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mariadb/sql/events.cc
andrey@lmy004. 3b840adee7 WL#3337 (Event scheduler new architecture) 
Cleaned up the code a bit. Fixed few leaks.
This code still does not load events on server startup
from disk. The problem is that there is a need for a THD instance, which
does not exist during server boot. This will be solved soon.
Still Event_timed is used both for the memory queue and for exectution.
This will be changed according to WL#3337 probably in the next commit.
2006-07-05 17:12:50 +02:00

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/* Copyright (C) 2004-2006 MySQL AB
This program 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; either version 2 of the License, or
(at your option) any later version.
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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
#include "mysql_priv.h"
#include "events.h"
#include "event_data_objects.h"
#include "event_db_repository.h"
#include "event_queue.h"
#include "event_scheduler_ng.h"
#include "sp_head.h"
/*
TODO list :
- CREATE EVENT should not go into binary log! Does it now? The SQL statements
issued by the EVENT are replicated.
I have an idea how to solve the problem at failover. So the status field
will be ENUM('DISABLED', 'ENABLED', 'SLAVESIDE_DISABLED').
In this case when CREATE EVENT is replicated it should go into the binary
as SLAVESIDE_DISABLED if it is ENABLED, when it's created as DISABLEd it
should be replicated as disabled. If an event is ALTERed as DISABLED the
query should go untouched into the binary log, when ALTERed as enable then
it should go as SLAVESIDE_DISABLED. This is regarding the SQL interface.
TT routines however modify mysql.event internally and this does not go the
log so in this case queries has to be injected into the log...somehow... or
maybe a solution is RBR for this case, because the event may go only from
ENABLED to DISABLED status change and this is safe for replicating. As well
an event may be deleted which is also safe for RBR.
- Add logging to file
Warning:
- For now parallel execution is not possible because the same sp_head cannot
be executed few times!!! There is still no lock attached to particular
event.
*/
/*
If the user (un)intentionally removes an event directly from mysql.event
the following sequence has to be used to be able to remove the in-memory
counterpart.
1. CREATE EVENT the_name ON SCHEDULE EVERY 1 SECOND DISABLE DO SELECT 1;
2. DROP EVENT the_name
In other words, the first one will create a row in mysql.event . In the
second step because there will be a line, disk based drop will pass and
the scheduler will remove the memory counterpart. The reason is that
in-memory queue does not check whether the event we try to drop from memory
is disabled. Disabled events are not kept in-memory because they are not
eligible for execution.
*/
const char *event_scheduler_state_names[]=
{ "OFF", "0", "ON", "1", "SUSPEND", "2", NullS };
TYPELIB Events::opt_typelib=
{
array_elements(event_scheduler_state_names)-1,
"",
event_scheduler_state_names,
NULL
};
Events Events::singleton;
ulong Events::opt_event_scheduler= 2;
/*
Compares 2 LEX strings regarding case.
SYNOPSIS
sortcmp_lex_string()
s - first LEX_STRING
t - second LEX_STRING
cs - charset
RETURN VALUE
-1 - s < t
0 - s == t
1 - s > t
Notes
TIME.second_part is not considered during comparison
*/
int sortcmp_lex_string(LEX_STRING s, LEX_STRING t, CHARSET_INFO *cs)
{
return cs->coll->strnncollsp(cs, (uchar *) s.str,s.length,
(uchar *) t.str,t.length, 0);
}
/*
Accessor for the singleton instance.
