1062 lines
36 KiB
C++
1062 lines
36 KiB
C++
/**
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* @section LICENCE
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*
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* This file is distributed as part of the SkySQL Gateway. It is
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* free software: you can redistribute it and/or modify it under
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* the terms of the GNU General Public License as published by the
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* Free Software Foundation, version 2.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301 USA.
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*
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* Copyright SkySQL Ab
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*
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* @file
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*
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*/
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#define EMBEDDED_LIBRARY
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#define MYSQL_YACC
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#define MYSQL_LEX012
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#define MYSQL_SERVER
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#if defined(MYSQL_CLIENT)
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# undef MYSQL_CLIENT
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#endif
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#include <query_classifier.h>
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#include "../utils/skygw_types.h"
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#include "../utils/skygw_debug.h"
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#include <log_manager.h>
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#include <mysql_client_server_protocol.h>
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#include <mysql.h>
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#include <my_sys.h>
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#include <my_global.h>
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#include <my_dbug.h>
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#include <my_base.h>
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#include <sql_list.h>
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#include <mysqld_error.h>
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#include <sql_class.h>
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#include <sql_lex.h>
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#include <embedded_priv.h>
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#include <sql_class.h>
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#include <sql_lex.h>
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#include <sql_parse.h>
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#include <errmsg.h>
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#include <client_settings.h>
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#include <set_var.h>
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#include <strfunc.h>
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#include <item_func.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <stdarg.h>
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extern int lm_enabled_logfiles_bitmask;
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#define QTYPE_LESS_RESTRICTIVE_THAN_WRITE(t) (t<QUERY_TYPE_WRITE ? true : false)
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static THD* get_or_create_thd_for_parsing(
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MYSQL* mysql,
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char* query_str);
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static unsigned long set_client_flags(
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MYSQL* mysql);
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static bool create_parse_tree(
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THD* thd);
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static skygw_query_type_t resolve_query_type(
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THD* thd);
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static bool skygw_stmt_causes_implicit_commit(
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LEX* lex,
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int* autocommit_stmt);
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static int is_autocommit_stmt(
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LEX* lex);
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static void parsing_info_set_plain_str(void* ptr,
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char* str);
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/**
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* Calls parser for the query includede in the buffer. Creates and adds parsing
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* information to buffer if it doesn't exist already. Resolves the query type.
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*
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* @param querybuf buffer including the query and possibly the parsing information
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*
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* @return query type
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*/
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skygw_query_type_t query_classifier_get_type(
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GWBUF* querybuf)
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{
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MYSQL* mysql;
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skygw_query_type_t qtype = QUERY_TYPE_UNKNOWN;
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bool succp;
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ss_info_dassert(querybuf != NULL, ("querybuf is NULL"));
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/** Create parsing info for the query and store it to buffer */
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succp = query_is_parsed(querybuf);
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if (!succp)
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{
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succp = parse_query(querybuf);
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}
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/** Read thd pointer and resolve the query type with it. */
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if (succp)
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{
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parsing_info_t* pi;
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pi = (parsing_info_t*)gwbuf_get_buffer_object_data(querybuf,
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GWBUF_PARSING_INFO);
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if (pi != NULL)
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{
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mysql = (MYSQL *)pi->pi_handle;
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/** Find out the query type */
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if (mysql != NULL)
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{
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qtype = resolve_query_type((THD *)mysql->thd);
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}
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}
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}
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return qtype;
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}
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/**
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* Create parsing info and try to parse the query included in the query buffer.
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* Store pointer to created parse_tree_t object to buffer.
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*
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* @param querybuf buffer including the query and possibly the parsing information
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*
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* @return true if succeed, false otherwise
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*/
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bool parse_query (
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GWBUF* querybuf)
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{
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bool succp;
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THD* thd;
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uint8_t* data;
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size_t len;
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char* query_str;
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parsing_info_t* pi;
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CHK_GWBUF(querybuf);
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/** Do not parse without releasing previous parse info first */
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ss_dassert(!query_is_parsed(querybuf));
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if (query_is_parsed(querybuf))
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{
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return false;
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}
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/** Create parsing info */
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pi = parsing_info_init(parsing_info_done);
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if (pi == NULL)
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{
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succp = false;
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goto retblock;
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}
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/** Extract query and copy it to different buffer */
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data = (uint8_t*)GWBUF_DATA(querybuf);
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len = MYSQL_GET_PACKET_LEN(data)-1; /*< distract 1 for packet type byte */
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query_str = (char *)malloc(len+1);
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if (query_str == NULL)
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{
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/** Free parsing info data */
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parsing_info_done(pi);
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succp = false;
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goto retblock;
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}
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memcpy(query_str, &data[5], len);
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memset(&query_str[len], 0, 1);
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parsing_info_set_plain_str(pi, query_str);
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/** Get one or create new THD object to be use in parsing */
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thd = get_or_create_thd_for_parsing((MYSQL *)pi->pi_handle, query_str);
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if (thd == NULL)
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{
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/** Free parsing info data */
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parsing_info_done(pi);
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succp = false;
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goto retblock;
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}
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/**
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* Create parse_tree inside thd.
