func_groupcount.c

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/*
 * Asterisk -- An open source telephony toolkit.
 *
 * Copyright (C) 1999 - 2006, Digium, Inc.
 *
 * 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 Channel group related dialplan functions
 *
 * \ingroup functions
 */
 
/*** MODULEINFO
    <support_level>core</support_level>
 ***/
 
#include "asterisk.h"
 
#include "asterisk/module.h"
#include "asterisk/channel.h"
#include "asterisk/pbx.h"
#include "asterisk/utils.h"
#include "asterisk/app.h"
 
/*** DOCUMENTATION
    <function name="GROUP_COUNT" language="en_US">
        <synopsis>
            Counts the number of channels in the specified group.
        </synopsis>
        <syntax argsep="@">
            <parameter name="groupname">
                <para>Group name.</para>
            </parameter>
            <parameter name="category">
                <para>Category name</para>
            </parameter>
        </syntax>
        <description>
            <para>Calculates the group count for the specified group, or uses the
            channel's current group if not specified (and non-empty).</para>
        </description>
    </function>
    <function name="GROUP_MATCH_COUNT" language="en_US">
        <synopsis>
            Counts the number of channels in the groups matching the specified pattern.
        </synopsis>
        <syntax argsep="@">
            <parameter name="groupmatch" required="true">
                <para>A standard regular expression used to match a group name.</para>
            </parameter>
            <parameter name="category">
                <para>A standard regular expression used to match a category name.</para>
            </parameter>
        </syntax>
        <description>
            <para>Calculates the group count for all groups that match the specified pattern.
            Note: category matching is applied after matching based on group.
            Uses standard regular expression matching on both (see regex(7)).</para>
        </description>
    </function>
    <function name="GROUP" language="en_US">
        <synopsis>
            Gets or sets the channel group.
        </synopsis>
        <syntax>
            <parameter name="category">
                <para>Category name.</para>
            </parameter>
        </syntax>
        <description>
            <para><replaceable>category</replaceable> can be employed for more fine grained group management. Each channel
            can only be member of exactly one group per <replaceable>category</replaceable>.</para>
        </description>
    </function>
    <function name="GROUP_LIST" language="en_US">
        <synopsis>
            Gets a list of the groups set on a channel.
        </synopsis>
        <syntax />
        <description>
            <para>Gets a list of the groups set on a channel.</para>
        </description>
    </function>
 
 ***/
 
static int group_count_function_read(struct ast_channel *chan, const char *cmd,
                     char *data, char *buf, size_t len)
{
    int ret = -1;
    int count = -1;
    char group[80] = "", category[80] = "";
 
    if (!chan) {
        ast_log(LOG_WARNING, "No channel was provided to %s function.\n", cmd);
        return -1;
    }
 
    ast_app_group_split_group(data, group, sizeof(group), category,
                  sizeof(category));
 
    /* If no group has been provided let's find one */
    if (ast_strlen_zero(group)) {
        struct ast_group_info *gi = NULL;
 
        ast_app_group_list_rdlock();
        for (gi = ast_app_group_list_head(); gi; gi = AST_LIST_NEXT(gi, group_list)) {
            if (gi->chan != chan)
                continue;
            if (ast_strlen_zero(category) || (!ast_strlen_zero(gi->category) && !strcasecmp(gi->category, category)))
                break;
        }
        if (gi) {
            ast_copy_string(group, gi->group, sizeof(group));
            if (!ast_strlen_zero(gi->category))
                ast_copy_string(category, gi->category, sizeof(category));
        }
        ast_app_group_list_unlock();
    }
 
    if ((count = ast_app_group_get_count(group, category)) == -1) {
        ast_log(LOG_NOTICE, "No group could be found for channel '%s'\n", ast_channel_name(chan));
    } else {
        snprintf(buf, len, "%d", count);
        ret = 0;
    }
 
    return ret;
}
 
static struct ast_custom_function group_count_function = {
    .name = "GROUP_COUNT",
    .read = group_count_function_read,
    .read_max = 12,
};
 
static int group_match_count_function_read(struct ast_channel *chan,
                       const char *cmd, char *data, char *buf,
                       size_t len)
{
    char group[80] = "";
    char category[80] = "";
 
    ast_app_group_split_group(data, group, sizeof(group), category,
                  sizeof(category));
 
