res_mwi_devstate.c

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/*
 * Asterisk -- An open source telephony toolkit.
 *
 * Copyright (C) 2014, Schmooze Com, Inc.
 *
 * Jason Parker <jason.parker@schmoozecom.com>
 *
 * 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,
);