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* thd and lex are readable even if creating parse tree fails.
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*/
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create_parse_tree(thd);
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/** Add complete parsing info struct to the query buffer */
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gwbuf_add_buffer_object(querybuf,
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GWBUF_PARSING_INFO,
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(void *)pi,
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parsing_info_done);
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succp = true;
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retblock:
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return succp;
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}
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/**
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* If buffer has non-NULL gwbuf_parsing_info it is parsed and it has parsing
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* information included.
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*
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* @param buf buffer being examined
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*
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* @return true or false
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*/
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bool query_is_parsed(
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GWBUF* buf)
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{
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CHK_GWBUF(buf);
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return GWBUF_IS_PARSED(buf);
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}
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/**
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* Create a thread context, thd, init embedded server, connect to it, and allocate
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* query to thd.
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*
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* Parameters:
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* @param mysql Database handle
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*
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* @param query_str Query in plain txt string
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*
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* @return Thread context pointer
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*
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*/
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static THD* get_or_create_thd_for_parsing(
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MYSQL* mysql,
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char* query_str)
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{
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THD* thd = NULL;
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unsigned long client_flags;
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char* db = mysql->options.db;
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bool failp = FALSE;
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size_t query_len;
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ss_info_dassert(mysql != NULL, ("mysql is NULL"));
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ss_info_dassert(query_str != NULL, ("query_str is NULL"));
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query_len = strlen(query_str);
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client_flags = set_client_flags(mysql);
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/** Get THD.
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* NOTE: Instead of creating new every time, THD instance could
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* be get from a pool of them.
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*/
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thd = (THD *)create_embedded_thd(client_flags);
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if (thd == NULL) {
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LOGIF(LE, (skygw_log_write_flush(
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LOGFILE_ERROR,
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"Error : Failed to create thread context for parsing. "
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"Exiting.")));
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goto return_thd;
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}
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mysql->thd = thd;
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init_embedded_mysql(mysql, client_flags);
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failp = check_embedded_connection(mysql, db);
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if (failp) {
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LOGIF(LE, (skygw_log_write_flush(
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LOGFILE_ERROR,
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"Error : Call to check_embedded_connection failed. "
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"Exiting.")));
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goto return_err_with_thd;
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}
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thd->clear_data_list();
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/** Check that we are calling the client functions in right order */
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if (mysql->status != MYSQL_STATUS_READY) {
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set_mysql_error(mysql, CR_COMMANDS_OUT_OF_SYNC, unknown_sqlstate);
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LOGIF(LE, (skygw_log_write_flush(
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LOGFILE_ERROR,
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"Error : Invalid status %d in embedded server. "
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"Exiting.")));
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goto return_err_with_thd;
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}
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/** Clear result variables */
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thd->current_stmt= NULL;
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thd->store_globals();
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/**
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* We have to call free_old_query before we start to fill mysql->fields
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* for new query. In the case of embedded server we collect field data
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* during query execution (not during data retrieval as it is in remote
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* client). So we have to call free_old_query here
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*/
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free_old_query(mysql);
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thd->extra_length = query_len;
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thd->extra_data = query_str;
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alloc_query(thd, query_str, query_len);
