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mariadb/sql/events.cc
unknown 086fba7627 BUG#16420: Events: timestamps become UTC 
BUG#26429: SHOW CREATE EVENT is incorrect for an event that
           STARTS NOW()
BUG#26431: Impossible to re-create an event from backup if its
           STARTS clause is in the past
WL#3698: Events: execution in local time zone

The problem was that local times specified by the user in AT, STARTS
and ENDS of CREATE EVENT/ALTER EVENT statement were converted to UTC,
and the original time zone was forgotten.  This way, event scheduler
couldn't honor Daylight Saving Time shifts, and times shown to the
user were also in UTC.  Additionally, CREATE EVENT didn't allow times
in the past, thus preventing straightforward event restoration from
old backups.

This patch reworks event scheduler time computations, performing them
in the time zone associated with the event.  Also it allows times to
be in the past.

The patch adds time_zone column to mysql.event table.

NOTE: The patch is almost final, but the bug#9953 should be pushed
first.


client/mysqldump.c:
  Before every CREATE EVENT, output its time zone.
mysql-test/include/wait_condition.inc:
  Add optional $wait_timeout parameter.
mysql-test/lib/init_db.sql:
  Add time_zone column.
mysql-test/r/events.result:
  Update result.
mysql-test/r/events_bugs.result:
  Update result.
mysql-test/r/events_grant.result:
  Update result.
mysql-test/r/events_restart_phase1.result:
  Update result.
mysql-test/r/events_scheduling.result:
  Update result.
mysql-test/r/mysqldump.result:
  Update result.
mysql-test/r/ps.result:
  Update result.
mysql-test/r/system_mysql_db.result:
  Update result.
mysql-test/t/events.test:
  Remove STARTS from the result, as it depends on current time.
mysql-test/t/events_bugs.test:
  Time in the past is no longer an error.
mysql-test/t/events_restart_phase1.test:
  Fill new column 'time_zone' in mysql.event.
mysql-test/t/events_scheduling.test:
  Cleanup: disable event scheduler.
scripts/mysql_create_system_tables.sh:
  Add new column 'time_zone' to mysql.event.
scripts/mysql_fix_privilege_tables.sql:
  Add new column 'time_zone' to mysql.event.
sql/event_data_objects.cc:
  The essence of the change is the following:
   - for internal times use my_time_t instead of TIME.  Assignment and
     comparison is done now on plain numbers.
   - in init_execute_at(), init_starts(), init_ends() convert given time
     to number of seconds since Epoch (aka Unix time, in UTC).
   - handle time_zone field loading and storing.
   - in get_next_time(), Unix time is converted back to event time zone,
     interval is added, and the result is converted to UTC again.
   - fix Event_timed::get_create_event() to report STARTS and ENDS.
   - before executing the event body we set thread time zone to the
     event time zone.
sql/event_data_objects.h:
  Add time_zone member to Event_basic class.
  
  Store internal times in my_time_t (number of seconds since Epoch),
  rather than in broken down TIME structure.
sql/event_db_repository.cc:
  Add time_zone column handling.
  
  Give a warning and do not create an event if its execution time is in
  the past, and ON COMPLETION NOT PRESERVE is set, because such an event
  should be dropped by that time.  Also, do not allow ALTER EVENT to
  set execution time in the past when ON COMPLETION NOT PRESERVE is set.
sql/event_db_repository.h:
  Add enum member for new time zone column.
sql/event_queue.cc:
  Replace handling of broken down times with simple handling of
  my_time_t.
sql/event_queue.h:
  Store internal times in my_time_t (number of seconds since Epoch),
  rather than in broken down TIME structure.
sql/event_scheduler.cc:
  Add TODO comment.
sql/events.cc:
  Send time_zone column for SHOW CREATE EVENT.
sql/share/errmsg.txt:
  Update error message, and add two more errors.
sql/sql_show.cc:
  Add TIME_ZONE column to the output of SHOW EVENTS.
mysql-test/r/events_time_zone.result:
  BitKeeper file /home/tomash/src/mysql_ab/mysql-5.1-wl3698/mysql-test/r/events_time_zone.result
mysql-test/t/events_time_zone.test:
  BitKeeper file /home/tomash/src/mysql_ab/mysql-5.1-wl3698/mysql-test/t/events_time_zone.test
2007-03-16 17:31:07 +03:00

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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; version 2 of the License.
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.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
*/
/*
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.
*/
/*
Keep the order of the first to as in var_typelib
sys_var_event_scheduler::value_ptr() references this array. Keep in
mind!
