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1601 lines (1328 loc) · 45.1 KB
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/*
Copyright (c) 2005, 2010, Oracle and/or its affiliates.
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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1335 USA */
#define MYSQL_LEX 1
#include "mariadb.h" /* NO_EMBEDDED_ACCESS_CHECKS */
#include "sql_priv.h"
#include "unireg.h"
#include "sql_parse.h" // parse_sql
#include "strfunc.h" // find_string_in_array
#include "sql_db.h" // get_default_db_collation
#include "sql_time.h" // interval_type_to_name,
// date_add_interval,
// calc_time_diff
#include "tztime.h" // my_tz_find, my_tz_OFFSET0, struct Time_zone
#include "sp.h" // load_charset, load_collation
#include "events.h"
#include "event_data_objects.h"
#include "event_db_repository.h"
#include "sp_head.h"
#include "sql_show.h" // append_definer, append_identifier
#include "mysql/psi/mysql_sp.h"
#include "wsrep_mysqld.h"
#ifdef WITH_WSREP
#include "wsrep_trans_observer.h"
#endif /* WITH_WSREP */
/**
@addtogroup Event_Scheduler
@{
*/
#ifdef HAVE_PSI_INTERFACE
void init_scheduler_psi_keys()
{
const char *category= "scheduler";
PSI_server->register_statement(category, & Event_queue_element_for_exec::psi_info, 1);
}
PSI_statement_info Event_queue_element_for_exec::psi_info=
{ 0, "event", 0};
#endif
/*************************************************************************/
/**
Event_creation_ctx -- creation context of events.
*/
class Event_creation_ctx :public Stored_program_creation_ctx,
public Sql_alloc
{
public:
static bool load_from_db(THD *thd,
MEM_ROOT *event_mem_root,
const char *db_name,
const char *event_name,
TABLE *event_tbl,
Stored_program_creation_ctx **ctx);
public:
Stored_program_creation_ctx *clone(MEM_ROOT *mem_root) override
{
return new (mem_root)
Event_creation_ctx(m_client_cs, m_connection_cl, m_db_cl);
}
protected:
Object_creation_ctx *create_backup_ctx(THD *thd) const override
{
/*
We can avoid usual backup/restore employed in stored programs since we
know that this is a top level statement and the worker thread is
allocated exclusively to execute this event.
*/
return NULL;
}
private:
Event_creation_ctx(CHARSET_INFO *client_cs,
CHARSET_INFO *connection_cl,
CHARSET_INFO *db_cl)
: Stored_program_creation_ctx(client_cs, connection_cl, db_cl)
{ }
};
/**************************************************************************
Event_creation_ctx implementation.
**************************************************************************/
bool
Event_creation_ctx::load_from_db(THD *thd,
MEM_ROOT *event_mem_root,
const char *db_name,
const char *event_name,
TABLE *event_tbl,
Stored_program_creation_ctx **ctx)
{
/* Load character set/collation attributes. */
CHARSET_INFO *client_cs;
CHARSET_INFO *connection_cl;
CHARSET_INFO *db_cl;
bool invalid_creation_ctx= FALSE;
if (load_charset(thd, event_mem_root,
event_tbl->field[ET_FIELD_CHARACTER_SET_CLIENT],
thd->variables.character_set_client,
&client_cs))
{
sql_print_warning("Event '%s'.'%s': invalid value "
"in column mysql.event.character_set_client.",
(const char *) db_name,
(const char *) event_name);
invalid_creation_ctx= TRUE;
}
if (load_collation(thd, event_mem_root,
event_tbl->field[ET_FIELD_COLLATION_CONNECTION],
thd->variables.collation_connection,
&connection_cl))
{
sql_print_warning("Event '%s'.'%s': invalid value "
"in column mysql.event.collation_connection.",
(const char *) db_name,
(const char *) event_name);
invalid_creation_ctx= TRUE;
}
if (load_collation(thd, event_mem_root,
event_tbl->field[ET_FIELD_DB_COLLATION],
NULL,
&db_cl))
{
sql_print_warning("Event '%s'.'%s': invalid value "
"in column mysql.event.db_collation.",
(const char *) db_name,
(const char *) event_name);
invalid_creation_ctx= TRUE;
}
/*
If we failed to resolve the database collation, load the default one
from the disk.
