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

   1 /***************************************************************************
   2  *   Copyright (C) 2008 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 <functional>
  21 #include <string>
  22
  23 #include <socket_wrapper.hxx>
  24
  25 namespace libt2n
  26 {
  27
  28 client_connection* BasicSocketWrapper::get_connection(void)
  29 {
  30     if (c.get() == NULL)
  31     {
  32         if (socket_type == tcp_s)
  33             c=std::auto_ptr<socket_client_connection>
  34                 (new socket_client_connection(port,server,connect_timeout_usec,max_retries,logstream,log_level));
  35         else if (socket_type == unix_s)
  36             c=std::auto_ptr<socket_client_connection>
  37                 (new socket_client_connection(path,connect_timeout_usec,max_retries,logstream,log_level));
  38     }
  39
  40     return c.get();
  41 }
  42
  43 bool ReconnectSocketWrapper::handle(command_client* stubBase, boost::function< void() > f)
  44 {
  45     int tries=0;
  46
  47     while(true)
  48     {
  49         try
  50         {
  51             // we always reconnect if something went wrong before:
  52             // makes sure the buffers are clean of half-sent packets etc.
  53             if (tries > 0)
  54                 c->reconnect();
  55
  56             f();
  57             // we were successful
  58             return true;
  59         }
  60         catch(t2n_connect_error &e)
  61         {
  62             // reconnect already tries max_tries times to reconnect: we are done if that failed
  63             throw(e);
  64         }
  65         catch(t2n_communication_error &e)
  66         {
  67             // aborts the loop with an exception after max_retries iterations
  68             // retries means that the first try doesn't count: use >
  69             if (tries > max_retries)
  70                 throw(e);
  71
  72             // otherwise ignore the exception and reconnect in the next iteration
  73         }
  74         catch(...)
  75         {
  76             throw;
  77         }
  78
  79         tries++;
  80     }
  81
  82     return false;
  83 }
  84
  85 client_connection* ReconnectIgnoreFailureSocketWrapper::get_connection(void)
  86 {
  87     client_connection* tmp=BasicSocketWrapper::get_connection();
  88
  89     if (tmp->is_closed())
  90     {
  91         // throw away the closed connection...
  92         c.reset();
  93         // ...return the dummy one instead
  94         tmp=&dc;
  95     }
  96
  97     return tmp;
  98 }
  99
 100 bool ReconnectIgnoreFailureSocketWrapper::handle(command_client* stubBase, boost::function< void() > f)
 101 {
 102     if (!connection_established())
 103     {
 104         // dummy connection is in place: try to establish a real one
 105         client_connection* tmp=get_connection();
 106
 107         if (tmp != &dc)
 108         {
 109             // success! we've got a real connection
 110             stubBase->replace_connection(tmp);
 111         }
 112     }
 113
 114     // only try to handle the call if we've got a real connection
 115     if (connection_established())
 116     {
 117         try
 118         {
 119             ReconnectSocketWrapper::handle(stubBase,f);
 120             return true;
 121         }
 122         catch(t2n_communication_error &e)
 123         {
 124             // ignore
 125         }
 126         catch(...)
 127         {
 128             throw;
 129         }
 130     }
 131
 132     return false;
 133 }
 134
 135 }