src/libstack/osrf_stack.c

   1 #include "osrf_stack.h"
   2 #include "osrf_application.h"
   3
   4 osrf_message* _do_client( osrf_app_session*, osrf_message* );
   5 osrf_message* _do_server( osrf_app_session*, osrf_message* );
   6
   7 /* tell osrf_app_session where the stack entry is */
   8 int (*osrf_stack_entry_point) (transport_client*, int)  = &osrf_stack_process;
   9
  10 int osrf_stack_process( transport_client* client, int timeout ) {
  11         if( !client ) return -1;
  12         transport_message* msg = NULL;
  13
  14         while( (msg = client_recv( client, timeout )) ) {
  15                 debug_handler( "Received message from transport code from %s", msg->sender );
  16                 osrf_stack_transport_handler( msg, NULL );
  17                 timeout = 0;
  18         }
  19
  20         return 0;
  21 }
  22
  23
  24
  25 // -----------------------------------------------------------------------------
  26 // Entry point into the stack
  27 // -----------------------------------------------------------------------------
  28 osrfAppSession* osrf_stack_transport_handler( transport_message* msg, char* my_service ) {
  29
  30         if(!msg) return NULL;
  31
  32         debug_handler( "Transport handler received new message \nfrom %s "
  33                         "to %s with body \n\n%s\n", msg->sender, msg->recipient, msg->body );
  34
  35         if( msg->is_error && ! msg->thread ) {
  36                 warning_handler("!! Received jabber layer error for %s ... exiting\n", msg->sender );
  37                 message_free( msg );
  38                 return NULL;
  39         }
  40
  41         if(! msg->thread  && ! msg->is_error ) {
  42                 warning_handler("Received a non-error message with no thread trace... dropping");
  43                 message_free( msg );
  44                 return NULL;
  45         }
  46
  47         osrf_app_session* session = osrf_app_session_find_session( msg->thread );
  48
  49         if( !session && my_service )
  50                 session = osrf_app_server_session_init( msg->thread, my_service, msg->sender);
  51
  52         if( !session ) return NULL;
  53
  54         if(!msg->is_error)
  55                 debug_handler("Session [%s] found or built", session->session_id );
  56
  57         osrf_app_session_set_remote( session, msg->sender );
  58         osrf_message* arr[OSRF_MAX_MSGS_PER_PACKET];
  59         memset(arr, 0, OSRF_MAX_MSGS_PER_PACKET );
  60         int num_msgs = osrf_message_deserialize(msg->body, arr, OSRF_MAX_MSGS_PER_PACKET);
  61
  62         debug_handler( "We received %d messages from %s", num_msgs, msg->sender );
  63
  64         int i;
  65         for( i = 0; i != num_msgs; i++ ) {
  66
  67                 /* if we've received a jabber layer error message (probably talking to
  68                         someone who no longer exists) and we're not talking to the original
  69                         remote id for this server, consider it a redirect and pass it up */
  70                 if(msg->is_error) {
  71                         warning_handler( " !!! Received Jabber layer error message" );
  72
  73                         if(strcmp(session->remote_id,session->orig_remote_id)) {
  74                                 warning_handler( "Treating jabber error as redirect for tt [%d] "
  75                                         "and session [%s]", arr[i]->thread_trace, session->session_id );
  76
  77                                 arr[i]->m_type = STATUS;
  78                                 arr[i]->status_code = OSRF_STATUS_REDIRECTED;
  79
  80                         } else {
  81                                 warning_handler(" * Jabber Error is for top level remote id [%s], no one "
  82                                                 "to send my message too!!!", session->remote_id );
  83                         }
  84                 }
  85
  86                 osrf_stack_message_handler( session, arr[i] );
  87         }
  88
  89         message_free( msg );
  90         debug_handler("after msg delete");
  91
  92         return session;
  93 }
  94
  95 int osrf_stack_message_handler( osrf_app_session* session, osrf_message* msg ) {
  96         if(session == NULL || msg == NULL)
  97                 return 0;
  98
  99         osrf_message* ret_msg = NULL;
 100
 101         if( session->type ==  OSRF_SESSION_CLIENT )
 102                  ret_msg = _do_client( session, msg );
 103         else
 104                 ret_msg= _do_server( session, msg );
 105
 106         if(ret_msg) {
 107                 debug_handler("passing message %d / session %s to app handler",
 108                                 msg->thread_trace, session->session_id );
 109                 osrf_stack_application_handler( session, ret_msg );
 110         } else
 111                 osrf_message_free(msg);
 112
 113         return 1;
 114
 115 }
 116
 117 /** If we return a message, that message should be passed up the stack,
 118   * if we return NULL, we're finished for now...
