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mariadb/sql/event_data_objects.cc
kostja@bodhi.local b42b416400 Remove unnecessary casts to uchar. The casts are stemming from 
the lexer API which internally uses  unsigned char variables to
address its state map. The implementation of the lexer should be
internal to the lexer, and not influence the rest of the code.
2007-03-27 21:09:56 +04:00

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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 */
#define MYSQL_LEX 1
#include "mysql_priv.h"
#include "events.h"
#include "event_data_objects.h"
#include "event_db_repository.h"
#include "sp_head.h"
/* That's a provisional solution */
extern Event_db_repository events_event_db_repository;
#define EVEX_MAX_INTERVAL_VALUE 1000000000L
static bool
event_change_security_context(THD *thd, LEX_STRING user, LEX_STRING host,
LEX_STRING db, Security_context *backup);
static void
event_restore_security_context(THD *thd, Security_context *backup);
/*
Initiliazes 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(LEX_STRING db, LEX_STRING n)
{
if (!(dbname.str= my_strndup(db.str, dbname.length= db.length, MYF(MY_WME))))
return TRUE;
if (!(name.str= my_strndup(n.str, name.length= n.length, MYF(MY_WME))))
{
my_free((gptr) dbname.str, MYF(0));
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((gptr) dbname.str, MYF(0));
my_free((gptr) name.str, MYF(0));
}
/*
Returns a new instance
SYNOPSIS
Event_parse_data::new_instance()
RETURN VALUE
Address or NULL in case of error
NOTE
Created on THD's mem_root
*/
Event_parse_data *
Event_parse_data::new_instance(THD *thd)
{
return new (thd->mem_root) Event_parse_data;
}
/*
Constructor
SYNOPSIS
Event_parse_data::Event_parse_data()
*/
Event_parse_data::Event_parse_data()
:on_completion(ON_COMPLETION_DROP), status(ENABLED), do_not_create(FALSE),
item_starts(NULL), item_ends(NULL), item_execute_at(NULL),
starts_null(TRUE), ends_null(TRUE), execute_at_null(TRUE),
item_expression(NULL), expression(0)
{
DBUG_ENTER("Event_parse_data::Event_parse_data");
/* Actually in the parser STARTS is always set */
starts= ends= execute_at= 0;
body.str= comment.str= NULL;
body.length= comment.length= 0;
DBUG_VOID_RETURN;
}
/*
Set a name of the event
SYNOPSIS
Event_parse_data::init_name()
thd THD
spn the name extracted in the parser
*/
void
Event_parse_data::init_name(THD *thd, sp_name *spn)
{
DBUG_ENTER("Event_parse_data::init_name");
/* We have to copy strings to get them into the right memroot */
dbname.length= spn->m_db.length;
dbname.str= thd->strmake(spn->m_db.str, spn->m_db.length);
name.length= spn->m_name.length;
name.str= thd->strmake(spn->m_name.str, spn->m_name.length);
if (spn->m_qname.length == 0)
spn->init_qname(thd);
DBUG_VOID_RETURN;
}
/*
Set body of the event - what should be executed.
SYNOPSIS
Event_parse_data::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.
Some questionable removal of characters is done in here, and that part
should be refactored when the parser is smarter.
*/
void
Event_parse_data::init_body(THD *thd)
{
DBUG_ENTER("Event_parse_data::init_body");
DBUG_PRINT("info", ("body: '%s' body_begin: 0x%lx end: 0x%lx", body_begin,
(long) body_begin, (long) thd->lex->ptr));
body.length= thd->lex->ptr - body_begin;
const char *body_end= body_begin + body.length - 1;
/* Trim nuls or close-comments ('*'+'/') or spaces at the end */
while (body_begin < body_end)
{
if ((*body_end == '\0') ||
(my_isspace(thd->variables.character_set_client, *body_end)))
{ /* consume NULs and meaningless whitespace */
--body.length;
--body_end;
continue;
}
/*
consume closing comments
This is arguably wrong, but it's the best we have until the parser is
changed to be smarter. FIXME PARSER
See also the sp_head code, where something like this is done also.
One idea is to keep in the lexer structure the count of the number of
open-comments we've entered, and scan left-to-right looking for a
closing comment IFF the count is greater than zero.
Another idea is to remove the closing comment-characters wholly in the
parser, since that's where it "removes" the opening characters.
