res_pjsip_mwi.c

static const struct ast_sorcery_observer mwi_contact_observer = {
	.created = mwi_contact_added,
	.updated = mwi_contact_updated,
};

/*! \brief Task invoked to send initial MWI NOTIFY for unsolicited */
static int send_initial_notify_all(void *obj)
{
	ao2_callback(unsolicited_mwi, OBJ_NODATA, send_notify, NULL);

	return 0;
}

/*! \brief Event callback which fires initial unsolicited MWI NOTIFY messages when we're fully booted */
static void mwi_startup_event_cb(void *data, struct stasis_subscription *sub, struct stasis_message *message)
{
	struct ast_json_payload *payload;
	const char *type;

	if (stasis_message_type(message) != ast_manager_get_generic_type()) {
		return;
	}

	payload = stasis_message_data(message);
	type = ast_json_string_get(ast_json_object_get(payload->json, "type"));

	if (strcmp(type, "FullyBooted")) {
		return;
	}

	ast_sip_push_task(NULL, send_initial_notify_all, NULL);

	stasis_unsubscribe(sub);
}

static int reload(void)
{
	create_mwi_subscriptions();
	return 0;
}

static int load_module(void)
{
	CHECK_PJSIP_MODULE_LOADED();

	if (ast_sip_register_subscription_handler(&mwi_handler)) {
		return AST_MODULE_LOAD_DECLINE;
	}

	unsolicited_mwi = ao2_container_alloc(MWI_BUCKETS, mwi_sub_hash, mwi_sub_cmp);
	if (!unsolicited_mwi) {
		ast_sip_unregister_subscription_handler(&mwi_handler);
		return AST_MODULE_LOAD_DECLINE;
	}

	create_mwi_subscriptions();
	ast_sorcery_observer_add(ast_sip_get_sorcery(), "contact", &mwi_contact_observer);

	if (ast_test_flag(&ast_options, AST_OPT_FLAG_FULLY_BOOTED)) {
		ast_sip_push_task(NULL, send_initial_notify_all, NULL);
	} else {
		stasis_subscribe_pool(ast_manager_get_topic(), mwi_startup_event_cb, NULL);
	}

	return AST_MODULE_LOAD_SUCCESS;
}

static int unload_module(void)
{
	ao2_callback(unsolicited_mwi, OBJ_UNLINK | OBJ_NODATA | OBJ_MULTIPLE, unsubscribe, NULL);
	ao2_ref(unsolicited_mwi, -1);
	ast_sorcery_observer_remove(ast_sip_get_sorcery(), "contact", &mwi_contact_observer);
	ast_sip_unregister_subscription_handler(&mwi_handler);
	return 0;
}

AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_LOAD_ORDER, "PJSIP MWI resource",
	.support_level = AST_MODULE_SUPPORT_CORE,
	.load = load_module,
	.unload = unload_module,
	.reload = reload,
	.load_pri = AST_MODPRI_CHANNEL_DEPEND,
);