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mariadb/sql/event_timed.cc
unknown 8d4f74be2d - final fixes for bug#16431 (Events: An event which alters itself disappears) 
- fix for bug#16423 (Events: SHOW CREATE EVENT doesn't work)
- this Changeset commits makes CREATE/UPDATE/DELETE EVENT real DDL statements
  by committing the currently open transaction before they are executed.
- this Changeset also fixes a trailing space problem since the very early days
  of the internal cron
- adds sophisticated checking of whether mysql.event was tampered accidentally
  or with purpose by an user.
- adds a lot of inline function documentation - documents everything left
  uncodumented
- INTERVAL_XXXX to XXX in I_S.EVENTS.INTERVAL_FIELD

WL#1034 (Internal CRON)


mysql-test/r/events.result:
  update result
mysql-test/t/events.test:
  add test cases for SHOW CREATE EVENT
  add test cases where the structure of mysql.event is changed and error reporting in this case
sql/event.cc:
  - do a lot more checking on mysql.event whether it's valid
    introduced generic function table_check_intact() which can be used also
    for checking whether a system table (mysql.*) has been tampered by user
    and report an error in this case. The checking is quite strict, thus
    maybe some mechanism can be added later that loosens this like some
    session variable, for instance, i_am_aware_that_i_can_damage_my_data
    so the table will be opened nevertheless we think that it's not valid.
  - add evex_show_create_event(THD *thd, sp_name *spn, LEX_STRING definer)
  - document a loooot. not a single function left undocumented.
sql/event.h:
  - add evex_show_create_event(THD *thd, sp_name *spn, LEX_STRING definer)
  - change get_show_create_event() to get_create_event()
  - add TABLE_FIELD_W_TYPE used by table_check_intact()
  - add event_timed::sql_mode so it can be used by show create event. currently
    always 0, will be fixed by a patch for another bug. At least makes the code
    of show create event complete.
sql/event_executor.cc:
  - add evex_check_system_tables() that checks on boot and event
    main thread startup that mysql.db and mysql.user tables are correct.
  - document everything!
sql/event_priv.h:
  remove a line
sql/event_timed.cc:
  - implement SHOW CREATE EVENT
  - document undocumented functions!
sql/share/errmsg.txt:
  - fix an error message and add two new
sql/sql_acl.cc:
  - add mysql.db table definition to use by table_check_intact()
  - exchange some of the positions by numbers from mysql.db to enum names (see sql_acl.h)
sql/sql_acl.h:
  - define the structure of mysql.db table
sql/sql_parse.cc:
  - handle SQLCOM_SHOW_CREATE_EVENT
  - end the current transaction becase CREATE/UPDATE/DELETE EVENT is a DDL
    statement
sql/sql_show.cc:
  - remove interval_type_to_name
  - use common function event_reconstruct_interval_expression()
    that reconstructs the expression given at create/alter, to some
    extent - interval of 2:62 MINUTE_SECOND will be reconstructed as
    interval of 3:02 MINUTE_SECOND!
sql/sql_yacc.yy:
  init the definer of event_timed also when doing SHOW CREATE EVENT
  because it's needed for checking into mysql.event
sql/table.cc:
  - remove stale code. only mysql.event should be a 'system_table'
  - add table_check_intact() to check the consistency of a table.
    mostly usable with mysql.xxx tables.
sql/table.h:
  - export TABLE_FIELD_W_TYPE and table_check_intact() which are used for 
    checking the structure of a table. mostly usable for mysql.xxx tables.
2006-02-14 16:20:48 +01:00

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/* Copyright (C) 2004-2005 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 "event_priv.h"
#include "event.h"
#include "sp.h"
extern int yyparse(void *thd);
/*
Init all member variables
SYNOPSIS
event_timed::init()
*/
void
event_timed::init()
{
DBUG_ENTER("event_timed::init");
dbname.str= name.str= body.str= comment.str= 0;
dbname.length= name.length= body.length= comment.length= 0;
set_zero_time(&starts, MYSQL_TIMESTAMP_DATETIME);
set_zero_time(&ends, MYSQL_TIMESTAMP_DATETIME);
set_zero_time(&execute_at, MYSQL_TIMESTAMP_DATETIME);
set_zero_time(&last_executed, MYSQL_TIMESTAMP_DATETIME);
definer_user.str= definer_host.str= 0;
definer_user.length= definer_host.length= 0;
DBUG_VOID_RETURN;
}
/*
Set a name of the event
SYNOPSIS
event_timed::init_name()
thd THD
spn the name extracted in the parser
*/
void
event_timed::init_name(THD *thd, sp_name *spn)
{
DBUG_ENTER("event_timed::init_name");
uint n; /* Counter for nul trimming */
/* During parsing, we must use thd->mem_root */
MEM_ROOT *root= thd->mem_root;
/* We have to copy strings to get them into the right memroot */
if (spn)
{
dbname.length= spn->m_db.length;
if (spn->m_db.length == 0)
dbname.str= NULL;
else
dbname.str= strmake_root(root, spn->m_db.str, spn->m_db.length);
name.length= spn->m_name.length;
name.str= strmake_root(root, spn->m_name.str, spn->m_name.length);
if (spn->m_qname.length == 0)
spn->init_qname(thd);
}
else if (thd->db)
{
dbname.length= thd->db_length;
dbname.str= strmake_root(root, thd->db, dbname.length);
}
DBUG_PRINT("dbname", ("len=%d db=%s",dbname.length, dbname.str));
DBUG_PRINT("name", ("len=%d name=%s",name.length, name.str));
DBUG_VOID_RETURN;
}
/*
Set body of the event - what should be executed.
