/*
   Copyright (c) 2016 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 "glusterd.h"
#include "glusterd-utils.h"
#include "glusterd-gfproxyd-svc-helper.h"
#include "glusterd-messages.h"
#include <glusterfs/syscall.h>
#include "glusterd-volgen.h"

void
glusterd_svc_build_gfproxyd_rundir(glusterd_volinfo_t *volinfo, char *path,
                                   int path_len)
{
    char workdir[PATH_MAX] = {
        0,
    };
    glusterd_conf_t *priv = THIS->private;

    GLUSTERD_GET_VOLUME_PID_DIR(workdir, volinfo, priv);

    snprintf(path, path_len, "%s", workdir);
}

void
glusterd_svc_build_gfproxyd_socket_filepath(glusterd_volinfo_t *volinfo,
                                            char *path, int path_len)
{
    char sockfilepath[PATH_MAX] = {
        0,
    };
    char rundir[PATH_MAX] = {
        0,
    };
    int32_t len = 0;

    glusterd_svc_build_gfproxyd_rundir(volinfo, rundir, sizeof(rundir));
    len = snprintf(sockfilepath, sizeof(sockfilepath), "%s/run-%s", rundir,
                   uuid_utoa(MY_UUID));
    if ((len < 0) || (len >= sizeof(sockfilepath))) {
        sockfilepath[0] = 0;
    }

    glusterd_set_socket_filepath(sockfilepath, path, path_len);
}

void
glusterd_svc_build_gfproxyd_pidfile(glusterd_volinfo_t *volinfo, char *path,
                                    int path_len)
{
    char rundir[PATH_MAX] = {
        0,
    };

    glusterd_svc_build_gfproxyd_rundir(volinfo, rundir, sizeof(rundir));

    snprintf(path, path_len, "%s/%s.gfproxyd.pid", rundir, volinfo->volname);
}

void
glusterd_svc_build_gfproxyd_volfile_path(glusterd_volinfo_t *volinfo,
                                         char *path, int path_len)
{
    char workdir[PATH_MAX] = {
        0,
    };
    glusterd_conf_t *priv = THIS->private;

    GLUSTERD_GET_VOLUME_DIR(workdir, volinfo, priv);

    snprintf(path, path_len, "%s/%s.gfproxyd.vol", workdir, volinfo->volname);
}

void
glusterd_svc_build_gfproxyd_logdir(char *logdir, char *volname, size_t len)
{
    snprintf(logdir, len, "%s/gfproxy/%s", DEFAULT_LOG_FILE_DIRECTORY, volname);
}

void
glusterd_svc_build_gfproxyd_logfile(char *logfile, char *logdir, size_t len)
{
    snprintf(logfile, len, "%s/gfproxyd.log", logdir);
}

int
glusterd_is_gfproxyd_enabled(glusterd_volinfo_t *volinfo)
{
    return glusterd_volinfo_get_boolean(volinfo, VKEY_CONFIG_GFPROXY);
}

static int
glusterd_svc_get_gfproxyd_volfile(glusterd_volinfo_t *volinfo, char *svc_name,
                                  char *orgvol, char **tmpvol, int path_len)
{
    int tmp_fd = -1;
    int ret = -1;
    int need_unlink = 0;

    glusterd_svc_build_gfproxyd_volfile_path(volinfo, orgvol, path_len);

    ret = gf_asprintf(tmpvol, "/tmp/g%s-XXXXXX", svc_name);
    if (ret < 0) {
        goto out;
    }

    /* coverity[SECURE_TEMP] mkstemp uses 0600 as the mode and is safe */
    tmp_fd = mkstemp(*tmpvol);
    if (tmp_fd < 0) {
        gf_msg("glusterd", GF_LOG_WARNING, errno, GD_MSG_FILE_OP_FAILED,
               "Unable to create temp file"
               " %s:(%s)",
               *tmpvol, strerror(errno));
        ret = -1;
        goto out;
    }

    need_unlink = 1;
    ret = glusterd_build_gfproxyd_volfile(volinfo, *tmpvol);
out:
    if (need_unlink && ret < 0)
        sys_unlink(*tmpvol);

    if ((ret < 0) && (*tmpvol != NULL)) {
        GF_FREE(*tmpvol);
        *tmpvol = NULL;
    }

    if (tmp_fd >= 0)
        sys_close(tmp_fd);

    return ret;
}

int
glusterd_svc_check_gfproxyd_volfile_identical(char *svc_name,
                                              glusterd_volinfo_t *volinfo,
                                              gf_boolean_t *identical)
{
    char orgvol[PATH_MAX] = {
        0,
    };
    char *tmpvol = NULL;
    int ret = -1;
    int need_unlink = 0;

    GF_VALIDATE_OR_GOTO("glusterd", identical, out);

    ret = glusterd_svc_get_gfproxyd_volfile(volinfo, svc_name, orgvol, &tmpvol,
                                            PATH_MAX);
    if (ret)
        goto out;

    need_unlink = 1;
    ret = glusterd_check_files_identical(orgvol, tmpvol, identical);
    if (ret)
        goto out;

out:
    if (need_unlink)
        sys_unlink(tmpvol);

    if (tmpvol != NULL)
        GF_FREE(tmpvol);

    return ret;
}

int
glusterd_svc_check_gfproxyd_topology_identical(char *svc_name,
                                               glusterd_volinfo_t *volinfo,
                                               gf_boolean_t *identical)
{
    char orgvol[PATH_MAX] = {
        0,
    };
    char *tmpvol = NULL;
    int ret = -1;
    int tmpclean = 0;

    GF_VALIDATE_OR_GOTO("glusterd", identical, out);

    ret = glusterd_svc_get_gfproxyd_volfile(volinfo, svc_name, orgvol, &tmpvol,
                                            PATH_MAX);
    if (ret)
        goto out;

    tmpclean = 1; /* SET the flag to unlink() tmpfile */

    /* Compare the topology of volfiles */
    ret = glusterd_check_topology_identical(orgvol, tmpvol, identical);
out:
    if (tmpclean)
        sys_unlink(tmpvol);

    if (tmpvol != NULL)
        GF_FREE(tmpvol);

    return ret;
}

glusterd_volinfo_t *
glusterd_gfproxyd_volinfo_from_svc(glusterd_svc_t *svc)
{
    glusterd_volinfo_t *volinfo = NULL;
    glusterd_gfproxydsvc_t *gfproxyd = NULL;

    /* Get volinfo->gfproxyd from svc object */
    gfproxyd = cds_list_entry(svc, glusterd_gfproxydsvc_t, svc);
    if (!gfproxyd) {
        gf_msg("glusterd", GF_LOG_ERROR, 0, GD_MSG_SNAPD_OBJ_GET_FAIL,
               "Failed to get gfproxyd "
               "object from gfproxyd service");
        goto out;
    }

    /* Get volinfo from gfproxyd */
    volinfo = cds_list_entry(gfproxyd, glusterd_volinfo_t, gfproxyd);
    if (!volinfo) {
        gf_msg("glusterd", GF_LOG_ERROR, 0, GD_MSG_VOLINFO_GET_FAIL,
               "Failed to get volinfo from "
               "from gfproxyd");
        goto out;
    }
out:
    return volinfo;
}