mariadb/plugin/qc_info/qc_info.cc

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/*
Copyright (c) 2008, Roland Bouman
http://rpbouman.blogspot.com/
roland.bouman@gmail.com
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
* Neither the name of the Roland Bouman nor the
names of the contributors may be used to endorse or promote products
derived from this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef MYSQL_SERVER
#define MYSQL_SERVER
#endif
#include <my_global.h>
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#include <sql_parse.h> // check_global_access
#include <sql_acl.h> // PROCESS_ACL
#include <sql_class.h> // THD
#include <sql_cache.h>
#include <sql_i_s.h> // ST_SCHEMA_TABLE
#include <set_var.h> // sql_mode_string_representation
#include <tztime.h>
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#include <mysql/plugin.h>
class Accessible_Query_Cache : public Query_cache {
public:
HASH *get_queries()
{
return &this->queries;
}
} *qc;
bool schema_table_store_record(THD *thd, TABLE *table);
#define MAX_STATEMENT_TEXT_LENGTH 32767
#define COLUMN_STATEMENT_SCHEMA 0
#define COLUMN_STATEMENT_TEXT 1
#define COLUMN_RESULT_BLOCKS_COUNT 2
#define COLUMN_RESULT_BLOCKS_SIZE 3
#define COLUMN_RESULT_BLOCKS_SIZE_USED 4
#define COLUMN_LIMIT 5
#define COLUMN_MAX_SORT_LENGTH 6
#define COLUMN_GROUP_CONCAT_MAX_LENGTH 7
#define COLUMN_CHARACTER_SET_CLIENT 8
#define COLUMN_CHARACTER_SET_RESULT 9
#define COLUMN_COLLATION 10
#define COLUMN_TIMEZONE 11
#define COLUMN_DEFAULT_WEEK_FORMAT 12
#define COLUMN_DIV_PRECISION_INCREMENT 13
#define COLUMN_SQL_MODE 14
#define COLUMN_LC_TIME_NAMES 15
#define COLUMN_CLIENT_LONG_FLAG 16
#define COLUMN_CLIENT_PROTOCOL_41 17
#define COLUMN_PROTOCOL_TYPE 18
#define COLUMN_MORE_RESULTS_EXISTS 19
#define COLUMN_IN_TRANS 20
#define COLUMN_AUTOCOMMIT 21
#define COLUMN_PKT_NR 22
#define COLUMN_HITS 23
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namespace Show {
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/* ST_FIELD_INFO is defined in table.h */
static ST_FIELD_INFO qc_info_fields[]=
{
Column("STATEMENT_SCHEMA", Varchar(NAME_LEN), NOT_NULL),
Column("STATEMENT_TEXT", Longtext(MAX_STATEMENT_TEXT_LENGTH),NOT_NULL),
Column("RESULT_BLOCKS_COUNT", SLong(), NOT_NULL),
Column("RESULT_BLOCKS_SIZE", SLonglong(MY_INT32_NUM_DECIMAL_DIGITS),NOT_NULL),
Column("RESULT_BLOCKS_SIZE_USED",SLonglong(MY_INT32_NUM_DECIMAL_DIGITS), NOT_NULL),
Column("LIMIT", SLonglong(MY_INT32_NUM_DECIMAL_DIGITS), NOT_NULL),
Column("MAX_SORT_LENGTH", SLonglong(MY_INT32_NUM_DECIMAL_DIGITS), NOT_NULL),
Column("GROUP_CONCAT_MAX_LENGTH",SLonglong(MY_INT32_NUM_DECIMAL_DIGITS), NOT_NULL),
Column("CHARACTER_SET_CLIENT", CSName(), NOT_NULL),
Column("CHARACTER_SET_RESULT", CSName(), NOT_NULL),
Column("COLLATION", CSName(), NOT_NULL),
Column("TIMEZONE", Varchar(50), NOT_NULL),
Column("DEFAULT_WEEK_FORMAT", SLong(), NOT_NULL),
Column("DIV_PRECISION_INCREMENT",SLong(), NOT_NULL),
Column("SQL_MODE", Varchar(250), NOT_NULL),
Column("LC_TIME_NAMES", Varchar(100), NOT_NULL),
Column("CLIENT_LONG_FLAG", STiny(MY_INT32_NUM_DECIMAL_DIGITS), NOT_NULL),
Column("CLIENT_PROTOCOL_41", STiny(MY_INT32_NUM_DECIMAL_DIGITS), NOT_NULL),
Column("PROTOCOL_TYPE", STiny(MY_INT32_NUM_DECIMAL_DIGITS), NOT_NULL),
Column("MORE_RESULTS_EXISTS", STiny(MY_INT32_NUM_DECIMAL_DIGITS), NOT_NULL),
Column("IN_TRANS", STiny(MY_INT32_NUM_DECIMAL_DIGITS), NOT_NULL),
Column("AUTOCOMMIT", STiny(MY_INT32_NUM_DECIMAL_DIGITS), NOT_NULL),
Column("PACKET_NUMBER", STiny(MY_INT32_NUM_DECIMAL_DIGITS), NOT_NULL),
Column("HITS", SLonglong(MY_INT32_NUM_DECIMAL_DIGITS), NOT_NULL),
CEnd()
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};
} // namespace Show
static const char unknown[]= "#UNKNOWN#";
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static int qc_info_fill_table(THD *thd, TABLE_LIST *tables,
COND *cond)
{
int status= 1;
CHARSET_INFO *scs= system_charset_info;
TABLE *table= tables->table;
HASH *queries = qc->get_queries();
/* one must have PROCESS privilege to see others' queries */
if (check_global_access(thd, PROCESS_ACL, true))
return 0;
if (qc->try_lock(thd))
return 0; // QC is or is being disabled
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/* loop through all queries in the query cache */
for (uint i= 0; i < queries->records; i++)
{
const uchar *query_cache_block_raw;
Query_cache_block* query_cache_block;
Query_cache_query* query_cache_query;