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goto return_thd;
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return_err_with_thd:
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(*mysql->methods->free_embedded_thd)(mysql);
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thd = 0;
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mysql->thd = 0;
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return_thd:
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return thd;
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}
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/**
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* @node Set client flags. This is copied from libmysqld.c:mysql_real_connect
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*
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* Parameters:
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* @param mysql - <usage>
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* <description>
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*
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* @return
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*
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*
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* @details (write detailed description here)
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*
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*/
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static unsigned long set_client_flags(
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MYSQL* mysql)
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{
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unsigned long f = 0;
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f |= mysql->options.client_flag;
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|
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/* Send client information for access check */
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f |= CLIENT_CAPABILITIES;
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if (f & CLIENT_MULTI_STATEMENTS) {
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f |= CLIENT_MULTI_RESULTS;
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}
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/**
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* No compression in embedded as we don't send any data,
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* and no pluggable auth, as we cannot do a client-server dialog
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*/
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f &= ~(CLIENT_COMPRESS | CLIENT_PLUGIN_AUTH);
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|
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if (mysql->options.db != NULL) {
|
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f |= CLIENT_CONNECT_WITH_DB;
|
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}
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return f;
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|
}
|
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|
|
|
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static bool create_parse_tree(
|
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THD* thd)
|
|
{
|
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Parser_state parser_state;
|
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bool failp = FALSE;
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const char* virtual_db = "skygw_virtual";
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if (parser_state.init(thd, thd->query(), thd->query_length())) {
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failp = TRUE;
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goto return_here;
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}
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mysql_reset_thd_for_next_command(thd);
|
|
|
|
/** Set some database to thd so that parsing won't fail because of
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* missing database. Then parse. */
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failp = thd->set_db(virtual_db, strlen(virtual_db));
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|
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if (failp) {
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LOGIF(LE, (skygw_log_write_flush(
|
|
LOGFILE_ERROR,
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|
"Error : Failed to set database in thread context.")));
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}
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failp = parse_sql(thd, &parser_state, NULL);
|
|
|
|
if (failp) {
|
|
LOGIF(LD, (skygw_log_write(
|
|
LOGFILE_DEBUG,
|
|
"%lu [readwritesplit:create_parse_tree] failed to "
|
|
"create parse tree.",
|
|
pthread_self())));
|
|
}
|
|
return_here:
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|
return failp;
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|
}
|
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|
|
/**
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|
* @node Set new query type if new is more restrictive than old.
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|
*
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|
* Parameters:
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* @param qtype - <usage>
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|
* <description>
|
|
*
|
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* @param new_type - <usage>
|
|
* <description>
|
|
*
|
|
* @return
|
|
*
|
|
*
|
|
* @details The implementation relies on that enumerated values correspond
|
|
* to the restrictiviness of the value. That is, smaller value means less
|
|
* restrictive, for example, QUERY_TYPE_READ is smaller than QUERY_TYPE_WRITE.
|
|
*
|
|
*/
|
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static u_int16_t set_query_type(
|
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u_int16_t* qtype,
|
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u_int16_t new_type)
|
|
{
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*qtype = MAX(*qtype, new_type);
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return *qtype;
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}
|
|
|
|
/**
|
|
* @node Detect query type, read-only, write, or session update
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|
*
|
|
* Parameters:
|
|
* @param thd - <usage>
|
|
* <description>
|
|
*
|
|
* @return
|
|
*
|
|
*
|
|
* @details Query type is deduced by checking for certain properties
|
|
* of them. The order is essential. Some SQL commands have multiple
|
|
* flags set and changing the order in which flags are tested,
|
|
* the resulting type may be different.
|
|
*
|
|
*/
|
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static skygw_query_type_t resolve_query_type(
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THD* thd)
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|
{
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|
skygw_query_type_t qtype = QUERY_TYPE_UNKNOWN;
|
|
u_int16_t type = QUERY_TYPE_UNKNOWN;
|
|
int set_autocommit_stmt = -1; /*< -1 no, 0 disable, 1 enable */
|
|
LEX* lex;
|
|
Item* item;
|
|
/**
|
|
* By default, if sql_log_bin, that is, recording data modifications
|
|
* to binary log, is disabled, gateway treats operations normally.
|
|
* Effectively nothing is replicated.
|
|
* When force_data_modify_op_replication is TRUE, gateway distributes
|
|
* all write operations to all nodes.
