dd_utility.cc

/* Copyright (c) 2018, 2024, Oracle and/or its affiliates.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License, version 2.0,
   as published by the Free Software Foundation.

   This program is designed to work with certain software (including
   but not limited to OpenSSL) that is licensed under separate terms,
   as designated in a particular file or component or in included license
   documentation.  The authors of MySQL hereby grant you an additional
   permission to link the program and your derivative works with the
   separately licensed software that they have either included with
   the program or referenced in the documentation.

   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, version 2.0, for more details.

   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 St, Fifth Floor, Boston, MA 02110-1301  USA */

#include "sql/dd/dd_utility.h"

#include "mysql/components/services/log_builtins.h"  // LogErr
#include "mysql/strings/m_ctype.h"
#include "mysqld_error.h"  // ER_...
#include "sql/handler.h"   // handlerton

namespace dd {

///////////////////////////////////////////////////////////////////////////

size_t normalize_string(const CHARSET_INFO *cs, const String_type &src,
                        char *normalized_str_buf,
                        size_t normalized_str_buf_length) {
  /*
    Count exact number of characters in the string and adjust output buffer
    size according to it to avoid my_strnxfrm() padding result buffer with
    spaces(sort weights corresponding to spaces).
  */
  size_t len = cs->coll->strnxfrmlen(
      cs, (cs->mbmaxlen *
           cs->cset->numchars(cs, src.c_str(), src.c_str() + src.length())));
  if (len > normalized_str_buf_length) return 0;

  /*
    Normalize the src.
    Store weights corresponding to each character of "src" in the result
    buffer.
  */
  my_strnxfrm(cs, reinterpret_cast<uchar *>(normalized_str_buf), len,
              reinterpret_cast<const uchar *>(src.c_str()), src.length());

  return len;
}

bool check_if_server_ddse_readonly(THD *thd, const char *schema_name_abbrev) {
  /*
    We must check if the DDSE is started in a way that makes the DD
    read only. For now, we only support InnoDB as SE for the DD. The call
    to retrieve the handlerton for the DDSE should be replaced by a more
    generic mechanism.
  */
  handlerton *ddse = ha_resolve_by_legacy_type(thd, DB_TYPE_INNODB);
  if (ddse->is_dict_readonly && ddse->is_dict_readonly()) {
    LogErr(WARNING_LEVEL, ER_SKIP_UPDATING_METADATA_IN_SE_RO_MODE,
           schema_name_abbrev);
    return true;
  }

  return false;
}

///////////////////////////////////////////////////////////////////////////

}  // namespace dd