16a76fcd28
To make it plain that it is a mask that is returned and not a specific value from the enum qc_query_type_t.
2769 lines
78 KiB
C++
2769 lines
78 KiB
C++
/**
|
|
* @section LICENCE
|
|
*
|
|
* This file is distributed as part of the MariaDB Corporation MaxScale. It is
|
|
* free software: you can redistribute it and/or modify it under
|
|
* the terms of the GNU General Public License as published by the
|
|
* Free Software Foundation, version 2.
|
|
*
|
|
* 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 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 Street, Fifth Floor, Boston, MA
|
|
* 02110-1301 USA.
|
|
*
|
|
* Copyright MariaDB Corporation Ab
|
|
*
|
|
* @file
|
|
*
|
|
*/
|
|
|
|
#define EMBEDDED_LIBRARY
|
|
#define MYSQL_YACC
|
|
#define MYSQL_LEX012
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|
#define MYSQL_SERVER
|
|
#if defined(MYSQL_CLIENT)
|
|
#undef MYSQL_CLIENT
|
|
#endif
|
|
|
|
#include <my_config.h>
|
|
#include <mysql.h>
|
|
#include <my_sys.h>
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|
#include <my_global.h>
|
|
#include <my_dbug.h>
|
|
#include <my_base.h>
|
|
#include <sql_list.h>
|
|
#include <mysqld_error.h>
|
|
#include <sql_class.h>
|
|
#include <sql_lex.h>
|
|
#include <embedded_priv.h>
|
|
#include <sql_class.h>
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|
#include <sql_lex.h>
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|
#include <sql_parse.h>
|
|
#include <errmsg.h>
|
|
#include <client_settings.h>
|
|
// In client_settings.h mysql_server_init and mysql_server_end are defined to
|
|
// mysql_client_plugin_init and mysql_client_plugin_deinit respectively.
|
|
// Those must be undefined, so that we here really call mysql_server_[init|end].
|
|
#undef mysql_server_init
|
|
#undef mysql_server_end
|
|
#include <set_var.h>
|
|
#include <strfunc.h>
|
|
#include <item_func.h>
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|
|
|
#include <maxscale/debug.h>
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|
#include <maxscale/log_manager.h>
|
|
#include <maxscale/query_classifier.h>
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|
// <maxscale/protocol/mysql.h> assumes it is being compiled agains Connector-C,
|
|
// so we need to make certain Connector-C constants visible.
|
|
#define MYSQL_COM_QUIT COM_QUIT
|
|
#define MYSQL_COM_INIT_DB COM_INIT_DB
|
|
#define MYSQL_COM_CHANGE_USER COM_CHANGE_USER
|
|
#include <maxscale/protocol/mysql.h>
|
|
#include <maxscale/gwdirs.h>
|
|
#include <maxscale/utils.h>
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <stdarg.h>
|
|
|
|
#define MYSQL_COM_QUERY_HEADER_SIZE 5 /*< 3 bytes size, 1 sequence, 1 command */
|
|
#define MAX_QUERYBUF_SIZE 2048
|
|
typedef struct parsing_info_st
|
|
{
|
|
#if defined(SS_DEBUG)
|
|
skygw_chk_t pi_chk_top;
|
|
#endif
|
|
void* pi_handle; /*< parsing info object pointer */
|
|
char* pi_query_plain_str; /*< query as plain string */
|
|
void (*pi_done_fp)(void *); /*< clean-up function for parsing info */
|
|
QC_FIELD_INFO* field_infos;
|
|
size_t field_infos_len;
|
|
size_t field_infos_capacity;
|
|
QC_FUNCTION_INFO* function_infos;
|
|
size_t function_infos_len;
|
|
size_t function_infos_capacity;
|
|
GWBUF* preparable_stmt;
|
|
#if defined(SS_DEBUG)
|
|
skygw_chk_t pi_chk_tail;
|
|
#endif
|
|
} parsing_info_t;
|
|
|
|
#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(MYSQL* mysql, char* query_str);
|
|
static unsigned long set_client_flags(MYSQL* mysql);
|
|
static bool create_parse_tree(THD* thd);
|
|
static uint32_t resolve_query_type(parsing_info_t*, THD* thd);
|
|
static bool skygw_stmt_causes_implicit_commit(LEX* lex, int* autocommit_stmt);
|
|
|
|
static int is_autocommit_stmt(LEX* lex);
|
|
static parsing_info_t* parsing_info_init(void (*donefun)(void *));
|
|
static void parsing_info_set_plain_str(void* ptr, char* str);
|
|
/** Free THD context and close MYSQL */
|
|
static void parsing_info_done(void* ptr);
|
|
static TABLE_LIST* skygw_get_affected_tables(void* lexptr);
|
|
static bool ensure_query_is_parsed(GWBUF* query);
|
|
static bool parse_query(GWBUF* querybuf);
|
|
static bool query_is_parsed(GWBUF* buf);
|
|
|
|
|
|
/**
|
|
* Ensures that the query is parsed. If it is not already parsed, it
|
|
* will be parsed.
|
|
*
|
|
* @return true if the query is parsed, false otherwise.
|
|
*/
|
|
bool ensure_query_is_parsed(GWBUF* query)
|
|
{
|
|
bool parsed = query_is_parsed(query);
|
|
|
|
if (!parsed)
|
|
{
|
|
parsed = parse_query(query);
|
|
|
|
if (!parsed)
|
|
{
|
|
MXS_ERROR("Unable to parse query, out of resources?");
|
|
}
|
|
}
|
|
|
|
return parsed;
|
|
}
|
|
|
|
int32_t qc_mysql_parse(GWBUF* querybuf, int32_t* result)
|
|
{
|
|
bool parsed = ensure_query_is_parsed(querybuf);
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|
|
|
// Since the query is parsed using the same parser - subject to version
|
|
// differences between the embedded library and the server - either the
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|
// query is valid and hence correctly parsed, or the query is invalid in
|
|
// which case the server will also consider it invalid and reject it. So,
|
|
// it's always ok to claim it has been parsed.
|
|
|
|
if (parsed)
|
|
{
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|
*result = QC_QUERY_PARSED;
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|
}
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|
else
|
|
{
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|
*result = QC_QUERY_INVALID;
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|
}
|
|
|
|
return QC_RESULT_OK;
|
|
}
|
|
|
|
int32_t qc_mysql_get_type_mask(GWBUF* querybuf, uint32_t* type_mask)
|
|
{
|
|
*type_mask = QUERY_TYPE_UNKNOWN;
|
|
MYSQL* mysql;
|
|
bool succp;
|
|
|
|
ss_info_dassert(querybuf != NULL, ("querybuf is NULL"));
|
|
|
|
if (querybuf == NULL)
|
|
{
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|
succp = false;
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|
goto retblock;
|
|
}
|
|
|
|
succp = ensure_query_is_parsed(querybuf);
|
|
|
|
/** Read thd pointer and resolve the query type with it. */
|
|
if (succp)
|
|
{
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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);
|
|
|
|
if (pi != NULL)
|
|
{
|
|
mysql = (MYSQL *) pi->pi_handle;
|
|
|
|
/** Find out the query type */
|
|
if (mysql != NULL)
|
|
{
|
|
*type_mask = resolve_query_type(pi, (THD *) mysql->thd);
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|
}
|
|
}
|
|
}
|
|
|
|
retblock:
|
|
return QC_RESULT_OK;
|
|
}
|
|
|
|
/**
|
|
* Create parsing info and try to parse the query included in the query buffer.
|
|
* Store pointer to created parse_tree_t object to buffer.
|
|
*
|
|
* @param querybuf buffer including the query and possibly the parsing information
|
|
*
|
|
* @return true if succeed, false otherwise
|
|
*/
|
|
static bool parse_query(GWBUF* querybuf)
|
|
{
|
|
bool succp;
|
|
THD* thd;
|
|
uint8_t* data;
|
|
size_t len;
|
|
char* query_str = NULL;
|
|
parsing_info_t* pi;
|
|
|
|
CHK_GWBUF(querybuf);
|
|
/** Do not parse without releasing previous parse info first */
|
|
ss_dassert(!query_is_parsed(querybuf));
|
|
|
|
if (querybuf == NULL || query_is_parsed(querybuf))
|
|
{
|
|
MXS_ERROR("Query is NULL (%p) or query is already parsed.", querybuf);
|
|
return false;
|
|
}
|
|
|
|
/** Create parsing info */
|
|
pi = parsing_info_init(parsing_info_done);
|
|
|
|
if (pi == NULL)
|
|
{
|
|
MXS_ERROR("Parsing info initialization failed.");
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|
succp = false;
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|
goto retblock;
|
|
}
|
|
|
|
/** Extract query and copy it to different buffer */
|
|
data = (uint8_t*) GWBUF_DATA(querybuf);
|
|
len = MYSQL_GET_PAYLOAD_LEN(data) - 1; /*< distract 1 for packet type byte */
|
|
|
|
|
|
if (len < 1 || len >= ~((size_t) 0) - 1 || (query_str = (char *) malloc(len + 1)) == NULL)
|
|
{
|
|
/** Free parsing info data */
|
|
MXS_ERROR("Length (%lu) is 0 or query string allocation failed (%p). Buffer is %lu bytes.",
|
|
len, query_str, GWBUF_LENGTH(querybuf));
|
|
parsing_info_done(pi);
|
|
succp = false;
|
|
goto retblock;
|
|
}
|
|
|
|
memcpy(query_str, &data[5], len);
|
|
memset(&query_str[len], 0, 1);
|
|
parsing_info_set_plain_str(pi, query_str);
|
|
|
|
/** Get one or create new THD object to be use in parsing */
|
|
thd = get_or_create_thd_for_parsing((MYSQL *) pi->pi_handle, query_str);
|
|
|
|
if (thd == NULL)
|
|
{
|
|
MXS_ERROR("THD creation failed.");
|
|
/** Free parsing info data */
|
|
parsing_info_done(pi);
|
|
succp = false;
|
|
goto retblock;
|
|
}
|
|
|
|
/**
|
|
* Create parse_tree inside thd.
|
|
* thd and lex are readable even if creating parse tree fails.
|
|
*/
|
|
create_parse_tree(thd);
|
|
/** Add complete parsing info struct to the query buffer */
|
|
gwbuf_add_buffer_object(querybuf,
|
|
GWBUF_PARSING_INFO,
|
|
(void *) pi,
|
|
parsing_info_done);
|
|
|
|
succp = true;
|
|
retblock:
|
|
return succp;
|
|
}
|
|
|
|
/**
|
|
* If buffer has non-NULL gwbuf_parsing_info it is parsed and it has parsing
|
|
* information included.
