/*
   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,
    };

    ret = gf_changelog_init(NULL);
    if (ret) {
        handle_error("Init failed");
        goto out;
    }

    /* get changes for brick "/home/vshankar/export/yow/yow-1" */
    ret = gf_changelog_register("/export/z1/zwoop", "/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;
}