    if (!ast_strlen_zero(group)) {
        int count;
        count = ast_app_group_match_get_count(group, category);
        snprintf(buf, len, "%d", count);
        return 0;
    }
 
    return -1;
}
 
static struct ast_custom_function group_match_count_function = {
    .name = "GROUP_MATCH_COUNT",
    .read = group_match_count_function_read,
    .read_max = 12,
    .write = NULL,
};
 
static int group_function_read(struct ast_channel *chan, const char *cmd,
                   char *data, char *buf, size_t len)
{
    int ret = -1;
    struct ast_group_info *gi = NULL;
 
    if (!chan) {
        ast_log(LOG_WARNING, "No channel was provided to %s function.\n", cmd);
        return -1;
    }
 
    ast_app_group_list_rdlock();
 
    for (gi = ast_app_group_list_head(); gi; gi = AST_LIST_NEXT(gi, group_list)) {
        if (gi->chan != chan)
            continue;
        if (ast_strlen_zero(data))
            break;
        if (!ast_strlen_zero(gi->category) && !strcasecmp(gi->category, data))
            break;
    }
 
    if (gi) {
        ast_copy_string(buf, gi->group, len);
        ret = 0;
    }
 
    ast_app_group_list_unlock();
 
    return ret;
}
 
static int group_function_write(struct ast_channel *chan, const char *cmd,
                char *data, const char *value)
{
    char grpcat[256];
 
    if (!chan) {
        ast_log(LOG_WARNING, "No channel was provided to %s function.\n", cmd);
        return -1;
    }
 
    if (!value) {
        return -1;
    }
 
    if (!ast_strlen_zero(data)) {
        snprintf(grpcat, sizeof(grpcat), "%s@%s", value, data);
    } else {
        ast_copy_string(grpcat, value, sizeof(grpcat));
    }
 
    if (ast_app_group_set_channel(chan, grpcat))
        ast_log(LOG_WARNING,
                "Setting a group requires an argument (group name)\n");
 
    return 0;
}
 
static struct ast_custom_function group_function = {
    .name = "GROUP",
    .read = group_function_read,
    .write = group_function_write,
};
 
static int group_list_function_read(struct ast_channel *chan, const char *cmd,
                    char *data, char *buf, size_t len)
{
    struct ast_group_info *gi = NULL;
    char tmp1[1024] = "";
    char tmp2[1024] = "";
 
    if (!chan)
        return -1;
 
    ast_app_group_list_rdlock();
 
    for (gi = ast_app_group_list_head(); gi; gi = AST_LIST_NEXT(gi, group_list)) {
        if (gi->chan != chan)
            continue;
        if (!ast_strlen_zero(tmp1)) {
            ast_copy_string(tmp2, tmp1, sizeof(tmp2));
            if (!ast_strlen_zero(gi->category))
                snprintf(tmp1, sizeof(tmp1), "%s %s@%s", tmp2, gi->group, gi->category);
            else
                snprintf(tmp1, sizeof(tmp1), "%s %s", tmp2, gi->group);
        } else {
            if (!ast_strlen_zero(gi->category))
                snprintf(tmp1, sizeof(tmp1), "%s@%s", gi->group, gi->category);
            else
                snprintf(tmp1, sizeof(tmp1), "%s", gi->group);
        }
    }
 
    ast_app_group_list_unlock();
 
    ast_copy_string(buf, tmp1, len);
 
    return 0;
}
 
static struct ast_custom_function group_list_function = {
    .name = "GROUP_LIST",
    .read = group_list_function_read,
    .write = NULL,
};
 
static int unload_module(void)
{
    int res = 0;
 
    res |= ast_custom_function_unregister(&group_count_function);
    res |= ast_custom_function_unregister(&group_match_count_function);
    res |= ast_custom_function_unregister(&group_list_function);
    res |= ast_custom_function_unregister(&group_function);
 
    return res;
}
 
static int load_module(void)
{
    int res = 0;
 
    res |= ast_custom_function_register(&group_count_function);
    res |= ast_custom_function_register(&group_match_count_function);
    res |= ast_custom_function_register(&group_list_function);
    res |= ast_custom_function_register(&group_function);
 
    return res;
}
 
AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "Channel group dialplan functions");