SYNOPSIS
event_timed::init_body()
thd THD
NOTE
The body is extracted by copying all data between the
start of the body set by another method and the current pointer in Lex.
*/
void
event_timed::init_body(THD *thd)
{
DBUG_ENTER("event_timed::init_body");
MEM_ROOT *root= thd->mem_root;
body.length= thd->lex->ptr - body_begin;
// Trim nuls at the end
while (body.length && body_begin[body.length-1] == '\0')
body.length--;
//the first is always space which I cannot skip in the parser
DBUG_ASSERT(*body_begin == ' ');
body.length--;
body.str= strmake_root(root, (char *)body_begin + 1, body.length);
DBUG_VOID_RETURN;
}
/*
Set time for execution for one time events.
SYNOPSIS
event_timed::init_execute_at()
expr when (datetime)
RETURNS
0 - OK
EVEX_PARSE_ERROR - fix_fields failed
EVEX_BAD_PARAMS - datetime is in the past
ER_WRONG_VALUE - wrong value for execute at
*/
int
event_timed::init_execute_at(THD *thd, Item *expr)
{
my_bool not_used;
TIME ltime;
my_time_t my_time_tmp;
TIME time_tmp;
DBUG_ENTER("event_timed::init_execute_at");
if (expr->fix_fields(thd, &expr))
DBUG_RETURN(EVEX_PARSE_ERROR);
// let's check whether time is in the past
thd->variables.time_zone->gmt_sec_to_TIME(&time_tmp,
(my_time_t) thd->query_start());
if ((not_used= expr->get_date(&ltime, TIME_NO_ZERO_DATE)))
DBUG_RETURN(ER_WRONG_VALUE);
if (TIME_to_ulonglong_datetime(&ltime) <
TIME_to_ulonglong_datetime(&time_tmp))
DBUG_RETURN(EVEX_BAD_PARAMS);
/*
This may result in a 1970-01-01 date if ltime is > 2037-xx-xx
CONVERT_TZ has similar problem
*/
my_tz_UTC->gmt_sec_to_TIME(&ltime, TIME_to_timestamp(thd,&ltime, &not_used));
execute_at= ltime;
DBUG_RETURN(0);
}
/*
Set time for execution for transient events.
SYNOPSIS
event_timed::init_interval()
expr how much?
new_interval what is the interval
RETURNS
0 - OK
EVEX_PARSE_ERROR - fix_fields failed
EVEX_BAD_PARAMS - Interval is not positive
*/
int
event_timed::init_interval(THD *thd, Item *expr, interval_type new_interval)
{
longlong tmp;
String value;
INTERVAL interval;
DBUG_ENTER("event_timed::init_interval");
if (expr->fix_fields(thd, &expr))
DBUG_RETURN(EVEX_PARSE_ERROR);
value.alloc(MAX_DATETIME_FULL_WIDTH*MY_CHARSET_BIN_MB_MAXLEN);
if (get_interval_value(expr, new_interval, &value, &interval))
DBUG_RETURN(EVEX_PARSE_ERROR);
expression= 0;
switch (new_interval) {
case INTERVAL_YEAR:
expression= interval.year;
break;
case INTERVAL_QUARTER:
case INTERVAL_MONTH:
expression= interval.month;
break;
case INTERVAL_WEEK:
case INTERVAL_DAY:
expression= interval.day;
break;
case INTERVAL_HOUR:
expression= interval.hour;
break;
case INTERVAL_MINUTE:
expression= interval.minute;
break;
case INTERVAL_SECOND:
expression= interval.second;
break;
case INTERVAL_YEAR_MONTH: // Allow YEAR-MONTH YYYYYMM
expression= interval.year* 12 + interval.month;
break;
case INTERVAL_DAY_HOUR:
expression= interval.day* 24 + interval.hour;
break;
case INTERVAL_DAY_MINUTE:
expression= (interval.day* 24 + interval.hour) * 60 + interval.minute;
break;
case INTERVAL_HOUR_SECOND: // day is anyway 0
case INTERVAL_DAY_SECOND:
/* DAY_SECOND having problems because of leap seconds? */
expression= ((interval.day* 24 + interval.hour) * 60 + interval.minute)*60
+ interval.second;
