/* -*- mode: C++; c-basic-offset: 4; indent-tabs-mode: nil -*- */
// vim: ft=cpp:expandtab:ts=8:sw=4:softtabstop=4:
#ident "$Id$"
/*
COPYING CONDITIONS NOTICE:

  This program is free software; you can redistribute it and/or modify
  it under the terms of version 2 of the GNU General Public License as
  published by the Free Software Foundation, and provided that the
  following conditions are met:

      * Redistributions of source code must retain this COPYING
        CONDITIONS NOTICE, the COPYRIGHT NOTICE (below), the
        DISCLAIMER (below), the UNIVERSITY PATENT NOTICE (below), the
        PATENT MARKING NOTICE (below), and the PATENT RIGHTS
        GRANT (below).

      * Redistributions in binary form must reproduce this COPYING
        CONDITIONS NOTICE, the COPYRIGHT NOTICE (below), the
        DISCLAIMER (below), the UNIVERSITY PATENT NOTICE (below), the
        PATENT MARKING NOTICE (below), and the PATENT RIGHTS
        GRANT (below) in the documentation and/or other materials
        provided with the distribution.

  You should have received a copy of the GNU General Public License
  along with this program; if not, write to the Free Software
  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  02110-1301, USA.

COPYRIGHT NOTICE:

  TokuDB, Tokutek Fractal Tree Indexing Library.
  Copyright (C) 2007-2013 Tokutek, Inc.

DISCLAIMER:

  This program is distributed in the hope that it will be useful, but
  WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  General Public License for more details.

UNIVERSITY PATENT NOTICE:

  The technology is licensed by the Massachusetts Institute of
  Technology, Rutgers State University of New Jersey, and the Research
  Foundation of State University of New York at Stony Brook under
  United States of America Serial No. 11/760379 and to the patents
  and/or patent applications resulting from it.

PATENT MARKING NOTICE:

  This software is covered by US Patent No. 8,185,551.
  This software is covered by US Patent No. 8,489,638.

PATENT RIGHTS GRANT:

  "THIS IMPLEMENTATION" means the copyrightable works distributed by
  Tokutek as part of the Fractal Tree project.

  "PATENT CLAIMS" means the claims of patents that are owned or
  licensable by Tokutek, both currently or in the future; and that in
  the absence of this license would be infringed by THIS
  IMPLEMENTATION or by using or running THIS IMPLEMENTATION.

  "PATENT CHALLENGE" shall mean a challenge to the validity,
  patentability, enforceability and/or non-infringement of any of the
  PATENT CLAIMS or otherwise opposing any of the PATENT CLAIMS.

  Tokutek hereby grants to you, for the term and geographical scope of
  the PATENT CLAIMS, a non-exclusive, no-charge, royalty-free,
  irrevocable (except as stated in this section) patent license to
  make, have made, use, offer to sell, sell, import, transfer, and
  otherwise run, modify, and propagate the contents of THIS
  IMPLEMENTATION, where such license applies only to the PATENT
  CLAIMS.  This grant does not include claims that would be infringed
  only as a consequence of further modifications of THIS
  IMPLEMENTATION.  If you or your agent or licensee institute or order
  or agree to the institution of patent litigation against any entity
  (including a cross-claim or counterclaim in a lawsuit) alleging that
  THIS IMPLEMENTATION constitutes direct or contributory patent
  infringement, or inducement of patent infringement, then any rights
  granted to you under this License shall terminate as of the date
  such litigation is filed.  If you or your agent or exclusive
  licensee institute or order or agree to the institution of a PATENT
  CHALLENGE, then Tokutek may terminate any rights granted to you
  under this License.
*/

#ident "Copyright (c) 2007-2013 Tokutek Inc.  All rights reserved."
#ident "The technology is licensed by the Massachusetts Institute of Technology, Rutgers State University of New Jersey, and the Research Foundation of State University of New York at Stony Brook under United States of America Serial No. 11/760379 and to the patents and/or patent applications resulting from it."

