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 #include <time.h>
  25 #include <sys/wait.h>
  26 #include <string.h>
  27 #include <limits.h>
  28 #include <ctype.h>
  29 #include <expat.h>
  30 #include <libcitadel.h>
  31 #include "citadel.h"
  32 #include "server.h"
  33 #include "citserver.h"
  34 #include "support.h"
  35 #include "config.h"
  36 #include "internet_addressing.h"
  37 #include "ctdl_module.h"
  38 #include "serv_xmpp.h"
  39
  40 int queue_event_seq = 0;
  41
  42 void xmpp_queue_event(int event_type, char *email_addr) {
  43
  44         struct xmpp_event *xptr = NULL;
  45         struct xmpp_event *new_event = NULL;
  46         struct xmpp_event *last = NULL;
  47         int purged_something = 0;
  48         struct CitContext *cptr;
  49
  50         syslog(LOG_DEBUG, "xmpp: xmpp_queue_event(%d, %s)", event_type, email_addr);
  51
  52         /* Purge events more than a minute old */
  53         begin_critical_section(S_XMPP_QUEUE);
  54         do {
  55                 purged_something = 0;
  56                 if (xmpp_queue != NULL) {
  57                         if ((time(NULL) - xmpp_queue->event_time) > 60) {
  58                                 xptr = xmpp_queue->next;
  59                                 free(xmpp_queue);
  60                                 xmpp_queue = xptr;
  61                                 purged_something = 1;
  62                         }
  63                 }
  64         } while(purged_something);
  65         end_critical_section(S_XMPP_QUEUE);
  66
  67         /* Create a new event */
  68         new_event = (struct xmpp_event *) malloc(sizeof(struct xmpp_event));
  69         new_event->next = NULL;
  70         new_event->event_time = time(NULL);
  71         new_event->event_seq = ++queue_event_seq;
  72         new_event->event_type = event_type;
  73         new_event->session_which_generated_this_event = CC->cs_pid;
  74         safestrncpy(new_event->event_jid, email_addr, sizeof new_event->event_jid);
  75
  76         /* Add it to the list */
  77         begin_critical_section(S_XMPP_QUEUE);
  78         if (xmpp_queue == NULL) {
  79                 xmpp_queue = new_event;
  80         }
  81         else {
  82                 for (xptr = xmpp_queue; xptr != NULL; xptr = xptr->next) {
  83                         if (xptr->next == NULL) {
  84                                 last = xptr;
  85                         }
  86                 }
  87                 last->next = new_event;
  88         }
  89         end_critical_section(S_XMPP_QUEUE);
  90
  91         /* Tell the sessions that something is happening */
  92         begin_critical_section(S_SESSION_TABLE);
  93         for (cptr = ContextList; cptr != NULL; cptr = cptr->next) {
  94                 if ((cptr->logged_in) && (cptr->h_async_function == xmpp_async_loop)) {
  95                         set_async_waiting(cptr);
  96                 }
  97         }
  98         end_critical_section(S_SESSION_TABLE);
  99 }
 100
 101
 102 /*
 103  * Are we interested in anything from the queue?  (Called in async loop)
 104  */
 105 void xmpp_process_events(void) {
 106         struct xmpp_event *xptr = NULL;
 107         int highest_event = 0;
 108
 109         for (xptr=xmpp_queue; xptr!=NULL; xptr=xptr->next) {
 110                 if (xptr->event_seq > XMPP->last_event_processed) {
 111
 112                         switch(xptr->event_type) {
 113
 114                                 case XMPP_EVT_LOGIN:
 115                                 case XMPP_EVT_LOGOUT:
 116                                         if (xptr->session_which_generated_this_event != CC->cs_pid) {
 117                                                 xmpp_presence_notify(xptr->event_jid, xptr->event_type);
 118                                         }
 119                                         break;
 120                         }
 121
 122                         if (xptr->event_seq > highest_event) {
 123                                 highest_event = xptr->event_seq;
 124                         }
 125                 }
 126         }
 127
 128         XMPP->last_event_processed = highest_event;
 129 }