break;
case INTERVAL_MINUTE_MICROSECOND: // day and hour are 0
case INTERVAL_HOUR_MICROSECOND:// day is anyway 0
case INTERVAL_DAY_MICROSECOND:
expression= ((((interval.day*24) + interval.hour)*60+interval.minute)*60 +
interval.second) * 1000000L + interval.second_part;
break;
case INTERVAL_HOUR_MINUTE:
expression= interval.hour * 60 + interval.minute;
break;
case INTERVAL_MINUTE_SECOND:
expression= interval.minute * 60 + interval.second;
break;
case INTERVAL_SECOND_MICROSECOND:
expression= interval.second * 1000000L + interval.second_part;
break;
default:
break;
}
if (interval.neg || expression > EVEX_MAX_INTERVAL_VALUE)
DBUG_RETURN(EVEX_BAD_PARAMS);
this->interval= new_interval;
DBUG_RETURN(0);
}
/*
Set activation time.
SYNOPSIS
event_timed::init_starts()
expr how much?
interval what is the interval
NOTES
Note that activation time is not execution time.
EVERY 5 MINUTE STARTS "2004-12-12 10:00:00" means that
the event will be executed every 5 minutes but this will
start at the date shown above. Expressions are possible :
DATE_ADD(NOW(), INTERVAL 1 DAY) -- start tommorow at
same time.
RETURNS
0 - OK
EVEX_PARSE_ERROR - fix_fields failed
*/
int
event_timed::init_starts(THD *thd, Item *new_starts)
{
my_bool not_used;
TIME ltime, time_tmp;
DBUG_ENTER("event_timed::init_starts");
if (new_starts->fix_fields(thd, &new_starts))
DBUG_RETURN(EVEX_PARSE_ERROR);
if ((not_used= new_starts->get_date(&ltime, TIME_NO_ZERO_DATE)))
DBUG_RETURN(EVEX_BAD_PARAMS);
// let's check whether time is in the past
thd->variables.time_zone->gmt_sec_to_TIME(&time_tmp,
(my_time_t) thd->query_start());
DBUG_PRINT("info",("now =%lld", TIME_to_ulonglong_datetime(&time_tmp)));
DBUG_PRINT("info",("starts=%lld", TIME_to_ulonglong_datetime(&ltime)));
if (TIME_to_ulonglong_datetime(&ltime) <
TIME_to_ulonglong_datetime(&time_tmp))
DBUG_RETURN(EVEX_BAD_PARAMS);
/*
This may result in a 1970-01-01 date if ltime is > 2037-xx-xx
CONVERT_TZ has similar problem
*/
my_tz_UTC->gmt_sec_to_TIME(&ltime, TIME_to_timestamp(thd, &ltime, &not_used));
starts= ltime;
DBUG_RETURN(0);
}
/*
Set deactivation time.
SYNOPSIS
event_timed::init_ends()
thd THD
new_ends when?
NOTES
Note that activation time is not execution time.
EVERY 5 MINUTE ENDS "2004-12-12 10:00:00" means that
the event will be executed every 5 minutes but this will
end at the date shown above. Expressions are possible :
DATE_ADD(NOW(), INTERVAL 1 DAY) -- end tommorow at
same time.
RETURNS
0 - OK
EVEX_PARSE_ERROR - fix_fields failed
EVEX_BAD_PARAMS - ENDS before STARTS
*/
int
event_timed::init_ends(THD *thd, Item *new_ends)
{
TIME ltime;
my_time_t my_time_tmp;
my_bool not_used;
DBUG_ENTER("event_timed::init_ends");
if (new_ends->fix_fields(thd, &new_ends))
DBUG_RETURN(EVEX_PARSE_ERROR);
// the field was already fixed in init_ends
if ((not_used= new_ends->get_date(&ltime, TIME_NO_ZERO_DATE)))
DBUG_RETURN(EVEX_BAD_PARAMS);
/*
This may result in a 1970-01-01 date if ltime is > 2037-xx-xx
CONVERT_TZ has similar problem
*/
my_tz_UTC->gmt_sec_to_TIME(&ltime, TIME_to_timestamp(thd, &ltime, &not_used));
if (starts.year && my_time_compare(&starts, &ltime) != -1)
DBUG_RETURN(EVEX_BAD_PARAMS);
ends= ltime;
DBUG_RETURN(0);
}
/*
Sets comment.