|
|
*
|
|
* @param buf buffer being examined
|
|
*
|
|
* @return true or false
|
|
*/
|
|
static bool query_is_parsed(GWBUF* buf)
|
|
{
|
|
CHK_GWBUF(buf);
|
|
return (buf != NULL && GWBUF_IS_PARSED(buf));
|
|
}
|
|
|
|
/**
|
|
* Create a thread context, thd, init embedded server, connect to it, and allocate
|
|
* query to thd.
|
|
*
|
|
* Parameters:
|
|
* @param mysql Database handle
|
|
*
|
|
* @param query_str Query in plain txt string
|
|
*
|
|
* @return Thread context pointer
|
|
*
|
|
*/
|
|
static THD* get_or_create_thd_for_parsing(MYSQL* mysql, char* query_str)
|
|
{
|
|
THD* thd = NULL;
|
|
unsigned long client_flags;
|
|
char* db = mysql->options.db;
|
|
bool failp = FALSE;
|
|
size_t query_len;
|
|
|
|
ss_info_dassert(mysql != NULL, ("mysql is NULL"));
|
|
ss_info_dassert(query_str != NULL, ("query_str is NULL"));
|
|
|
|
query_len = strlen(query_str);
|
|
client_flags = set_client_flags(mysql);
|
|
|
|
/** Get THD.
|
|
* NOTE: Instead of creating new every time, THD instance could
|
|
* be get from a pool of them.
|
|
*/
|
|
thd = (THD *) create_embedded_thd(client_flags);
|
|
|
|
if (thd == NULL)
|
|
{
|
|
MXS_ERROR("Failed to create thread context for parsing.");
|
|
goto return_thd;
|
|
}
|
|
|
|
mysql->thd = thd;
|
|
init_embedded_mysql(mysql, client_flags);
|
|
failp = check_embedded_connection(mysql, db);
|
|
|
|
if (failp)
|
|
{
|
|
MXS_ERROR("Call to check_embedded_connection failed.");
|
|
goto return_err_with_thd;
|
|
}
|
|
|
|
thd->clear_data_list();
|
|
|
|
/** Check that we are calling the client functions in right order */
|
|
if (mysql->status != MYSQL_STATUS_READY)
|
|
{
|
|
set_mysql_error(mysql, CR_COMMANDS_OUT_OF_SYNC, unknown_sqlstate);
|
|
MXS_ERROR("Invalid status %d in embedded server.",
|
|
mysql->status);
|
|
goto return_err_with_thd;
|
|
}
|
|
|
|
/** Clear result variables */
|
|
thd->current_stmt = NULL;
|
|
thd->store_globals();
|
|
/**
|
|
* We have to call free_old_query before we start to fill mysql->fields
|
|
* for new query. In the case of embedded server we collect field data
|
|
* during query execution (not during data retrieval as it is in remote
|
|
* client). So we have to call free_old_query here
|
|
*/
|
|
free_old_query(mysql);
|
|
thd->extra_length = query_len;
|
|
thd->extra_data = query_str;
|
|
alloc_query(thd, query_str, query_len);
|
|
goto return_thd;
|
|
|
|
return_err_with_thd:
|
|
(*mysql->methods->free_embedded_thd)(mysql);
|
|
thd = 0;
|
|
mysql->thd = 0;
|
|
return_thd:
|
|
return thd;
|
|
}
|
|
|
|
/**
|
|
* @node Set client flags. This is copied from libmysqld.c:mysql_real_connect
|
|
*
|
|
* Parameters:
|
|
* @param mysql - <usage>
|
|
* <description>
|
|
*
|
|
* @return
|
|
*
|
|
*
|
|
* @details (write detailed description here)
|
|
*
|
|
*/
|
|
static unsigned long set_client_flags(MYSQL* mysql)
|
|
{
|
|
unsigned long f = 0;
|
|
|
|
f |= mysql->options.client_flag;
|
|
|
|
/* Send client information for access check */
|
|
f |= CLIENT_CAPABILITIES;
|
|
|
|
if (f & CLIENT_MULTI_STATEMENTS)
|
|
{
|
|
f |= CLIENT_MULTI_RESULTS;
|
|
}
|
|
|
|
/**
|
|
* No compression in embedded as we don't send any data,
|
|
* and no pluggable auth, as we cannot do a client-server dialog
|
|
*/
|
|
f &= ~(CLIENT_COMPRESS | CLIENT_PLUGIN_AUTH);
|
|
|
|
if (mysql->options.db != NULL)
|
|
{
|
|
f |= CLIENT_CONNECT_WITH_DB;
|
|
}
|
|
|
|
return f;
|
|
}
|
|
|
|
static bool create_parse_tree(THD* thd)
|
|
{
|
|
Parser_state parser_state;
|
|
bool failp = FALSE;
|
|
const char* virtual_db = "skygw_virtual";
|
|
|
|
if (parser_state.init(thd, thd->query(), thd->query_length()))
|
|
{
|
|
failp = TRUE;
|
|
goto return_here;
|
|
}
|
|
|
|
thd->reset_for_next_command();
|
|
|
|
/**
|
|
* Set some database to thd so that parsing won't fail because of
|
|
* missing database. Then parse.
|
|
*/
|
|
failp = thd->set_db(virtual_db, strlen(virtual_db));
|
|
|
|
if (failp)
|
|
{
|
|
MXS_ERROR("Failed to set database in thread context.");
|
|
}
|
|
|
|
failp = parse_sql(thd, &parser_state, NULL);
|
|
|
|
if (failp)
|
|
{
|
|
MXS_DEBUG("%lu [readwritesplit:create_parse_tree] failed to "
|
|
"create parse tree.",
|
|
pthread_self());
|
|
}
|
|
|
|
return_here:
|
|
return failp;
|
|
}
|
|
|
|
/**
|
|
* Sniff whether the statement is
|
|
*
|
|
* SET ROLE ...
|
|
* SET NAMES ...
|
|
* SET PASSWORD ...
|
|
* SET CHARACTER ...
|
|
*
|
|
* Depending on what kind of SET statement it is, the parser of the embedded
|
|
* library creates instances of set_var_user, set_var, set_var_password,
|
|
* set_var_role, etc. that all are derived from set_var_base. However, there
|
|
* is no type-information available in set_var_base, which is the type of the
|
|
* instances when accessed from the lexer. Consequently, we cannot know what
|
|
* kind of statment it is based on that, only whether it is a system variable
|
|
* or not.
|
|
*
|
|
* Consequently, we just look at the string and deduce whether it is a
|
|
* set [ROLE|NAMES|PASSWORD|CHARACTER] statement.
|
|
*/
|
|
bool is_set_specific(const char* s)
|
|
{
|
|
bool rv = false;
|
|
|
|
// Remove space from the beginning.
|
|
while (isspace(*s))
|
|
{
|
|
++s;
|
|
}
|
|
|
|
const char* token = s;
|
|
|
|
// Find next non-space character.
|
|
while (!isspace(*s) && (*s != 0))
|
|
{
|
|
++s;
|
|
}
|
|
|
|
if (s - token == 3) // Might be "set"
|
|
{
|
|
if (strncasecmp(token, "set", 3) == 0)
|
|
{
|
|
// YES it was!
|
|
while (isspace(*s))
|
|
{
|
|
++s;
|
|
}
|
|
|
|
token = s;
|
|
|
|
while (!isspace(*s) && (*s != 0) && (*s != '='))
|
|
{
|
|
++s;
|
|
}
|
|
|
|
if (s - token == 4) // Might be "role"
|
|
{
|
|
if (strncasecmp(token, "role", 4) == 0)
|
|
{
|
|
// YES it was!
|
|
rv = true;
|
|
}
|
|
}
|
|
else if (s - token == 5) // Might be "names"
|
|
{
|
|
if (strncasecmp(token, "names", 5) == 0)
|
|
{
|
|
// YES it was!
|
|
rv = true;
|
|
}
|
|
}
|
|
else if (s - token == 8) // Might be "password
|
|
{
|
|
if (strncasecmp(token, "password", 8) == 0)
|
|
{
|
|
// YES it was!
|
|
rv = true;
|
|
}
|
|
}
|
|
else if (s - token == 9) // Might be "character"
|
|
{
|
|
if (strncasecmp(token, "character", 9) == 0)
|
|
{
|
|
// YES it was!
|
|
rv = true;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
return rv;
|
|
}
|
|
|
|
/**
|
|
* Detect query type by examining parsed representation of it.
|
|
*
|
|
* @param pi The parsing info.
|
|
* @param thd MariaDB thread context.
|
|
*
|
|
* @return Copy of query type value.
|
|
*
|
|
*
|
|
* @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.
|
|
*
|
|
*/
|
|
static uint32_t resolve_query_type(parsing_info_t *pi, THD* thd)
|
|
{
|
|
qc_query_type_t qtype = QUERY_TYPE_UNKNOWN;
|
|
uint32_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.