#include <ft/log_header.h>

#include "log-internal.h"
#include "logcursor.h"
#include "checkpoint.h"

static uint64_t footprint = 0;  // for debug and accountability

uint64_t
toku_log_upgrade_get_footprint(void) {
    return footprint;
}

// Footprint concept here is that each function increments a different decimal digit.
// The cumulative total shows the path taken for the upgrade.
// Each function must have a single return for this to work.
#define FOOTPRINT(x) function_footprint=(x*footprint_increment)
#define FOOTPRINTSETUP(increment) uint64_t function_footprint = 0; uint64_t footprint_increment=increment;
#define FOOTPRINTCAPTURE footprint+=function_footprint;


// return 0 if clean shutdown, TOKUDB_UPGRADE_FAILURE if not clean shutdown
static int
verify_clean_shutdown_of_log_version_current(const char *log_dir, LSN * last_lsn, TXNID *last_xid) {
    int rval = TOKUDB_UPGRADE_FAILURE;
    TOKULOGCURSOR cursor = NULL;
    int r;
    FOOTPRINTSETUP(100);

    FOOTPRINT(1);

    r = toku_logcursor_create(&cursor, log_dir);
    assert(r == 0);
    struct log_entry *le = NULL;
    r = toku_logcursor_last(cursor, &le);
    if (r == 0) {
        FOOTPRINT(2);
        if (le->cmd==LT_shutdown) {
            LSN lsn = le->u.shutdown.lsn;
            if (last_lsn) {
                *last_lsn = lsn;
            }
            if (last_xid) {
                *last_xid = le->u.shutdown.last_xid;
            }
            rval = 0;
        }
    }
    r = toku_logcursor_destroy(&cursor);
    assert(r == 0);
    FOOTPRINTCAPTURE;
    return rval;
}


// return 0 if clean shutdown, TOKUDB_UPGRADE_FAILURE if not clean shutdown
static int
verify_clean_shutdown_of_log_version_old(const char *log_dir, LSN * last_lsn, TXNID *last_xid, uint32_t version) {
    int rval = TOKUDB_UPGRADE_FAILURE;
    int r;
    FOOTPRINTSETUP(10);

    FOOTPRINT(1);

    int n_logfiles;
    char **logfiles;
    r = toku_logger_find_logfiles(log_dir, &logfiles, &n_logfiles);
    if (r!=0) return r;

    char *basename;
    TOKULOGCURSOR cursor;
    struct log_entry *entry;
    // Only look at newest log
    // basename points to first char after last / in file pathname
    basename = strrchr(logfiles[n_logfiles-1], '/') + 1;
    uint32_t version_name;
    long long index = -1;
    r = sscanf(basename, "log%lld.tokulog%u", &index, &version_name);
    assert(r==2);  // found index and version
    invariant(version_name == version);
    assert(version>=TOKU_LOG_MIN_SUPPORTED_VERSION);
    assert(version< TOKU_LOG_VERSION); //Must be old
    // find last LSN
    r = toku_logcursor_create_for_file(&cursor, log_dir, basename);
    if (r != 0) {
        goto cleanup_no_logcursor;
    }
    r = toku_logcursor_last(cursor, &entry);
    if (r != 0) {
        goto cleanup;
    }
    FOOTPRINT(2);
    //TODO: Remove this special case once FT_LAYOUT_VERSION_19 (and older) are not supported.
    if (version <= FT_LAYOUT_VERSION_19) {
        if (entry->cmd==LT_shutdown_up_to_19) {
            LSN lsn = entry->u.shutdown_up_to_19.lsn;
            if (last_lsn) {
                *last_lsn = lsn;
            }
            if (last_xid) {
                // Use lsn as last_xid.
                *last_xid = lsn.lsn;
            }
            rval = 0;
        }
    }
    else if (entry->cmd==LT_shutdown) {
        LSN lsn = entry->u.shutdown.lsn;
        if (last_lsn) {
            *last_lsn = lsn;
        }
        if (last_xid) {
            *last_xid = entry->u.shutdown.last_xid;
        }
        rval = 0;
    }
cleanup:
    r = toku_logcursor_destroy(&cursor);
    assert(r == 0);
cleanup_no_logcursor:
    for(int i=0;i<n_logfiles;i++) {
        toku_free(logfiles[i]);
    }
    toku_free(logfiles);
    FOOTPRINTCAPTURE;
    return rval;
}


static int
verify_clean_shutdown_of_log_version(const char *log_dir, uint32_t version, LSN *last_lsn, TXNID *last_xid) {
    // return 0 if clean shutdown, TOKUDB_UPGRADE_FAILURE if not clean shutdown
    int r = 0;
    FOOTPRINTSETUP(1000);

    if (version < TOKU_LOG_VERSION)  {
        FOOTPRINT(1);
        r = verify_clean_shutdown_of_log_version_old(log_dir, last_lsn, last_xid, version);
	if (r != 0) {
	    fprintf(stderr, "Cannot upgrade TokuDB version %d database.", version);
	    fprintf(stderr, "  Previous improper shutdown detected.\n");
	}
    }
    else {
        FOOTPRINT(2);
        assert(version == TOKU_LOG_VERSION);
        r = verify_clean_shutdown_of_log_version_current(log_dir, last_lsn, last_xid);
    }
    FOOTPRINTCAPTURE;
    return r;
}