SYNOPSIS
event_timed::init_comment()
thd THD - used for memory allocation
comment the string.
*/
void
event_timed::init_comment(THD *thd, LEX_STRING *set_comment)
{
DBUG_ENTER("event_timed::init_comment");
comment.str= strmake_root(thd->mem_root, set_comment->str,
comment.length= set_comment->length);
DBUG_VOID_RETURN;
}
/*
Inits definer (definer_user and definer_host) during
parsing.
SYNOPSIS
event_timed::init_definer()
*/
int
event_timed::init_definer(THD *thd)
{
DBUG_ENTER("event_timed::init_definer");
definer_user.str= strdup_root(thd->mem_root, thd->security_ctx->priv_user);
definer_user.length= strlen(thd->security_ctx->priv_user);
definer_host.str= strdup_root(thd->mem_root, thd->security_ctx->priv_host);
definer_host.length= strlen(thd->security_ctx->priv_host);
definer.length= definer_user.length + definer_host.length + 1;
definer.str= alloc_root(thd->mem_root, definer.length + 1);
memcpy(definer.str, definer_user.str, definer_user.length);
definer.str[definer_user.length]= '@';
memcpy(definer.str + definer_user.length + 1, definer_host.str,
definer_host.length);
definer.str[definer.length]= '\0';
DBUG_RETURN(0);
}
/*
Loads an event from a row from mysql.event
SYNOPSIS
event_timed::load_from_row(MEM_ROOT *mem_root, TABLE *table)
REMARKS
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.
*/
int
event_timed::load_from_row(MEM_ROOT *mem_root, TABLE *table)
{
longlong created;
longlong modified;
char *ptr;
event_timed *et;
uint len;
bool res1, res2;
DBUG_ENTER("event_timed::load_from_row");
if (!table)
goto error;
et= this;
if (table->s->fields != EVEX_FIELD_COUNT)
goto error;
if ((et->dbname.str= get_field(mem_root,
table->field[EVEX_FIELD_DB])) == NULL)
goto error;
et->dbname.length= strlen(et->dbname.str);
if ((et->name.str= get_field(mem_root,
table->field[EVEX_FIELD_NAME])) == NULL)
goto error;
et->name.length= strlen(et->name.str);
if ((et->body.str= get_field(mem_root,
table->field[EVEX_FIELD_BODY])) == NULL)
goto error;
et->body.length= strlen(et->body.str);
if ((et->definer.str= get_field(mem_root,
table->field[EVEX_FIELD_DEFINER])) == NullS)
goto error;
et->definer.length= strlen(et->definer.str);
ptr= strchr(et->definer.str, '@');
if (! ptr)
ptr= et->definer.str;
len= ptr - et->definer.str;
et->definer_user.str= strmake_root(mem_root, et->definer.str, len);
et->definer_user.length= len;
len= et->definer.length - len - 1; //1 is because of @
et->definer_host.str= strmake_root(mem_root, ptr + 1, len);//1: because of @
et->definer_host.length= len;
res1= table->field[EVEX_FIELD_STARTS]->
get_date(&et->starts, TIME_NO_ZERO_DATE);
res2= table->field[EVEX_FIELD_ENDS]->
get_date(&et->ends, TIME_NO_ZERO_DATE);
et->expression= table->field[EVEX_FIELD_INTERVAL_EXPR]->val_int();
/*
If res1 and res2 are true then both fields are empty.
Hence if EVEX_FIELD_EXECUTE_AT is empty there is an error.
*/
if (res1 && res2 && !et->expression && table->field[EVEX_FIELD_EXECUTE_AT]->
get_date(&et->execute_at, TIME_NO_ZERO_DATE))
goto error;
/*
In DB the values start from 1 but enum interval_type starts
from 0
*/
et->interval= (interval_type)
((ulonglong) table->field[EVEX_FIELD_TRANSIENT_INTERVAL]->val_int() - 1);
et->modified= table->field[EVEX_FIELD_CREATED]->val_int();
et->created= table->field[EVEX_FIELD_MODIFIED]->val_int();
/*
ToDo Andrey : Ask PeterG & Serg what to do in this case.
Whether on load last_executed_at should be loaded
or it must be 0ed. If last_executed_at is loaded
then an event can be scheduled for execution
instantly. Let's say an event has to be executed
every 15 mins. The server has been stopped for
more than this time and then started. If L_E_AT
is loaded from DB, execution at L_E_AT+15min
will be scheduled. However this time is in the past.
