citadel/modules/jabber/xmpp_queue.c

   1 /*
   2  * $Id$
   3  *
   4  * XMPP event queue
   5  *
   6  * Copyright (c) 2007-2009 by Art Cancro
   7  *
   8  *  This program is free software; you can redistribute it and/or modify
   9  *  it under the terms of the GNU General Public License as published by
  10  *  the Free Software Foundation; either version 3 of the License, or
  11  *  (at your option) any later version.
  12  *
  13  *  This program is distributed in the hope that it will be useful,
  14  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *  GNU General Public License for more details.
  17  *
  18  *  You should have received a copy of the GNU General Public License
  19  *  along with this program; if not, write to the Free Software
  20  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  21  *
  22  */
  23
  24 #include "sysdep.h"
  25 #include <stdlib.h>
  26 #include <unistd.h>
  27 #include <stdio.h>
  28 #include <fcntl.h>
  29 #include <signal.h>
  30 #include <pwd.h>
  31 #include <errno.h>
  32 #include <sys/types.h>
  33
  34 #if TIME_WITH_SYS_TIME
  35 # include <sys/time.h>
  36 # include <time.h>
  37 #else
  38 # if HAVE_SYS_TIME_H
  39 #  include <sys/time.h>
  40 # else
  41 #  include <time.h>
  42 # endif
  43 #endif
  44
  45 #include <sys/wait.h>
  46 #include <string.h>
  47 #include <limits.h>
  48 #include <ctype.h>
  49 #include <expat.h>
  50 #include <libcitadel.h>
  51 #include "citadel.h"
  52 #include "server.h"
  53 #include "citserver.h"
  54 #include "support.h"
  55 #include "config.h"
  56 #include "internet_addressing.h"
  57 #include "md5.h"
  58 #include "ctdl_module.h"
  59 #include "serv_xmpp.h"
  60
  61 int queue_event_seq = 0;
  62
  63 void xmpp_queue_event(int event_type, char *email_addr) {
  64
  65         struct xmpp_event *xptr = NULL;
  66         struct xmpp_event *new_event = NULL;
  67         struct xmpp_event *last = NULL;
  68         int purged_something = 0;
  69         struct CitContext *cptr;
  70
  71         CtdlLogPrintf(CTDL_DEBUG, "xmpp_queue_event(%d, %s)\n", event_type, email_addr);
  72
  73         /* Purge events more than a minute old */
  74         begin_critical_section(S_XMPP_QUEUE);
  75         do {
  76                 purged_something = 0;
  77                 if (xmpp_queue != NULL) {
  78                         if ((time(NULL) - xmpp_queue->event_time) > 60) {
  79                                 xptr = xmpp_queue->next;
  80                                 free(xmpp_queue);
  81                                 xmpp_queue = xptr;
  82                                 purged_something = 1;
  83                         }
  84                 }
  85         } while(purged_something);
  86         end_critical_section(S_XMPP_QUEUE);
  87
  88         /* Create a new event */
  89         new_event = (struct xmpp_event *) malloc(sizeof(struct xmpp_event));
  90         new_event->next = NULL;
  91         new_event->event_time = time(NULL);
  92         new_event->event_seq = ++queue_event_seq;
  93         new_event->event_type = event_type;
  94         new_event->session_which_generated_this_event = CC->cs_pid;
  95         safestrncpy(new_event->event_jid, email_addr, sizeof new_event->event_jid);
  96
  97         /* Add it to the list */
  98         begin_critical_section(S_XMPP_QUEUE);
  99         if (xmpp_queue == NULL) {
 100                 xmpp_queue = new_event;
 101         }
 102         else {
 103                 for (xptr = xmpp_queue; xptr != NULL; xptr = xptr->next) {
 104                         if (xptr->next == NULL) {
 105                                 last = xptr;
 106                         }
 107                 }
 108                 last->next = new_event;
 109         }
 110         end_critical_section(S_XMPP_QUEUE);
 111
 112         /* Tell the sessions that something is happening */
 113         begin_critical_section(S_SESSION_TABLE);
 114         for (cptr = ContextList; cptr != NULL; cptr = cptr->next) {
 115                 if ((cptr->logged_in) && (cptr->h_async_function == xmpp_async_loop)) {
 116                         cptr->async_waiting = 1;
 117                 }
 118         }
 119         end_critical_section(S_SESSION_TABLE);
 120 }
 121
 122
 123 /*
 124  * Are we interested in anything from the queue?  (Called in async loop)
 125  */
 126 void xmpp_process_events(void) {
 127         struct xmpp_event *xptr = NULL;
 128         int highest_event = 0;
 129
 130         for (xptr=xmpp_queue; xptr!=NULL; xptr=xptr->next) {
 131                 if (xptr->event_seq > XMPP->last_event_processed) {
 132
 133                         switch(xptr->event_type) {
 134
 135                                 case XMPP_EVT_LOGIN:
 136                                 case XMPP_EVT_LOGOUT:
 137                                         if (xptr->session_which_generated_this_event != CC->cs_pid) {
 138                                                 xmpp_presence_notify(xptr->event_jid, xptr->event_type);
 139                                         }
 140                                         break;
 141                         }
 142
 143                         if (xptr->event_seq > highest_event) {
 144                                 highest_event = xptr->event_seq;
 145                         }
 146                 }
 147         }
 148
 149         XMPP->last_event_processed = highest_event;
 150 }