*/
if (!db_cl)
db_cl= get_default_db_collation(thd, db_name);
/* Create the context. */
*ctx= new Event_creation_ctx(client_cs, connection_cl, db_cl);
return invalid_creation_ctx;
}
/*************************************************************************/
/*
Initializes dbname and name of an Event_queue_element_for_exec
object
SYNOPSIS
Event_queue_element_for_exec::init()
RETURN VALUE
FALSE OK
TRUE Error (OOM)
*/
bool
Event_queue_element_for_exec::init(const LEX_CSTRING &db, const LEX_CSTRING &n)
{
if (!(dbname.str= my_strndup(key_memory_Event_queue_element_for_exec_names,
db.str, dbname.length= db.length, MYF(MY_WME))))
return TRUE;
if (!(name.str= my_strndup(key_memory_Event_queue_element_for_exec_names,
n.str, name.length= n.length, MYF(MY_WME))))
{
my_free(const_cast<char*>(dbname.str));
dbname.str= NULL;
return TRUE;
}
return FALSE;
}
/*
Destructor
SYNOPSIS
Event_queue_element_for_exec::~Event_queue_element_for_exec()
*/
Event_queue_element_for_exec::~Event_queue_element_for_exec()
{
my_free(const_cast<char*>(dbname.str));
my_free(const_cast<char*>(name.str));
}
/*
Constructor
SYNOPSIS
Event_basic::Event_basic()
*/
Event_basic::Event_basic()
{
DBUG_ENTER("Event_basic::Event_basic");
/* init memory root */
init_sql_alloc(key_memory_event_basic_root, &mem_root, 256, 512, MYF(0));
dbname.str= name.str= NULL;
dbname.length= name.length= 0;
time_zone= NULL;
DBUG_VOID_RETURN;
}
/*
Destructor
SYNOPSIS
Event_basic::Event_basic()
*/
Event_basic::~Event_basic()
{
DBUG_ENTER("Event_basic::~Event_basic");
free_root(&mem_root, MYF(0));
DBUG_VOID_RETURN;
}
/*
Short function to load a char column into a LEX_CSTRING
SYNOPSIS
Event_basic::load_string_field()
field_name The field( enum_events_table_field is not actually used
because it's unknown in event_data_objects.h)
fields The Field array
field_value The value
*/
bool
Event_basic::load_string_fields(Field **fields, ...)
{
bool ret= FALSE;
va_list args;
enum enum_events_table_field field_name;
LEX_CSTRING *field_value;
DBUG_ENTER("Event_basic::load_string_fields");
va_start(args, fields);
field_name= (enum enum_events_table_field) va_arg(args, int);
while (field_name < ET_FIELD_COUNT)
{
field_value= va_arg(args, LEX_CSTRING *);
if ((field_value->str= get_field(&mem_root, fields[field_name])) == NullS)
{
ret= TRUE;
break;
}
field_value->length= strlen(field_value->str);
field_name= (enum enum_events_table_field) va_arg(args, int);
}
va_end(args);
DBUG_RETURN(ret);
}
bool
Event_basic::load_time_zone(THD *thd, const LEX_CSTRING *tz_name)
{
String str(tz_name->str, strlen(tz_name->str), &my_charset_latin1);
time_zone= my_tz_find(thd, &str);
return (time_zone == NULL);
}
/*
Constructor
SYNOPSIS
Event_queue_element::Event_queue_element()
*/
Event_queue_element::Event_queue_element():
on_completion(Event_parse_data::ON_COMPLETION_DROP),
status(Event_parse_data::ENABLED), expression(0), dropped(FALSE),
execution_count(0)
{
DBUG_ENTER("Event_queue_element::Event_queue_element");
starts= ends= execute_at= last_executed= 0;
starts_null= ends_null= execute_at_null= TRUE;
DBUG_VOID_RETURN;
}
/*
Destructor
SYNOPSIS
Event_queue_element::Event_queue_element()
*/
Event_queue_element::~Event_queue_element() = default;
/*
Constructor
SYNOPSIS
Event_timed::Event_timed()
*/
Event_timed::Event_timed():
created(0), modified(0), sql_mode(0)
{
DBUG_ENTER("Event_timed::Event_timed");
init();
DBUG_VOID_RETURN;
}
/*
Destructor
SYNOPSIS
Event_timed::~Event_timed()
*/
Event_timed::~Event_timed() = default;
/*
Constructor
SYNOPSIS
Event_job_data::Event_job_data()
*/
Event_job_data::Event_job_data()
:sql_mode(0)
{
}
/*
Init all member variables
SYNOPSIS
Event_timed::init()
*/
void
Event_timed::init()
{
DBUG_ENTER("Event_timed::init");
definer_user.str= definer_host.str= body.str= comment.str= NULL;
definer_user.length= definer_host.length= body.length= comment.length= 0;
sql_mode= 0;
DBUG_VOID_RETURN;
}
/**
Load an event's body from a row from mysql.event.
