);
 156     }
 157
 158     conn->write(ofs.str());
 159 }
 160
 161 /** @brief handle incoming commands
 162     @param[in,out] usec_timeout wait until new data is found, max timeout usecs.
 163             -1: wait endless, 0: instant return
 164     @param[out] usec_timeout_remaining microseconds from the timeout that were not used
 165 */
 166 void command_server::handle(long long usec_timeout, long long* usec_timeout_remaining)
 167 {
 168     guard_handle++;
 169     try
 170     {
 171         if (s.fill_buffer(usec_timeout,usec_timeout_remaining))
 172         {
 173             std::string packet;
 174             unsigned int conn_id;
 175
 176             while (s.get_packet(packet,conn_id))
 177             {
 178                 server_connection* conn=s.get_connection(conn_id);
 179                 if (!conn)
 180                     EXCEPTIONSTREAM(error,logic_error,"illegal connection id " << conn_id << " received");
 181
 182                 try
 183                     { handle_packet(packet,conn); }
 184                 catch (t2n_transfer_error &e)
 185                 {
 186                     // shut down a connection with transfer errors (usually write errors)
 187                     conn->close();
 188                 }
 189                 catch(...)
 190                     { throw; }
 191             }
 192         }
 193     }
 194     catch(...)
 195     {
 196         guard_handle--;
 197         throw;
 198     }
 199     guard_handle--;
 200
 201     // don't call cleanup on re-entered handle-calls
 202     if (guard_handle == 0)
 203         s.cleanup();
 204 }
 205
 206 }