SYNOPSIS
Events::get_instance()
RETURN VALUE
address
*/
Events *
Events::get_instance()
{
DBUG_ENTER("Events::get_instance");
DBUG_RETURN(&singleton);
}
/*
Reconstructs interval expression from interval type and expression
value that is in form of a value of the smalles entity:
For
YEAR_MONTH - expression is in months
DAY_MINUTE - expression is in minutes
SYNOPSIS
Events::reconstruct_interval_expression()
buf - preallocated String buffer to add the value to
interval - the interval type (for instance YEAR_MONTH)
expression - the value in the lowest entity
RETURN VALUE
0 - OK
1 - Error
*/
int
Events::reconstruct_interval_expression(String *buf, interval_type interval,
longlong expression)
{
ulonglong expr= expression;
char tmp_buff[128], *end;
bool close_quote= TRUE;
int multipl= 0;
char separator=':';
switch (interval) {
case INTERVAL_YEAR_MONTH:
multipl= 12;
separator= '-';
goto common_1_lev_code;
case INTERVAL_DAY_HOUR:
multipl= 24;
separator= ' ';
goto common_1_lev_code;
case INTERVAL_HOUR_MINUTE:
case INTERVAL_MINUTE_SECOND:
multipl= 60;
common_1_lev_code:
buf->append('\'');
end= longlong10_to_str(expression/multipl, tmp_buff, 10);
buf->append(tmp_buff, (uint) (end- tmp_buff));
expr= expr - (expr/multipl)*multipl;
break;
case INTERVAL_DAY_MINUTE:
{
ulonglong tmp_expr= expr;
tmp_expr/=(24*60);
buf->append('\'');
end= longlong10_to_str(tmp_expr, tmp_buff, 10);
buf->append(tmp_buff, (uint) (end- tmp_buff));// days
buf->append(' ');
tmp_expr= expr - tmp_expr*(24*60);//minutes left
end= longlong10_to_str(tmp_expr/60, tmp_buff, 10);
buf->append(tmp_buff, (uint) (end- tmp_buff));// hours
expr= tmp_expr - (tmp_expr/60)*60;
/* the code after the switch will finish */
}
break;
case INTERVAL_HOUR_SECOND:
{
ulonglong tmp_expr= expr;
buf->append('\'');
end= longlong10_to_str(tmp_expr/3600, tmp_buff, 10);
buf->append(tmp_buff, (uint) (end- tmp_buff));// hours
buf->append(':');
tmp_expr= tmp_expr - (tmp_expr/3600)*3600;
end= longlong10_to_str(tmp_expr/60, tmp_buff, 10);
buf->append(tmp_buff, (uint) (end- tmp_buff));// minutes
expr= tmp_expr - (tmp_expr/60)*60;
/* the code after the switch will finish */
}
break;
case INTERVAL_DAY_SECOND:
{
ulonglong tmp_expr= expr;
tmp_expr/=(24*3600);
buf->append('\'');
end= longlong10_to_str(tmp_expr, tmp_buff, 10);
buf->append(tmp_buff, (uint) (end- tmp_buff));// days
buf->append(' ');
tmp_expr= expr - tmp_expr*(24*3600);//seconds left
end= longlong10_to_str(tmp_expr/3600, tmp_buff, 10);
buf->append(tmp_buff, (uint) (end- tmp_buff));// hours
buf->append(':');
tmp_expr= tmp_expr - (tmp_expr/3600)*3600;
end= longlong10_to_str(tmp_expr/60, tmp_buff, 10);
buf->append(tmp_buff, (uint) (end- tmp_buff));// minutes
expr= tmp_expr - (tmp_expr/60)*60;
/* the code after the switch will finish */
}
break;
case INTERVAL_DAY_MICROSECOND:
case INTERVAL_HOUR_MICROSECOND:
case INTERVAL_MINUTE_MICROSECOND:
case INTERVAL_SECOND_MICROSECOND:
case INTERVAL_MICROSECOND:
my_error(ER_NOT_SUPPORTED_YET, MYF(0), "MICROSECOND");
return 1;
break;
case INTERVAL_QUARTER:
expr/= 3;
close_quote= FALSE;
break;
case INTERVAL_WEEK:
expr/= 7;
default:
close_quote= FALSE;
break;
}
if (close_quote)
buf->append(separator);
end= longlong10_to_str(expr, tmp_buff, 10);
buf->append(tmp_buff, (uint) (end- tmp_buff));
if (close_quote)
buf->append('\'');
return 0;
}
/*
Open mysql.event table for read
SYNOPSIS
Events::open_event_table()
thd Thread context
lock_type How to lock the table
table We will store the open table here
RETURN VALUE
1 Cannot lock table
2 The table is corrupted - different number of fields
0 OK
*/
int
Events::open_event_table(THD *thd, enum thr_lock_type lock_type,
TABLE **table)
{
return db_repository->open_event_table(thd, lock_type, table);
}
/*
The function exported to the world for creating of events.
SYNOPSIS
Events::create_event()
thd THD
et event's data
create_options Options specified when in the query. We are
interested whether there is IF NOT EXISTS
rows_affected How many rows were affected
RETURN VALUE
0 OK
!0 Error
NOTES
- in case there is an event with the same name (db) and
IF NOT EXISTS is specified, an warning is put into the W stack.
