citadel/server/modules/xmpp/xmpp_queue.c

   1 // XMPP event queue
   2 // Copyright (c) 2007-2024 by Art Cancro
   3 // This program is open source software.  Use, duplication, or disclosure is subject to the GNU General Public License v3.
   4
   5 #include "../../sysdep.h"
   6 #include <stdlib.h>
   7 #include <unistd.h>
   8 #include <stdio.h>
   9 #include <fcntl.h>
  10 #include <signal.h>
  11 #include <pwd.h>
  12 #include <errno.h>
  13 #include <sys/types.h>
  14 #include <time.h>
  15 #include <sys/wait.h>
  16 #include <string.h>
  17 #include <limits.h>
  18 #include <ctype.h>
  19 #include <expat.h>
  20 #include <libcitadel.h>
  21 #include "../../citadel_defs.h"
  22 #include "../../server.h"
  23 #include "../../citserver.h"
  24 #include "../../support.h"
  25 #include "../../config.h"
  26 #include "../../internet_addressing.h"
  27 #include "../../ctdl_module.h"
  28 #include "serv_xmpp.h"
  29
  30 int queue_event_seq = 0;
  31
  32 void xmpp_queue_event(int event_type, char *email_addr) {
  33
  34         struct xmpp_event *xptr = NULL;
  35         struct xmpp_event *new_event = NULL;
  36         struct xmpp_event *last = NULL;
  37         int purged_something = 0;
  38         struct CitContext *cptr;
  39
  40         syslog(LOG_DEBUG, "xmpp: xmpp_queue_event(%d, %s)", event_type, email_addr);
  41
  42         // Purge events more than a minute old
  43         begin_critical_section(S_XMPP_QUEUE);
  44         do {
  45                 purged_something = 0;
  46                 if (xmpp_queue != NULL) {
  47                         if ((time(NULL) - xmpp_queue->event_time) > 60) {
  48                                 xptr = xmpp_queue->next;
  49                                 free(xmpp_queue);
  50                                 xmpp_queue = xptr;
  51                                 purged_something = 1;
  52                         }
  53                 }
  54         } while(purged_something);
  55         end_critical_section(S_XMPP_QUEUE);
  56
  57         // Create a new event
  58         new_event = (struct xmpp_event *) malloc(sizeof(struct xmpp_event));
  59         new_event->next = NULL;
  60         new_event->event_time = time(NULL);
  61         new_event->event_seq = ++queue_event_seq;
  62         new_event->event_type = event_type;
  63         new_event->session_which_generated_this_event = CC->cs_pid;
  64         safestrncpy(new_event->event_jid, email_addr, sizeof new_event->event_jid);
  65
  66         // Add it to the list
  67         begin_critical_section(S_XMPP_QUEUE);
  68         if (xmpp_queue == NULL) {
  69                 xmpp_queue = new_event;
  70         }
  71         else {
  72                 for (xptr = xmpp_queue; xptr != NULL; xptr = xptr->next) {
  73                         if (xptr->next == NULL) {
  74                                 last = xptr;
  75                         }
  76                 }
  77                 last->next = new_event;
  78         }
  79         end_critical_section(S_XMPP_QUEUE);
  80
  81         // Tell the sessions that something is happening
  82         begin_critical_section(S_SESSION_TABLE);
  83         for (cptr = ContextList; cptr != NULL; cptr = cptr->next) {
  84                 if ((cptr->logged_in) && (cptr->h_async_function == xmpp_async_loop)) {
  85                         set_async_waiting(cptr);
  86                 }
  87         }
  88         end_critical_section(S_SESSION_TABLE);
  89 }
  90
  91
  92 // Are we interested in anything from the queue?  (Called in async loop)
  93 void xmpp_process_events(void) {
  94         struct xmpp_event *xptr = NULL;
  95         int highest_event = 0;
  96
  97         for (xptr=xmpp_queue; xptr!=NULL; xptr=xptr->next) {
  98                 if (xptr->event_seq > XMPP->last_event_processed) {
  99
 100                         switch(xptr->event_type) {
 101
 102                                 case XMPP_EVT_LOGIN:
 103                                 case XMPP_EVT_LOGOUT:
 104                                         if (xptr->session_which_generated_this_event != CC->cs_pid) {
 105                                                 xmpp_presence_notify(xptr->event_jid, xptr->event_type);
 106                                         }
 107                                         break;
 108                         }
 109
 110                         if (xptr->event_seq > highest_event) {
 111                                 highest_event = xptr->event_seq;
 112                         }
 113                 }
 114         }
 115
 116         XMPP->last_event_processed = highest_event;
 117 }