Hence immediate execution. Due to patch of
::mark_last_executed() last_executed gets time_now
and not execute_at. If not like this a big
queue can be scheduled for times which are still in
the past (2, 3 and more executions which will be
consequent).
*/
set_zero_time(&last_executed, MYSQL_TIMESTAMP_DATETIME);
#ifdef ANDREY_0
table->field[EVEX_FIELD_LAST_EXECUTED]->
get_date(&et->last_executed, TIME_NO_ZERO_DATE);
#endif
last_executed_changed= false;
// ToDo : Andrey . Find a way not to allocate ptr on event_mem_root
if ((ptr= get_field(mem_root, table->field[EVEX_FIELD_STATUS])) == NullS)
goto error;
DBUG_PRINT("load_from_row", ("Event [%s] is [%s]", et->name.str, ptr));
et->status= (ptr[0]=='E'? MYSQL_EVENT_ENABLED:MYSQL_EVENT_DISABLED);
// ToDo : Andrey . Find a way not to allocate ptr on event_mem_root
if ((ptr= get_field(mem_root,
table->field[EVEX_FIELD_ON_COMPLETION])) == NullS)
goto error;
et->on_completion= (ptr[0]=='D'? MYSQL_EVENT_ON_COMPLETION_DROP:
MYSQL_EVENT_ON_COMPLETION_PRESERVE);
et->comment.str= get_field(mem_root, table->field[EVEX_FIELD_COMMENT]);
if (et->comment.str != NullS)
et->comment.length= strlen(et->comment.str);
else
et->comment.length= 0;
DBUG_RETURN(0);
error:
DBUG_RETURN(EVEX_GET_FIELD_FAILED);
}
/*
Computes the sum of a timestamp plus interval
SYNOPSIS
get_next_time(TIME *start, int interval_value, interval_type interval)
next - the sum
start - add interval_value to this time
i_value - quantity of time type interval to add
i_type - type of interval to add (SECOND, MINUTE, HOUR, WEEK ...)
*/
static
bool get_next_time(TIME *next, TIME *start, int i_value, interval_type i_type)
{
bool ret;
INTERVAL interval;
TIME tmp;
bzero(&interval, sizeof(interval));
switch (i_type) {
case INTERVAL_YEAR:
interval.year= (ulong) i_value;
break;
case INTERVAL_QUARTER:
interval.month= (ulong)(i_value*3);
break;
case INTERVAL_YEAR_MONTH:
case INTERVAL_MONTH:
interval.month= (ulong) i_value;
break;
case INTERVAL_WEEK:
interval.day= (ulong)(i_value*7);
break;
case INTERVAL_DAY:
interval.day= (ulong) i_value;
break;
case INTERVAL_DAY_HOUR:
case INTERVAL_HOUR:
interval.hour= (ulong) i_value;
break;
case INTERVAL_DAY_MINUTE:
case INTERVAL_HOUR_MINUTE:
case INTERVAL_MINUTE:
interval.minute=i_value;
break;
case INTERVAL_DAY_SECOND:
case INTERVAL_HOUR_SECOND:
case INTERVAL_MINUTE_SECOND:
case INTERVAL_SECOND:
interval.second=i_value;
break;
case INTERVAL_DAY_MICROSECOND:
case INTERVAL_HOUR_MICROSECOND:
case INTERVAL_MINUTE_MICROSECOND:
case INTERVAL_SECOND_MICROSECOND:
case INTERVAL_MICROSECOND:
interval.second_part=i_value;
break;
}
tmp= *start;
if (!(ret= date_add_interval(&tmp, i_type, interval)))
*next= tmp;
return ret;
}
/*
Computes next execution time.
SYNOPSIS
event_timed::compute_next_execution_time()
REMARKS:
The time is set in execute_at, if no more executions the latter is set to
0000-00-00.
