manager_mwi.c

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/*
 * Asterisk -- An open source telephony toolkit.
 *
 * Copyright (C) 2013, Digium, Inc.
 *
 * Matt Jordan <mjordan@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.
 */
 
/*! \file
 *
 * \brief The Asterisk Management Interface - AMI (MWI event handling)
 *
 * \author Matt Jordan <mjordan@digium.com>
 */
 
#include "asterisk.h"
 
#include "asterisk/manager.h"
#include "asterisk/app.h"
#include "asterisk/mwi.h"
#include "asterisk/channel.h"
#include "asterisk/stasis_message_router.h"
#include "asterisk/stasis.h"
 
struct stasis_message_router *mwi_state_router;
 
/*** DOCUMENTATION
 ***/
 
/*! \brief The \ref stasis subscription returned by the forwarding of the MWI topic
 * to the manager topic
 */
static struct stasis_forward *topic_forwarder;
 
/*! \brief Callback function used by \ref mwi_app_event_cb to weed out "Event" keys */
static int exclude_event_cb(const char *key)
{
    if (!strcmp(key, "Event")) {
        return -1;
    }
    return 0;
}
 
/*! \brief Generic MWI event callback used for one-off events from voicemail modules */
static void mwi_app_event_cb(void *data, struct stasis_subscription *sub,
                    struct stasis_message *message)
{
    struct ast_mwi_blob *payload = stasis_message_data(message);
    RAII_VAR(struct ast_str *, channel_event_string, NULL, ast_free);
    RAII_VAR(struct ast_str *, event_buffer, NULL, ast_free);
    struct ast_json *event_json = ast_json_object_get(payload->blob, "Event");
 
    if (!event_json) {
        return;
    }
 
    if (payload->mwi_state && payload->mwi_state->snapshot) {
        channel_event_string = ast_manager_build_channel_state_string(payload->mwi_state->snapshot);
    }
 
    event_buffer = ast_manager_str_from_json_object(payload->blob, exclude_event_cb);
    if (!event_buffer) {
        ast_log(AST_LOG_WARNING, "Failed to create payload for event %s\n", ast_json_string_get(event_json));
        return;
    }
 
    manager_event(EVENT_FLAG_CALL, ast_json_string_get(event_json),
            "Mailbox: %s\r\n"
            "%s"
            "%s",
            payload->mwi_state ? payload->mwi_state->uniqueid : "Unknown",
            ast_str_buffer(event_buffer),
            channel_event_string ? ast_str_buffer(channel_event_string) : "");
}
 
static void mwi_update_cb(void *data, struct stasis_subscription *sub,
                    struct stasis_message *message)
{
    struct ast_mwi_state *mwi_state;
    RAII_VAR(struct ast_str *, channel_event_string, NULL, ast_free);
 
    if (ast_mwi_state_type() != stasis_message_type(message)) {
        return;
    }
 
    mwi_state = stasis_message_data(message);
    if (!mwi_state) {
        return;
    }
 
    if (mwi_state->snapshot) {
        channel_event_string = ast_manager_build_channel_state_string(mwi_state->snapshot);
    }
 
    /*** DOCUMENTATION
        <managerEvent language="en_US" name="MessageWaiting">
            <managerEventInstance class="EVENT_FLAG_CALL">
                <synopsis>Raised when the state of messages in a voicemail mailbox
                has changed or when a channel has finished interacting with a
                mailbox.</synopsis>
                <syntax>
                    <channel_snapshot/>
                    <parameter name="Mailbox">
                        <para>The mailbox with the new message, specified as <literal>mailbox</literal>@<literal>context</literal></para>
                    </parameter>
                    <parameter name="Waiting">
                        <para>Whether or not the mailbox has messages waiting for it.</para>
                    </parameter>
                    <parameter name="New">
                        <para>The number of new messages.</para>
                    </parameter>
                    <parameter name="Old">
                        <para>The number of old messages.</para>
                    </parameter>
                </syntax>
                <description>
                    <note><para>The Channel related parameters are only present if a
                    channel was involved in the manipulation of a mailbox. If no
                    channel is involved, the parameters are not included with the
                    event.</para>
                    </note>
                </description>
            </managerEventInstance>
        </managerEvent>
    ***/
    manager_event(EVENT_FLAG_CALL, "MessageWaiting",
            "%s"
            "Mailbox: %s\r\n"
            "Waiting: %d\r\n"
            "New: %d\r\n"
            "Old: %d\r\n",
            AS_OR(channel_event_string, ""),
            mwi_state->uniqueid,
            ast_app_has_voicemail(mwi_state->uniqueid, NULL),
            mwi_state->new_msgs,
            mwi_state->old_msgs);
}
 
static void manager_mwi_shutdown(void)
{
    stasis_forward_cancel(topic_forwarder);
    topic_forwarder = NULL;
}
 
int manager_mwi_init(void)
{
    int ret = 0;
    struct stasis_topic *manager_topic;
    struct stasis_topic *mwi_topic;
    struct stasis_message_router *message_router;
 
    manager_topic = ast_manager_get_topic();
    if (!manager_topic) {
        return -1;
    }
    message_router = ast_manager_get_message_router();
    if (!message_router) {
        return -1;
    }
    mwi_topic = ast_mwi_topic_all();
    if (!mwi_topic) {
        return -1;
    }
 
    topic_forwarder = stasis_forward_all(mwi_topic, manager_topic);
    if (!topic_forwarder) {
        return -1;
    }
 
    ast_register_cleanup(manager_mwi_shutdown);
 
    ret |= stasis_message_router_add(message_router,
                     ast_mwi_state_type(),
                     mwi_update_cb,
                     NULL);
 
    ret |= stasis_message_router_add(message_router,
                     ast_mwi_vm_app_type(),
                     mwi_app_event_cb,
                     NULL);
 
    /* If somehow we failed to add any routes, just shut down the whole
     * thing and fail it.
     */
    if (ret) {
        manager_mwi_shutdown();
        return -1;
    }
 
    return 0;
}