*/
if ((*(body_end - 1) == '*') && (*body_end == '/'))
{
DBUG_PRINT("info", ("consumend one '*" "/' comment in the query '%s'",
body_begin));
body.length-= 2;
body_end-= 2;
continue;
}
break; /* none were found, so we have excised all we can. */
}
/* the first is always whitespace which I cannot skip in the parser */
while (my_isspace(thd->variables.character_set_client, *body_begin))
{
++body_begin;
--body.length;
}
body.str= thd->strmake((char *)body_begin, body.length);
DBUG_VOID_RETURN;
}
/*
This function is called on CREATE EVENT or ALTER EVENT. When either
ENDS or AT is in the past, we are trying to create an event that
will never be executed. If it has ON COMPLETION NOT PRESERVE
(default), then it would normally be dropped already, so on CREATE
EVENT we give a warning, and do not create anyting. On ALTER EVENT
we give a error, and do not change the event.
If the event has ON COMPLETION PRESERVE, then we see if the event is
created or altered to the ENABLED (default) state. If so, then we
give a warning, and change the state to DISABLED.
Otherwise it is a valid event in ON COMPLETION PRESERVE DISABLE
state.
*/
void
Event_parse_data::check_if_in_the_past(THD *thd, my_time_t ltime_utc)
{
if (ltime_utc >= (my_time_t) thd->query_start())
return;
if (on_completion == ON_COMPLETION_DROP)
{
switch (thd->lex->sql_command) {
case SQLCOM_CREATE_EVENT:
push_warning(thd, MYSQL_ERROR::WARN_LEVEL_NOTE,
ER_EVENT_CANNOT_CREATE_IN_THE_PAST,
ER(ER_EVENT_CANNOT_CREATE_IN_THE_PAST));
break;
case SQLCOM_ALTER_EVENT:
my_error(ER_EVENT_CANNOT_ALTER_IN_THE_PAST, MYF(0));
break;
default:
DBUG_ASSERT(0);
}
do_not_create= TRUE;
}
else if (status == ENABLED)
{
status= DISABLED;
push_warning(thd, MYSQL_ERROR::WARN_LEVEL_NOTE,
ER_EVENT_EXEC_TIME_IN_THE_PAST,
ER(ER_EVENT_EXEC_TIME_IN_THE_PAST));
}
}
/*
Sets time for execution for one-time event.
SYNOPSIS
Event_parse_data::init_execute_at()
thd Thread
RETURN VALUE
0 OK
ER_WRONG_VALUE Wrong value for execute at (reported)
*/
int
Event_parse_data::init_execute_at(THD *thd)
{
my_bool not_used;
TIME ltime;
my_time_t ltime_utc;
DBUG_ENTER("Event_parse_data::init_execute_at");
if (!item_execute_at)
DBUG_RETURN(0);
if (item_execute_at->fix_fields(thd, &item_execute_at))
goto wrong_value;
/* no starts and/or ends in case of execute_at */
DBUG_PRINT("info", ("starts_null && ends_null should be 1 is %d",
(starts_null && ends_null)));
DBUG_ASSERT(starts_null && ends_null);
if ((not_used= item_execute_at->get_date(&ltime, TIME_NO_ZERO_DATE)))
goto wrong_value;
ltime_utc= TIME_to_timestamp(thd,&ltime,&not_used);
if (!ltime_utc)
{
DBUG_PRINT("error", ("Execute AT after year 2037"));
goto wrong_value;
}
check_if_in_the_past(thd, ltime_utc);
execute_at_null= FALSE;
execute_at= ltime_utc;
DBUG_RETURN(0);
wrong_value:
report_bad_value("AT", item_execute_at);
DBUG_RETURN(ER_WRONG_VALUE);
}
/*
Sets time for execution of multi-time event.s
SYNOPSIS
Event_parse_data::init_interval()
thd Thread
RETURN VALUE
0 OK
EVEX_BAD_PARAMS Interval is not positive or MICROSECOND (reported)
ER_WRONG_VALUE Wrong value for interval (reported)
*/
int
Event_parse_data::init_interval(THD *thd)