*/
bool
event_timed::compute_next_execution_time()
{
TIME time_now;
my_time_t now;
int tmp;
DBUG_ENTER("event_timed::compute_next_execution_time");
if (status == MYSQL_EVENT_DISABLED)
{
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.year)
{
DBUG_PRINT("compute_next_execution_time",
("One-time event %s was already executed", name.str));
if (on_completion == MYSQL_EVENT_ON_COMPLETION_DROP)
{
DBUG_PRINT("compute_next_execution_time",
("One-time event will be dropped."));
dropped= true;
}
status= MYSQL_EVENT_DISABLED;
status_changed= true;
}
goto ret;
}
time((time_t *)&now);
my_tz_UTC->gmt_sec_to_TIME(&time_now, now);
#ifdef ANDREY_0
sql_print_information("[%s.%s]", dbname.str, name.str);
sql_print_information("time_now : [%d-%d-%d %d:%d:%d ]",
time_now.year, time_now.month, time_now.day,
time_now.hour, time_now.minute, time_now.second);
sql_print_information("starts : [%d-%d-%d %d:%d:%d ]", starts.year,
starts.month, starts.day, starts.hour,
starts.minute, starts.second);
sql_print_information("ends : [%d-%d-%d %d:%d:%d ]", ends.year,
ends.month, ends.day, ends.hour,
ends.minute, ends.second);
sql_print_information("m_last_ex: [%d-%d-%d %d:%d:%d ]", last_executed.year,
last_executed.month, last_executed.day,
last_executed.hour, last_executed.minute,
last_executed.second);
#endif
//if time_now is after ends don't execute anymore
if (ends.year && (tmp= my_time_compare(&ends, &time_now)) == -1)
{
// time_now is after ends. don't execute anymore
set_zero_time(&execute_at, MYSQL_TIMESTAMP_DATETIME);
if (on_completion == MYSQL_EVENT_ON_COMPLETION_DROP)
dropped= true;
status= MYSQL_EVENT_DISABLED;
status_changed= true;
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.year && (tmp= my_time_compare(&time_now, &starts)) < 1)
{
if (tmp == 0 && my_time_compare(&starts, &last_executed) == 0)
{
/*
time_now = starts = last_executed
do nothing or we will schedule for second time execution at starts.
*/
}
else
{
/*
starts is in the future
time_now before starts. Scheduling for starts
*/
execute_at= starts;
goto ret;
}
}
if (starts.year && ends.year)
{
/*
Both starts and m_ends are set and time_now is between them (incl.)
If last_executed is set then increase with m_expression. The new TIME is
after m_ends set execute_at to 0. And check for on_completion
If not set then schedule for now.
*/
if (!last_executed.year)
execute_at= time_now;
else
{
TIME next_exec;
if (get_next_time(&next_exec, &last_executed, expression, interval))
goto err;
// There was previous execution
if (my_time_compare(&ends, &next_exec) == -1)
{
// Next execution after ends. No more executions
set_zero_time(&execute_at, MYSQL_TIMESTAMP_DATETIME);
if (on_completion == MYSQL_EVENT_ON_COMPLETION_DROP)
dropped= true;
}
else
execute_at= next_exec;
}
goto ret;
}
else if (!starts.year && !ends.year)
{
// both starts and m_ends are not set, se we schedule for the next
// based on last_executed
if (last_executed.year)
{
if (get_next_time(&execute_at, &last_executed, expression, interval))
goto err;
}
else
//last_executed not set. Schedule the event for now
execute_at= time_now;
}
else
{
//either starts or m_ends is set
if (starts.year)
{
/*
- starts is set.
- starts is not in the future according to check made before
Hence schedule for starts + m_expression in case last_executed
is not set, otherwise to last_executed + m_expression
*/
if (last_executed.year)
{
if (get_next_time(&execute_at, &last_executed, expression, interval))
goto err;
}
else
execute_at= starts;
}
else
{
/*
- m_ends is set
- m_ends is after time_now or is equal
Hence check for m_last_execute and increment with m_expression.
If last_executed is not set then schedule for now
*/
if (!last_executed.year)
execute_at= time_now;
else
{
TIME next_exec;
if (get_next_time(&next_exec, &last_executed, expression, interval))
goto err;
if (my_time_compare(&ends, &next_exec) == -1)
{
set_zero_time(&execute_at, MYSQL_TIMESTAMP_DATETIME);
if (on_completion == MYSQL_EVENT_ON_COMPLETION_DROP)
dropped= true;
}
else
execute_at= next_exec;
}
}
goto ret;
}
ret:
DBUG_RETURN(false);
err:
DBUG_RETURN(true);
}
/*
Set the internal last_executed TIME struct to now. NOW is the
time according to thd->query_start(), so the THD's clock.
Synopsis
event_timed::drop()
thd - thread context
*/
void
event_timed::mark_last_executed(THD *thd)
{
TIME time_now;
thd->end_time();
my_tz_UTC->gmt_sec_to_TIME(&time_now, (my_time_t) thd->query_start());
last_executed= time_now; // was execute_at
#ifdef ANDREY_0
last_executed= execute_at;
#endif
last_executed_changed= true;
}
/*
Drops the event
Synopsis
event_timed::drop()
thd - thread context
RETURNS :
0 - OK
-1 - Cannot open mysql.event
-2 - Cannot find the event in mysql.event (already deleted?)
others - return code from SE in case deletion of the event row
failed.