|
|
*/
|
|
#if defined(NOT_IN_USE)
|
|
bool force_data_modify_op_replication;
|
|
force_data_modify_op_replication = FALSE;
|
|
#endif /* NOT_IN_USE */
|
|
ss_info_dassert(thd != NULL, ("thd is NULL\n"));
|
|
|
|
lex = thd->lex;
|
|
|
|
/** SELECT ..INTO variable|OUTFILE|DUMPFILE */
|
|
if (lex->result != NULL)
|
|
{
|
|
type = QUERY_TYPE_GSYSVAR_WRITE;
|
|
goto return_qtype;
|
|
}
|
|
|
|
if (skygw_stmt_causes_implicit_commit(lex, &set_autocommit_stmt))
|
|
{
|
|
if (MXS_LOG_PRIORITY_IS_ENABLED(LOG_INFO))
|
|
{
|
|
if (sql_command_flags[lex->sql_command] &
|
|
CF_IMPLICT_COMMIT_BEGIN)
|
|
{
|
|
MXS_INFO("Implicit COMMIT before executing the next command.");
|
|
}
|
|
else if (sql_command_flags[lex->sql_command] &
|
|
CF_IMPLICIT_COMMIT_END)
|
|
{
|
|
MXS_INFO("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 (MXS_LOG_PRIORITY_IS_ENABLED(LOG_INFO))
|
|
{
|
|
MXS_INFO("Disable autocommit : implicit START TRANSACTION"
|
|
" before executing the next command.");
|
|
}
|
|
|
|
type |= QUERY_TYPE_DISABLE_AUTOCOMMIT;
|
|
type |= QUERY_TYPE_BEGIN_TRX;
|
|
}
|
|
|
|
if (lex->option_type == OPT_GLOBAL)
|
|
{
|
|
/**
|
|
* SHOW syntax http://dev.mysql.com/doc/refman/5.6/en/show.html
|
|
*/
|
|
if (lex->sql_command == SQLCOM_SHOW_VARIABLES)
|
|
{
|
|
type |= QUERY_TYPE_GSYSVAR_READ;
|
|
}
|
|
/**
|
|
* SET syntax http://dev.mysql.com/doc/refman/5.6/en/set-statement.html
|
|
*/
|
|
else if (lex->sql_command == SQLCOM_SET_OPTION)
|
|
{
|
|
type |= QUERY_TYPE_GSYSVAR_WRITE;
|
|
}
|
|
|
|
/*
|
|
* SHOW GLOBAL STATUS - Route to master
|
|
*/
|
|
else if (lex->sql_command == SQLCOM_SHOW_STATUS)
|
|
{
|
|
type = QUERY_TYPE_WRITE;
|
|
}
|
|
/**
|
|
* REVOKE ALL, ASSIGN_TO_KEYCACHE,
|
|
* PRELOAD_KEYS, FLUSH, RESET, CREATE|ALTER|DROP SERVER
|
|
*/
|
|
|
|
else
|
|
{
|
|
type |= QUERY_TYPE_GSYSVAR_WRITE;
|
|
}
|
|
|
|
goto return_qtype;
|
|
}
|
|
else if (lex->option_type == OPT_SESSION)
|
|
{
|
|
/**
|
|
* SHOW syntax http://dev.mysql.com/doc/refman/5.6/en/show.html
|
|
*/
|
|
if (lex->sql_command == SQLCOM_SHOW_VARIABLES)
|
|
{
|
|
type |= QUERY_TYPE_SYSVAR_READ;
|
|
}
|
|
/**
|
|
* SET syntax http://dev.mysql.com/doc/refman/5.6/en/set-statement.html
|
|
*/
|
|
else if (lex->sql_command == SQLCOM_SET_OPTION)
|
|
{
|
|
/** Either user- or system variable write */
|
|
if (is_set_specific(pi->pi_query_plain_str))
|
|
{
|
|
type |= QUERY_TYPE_GSYSVAR_WRITE;
|
|
}
|
|
else
|
|
{
|
|
List_iterator<set_var_base> ilist(lex->var_list);
|
|
size_t n = 0;
|
|
|
|
while (set_var_base *var = ilist++)
|
|
{
|
|
if (var->is_system())
|
|
{
|
|
type |= QUERY_TYPE_GSYSVAR_WRITE;
|
|
}
|
|
else
|
|
{
|
|
type |= QUERY_TYPE_USERVAR_WRITE;
|
|
}
|
|
++n;
|
|
}
|
|
|
|
if (n == 0)
|
|
{
|
|
type |= QUERY_TYPE_GSYSVAR_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 defined(NOT_IN_USE)
|
|
|
|
if (thd->variables.sql_log_bin == 0 &&
|
|
force_data_modify_op_replication)
|
|
{
|
|
/** Not replicated */
|
|
type |= QUERY_TYPE_SESSION_WRITE;
|
|
}
|
|
else
|
|
#endif /* NOT_IN_USE */
|
|
{
|
|
/** Written to binlog, that is, replicated except tmp tables */
|
|
type |= QUERY_TYPE_WRITE; /*< to master */
|
|
|
|
if (lex->sql_command == SQLCOM_CREATE_TABLE &&
|
|
(lex->create_info.options & HA_LEX_CREATE_TMP_TABLE))
|
|
{
|
|
type |= QUERY_TYPE_CREATE_TMP_TABLE; /*< remember in router */
|
|
}
|
|
}
|
|
}
|
|
|
|
/** Try to catch session modifications here */
|
|
switch (lex->sql_command)
|
|
{
|
|
case SQLCOM_EMPTY_QUERY:
|
|
type |= QUERY_TYPE_READ;
|
|
break;
|
|
|
|
case SQLCOM_CHANGE_DB:
|
|
type |= QUERY_TYPE_SESSION_WRITE;
|
|
break;
|
|
|
|
case SQLCOM_DEALLOCATE_PREPARE:
|
|
type |= QUERY_TYPE_WRITE;
|
|
break;
|
|
|
|
case SQLCOM_SELECT:
|
|
case SQLCOM_SHOW_SLAVE_STAT:
|
|
type |= QUERY_TYPE_READ;
|
|
break;
|
|
|
|
case SQLCOM_CALL:
|
|
type |= QUERY_TYPE_WRITE;
|
|
break;
|
|
|
|
case SQLCOM_BEGIN:
|
|
type |= QUERY_TYPE_BEGIN_TRX;
|
|
if (lex->start_transaction_opt & MYSQL_START_TRANS_OPT_READ_WRITE)
|
|
{
|
|
type |= QUERY_TYPE_WRITE;
|
|
}
|
|
else if (lex->start_transaction_opt & MYSQL_START_TRANS_OPT_READ_ONLY)
|
|
{
|
|
type |= QUERY_TYPE_READ;
|
|
}
|
|
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;
|
|
|
|
case SQLCOM_SHOW_DATABASES:
|
|
type |= QUERY_TYPE_SHOW_DATABASES;
|
|
goto return_qtype;
|
|
break;
|
|
|
|
case SQLCOM_SHOW_FIELDS:
|
|
type |= QUERY_TYPE_READ;
|
|
break;
|
|
|
|
case SQLCOM_SHOW_TABLES:
|
|
type |= QUERY_TYPE_SHOW_TABLES;
|
|
goto return_qtype;
|
|
break;
|
|
|
|
default:
|
|
type |= QUERY_TYPE_WRITE;
|
|
break;
|
|
}
|
|
|
|
#if defined(UPDATE_VAR_SUPPORT)
|
|
|
|
if (QTYPE_LESS_RESTRICTIVE_THAN_WRITE(type))
|
|
#endif
|
|
// TODO: This test is meaningless, since at this point
|
|
// TODO: qtype (not type) is QUERY_TYPE_UNKNOWN.
|
|
if (qc_query_is_type(qtype, QUERY_TYPE_UNKNOWN) ||
|
|
qc_query_is_type(qtype, QUERY_TYPE_LOCAL_READ) ||
|
|
qc_query_is_type(qtype, QUERY_TYPE_READ) ||
|
|
qc_query_is_type(qtype, QUERY_TYPE_USERVAR_READ) ||
|
|
qc_query_is_type(qtype, QUERY_TYPE_SYSVAR_READ) ||
|
|
qc_query_is_type(qtype, QUERY_TYPE_GSYSVAR_READ))
|
|
{
|
|
/**
|
|
* 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 need 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();
|
|
MXS_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;
|
|
MXS_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;
|
|
MXS_DEBUG("%lu [resolve_query_type] "
|
|
"functype UDF_FUNC, user-defined "
|
|
"function.",
|
|
pthread_self());
|
|
break;
|
|
|
|
case Item_func::NOW_FUNC:
|
|
// If this is part of a CREATE TABLE, then local read is not
|
|
// applicable.
|
|
if (lex->sql_command != SQLCOM_CREATE_TABLE)
|
|
{
|
|
func_qtype |= QUERY_TYPE_LOCAL_READ;
|
|
MXS_DEBUG("%lu [resolve_query_type] "
|
|
"functype NOW_FUNC, could be "
|
|
"executed in MaxScale.",
|
|
pthread_self());
|
|
}
|
|
break;
|
|
|
|
/** System session variable */
|
|
case Item_func::GSYSVAR_FUNC:
|
|
{
|
|
const char* name = item->name;
|
|
if (name &&
|
|
((strcasecmp(name, "@@last_insert_id") == 0) ||
|
|
(strcasecmp(name, "@@identity") == 0)))
|
|
{
|
|
func_qtype |= QUERY_TYPE_MASTER_READ;
|
|
}
|
|
else
|
|
{
|
|
func_qtype |= QUERY_TYPE_SYSVAR_READ;
|
|
}
|
|
MXS_DEBUG("%lu [resolve_query_type] "
|
|
"functype GSYSVAR_FUNC, system "
|
|
"variable read.",
|
|
pthread_self());
|
|
}
|
|
break;
|
|
|
|
/** User-defined variable read */
|
|
case Item_func::GUSERVAR_FUNC:
|
|
func_qtype |= QUERY_TYPE_USERVAR_READ;
|
|
MXS_DEBUG("%lu [resolve_query_type] "
|
|
"functype GUSERVAR_FUNC, user "
|
|
"variable read.",
|
|
pthread_self());
|
|
break;
|
|
|
|
/** User-defined variable modification */
|
|
case Item_func::SUSERVAR_FUNC:
|
|
func_qtype |= QUERY_TYPE_USERVAR_WRITE;
|
|
MXS_DEBUG("%lu [resolve_query_type] "
|
|
"functype SUSERVAR_FUNC, user "
|
|
"variable write.",
|
|
pthread_self());
|
|
break;
|
|
|
|
case Item_func::UNKNOWN_FUNC:
|
|
|
|
if (((Item_func*) item)->func_name() != NULL &&
|
|
strcmp((char*) ((Item_func*) item)->func_name(), "last_insert_id") == 0)
|
|
{
|
|
func_qtype |= QUERY_TYPE_MASTER_READ;
|
|
}
|
|
else
|
|
{
|
|
func_qtype |= QUERY_TYPE_READ;
|
|
}
|
|
|
|
/**
|
|
* Many built-in functions are of this
|
|
* type, for example, rand(), soundex(),
|
|
* repeat() .
|
|
*/
|
|
MXS_DEBUG("%lu [resolve_query_type] "
|
|
"functype UNKNOWN_FUNC, "
|
|
"typically some system function.",
|
|
pthread_self());
|
|
break;
|
|
|
|
default:
|
|
MXS_DEBUG("%lu [resolve_query_type] "
|
|
"Functype %d.",
|
|
pthread_self(),
|
|
ftype);
|
|
break;
|
|
} /**< switch */
|
|
|
|
/**< Set new query type */
|
|
type |= func_qtype;
|
|
}
|
|
|
|
#if defined(UPDATE_VAR_SUPPORT)
|
|
|
|
/**
|
|
* Write is as restrictive as it gets due functions,
|
|
* so break.