{
String value;
INTERVAL interval_tmp;
DBUG_ENTER("Event_parse_data::init_interval");
if (!item_expression)
DBUG_RETURN(0);
switch (interval) {
case INTERVAL_MINUTE_MICROSECOND:
case INTERVAL_HOUR_MICROSECOND:
case INTERVAL_DAY_MICROSECOND:
case INTERVAL_SECOND_MICROSECOND:
case INTERVAL_MICROSECOND:
my_error(ER_NOT_SUPPORTED_YET, MYF(0), "MICROSECOND");
DBUG_RETURN(EVEX_BAD_PARAMS);
default:
break;
}
if (item_expression->fix_fields(thd, &item_expression))
goto wrong_value;
value.alloc(MAX_DATETIME_FULL_WIDTH*MY_CHARSET_BIN_MB_MAXLEN);
if (get_interval_value(item_expression, interval, &value, &interval_tmp))
goto wrong_value;
expression= 0;
switch (interval) {
case INTERVAL_YEAR:
expression= interval_tmp.year;
break;
case INTERVAL_QUARTER:
case INTERVAL_MONTH:
expression= interval_tmp.month;
break;
case INTERVAL_WEEK:
case INTERVAL_DAY:
expression= interval_tmp.day;
break;
case INTERVAL_HOUR:
expression= interval_tmp.hour;
break;
case INTERVAL_MINUTE:
expression= interval_tmp.minute;
break;
case INTERVAL_SECOND:
expression= interval_tmp.second;
break;
case INTERVAL_YEAR_MONTH: // Allow YEAR-MONTH YYYYYMM
expression= interval_tmp.year* 12 + interval_tmp.month;
break;
case INTERVAL_DAY_HOUR:
expression= interval_tmp.day* 24 + interval_tmp.hour;
break;
case INTERVAL_DAY_MINUTE:
expression= (interval_tmp.day* 24 + interval_tmp.hour) * 60 +
interval_tmp.minute;
break;
case INTERVAL_HOUR_SECOND: /* day is anyway 0 */
case INTERVAL_DAY_SECOND:
/* DAY_SECOND having problems because of leap seconds? */
expression= ((interval_tmp.day* 24 + interval_tmp.hour) * 60 +
interval_tmp.minute)*60
+ interval_tmp.second;
break;
case INTERVAL_HOUR_MINUTE:
expression= interval_tmp.hour * 60 + interval_tmp.minute;
break;
case INTERVAL_MINUTE_SECOND:
expression= interval_tmp.minute * 60 + interval_tmp.second;
break;
case INTERVAL_LAST:
DBUG_ASSERT(0);
default:
;/* these are the microsec stuff */
}
if (interval_tmp.neg || expression > EVEX_MAX_INTERVAL_VALUE)
{
my_error(ER_EVENT_INTERVAL_NOT_POSITIVE_OR_TOO_BIG, MYF(0));
DBUG_RETURN(EVEX_BAD_PARAMS);
}
DBUG_RETURN(0);
wrong_value:
report_bad_value("INTERVAL", item_expression);
DBUG_RETURN(ER_WRONG_VALUE);
}
/*
Sets STARTS.
SYNOPSIS
Event_parse_data::init_starts()
expr how much?
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.
RETURN VALUE
0 OK
ER_WRONG_VALUE Starts before now
*/
int
Event_parse_data::init_starts(THD *thd)
{
my_bool not_used;
TIME ltime;
my_time_t ltime_utc;
DBUG_ENTER("Event_parse_data::init_starts");
if (!item_starts)
DBUG_RETURN(0);
if (item_starts->fix_fields(thd, &item_starts))
goto wrong_value;
if ((not_used= item_starts->get_date(&ltime, TIME_NO_ZERO_DATE)))
goto wrong_value;
ltime_utc= TIME_to_timestamp(thd, &ltime, &not_used);
if (!ltime_utc)
goto wrong_value;
DBUG_PRINT("info",("now: %ld starts: %ld",
(long) thd->query_start(), (long) ltime_utc));
starts_null= FALSE;
starts= ltime_utc;
DBUG_RETURN(0);
wrong_value:
report_bad_value("STARTS", item_starts);
DBUG_RETURN(ER_WRONG_VALUE);
}
/*
Sets ENDS (deactivation time).
SYNOPSIS
Event_parse_data::init_ends()
thd THD
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.
