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                 osrfLogDebug( OSRF_LOG_MARK,  "Received message from transport code from %s", msg->sender );
  16                 osrf_stack_transport_handler( msg, NULL );
  17                 timeout = 0;
  18         }
  19
  20         if( ! client_connected( client ) ) return -1;
  21
  22         return 0;
  23 }
  24
  25
  26
  27 // -----------------------------------------------------------------------------
  28 // Entry point into the stack
  29 // -----------------------------------------------------------------------------
  30 osrfAppSession* osrf_stack_transport_handler( transport_message* msg, char* my_service ) {
  31
  32         if(!msg) return NULL;
  33
  34         osrfLogDebug( OSRF_LOG_MARK,  "Transport handler received new message \nfrom %s "
  35                         "to %s with body \n\n%s\n", msg->sender, msg->recipient, msg->body );
  36
  37         if( msg->is_error && ! msg->thread ) {
  38                 osrfLogWarning( OSRF_LOG_MARK, "!! Received jabber layer error for %s ... exiting\n", msg->sender );
  39                 message_free( msg );
  40                 return NULL;
  41         }
  42
  43         if(! msg->thread  && ! msg->is_error ) {
  44                 osrfLogWarning( OSRF_LOG_MARK, "Received a non-error message with no thread trace... dropping");
  45                 message_free( msg );
  46                 return NULL;
  47         }
  48
  49         osrf_app_session* session = osrf_app_session_find_session( msg->thread );
  50
  51         if( !session && my_service )
  52                 session = osrf_app_server_session_init( msg->thread, my_service, msg->sender);
  53
  54         if( !session ) return NULL;
  55
  56         if(!msg->is_error)
  57                 osrfLogDebug( OSRF_LOG_MARK, "Session [%s] found or built", session->session_id );
  58
  59         osrf_app_session_set_remote( session, msg->sender );
  60         osrf_message* arr[OSRF_MAX_MSGS_PER_PACKET];
  61         memset(arr, 0, OSRF_MAX_MSGS_PER_PACKET );
  62         int num_msgs = osrf_message_deserialize(msg->body, arr, OSRF_MAX_MSGS_PER_PACKET);
  63
  64         osrfLogDebug( OSRF_LOG_MARK,  "We received %d messages from %s", num_msgs, msg->sender );
  65
  66         int i;
  67         for( i = 0; i != num_msgs; i++ ) {
  68
  69                 /* if we've received a jabber layer error message (probably talking to
  70                         someone who no longer exists) and we're not talking to the original
  71                         remote id for this server, consider it a redirect and pass it up */
  72                 if(msg->is_error) {
  73                         osrfLogWarning( OSRF_LOG_MARK,  " !!! Received Jabber layer error message" );
  74
  75                         if(strcmp(session->remote_id,session->orig_remote_id)) {
  76                                 osrfLogWarning( OSRF_LOG_MARK,  "Treating jabber error as redirect for tt [%d] "
  77                                         "and session [%s]", arr[i]->thread_trace, session->session_id );
  78
  79                                 arr[i]->m_type = STATUS;
  80                                 arr[i]->status_code = OSRF_STATUS_REDIRECTED;
  81
  82                         } else {
  83                                 osrfLogWarning( OSRF_LOG_MARK, " * Jabber Error is for top level remote id [%s], no one "
  84                                                 "to send my message too!!!", session->remote_id );
  85                         }
  86                 }
  87
  88                 osrf_stack_message_handler( session, arr[i] );
  89         }
  90
  91         message_free( msg );
  92         osrfLogDebug( OSRF_LOG_MARK, "after msg delete");
  93
  94         return session;
  95 }
  96
  97 int osrf_stack_message_handler( osrf_app_session* session, osrf_message* msg ) {
  98         if(session == NULL || msg == NULL)
  99                 return 0;
 100
 101         osrf_message* ret_msg = NULL;
 102
 103         if( session->type ==  OSRF_SESSION_CLIENT )
 104                  ret_msg = _do_client( session, msg );
 105         else
 106                 ret_msg= _do_server( session, msg );
 107
 108         if(ret_msg) {
 109                 osrfLogDebug( OSRF_LOG_MARK, "passing message %d / session %s to app handler",
 110                                 msg->thread_trace, session->session_id );
 111                 osrf_stack_application_handler( session, ret_msg );
 112         } else
 113                 osrf_message_free(msg);
 114
 115         return 1;
 116
 117 }
 118
 119 /** If we return a message, that message should be passed up the stack,
 120   * if we return NULL, we're finished for now...
