citadel/modules/jabber/xmpp_queue.c

   1 /*
   2  * $Id$
   3  *
   4  * XMPP event queue
   5  *
   6  * Copyright (c) 2007 by Art Cancro
   7  * This code is released under the terms of the GNU General Public License.
   8  *
   9  */
  10
  11 #include "sysdep.h"
  12 #include <stdlib.h>
  13 #include <unistd.h>
  14 #include <stdio.h>
  15 #include <fcntl.h>
  16 #include <signal.h>
  17 #include <pwd.h>
  18 #include <errno.h>
  19 #include <sys/types.h>
  20
  21 #if TIME_WITH_SYS_TIME
  22 # include <sys/time.h>
  23 # include <time.h>
  24 #else
  25 # if HAVE_SYS_TIME_H
  26 #  include <sys/time.h>
  27 # else
  28 #  include <time.h>
  29 # endif
  30 #endif
  31
  32 #include <sys/wait.h>
  33 #include <string.h>
  34 #include <limits.h>
  35 #include <ctype.h>
  36 #include <libcitadel.h>
  37 #include "citadel.h"
  38 #include "server.h"
  39 #include "citserver.h"
  40 #include "support.h"
  41 #include "config.h"
  42 #include "internet_addressing.h"
  43 #include "md5.h"
  44 #include "ctdl_module.h"
  45
  46 #ifdef HAVE_EXPAT
  47 #include <expat.h>
  48 #include "serv_xmpp.h"
  49
  50 int queue_event_seq = 0;
  51
  52 void xmpp_queue_event(int event_type, char *email_addr) {
  53
  54         struct xmpp_event *xptr = NULL;
  55         struct xmpp_event *new_event = NULL;
  56         struct xmpp_event *last = NULL;
  57         int purged_something = 0;
  58         struct CitContext *cptr;
  59
  60         lprintf(CTDL_DEBUG, "xmpp_queue_event(%d, %s)\n", event_type, email_addr);
  61
  62         /* Purge events more than a minute old */
  63         begin_critical_section(S_XMPP_QUEUE);
  64         do {
  65                 purged_something = 0;
  66                 if (xmpp_queue != NULL) {
  67                         if ((time(NULL) - xmpp_queue->event_time) > 60) {
  68                                 xptr = xmpp_queue->next;
  69                                 free(xmpp_queue);
  70                                 xmpp_queue = xptr;
  71                                 purged_something = 1;
  72                         }
  73                 }
  74         } while(purged_something);
  75         end_critical_section(S_XMPP_QUEUE);
  76
  77         /* Create a new event */
  78         new_event = (struct xmpp_event *) malloc(sizeof(struct xmpp_event));
  79         new_event->next = NULL;
  80         new_event->event_time = time(NULL);
  81         new_event->event_seq = ++queue_event_seq;
  82         new_event->event_type = event_type;
  83         new_event->session_which_generated_this_event = CC->cs_pid;
  84         safestrncpy(new_event->event_jid, email_addr, sizeof new_event->event_jid);
  85
  86         /* Add it to the list */
  87         begin_critical_section(S_XMPP_QUEUE);
  88         if (xmpp_queue == NULL) {
  89                 xmpp_queue = new_event;
  90         }
  91         else {
  92                 for (xptr = xmpp_queue; xptr != NULL; xptr = xptr->next) {
  93                         if (xptr->next == NULL) {
  94                                 last = xptr;
  95                         }
  96                 }
  97                 last->next = new_event;
  98         }
  99         end_critical_section(S_XMPP_QUEUE);
 100
 101         /* Tell the sessions that something is happening */
 102         for (cptr = ContextList; cptr != NULL; cptr = cptr->next) {
 103                 if (cptr->h_async_function == xmpp_async_loop) {
 104                         cptr->async_waiting = 1;
 105                 }
 106         }
 107 }
 108
 109
 110 /*
 111  * Are we interested in anything from the queue?  (Called in async loop)
 112  */
 113 void xmpp_process_events(void) {
 114         struct xmpp_event *xptr = NULL;
 115         int highest_event = 0;
 116
 117         for (xptr=xmpp_queue; xptr!=NULL; xptr=xptr->next) {
 118                 if (xptr->event_seq > XMPP->last_event_processed) {
 119
 120                         switch(xptr->event_type) {
 121
 122                                 case XMPP_EVT_LOGIN:
 123                                         if (xptr->session_which_generated_this_event != CC->cs_pid) {
 124                                                 xmpp_presence_notify(xptr->event_jid, "available");
 125                                         }
 126                                         break;
 127
 128                                 case XMPP_EVT_LOGOUT:
 129                                         if (xptr->session_which_generated_this_event != CC->cs_pid) {
 130                                                 xmpp_presence_notify(xptr->event_jid, "unavailable");
 131                                         }
 132                                         break;
 133
 134                         }
 135
 136                         if (xptr->event_seq > highest_event) {
 137                                 highest_event = xptr->event_seq;
 138                         }
 139                 }
 140         }
 141
 142         XMPP->last_event_processed = highest_event;
 143 }
 144
 145
 146 #endif  /* HAVE_EXPAT */