*/
int
Events::create_event(THD *thd, Event_parse_data *parse_data, bool if_not_exists,
uint *rows_affected)
{
int ret;
DBUG_ENTER("Events::create_event");
if (!(ret= db_repository->create_event(thd, parse_data, if_not_exists,
rows_affected)))
{
if ((ret= event_queue->create_event(thd, parse_data)))
my_error(ER_EVENT_MODIFY_QUEUE_ERROR, MYF(0), ret);
}
/* No need to close the table, it will be closed in sql_parse::do_command */
DBUG_RETURN(ret);
}
/*
The function exported to the world for alteration of events.
SYNOPSIS
Events::update_event()
thd THD
et event's data
new_name set in case of RENAME TO.
RETURN VALUE
0 OK
!0 Error
NOTES
et contains data about dbname and event name.
new_name is the new name of the event, if not null (this means
that RENAME TO was specified in the query)
*/
int
Events::update_event(THD *thd, Event_parse_data *parse_data, sp_name *new_name,
uint *rows_affected)
{
int ret;
DBUG_ENTER("Events::update_event");
/*
db_update_event() opens & closes the table to prevent
crash later in the code when loading and compiling the new definition.
Also on error conditions my_error() is called so no need to handle here
*/
if (!(ret= db_repository->update_event(thd, parse_data, new_name)))
{
if ((ret= event_queue->update_event(thd, parse_data,
new_name? &new_name->m_db: NULL,
new_name? &new_name->m_name: NULL)))
my_error(ER_EVENT_MODIFY_QUEUE_ERROR, MYF(0), ret);
}
DBUG_RETURN(ret);
}
/*
Drops an event
SYNOPSIS
Events::drop_event()
thd THD
name Event's name
if_exists When set and the event does not exist => warning onto
the stack
rows_affected Affected number of rows is returned heres
RETURN VALUE
0 OK
!0 Error (reported)
*/
int
Events::drop_event(THD *thd, sp_name *name, bool if_exists, uint *rows_affected)
{
int ret;
DBUG_ENTER("Events::drop_event");
if (!(ret= db_repository->drop_event(thd, name->m_db, name->m_name, if_exists,
rows_affected)))
{
if ((ret= event_queue->drop_event(thd, name)))
my_error(ER_EVENT_MODIFY_QUEUE_ERROR, MYF(0), ret);
}
DBUG_RETURN(ret);
}
/*
SHOW CREATE EVENT
SYNOPSIS
Events::show_create_event()
thd THD
spn the name of the event (db, name)
RETURN VALUE
0 OK
1 Error during writing to the wire
*/
int
Events::show_create_event(THD *thd, sp_name *spn)
{
int ret;
Event_timed *et= NULL;
Open_tables_state backup;
DBUG_ENTER("Events::show_create_event");
DBUG_PRINT("enter", ("name: %*s", spn->m_name.length, spn->m_name.str));
thd->reset_n_backup_open_tables_state(&backup);
ret= db_repository->find_event(thd, spn->m_db, spn->m_name, &et, NULL);
thd->restore_backup_open_tables_state(&backup);
if (!ret)
{
Protocol *protocol= thd->protocol;
char show_str_buf[768];
String show_str(show_str_buf, sizeof(show_str_buf), system_charset_info);
List<Item> field_list;
byte *sql_mode_str;
ulong sql_mode_len=0;
show_str.length(0);
show_str.set_charset(system_charset_info);
if (et->get_create_event(thd, &show_str))
goto err;
field_list.push_back(new Item_empty_string("Event", NAME_LEN));
sql_mode_str=
sys_var_thd_sql_mode::symbolic_mode_representation(thd, et->sql_mode,
&sql_mode_len);
field_list.push_back(new Item_empty_string("sql_mode", sql_mode_len));
field_list.push_back(new Item_empty_string("Create Event",
show_str.length()));
if (protocol->send_fields(&field_list, Protocol::SEND_NUM_ROWS |
Protocol::SEND_EOF))
goto err;
protocol->prepare_for_resend();
protocol->store(et->name.str, et->name.length, system_charset_info);
protocol->store((char*) sql_mode_str, sql_mode_len, system_charset_info);
protocol->store(show_str.c_ptr(), show_str.length(), system_charset_info);
ret= protocol->write();
send_eof(thd);
}
delete et;
DBUG_RETURN(ret);
err:
delete et;
DBUG_RETURN(1);
}
/*
Drops all events from a schema
SYNOPSIS
Events::drop_schema_events()
thd Thread
db ASCIIZ schema name
RETURN VALUE
0 OK
!0 Error
*/
int
Events::drop_schema_events(THD *thd, char *db)
{
int ret= 0;
LEX_STRING db_lex= {db, strlen(db)};
DBUG_ENTER("evex_drop_db_events");
DBUG_PRINT("enter", ("dropping events from %s", db));
event_queue->drop_schema_events(thd, db_lex);
ret= db_repository->drop_schema_events(thd, db_lex);
DBUG_RETURN(ret);
}
/*
Inits the scheduler's structures.
