/*
   Copyright (c) 2006-2018 Red Hat, Inc. <http://www.redhat.com>
   This file is part of GlusterFS.

   This file is licensed to you under your choice of the GNU Lesser
   General Public License, version 3 or any later version (LGPLv3 or
   later), or the GNU General Public License, version 2 (GPLv2), in all
   cases as published by the Free Software Foundation.
*/
#include "template.h"
#include <glusterfs/statedump.h>

static int32_t
template_mem_acct_init(xlator_t *this)
{
    int ret = -1;

    GF_VALIDATE_OR_GOTO("template", this, out);

    ret = xlator_mem_acct_init(this, gf_template_mt_end + 1);

    if (ret != 0) {
        gf_msg(this->name, GF_LOG_ERROR, ENOMEM, TEMPLATE_MSG_NO_MEMORY,
               "Memory accounting init failed");
        goto out;
    }

    ret = 0;
out:
    return ret;
}

static int32_t
template_priv_to_dict(xlator_t *this, dict_t *dict, char *brickname)
{
    int ret = 0;
    template_private_t *priv = NULL;

    priv = this->private;
    ret = dict_set_uint64(dict, "template.dummy", priv->dummy);
    if (ret)
        gf_msg_debug(this->name, ENOMEM, "dict_set of dummy key failed");

    return 0;
}

static int32_t
template_priv(xlator_t *this)
{
    template_private_t *priv = NULL;

    priv = this->private;
    gf_proc_dump_write("template.dummy", "%" PRId32, priv->dummy);

    return 0;
}

static int32_t
template_dump_metrics(xlator_t *this, int fd)
{
    template_private_t *priv = NULL;

    priv = this->private;
    /* NOTE: currently this is adding private variable, which can
       be constant here. But in reality, things which are changing
       can be added here, so we get to plot them on graph. */
    dprintf(fd, "%s.private.dummy %d\n", this->name, priv->dummy);

    return 0;
}

static int32_t
template_init(xlator_t *this)
{
    int ret = -1;
    template_private_t *priv = NULL;

    if (!this->children || this->children->next) {
        gf_msg(this->name, GF_LOG_ERROR, EINVAL, TEMPLATE_MSG_NO_GRAPH,
               "not configured with exactly one child. exiting");
        goto out;
    }

    if (!this->parents) {
        gf_msg(this->name, GF_LOG_ERROR, EINVAL, TEMPLATE_MSG_NO_GRAPH,
               "dangling volume. check volfile ");
        goto out;
    }

    priv = GF_CALLOC(1, sizeof(template_private_t), gf_template_mt_private_t);
    if (!priv) {
        gf_msg(this->name, GF_LOG_ERROR, ENOMEM, TEMPLATE_MSG_NO_MEMORY,
               "priv allocation failed");
        goto out;
    }

    GF_OPTION_INIT("dummy", priv->dummy, int32, out);

    this->private = priv;
    priv = NULL;
    ret = 0;

out:
    if (priv)
        GF_FREE(priv);

    return ret;
}

static int
template_reconfigure(xlator_t *this, dict_t *options)
{
    int ret = -1;
    template_private_t *priv = NULL;

    priv = this->private;

    GF_OPTION_RECONF("dummy", priv->dummy, options, int32, out);

    ret = 0;
out:
    return ret;
}

static void
template_fini(xlator_t *this)
{
    template_private_t *priv = NULL;

    priv = this->private;
    this->private = NULL;

    GF_FREE(priv);
}

static int
template_notify(xlator_t *this, int32_t event, void *data, ...)
{
    switch (event) {
        default:
            default_notify(this, event, data);
            gf_msg_debug(this->name, 0, "event %d received", event);
    }

    return 0;
}

struct xlator_fops template_fops = {};

struct xlator_cbks template_cbks = {};

struct xlator_dumpops template_dumpops = {
    .priv = template_priv,
    .priv_to_dict = template_priv_to_dict,
};

struct volume_options template_options[] = {
    {
        .key = {"dummy"},
        .type = GF_OPTION_TYPE_INT,
        .min = 1,
        .max = 1024,
        .default_value = "1",
        .description = "a dummy option to show how to set the option",
        .op_version = {GD_OP_VERSION_5_0},
        .flags = OPT_FLAG_SETTABLE | OPT_FLAG_DOC,
        .level = OPT_STATUS_EXPERIMENTAL,
        .tags = {"development", "experimental", "template"},
    },
    {.key = {NULL}},
};

xlator_api_t xlator_api = {
    .init = template_init,
    .fini = template_fini,
    .notify = template_notify,
    .reconfigure = template_reconfigure,
    .mem_acct_init = template_mem_acct_init,
    .dump_metrics = template_dump_metrics,
    .op_version = {GD_OP_VERSION_5_0},
    .dumpops = &template_dumpops,
    .fops = &template_fops,
    .cbks = &template_cbks,
    .options = template_options,
    .identifier = "template",
};