|
|
*/
|
|
bool force_data_modify_op_replication;
|
|
|
|
ss_info_dassert(thd != NULL, ("thd is NULL\n"));
|
|
|
|
force_data_modify_op_replication = FALSE;
|
|
lex = thd->lex;
|
|
|
|
/** SELECT ..INTO variable|OUTFILE|DUMPFILE */
|
|
if (lex->result != NULL) {
|
|
type = QUERY_TYPE_SESSION_WRITE;
|
|
goto return_qtype;
|
|
}
|
|
|
|
if (skygw_stmt_causes_implicit_commit(
|
|
lex,
|
|
&set_autocommit_stmt))
|
|
{
|
|
if (LOG_IS_ENABLED(LOGFILE_TRACE))
|
|
{
|
|
if (sql_command_flags[lex->sql_command] &
|
|
CF_IMPLICT_COMMIT_BEGIN)
|
|
{
|
|
skygw_log_write(
|
|
LOGFILE_TRACE,
|
|
"Implicit COMMIT before executing the "
|
|
"next command.");
|
|
}
|
|
else if (sql_command_flags[lex->sql_command] &
|
|
CF_IMPLICIT_COMMIT_END)
|
|
{
|
|
skygw_log_write(
|
|
LOGFILE_TRACE,
|
|
"Implicit COMMIT after executing the "
|
|
"next command.");
|
|
}
|
|
}
|
|
|
|
if (set_autocommit_stmt == 1)
|
|
{
|
|
type |= QUERY_TYPE_ENABLE_AUTOCOMMIT;
|
|
}
|
|
type |= QUERY_TYPE_COMMIT;
|
|
}
|
|
|
|
if (set_autocommit_stmt == 0)
|
|
{
|
|
if (LOG_IS_ENABLED(LOGFILE_TRACE))
|
|
{
|
|
skygw_log_write(
|
|
LOGFILE_TRACE,
|
|
"Disable autocommit : implicit START TRANSACTION"
|
|
" before executing the next command.");
|
|
}
|
|
type |= QUERY_TYPE_DISABLE_AUTOCOMMIT;
|
|
type |= QUERY_TYPE_BEGIN_TRX;
|
|
}
|
|
/**
|
|
* REVOKE ALL, ASSIGN_TO_KEYCACHE,
|
|
* PRELOAD_KEYS, FLUSH, RESET, CREATE|ALTER|DROP SERVER
|
|
*/
|
|
if (lex->option_type == OPT_GLOBAL)
|
|
{
|
|
type |= QUERY_TYPE_GLOBAL_WRITE;
|
|
goto return_qtype;
|
|
}
|
|
else if (lex->option_type == OPT_SESSION)
|
|
{
|
|
/** SHOW commands are all reads to one backend */
|
|
if (lex->sql_command == SQLCOM_SHOW_VARIABLES)
|
|
{
|
|
type |= QUERY_TYPE_SESSION_READ;
|
|
}
|
|
else
|
|
{
|
|
type |= QUERY_TYPE_SESSION_WRITE;
|
|
}
|
|
goto return_qtype;
|
|
}
|
|
/**
|
|
* 1:ALTER TABLE, TRUNCATE, REPAIR, OPTIMIZE, ANALYZE, CHECK.
|
|
* 2:CREATE|ALTER|DROP|TRUNCATE|RENAME TABLE, LOAD, CREATE|DROP|ALTER DB,
|
|
* CREATE|DROP INDEX, CREATE|DROP VIEW, CREATE|DROP TRIGGER,
|
|
* CREATE|ALTER|DROP EVENT, UPDATE, INSERT, INSERT(SELECT),
|
|
* DELETE, REPLACE, REPLACE(SELECT), CREATE|RENAME|DROP USER,
|
|
* GRANT, REVOKE, OPTIMIZE, CREATE|ALTER|DROP FUNCTION|PROCEDURE,
|
|
* CREATE SPFUNCTION, INSTALL|UNINSTALL PLUGIN
|
|
*/
|
|
if (is_log_table_write_query(lex->sql_command) ||
|
|
is_update_query(lex->sql_command))
|
|
{
|
|
if (thd->variables.sql_log_bin == 0 &&
|
|
force_data_modify_op_replication)
|
|
{
|
|
type |= QUERY_TYPE_SESSION_WRITE;
|
|
}
|
|
else
|
|
{
|
|
type |= QUERY_TYPE_WRITE;
|
|
}
|
|
goto return_qtype;
|
|
}
|
|
|
|
/** Try to catch session modifications here */
|
|
switch (lex->sql_command) {
|
|
case SQLCOM_SET_OPTION: /*< SET commands. */
|
|
if (lex->option_type == OPT_GLOBAL)
|
|
{
|
|
type |= QUERY_TYPE_GLOBAL_WRITE;
|
|
break;
|
|
}
|
|
/**<! fall through */
|
|
case SQLCOM_CHANGE_DB:
|
|
case SQLCOM_DEALLOCATE_PREPARE:
|
|
type |= QUERY_TYPE_SESSION_WRITE;
|
|
break;
|
|
|
|
case SQLCOM_SELECT:
|
|
type |= QUERY_TYPE_READ;
|
|
break;
|
|
|
|
case SQLCOM_CALL:
|
|
type |= QUERY_TYPE_WRITE;
|
|
break;
|
|
|
|
case SQLCOM_BEGIN:
|
|
type |= QUERY_TYPE_BEGIN_TRX;
|
|
goto return_qtype;
|
|
break;
|
|
|
|
case SQLCOM_COMMIT:
|
|
type |= QUERY_TYPE_COMMIT;
|
|
goto return_qtype;
|
|
break;
|
|
|
|
case SQLCOM_ROLLBACK:
|
|
type |= QUERY_TYPE_ROLLBACK;
|
|
goto return_qtype;
|
|
break;
|
|
|
|
case SQLCOM_PREPARE:
|
|
type |= QUERY_TYPE_PREPARE_NAMED_STMT;
|
|
goto return_qtype;
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
|
|
if (QTYPE_LESS_RESTRICTIVE_THAN_WRITE(type)) {
|
|
/**
|
|
* These values won't change qtype more restrictive than write.