@details This method is silent on errors and should behave like that.
Callers should handle throwing of error messages. The reason is that the
class should not know about how to deal with communication.
@return Operation status
@retval FALSE OK
@retval TRUE Error
*/
bool
Event_job_data::load_from_row(THD *thd, TABLE *table)
{
const char *ptr;
size_t len;
LEX_CSTRING tz_name;
DBUG_ENTER("Event_job_data::load_from_row");
if (!table)
DBUG_RETURN(TRUE);
if (table->s->fields < ET_FIELD_COUNT)
DBUG_RETURN(TRUE);
if (load_string_fields(table->field,
ET_FIELD_DB, &dbname,
ET_FIELD_NAME, &name,
ET_FIELD_BODY, &body,
ET_FIELD_DEFINER, &definer,
ET_FIELD_TIME_ZONE, &tz_name,
ET_FIELD_COUNT))
DBUG_RETURN(TRUE);
if (load_time_zone(thd, &tz_name))
DBUG_RETURN(TRUE);
Event_creation_ctx::load_from_db(thd, &mem_root, dbname.str, name.str, table,
&creation_ctx);
ptr= strchr(definer.str, '@');
if (! ptr)
ptr= definer.str;
len= ptr - definer.str;
definer_user.str= strmake_root(&mem_root, definer.str, len);
definer_user.length= len;
len= definer.length - len - 1;
/* 1:because of @ */
definer_host.str= strmake_root(&mem_root, ptr + 1, len);
definer_host.length= len;
sql_mode= (sql_mode_t) table->field[ET_FIELD_SQL_MODE]->val_int();
DBUG_RETURN(FALSE);
}
/**
Load an event's body from a row from mysql.event.
@details This method is silent on errors and should behave like that.
Callers should handle throwing of error messages. The reason is that the
class should not know about how to deal with communication.
@return Operation status
@retval FALSE OK
@retval TRUE Error
*/
bool
Event_queue_element::load_from_row(THD *thd, TABLE *table)
{
const char *ptr;
MYSQL_TIME time;
LEX_CSTRING tz_name;
DBUG_ENTER("Event_queue_element::load_from_row");
if (!table)
DBUG_RETURN(TRUE);
if (table->s->fields < ET_FIELD_COUNT)
DBUG_RETURN(TRUE);
if (load_string_fields(table->field,
ET_FIELD_DB, &dbname,
ET_FIELD_NAME, &name,
ET_FIELD_DEFINER, &definer,
ET_FIELD_TIME_ZONE, &tz_name,
ET_FIELD_COUNT))
DBUG_RETURN(TRUE);
if (load_time_zone(thd, &tz_name))
DBUG_RETURN(TRUE);
starts_null= table->field[ET_FIELD_STARTS]->is_null();
uint not_used;
if (!starts_null)
{
/*
The expected data type for these columns in mysql.events:
starts, ends, execute_at, last_executed
is DATETIME. No nanosecond truncation should normally be needed,
unless the DBA changes them, e.g. to VARCHAR, DECIMAL, etc.