|
|
*/
|
|
if ((type & QUERY_TYPE_WRITE) == QUERY_TYPE_WRITE)
|
|
{
|
|
break;
|
|
}
|
|
|
|
#endif
|
|
} /**< for */
|
|
} /**< if */
|
|
|
|
return_qtype:
|
|
qtype = (qc_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.
|
|
*
|
|
* @param lex Parse tree
|
|
* @param autocommit_stmt memory address for autocommit status
|
|
*
|
|
* @return true if statement causes implicit commit and false otherwise
|
|
*/
|
|
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->create_info.options & HA_LEX_CREATE_TMP_TABLE);
|
|
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.
|
|
*
|
|
* @param lex parse tree
|
|
*
|
|
* @return 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;
|
|
}
|
|
|
|
#if defined(NOT_USED)
|
|
|
|
char* qc_get_stmtname(GWBUF* buf)
|
|
{
|
|
MYSQL* mysql;
|
|
|
|
if (buf == NULL ||
|
|
buf->gwbuf_bufobj == NULL ||
|
|
buf->gwbuf_bufobj->bo_data == NULL ||
|
|
(mysql = (MYSQL *) ((parsing_info_t *) buf->gwbuf_bufobj->bo_data)->pi_handle) == NULL ||
|
|
mysql->thd == NULL ||
|
|
(THD *) (mysql->thd))->lex == NULL ||
|
|
(THD *) (mysql->thd))->lex->prepared_stmt_name == NULL)
|
|
{
|
|
return NULL;
|
|
}
|
|
|
|
return ((THD *) (mysql->thd))->lex->prepared_stmt_name.str;
|
|
}
|
|
#endif
|
|
|
|
/**
|
|
* Get the parsing info structure from a GWBUF
|
|
*
|
|
* @param querybuf A GWBUF
|
|
*
|
|
* @return The parsing info object, or NULL
|
|
*/
|
|
parsing_info_t* get_pinfo(GWBUF* querybuf)
|
|
{
|
|
parsing_info_t *pi = NULL;
|
|
|
|
if ((querybuf != NULL) && GWBUF_IS_PARSED(querybuf))
|
|
{
|
|
pi = (parsing_info_t *) gwbuf_get_buffer_object_data(querybuf, GWBUF_PARSING_INFO);
|
|
}
|
|
|
|
return pi;
|
|
}
|
|
|
|
LEX* get_lex(parsing_info_t* pi)
|
|
{
|
|
MYSQL* mysql = (MYSQL *) pi->pi_handle;
|
|
ss_dassert(mysql);
|
|
THD* thd = (THD *) mysql->thd;
|
|
ss_dassert(thd);
|
|
|
|
return thd->lex;
|
|
}
|
|
|
|
/**
|
|
* Get the parse tree from parsed querybuf.
|
|
* @param querybuf The parsed GWBUF
|
|
*
|
|
* @return Pointer to the LEX struct or NULL if an error occurred or the query
|
|
* was not parsed
|
|
*/
|
|
LEX* get_lex(GWBUF* querybuf)
|
|
{
|
|
LEX* lex = NULL;
|
|
parsing_info_t* pi = get_pinfo(querybuf);
|
|
|
|
if (pi)
|
|
{
|
|
MYSQL* mysql = (MYSQL *) pi->pi_handle;
|
|
ss_dassert(mysql);
|
|
THD* thd = (THD *) mysql->thd;
|
|
ss_dassert(thd);
|
|
lex = thd->lex;
|
|
}
|
|
|
|
return lex;
|
|
}
|
|
|
|
/**
|
|
* Finds the head of the list of tables affected by the current select statement.
|
|
* @param thd Pointer to a valid THD
|
|
* @return Pointer to the head of the TABLE_LIST chain or NULL in case of an error
|
|
*/
|
|
static TABLE_LIST* skygw_get_affected_tables(void* lexptr)
|
|
{
|
|
LEX* lex = (LEX*) lexptr;
|
|
|
|
if (lex == NULL || lex->current_select == NULL)
|
|
{
|
|
ss_dassert(lex != NULL && lex->current_select != NULL);
|
|
return NULL;
|
|
}
|
|
|
|
TABLE_LIST *tbl = lex->current_select->table_list.first;
|
|
|
|
if (tbl && tbl->schema_select_lex && tbl->schema_select_lex->table_list.elements &&
|
|
lex->sql_command != SQLCOM_SHOW_KEYS)
|
|
{
|
|
/**
|
|
* Some statements e.g. EXPLAIN or SHOW COLUMNS give `information_schema`
|
|
* as the underlying table and the table in the query is stored in
|
|
* @c schema_select_lex.
|
|
*
|
|
* SHOW [KEYS | INDEX] does the reverse so we need to skip the
|
|
* @c schema_select_lex when processing a SHOW [KEYS | INDEX] statement.
|
|
*/
|
|
tbl = tbl->schema_select_lex->table_list.first;
|
|
}
|
|
|
|
return tbl;
|
|
}
|
|
|
|
int32_t qc_mysql_get_table_names(GWBUF* querybuf, int32_t fullnames, char*** tablesp, int32_t* tblsize)
|
|
{
|
|
LEX* lex;
|
|
TABLE_LIST* tbl;
|
|
int i = 0, currtblsz = 0;
|
|
char **tables = NULL, **tmp = NULL;
|
|
|
|
if (querybuf == NULL || tblsize == NULL)
|
|
{
|
|
goto retblock;
|
|
}
|
|
|
|
if (!ensure_query_is_parsed(querybuf))
|
|
{
|
|
goto retblock;
|
|
}
|
|
|
|
if ((lex = get_lex(querybuf)) == NULL)
|
|
{
|
|
goto retblock;
|
|
}
|
|
|
|
lex->current_select = lex->all_selects_list;
|
|
|
|
while (lex->current_select)
|
|
{
|
|
tbl = skygw_get_affected_tables(lex);
|
|
|
|
while (tbl)
|
|
{
|
|
if (i >= currtblsz)
|
|
{
|
|
tmp = (char**) malloc(sizeof (char*) * (currtblsz * 2 + 1));
|
|
|
|
if (tmp)
|
|
{
|
|
if (currtblsz > 0)
|
|
{
|
|
for (int x = 0; x < currtblsz; x++)
|
|
{
|
|
tmp[x] = tables[x];
|
|
}
|
|
|
|
free(tables);
|
|
}
|
|
|
|
tables = tmp;
|
|
currtblsz = currtblsz * 2 + 1;
|
|
}
|
|
}
|
|
|
|
if (tmp != NULL)
|
|
{
|
|
char *catnm = NULL;
|
|
|
|
if (fullnames)
|
|
{
|
|
if (tbl->db &&
|
|
(strcmp(tbl->db, "skygw_virtual") != 0) &&
|
|
(strcmp(tbl->table_name, "*") != 0))
|
|
{
|
|
catnm = (char*) calloc(strlen(tbl->db) +
|
|
strlen(tbl->table_name) +
|
|
2,
|
|
sizeof (char));
|
|
strcpy(catnm, tbl->db);
|
|
strcat(catnm, ".");
|
|
strcat(catnm, tbl->table_name);
|
|
}
|
|
}
|
|
|
|
if (catnm)
|
|
{
|
|
tables[i++] = catnm;
|
|
}
|
|
else
|
|
{
|
|
// Sometimes the tablename is "*"; we exclude that.
|
|
if (strcmp(tbl->table_name, "*") != 0)
|
|
{
|
|
tables[i++] = strdup(tbl->table_name);
|
|
}
|
|
}
|
|
|
|
tbl = tbl->next_local;
|
|
}
|
|
} /*< while (tbl) */
|
|
|
|
lex->current_select = lex->current_select->next_select_in_list();
|
|
} /*< while(lex->current_select) */
|
|
|
|
retblock:
|
|
*tblsize = i;
|
|
*tablesp = tables;
|
|
|
|
return QC_RESULT_OK;
|
|
}
|
|
|
|
int32_t qc_mysql_get_created_table_name(GWBUF* querybuf, char** table_name)
|
|
{
|
|
*table_name = NULL;
|
|
|
|
if (querybuf == NULL)
|
|
{
|
|
return QC_RESULT_OK;
|
|
}
|
|
|
|
if (!ensure_query_is_parsed(querybuf))
|
|
{
|
|
return QC_RESULT_ERROR;
|
|
}
|
|
|
|
LEX* lex = get_lex(querybuf);
|
|
|
|
if (lex && (lex->sql_command == SQLCOM_CREATE_TABLE))
|
|
{
|
|
if (lex->create_last_non_select_table &&
|
|
lex->create_last_non_select_table->table_name)
|
|
{
|
|
*table_name = strdup(lex->create_last_non_select_table->table_name);
|
|
}
|
|
}
|
|
|
|
return QC_RESULT_OK;
|
|
}
|
|
|
|
int32_t qc_mysql_is_drop_table_query(GWBUF* querybuf, int32_t* answer)
|
|
{
|
|
*answer = 0;
|
|
|
|
if (querybuf)
|
|
{
|
|
if (ensure_query_is_parsed(querybuf))
|
|
{
|
|
LEX* lex = get_lex(querybuf);
|
|
|
|
*answer = lex && lex->sql_command == SQLCOM_DROP_TABLE;
|
|
}
|
|
}
|
|
|
|
return QC_RESULT_OK;
|
|
}
|
|
|
|
int32_t qc_mysql_query_has_clause(GWBUF* buf, int32_t* has_clause)
|
|
{
|
|
*has_clause = false;
|
|
|
|
if (buf)
|
|
{
|
|
if (ensure_query_is_parsed(buf))
|
|
{
|
|
LEX* lex = get_lex(buf);
|
|
|
|
if (lex)
|
|
{
|
|
SELECT_LEX* current = lex->all_selects_list;
|
|
|
|
while (current && !*has_clause)
|
|
{
|
|
if (current->where || current->having)
|
|
{
|
|
*has_clause = true;
|
|
}
|
|
|
|
current = current->next_select_in_list();
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
return QC_RESULT_OK;
|
|
}
|
|
|
|
/**
|
|
* 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
|
|
*/
|
|
static 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);
|
|
|
|
if (mysql == NULL)
|
|
{
|
|
MXS_ERROR("Call to mysql_real_connect failed due %d, %s.",
|
|
mysql_errno(mysql),
|
|
mysql_error(mysql));
|
|
ss_dassert(mysql != NULL);
|
|
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
|
|
*
|
|
*/
|
|
static void parsing_info_done(void* ptr)
|
|
{
|
|
parsing_info_t* pi;
|
|
THD* thd;
|
|
|
|
if (ptr)
|
|
{
|
|
pi = (parsing_info_t *) ptr;
|
|
|
|
if (pi->pi_handle != NULL)
|
|
{
|
|
MYSQL* mysql = (MYSQL *) pi->pi_handle;
|
|
|
|
if (mysql->thd != NULL)
|
|
{
|
|
thd = (THD*) mysql->thd;
|
|
thd->end_statement();
|
|
(*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);
|
|
}
|
|
|
|
for (size_t i = 0; i < pi->field_infos_len; ++i)
|
|
{
|
|
free(pi->field_infos[i].database);
|
|
free(pi->field_infos[i].table);
|
|
free(pi->field_infos[i].column);
|
|
}
|
|
free(pi->field_infos);
|
|
|
|
for (size_t i = 0; i < pi->function_infos_len; ++i)
|
|
{
|
|
free(pi->function_infos[i].name);
|
|
}
|
|
free(pi->function_infos);
|
|
|
|
gwbuf_free(pi->preparable_stmt);
|
|
|
|
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;
|
|
}
|
|
|
|
int32_t qc_mysql_get_database_names(GWBUF* querybuf, char*** databasesp, int* size)
|
|
{
|
|
LEX* lex;
|
|
TABLE_LIST* tbl;
|
|
char **databases = NULL, **tmp = NULL;
|
|
int currsz = 0, i = 0;
|
|
|
|
if (!querybuf)
|
|
{
|
|
goto retblock;
|
|
}
|
|
|
|
if (!ensure_query_is_parsed(querybuf))
|
|
{
|
|
goto retblock;
|
|
}
|
|
|
|
if ((lex = get_lex(querybuf)) == NULL)
|
|
{
|
|
goto retblock;
|
|
}
|
|
|
|
lex->current_select = lex->all_selects_list;
|
|
|
|
while (lex->current_select)
|
|
{
|
|
tbl = lex->current_select->table_list.first;
|
|
|
|
while (tbl)
|
|
{
|
|
if (lex->sql_command == SQLCOM_SHOW_FIELDS)
|
|
{
|
|
// If we are describing, we want the actual table, not the information_schema.