*/
int
event_timed::drop(THD *thd)
{
TABLE *table;
int ret= 0;
DBUG_ENTER("event_timed::drop");
if (evex_open_event_table(thd, TL_WRITE, &table))
DBUG_RETURN(-1);
if (evex_db_find_event_aux(thd, dbname, name, definer, table))
DBUG_RETURN(-2);
if ((ret= table->file->ha_delete_row(table->record[0])))
DBUG_RETURN(ret);
close_thread_tables(thd);
DBUG_RETURN(0);
}
/*
Saves status and last_executed_at to the disk if changed.
Synopsis
event_timed::drop()
thd - thread context
Returns :
0 - OK
SP_OPEN_TABLE_FAILED - Error while opening mysql.event for writing
EVEX_WRITE_ROW_FAILED - On error to write to disk
others - return code from SE in case deletion of the event row
failed.
*/
bool
event_timed::update_fields(THD *thd)
{
TABLE *table;
Open_tables_state backup;
int ret= 0;
bool opened;
DBUG_ENTER("event_timed::update_time_fields");
DBUG_PRINT("enter", ("name: %*s", name.length, name.str));
//no need to update if nothing has changed
if (!(status_changed || last_executed_changed))
goto done;
thd->reset_n_backup_open_tables_state(&backup);
if (evex_open_event_table(thd, TL_WRITE, &table))
{
ret= SP_OPEN_TABLE_FAILED;
goto done;
}
if ((ret= evex_db_find_event_aux(thd, dbname, name, definer, table)))
goto done;
store_record(table,record[1]);
// Don't update create on row update.
table->timestamp_field_type= TIMESTAMP_NO_AUTO_SET;
if (last_executed_changed)
{
table->field[EVEX_FIELD_LAST_EXECUTED]->set_notnull();
table->field[EVEX_FIELD_LAST_EXECUTED]->store_time(&last_executed,
MYSQL_TIMESTAMP_DATETIME);
last_executed_changed= false;
}
if (status_changed)
{
table->field[EVEX_FIELD_STATUS]->set_notnull();
table->field[EVEX_FIELD_STATUS]->store((longlong)status);
status_changed= false;
}
if ((table->file->ha_update_row(table->record[1],table->record[0])))
ret= EVEX_WRITE_ROW_FAILED;
done:
close_thread_tables(thd);
thd->restore_backup_open_tables_state(&backup);
DBUG_RETURN(ret);
}
/*
Get SHOW CREATE EVENT as string
thd - Thread
buf - String*, should be already allocated. CREATE EVENT goes inside.
Returns:
0 - OK
1 - Error (for now if mysql.event has been tampered and MICROSECONDS
interval or derivative has been put there.
*/
int
event_timed::get_create_event(THD *thd, String *buf)
{
int multipl= 0;
char tmp_buff[128];
String expr_buf(tmp_buff, sizeof(tmp_buff), system_charset_info);
expr_buf.length(0);
DBUG_ENTER("get_create_event");
DBUG_PRINT("ret_info",("body_len=[%d]body=[%s]", body.length, body.str));
if (expression &&
event_reconstruct_interval_expression(&expr_buf, interval, expression))
DBUG_RETURN(1);
buf->append(STRING_WITH_LEN("CREATE EVENT "));
append_identifier(thd, buf, dbname.str, dbname.length);
buf->append(STRING_WITH_LEN("."));
append_identifier(thd, buf, name.str, name.length);
buf->append(STRING_WITH_LEN(" ON SCHEDULE "));
if (expression)
{
buf->append(STRING_WITH_LEN("EVERY "));
buf->append(expr_buf);
}
else
{
char dtime_buff[20*2+32];// +32 to make my_snprintf_{8bit|ucs2} happy
buf->append(STRING_WITH_LEN("AT '"));
/*
pass the buffer and the second param tells fills the buffer and returns
the number of chars to copy
*/
buf->append(dtime_buff, my_datetime_to_str(&execute_at, dtime_buff));
buf->append(STRING_WITH_LEN("'"));
}
if (on_completion == MYSQL_EVENT_ON_COMPLETION_DROP)
buf->append(STRING_WITH_LEN(" ON COMPLETION NOT PRESERVE "));
else
buf->append(STRING_WITH_LEN(" ON COMPLETION PRESERVE "));
if (status == MYSQL_EVENT_ENABLED)
buf->append(STRING_WITH_LEN("ENABLE"));
else
buf->append(STRING_WITH_LEN("DISABLE"));
if (comment.length)
{
buf->append(STRING_WITH_LEN(" COMMENT "));
append_unescaped(buf, comment.str, comment.length);
}
buf->append(STRING_WITH_LEN(" DO "));
buf->append(body.str, body.length);
DBUG_RETURN(0);
}
/*
Executes the event (the underlying sp_head object);
SYNOPSIS
evex_fill_row()
thd THD
mem_root If != NULL use it to compile the event on it
Returns
0 - success
-100 - event in execution (parallel execution is impossible)
others - retcodes of sp_head::execute_procedure()