|
|
* UDFs and procedures could possibly cause session-wide write,
|
|
* but unless their content is replicated this is a limitation
|
|
* of this implementation.
|
|
* In other words : UDFs and procedures are not allowed to
|
|
* perform writes which are not replicated but nede to repeat
|
|
* in every node.
|
|
* It is not sure if such statements exist. vraa 25.10.13
|
|
*/
|
|
|
|
/**
|
|
* Search for system functions, UDFs and stored procedures.
|
|
*/
|
|
for (item=thd->free_list; item != NULL; item=item->next) {
|
|
Item::Type itype;
|
|
|
|
itype = item->type();
|
|
LOGIF(LD, (skygw_log_write(
|
|
LOGFILE_DEBUG,
|
|
"%lu [resolve_query_type] Item %s:%s",
|
|
pthread_self(),
|
|
item->name,
|
|
STRITEMTYPE(itype))));
|
|
|
|
if (itype == Item::SUBSELECT_ITEM) {
|
|
continue;
|
|
} else if (itype == Item::FUNC_ITEM) {
|
|
int func_qtype = QUERY_TYPE_UNKNOWN;
|
|
/**
|
|
* Item types:
|
|
* FIELD_ITEM = 0, FUNC_ITEM,
|
|
* SUM_FUNC_ITEM, STRING_ITEM, INT_ITEM,
|
|
* REAL_ITEM, NULL_ITEM, VARBIN_ITEM,
|
|
* COPY_STR_ITEM, FIELD_AVG_ITEM,
|
|
* DEFAULT_VALUE_ITEM, PROC_ITEM,
|
|
* COND_ITEM, REF_ITEM, FIELD_STD_ITEM,
|
|
* FIELD_VARIANCE_ITEM,
|
|
* INSERT_VALUE_ITEM,
|
|
* SUBSELECT_ITEM, ROW_ITEM, CACHE_ITEM,
|
|
* TYPE_HOLDER, PARAM_ITEM,
|
|
* TRIGGER_FIELD_ITEM, DECIMAL_ITEM,
|
|
* XPATH_NODESET, XPATH_NODESET_CMP,
|
|
* VIEW_FIXER_ITEM,
|
|
* EXPR_CACHE_ITEM == 27
|
|
**/
|
|
|
|
Item_func::Functype ftype;
|
|
ftype = ((Item_func*)item)->functype();
|
|
/**
|
|
* Item_func types:
|
|
*
|
|
* UNKNOWN_FUNC = 0,EQ_FUNC, EQUAL_FUNC,
|
|
* NE_FUNC, LT_FUNC, LE_FUNC,
|
|
* GE_FUNC, GT_FUNC, FT_FUNC,
|
|
* LIKE_FUNC == 10, ISNULL_FUNC, ISNOTNULL_FUNC,
|
|
* COND_AND_FUNC, COND_OR_FUNC, XOR_FUNC,
|
|
* BETWEEN, IN_FUNC,
|
|
* MULT_EQUAL_FUNC, INTERVAL_FUNC,
|
|
* ISNOTNULLTEST_FUNC == 20,
|
|
* SP_EQUALS_FUNC, SP_DISJOINT_FUNC,
|
|
* SP_INTERSECTS_FUNC,
|
|
* SP_TOUCHES_FUNC, SP_CROSSES_FUNC,
|
|
* SP_WITHIN_FUNC, SP_CONTAINS_FUNC,
|
|
* SP_OVERLAPS_FUNC,
|
|
* SP_STARTPOINT, SP_ENDPOINT == 30,
|
|
* SP_EXTERIORRING, SP_POINTN, SP_GEOMETRYN,
|
|
* SP_INTERIORRINGN,NOT_FUNC, NOT_ALL_FUNC,
|
|
* NOW_FUNC, TRIG_COND_FUNC,
|
|
* SUSERVAR_FUNC, GUSERVAR_FUNC == 40,
|
|
* COLLATE_FUNC, EXTRACT_FUNC,
|
|
* CHAR_TYPECAST_FUNC,
|
|
* FUNC_SP, UDF_FUNC, NEG_FUNC,
|
|
* GSYSVAR_FUNC == 47
|
|
**/
|
|
switch (ftype) {
|
|
case Item_func::FUNC_SP:
|
|
/**
|
|
* An unknown (for maxscale) function / sp
|
|
* belongs to this category.