RETURN VALUE
0 OK
EVEX_BAD_PARAMS Error (reported)
*/
int
Event_parse_data::init_ends(THD *thd)
{
my_bool not_used;
TIME ltime;
my_time_t ltime_utc;
DBUG_ENTER("Event_parse_data::init_ends");
if (!item_ends)
DBUG_RETURN(0);
if (item_ends->fix_fields(thd, &item_ends))
goto error_bad_params;
DBUG_PRINT("info", ("convert to TIME"));
if ((not_used= item_ends->get_date(&ltime, TIME_NO_ZERO_DATE)))
goto error_bad_params;
ltime_utc= TIME_to_timestamp(thd, &ltime, &not_used);
if (!ltime_utc)
goto error_bad_params;
/* Check whether ends is after starts */
DBUG_PRINT("info", ("ENDS after STARTS?"));
if (!starts_null && starts >= ltime_utc)
goto error_bad_params;
check_if_in_the_past(thd, ltime_utc);
ends_null= FALSE;
ends= ltime_utc;
DBUG_RETURN(0);
error_bad_params:
my_error(ER_EVENT_ENDS_BEFORE_STARTS, MYF(0));
DBUG_RETURN(EVEX_BAD_PARAMS);
}
/*
Prints an error message about invalid value. Internally used
during input data verification
SYNOPSIS
Event_parse_data::report_bad_value()
item_name The name of the parameter
bad_item The parameter
*/
void
Event_parse_data::report_bad_value(const char *item_name, Item *bad_item)
{
char buff[120];
String str(buff,(uint32) sizeof(buff), system_charset_info);
String *str2= bad_item->fixed? bad_item->val_str(&str):NULL;
my_error(ER_WRONG_VALUE, MYF(0), item_name, str2? str2->c_ptr_safe():"NULL");
}
/*
Checks for validity the data gathered during the parsing phase.
SYNOPSIS
Event_parse_data::check_parse_data()
thd Thread
RETURN VALUE
FALSE OK
TRUE Error (reported)
*/
bool
Event_parse_data::check_parse_data(THD *thd)
{
bool ret;
DBUG_ENTER("Event_parse_data::check_parse_data");
DBUG_PRINT("info", ("execute_at: 0x%lx expr=0x%lx starts=0x%lx ends=0x%lx",
(long) item_execute_at, (long) item_expression,
(long) item_starts, (long) item_ends));
init_name(thd, identifier);
init_definer(thd);
ret= init_execute_at(thd) || init_interval(thd) || init_starts(thd) ||
init_ends(thd);
DBUG_RETURN(ret);
}
/*
Inits definer (definer_user and definer_host) during parsing.
SYNOPSIS
Event_parse_data::init_definer()
thd Thread
*/
void
Event_parse_data::init_definer(THD *thd)
{
DBUG_ENTER("Event_parse_data::init_definer");
DBUG_ASSERT(thd->lex->definer);
const char *definer_user= thd->lex->definer->user.str;
const char *definer_host= thd->lex->definer->host.str;
int definer_user_len= thd->lex->definer->user.length;
int definer_host_len= thd->lex->definer->host.length;
DBUG_PRINT("info",("init definer_user thd->mem_root: 0x%lx "
"definer_user: 0x%lx", (long) thd->mem_root,
(long) definer_user));
/* + 1 for @ */
DBUG_PRINT("info",("init definer as whole"));
definer.length= definer_user_len + definer_host_len + 1;
definer.str= thd->alloc(definer.length + 1);
DBUG_PRINT("info",("copy the user"));
memcpy(definer.str, definer_user, definer_user_len);
definer.str[definer_user_len]= '@';
DBUG_PRINT("info",("copy the host"));
memcpy(definer.str + definer_user_len + 1, definer_host, definer_host_len);
definer.str[definer.length]= '\0';
DBUG_PRINT("info",("definer [%s] initted", definer.str));
DBUG_VOID_RETURN;
}
/*
Constructor
SYNOPSIS
Event_basic::Event_basic()
*/
Event_basic::Event_basic()
{
DBUG_ENTER("Event_basic::Event_basic");
/* init memory root */
init_alloc_root(&mem_root, 256, 512);
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_STRING
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_STRING *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_STRING *);
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_STRING tz_name)
{
String str(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():
status_changed(FALSE), last_executed_changed(FALSE),
on_completion(ON_COMPLETION_DROP), status(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()
{
}
/*
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()
{
}
/*
Constructor
SYNOPSIS
Event_job_data::Event_job_data()
*/
Event_job_data::Event_job_data()
:sphead(NULL), sql_mode(0)
{
}
/*
Destructor
SYNOPSIS
Event_timed::~Event_timed()
*/
Event_job_data::~Event_job_data()
{
DBUG_ENTER("Event_job_data::~Event_job_data");
delete sphead;
sphead= NULL;
DBUG_VOID_RETURN;
}