For this unexpected case let's use the default round mode,
according to the current session settings.
*/
table->field[ET_FIELD_STARTS]->get_date(&time, TIME_NO_ZERO_DATE |
thd->temporal_round_mode());
starts= my_tz_OFFSET0->TIME_to_gmt_sec(&time,¬_used);
}
ends_null= table->field[ET_FIELD_ENDS]->is_null();
if (!ends_null)
{
table->field[ET_FIELD_ENDS]->get_date(&time, TIME_NO_ZERO_DATE |
thd->temporal_round_mode());
ends= my_tz_OFFSET0->TIME_to_gmt_sec(&time,¬_used);
}
if (!table->field[ET_FIELD_INTERVAL_EXPR]->is_null())
expression= table->field[ET_FIELD_INTERVAL_EXPR]->val_int();
else
expression= 0;
/*
If neither STARTS and ENDS is set, then both fields are empty.
Hence, if ET_FIELD_EXECUTE_AT is empty there is an error.
*/
execute_at_null= table->field[ET_FIELD_EXECUTE_AT]->is_null();
DBUG_ASSERT(!(starts_null && ends_null && !expression && execute_at_null));
if (!expression && !execute_at_null)
{
if (table->field[ET_FIELD_EXECUTE_AT]->get_date(&time, TIME_NO_ZERO_DATE |
thd->temporal_round_mode()))
DBUG_RETURN(TRUE);
execute_at= my_tz_OFFSET0->TIME_to_gmt_sec(&time,¬_used);
}
/*
We load the interval type from disk as string and then map it to
an integer. This decouples the values of enum interval_type
and values actually stored on disk. Therefore the type can be
reordered without risking incompatibilities of data between versions.
*/
if (!table->field[ET_FIELD_TRANSIENT_INTERVAL]->is_null())
{
int i;
char buff[MAX_FIELD_WIDTH];
String str(buff, sizeof(buff), &my_charset_bin);
LEX_CSTRING tmp;
table->field[ET_FIELD_TRANSIENT_INTERVAL]->val_str(&str);
if (!(tmp.length= str.length()))
DBUG_RETURN(TRUE);
tmp.str= str.c_ptr_safe();
i= find_string_in_array(interval_type_to_name, &tmp, system_charset_info);
if (i < 0)
DBUG_RETURN(TRUE);
interval= (interval_type) i;
}
if (!table->field[ET_FIELD_LAST_EXECUTED]->is_null())
{
table->field[ET_FIELD_LAST_EXECUTED]->get_date(&time, TIME_NO_ZERO_DATE |
thd->temporal_round_mode());
last_executed= my_tz_OFFSET0->TIME_to_gmt_sec(&time,¬_used);
}
if ((ptr= get_field(&mem_root, table->field[ET_FIELD_STATUS])) == NullS)
DBUG_RETURN(TRUE);
DBUG_PRINT("load_from_row", ("Event [%s] is [%s]", name.str, ptr));
/* Set event status (ENABLED | SLAVESIDE_DISABLED | DISABLED) */
switch (ptr[0])
{
case 'E' :
status = Event_parse_data::ENABLED;
break;
case 'S' :
status = Event_parse_data::SLAVESIDE_DISABLED;
break;
case 'D' :
default:
status = Event_parse_data::DISABLED;
break;
}
if ((ptr= get_field(&mem_root, table->field[ET_FIELD_ORIGINATOR])) == NullS)
DBUG_RETURN(TRUE);
originator = (uint32) table->field[ET_FIELD_ORIGINATOR]->val_int();
/* ToDo : Andrey . Find a way not to allocate ptr on event_mem_root */
if ((ptr= get_field(&mem_root,
table->field[ET_FIELD_ON_COMPLETION])) == NullS)
DBUG_RETURN(TRUE);
on_completion= (ptr[0]=='D'? Event_parse_data::ON_COMPLETION_DROP:
Event_parse_data::ON_COMPLETION_PRESERVE);
DBUG_RETURN(FALSE);
}
/**
Load an event's body from a row from mysql.event.