|
|
*/
|
|
func_qtype |= QUERY_TYPE_WRITE;
|
|
LOGIF(LD, (skygw_log_write(
|
|
LOGFILE_DEBUG,
|
|
"%lu [resolve_query_type] "
|
|
"functype FUNC_SP, stored proc "
|
|
"or unknown function.",
|
|
pthread_self())));
|
|
break;
|
|
case Item_func::UDF_FUNC:
|
|
func_qtype |= QUERY_TYPE_WRITE;
|
|
LOGIF(LD, (skygw_log_write(
|
|
LOGFILE_DEBUG,
|
|
"%lu [resolve_query_type] "
|
|
"functype UDF_FUNC, user-defined "
|
|
"function.",
|
|
pthread_self())));
|
|
break;
|
|
case Item_func::NOW_FUNC:
|
|
case Item_func::GSYSVAR_FUNC:
|
|
func_qtype |= QUERY_TYPE_LOCAL_READ;
|
|
LOGIF(LD, (skygw_log_write(
|
|
LOGFILE_DEBUG,
|
|
"%lu [resolve_query_type] "
|
|
"functype NOW_FUNC, could be "
|
|
"executed in MaxScale.",
|
|
pthread_self())));
|
|
break;
|
|
case Item_func::UNKNOWN_FUNC:
|
|
func_qtype |= QUERY_TYPE_READ;
|
|
/**
|
|
* Many built-in functions are of this
|
|
* type, for example, rand(), soundex(),
|
|
* repeat() .
|
|
*/
|
|
LOGIF(LD, (skygw_log_write(
|
|
LOGFILE_DEBUG,
|
|
"%lu [resolve_query_type] "
|
|
"functype UNKNOWN_FUNC, "
|
|
"typically some system function.",
|
|
pthread_self())));
|
|
break;
|
|
default:
|
|
LOGIF(LD, (skygw_log_write(
|
|
LOGFILE_DEBUG,
|
|
"%lu [resolve_query_type] "
|
|
"Unknown functype %d. Something "
|
|
"has gone wrong.",
|
|
pthread_self(),
|
|
ftype)));
|
|
break;
|
|
} /**< switch */
|
|
/**< Set new query type */
|
|
type |= set_query_type(&type, func_qtype);
|
|
}
|
|
/**
|
|
* Write is as restrictive as it gets due functions,
|
|
* so break.
|
|
*/
|
|
if ((type & QUERY_TYPE_WRITE) == QUERY_TYPE_WRITE) {
|
|
break;
|
|
}
|
|
} /**< for */
|
|
} /**< if */
|
|
return_qtype:
|
|
qtype = (skygw_query_type_t)type;
|
|
return qtype;
|
|
}
|
|
|
|
/**
|
|
* Checks if statement causes implicit COMMIT.
|
|
* autocommit_stmt gets values 1, 0 or -1 if stmt is enable, disable or
|
|
* something else than autocommit.
|
|
*/
|
|
static bool skygw_stmt_causes_implicit_commit(
|
|
LEX* lex,
|
|
int* autocommit_stmt)
|
|
{
|
|
bool succp;
|
|
|
|
if (!(sql_command_flags[lex->sql_command] & CF_AUTO_COMMIT_TRANS))
|
|
{
|
|
succp = false;
|
|
goto return_succp;
|
|
}
|
|
|
|
switch (lex->sql_command) {
|
|
case SQLCOM_DROP_TABLE:
|
|
succp = !(lex->drop_temporary);
|
|
break;
|
|
case SQLCOM_ALTER_TABLE:
|
|
case SQLCOM_CREATE_TABLE:
|
|
/* If CREATE TABLE of non-temporary table, do implicit commit */
|
|
succp = !(lex->create_info.options & HA_LEX_CREATE_TMP_TABLE);
|
|
break;
|
|
case SQLCOM_SET_OPTION:
|
|
if ((*autocommit_stmt = is_autocommit_stmt(lex)) == 1)
|
|
{
|
|
succp = true;
|
|
}
|
|
else
|
|
{
|
|
succp =false;
|
|
}
|
|
break;
|
|
default:
|
|
succp = true;
|
|
break;
|
|
}
|
|
return_succp:
|
|
return succp;
|
|
}
|
|
|
|
|
|
/**
|
|
* Finds out if stmt is SET autocommit
|
|
* and if the new value matches with the enable_cmd argument.
|
|
*
|
|
* Returns 1, 0, or -1 if command was:
|
|
* enable, disable, or not autocommit, respectively.