/*
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;
}
/*
Loads an event's body from a row from mysql.event
SYNOPSIS
Event_job_data::load_from_row(THD *thd, TABLE *table)
RETURN VALUE
0 OK
EVEX_GET_FIELD_FAILED Error
NOTES
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_job_data::load_from_row(THD *thd, TABLE *table)
{
char *ptr;
uint len;
DBUG_ENTER("Event_job_data::load_from_row");
if (!table)
goto error;
if (table->s->fields != ET_FIELD_COUNT)
goto error;
LEX_STRING tz_name;
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);
if (load_time_zone(thd, tz_name))
goto error;
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= (ulong) table->field[ET_FIELD_SQL_MODE]->val_int();
DBUG_RETURN(0);
error:
DBUG_RETURN(EVEX_GET_FIELD_FAILED);
}
/*
Loads an event from a row from mysql.event
SYNOPSIS
Event_queue_element::load_from_row(THD *thd, TABLE *table)
RETURN VALUE
0 OK
EVEX_GET_FIELD_FAILED Error
NOTES
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_queue_element::load_from_row(THD *thd, TABLE *table)
{
char *ptr;
TIME time;
DBUG_ENTER("Event_queue_element::load_from_row");
if (!table)
goto error;
if (table->s->fields != ET_FIELD_COUNT)
goto error;
LEX_STRING tz_name;
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);
if (load_time_zone(thd, tz_name))
goto error;
starts_null= table->field[ET_FIELD_STARTS]->is_null();
if (!starts_null)
{
table->field[ET_FIELD_STARTS]->get_date(&time, TIME_NO_ZERO_DATE);
starts= sec_since_epoch_TIME(&time);
}
ends_null= table->field[ET_FIELD_ENDS]->is_null();
if (!ends_null)
{
table->field[ET_FIELD_ENDS]->get_date(&time, TIME_NO_ZERO_DATE);
ends= sec_since_epoch_TIME(&time);
}
if (!table->field[ET_FIELD_INTERVAL_EXPR]->is_null())
expression= table->field[ET_FIELD_INTERVAL_EXPR]->val_int();
else
expression= 0;
/*
If neigher 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))
goto error;
execute_at= sec_since_epoch_TIME(&time);
}
/*
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_STRING tmp;
table->field[ET_FIELD_TRANSIENT_INTERVAL]->val_str(&str);
if (!(tmp.length= str.length()))
goto error;
tmp.str= str.c_ptr_safe();
i= find_string_in_array(interval_type_to_name, &tmp, system_charset_info);
if (i < 0)
goto error;
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);
last_executed= sec_since_epoch_TIME(&time);
}
last_executed_changed= FALSE;
if ((ptr= get_field(&mem_root, table->field[ET_FIELD_STATUS])) == NullS)
goto error;
DBUG_PRINT("load_from_row", ("Event [%s] is [%s]", name.str, ptr));
status= (ptr[0]=='E'? Event_queue_element::ENABLED:
Event_queue_element::DISABLED);
/* 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)
goto error;
on_completion= (ptr[0]=='D'? Event_queue_element::ON_COMPLETION_DROP:
Event_queue_element::ON_COMPLETION_PRESERVE);
DBUG_RETURN(0);
error:
DBUG_RETURN(EVEX_GET_FIELD_FAILED);
}
/*
Loads an event from a row from mysql.event
SYNOPSIS
Event_timed::load_from_row(THD *thd, TABLE *table)
RETURN VALUE
0 OK
EVEX_GET_FIELD_FAILED Error
NOTES
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(THD *thd, TABLE *table)
{
char *ptr;
uint len;
DBUG_ENTER("Event_timed::load_from_row");
if (Event_queue_element::load_from_row(thd, table))
goto error;
load_string_fields(table->field, ET_FIELD_BODY, &body, ET_FIELD_COUNT);
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= (ulong) table->field[ET_FIELD_SQL_MODE]->val_int();
DBUG_RETURN(0);
error:
DBUG_RETURN(EVEX_GET_FIELD_FAILED);
}
/*
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(TIME *ltime, const Time_zone *time_zone,
interval_type scale, INTERVAL interval)
{
if (date_add_interval(ltime, scale, interval))
return 0;
my_bool not_used;
return time_zone->TIME_to_gmt_sec(ltime, &not_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);
break;
case INTERVAL_LAST:
DBUG_ASSERT(0);
}
DBUG_PRINT("info", ("seconds: %ld months: %ld", (long) seconds, (long) months));
TIME local_start;
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)
{
longlong seconds_diff;
long microsec_diff;
bool negative= calc_time_diff(&local_now, &local_start, 1,
