res_manager_devicestate.c

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/*
 * Asterisk -- An open source telephony toolkit.
 *
 * Copyright (C) 2014, Digium, Inc.
 *
 * Mark Michelson <mmichelson@digium.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>
 ***/
 
/*** DOCUMENTATION
    <manager name="DeviceStateList" language="en_US">
        <synopsis>
            List the current known device states.
        </synopsis>
        <syntax>
            <xi:include xpointer="xpointer(/docs/manager[@name='Login']/syntax/parameter[@name='ActionID'])" />
        </syntax>
        <description>
            <para>This will list out all known device states in a
            sequence of <replaceable>DeviceStateChange</replaceable> events.
            When finished, a <replaceable>DeviceStateListComplete</replaceable> event
            will be emitted.</para>
        </description>
        <see-also>
            <ref type="managerEvent">DeviceStateChange</ref>
            <ref type="function">DEVICE_STATE</ref>
        </see-also>
        <responses>
            <list-elements>
                <xi:include xpointer="xpointer(/docs/managerEvent[@name='DeviceStateChange'])" />
            </list-elements>
            <managerEvent name="DeviceStateListComplete" language="en_US">
                <managerEventInstance class="EVENT_FLAG_COMMAND">
                    <synopsis>
                        Indicates the end of the list the current known extension states.
                    </synopsis>
                    <syntax>
                        <parameter name="EventList">
                            <para>Conveys the status of the event list.</para>
                        </parameter>
                        <parameter name="ListItems">
                            <para>Conveys the number of statuses reported.</para>
                        </parameter>
                    </syntax>
                </managerEventInstance>
            </managerEvent>
        </responses>
    </manager>
 ***/
 
 
#include "asterisk.h"
#include "asterisk/module.h"
#include "asterisk/manager.h"
#include "asterisk/stasis.h"
#include "asterisk/devicestate.h"
 
static struct stasis_forward *topic_forwarder;
 
static int action_devicestatelist(struct mansession *s, const struct message *m)
{
    RAII_VAR(struct ao2_container *, device_states, NULL, ao2_cleanup);
    const char *action_id = astman_get_header(m, "ActionID");
    struct stasis_message *msg;
    struct ao2_iterator it_states;
    int count = 0;
 
    device_states = stasis_cache_dump_by_eid(ast_device_state_cache(),
        ast_device_state_message_type(), NULL);
    if (!device_states) {
        astman_send_error(s, m, "Memory Allocation Failure");
        return 0;
    }
 
    astman_send_listack(s, m, "Device State Changes will follow", "start");
 
    it_states = ao2_iterator_init(device_states, 0);
    for (; (msg = ao2_iterator_next(&it_states)); ao2_ref(msg, -1)) {
        struct ast_manager_event_blob *blob = stasis_message_to_ami(msg);
 
        if (!blob) {
            continue;
        }
 
        count++;
 
        astman_append(s, "Event: %s\r\n", blob->manager_event);
        if (!ast_strlen_zero(action_id)) {
            astman_append(s, "ActionID: %s\r\n", action_id);
        }
        astman_append(s, "%s\r\n", blob->extra_fields);
        ao2_ref(blob, -1);
    }
    ao2_iterator_destroy(&it_states);
 
    astman_send_list_complete_start(s, m, "DeviceStateListComplete", count);
    astman_send_list_complete_end(s);
 
    return 0;
}
 
static int unload_module(void)
{
    topic_forwarder = stasis_forward_cancel(topic_forwarder);
    ast_manager_unregister("DeviceStateList");
 
    return 0;
}
 
static int load_module(void)
{
    struct stasis_topic *manager_topic;
 
    manager_topic = ast_manager_get_topic();
    if (!manager_topic) {
        return AST_MODULE_LOAD_DECLINE;
    }
    topic_forwarder = stasis_forward_all(ast_device_state_topic_all(), manager_topic);
    if (!topic_forwarder) {
        return AST_MODULE_LOAD_DECLINE;
    }
 
    if (ast_manager_register_xml("DeviceStateList", EVENT_FLAG_CALL | EVENT_FLAG_REPORTING,
                                 action_devicestatelist)) {
        topic_forwarder = stasis_forward_cancel(topic_forwarder);
        return AST_MODULE_LOAD_DECLINE;
    }
 
    return AST_MODULE_LOAD_SUCCESS;
}
 
AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_LOAD_ORDER, "Manager Device State Topic Forwarder",
    .support_level = AST_MODULE_SUPPORT_CORE,
    .load = load_module,
    .unload = unload_module,
    .load_pri = AST_MODPRI_DEVSTATE_CONSUMER,
);