@details This method is silent on errors and should behave like that.
Callers should handle throwing of error messages. The reason is that the
class should not know about how to deal with communication.
@return Operation status
@retval FALSE OK
@retval TRUE Error
*/
bool
Event_timed::load_from_row(THD *thd, TABLE *table)
{
const char *ptr;
size_t len;
DBUG_ENTER("Event_timed::load_from_row");
if (Event_queue_element::load_from_row(thd, table))
DBUG_RETURN(TRUE);
if (load_string_fields(table->field,
ET_FIELD_BODY, &body,
ET_FIELD_BODY_UTF8, &body_utf8,
ET_FIELD_COUNT))
DBUG_RETURN(TRUE);
if (Event_creation_ctx::load_from_db(thd, &mem_root, dbname.str, name.str,
table, &creation_ctx))
{
push_warning_printf(thd,
Sql_condition::WARN_LEVEL_WARN,
ER_EVENT_INVALID_CREATION_CTX,
ER_THD(thd, ER_EVENT_INVALID_CREATION_CTX),
(const char *) dbname.str,
(const char *) name.str);
}
ptr= strchr(definer.str, '@');
if (! ptr)
ptr= definer.str;
len= ptr - definer.str;
definer_user.str= strmake_root(&mem_root, definer.str, len);
definer_user.length= len;
len= definer.length - len - 1;
/* 1:because of @ */
definer_host.str= strmake_root(&mem_root, ptr + 1, len);
definer_host.length= len;
created= table->field[ET_FIELD_CREATED]->val_int();
modified= table->field[ET_FIELD_MODIFIED]->val_int();
comment.str= get_field(&mem_root, table->field[ET_FIELD_COMMENT]);
if (comment.str != NullS)
comment.length= strlen(comment.str);
else
comment.length= 0;
sql_mode= (sql_mode_t) table->field[ET_FIELD_SQL_MODE]->val_int();
DBUG_RETURN(FALSE);
}
/*
add_interval() adds a specified interval to time 'ltime' in time
zone 'time_zone', and returns the result converted to the number of
seconds since epoch (aka Unix time; in UTC time zone). Zero result
means an error.
*/
static
my_time_t
add_interval(MYSQL_TIME *ltime, const Time_zone *time_zone,
interval_type scale, INTERVAL interval)
{
if (date_add_interval(current_thd, ltime, scale, interval))
return 0;
uint not_used;
return time_zone->TIME_to_gmt_sec(ltime, ¬_used);
}
/*
Computes the sum of a timestamp plus interval.
SYNOPSIS
get_next_time()
time_zone event time zone
next the sum
start add interval_value to this time
time_now current time
i_value quantity of time type interval to add
i_type type of interval to add (SECOND, MINUTE, HOUR, WEEK ...)
RETURN VALUE
0 OK
1 Error
NOTES
1) If the interval is conversible to SECOND, like MINUTE, HOUR, DAY, WEEK.
Then we use TIMEDIFF()'s implementation as underlying and number of
seconds as resolution for computation.
2) In all other cases - MONTH, QUARTER, YEAR we use MONTH as resolution
and PERIOD_DIFF()'s implementation
*/
static
bool get_next_time(const Time_zone *time_zone, my_time_t *next,
my_time_t start, my_time_t time_now,
int i_value, interval_type i_type)
{
DBUG_ENTER("get_next_time");
DBUG_PRINT("enter", ("start: %lu now: %lu", (long) start, (long) time_now));
DBUG_ASSERT(start <= time_now);
longlong months=0, seconds=0;
switch (i_type) {
case INTERVAL_YEAR:
months= i_value*12;
break;
case INTERVAL_QUARTER:
/* Has already been converted to months */
case INTERVAL_YEAR_MONTH:
case INTERVAL_MONTH:
months= i_value;
break;
case INTERVAL_WEEK:
/* WEEK has already been converted to days */
case INTERVAL_DAY:
seconds= i_value*24*3600;
break;
case INTERVAL_DAY_HOUR:
case INTERVAL_HOUR:
seconds= i_value*3600;
break;
case INTERVAL_DAY_MINUTE:
case INTERVAL_HOUR_MINUTE:
case INTERVAL_MINUTE:
seconds= i_value*60;
break;
case INTERVAL_DAY_SECOND:
case INTERVAL_HOUR_SECOND:
case INTERVAL_MINUTE_SECOND:
case INTERVAL_SECOND:
seconds= i_value;
break;
case INTERVAL_DAY_MICROSECOND:
case INTERVAL_HOUR_MICROSECOND:
case INTERVAL_MINUTE_MICROSECOND:
case INTERVAL_SECOND_MICROSECOND:
case INTERVAL_MICROSECOND:
/*
We should return an error here so SHOW EVENTS/ SELECT FROM I_S.EVENTS
would give an error then.
