/*
   Copyright (c) 2013 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.
*/

/**
 * get set of new changes every 10 seconds (just print the file names)
 *
 * Compile it using:
 *  gcc -o getchanges `pkg-config --cflags libgfchangelog` get-changes.c \
 *  `pkg-config --libs libgfchangelog`
 */

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/un.h>
#include <limits.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <errno.h>

#include "changelog.h"

#define handle_error(fn)                                \
        printf ("%s (reason: %s)\n", fn, strerror (errno))

int
main (int argc, char ** argv)
{
        int     i           = 0;
        int     ret         = 0;
        ssize_t nr_changes  = 0;
        ssize_t changes     = 0;
        char fbuf[PATH_MAX] = {0,};

        /* get changes for brick "/home/vshankar/export/yow/yow-1" */
        ret = gf_changelog_register ("/home/vshankar/export/yow/yow-1",
                                     "/tmp/scratch", "/tmp/change.log", 9, 5);
        if (ret) {
                handle_error ("register failed");
                goto out;
        }

        while (1) {
                i = 0;
                nr_changes = gf_changelog_scan ();
                if (nr_changes < 0) {
                        handle_error ("scan(): ");
                        break;
                }

                if (nr_changes == 0)
                        goto next;

                printf ("Got %ld changelog files\n", nr_changes);

                while ( (changes =
                         gf_changelog_next_change (fbuf, PATH_MAX)) > 0) {
                        printf ("changelog file [%d]: %s\n", ++i, fbuf);

                        /* process changelog */
                        /* ... */
                        /* ... */
                        /* ... */
                        /* done processing */

                        ret = gf_changelog_done (fbuf);
                        if (ret)
                                handle_error ("gf_changelog_done");
                }

                if (changes == -1)
                        handle_error ("gf_changelog_next_change");

        next:
                sleep (10);
        }

 out:
        return ret;
}