|
|
*/
|
|
static int is_autocommit_stmt(
|
|
LEX* lex)
|
|
{
|
|
struct list_node* node;
|
|
set_var* setvar;
|
|
int rc = -1;
|
|
static char target[8]; /*< for converted string */
|
|
Item* item = NULL;
|
|
|
|
node = lex->var_list.first_node();
|
|
setvar=(set_var*)node->info;
|
|
|
|
if (setvar == NULL)
|
|
{
|
|
goto return_rc;
|
|
}
|
|
|
|
do /*< Search for the last occurrence of 'autocommit' */
|
|
{
|
|
if ((sys_var*)setvar->var == Sys_autocommit_ptr)
|
|
{
|
|
item = setvar->value;
|
|
}
|
|
node = node->next;
|
|
} while ((setvar = (set_var*)node->info) != NULL);
|
|
|
|
if (item != NULL) /*< found autocommit command */
|
|
{
|
|
if (item->type() == Item::INT_ITEM) /*< '0' or '1' */
|
|
{
|
|
rc = item->val_int();
|
|
|
|
if (rc > 1 || rc < 0)
|
|
{
|
|
rc = -1;
|
|
}
|
|
}
|
|
else if (item->type() == Item::STRING_ITEM) /*< 'on' or 'off' */
|
|
{
|
|
String str(target, sizeof(target), system_charset_info);
|
|
String* res = item->val_str(&str);
|
|
|
|
if ((rc = find_type(&bool_typelib, res->ptr(), res->length(), false)))
|
|
{
|
|
ss_dassert(rc >= 0 && rc <= 2);
|
|
/**
|
|
* rc is the position of matchin string in
|
|
* typelib's value array.
|
|
* 1=OFF, 2=ON.
|
|
*/
|
|
rc -= 1;
|
|
}
|
|
}
|
|
}
|
|
|
|
return_rc:
|
|
return rc;
|
|
}
|
|
|
|
|
|
char* skygw_query_classifier_get_stmtname(
|
|
MYSQL* mysql)
|
|
{
|
|
return ((THD *)(mysql->thd))->lex->prepared_stmt_name.str;
|
|
|
|
}
|
|
|
|
/**
|
|
* Replace user-provided literals with question marks. Return a copy of the
|
|
* querystr with replacements.
|
|
*
|
|
* @param querybuf GWBUF buffer including necessary parsing info
|
|
*
|
|
* @return Copy of querystr where literals are replaces with question marks or
|
|
* NULL if querystr is NULL, thread context or lex are NULL or if replacement
|
|
* function fails.
|
|
*
|
|
* Replaced literal types are STRING_ITEM,INT_ITEM,DECIMAL_ITEM,REAL_ITEM,
|
|
* VARBIN_ITEM,NULL_ITEM
|
|
*/
|
|
char* skygw_get_canonical(
|
|
GWBUF* querybuf)
|
|
{
|
|
parsing_info_t* pi;
|
|
MYSQL* mysql;
|
|
THD* thd;
|
|
LEX* lex;
|
|
Item* item;
|
|
char* querystr;
|
|
|
|
if (!GWBUF_IS_PARSED(querybuf))
|
|
{
|
|
querystr = NULL;
|
|
goto retblock;
|
|
}
|
|
pi = (parsing_info_t *)gwbuf_get_buffer_object_data(querybuf,
|
|
GWBUF_PARSING_INFO);
|
|
CHK_PARSING_INFO(pi);
|
|
|
|
if (pi == NULL)
|
|
{
|
|
querystr = NULL;
|
|
goto retblock;
|
|
}
|
|
|
|
if (pi->pi_query_plain_str == NULL ||
|
|
(mysql = (MYSQL *)pi->pi_handle) == NULL ||
|
|
(thd = (THD *)mysql->thd) == NULL ||
|
|
(lex = thd->lex) == NULL)
|
|
{
|
|
ss_dassert(pi->pi_query_plain_str != NULL &&
|
|
mysql != NULL &&
|
|
thd != NULL &&
|
|
lex != NULL);
|
|
querystr = NULL;
|
|
goto retblock;
|
|
}
|
|
querystr = strdup(pi->pi_query_plain_str);
|
|
|
|
for (item=thd->free_list; item != NULL; item=item->next)
|
|
{
|
|
Item::Type itype;
|
|
|
|
if (item->name == NULL)
|
|
{
|
|
continue;
|
|
}
|
|
itype = item->type();
|
|
|
|
if (itype == Item::STRING_ITEM)
|
|
{
|
|
String tokenstr;
|
|
String* res = item->val_str_ascii(&tokenstr);
|
|
|
|
if (res->is_empty()) /*< empty string */
|
|
{
|
|
querystr = replace_literal(querystr, "\"\"", "\"?\"");
|
|
}
|
|
else
|
|
{
|
|
querystr = replace_literal(querystr, res->ptr(), "?");
|
|
}
|
|
}
|
|
else if (itype == Item::INT_ITEM ||
|
|
itype == Item::DECIMAL_ITEM ||
|
|
itype == Item::REAL_ITEM ||
|
|
itype == Item::VARBIN_ITEM ||
|
|
itype == Item::NULL_ITEM)
|
|
{
|
|
querystr = replace_literal(querystr, item->name, "?");
|
|
}
|
|
} /*< for */
|
|
retblock:
|
|
return querystr;
|
|
}
|
|
|
|
|
|
/**
|
|
* Create parsing information; initialize mysql handle, allocate parsing info
|
|
* struct and set handle and free function pointer to it.
