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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/dd/impl/utils.h"
#include <string>
#include "lex_string.h"
#include "m_ctype.h" // CHARSET_INFO
#include "m_string.h"
#include "my_time.h" // TIME_to_ulonglong_datetime
#include "mysql/components/services/log_builtins.h" // LogErr
#include "mysql_com.h" // NAME_LEN
#include "sql/dd/impl/bootstrap/bootstrap_ctx.h" // DD_bootstrap_ctx
#include "sql/dd/properties.h" // dd::Properties
#include "sql/sql_base.h" // close_thread_tables
#include "sql/sql_prepare.h" // Ed_connection
#include "sql/stateless_allocator.h"
#include "sql/strfunc.h"
#include "sql/transaction.h" // trans_rollback
namespace dd {
// Execute a single SQL query.
bool execute_query(THD *thd, const dd::String_type &q_buf) {
Ed_connection con(thd);
LEX_STRING str;
lex_string_strmake(thd->mem_root, &str, q_buf.c_str(), q_buf.length());
if (con.execute_direct(str)) {
// Report error to log file during bootstrap.
if (dd::bootstrap::DD_bootstrap_ctx::instance().get_stage() <
dd::bootstrap::Stage::FINISHED) {
LogErr(ERROR_LEVEL, ER_DD_INITIALIZE_SQL_ERROR, q_buf.c_str(),
con.get_last_errno(), con.get_last_error());
}
return true;
}
return false;
}
///////////////////////////////////////////////////////////////////////////
void escape(String_type *sp, const String_type &src) {
const String_type::const_iterator src_end = src.end();
for (String_type::const_iterator s = src.begin(); s != src_end; ++s) {
if (*s == '\\' || *s == '=' || *s == ';') {
sp->append(1, '\\');
}
sp->append(1, *s);
}
}
///////////////////////////////////////////////////////////////////////////
bool unescape(String_type &dest) {
String_type tmp_dest;
for (String_type::iterator d = dest.begin(); d != dest.end(); d++) {
if (*d == '\\') {
// An escape character preceding end is an error, it must be followed
// by an escapable character.
if ((d + 1) != dest.end() &&
(*(d + 1) == '\\' || *(d + 1) == '=' || *(d + 1) == ';'))
d++;
else
return true;
}
tmp_dest.push_back(*d);
}
dest = tmp_dest;
return false;
}
///////////////////////////////////////////////////////////////////////////
bool eat_to(String_type::const_iterator &it, String_type::const_iterator end,
char c) {
// Verify valid stop characters
if (c != '=' && c != ';') return true;
// Loop until end of string or stop character
while (it != end && *it != c) {
// Unexpected unescaped stop character is an error
if ((*it == '=' && c == ';') || (*it == ';' && c == '=')) return true;
// The escape character must be succeeded by an escapable character
if (*it == '\\') {
it++;
// Hitting end here is an error, we must have an escapable character
if (it == end || (*it != '\\' && *it != '=' && *it != ';')) return true;
}
// Advance iterator, also after finding an escapable character
it++;
}
// Hitting end searching for ';' is ok; if searching for '=', it is not
return (it == end && c == '=');
}
///////////////////////////////////////////////////////////////////////////
bool eat_str(String_type &dest, String_type::const_iterator &it,
String_type::const_iterator end, char c) {
// Save starting point for later copying
String_type::const_iterator start = it;
// Find the first unescaped occurrence of c, or the end
if (eat_to(it, end, c)) return true;
// Create destination string up to, but not including c
dest = String_type(start, it);
// Remove escape characters
if (unescape(dest)) return true;
// Make iterator point to character after c or at the end of the string
if (it != end) it++;
return false;
}
///////////////////////////////////////////////////////////////////////////
bool eat_pairs(String_type::const_iterator &it, String_type::const_iterator end,
dd::Properties *props) {
String_type key("");
String_type val("");
if (it == end) return false;
if (eat_str(key, it, end, '=') || eat_str(val, it, end, ';')) return true;
// Empty keys are rejected, empty values are ok
if (key == "") return true;
// Silently skip invalid keys.
if (props->valid_key(key)) props->set(key, val);
return eat_pairs(it, end, props);
}
///////////////////////////////////////////////////////////////////////////
ulonglong my_time_t_to_ull_datetime(my_time_t seconds_since_epoch) {
MYSQL_TIME curtime;
my_tz_OFFSET0->gmt_sec_to_TIME(&curtime, seconds_since_epoch);
return TIME_to_ulonglong_datetime(curtime);
}
///////////////////////////////////////////////////////////////////////////
bool is_string_in_lowercase(const String_type &str, const CHARSET_INFO *cs) {
char lowercase_str_buf[NAME_LEN + 1];
my_stpcpy(lowercase_str_buf, str.c_str());
my_casedn_str(cs, lowercase_str_buf);
return (memcmp(str.c_str(), lowercase_str_buf, str.length()) == 0);
}
///////////////////////////////////////////////////////////////////////////
// Helper function to do rollback or commit, depending on error.
bool end_transaction(THD *thd, bool error) {
if (error) {
// Rollback the statement before we can rollback the real transaction.
trans_rollback_stmt(thd);
trans_rollback(thd);
} else if (trans_commit_stmt(thd) || trans_commit(thd)) {
error = true;
trans_rollback(thd);
}
// Close tables etc. and release MDL locks, regardless of error.
close_thread_tables(thd);
thd->mdl_context.release_transactional_locks();
return error;
}
} // namespace dd
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