res_mwi_devstate.c

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/*
 * Asterisk -- An open source telephony toolkit.
 *
 * Copyright (C) 2014, Schmooze Com, Inc.
 *
 * Jason Parker <[email protected]>
 *
 * See http://www.asterisk.org for more information about
 * the Asterisk project. Please do not directly contact
 * any of the maintainers of this project for assistance;
 * the project provides a web site, mailing lists and IRC
 * channels for your use.
 *
 * This program is free software, distributed under the terms of
 * the GNU General Public License Version 2. See the LICENSE file
 * at the top of the source tree.
 */

/*** MODULEINFO
   <support_level>core</support_level>
 ***/

#include "asterisk.h"

#include "asterisk/mwi.h"
#include "asterisk/devicestate.h"
#include "asterisk/module.h"
#include "asterisk/stasis_message_router.h"
#include "asterisk/stasis.h"

static struct stasis_subscription *mwi_sub;

static void mwi_update_cb(void *data, struct stasis_subscription *sub,
                struct stasis_message *msg)
{
   struct ast_mwi_state *mwi_state;

   if (ast_mwi_state_type() != stasis_message_type(msg)) {
      return;
   }

   mwi_state = stasis_message_data(msg);
   if (!mwi_state) {
      return;
   }

   if (mwi_state->new_msgs > 0) {
      ast_debug(1, "Sending inuse devstate change for MWI:%s\n", mwi_state->uniqueid);
      ast_devstate_changed(AST_DEVICE_INUSE, AST_DEVSTATE_CACHABLE, "MWI:%s", mwi_state->uniqueid);
   } else {
      ast_debug(1, "Sending not inuse devstate change for MWI:%s\n", mwi_state->uniqueid);
      ast_devstate_changed(AST_DEVICE_NOT_INUSE, AST_DEVSTATE_CACHABLE, "MWI:%s", mwi_state->uniqueid);
   }
}

static int mwi_cached_cb(void *obj, void *arg, int flags)
{
   struct stasis_message *msg = obj;
   mwi_update_cb(NULL, mwi_sub, msg);

   return 0;
}

static int unload_module(void)
{
   mwi_sub = stasis_unsubscribe(mwi_sub);

   return 0;
}

static int load_module(void)
{
   struct ao2_container *cached;

   if (!(mwi_sub = stasis_subscribe(ast_mwi_topic_all(), mwi_update_cb, NULL))) {
      return AST_MODULE_LOAD_DECLINE;
   }

   if (stasis_subscription_accept_message_type(mwi_sub, ast_mwi_state_type())) {
      unload_module();
      return AST_MODULE_LOAD_DECLINE;
   }

   if (stasis_subscription_set_filter(mwi_sub, STASIS_SUBSCRIPTION_FILTER_SELECTIVE)) {
      unload_module();
      return AST_MODULE_LOAD_DECLINE;
   }

   cached = stasis_cache_dump(ast_mwi_state_cache(), NULL);
   if (!cached) {
      unload_module();
      return AST_MODULE_LOAD_DECLINE;
   }
   ao2_callback(cached, OBJ_NODATA, mwi_cached_cb, NULL);
   ao2_ref(cached, -1);

   return AST_MODULE_LOAD_SUCCESS;
}

AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_LOAD_ORDER, "MWI Device State Subscriptions",
   .support_level = AST_MODULE_SUPPORT_CORE,
   .load = load_module,
   .unload = unload_module,
   .load_pri = AST_MODPRI_DEVSTATE_PROVIDER,
);