|
|
if (tbl->schema_select_lex)
|
|
{
|
|
tbl = tbl->schema_select_lex->table_list.first;
|
|
}
|
|
}
|
|
|
|
// The database is sometimes an empty string. So as not to return
|
|
// an array of empty strings, we need to check for that possibility.
|
|
if ((strcmp(tbl->db, "skygw_virtual") != 0) && (*tbl->db != 0))
|
|
{
|
|
if (i >= currsz)
|
|
{
|
|
tmp = (char**) realloc(databases,
|
|
sizeof (char*) * (currsz * 2 + 1));
|
|
|
|
if (tmp == NULL)
|
|
{
|
|
goto retblock;
|
|
}
|
|
|
|
databases = tmp;
|
|
currsz = currsz * 2 + 1;
|
|
}
|
|
|
|
databases[i++] = strdup(tbl->db);
|
|
}
|
|
|
|
tbl = tbl->next_local;
|
|
}
|
|
|
|
lex->current_select = lex->current_select->next_select_in_list();
|
|
}
|
|
|
|
retblock:
|
|
*size = i;
|
|
*databasesp = databases;
|
|
|
|
return QC_RESULT_OK;
|
|
}
|
|
|
|
int32_t qc_mysql_get_operation(GWBUF* querybuf, int32_t* operation)
|
|
{
|
|
*operation = QUERY_OP_UNDEFINED;
|
|
|
|
if (querybuf)
|
|
{
|
|
if (ensure_query_is_parsed(querybuf))
|
|
{
|
|
LEX* lex = get_lex(querybuf);
|
|
|
|
if (lex)
|
|
{
|
|
switch (lex->sql_command)
|
|
{
|
|
case SQLCOM_SELECT:
|
|
*operation = QUERY_OP_SELECT;
|
|
break;
|
|
|
|
case SQLCOM_CREATE_DB:
|
|
case SQLCOM_CREATE_EVENT:
|
|
case SQLCOM_CREATE_FUNCTION:
|
|
case SQLCOM_CREATE_INDEX:
|
|
case SQLCOM_CREATE_PROCEDURE:
|
|
case SQLCOM_CREATE_SERVER:
|
|
case SQLCOM_CREATE_SPFUNCTION:
|
|
case SQLCOM_CREATE_TABLE:
|
|
case SQLCOM_CREATE_TRIGGER:
|
|
case SQLCOM_CREATE_USER:
|
|
case SQLCOM_CREATE_VIEW:
|
|
*operation = QUERY_OP_CREATE;
|
|
break;
|
|
|
|
case SQLCOM_ALTER_DB:
|
|
case SQLCOM_ALTER_DB_UPGRADE:
|
|
case SQLCOM_ALTER_EVENT:
|
|
case SQLCOM_ALTER_FUNCTION:
|
|
case SQLCOM_ALTER_PROCEDURE:
|
|
case SQLCOM_ALTER_SERVER:
|
|
case SQLCOM_ALTER_TABLE:
|
|
case SQLCOM_ALTER_TABLESPACE:
|
|
*operation = QUERY_OP_ALTER;
|
|
break;
|
|
|
|
case SQLCOM_UPDATE:
|
|
case SQLCOM_UPDATE_MULTI:
|
|
*operation = QUERY_OP_UPDATE;
|
|
break;
|
|
|
|
case SQLCOM_INSERT:
|
|
case SQLCOM_INSERT_SELECT:
|
|
case SQLCOM_REPLACE:
|
|
case SQLCOM_REPLACE_SELECT:
|
|
*operation = QUERY_OP_INSERT;
|
|
break;
|
|
|
|
case SQLCOM_DELETE:
|
|
case SQLCOM_DELETE_MULTI:
|
|
*operation = QUERY_OP_DELETE;
|
|
break;
|
|
|
|
case SQLCOM_TRUNCATE:
|
|
*operation = QUERY_OP_TRUNCATE;
|
|
break;
|
|
|
|
case SQLCOM_DROP_DB:
|
|
case SQLCOM_DROP_EVENT:
|
|
case SQLCOM_DROP_FUNCTION:
|
|
case SQLCOM_DROP_INDEX:
|
|
case SQLCOM_DROP_PROCEDURE:
|
|
case SQLCOM_DROP_SERVER:
|
|
case SQLCOM_DROP_TABLE:
|
|
case SQLCOM_DROP_TRIGGER:
|
|
case SQLCOM_DROP_USER:
|
|
case SQLCOM_DROP_VIEW:
|
|
*operation = QUERY_OP_DROP;
|
|
break;
|
|
|
|
case SQLCOM_CHANGE_DB:
|
|
*operation = QUERY_OP_CHANGE_DB;
|
|
break;
|
|
|
|
case SQLCOM_LOAD:
|
|
*operation = QUERY_OP_LOAD;
|
|
break;
|
|
|
|
case SQLCOM_GRANT:
|
|
*operation = QUERY_OP_GRANT;
|
|
break;
|
|
|
|
case SQLCOM_REVOKE:
|
|
case SQLCOM_REVOKE_ALL:
|
|
*operation = QUERY_OP_REVOKE;
|
|
break;
|
|
|
|
default:
|
|
*operation = QUERY_OP_UNDEFINED;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
return QC_RESULT_OK;
|
|
}
|
|
|
|
int32_t qc_mysql_get_prepare_name(GWBUF* stmt, char** namep)
|
|
{
|
|
char* name = NULL;
|
|
|
|
if (stmt)
|
|
{
|
|
if (ensure_query_is_parsed(stmt))
|
|
{
|
|
LEX* lex = get_lex(stmt);
|
|
|
|
if ((lex->sql_command == SQLCOM_PREPARE) ||
|
|
(lex->sql_command == SQLCOM_EXECUTE) ||
|
|
(lex->sql_command == SQLCOM_DEALLOCATE_PREPARE))
|
|
{
|
|
name = (char*)malloc(lex->prepared_stmt_name.length + 1);
|
|
if (name)
|
|
{
|
|
memcpy(name, lex->prepared_stmt_name.str, lex->prepared_stmt_name.length);
|
|
name[lex->prepared_stmt_name.length] = 0;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
*namep = name;
|
|
|
|
return QC_RESULT_OK;
|
|
}
|
|
|
|
int32_t qc_mysql_get_preparable_stmt(GWBUF* stmt, GWBUF** preparable_stmt)
|
|
{
|
|
if (stmt)
|
|
{
|
|
if (ensure_query_is_parsed(stmt))
|
|
{
|
|
LEX* lex = get_lex(stmt);
|
|
|
|
if (lex->sql_command == SQLCOM_PREPARE)
|
|
{
|
|
parsing_info_t* pi = get_pinfo(stmt);
|
|
|
|
if (!pi->preparable_stmt)
|
|
{
|
|
const char* preparable_stmt = lex->prepared_stmt_code.str;
|
|
size_t preparable_stmt_len = lex->prepared_stmt_code.length;
|
|
size_t payload_len = preparable_stmt_len + 1;
|
|
size_t packet_len = MYSQL_HEADER_LEN + payload_len;
|
|
|
|
GWBUF* preperable_packet = gwbuf_alloc(packet_len);
|
|
|
|
if (preperable_packet)
|
|
{
|
|
// Encode the length of the payload in the 3 first bytes.
|
|
*((unsigned char*)GWBUF_DATA(preperable_packet) + 0) = payload_len;
|
|
*((unsigned char*)GWBUF_DATA(preperable_packet) + 1) = (payload_len >> 8);
|
|
*((unsigned char*)GWBUF_DATA(preperable_packet) + 2) = (payload_len >> 16);
|
|
// Sequence id
|
|
*((unsigned char*)GWBUF_DATA(preperable_packet) + 3) = 0x00;
|
|
// Payload, starts with command.
|
|
*((unsigned char*)GWBUF_DATA(preperable_packet) + 4) = COM_QUERY;
|
|
// Is followed by the statement.
|
|
char *s = (char*)GWBUF_DATA(preperable_packet) + 5;
|
|
|
|
// We copy the statment, blindly replacing all '?':s with '0':s as
|
|
// otherwise the parsing of the preparable statement as a regular
|
|
// statement will not always succeed.
|
|
const char* p = preparable_stmt;
|
|
while (p < preparable_stmt + preparable_stmt_len)
|
|
{
|
|
if (*p == '?')