 119   */
 120 osrf_message* _do_client( osrf_app_session* session, osrf_message* msg ) {
 121         if(session == NULL || msg == NULL)
 122                 return NULL;
 123
 124         osrf_message* new_msg;
 125
 126         if( msg->m_type == STATUS ) {
 127
 128                 switch( msg->status_code ) {
 129
 130                         case OSRF_STATUS_OK:
 131                                 debug_handler("We connected successfully");
 132                                 session->state = OSRF_SESSION_CONNECTED;
 133                                 debug_handler( "State: %x => %s => %d", session, session->session_id, session->state );
 134                                 return NULL;
 135
 136                         case OSRF_STATUS_COMPLETE:
 137                                 osrf_app_session_set_complete( session, msg->thread_trace );
 138                                 return NULL;
 139
 140                         case OSRF_STATUS_CONTINUE:
 141                                 osrf_app_session_request_reset_timeout( session, msg->thread_trace );
 142                                 return NULL;
 143
 144                         case OSRF_STATUS_REDIRECTED:
 145                                 osrf_app_session_reset_remote( session );
 146                                 session->state = OSRF_SESSION_DISCONNECTED;
 147                                 osrf_app_session_request_resend( session, msg->thread_trace );
 148                                 return NULL;
 149
 150                         case OSRF_STATUS_EXPFAILED:
 151                                 osrf_app_session_reset_remote( session );
 152                                 session->state = OSRF_SESSION_DISCONNECTED;
 153                                 /* set the session to 'stateful' then resend */
 154                         //      osrf_app_session_request_resend( session, msg->thread_trace );
 155                                 return NULL;
 156
 157                         case OSRF_STATUS_TIMEOUT:
 158                                 osrf_app_session_reset_remote( session );
 159                                 session->state = OSRF_SESSION_DISCONNECTED;
 160                                 osrf_app_session_request_resend( session, msg->thread_trace );
 161                                 return NULL;
 162
 163
 164                         default:
 165                                 new_msg = osrf_message_init( RESULT, msg->thread_trace, msg->protocol );
 166                                 osrf_message_set_status_info( new_msg,
 167                                                 msg->status_name, msg->status_text, msg->status_code );
 168                                 warning_handler("The stack doesn't know what to do with "
 169                                                 "the provided message code: %d, name %s. Passing UP.",
 170                                                 msg->status_code, msg->status_name );
 171                                 new_msg->is_exception = 1;
 172                                 osrf_app_session_set_complete( session, msg->thread_trace );
 173                                 osrf_message_free(msg);
 174                                 return new_msg;
 175                 }
 176
 177                 return NULL;
 178
 179         } else if( msg->m_type == RESULT )
 180                 return msg;
 181
 182         return NULL;
 183
 184 }
 185
 186
 187 /** If we return a message, that message should be passed up the stack,
 188   * if we return NULL, we're finished for now...
 189   */
 190 osrf_message* _do_server( osrf_app_session* session, osrf_message* msg ) {
 191
 192         if(session == NULL || msg == NULL) return NULL;
 193
 194         debug_handler("Server received message of type %d", msg->m_type );
 195
 196         switch( msg->m_type ) {
 197
 198                 case STATUS:
 199                                 return NULL;
 200
 201                 case DISCONNECT:
 202                                 /* session will be freed by the forker */
 203                                 return NULL;
 204
 205                 case CONNECT:
 206                                 osrfAppSessionStatus( session, OSRF_STATUS_OK,
 207                                                 "osrfConnectStatus", msg->thread_trace, "Connection Successful" );
 208                                 return NULL;
 209
 210                 case REQUEST:
 211
 212                                 debug_handler("server passing message %d to application handler "
 213                                                 "for session %s", msg->thread_trace, session->session_id );
 214                                 return msg;
 215
 216                 default:
 217                         warning_handler("Server cannot handle message of type %d", msg->m_type );
 218                         return NULL;
 219
 220         }
 221 }
 222
 223
 224
 225
 226 int osrf_stack_application_handler( osrf_app_session* session, osrf_message* msg ) {
 227
 228         if(session == NULL || msg == NULL) return 0;
 229
 230         if(msg->m_type == RESULT && session->type == OSRF_SESSION_CLIENT) {
 231                 osrf_app_session_push_queue( session, msg );
 232                 return 1;
 233         }
 234
 235         if(msg->m_type != REQUEST) return 1;
 236
 237         char* method = msg->method_name;
 238         char* app       = session->remote_service;
 239         jsonObject* params = msg->_params;
 240
 241         osrfAppRunMethod( app, method,  session, msg->thread_trace, params );
 242
 243         osrfMessageFree(msg);
 244
 245         return 1;
 246
 247 }
 248