// Actually create a log file of the current version, making the environment be of the current version.
// TODO: can't fail
static int
upgrade_log(const char *env_dir, const char *log_dir, LSN last_lsn, TXNID last_xid) { // the real deal
    int r;
    FOOTPRINTSETUP(10000);

    LSN initial_lsn = last_lsn;
    initial_lsn.lsn++;
    CACHETABLE ct;
    TOKULOGGER logger;

    FOOTPRINT(1);

    { //Create temporary environment
        toku_cachetable_create(&ct, 1<<25, initial_lsn, NULL);
        toku_cachetable_set_env_dir(ct, env_dir);
        r = toku_logger_create(&logger);
        assert(r == 0);
        toku_logger_set_cachetable(logger, ct);
        r = toku_logger_open_with_last_xid(log_dir, logger, last_xid);
        assert(r==0);
    }
    { //Checkpoint
        CHECKPOINTER cp = toku_cachetable_get_checkpointer(ct);
        r = toku_checkpoint(cp, logger, NULL, NULL, NULL, NULL, UPGRADE_CHECKPOINT); //fsyncs log dir
        assert(r == 0);
    }
    { //Close cachetable and logger
        toku_logger_shutdown(logger);
        toku_cachetable_close(&ct);
        r = toku_logger_close(&logger);
        assert(r==0);
    }
    {
        r = verify_clean_shutdown_of_log_version(log_dir, TOKU_LOG_VERSION, NULL, NULL);
        assert(r==0);
    }
    FOOTPRINTCAPTURE;
    return 0;
}

// If log on disk is old (environment is old) and clean shutdown, then create log of current version,
// which will make the environment of the current version (and delete the old logs).
int
toku_maybe_upgrade_log(const char *env_dir, const char *log_dir, LSN * lsn_of_clean_shutdown, bool * upgrade_in_progress) {
    int r;
    int lockfd = -1;
    FOOTPRINTSETUP(100000);

    footprint = 0;
    *upgrade_in_progress = false;  // set true only if all criteria are met and we're actually doing an upgrade

    FOOTPRINT(1);
    r = toku_recover_lock(log_dir, &lockfd);
    if (r != 0) {
        goto cleanup_no_lock;
    }
    FOOTPRINT(2);
    assert(log_dir);
    assert(env_dir);

    uint32_t version_of_logs_on_disk;
    bool found_any_logs;
    r = toku_get_version_of_logs_on_disk(log_dir, &found_any_logs, &version_of_logs_on_disk);
    if (r != 0) {
        goto cleanup;
    }
    FOOTPRINT(3);
    if (!found_any_logs)
        r = 0; //No logs means no logs to upgrade.
    else if (version_of_logs_on_disk > TOKU_LOG_VERSION)
        r = TOKUDB_DICTIONARY_TOO_NEW;
    else if (version_of_logs_on_disk < TOKU_LOG_MIN_SUPPORTED_VERSION)
        r = TOKUDB_DICTIONARY_TOO_OLD;
    else if (version_of_logs_on_disk == TOKU_LOG_VERSION)
        r = 0; //Logs are up to date
    else {
        FOOTPRINT(4);
        LSN last_lsn;
        TXNID last_xid;
        r = verify_clean_shutdown_of_log_version(log_dir, version_of_logs_on_disk, &last_lsn, &last_xid);
        if (r != 0) {
            goto cleanup;
        }
        FOOTPRINT(5);
        *lsn_of_clean_shutdown = last_lsn;
        *upgrade_in_progress = true;
        r = upgrade_log(env_dir, log_dir, last_lsn, last_xid);
    }
cleanup:
    {
        //Clean up
        int rc;
        rc = toku_recover_unlock(lockfd);
        if (r==0) r = rc;
    }
cleanup_no_lock:
    FOOTPRINTCAPTURE;
    return r;
}