|
|
{
|
|
*s = '0';
|
|
}
|
|
else
|
|
{
|
|
*s = *p;
|
|
}
|
|
|
|
++p;
|
|
++s;
|
|
}
|
|
}
|
|
|
|
pi->preparable_stmt = preperable_packet;
|
|
}
|
|
|
|
*preparable_stmt = pi->preparable_stmt;
|
|
}
|
|
}
|
|
}
|
|
|
|
return QC_RESULT_OK;
|
|
}
|
|
|
|
static bool should_exclude(const char* name, List<Item>* excludep)
|
|
{
|
|
bool exclude = false;
|
|
List_iterator<Item> ilist(*excludep);
|
|
Item* exclude_item;
|
|
|
|
while (!exclude && (exclude_item = ilist++))
|
|
{
|
|
const char* exclude_name = exclude_item->name;
|
|
|
|
if (exclude_name && (strcasecmp(name, exclude_name) == 0))
|
|
{
|
|
exclude = true;
|
|
}
|
|
|
|
if (!exclude)
|
|
{
|
|
exclude_name = strrchr(exclude_item->full_name(), '.');
|
|
|
|
if (exclude_name)
|
|
{
|
|
++exclude_name; // Char after the '.'
|
|
|
|
if (strcasecmp(name, exclude_name) == 0)
|
|
{
|
|
exclude = true;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
return exclude;
|
|
}
|
|
|
|
static void add_field_info(parsing_info_t* info,
|
|
const char* database,
|
|
const char* table,
|
|
const char* column,
|
|
uint32_t usage,
|
|
List<Item>* excludep)
|
|
{
|
|
ss_dassert(column);
|
|
|
|
QC_FIELD_INFO item = { (char*)database, (char*)table, (char*)column, usage };
|
|
|
|
size_t i;
|
|
for (i = 0; i < info->field_infos_len; ++i)
|
|
{
|
|
QC_FIELD_INFO* field_info = info->field_infos + i;
|
|
|
|
if (strcasecmp(item.column, field_info->column) == 0)
|
|
{
|
|
if (!item.table && !field_info->table)
|
|
{
|
|
ss_dassert(!item.database && !field_info->database);
|
|
break;
|
|
}
|
|
else if (item.table && field_info->table && (strcmp(item.table, field_info->table) == 0))
|
|
{
|
|
if (!item.database && !field_info->database)
|
|
{
|
|
break;
|
|
}
|
|
else if (item.database &&
|
|
field_info->database &&
|
|
(strcmp(item.database, field_info->database) == 0))
|
|
{
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
QC_FIELD_INFO* field_infos = NULL;
|
|
|
|
if (i == info->field_infos_len) // If true, the field was not present already.
|
|
{
|
|
// If only a column is specified, but not a table or database and we
|
|
// have a list of expressions that should be excluded, we check if the column
|
|
// value is present in that list. This is in order to exclude the second "d" in
|
|
// a statement like "select a as d from x where d = 2".
|
|
if (!(column && !table && !database && excludep && should_exclude(column, excludep)))
|
|
{
|
|
if (info->field_infos_len < info->field_infos_capacity)
|
|
{
|
|
field_infos = info->field_infos;
|
|
}
|
|
else
|
|
{
|
|
size_t capacity = info->field_infos_capacity ? 2 * info->field_infos_capacity : 8;
|
|
field_infos = (QC_FIELD_INFO*)realloc(info->field_infos, capacity * sizeof(QC_FIELD_INFO));
|
|
|
|
if (field_infos)
|
|
{
|
|
info->field_infos = field_infos;
|
|
info->field_infos_capacity = capacity;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
else
|
|
{
|
|
info->field_infos[i].usage |= usage;
|
|
}
|
|
|
|
// If field_infos is NULL, then the field was found and has already been noted.
|
|
if (field_infos)
|
|
{
|
|
item.database = item.database ? strdup(item.database) : NULL;
|
|
item.table = item.table ? strdup(item.table) : NULL;
|
|
ss_dassert(item.column);
|
|
item.column = strdup(item.column);
|
|
|
|
// We are happy if we at least could dup the column.
|
|
|
|
if (item.column)
|
|
{
|
|
field_infos[info->field_infos_len++] = item;
|
|
}
|
|
}
|
|
}
|
|
|
|
static void add_function_info(parsing_info_t* info,
|
|
const char* name,
|
|
uint32_t usage)
|
|
{
|
|
ss_dassert(name);
|
|
|
|
QC_FUNCTION_INFO item = { (char*)name, usage };
|
|
|
|
size_t i;
|
|
for (i = 0; i < info->function_infos_len; ++i)
|
|
{
|
|
QC_FUNCTION_INFO* function_info = info->function_infos + i;
|
|
|
|
if (strcasecmp(item.name, function_info->name) == 0)
|
|
{
|
|
break;
|
|
}
|
|
}
|
|
|
|
QC_FUNCTION_INFO* function_infos = NULL;
|
|
|
|
if (i == info->function_infos_len) // If true, the function was not present already.
|
|
{
|
|
if (info->function_infos_len < info->function_infos_capacity)
|
|
{
|
|
function_infos = info->function_infos;
|
|
}
|
|
else
|
|
{
|
|
size_t capacity = info->function_infos_capacity ? 2 * info->function_infos_capacity : 8;
|
|
function_infos = (QC_FUNCTION_INFO*)realloc(info->function_infos,
|
|
capacity * sizeof(QC_FUNCTION_INFO));
|
|
|
|
if (function_infos)
|
|
{
|
|
info->function_infos = function_infos;
|
|
info->function_infos_capacity = capacity;
|
|
}
|
|
}
|
|
}
|
|
else
|
|
{
|
|
info->function_infos[i].usage |= usage;
|
|
}
|
|
|
|
// If function_infos is NULL, then the function was found and has already been noted.
|
|
if (function_infos)
|
|
{
|
|
item.name = strdup(item.name);
|
|
|
|
if (item.name)
|
|
{
|
|
function_infos[info->function_infos_len++] = item;
|
|
}
|
|
}
|
|
}
|
|
|
|
static void add_field_info(parsing_info_t* pi, Item_field* item, uint32_t usage, List<Item>* excludep)
|
|
{
|
|
const char* database = item->db_name;
|
|
const char* table = item->table_name;
|
|
const char* column = item->field_name;
|
|
|
|
LEX* lex = get_lex(pi);
|
|
|
|
switch (lex->sql_command)
|
|
{
|
|
case SQLCOM_SHOW_FIELDS:
|
|
if (!database)
|
|
{
|
|
database = "information_schema";
|
|
}
|
|
|
|
if (!table)
|
|
{
|
|
table = "COLUMNS";
|
|
}
|
|
break;
|
|
|
|
case SQLCOM_SHOW_KEYS:
|
|
if (!database)
|
|
{
|
|
database = "information_schema";
|
|
}
|
|
|
|
if (!table)
|
|
{
|
|
table = "STATISTICS";
|
|
}
|
|
break;
|
|
|
|
case SQLCOM_SHOW_STATUS:
|
|
if (!database)
|
|
{
|
|
database = "information_schema";
|
|
}
|
|
|
|
if (!table)
|
|
{
|
|
table = "SESSION_STATUS";
|
|
}
|
|
break;
|
|
|
|
case SQLCOM_SHOW_TABLES:
|
|
if (!database)
|
|
{
|
|
database = "information_schema";
|
|
}
|
|
|
|
if (!table)
|
|
{
|
|
table = "TABLE_NAMES";
|
|
}
|
|
break;
|
|
|
|
case SQLCOM_SHOW_TABLE_STATUS:
|
|
if (!database)
|
|
{
|
|
database = "information_schema";
|
|
}
|
|
|
|
if (!table)
|
|
{
|
|
table = "TABLES";
|
|
}
|
|
break;
|
|
|
|
case SQLCOM_SHOW_VARIABLES:
|
|
if (!database)
|
|
{
|
|
database = "information_schema";
|
|
}
|
|
|
|
if (!table)
|
|
{
|
|
table = "SESSION_STATUS";
|
|
}
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
|
|
add_field_info(pi, database, table, column, usage, excludep);
|
|
}
|
|
|
|
static void add_field_info(parsing_info_t* pi, Item* item, uint32_t usage, List<Item>* excludep)
|
|
{
|
|
const char* database = NULL;
|
|
const char* table = NULL;
|
|
const char* column = item->name;
|
|
|
|
add_field_info(pi, database, table, column, usage, excludep);
|
|
}
|
|
|
|
typedef enum collect_source
|
|
{
|
|
COLLECT_SELECT,
|
|
COLLECT_WHERE,
|
|
COLLECT_HAVING,
|
|
COLLECT_GROUP_BY,
|
|
} collect_source_t;
|
|
|
|
static void update_field_infos(parsing_info_t* pi,
|
|
LEX* lex,
|
|
st_select_lex* select,
|
|
uint32_t usage,
|
|
List<Item>* excludep);
|
|
|
|
static void remove_surrounding_back_ticks(char* s)
|
|
{
|
|
size_t len = strlen(s);
|
|
|
|
if (*s == '`')
|
|
{
|
|
--len;
|
|
memmove(s, s + 1, len);
|
|
s[len] = 0;
|
|
}
|
|
|
|
if (s[len - 1] == '`')
|
|
{
|
|
s[len - 1] = 0;
|
|
}
|
|
}
|
|
|
|
static void update_field_infos(parsing_info_t* pi,
|
|
collect_source_t source,
|
|
Item* item,
|
|
uint32_t usage,
|
|
List<Item>* excludep)
|
|
{
|
|
switch (item->type())
|
|
{
|
|
case Item::COND_ITEM:
|
|
{
|
|
Item_cond* cond_item = static_cast<Item_cond*>(item);
|
|
List_iterator<Item> ilist(*cond_item->argument_list());
|
|
|
|
while (Item *i = ilist++)
|
|
{
|
|
update_field_infos(pi, source, i, usage, excludep);
|
|
}
|
|
}
|
|
break;
|
|
|
|
case Item::FIELD_ITEM:
|
|
add_field_info(pi, static_cast<Item_field*>(item), usage, excludep);
|
|
break;
|
|
|
|
case Item::REF_ITEM:
|
|
{
|
|
if (source != COLLECT_SELECT)
|
|
{
|
|
Item_ref* ref_item = static_cast<Item_ref*>(item);
|
|
|
|
add_field_info(pi, item, usage, excludep);
|
|
|
|
size_t n_items = ref_item->cols();
|
|
|
|
for (size_t i = 0; i < n_items; ++i)
|
|
{
|
|
Item* reffed_item = ref_item->element_index(i);
|
|
|
|
if (reffed_item != ref_item)
|
|
{
|
|
update_field_infos(pi, source, ref_item->element_index(i), usage, excludep);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
break;
|
|
|
|
case Item::ROW_ITEM:
|
|
{
|
|
Item_row* row_item = static_cast<Item_row*>(item);
|
|
size_t n_items = row_item->cols();
|
|
|
|
for (size_t i = 0; i < n_items; ++i)
|
|
{
|
|
update_field_infos(pi, source, row_item->element_index(i), usage, excludep);
|
|
}
|
|
}
|
|
break;
|
|
|
|
case Item::FUNC_ITEM:
|
|
case Item::SUM_FUNC_ITEM:
|
|
{
|
|
Item_func* func_item = static_cast<Item_func*>(item);
|
|
Item** items = func_item->arguments();
|
|
size_t n_items = func_item->argument_count();
|
|
|
|
// From comment in Item_func_or_sum(server/sql/item.h) abount the
|
|
// func_name() member function:
|
|
/*
|
|
This method is used for debug purposes to print the name of an
|
|
item to the debug log. The second use of this method is as
|
|
a helper function of print() and error messages, where it is
|
|
applicable. To suit both goals it should return a meaningful,
|
|
distinguishable and sintactically correct string. This method
|
|
should not be used for runtime type identification, use enum
|
|
{Sum}Functype and Item_func::functype()/Item_sum::sum_func()
|
|
instead.