*/
static const char *opt_event_scheduler_state_names[]=
{ "OFF", "ON", "0", "1", "DISABLED", NullS };
TYPELIB Events::opt_typelib=
{
array_elements(opt_event_scheduler_state_names)-1,
"",
opt_event_scheduler_state_names,
NULL
};
/*
The order should not be changed. We consider OFF to be equivalent of INT 0
And ON of 1. If OFF & ON are interchanged the logic in
sys_var_event_scheduler::update() will be broken!
*/
static const char *var_event_scheduler_state_names[]= { "OFF", "ON", NullS };
TYPELIB Events::var_typelib=
{
array_elements(var_event_scheduler_state_names)-1,
"",
var_event_scheduler_state_names,
NULL
};
static
Event_queue events_event_queue;
static
Event_scheduler events_event_scheduler;
Event_db_repository events_event_db_repository;
Events Events::singleton;
enum Events::enum_opt_event_scheduler Events::opt_event_scheduler=
Events::EVENTS_OFF;
/*
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
*/
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;
}
/*
Constructor of Events class. It's called when events.o
is loaded. Assigning addressed of static variables in this
object file.
SYNOPSIS
Events::Events()
*/
Events::Events()
{
scheduler= &events_event_scheduler;
event_queue= &events_event_queue;
db_repository= &events_event_db_repository;
}
/*
The function exported to the world for creating of events.
SYNOPSIS
Events::create_event()
thd [in] THD
parse_data [in] Event's data from parsing stage
if_not_exists [in] Whether IF NOT EXISTS was specified in the DDL
RETURN VALUE
FALSE OK
TRUE Error (Reported)
NOTES
In case there is an event with the same name (db) and
IF NOT EXISTS is specified, an warning is put into the stack.
*/
bool
Events::create_event(THD *thd, Event_parse_data *parse_data, bool if_not_exists)
{
int ret;
DBUG_ENTER("Events::create_event");
if (unlikely(check_system_tables_error))
{
my_error(ER_EVENTS_DB_ERROR, MYF(0));
DBUG_RETURN(TRUE);
}
pthread_mutex_lock(&LOCK_event_metadata);
/* On error conditions my_error() is called so no need to handle here */
if (!(ret= db_repository->create_event(thd, parse_data, if_not_exists)) &&
!parse_data->do_not_create)
{
Event_queue_element *new_element;
if (!(new_element= new Event_queue_element()))
ret= TRUE; // OOM
else if ((ret= db_repository->load_named_event(thd, parse_data->dbname,
parse_data->name,
new_element)))
{
DBUG_ASSERT(ret == OP_LOAD_ERROR);
delete new_element;
}
else
event_queue->create_event(thd, new_element);
}
pthread_mutex_unlock(&LOCK_event_metadata);
DBUG_RETURN(ret);
}
/*
The function exported to the world for alteration of events.
SYNOPSIS
Events::update_event()
thd [in] THD
parse_data [in] Event's data from parsing stage
rename_to [in] Set in case of RENAME TO.
RETURN VALUE
FALSE OK
TRUE 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
*/
bool
Events::update_event(THD *thd, Event_parse_data *parse_data, sp_name *rename_to)
{
int ret;
Event_queue_element *new_element;
DBUG_ENTER("Events::update_event");
LEX_STRING *new_dbname= rename_to ? &rename_to->m_db : NULL;
LEX_STRING *new_name= rename_to ? &rename_to->m_name : NULL;
if (unlikely(check_system_tables_error))
{
my_error(ER_EVENTS_DB_ERROR, MYF(0));
DBUG_RETURN(TRUE);
}
pthread_mutex_lock(&LOCK_event_metadata);
/* On error conditions my_error() is called so no need to handle here */
if (!(ret= db_repository->update_event(thd, parse_data, new_dbname, new_name)))
{
LEX_STRING dbname= new_dbname ? *new_dbname : parse_data->dbname;
LEX_STRING name= new_name ? *new_name : parse_data->name;
if (!(new_element= new Event_queue_element()))
ret= TRUE; // OOM
else if ((ret= db_repository->load_named_event(thd, dbname, name,
new_element)))
{
DBUG_ASSERT(ret == OP_LOAD_ERROR);
delete new_element;
}
else
event_queue->update_event(thd, parse_data->dbname, parse_data->name,