&seconds_diff, &microsec_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 - local_start.year)*12 +
(local_now.month - 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: 0x%lx",
(long) starts, (long) ends, (long) last_executed,
(long) this));
if (status == Event_queue_element::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)
{
DBUG_PRINT("info",("One-time event %s.%s of was already executed",
dbname.str, name.str));
dropped= (on_completion == Event_queue_element::ON_COMPLETION_DROP);
DBUG_PRINT("info",("One-time event will be dropped: %d.", dropped));
status= Event_queue_element::DISABLED;
status_changed= TRUE;
}
goto ret;
}
time_now= (my_time_t) 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_queue_element::ON_COMPLETION_DROP)
dropped= TRUE;
DBUG_PRINT("info", ("Dropped: %d", dropped));
status= Event_queue_element::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_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
time_now before starts. Scheduling for starts
*/
execute_at= starts;
execute_at_null= FALSE;
goto ret;
}
}
if (!starts_null && !ends_null)
{
/*
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.
*/
DBUG_PRINT("info", ("Both STARTS & ENDS are set"));
if (!last_executed)
{
DBUG_PRINT("info", ("Not executed so far."));
}
{
my_time_t next_exec;
if (get_next_time(time_zone, &next_exec, starts, time_now,
(int) expression, interval))
goto err;
/* There was previous execution */
if (ends < next_exec)
{
DBUG_PRINT("info", ("Next execution of %s after ENDS. Stop executing.",
name.str));
/* Next execution after ends. No more executions */
execute_at= 0;
execute_at_null= TRUE;
if (on_completion == Event_queue_element::ON_COMPLETION_DROP)
dropped= TRUE;
status= Event_queue_element::DISABLED;
status_changed= TRUE;
}
else
{
DBUG_PRINT("info",("Next[%lu]", (ulong) next_exec));
execute_at= next_exec;
execute_at_null= FALSE;
}
}
goto ret;
}
else if (starts_null && ends_null)
{
/* starts is always set, so this is a dead branch !! */
DBUG_PRINT("info", ("Neither STARTS nor ENDS are set"));
/*
Both starts and m_ends are not set, so we schedule for the next
based on last_executed.
*/
if (last_executed)
{
my_time_t next_exec;
if (get_next_time(time_zone, &next_exec, starts, time_now,
(int) expression, interval))
goto err;
execute_at= next_exec;
DBUG_PRINT("info",("Next[%lu]", (ulong) next_exec));
}
else
{
/* last_executed not set. Schedule the event for now */
DBUG_PRINT("info", ("Execute NOW"));
execute_at= time_now;
}
execute_at_null= FALSE;
}
else
{
/* either starts or m_ends is set */
if (!starts_null)
{
DBUG_PRINT("info", ("STARTS is set"));
/*
- 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)
{
DBUG_PRINT("info", ("Not executed so far."));
}
{
my_time_t next_exec;
if (get_next_time(time_zone, &next_exec, starts, time_now,
(int) expression, interval))
goto err;
execute_at= next_exec;
DBUG_PRINT("info",("Next[%lu]", (ulong) next_exec));
}
execute_at_null= FALSE;
}
else
{
/* this is a dead branch, because starts is always set !!! */
DBUG_PRINT("info", ("STARTS is not set. ENDS is set"));
/*
- 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)
execute_at= time_now;
else
{
my_time_t next_exec;
if (get_next_time(time_zone, &next_exec, starts, time_now,
(int) expression, interval))
goto err;
if (ends < next_exec)
{
DBUG_PRINT("info", ("Next execution after ENDS. Stop executing."));
execute_at= 0;
execute_at_null= TRUE;
status= Event_queue_element::DISABLED;
status_changed= TRUE;
if (on_completion == Event_queue_element::ON_COMPLETION_DROP)
dropped= TRUE;
}
else
{
DBUG_PRINT("info", ("Next[%lu]", (ulong) next_exec));
execute_at= next_exec;
execute_at_null= FALSE;
}
}
}
goto ret;
}
ret:
DBUG_PRINT("info", ("ret: 0 execute_at: %lu", (long) execute_at));
DBUG_RETURN(FALSE);
err:
DBUG_PRINT("info", ("ret=1"));
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_queue_element::mark_last_executed()
thd thread context
*/
void
Event_queue_element::mark_last_executed(THD *thd)
{
thd->end_time();
last_executed= (my_time_t) thd->query_start();
last_executed_changed= TRUE;
execution_count++;
}
/*
Saves status and last_executed_at to the disk if changed.