SYNOPSIS
Events::init()
NOTES
This function is not synchronized.
RETURN VALUE
0 OK
1 Error
*/
int
Events::init()
{
int ret= 0;
Event_db_repository *db_repo;
DBUG_ENTER("Events::init");
db_repository->init_repository();
event_queue->init_queue(db_repository, scheduler_ng);
scheduler_ng->init_scheduler(event_queue);
/* it should be an assignment! */
if (opt_event_scheduler)
{
DBUG_ASSERT(opt_event_scheduler == 1 || opt_event_scheduler == 2);
if (opt_event_scheduler == 1)
DBUG_RETURN(scheduler_ng->start());
}
DBUG_RETURN(0);
}
/*
Cleans up scheduler's resources. Called at server shutdown.
SYNOPSIS
Events::deinit()
NOTES
This function is not synchronized.
*/
void
Events::deinit()
{
DBUG_ENTER("Events::deinit");
scheduler_ng->stop();
scheduler_ng->deinit_scheduler();
event_queue->deinit_queue();
db_repository->deinit_repository();
DBUG_VOID_RETURN;
}
/*
Inits Events mutexes
SYNOPSIS
Events::init_mutexes()
thd Thread
*/
void
Events::init_mutexes()
{
db_repository= new Event_db_repository;
event_queue= new Event_queue;
event_queue->init_mutexes();
scheduler_ng= new Event_scheduler_ng();
scheduler_ng->init_mutexes();
}
/*
Destroys Events mutexes
SYNOPSIS
Events::destroy_mutexes()
*/
void
Events::destroy_mutexes()
{
event_queue->deinit_mutexes();
scheduler_ng->deinit_mutexes();
delete scheduler_ng;
delete db_repository;
}
/*
Proxy for Event_scheduler::dump_internal_status
SYNOPSIS
Events::dump_internal_status()
thd Thread
RETURN VALUE
0 OK
!0 Error
*/
int
Events::dump_internal_status(THD *thd)
{
return Event_scheduler_ng::dump_internal_status(thd);
}
/*
Proxy for Event_db_repository::fill_schema_events.
Callback for I_S from sql_show.cc
SYNOPSIS
Events::fill_schema_events()
thd Thread
tables The schema table
cond Unused
RETURN VALUE
0 OK
!0 Error
*/
int
Events::fill_schema_events(THD *thd, TABLE_LIST *tables, COND * /* cond */)
{
char *db= NULL;
DBUG_ENTER("Events::fill_schema_events");
/*
If it's SHOW EVENTS then thd->lex->select_lex.db is guaranteed not to
be NULL. Let's do an assert anyway.
*/
if (thd->lex->sql_command == SQLCOM_SHOW_EVENTS)
{
DBUG_ASSERT(thd->lex->select_lex.db);
if (check_access(thd, EVENT_ACL, thd->lex->select_lex.db, 0, 0, 0,
is_schema_db(thd->lex->select_lex.db)))
DBUG_RETURN(1);
db= thd->lex->select_lex.db;
}
DBUG_RETURN(get_instance()->db_repository->fill_schema_events(thd, tables, db));
}
bool
Events::start_execution_of_events()
{
DBUG_ENTER("Events::start_execution_of_events");
DBUG_RETURN(scheduler_ng->start());
}
bool
Events::stop_execution_of_events()
{
DBUG_ENTER("Events::stop_execution_of_events");
DBUG_RETURN(scheduler_ng->stop());
}
bool
Events::is_started()
{
DBUG_ENTER("Events::is_started");
DBUG_RETURN(scheduler_ng->get_state() == Event_scheduler_ng::RUNNING);
}
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