new_element);
}
pthread_mutex_unlock(&LOCK_event_metadata);
DBUG_RETURN(ret);
}
/*
Drops an event
SYNOPSIS
Events::drop_event()
thd [in] THD
dbname [in] Event's schema
name [in] Event's name
if_exists [in] When set and the event does not exist =>
warning onto the stack
RETURN VALUE
FALSE OK
TRUE Error (reported)
*/
bool
Events::drop_event(THD *thd, LEX_STRING dbname, LEX_STRING name, bool if_exists)
{
int ret;
DBUG_ENTER("Events::drop_event");
if (unlikely(check_system_tables_error))
{
my_error(ER_EVENTS_DB_ERROR, MYF(0));
DBUG_RETURN(TRUE);
}
pthread_mutex_lock(&LOCK_event_metadata);
/* On error conditions my_error() is called so no need to handle here */
if (!(ret= db_repository->drop_event(thd, dbname, name, if_exists)))
event_queue->drop_event(thd, dbname, name);
pthread_mutex_unlock(&LOCK_event_metadata);
DBUG_RETURN(ret);
}
/*
Drops all events from a schema
SYNOPSIS
Events::drop_schema_events()
thd Thread
db ASCIIZ schema name
*/
void
Events::drop_schema_events(THD *thd, char *db)
{
LEX_STRING const db_lex= { db, strlen(db) };
DBUG_ENTER("Events::drop_schema_events");
DBUG_PRINT("enter", ("dropping events from %s", db));
if (unlikely(check_system_tables_error))
{
my_error(ER_EVENTS_DB_ERROR, MYF(0));
DBUG_VOID_RETURN;
}
pthread_mutex_lock(&LOCK_event_metadata);
event_queue->drop_schema_events(thd, db_lex);
db_repository->drop_schema_events(thd, db_lex);
pthread_mutex_unlock(&LOCK_event_metadata);
DBUG_VOID_RETURN;
}
/*
SHOW CREATE EVENT
SYNOPSIS
Events::show_create_event()
thd Thread context
spn The name of the event (db, name)
RETURN VALUE
FALSE OK
TRUE Error during writing to the wire
*/
bool
Events::show_create_event(THD *thd, LEX_STRING dbname, LEX_STRING name)
{
CHARSET_INFO *scs= system_charset_info;
int ret;
Event_timed *et= new Event_timed();
DBUG_ENTER("Events::show_create_event");
DBUG_PRINT("enter", ("name: %s@%s", dbname.str, name.str));
if (unlikely(check_system_tables_error))
{
my_error(ER_EVENTS_DB_ERROR, MYF(0));
DBUG_RETURN(TRUE);
}
ret= db_repository->load_named_event(thd, dbname, name, et);
if (!ret)
{
Protocol *protocol= thd->protocol;
char show_str_buf[10 * STRING_BUFFER_USUAL_SIZE];
String show_str(show_str_buf, sizeof(show_str_buf), scs);
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));
const String *tz_name= et->time_zone->get_name();
field_list.push_back(new Item_empty_string("time_zone",
tz_name->length()));
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, scs);
protocol->store((char*) sql_mode_str, sql_mode_len, scs);
protocol->store((char*) tz_name->ptr(), tz_name->length(), scs);
protocol->store(show_str.c_ptr(), show_str.length(), scs);
ret= protocol->write();
send_eof(thd);
}
delete et;
DBUG_RETURN(ret);
err:
delete et;
DBUG_RETURN(TRUE);
}
/*
Proxy for Event_db_repository::fill_schema_events.
Callback for I_S from sql_show.cc
SYNOPSIS
Events::fill_schema_events()
thd Thread context
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");
Events *myself= get_instance();
if (unlikely(myself->check_system_tables_error))
{
my_error(ER_EVENTS_DB_ERROR, MYF(0));
DBUG_RETURN(TRUE);
}
/*
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(myself->db_repository->fill_schema_events(thd, tables, db));
}
/*
Inits the scheduler's structures.
SYNOPSIS
Events::init()
NOTES
This function is not synchronized.
RETURN VALUE
FALSE OK
TRUE Error in case the scheduler can't start
*/
bool
Events::init()
{
THD *thd;
bool res= FALSE;
DBUG_ENTER("Events::init");
if (opt_event_scheduler == Events::EVENTS_DISABLED)
DBUG_RETURN(FALSE);
/* We need a temporary THD during boot */
if (!(thd= new THD()))
{
res= TRUE;
goto end;
}
/*
The thread stack does not start from this function but we cannot
guess the real value. So better some value that doesn't assert than
no value.