Query_cache_query_flags flags;
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uint result_blocks_count;
ulonglong result_blocks_size;
ulonglong result_blocks_size_used;
Query_cache_block *first_result_block;
Query_cache_block *result_block;
const char *statement_text;
size_t statement_text_length;
size_t flags_length;
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const char *key, *db;
size_t key_length, db_length;
Changing field::field_name and Item::name to LEX_CSTRING Benefits of this patch: - Removed a lot of calls to strlen(), especially for field_string - Strings generated by parser are now const strings, less chance of accidently changing a string - Removed a lot of calls with LEX_STRING as parameter (changed to pointer) - More uniform code - Item::name_length was not kept up to date. Now fixed - Several bugs found and fixed (Access to null pointers, access of freed memory, wrong arguments to printf like functions) - Removed a lot of casts from (const char*) to (char*) Changes: - This caused some ABI changes - lex_string_set now uses LEX_CSTRING - Some fucntions are now taking const char* instead of char* - Create_field::change and after changed to LEX_CSTRING - handler::connect_string, comment and engine_name() changed to LEX_CSTRING - Checked printf() related calls to find bugs. Found and fixed several errors in old code. - A lot of changes from LEX_STRING to LEX_CSTRING, especially related to parsing and events. - Some changes from LEX_STRING and LEX_STRING & to LEX_CSTRING* - Some changes for char* to const char* - Added printf argument checking for my_snprintf() - Introduced null_clex_str, star_clex_string, temp_lex_str to simplify code - Added item_empty_name and item_used_name to be able to distingush between items that was given an empty name and items that was not given a name This is used in sql_yacc.yy to know when to give an item a name. - select table_name."*' is not anymore same as table_name.* - removed not used function Item::rename() - Added comparision of item->name_length before some calls to my_strcasecmp() to speed up comparison - Moved Item_sp_variable::make_field() from item.h to item.cc - Some minimal code changes to avoid copying to const char * - Fixed wrong error message in wsrep_mysql_parse() - Fixed wrong code in find_field_in_natural_join() where real_item() was set when it shouldn't - ER_ERROR_ON_RENAME was used with extra arguments. - Removed some (wrong) ER_OUTOFMEMORY, as alloc_root will already give the error. TODO: - Check possible unsafe casts in plugin/auth_examples/qa_auth_interface.c - Change code to not modify LEX_CSTRING for database name (as part of lower_case_table_names)
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LEX_CSTRING sql_mode_str;
const String *tz;
CHARSET_INFO *cs_client;
CHARSET_INFO *cs_result;
CHARSET_INFO *collation;
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query_cache_block_raw = my_hash_element(queries, i);
query_cache_block = (Query_cache_block*)query_cache_block_raw;
if (unlikely(!query_cache_block ||
query_cache_block->type != Query_cache_block::QUERY))
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continue;
query_cache_query = query_cache_block->query();
/* Get the actual SQL statement for this query cache query */
statement_text = (const char*)query_cache_query->query();
statement_text_length = strlen(statement_text);
/* We truncate SQL statements up to MAX_STATEMENT_TEXT_LENGTH in our I_S table */
table->field[COLUMN_STATEMENT_TEXT]->store((char*)statement_text,
MY_MIN(statement_text_length, MAX_STATEMENT_TEXT_LENGTH), scs);
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/* get the entire key that identifies this query cache query */
key = (const char*)query_cache_query_get_key(query_cache_block_raw,
&key_length, 0);
/* get and store the flags */
flags_length= key_length - QUERY_CACHE_FLAGS_SIZE;
memcpy(&flags, key+flags_length, QUERY_CACHE_FLAGS_SIZE);
table->field[COLUMN_LIMIT]->store(flags.limit, 0);
table->field[COLUMN_MAX_SORT_LENGTH]->store(flags.max_sort_length, 0);
table->field[COLUMN_GROUP_CONCAT_MAX_LENGTH]->store(flags.group_concat_max_len, 0);
cs_client= get_charset(flags.character_set_client_num, MYF(MY_WME));
if (likely(cs_client))
table->field[COLUMN_CHARACTER_SET_CLIENT]->
store(cs_client->csname, strlen(cs_client->csname), scs);
else
table->field[COLUMN_CHARACTER_SET_CLIENT]->
store(STRING_WITH_LEN(unknown), scs);