|
|
*
|
|
* @param donefun pointer to free function
|
|
*
|
|
* @return pointer to parsing information
|
|
*/
|
|
parsing_info_t* parsing_info_init(
|
|
void (*donefun)(void *))
|
|
{
|
|
parsing_info_t* pi = NULL;
|
|
MYSQL* mysql;
|
|
const char* user = "skygw";
|
|
const char* db = "skygw";
|
|
|
|
ss_dassert(donefun != NULL);
|
|
|
|
/** Get server handle */
|
|
mysql = mysql_init(NULL);
|
|
ss_dassert(mysql != NULL);
|
|
|
|
if (mysql == NULL) {
|
|
LOGIF(LE, (skygw_log_write_flush(
|
|
LOGFILE_ERROR,
|
|
"Error : call to mysql_real_connect failed due %d, %s.",
|
|
mysql_errno(mysql),
|
|
mysql_error(mysql))));
|
|
|
|
goto retblock;
|
|
}
|
|
/** Set methods and authentication to mysql */
|
|
mysql_options(mysql, MYSQL_READ_DEFAULT_GROUP, "libmysqld_skygw");
|
|
mysql_options(mysql, MYSQL_OPT_USE_EMBEDDED_CONNECTION, NULL);
|
|
mysql->methods = &embedded_methods;
|
|
mysql->user = my_strdup(user, MYF(0));
|
|
mysql->db = my_strdup(db, MYF(0));
|
|
mysql->passwd = NULL;
|
|
|
|
pi = (parsing_info_t*)calloc(1, sizeof(parsing_info_t));
|
|
|
|
if (pi == NULL)
|
|
{
|
|
mysql_close(mysql);
|
|
goto retblock;
|
|
}
|
|
#if defined(SS_DEBUG)
|
|
pi->pi_chk_top = CHK_NUM_PINFO;
|
|
pi->pi_chk_tail = CHK_NUM_PINFO;
|
|
#endif
|
|
/** Set handle and free function to parsing info struct */
|
|
pi->pi_handle = mysql;
|
|
pi->pi_done_fp = donefun;
|
|
|
|
retblock:
|
|
return pi;
|
|
}
|
|
|
|
/**
|
|
* Free function for parsing info. Called by gwbuf_free or in case initialization
|
|
* of parsing information fails.
|
|
*
|
|
* @param ptr Pointer to parsing information, cast required
|
|
*
|
|
* @return void
|
|
*
|
|
*/
|
|
void parsing_info_done(
|
|
void* ptr)
|
|
{
|
|
parsing_info_t* pi = (parsing_info_t *)ptr;
|
|
|
|
if (pi->pi_handle != NULL)
|
|
{
|
|
MYSQL* mysql = (MYSQL *)pi->pi_handle;
|
|
|
|
if (mysql->thd != NULL)
|
|
{
|
|
(*mysql->methods->free_embedded_thd)(mysql);
|
|
mysql->thd = NULL;
|
|
}
|
|
mysql_close(mysql);
|
|
}
|
|
/** Free plain text query string */
|
|
if (pi->pi_query_plain_str != NULL)
|
|
{
|
|
free(pi->pi_query_plain_str);
|
|
}
|
|
free(pi);
|
|
}
|
|
|
|
/**
|
|
* Add plain text query string to parsing info.
|
|
*
|
|
* @param ptr Pointer to parsing info struct, cast required
|
|
* @param str String to be added
|
|
*
|
|
* @return void
|
|
*/
|
|
static void parsing_info_set_plain_str(
|
|
void* ptr,
|
|
char* str)
|
|
{
|
|
parsing_info_t* pi = (parsing_info_t *)ptr;
|
|
CHK_PARSING_INFO(pi);
|
|
|
|
pi->pi_query_plain_str = str;
|
|
} |