citadel/modules/xmpp/xmpp_queue.c

   1 /*
   2  * XMPP event queue
   3  *
   4  * Copyright (c) 2007-2021 by Art Cancro
   5  *
   6  * This program is open source software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 3.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  */
  14
  15 #include "sysdep.h"
  16 #include <stdlib.h>
  17 #include <unistd.h>
  18 #include <stdio.h>
  19 #include <fcntl.h>
  20 #include <signal.h>
  21 #include <pwd.h>
  22 #include <errno.h>
  23 #include <sys/types.h>
  24
  25 #if TIME_WITH_SYS_TIME
  26 # include <sys/time.h>
  27 # include <time.h>
  28 #else
  29 # if HAVE_SYS_TIME_H
  30 #  include <sys/time.h>
  31 # else
  32 #  include <time.h>
  33 # endif
  34 #endif
  35
  36 #include <sys/wait.h>
  37 #include <string.h>
  38 #include <limits.h>
  39 #include <ctype.h>
  40 #include <expat.h>
  41 #include <libcitadel.h>
  42 #include "citadel.h"
  43 #include "server.h"
  44 #include "citserver.h"
  45 #include "support.h"
  46 #include "config.h"
  47 #include "internet_addressing.h"
  48 #include "ctdl_module.h"
  49 #include "serv_xmpp.h"
  50
  51 int queue_event_seq = 0;
  52
  53 void xmpp_queue_event(int event_type, char *email_addr) {
  54
  55         struct xmpp_event *xptr = NULL;
  56         struct xmpp_event *new_event = NULL;
  57         struct xmpp_event *last = NULL;
  58         int purged_something = 0;
  59         struct CitContext *cptr;
  60
  61         syslog(LOG_DEBUG, "xmpp: xmpp_queue_event(%d, %s)", event_type, email_addr);
  62
  63         /* Purge events more than a minute old */
  64         begin_critical_section(S_XMPP_QUEUE);
  65         do {
  66                 purged_something = 0;
  67                 if (xmpp_queue != NULL) {
  68                         if ((time(NULL) - xmpp_queue->event_time) > 60) {
  69                                 xptr = xmpp_queue->next;
  70                                 free(xmpp_queue);
  71                                 xmpp_queue = xptr;
  72                                 purged_something = 1;
  73                         }
  74                 }
  75         } while(purged_something);
  76         end_critical_section(S_XMPP_QUEUE);
  77
  78         /* Create a new event */
  79         new_event = (struct xmpp_event *) malloc(sizeof(struct xmpp_event));
  80         new_event->next = NULL;
  81         new_event->event_time = time(NULL);
  82         new_event->event_seq = ++queue_event_seq;
  83         new_event->event_type = event_type;
  84         new_event->session_which_generated_this_event = CC->cs_pid;
  85         safestrncpy(new_event->event_jid, email_addr, sizeof new_event->event_jid);
  86
  87         /* Add it to the list */
  88         begin_critical_section(S_XMPP_QUEUE);
  89         if (xmpp_queue == NULL) {
  90                 xmpp_queue = new_event;
  91         }
  92         else {
  93                 for (xptr = xmpp_queue; xptr != NULL; xptr = xptr->next) {
  94                         if (xptr->next == NULL) {
  95                                 last = xptr;
  96                         }
  97                 }
  98                 last->next = new_event;
  99         }
 100         end_critical_section(S_XMPP_QUEUE);
 101
 102         /* Tell the sessions that something is happening */
 103         begin_critical_section(S_SESSION_TABLE);
 104         for (cptr = ContextList; cptr != NULL; cptr = cptr->next) {
 105                 if ((cptr->logged_in) && (cptr->h_async_function == xmpp_async_loop)) {
 106                         set_async_waiting(cptr);
 107                 }
 108         }
 109         end_critical_section(S_SESSION_TABLE);
 110 }
 111
 112
 113 /*
 114  * Are we interested in anything from the queue?  (Called in async loop)
 115  */
 116 void xmpp_process_events(void) {
 117         struct xmpp_event *xptr = NULL;
 118         int highest_event = 0;
 119
 120         for (xptr=xmpp_queue; xptr!=NULL; xptr=xptr->next) {
 121                 if (xptr->event_seq > XMPP->last_event_processed) {
 122
 123                         switch(xptr->event_type) {
 124
 125                                 case XMPP_EVT_LOGIN:
 126                                 case XMPP_EVT_LOGOUT:
 127                                         if (xptr->session_which_generated_this_event != CC->cs_pid) {
 128                                                 xmpp_presence_notify(xptr->event_jid, xptr->event_type);
 129                                         }
 130                                         break;
 131                         }
 132
 133                         if (xptr->event_seq > highest_event) {
 134                                 highest_event = xptr->event_seq;
 135                         }
 136                 }
 137         }
 138
 139         XMPP->last_event_processed = highest_event;
 140 }