|
|
Added here, to the parent class of both Item_func and Item_sum.
|
|
|
|
NOTE: for Items inherited from Item_sum, func_name() return part of
|
|
function name till first argument (including '(') to make difference in
|
|
names for functions with 'distinct' clause and without 'distinct' and
|
|
also to make printing of items inherited from Item_sum uniform.
|
|
*/
|
|
// However, we have no option but to use it.
|
|
|
|
const char* f = func_item->func_name();
|
|
|
|
char func_name[strlen(f) + 3 + 1]; // strlen(substring) - strlen(substr) from below.
|
|
strcpy(func_name, f);
|
|
trim(func_name); // Sometimes the embedded parser leaves leading and trailing whitespace.
|
|
|
|
// Non native functions are surrounded by back-ticks, let's remove them.
|
|
remove_surrounding_back_ticks(func_name);
|
|
|
|
char* dot = strchr(func_name, '.');
|
|
|
|
if (dot)
|
|
{
|
|
// If there is a dot in the name we assume we have something like
|
|
// db.fn(). We remove the scope, can't return that in qc_sqlite
|
|
++dot;
|
|
memmove(func_name, dot, strlen(func_name) - (dot - func_name) + 1);
|
|
remove_surrounding_back_ticks(func_name);
|
|
}
|
|
|
|
char* parenthesis = strchr(func_name, '(');
|
|
|
|
if (parenthesis)
|
|
{
|
|
// The func_name of count in "SELECT count(distinct ...)" is
|
|
// "count(distinct", so we need to strip that away.
|
|
*parenthesis = 0;
|
|
}
|
|
|
|
// We want to ignore functions that do not really appear as such in an
|
|
// actual SQL statement. E.g. "SELECT @a" appears as a function "get_user_var".
|
|
if ((strcasecmp(func_name, "decimal_typecast") != 0) &&
|
|
(strcasecmp(func_name, "cast_as_char") != 0) &&
|
|
(strcasecmp(func_name, "cast_as_date") != 0) &&
|
|
(strcasecmp(func_name, "cast_as_datetime") != 0) &&
|
|
(strcasecmp(func_name, "cast_as_time") != 0) &&
|
|
(strcasecmp(func_name, "cast_as_signed") != 0) &&
|
|
(strcasecmp(func_name, "cast_as_unsigned") != 0) &&
|
|
(strcasecmp(func_name, "get_user_var") != 0) &&
|
|
(strcasecmp(func_name, "get_system_var") != 0) &&
|
|
(strcasecmp(func_name, "set_user_var") != 0) &&
|
|
(strcasecmp(func_name, "set_system_var") != 0))
|
|
{
|
|
if (strcmp(func_name, "%") == 0)
|
|
{
|
|
// Embedded library silently changes "mod" into "%". We need to check
|
|
// what it originally was, so that the result agrees with that of
|
|
// qc_sqlite.
|
|
if (func_item->name && (strncasecmp(func_item->name, "mod", 3) == 0))
|
|
{
|
|
strcpy(func_name, "mod");
|
|
}
|
|
}
|
|
else if (strcmp(func_name, "<=>") == 0)
|
|
{
|
|
// qc_sqlite does not distinguish between "<=>" and "=", so we
|
|
// change "<=>" into "=".
|
|
strcpy(func_name, "=");
|
|
}
|
|
else if (strcasecmp(func_name, "substr") == 0)
|
|
{
|
|
// Embedded library silently changes "substring" into "substr". We need
|
|
// to check what it originally was, so that the result agrees with
|
|
// that of qc_sqlite. We reserved space for this above.
|
|
if (func_item->name && (strncasecmp(func_item->name, "substring", 9) == 0))
|
|
{
|
|
strcpy(func_name, "substring");
|
|
}
|
|
}
|
|
else if (strcasecmp(func_name, "add_time") == 0)
|
|
{
|
|
// For whatever reason the name of "addtime" is returned as "add_time".
|
|
strcpy(func_name, "addtime");
|
|
}
|
|
|
|
add_function_info(pi, func_name, usage);
|
|
}
|
|
|
|
for (size_t i = 0; i < n_items; ++i)
|
|
{
|
|
update_field_infos(pi, source, items[i], usage, excludep);
|
|
}
|
|
}
|
|
break;
|
|
|
|
case Item::SUBSELECT_ITEM:
|
|
{
|
|
Item_subselect* subselect_item = static_cast<Item_subselect*>(item);
|
|
|
|
switch (subselect_item->substype())
|
|
{
|
|
case Item_subselect::IN_SUBS:
|
|
add_function_info(pi, "in", usage);
|
|
case Item_subselect::ALL_SUBS:
|
|
case Item_subselect::ANY_SUBS:
|
|
{
|
|
Item_in_subselect* in_subselect_item = static_cast<Item_in_subselect*>(item);
|
|
|
|
#if (((MYSQL_VERSION_MAJOR == 5) &&\
|
|
((MYSQL_VERSION_MINOR > 5) ||\
|
|
((MYSQL_VERSION_MINOR == 5) && (MYSQL_VERSION_PATCH >= 48))\
|
|
)\
|
|
) ||\
|
|
(MYSQL_VERSION_MAJOR >= 10)\
|
|
)
|
|
if (in_subselect_item->left_expr_orig)
|
|
{
|
|
update_field_infos(pi, source,
|
|
in_subselect_item->left_expr_orig, usage, excludep);
|
|
}
|
|
st_select_lex* ssl = in_subselect_item->get_select_lex();
|
|
if (ssl)
|
|
{
|
|
uint32_t sub_usage = usage;
|
|
|
|
sub_usage &= ~QC_USED_IN_SELECT;
|
|
sub_usage |= QC_USED_IN_SUBSELECT;
|
|
|
|
update_field_infos(pi,
|
|
get_lex(pi),
|
|
ssl,
|
|
sub_usage,
|
|
excludep);
|
|
}
|
|
#else
|
|
#pragma message "Figure out what to do with versions < 5.5.48."
|
|
#endif
|
|
// TODO: Anything else that needs to be looked into?
|
|
}
|
|
break;
|
|
|
|
case Item_subselect::EXISTS_SUBS:
|
|
// TODO: Handle these explicitly as well.
|
|
break;
|
|
|
|
case Item_subselect::SINGLEROW_SUBS:
|
|
{
|
|
Item_singlerow_subselect* ss_item = static_cast<Item_singlerow_subselect*>(item);
|
|
st_select_lex *ssl = ss_item->get_select_lex();
|
|
|
|
usage &= ~QC_USED_IN_SELECT;
|
|
usage |= QC_USED_IN_SUBSELECT;
|
|
|
|
update_field_infos(pi, get_lex(pi), ssl, usage, excludep);
|
|
}
|
|
break;
|
|
|
|
case Item_subselect::UNKNOWN_SUBS:
|
|
default:
|
|
MXS_ERROR("Unknown subselect type: %d", subselect_item->substype());
|
|
break;
|
|
}
|
|
}
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void update_field_infos(parsing_info_t* pi,
|
|
LEX* lex,
|
|
st_select_lex* select,
|
|
uint32_t usage,
|
|
List<Item>* excludep)
|
|
{
|
|
List_iterator<Item> ilist(select->item_list);
|
|
|
|
while (Item *item = ilist++)
|
|
{
|
|
update_field_infos(pi, COLLECT_SELECT, item, usage, NULL);
|
|
}
|
|
|
|
if (select->group_list.first)
|
|
{
|
|
ORDER* order = select->group_list.first;
|
|
while (order)
|
|
{
|
|
Item* item = *order->item;
|
|
|
|
update_field_infos(pi, COLLECT_GROUP_BY, item, QC_USED_IN_GROUP_BY,
|
|
&select->item_list);
|
|
|
|
order = order->next;
|
|
}
|
|
}
|
|
|
|
if (select->where)
|
|
{
|
|
update_field_infos(pi, COLLECT_WHERE,
|
|
select->where,
|
|
QC_USED_IN_WHERE,
|
|
&select->item_list);
|
|
}
|
|
|
|
#if defined(COLLECT_HAVING_AS_WELL)
|
|
// A HAVING clause can only refer to fields that already have been
|
|
// mentioned. Consequently, they need not be collected.
|
|
if (select->having)
|
|
{
|
|
update_field_infos(pi, COLLECT_HAVING,
|
|
select->having,
|
|
0,
|
|
&select->item_list);
|
|
}
|
|
#endif
|
|
|
|
TABLE_LIST* table_list = select->get_table_list();
|
|
|
|
if (table_list)
|
|
{
|
|
st_select_lex *sl = table_list->get_single_select();
|
|
|
|
if (sl)
|
|
{
|
|
// This is for "SELECT 1 FROM (SELECT ...)"