 121   */
 122 osrf_message* _do_client( osrf_app_session* session, osrf_message* msg ) {
 123         if(session == NULL || msg == NULL)
 124                 return NULL;
 125
 126         osrf_message* new_msg;
 127
 128         if( msg->m_type == STATUS ) {
 129
 130                 switch( msg->status_code ) {
 131
 132                         case OSRF_STATUS_OK:
 133                                 osrfLogDebug( OSRF_LOG_MARK, "We connected successfully");
 134                                 session->state = OSRF_SESSION_CONNECTED;
 135                                 osrfLogDebug( OSRF_LOG_MARK,  "State: %x => %s => %d", session, session->session_id, session->state );
 136                                 return NULL;
 137
 138                         case OSRF_STATUS_COMPLETE:
 139                                 osrf_app_session_set_complete( session, msg->thread_trace );
 140                                 return NULL;
 141
 142                         case OSRF_STATUS_CONTINUE:
 143                                 osrf_app_session_request_reset_timeout( session, msg->thread_trace );
 144                                 return NULL;
 145
 146                         case OSRF_STATUS_REDIRECTED:
 147                                 osrf_app_session_reset_remote( session );
 148                                 session->state = OSRF_SESSION_DISCONNECTED;
 149                                 osrf_app_session_request_resend( session, msg->thread_trace );
 150                                 return NULL;
 151
 152                         case OSRF_STATUS_EXPFAILED:
 153                                 osrf_app_session_reset_remote( session );
 154                                 session->state = OSRF_SESSION_DISCONNECTED;
 155                                 /* set the session to 'stateful' then resend */
 156                         //      osrf_app_session_request_resend( session, msg->thread_trace );
 157                                 return NULL;
 158
 159                         case OSRF_STATUS_TIMEOUT:
 160                                 osrf_app_session_reset_remote( session );
 161                                 session->state = OSRF_SESSION_DISCONNECTED;
 162                                 osrf_app_session_request_resend( session, msg->thread_trace );
 163                                 return NULL;
 164
 165
 166                         default:
 167                                 new_msg = osrf_message_init( RESULT, msg->thread_trace, msg->protocol );
 168                                 osrf_message_set_status_info( new_msg,
 169                                                 msg->status_name, msg->status_text, msg->status_code );
 170                                 osrfLogWarning( OSRF_LOG_MARK, "The stack doesn't know what to do with "
 171                                                 "the provided message code: %d, name %s. Passing UP.",
 172                                                 msg->status_code, msg->status_name );
 173                                 new_msg->is_exception = 1;
 174                                 osrf_app_session_set_complete( session, msg->thread_trace );
 175                                 osrf_message_free(msg);
 176                                 return new_msg;
 177                 }
 178
 179                 return NULL;
 180
 181         } else if( msg->m_type == RESULT )
 182                 return msg;
 183
 184         return NULL;
 185
 186 }
 187
 188
 189 /** If we return a message, that message should be passed up the stack,
 190   * if we return NULL, we're finished for now...
 191   */
 192 osrf_message* _do_server( osrf_app_session* session, osrf_message* msg ) {
 193
 194         if(session == NULL || msg == NULL) return NULL;
 195
 196         osrfLogDebug( OSRF_LOG_MARK, "Server received message of type %d", msg->m_type );
 197
 198         switch( msg->m_type ) {
 199
 200                 case STATUS:
 201                                 return NULL;
 202
 203                 case DISCONNECT:
 204                                 /* session will be freed by the forker */
 205                                 osrfLogDebug(OSRF_LOG_MARK, "Client sent explicit disconnect");
 206                                 session->state = OSRF_SESSION_DISCONNECTED;
 207                                 return NULL;
 208
 209                 case CONNECT:
 210                                 osrfAppSessionStatus( session, OSRF_STATUS_OK,
 211                                                 "osrfConnectStatus", msg->thread_trace, "Connection Successful" );
 212                                 session->state = OSRF_SESSION_CONNECTED;
 213                                 return NULL;
 214
 215                 case REQUEST:
 216
 217                                 osrfLogDebug( OSRF_LOG_MARK, "server passing message %d to application handler "
 218                                                 "for session %s", msg->thread_trace, session->session_id );
 219                                 return msg;
 220
 221                 default:
 222                         osrfLogWarning( OSRF_LOG_MARK, "Server cannot handle message of type %d", msg->m_type );
 223                         session->state = OSRF_SESSION_DISCONNECTED;
 224                         return NULL;
 225
 226         }
 227 }
 228
 229
 230
 231
 232 int osrf_stack_application_handler( osrf_app_session* session, osrf_message* msg ) {
 233
 234         if(session == NULL || msg == NULL) return 0;
 235
 236         if(msg->m_type == RESULT && session->type == OSRF_SESSION_CLIENT) {
 237                 osrf_app_session_push_queue( session, msg );
 238                 return 1;
 239         }
 240
 241         if(msg->m_type != REQUEST) return 1;
 242
 243         char* method = msg->method_name;
 244         char* app       = session->remote_service;
 245         jsonObject* params = msg->_params;
 246
 247         osrfAppRunMethod( app, method,  session, msg->thread_trace, params );
 248
 249         osrfMessageFree(msg);
 250
 251         return 1;
 252
 253 }
 254