/* Copyright (c) 2023, 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/statement/statement_runnable.h"

#include "mysql/psi/mysql_ps.h" // MYSQL_EXECUTE_PS

#include "sql/sp_head.h"

#include "sql/sp_rcontext.h"

#include "sql/sql_class.h"

#include "sql/sql_digest_stream.h"

#include "sql/sql_lex.h"

#include "sql/sql_parse.h" // sql_command_flags

#include "sql/statement/utils.h"

Server_runnable::~Server_runnable() = default;

Statement_runnable::Statement_runnable(LEX_STRING sql_text)

: m_sql_text(sql_text) {}

/**

Parse and execute a statement. Does not prepare the query.

Allows to execute a statement from within another statement.

Supports even executing a statement from within stored program.

The main property of the implementation is that it does not

affect the environment -- i.e. you can run many

executions without having to cleanup/reset THD in between.

*/

bool Statement_runnable::execute_server_code(THD *thd) {

sql_digest_state *parent_digest;

PSI_statement_locker *parent_locker;

if (alloc_query(thd, m_sql_text.str, m_sql_text.length)) return true;

Parser_state parser_state;

if (parser_state.init(thd, thd->query().str, thd->query().length)) {

// OOM

return true; /* purecov: inspected */

}

parser_state.m_lip.multi_statements = false;

lex_start(thd);

const bool executing_statement_under_stored_program =

(thd->sp_runtime_ctx != nullptr);

if (executing_statement_under_stored_program) {

thd->lex->sphead = thd->sp_runtime_ctx->sp;

/*

Make sure that we are not here while parsing a statement under stored

program. In other words, Execute_regular_statement::execute() and

Ed_connection::execute_direct() should not be invoked while parsing

another SP statement.

*/

assert(thd->lex->get_sp_current_parsing_ctx() == nullptr);

}

parent_digest = thd->m_digest;

parent_locker = thd->m_statement_psi;

thd->m_digest = nullptr;

thd->m_statement_psi = nullptr;

bool error = parse_sql(thd, &parser_state, nullptr) || thd->is_error();

thd->m_digest = parent_digest;

thd->m_statement_psi = parent_locker;

if (error) goto end;

/*

Make sure that no new stored program is created while executed statement

under stored program. CREATE/ALTER/DROP SP under stored program are

restricted.

*/

assert(!executing_statement_under_stored_program ||

thd->lex->sphead == thd->sp_runtime_ctx->sp);

// Set multi-result state if statement belongs to SP.

if (executing_statement_under_stored_program) {

error = set_sp_multi_result_state(thd, thd->lex);

if (error) goto end;

}

thd->lex->set_trg_event_type_for_tables();

parent_locker = thd->m_statement_psi;

thd->m_statement_psi = nullptr;

/*

Rewrite first, execution might replace passwords

with hashes in situ without flagging it, and then we'd make

a hash of that hash.

*/

rewrite_query(thd);

log_execute_line(thd);

set_query_for_display(thd);

error = mysql_execute_command(thd);

thd->m_statement_psi = parent_locker;

end:

/*

lex_end() would free sphead. Don't free sphead which invoked this

statement.

*/

if (executing_statement_under_stored_program) {

assert(thd->lex->sphead == thd->sp_runtime_ctx->sp);

thd->lex->sphead = nullptr;

}

lex_end(thd->lex);

return error;

}