*/
DBUG_RETURN(1);
case INTERVAL_LAST:
DBUG_ASSERT(0);
}
DBUG_PRINT("info", ("seconds: %ld months: %ld", (long) seconds, (long) months));
MYSQL_TIME local_start;
MYSQL_TIME local_now;
/* Convert times from UTC to local. */
{
time_zone->gmt_sec_to_TIME(&local_start, start);
time_zone->gmt_sec_to_TIME(&local_now, time_now);
}
INTERVAL interval;
bzero(&interval, sizeof(interval));
my_time_t next_time= 0;
if (seconds)
{
ulonglong seconds_diff;
ulong microsec_diff;
bool negative= calc_time_diff(&local_now, &local_start, 1,
&seconds_diff, µsec_diff);
if (!negative)
{
/*
The formula below returns the interval that, when added to
local_start, will always give the time in the future.
*/
interval.second= seconds_diff - seconds_diff % seconds + seconds;
next_time= add_interval(&local_start, time_zone,
INTERVAL_SECOND, interval);
if (next_time == 0)
goto done;
}
if (next_time <= time_now)
{
/*
If 'negative' is true above, then 'next_time == 0', and
'next_time <= time_now' is also true. If negative is false,
then next_time was set, but perhaps to the value that is less
then time_now. See below for elaboration.
*/
DBUG_ASSERT(negative || next_time > 0);
/*
If local_now < local_start, i.e. STARTS time is in the future
according to the local time (it always in the past according
to UTC---this is a prerequisite of this function), then
STARTS is almost always in the past according to the local
time too. However, in the time zone that has backward
Daylight Saving Time shift, the following may happen: suppose
we have a backward DST shift at certain date after 2:59:59,
i.e. local time goes 1:59:59, 2:00:00, ... , 2:59:59, (shift
here) 2:00:00 (again), ... , 2:59:59 (again), 3:00:00, ... .
Now suppose the time has passed the first 2:59:59, has been
shifted backward, and now is (the second) 2:20:00. The user
does CREATE EVENT with STARTS 'current-date 2:40:00'. Local
time 2:40:00 from create statement is treated by time
functions as the first such time, so according to UTC it comes
before the second 2:20:00. But according to local time it is
obviously in the future, so we end up in this branch.
Since we are in the second pass through 2:00:00--2:59:59, and
any local time form this interval is treated by system
functions as the time from the first pass, we have to find the
time for the next execution that is past the DST-affected
interval (past the second 2:59:59 for our example,
i.e. starting from 3:00:00). We do this in the loop until the
local time is mapped onto future UTC time. 'start' time is in
the past, so we may use 'do { } while' here, and add the first
interval right away.
Alternatively, it could be that local_now >= local_start. Now
for the example above imagine we do CREATE EVENT with STARTS
'current-date 2:10:00'. Local start 2:10 is in the past (now
is local 2:20), so we add an interval, and get next execution
time, say, 2:40. It is in the future according to local time,
but, again, since we are in the second pass through
2:00:00--2:59:59, 2:40 will be converted into UTC time in the
past. So we will end up in this branch again, and may add
intervals in a 'do { } while' loop.
