app_stasis.c

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/*
 * Asterisk -- An open source telephony toolkit.
 *
 * Copyright (C) 2012 - 2013, Digium, Inc.
 *
 * David M. Lee, II <dlee@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 Stasis dialplan application.
 *
 * \author David M. Lee, II <dlee@digium.com>
 */
 
/*** MODULEINFO
    <depend>res_stasis</depend>
    <support_level>core</support_level>
 ***/
 
#include "asterisk.h"
 
#include "asterisk/app.h"
#include "asterisk/module.h"
#include "asterisk/pbx.h"
#include "asterisk/stasis.h"
#include "asterisk/stasis_app_impl.h"
 
/*** DOCUMENTATION
    <application name="Stasis" language="en_US">
        <synopsis>Invoke an external Stasis application.</synopsis>
        <syntax>
            <parameter name="app_name" required="true">
                <para>Name of the application to invoke.</para>
            </parameter>
            <parameter name="args">
                <para>Optional comma-delimited arguments for the
                application invocation.</para>
            </parameter>
        </syntax>
        <description>
            <para>Invoke a Stasis application.</para>
            <para>This application will set the following channel variable upon
            completion:</para>
            <variablelist>
                <variable name="STASISSTATUS">
                    <para>This indicates the status of the execution of the
                    Stasis application.</para>
                    <value name="SUCCESS">
                        The channel has exited Stasis without any failures in
                        Stasis.
                    </value>
                    <value name="FAILED">
                        A failure occurred when executing the Stasis
                        The app registry is not instantiated; The app
                        application. Some (not all) possible reasons for this:
                        requested is not registered; The app requested is not
                        active; Stasis couldn't send a start message.
                    </value>
                </variable>
            </variablelist>
        </description>
    </application>
 ***/
 
/*! \brief Maximum number of arguments for the Stasis dialplan application */
#define MAX_ARGS 128
 
/*! \brief Dialplan application name */
static const char *stasis = "Stasis";
 
/*! \brief Stasis dialplan application callback */
static int app_exec(struct ast_channel *chan, const char *data)
{
    char *parse = NULL;
    int ret = -1;
 
    AST_DECLARE_APP_ARGS(args,
        AST_APP_ARG(app_name);
        AST_APP_ARG(app_argv)[MAX_ARGS];
    );
 
    ast_assert(chan != NULL);
    ast_assert(data != NULL);
 
    pbx_builtin_setvar_helper(chan, "STASISSTATUS", "");
 
    /* parse the arguments */
    parse = ast_strdupa(data);
    AST_STANDARD_APP_ARGS(args, parse);
 
    if (args.argc < 1) {
        ast_log(LOG_WARNING, "Stasis app_name argument missing\n");
    } else {
        ret = stasis_app_exec(chan,
                              args.app_name,
                              args.argc - 1,
                              args.app_argv);
    }
 
    if (ret) {
        /* set ret to 0 so pbx_core doesnt hangup the channel */
        if (!ast_check_hangup(chan)) {
            ret = 0;
        } else {
            ret = -1;
        }
        pbx_builtin_setvar_helper(chan, "STASISSTATUS", "FAILED");
    } else {
        pbx_builtin_setvar_helper(chan, "STASISSTATUS", "SUCCESS");
    }
 
    return ret;
}
 
static int load_module(void)
{
    return ast_register_application_xml(stasis, app_exec);
}
 
static int unload_module(void)
{
    return ast_unregister_application(stasis);
}
 
AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_DEFAULT, "Stasis dialplan application",
    .support_level = AST_MODULE_SUPPORT_CORE,
    .load = load_module,
    .unload = unload_module,
    .requires = "res_stasis",
);