| 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 | @param[out] usec_timeout_remaining microseconds from the timeout that were not used |
| 162 | */ |
| 163 | void command_server::handle(long long usec_timeout, long long* usec_timeout_remaining) |
| 164 | { |
| 165 | guard_handle++; |
| 166 | try |
| 167 | { |
| 168 | if (s.fill_buffer(usec_timeout,usec_timeout_remaining)) |
| 169 | { |
| 170 | std::string packet; |
| 171 | unsigned int conn_id; |
| 172 | |
| 173 | while (s.get_packet(packet,conn_id)) |
| 174 | { |
| 175 | server_connection* conn=s.get_connection(conn_id); |
| 176 | if (!conn) |
| 177 | EXCEPTIONSTREAM(error,logic_error,"illegal connection id " << conn_id << " received"); |
| 178 | |
| 179 | try |
| 180 | { handle_packet(packet,conn); } |
| 181 | catch (t2n_transfer_error &e) |
| 182 | { |
| 183 | // shut down a connection with transfer errors (usually write errors) |
| 184 | conn->close(); |
| 185 | } |
| 186 | catch(...) |
| 187 | { throw; } |
| 188 | } |
| 189 | } |
| 190 | } |
| 191 | catch(...) |
| 192 | { |
| 193 | guard_handle--; |
| 194 | throw; |
| 195 | } |
| 196 | guard_handle--; |
| 197 | |
| 198 | // don't call cleanup on re-entered handle-calls |
| 199 | if (guard_handle == 0) |
| 200 | s.cleanup(); |
| 201 | } |
| 202 | |
| 203 | } |