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/* Copyright (c) 2014, 2025, 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/rpl_table_access.h"
#include <stddef.h>
#include "lex_string.h"
#include "my_dbug.h"
#include "my_inttypes.h"
#include "my_loglevel.h"
#include "my_sys.h"
#include "mysql/components/services/log_builtins.h"
#include "mysqld_error.h"
#include "sql/auth/sql_security_ctx.h"
#include "sql/current_thd.h" // my_thread_set_THR_THD
#include "sql/handler.h" // ha_rollback_trans
#include "sql/log.h"
#include "sql/sql_base.h" // close_thread_tables
#include "sql/sql_class.h" // THD
#include "sql/sql_lex.h" // Query_tables_list
#include "sql/table.h" // Table_ref
bool System_table_access::open_table(THD *thd, const LEX_CSTRING dbstr,
const LEX_CSTRING tbstr,
uint max_num_field,
enum thr_lock_type lock_type,
TABLE **table,
Open_tables_backup *backup) {
return open_table(thd, to_string(dbstr), to_string(tbstr), max_num_field,
lock_type, table, backup);
}
bool System_table_access::open_table(THD *thd, std::string dbstr,
std::string tbstr, uint max_num_field,
enum thr_lock_type lock_type,
TABLE **table,
Open_tables_backup *backup) {
Query_tables_list query_tables_list_backup;
DBUG_TRACE;
before_open(thd);
/*
We need to use new Open_tables_state in order not to be affected
by LOCK TABLES/prelocked mode.
Also in order not to break execution of current statement we also
have to backup/reset/restore Query_tables_list part of LEX, which
is accessed and updated in the process of opening and locking
tables.
*/
thd->lex->reset_n_backup_query_tables_list(&query_tables_list_backup);
thd->reset_n_backup_open_tables_state(backup,
Open_tables_state::SYSTEM_TABLES);
Table_ref tables(dbstr.c_str(), dbstr.length(), tbstr.c_str(), tbstr.length(),
tbstr.c_str(), lock_type);
tables.open_strategy = Table_ref::OPEN_IF_EXISTS;
if (!open_n_lock_single_table(thd, &tables, tables.lock_descriptor().type,
m_flags)) {
close_thread_tables(thd);
thd->restore_backup_open_tables_state(backup);
thd->lex->restore_backup_query_tables_list(&query_tables_list_backup);
if (thd->is_operating_gtid_table_implicitly)
LogErr(WARNING_LEVEL, ER_RPL_GTID_TABLE_CANNOT_OPEN, dbstr.c_str(),
tbstr.c_str());
else
my_error(ER_NO_SUCH_TABLE, MYF(0), dbstr.c_str(), tbstr.c_str());
return true;
}
if (tables.table->s->fields < max_num_field) {
/*
Safety: this can only happen if someone started the server and then
altered the table.
*/
ha_rollback_trans(thd, false);
close_thread_tables(thd);
thd->restore_backup_open_tables_state(backup);
thd->lex->restore_backup_query_tables_list(&query_tables_list_backup);
my_error(ER_COL_COUNT_DOESNT_MATCH_CORRUPTED_V2, MYF(0),
tables.table->s->db.str, tables.table->s->table_name.str,
max_num_field, tables.table->s->fields);
return true;
}
thd->lex->restore_backup_query_tables_list(&query_tables_list_backup);
*table = tables.table;
tables.table->use_all_columns();
return false;
}
bool System_table_access::close_table(THD *thd, TABLE *table,
Open_tables_backup *backup, bool error,
bool need_commit) {
Query_tables_list query_tables_list_backup;
bool res = false;
DBUG_TRACE;
if (table) {
if (error)
res = ha_rollback_trans(thd, false);
else {
/*
To make the commit not to block with global read lock set
"ignore_global_read_lock" flag to true.
*/
res = ha_commit_trans(thd, false, true);
}
if (need_commit) {
if (error)
res = ha_rollback_trans(thd, true) || res;
else {
/*
To make the commit not to block with global read lock set
"ignore_global_read_lock" flag to true.
*/
res = ha_commit_trans(thd, true, true) || res;
}
}
/*
In order not to break execution of current statement we have to
backup/reset/restore Query_tables_list part of LEX, which is
accessed and updated in the process of closing tables.
*/
thd->lex->reset_n_backup_query_tables_list(&query_tables_list_backup);
close_thread_tables(thd);
thd->lex->restore_backup_query_tables_list(&query_tables_list_backup);
thd->restore_backup_open_tables_state(backup);
}
DBUG_EXECUTE_IF("simulate_flush_commit_error", {
my_printf_error(ER_ERROR_DURING_FLUSH_LOGS,
ER_THD(thd, ER_ERROR_DURING_FLUSH_LOGS), MYF(ME_FATALERROR),
true);
LogErr(ERROR_LEVEL, ER_ERROR_DURING_FLUSH_LOG_COMMIT_PHASE, true);
return true;
});
return res;
}
THD *System_table_access::create_thd() {
THD *thd = nullptr;
thd = new THD;
thd->thread_stack = (char *)&thd;
thd->store_globals();
thd->security_context()->skip_grants();
return (thd);
}
void System_table_access::drop_thd(THD *thd) {
DBUG_TRACE;
delete thd;
current_thd = nullptr;
}
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