Note that for any given event we may end up here only if event
next execution time will map to the time interval that is
passed twice, and only if the server was started during the
second pass, or the event is being created during the second
pass. After that, we never will get here (unless we again
start the server during the second pass). In other words,
such a condition is extremely rare.
*/
interval.second= seconds;
do
{
next_time= add_interval(&local_start, time_zone,
INTERVAL_SECOND, interval);
if (next_time == 0)
goto done;
}
while (next_time <= time_now);
}
}
else
{
long diff_months= ((long) local_now.year - (long) local_start.year)*12 +
((long) local_now.month - (long) local_start.month);
/*
Unlike for seconds above, the formula below returns the interval
that, when added to the local_start, will give the time in the
past, or somewhere in the current month. We are interested in
the latter case, to see if this time has already passed, or is
yet to come this month.
Note that the time is guaranteed to be in the past unless
(diff_months % months == 0), but no good optimization is
possible here, because (diff_months % months == 0) is what will
happen most of the time, as get_next_time() will be called right
after the execution of the event. We could pass last_executed
time to this function, and see if the execution has already
happened this month, but for that we will have to convert
last_executed from seconds since epoch to local broken-down
time, and this will greatly reduce the effect of the
optimization. So instead we keep the code simple and clean.
*/
interval.month= (ulong) (diff_months - diff_months % months);
next_time= add_interval(&local_start, time_zone,
INTERVAL_MONTH, interval);
if (next_time == 0)
goto done;
if (next_time <= time_now)
{
interval.month= (ulong) months;
next_time= add_interval(&local_start, time_zone,
INTERVAL_MONTH, interval);
if (next_time == 0)
goto done;
}
}
DBUG_ASSERT(time_now < next_time);
*next= next_time;
done:
DBUG_PRINT("info", ("next_time: %ld", (long) next_time));
DBUG_RETURN(next_time == 0);
}
/*
Computes next execution time.
SYNOPSIS
Event_queue_element::compute_next_execution_time()
RETURN VALUE
FALSE OK
TRUE Error
NOTES
The time is set in execute_at, if no more executions the latter is
set to 0.
*/
bool
Event_queue_element::compute_next_execution_time()
{
my_time_t time_now;
DBUG_ENTER("Event_queue_element::compute_next_execution_time");
DBUG_PRINT("enter", ("starts: %lu ends: %lu last_executed: %lu this: %p",
(long) starts, (long) ends, (long) last_executed,
this));
if (status != Event_parse_data::ENABLED)
{
DBUG_PRINT("compute_next_execution_time",
("Event %s is DISABLED", name.str));
goto ret;
}
/* If one-time, no need to do computation */
if (!expression)
{
/* Let's check whether it was executed */
if (last_executed)
{
DBUG_PRINT("info",("One-time event %s.%s of was already executed",
dbname.str, name.str));
dropped= (on_completion == Event_parse_data::ON_COMPLETION_DROP);
DBUG_PRINT("info",("One-time event will be dropped: %d.", dropped));
status= Event_parse_data::DISABLED;
}
goto ret;
}
time_now= current_thd->query_start();
DBUG_PRINT("info",("NOW: [%lu]", (ulong) time_now));
/* if time_now is after ends don't execute anymore */
if (!ends_null && ends < time_now)
{
DBUG_PRINT("info", ("NOW after ENDS, don't execute anymore"));
/* time_now is after ends. don't execute anymore */
execute_at= 0;
execute_at_null= TRUE;
if (on_completion == Event_parse_data::ON_COMPLETION_DROP)
dropped= TRUE;
DBUG_PRINT("info", ("Dropped: %d", dropped));
status= Event_parse_data::DISABLED;
goto ret;
}
/*
Here time_now is before or equals ends if the latter is set.
Let's check whether time_now is before starts.
If so schedule for starts.
*/
if (!starts_null && time_now <= starts)
{
if (time_now == starts && starts == last_executed)
{
/*
do nothing or we will schedule for second time execution at starts.
*/
}
else
{
DBUG_PRINT("info", ("STARTS is future, NOW <= STARTS,sched for STARTS"));
/*
starts is in the future