*/
thd->thread_stack= (char*) &thd;
thd->store_globals();
if (check_system_tables(thd))
{
check_system_tables_error= TRUE;
sql_print_error("SCHEDULER: The system tables are damaged. "
"The scheduler subsystem will be unusable during this run.");
goto end;
}
check_system_tables_error= FALSE;
if (event_queue->init_queue(thd) || load_events_from_db(thd))
{
sql_print_error("SCHEDULER: Error while loading from disk.");
goto end;
}
scheduler->init_scheduler(event_queue);
DBUG_ASSERT(opt_event_scheduler == Events::EVENTS_ON ||
opt_event_scheduler == Events::EVENTS_OFF);
if (opt_event_scheduler == Events::EVENTS_ON)
res= scheduler->start();
Event_worker_thread::init(this, db_repository);
end:
delete thd;
/* Remember that we don't have a THD */
my_pthread_setspecific_ptr(THR_THD, NULL);
DBUG_RETURN(res);
}
/*
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");
if (likely(!check_system_tables_error))
{
scheduler->stop();
scheduler->deinit_scheduler();
event_queue->deinit_queue();
}
DBUG_VOID_RETURN;
}
/*
Inits Events mutexes
SYNOPSIS
Events::init_mutexes()
thd Thread
*/
void
Events::init_mutexes()
{
pthread_mutex_init(&LOCK_event_metadata, MY_MUTEX_INIT_FAST);
event_queue->init_mutexes();
scheduler->init_mutexes();
}
/*
Destroys Events mutexes
SYNOPSIS
Events::destroy_mutexes()
*/
void
Events::destroy_mutexes()
{
event_queue->deinit_mutexes();
scheduler->deinit_mutexes();
pthread_mutex_destroy(&LOCK_event_metadata);
}
/*
Dumps the internal status of the scheduler and the memory cache
into a table with two columns - Name & Value. Different properties
which could be useful for debugging for instance deadlocks are
returned.
SYNOPSIS
Events::dump_internal_status()
*/
void
Events::dump_internal_status()
{
DBUG_ENTER("Events::dump_internal_status");
puts("\n\n\nEvents status:");
puts("LLA = Last Locked At LUA = Last Unlocked At");
puts("WOC = Waiting On Condition DL = Data Locked");
scheduler->dump_internal_status();
event_queue->dump_internal_status();
DBUG_VOID_RETURN;
}
/*
Starts execution of events by the scheduler
SYNOPSIS
Events::start_execution_of_events()
RETURN VALUE
FALSE OK
TRUE Error
*/
bool
Events::start_execution_of_events()
{
DBUG_ENTER("Events::start_execution_of_events");
if (unlikely(check_system_tables_error))
{
my_error(ER_EVENTS_DB_ERROR, MYF(0));
DBUG_RETURN(TRUE);
}
DBUG_RETURN(scheduler->start());
}
/*
Stops execution of events by the scheduler.
Already running events will not be stopped. If the user needs
them stopped manual intervention is needed.
SYNOPSIS
Events::stop_execution_of_events()
RETURN VALUE
FALSE OK
TRUE Error
*/
bool
Events::stop_execution_of_events()
{
DBUG_ENTER("Events::stop_execution_of_events");
if (unlikely(check_system_tables_error))
{
my_error(ER_EVENTS_DB_ERROR, MYF(0));
DBUG_RETURN(TRUE);
}
DBUG_RETURN(scheduler->stop());
}
/*
Checks whether the scheduler is running or not.
SYNOPSIS
Events::is_started()
RETURN VALUE
TRUE Yes
FALSE No
*/
bool
Events::is_execution_of_events_started()
{
DBUG_ENTER("Events::is_execution_of_events_started");
if (unlikely(check_system_tables_error))
{
my_error(ER_EVENTS_DB_ERROR, MYF(0));
DBUG_RETURN(FALSE);
}
DBUG_RETURN(scheduler->is_running());
}
/*
Opens mysql.db and mysql.user and checks whether:
1. mysql.db has column Event_priv at column 20 (0 based);
2. mysql.user has column Event_priv at column 29 (0 based);
SYNOPSIS
Events::check_system_tables()
thd Thread
RETURN VALUE
FALSE OK
TRUE Error
*/
bool
Events::check_system_tables(THD *thd)
{
TABLE_LIST tables;
Open_tables_state backup;
bool ret= FALSE;
DBUG_ENTER("Events::check_system_tables");
DBUG_PRINT("enter", ("thd: 0x%lx", (long) thd));
thd->reset_n_backup_open_tables_state(&backup);
bzero((char*) &tables, sizeof(tables));
tables.db= (char*) "mysql";
tables.table_name= tables.alias= (char*) "db";
tables.lock_type= TL_READ;
if ((ret= simple_open_n_lock_tables(thd, &tables)))
{
sql_print_error("SCHEDULER: Cannot open mysql.db");
ret= TRUE;
}
ret= table_check_intact(tables.table, MYSQL_DB_FIELD_COUNT,
mysql_db_table_fields, &mysql_db_table_last_check,
ER_CANNOT_LOAD_FROM_TABLE);
close_thread_tables(thd);
bzero((char*) &tables, sizeof(tables));
tables.db= (char*) "mysql";
tables.table_name= tables.alias= (char*) "user";
tables.lock_type= TL_READ;
if (simple_open_n_lock_tables(thd, &tables))
{
sql_print_error("SCHEDULER: Cannot open mysql.user");
ret= TRUE;
}
else
{
if (tables.table->s->fields < 29 ||
strncmp(tables.table->field[29]->field_name,
STRING_WITH_LEN("Event_priv")))
{
sql_print_error("mysql.user has no `Event_priv` column at position %d",
29);
ret= TRUE;
}
close_thread_tables(thd);
}
thd->restore_backup_open_tables_state(&backup);
DBUG_RETURN(ret);
}
/*
Loads all ENABLED events from mysql.event into the prioritized
queue. Called during scheduler main thread initialization. Compiles
the events. Creates Event_queue_element instances for every ENABLED event
from mysql.event.