cs_result= get_charset(flags.character_set_results_num, MYF(MY_WME));
if (likely(cs_result))
table->field[COLUMN_CHARACTER_SET_RESULT]->
store(cs_result->csname, strlen(cs_result->csname), scs);
else
table->field[COLUMN_CHARACTER_SET_RESULT]->
store(STRING_WITH_LEN(unknown), scs);
collation= get_charset(flags.collation_connection_num, MYF(MY_WME));
if (likely(collation))
table->field[COLUMN_COLLATION]->
store(collation->name, strlen(collation->name), scs);
else
table->field[COLUMN_COLLATION]-> store(STRING_WITH_LEN(unknown), scs);
tz= flags.time_zone->get_name();
if (likely(tz))
table->field[COLUMN_TIMEZONE]->store(tz->ptr(), tz->length(), scs);
else
table->field[COLUMN_TIMEZONE]-> store(STRING_WITH_LEN(unknown), scs);
table->field[COLUMN_DEFAULT_WEEK_FORMAT]->store(flags.default_week_format, 0);
table->field[COLUMN_DIV_PRECISION_INCREMENT]->store(flags.div_precision_increment, 0);
sql_mode_string_representation(thd, flags.sql_mode, &sql_mode_str);
table->field[COLUMN_SQL_MODE]->store(sql_mode_str.str, sql_mode_str.length, scs);
table->field[COLUMN_LC_TIME_NAMES]->store(flags.lc_time_names->name,strlen(flags.lc_time_names->name), scs);
table->field[COLUMN_CLIENT_LONG_FLAG]->store(flags.client_long_flag, 0);
table->field[COLUMN_CLIENT_PROTOCOL_41]->store(flags.client_protocol_41, 0);
table->field[COLUMN_PROTOCOL_TYPE]->store(flags.protocol_type, 0);
table->field[COLUMN_MORE_RESULTS_EXISTS]->store(flags.more_results_exists, 0);
table->field[COLUMN_IN_TRANS]->store(flags.in_trans, 0);
table->field[COLUMN_AUTOCOMMIT]->store(flags.autocommit, 0);
table->field[COLUMN_PKT_NR]->store(flags.pkt_nr, 0);
table->field[COLUMN_HITS]->store(query_cache_query->hits(), 0);
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/* The database against which the statement is executed is part of the
query cache query key
*/
compile_time_assert(QUERY_CACHE_DB_LENGTH_SIZE == 2);
db= key + statement_text_length + 1 + QUERY_CACHE_DB_LENGTH_SIZE;
db_length= uint2korr(db - QUERY_CACHE_DB_LENGTH_SIZE);
table->field[COLUMN_STATEMENT_SCHEMA]->store(db, db_length, scs);
/* If we have result blocks, process them */
first_result_block= query_cache_query->result();
if(query_cache_query->is_results_ready() &&
first_result_block)
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{
/* initialize so we can loop over the result blocks*/
result_block= first_result_block;
result_blocks_count = 1;
result_blocks_size = result_block->length;
result_blocks_size_used = result_block->used;
/* loop over the result blocks*/
while((result_block= result_block->next)!=first_result_block)
{
/* calculate total number of result blocks */
result_blocks_count++;
/* calculate total size of result blocks */
result_blocks_size += result_block->length;
/* calculate total of used size of result blocks */
result_blocks_size_used += result_block->used;
}
}
else
{
result_blocks_count = 0;
result_blocks_size = 0;
result_blocks_size_used = 0;
}
table->field[COLUMN_RESULT_BLOCKS_COUNT]->store(result_blocks_count, 0);
table->field[COLUMN_RESULT_BLOCKS_SIZE]->store(result_blocks_size, 0);
table->field[COLUMN_RESULT_BLOCKS_SIZE_USED]->
store(result_blocks_size_used, 0);
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if (schema_table_store_record(thd, table))
goto cleanup;
}
status = 0;
cleanup:
qc->unlock();
return status;
}
static int qc_info_plugin_init(void *p)
{
ST_SCHEMA_TABLE *schema= (ST_SCHEMA_TABLE *)p;
schema->fields_info= Show::qc_info_fields;
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schema->fill_table= qc_info_fill_table;
qc = (Accessible_Query_Cache *)&query_cache;
return qc == 0;
}
static struct st_mysql_information_schema qc_info_plugin=
{ MYSQL_INFORMATION_SCHEMA_INTERFACE_VERSION };
/*
Plugin library descriptor
*/
maria_declare_plugin(query_cache_info)
{
MYSQL_INFORMATION_SCHEMA_PLUGIN,
&qc_info_plugin,
"QUERY_CACHE_INFO",
"Roland Bouman, Daniel Black",
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"Lists all queries in the query cache.",
PLUGIN_LICENSE_BSD,
qc_info_plugin_init, /* Plugin Init */
0, /* Plugin Deinit */
0x0101, /* version, hex */
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NULL, /* status variables */
NULL, /* system variables */
"1.1", /* version as a string */
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MariaDB_PLUGIN_MATURITY_STABLE
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}
maria_declare_plugin_end;