*/
int
event_timed::execute(THD *thd, MEM_ROOT *mem_root)
{
List<Item> empty_item_list;
int ret= 0;
DBUG_ENTER("event_timed::execute");
VOID(pthread_mutex_lock(&this->LOCK_running));
if (running)
{
VOID(pthread_mutex_unlock(&this->LOCK_running));
DBUG_RETURN(-100);
}
running= true;
VOID(pthread_mutex_unlock(&this->LOCK_running));
// TODO Andrey : make this as member variable and delete in destructor
empty_item_list.empty();
if (!sphead && (ret= compile(thd, mem_root)))
goto done;
ret= sphead->execute_procedure(thd, &empty_item_list);
VOID(pthread_mutex_lock(&this->LOCK_running));
running= false;
VOID(pthread_mutex_unlock(&this->LOCK_running));
done:
// Don't cache sphead if allocated on another mem_root
if (mem_root && sphead)
{
delete sphead;
sphead= 0;
}
DBUG_RETURN(ret);
}
/*
Compiles an event before it's execution. Compiles the anonymous
sp_head object held by the event
Synopsis
event_timed::compile()
thd - thread context, used for memory allocation mostly
mem_root - if != NULL then this memory root is used for allocs
instead of thd->mem_root
Returns
0 - Success
EVEX_COMPILE_ERROR - Error during compilation
*/
int
event_timed::compile(THD *thd, MEM_ROOT *mem_root)
{
int ret= 0;
MEM_ROOT *tmp_mem_root= 0;
LEX *old_lex= thd->lex, lex;
char *old_db;
event_timed *ett;
sp_name *spn;
char *old_query;
uint old_query_len;
st_sp_chistics *p;
char create_buf[2048];
String show_create(create_buf, sizeof(create_buf), system_charset_info);
CHARSET_INFO *old_character_set_client,
*old_collation_connection,
*old_character_set_results;
show_create.length(0);
old_character_set_client= thd->variables.character_set_client;
old_character_set_results= thd->variables.character_set_results;
old_collation_connection= thd->variables.collation_connection;
thd->variables.character_set_client=
thd->variables.character_set_results=
thd->variables.collation_connection=
get_charset_by_csname("utf8", MY_CS_PRIMARY, MYF(MY_WME));
thd->update_charset();
DBUG_ENTER("event_timed::compile");
// change the memory root for the execution time
if (mem_root)
{
tmp_mem_root= thd->mem_root;
thd->mem_root= mem_root;
}
old_query_len= thd->query_length;
old_query= thd->query;
old_db= thd->db;
thd->db= dbname.str;
get_create_event(thd, &show_create);
thd->query= show_create.c_ptr();
thd->query_length= show_create.length();
DBUG_PRINT("event_timed::compile", ("query:%s",thd->query));
thd->lex= &lex;
lex_start(thd, (uchar*)thd->query, thd->query_length);
lex.et_compile_phase= TRUE;
if (yyparse((void *)thd) || thd->is_fatal_error)
{
DBUG_PRINT("error", ("error during compile or thd->is_fatal_error=%d",
thd->is_fatal_error));
// Free lex associated resources
// QQ: Do we really need all this stuff here ?
sql_print_error("error during compile of %s.%s or thd->is_fatal_error=%d",
dbname.str, name.str, thd->is_fatal_error);
if (lex.sphead)
{
if (&lex != thd->lex)
thd->lex->sphead->restore_lex(thd);
delete lex.sphead;
lex.sphead= 0;
}
ret= EVEX_COMPILE_ERROR;
goto done;
}
DBUG_PRINT("note", ("success compiling %s.%s", dbname.str, name.str));
sphead= lex.et->sphead;
sphead->m_db= dbname;
//copy also chistics since they will vanish otherwise we get 0x0 pointer
// Todo : Handle sql_mode !!
sphead->set_definer(definer.str, definer.length);
sphead->set_info(0, 0, &lex.sp_chistics, 0/*sql_mode*/);
sphead->optimize();
ret= 0;
done:
lex.et->free_sphead_on_delete= false;
delete lex.et;
lex_end(&lex);
DBUG_PRINT("note", ("return old data on its place. set back NAMES"));
thd->lex= old_lex;
thd->query= old_query;
thd->query_length= old_query_len;
thd->db= old_db;
thd->variables.character_set_client= old_character_set_client;
thd->variables.character_set_results= old_character_set_results;
thd->variables.collation_connection= old_collation_connection;
thd->update_charset();
/*
Change the memory root for the execution time.
*/
if (mem_root)
thd->mem_root= tmp_mem_root;
DBUG_RETURN(ret);
}
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