citadel/modules/xmpp/xmpp_queue.c

   1 /*
   2  * XMPP event queue
   3  *
   4  * Copyright (c) 2007-2009 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  *
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *
  17  *
  18  *
  19  *
  20  */
  21
  22 #include "sysdep.h"
  23 #include <stdlib.h>
  24 #include <unistd.h>
  25 #include <stdio.h>
  26 #include <fcntl.h>
  27 #include <signal.h>
  28 #include <pwd.h>
  29 #include <errno.h>
  30 #include <sys/types.h>
  31
  32 #if TIME_WITH_SYS_TIME
  33 # include <sys/time.h>
  34 # include <time.h>
  35 #else
  36 # if HAVE_SYS_TIME_H
  37 #  include <sys/time.h>
  38 # else
  39 #  include <time.h>
  40 # endif
  41 #endif
  42
  43 #include <sys/wait.h>
  44 #include <string.h>
  45 #include <limits.h>
  46 #include <ctype.h>
  47 #include <expat.h>
  48 #include <libcitadel.h>
  49 #include "citadel.h"
  50 #include "server.h"
  51 #include "citserver.h"
  52 #include "support.h"
  53 #include "config.h"
  54 #include "internet_addressing.h"
  55 #include "md5.h"
  56 #include "ctdl_module.h"
  57 #include "serv_xmpp.h"
  58
  59 int queue_event_seq = 0;
  60 struct xmpp_event *xmpp_queue = NULL;
  61
  62 void xmpp_queue_event(int event_type, char *email_addr) {
  63
  64         struct xmpp_event *xptr = NULL;
  65         struct xmpp_event *new_event = NULL;
  66         struct xmpp_event *last = NULL;
  67         int purged_something = 0;
  68         struct CitContext *cptr;
  69
  70         XMPP_syslog(LOG_DEBUG, "xmpp_queue_event(%d, %s)\n", event_type, email_addr);
  71
  72         /* Purge events more than a minute old */
  73         begin_critical_section(S_XMPP_QUEUE);
  74         do {
  75                 purged_something = 0;
  76                 if (xmpp_queue != NULL) {
  77                         if ((time(NULL) - xmpp_queue->event_time) > 60) {
  78                                 xptr = xmpp_queue->next;
  79                                 free(xmpp_queue);
  80                                 xmpp_queue = xptr;
  81                                 purged_something = 1;
  82                         }
  83                 }
  84         } while(purged_something);
  85         end_critical_section(S_XMPP_QUEUE);
  86
  87         /* Create a new event */
  88         new_event = (struct xmpp_event *) malloc(sizeof(struct xmpp_event));
  89         new_event->next = NULL;
  90         new_event->event_time = time(NULL);
  91         new_event->event_seq = ++queue_event_seq;
  92         new_event->event_type = event_type;
  93         new_event->session_which_generated_this_event = CC->cs_pid;
  94         safestrncpy(new_event->event_jid, email_addr, sizeof new_event->event_jid);
  95
  96         /* Add it to the list */
  97         begin_critical_section(S_XMPP_QUEUE);
  98         if (xmpp_queue == NULL) {
  99                 xmpp_queue = new_event;
 100         }
 101         else {
 102                 for (xptr = xmpp_queue; xptr != NULL; xptr = xptr->next) {
 103                         if (xptr->next == NULL) {
 104                                 last = xptr;
 105                         }
 106                 }
 107                 last->next = new_event;
 108         }
 109         end_critical_section(S_XMPP_QUEUE);
 110
 111         /* Tell the sessions that something is happening */
 112         begin_critical_section(S_SESSION_TABLE);
 113         for (cptr = ContextList; cptr != NULL; cptr = cptr->next) {
 114                 if ((cptr->logged_in) && (cptr->h_async_function == xmpp_async_loop)) {
 115                         set_async_waiting(cptr);
 116                 }
 117         }
 118         end_critical_section(S_SESSION_TABLE);
 119 }
 120
 121
 122 /*
 123  * Are we interested in anything from the queue?  (Called in async loop)
 124  */
 125 void xmpp_process_events(void) {
 126         struct xmpp_event *xptr = NULL;
 127         int highest_event = 0;
 128
 129         for (xptr=xmpp_queue; xptr!=NULL; xptr=xptr->next) {
 130                 if (xptr->event_seq > XMPP->last_event_processed) {
 131
 132                         switch(xptr->event_type) {
 133
 134                                 case XMPP_EVT_LOGIN:
 135                                 case XMPP_EVT_LOGOUT:
 136                                         if (xptr->session_which_generated_this_event != CC->cs_pid) {
 137                                                 xmpp_presence_notify(xptr->event_jid, xptr->event_type);
 138                                         }
 139                                         break;
 140                         }
 141
 142                         if (xptr->event_seq > highest_event) {
 143                                 highest_event = xptr->event_seq;
 144                         }
 145                 }
 146         }
 147
 148         XMPP->last_event_processed = highest_event;
 149 }
 150
 151
 152 void xmpp_cleanup_events(void)
 153 {
 154         struct xmpp_event *ptr, *ptr2;
 155         begin_critical_section(S_XMPP_QUEUE);
 156         ptr = xmpp_queue;
 157         xmpp_queue = NULL;
 158         while (ptr != NULL) {
 159                 ptr2 = ptr->next;
 160                 free(ptr);
 161                 ptr = ptr2;
 162         }
 163         end_critical_section(S_XMPP_QUEUE);
 164
 165 }
 166
 167 CTDL_MODULE_INIT(xmpp_queue)
 168 {
 169         if (!threading) {
 170
 171                 CtdlRegisterCleanupHook(xmpp_cleanup_events);
 172         }
 173
 174         /* return our module name for the log */
 175         return "xmpp_queue";
 176 }