|
|
usage &= ~QC_USED_IN_SELECT;
|
|
usage |= QC_USED_IN_SUBSELECT;
|
|
update_field_infos(pi, get_lex(pi), sl, usage, excludep);
|
|
}
|
|
}
|
|
}
|
|
|
|
int32_t qc_mysql_get_field_info(GWBUF* buf, const QC_FIELD_INFO** infos, uint32_t* n_infos)
|
|
{
|
|
if (!buf)
|
|
{
|
|
return QC_RESULT_OK;
|
|
}
|
|
|
|
if (!ensure_query_is_parsed(buf))
|
|
{
|
|
return QC_RESULT_ERROR;;
|
|
}
|
|
|
|
parsing_info_t* pi = get_pinfo(buf);
|
|
ss_dassert(pi);
|
|
|
|
if (!pi->field_infos)
|
|
{
|
|
LEX* lex = get_lex(buf);
|
|
ss_dassert(lex);
|
|
|
|
if (!lex)
|
|
{
|
|
return QC_RESULT_ERROR;
|
|
}
|
|
|
|
uint32_t usage = 0;
|
|
|
|
switch (lex->sql_command)
|
|
{
|
|
case SQLCOM_UPDATE:
|
|
case SQLCOM_UPDATE_MULTI:
|
|
usage |= QC_USED_IN_SET;
|
|
break;
|
|
|
|
default:
|
|
usage |= QC_USED_IN_SELECT;
|
|
}
|
|
|
|
lex->current_select = &lex->select_lex;
|
|
|
|
update_field_infos(pi, lex, &lex->select_lex, usage, NULL);
|
|
|
|
List_iterator<Item> ilist(lex->value_list);
|
|
while (Item* item = ilist++)
|
|
{
|
|
update_field_infos(pi, COLLECT_SELECT, item, 0, NULL);
|
|
}
|
|
|
|
if ((lex->sql_command == SQLCOM_INSERT) ||
|
|
(lex->sql_command == SQLCOM_INSERT_SELECT) ||
|
|
(lex->sql_command == SQLCOM_REPLACE) ||
|
|
(lex->sql_command == SQLCOM_REPLACE_SELECT))
|
|
{
|
|
List_iterator<Item> ilist(lex->field_list);
|
|
while (Item *item = ilist++)
|
|
{
|
|
update_field_infos(pi, COLLECT_SELECT, item, 0, NULL);
|
|
}
|
|
|
|
if (lex->insert_list)
|
|
{
|
|
List_iterator<Item> ilist(*lex->insert_list);
|
|
while (Item *item = ilist++)
|
|
{
|
|
update_field_infos(pi, COLLECT_SELECT, item, 0, NULL);
|
|
}
|
|
}
|
|
}
|
|
|
|
if (lex->sql_command == SQLCOM_SET_OPTION)
|
|
{
|
|
#if defined(WAY_TO_DOWNCAST_SET_VAR_BASE_EXISTS)
|
|
// The list of set_var_base contains the value of variables.
|
|
// However, the actual type is a derived type of set_var_base
|
|
// and there is no information using which we could do the
|
|
// downcast...
|
|
List_iterator<set_var_base> ilist(lex->var_list);
|
|
while (set_var_base* var = ilist++)
|
|
{
|
|
// Is set_var_base a set_var, set_var_user, set_var_password
|
|
// set_var_role
|
|
...
|
|
}
|
|
#endif
|
|
// ...so, we will simply assume that any nested selects are
|
|
// from statements like "set @a:=(SELECT a from t1)".
|
|
|
|
usage &= ~QC_USED_IN_SELECT;
|
|
usage |= QC_USED_IN_SUBSELECT;
|
|
|
|
st_select_lex* select = lex->all_selects_list;
|
|
|
|
while (select)
|
|
{
|
|
if (select->nest_level != 0) // Not the top-level select.
|
|
{
|
|
update_field_infos(pi, lex, select, usage, NULL);
|
|
}
|
|
|
|
select = select->next_select_in_list();
|
|
}
|
|
}
|
|
}
|
|
|
|
*infos = pi->field_infos;
|
|
*n_infos = pi->field_infos_len;
|
|
|
|
return QC_RESULT_OK;
|
|
}
|
|
|
|
int32_t qc_mysql_get_function_info(GWBUF* buf,
|
|
const QC_FUNCTION_INFO** function_infos,
|
|
uint32_t* n_function_infos)
|
|
{
|
|
*function_infos = NULL;
|
|
*n_function_infos = 0;
|
|
|
|
const QC_FIELD_INFO* field_infos;
|
|
uint32_t n_field_infos;
|
|
|
|
// We ensure the information has been collected by querying the fields first.
|
|
qc_mysql_get_field_info(buf, &field_infos, &n_field_infos);
|
|
|
|
parsing_info_t* pi = get_pinfo(buf);
|
|
ss_dassert(pi);
|
|
|
|
*function_infos = pi->function_infos;
|
|
*n_function_infos = pi->function_infos_len;
|
|
|
|
return QC_RESULT_OK;
|
|
}
|
|
|
|
namespace
|
|
{
|
|
|
|
// Do not change the order without making corresponding changes to IDX_... below.
|
|
const char* server_options[] =
|
|
{
|
|
"MariaDB Corporation MaxScale",
|
|
"--no-defaults",
|
|
"--datadir=",
|
|
"--language=",
|
|
"--skip-innodb",
|
|
"--default-storage-engine=myisam",
|
|
NULL
|
|
};
|
|
|
|
const int IDX_DATADIR = 2;
|
|
const int IDX_LANGUAGE = 3;
|
|
const int N_OPTIONS = (sizeof(server_options) / sizeof(server_options[0])) - 1;
|
|
|
|
const char* server_groups[] =
|
|
{
|
|
"embedded",
|
|
"server",
|
|
"server",
|
|
"embedded",
|
|
"server",
|
|
"server",
|
|
NULL
|
|
};
|
|
|
|
const int OPTIONS_DATADIR_SIZE = 10 + PATH_MAX; // strlen("--datadir=");
|
|
const int OPTIONS_LANGUAGE_SIZE = 11 + PATH_MAX; // strlen("--language=");
|
|
|
|
char datadir_arg[OPTIONS_DATADIR_SIZE];
|
|
char language_arg[OPTIONS_LANGUAGE_SIZE];
|
|
|
|
|
|
void configure_options(const char* datadir, const char* langdir)
|
|
{
|
|
int rv;
|
|
|
|
rv = snprintf(datadir_arg, OPTIONS_DATADIR_SIZE, "--datadir=%s", datadir);
|
|
ss_dassert(rv < OPTIONS_DATADIR_SIZE); // Ensured by create_datadir().
|
|
server_options[IDX_DATADIR] = datadir_arg;
|
|
|
|
rv = sprintf(language_arg, "--language=%s", langdir);
|
|
ss_dassert(rv < OPTIONS_LANGUAGE_SIZE); // Ensured by qc_process_init().
|
|
server_options[IDX_LANGUAGE] = language_arg;
|
|
|
|
// To prevent warning of unused variable when built in release mode,
|
|
// when ss_dassert() turns into empty statement.
|
|
(void)rv;
|
|
}
|
|
|
|
}
|
|
|
|
int32_t qc_mysql_setup(const char* args)
|
|
{
|
|
if (args)
|
|
{
|
|
MXS_WARNING("'%s' provided as arguments, "
|
|
"even though no arguments are supported.", args);
|
|
}
|
|
|
|
return QC_RESULT_OK;
|
|
}
|
|
|
|
int32_t qc_mysql_process_init(void)
|
|
{
|
|
bool inited = false;
|
|
|
|
if (strlen(get_langdir()) >= PATH_MAX)
|
|
{
|
|
fprintf(stderr, "MaxScale: error: Language path is too long: %s.", get_langdir());
|
|
}
|
|
else
|
|
{
|
|
configure_options(get_process_datadir(), get_langdir());
|
|
|
|
int argc = N_OPTIONS;
|
|
char** argv = const_cast<char**>(server_options);
|
|
char** groups = const_cast<char**>(server_groups);
|
|
|
|
int rc = mysql_library_init(argc, argv, groups);
|
|
|
|
if (rc != 0)
|
|
{
|
|
MXS_ERROR("mysql_library_init() failed. Error code: %d", rc);
|
|
}
|
|
else
|
|
{
|
|
#if MYSQL_VERSION_ID >= 100000
|
|
set_malloc_size_cb(NULL);
|
|
#endif
|
|
MXS_NOTICE("Query classifier initialized.");
|
|
inited = true;
|
|
}
|
|
}
|
|
|
|
return inited ? QC_RESULT_OK : QC_RESULT_ERROR;
|
|
}
|
|
|
|
void qc_mysql_process_end(void)
|
|
{
|
|
mysql_library_end();
|
|
}
|
|
|
|
int32_t qc_mysql_thread_init(void)
|
|
{
|
|
bool inited = (mysql_thread_init() == 0);
|
|
|
|
if (!inited)
|
|
{
|
|
MXS_ERROR("mysql_thread_init() failed.");
|
|
}
|
|
|
|
return inited ? QC_RESULT_OK : QC_RESULT_ERROR;
|
|
}
|
|
|
|
void qc_mysql_thread_end(void)
|
|
{
|
|
mysql_thread_end();
|
|
}
|
|
|
|
/**
|
|
* EXPORTS
|
|
*/
|
|
|
|
extern "C"
|
|
{
|
|
|
|
MXS_MODULE* MXS_CREATE_MODULE()
|
|
{
|
|
static QUERY_CLASSIFIER qc =
|
|
{
|
|
qc_mysql_setup,
|
|
qc_mysql_process_init,
|
|
qc_mysql_process_end,
|
|
qc_mysql_thread_init,
|
|
qc_mysql_thread_end,
|
|
qc_mysql_parse,
|
|
qc_mysql_get_type_mask,
|
|
qc_mysql_get_operation,
|
|
qc_mysql_get_created_table_name,
|
|
qc_mysql_is_drop_table_query,
|
|
qc_mysql_get_table_names,
|
|
NULL,
|
|
qc_mysql_query_has_clause,
|
|
qc_mysql_get_database_names,
|
|
qc_mysql_get_prepare_name,
|
|
qc_mysql_get_field_info,
|
|
qc_mysql_get_function_info,
|
|
qc_mysql_get_preparable_stmt,
|
|
};
|
|
|
|
static MXS_MODULE info =
|
|
{
|
|
MXS_MODULE_API_QUERY_CLASSIFIER,
|
|
MXS_MODULE_IN_DEVELOPMENT,
|
|
QUERY_CLASSIFIER_VERSION,
|
|
"Query classifier based upon MySQL Embedded",
|
|
"V1.0.0",
|
|
&qc,
|
|
qc_mysql_process_init,
|
|
qc_mysql_process_end,
|
|
qc_mysql_thread_init,
|
|
qc_mysql_thread_end,
|
|
{
|
|
{MXS_END_MODULE_PARAMS}
|
|
}
|
|
};
|
|
|
|
return &info;
|
|
}
|
|
|
|
}
|