SYNOPSIS
Events::load_events_from_db()
thd Thread context. Used for memory allocation in some cases.
RETURN VALUE
0 OK
!0 Error (EVEX_OPEN_TABLE_FAILED, EVEX_MICROSECOND_UNSUP,
EVEX_COMPILE_ERROR) - in all these cases mysql.event was
tampered.
NOTES
Reports the error to the console
*/
int
Events::load_events_from_db(THD *thd)
{
TABLE *table;
READ_RECORD read_record_info;
int ret= -1;
uint count= 0;
bool clean_the_queue= TRUE;
DBUG_ENTER("Events::load_events_from_db");
DBUG_PRINT("enter", ("thd: 0x%lx", (long) thd));
if ((ret= db_repository->open_event_table(thd, TL_READ, &table)))
{
sql_print_error("SCHEDULER: Table mysql.event is damaged. Can not open");
DBUG_RETURN(EVEX_OPEN_TABLE_FAILED);
}
init_read_record(&read_record_info, thd, table ,NULL,1,0);
while (!(read_record_info.read_record(&read_record_info)))
{
Event_queue_element *et;
if (!(et= new Event_queue_element))
{
DBUG_PRINT("info", ("Out of memory"));
break;
}
DBUG_PRINT("info", ("Loading event from row."));
if ((ret= et->load_from_row(thd, table)))
{
sql_print_error("SCHEDULER: Error while loading from mysql.event. "
"Table probably corrupted");
break;
}
if (et->status != Event_queue_element::ENABLED)
{
DBUG_PRINT("info",("%s is disabled",et->name.str));
delete et;
continue;
}
/* let's find when to be executed */
if (et->compute_next_execution_time())
{
sql_print_error("SCHEDULER: Error while computing execution time of %s.%s."
" Skipping", et->dbname.str, et->name.str);
continue;
}
{
Event_job_data temp_job_data;
DBUG_PRINT("info", ("Event %s loaded from row. ", et->name.str));
temp_job_data.load_from_row(thd, table);
/*
We load only on scheduler root just to check whether the body
compiles.
*/
switch (ret= temp_job_data.compile(thd, thd->mem_root)) {
case EVEX_MICROSECOND_UNSUP:
sql_print_error("SCHEDULER: mysql.event is tampered. MICROSECOND is not "
"supported but found in mysql.event");
break;
case EVEX_COMPILE_ERROR:
sql_print_error("SCHEDULER: Error while compiling %s.%s. Aborting load",
et->dbname.str, et->name.str);
break;
default:
break;
}
thd->end_statement();
thd->cleanup_after_query();
}
if (ret)
{
delete et;
goto end;
}
DBUG_PRINT("load_events_from_db", ("Adding 0x%lx to the exec list.",
(long) et));
event_queue->create_event(thd, et);
count++;
}
clean_the_queue= FALSE;
end:
end_read_record(&read_record_info);
if (clean_the_queue)
{
event_queue->empty_queue();
ret= -1;
}
else
{
ret= 0;
sql_print_information("SCHEDULER: Loaded %d event%s", count,
(count == 1)?"":"s");
}
close_thread_tables(thd);
DBUG_PRINT("info", ("Status code %d. Loaded %d event(s)", ret, count));
DBUG_RETURN(ret);
}
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