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