SYNOPSIS
Event_queue_element::update_timing_fields()
thd - thread context
RETURN VALUE
FALSE OK
TRUE Error while opening mysql.event for writing or during
write on disk
*/
bool
Event_queue_element::update_timing_fields(THD *thd)
{
TABLE *table;
Field **fields;
Open_tables_state backup;
int ret= FALSE;
DBUG_ENTER("Event_queue_element::update_timing_fields");
DBUG_PRINT("enter", ("name: %*s", name.length, name.str));
/* No need to update if nothing has changed */
if (!(status_changed || last_executed_changed))
DBUG_RETURN(0);
thd->reset_n_backup_open_tables_state(&backup);
if (events_event_db_repository.open_event_table(thd, TL_WRITE, &table))
{
ret= TRUE;
goto done;
}
fields= table->field;
if ((ret= events_event_db_repository.
find_named_event(thd, dbname, name, 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)
{
TIME time;
my_tz_UTC->gmt_sec_to_TIME(&time, last_executed);
fields[ET_FIELD_LAST_EXECUTED]->set_notnull();
fields[ET_FIELD_LAST_EXECUTED]->store_time(&time,
MYSQL_TIMESTAMP_DATETIME);
last_executed_changed= FALSE;
}
if (status_changed)
{
fields[ET_FIELD_STATUS]->set_notnull();
fields[ET_FIELD_STATUS]->store((longlong)status, TRUE);
status_changed= FALSE;
}
if ((table->file->ha_update_row(table->record[1], table->record[0])))
ret= TRUE;
done:
close_thread_tables(thd);
thd->restore_backup_open_tables_state(&backup);
DBUG_RETURN(ret);
}
static
void
append_datetime(String *buf, Time_zone *time_zone, my_time_t secs,
const char *name, uint len)
{
char dtime_buff[20*2+32];/* +32 to make my_snprintf_{8bit|ucs2} happy */
buf->append(STRING_WITH_LEN(" "));
buf->append(name, len);
buf->append(STRING_WITH_LEN(" '"));
/*
Pass the buffer and the second param tells fills the buffer and
returns the number of chars to copy.
*/
TIME time;
time_zone->gmt_sec_to_TIME(&time, secs);
buf->append(dtime_buff, my_datetime_to_str(&time, dtime_buff));
buf->append(STRING_WITH_LEN("'"));
}
/*
Get SHOW CREATE EVENT as string
SYNOPSIS
Event_timed::get_create_event(THD *thd, String *buf)
thd Thread
buf String*, should be already allocated. CREATE EVENT goes inside.
RETURN VALUE
0 OK
EVEX_MICROSECOND_UNSUP 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)
{
char tmp_buf[2 * STRING_BUFFER_USUAL_SIZE];
String expr_buf(tmp_buf, sizeof(tmp_buf), 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 && Events::reconstruct_interval_expression(&expr_buf, interval,
expression))
DBUG_RETURN(EVEX_MICROSECOND_UNSUP);
buf->append(STRING_WITH_LEN("CREATE EVENT "));
append_identifier(thd, buf, name.str, name.length);
if (expression)
{
buf->append(STRING_WITH_LEN(" ON SCHEDULE EVERY "));
buf->append(expr_buf);
buf->append(' ');
LEX_STRING *ival= &interval_type_to_name[interval];
buf->append(ival->str, ival->length);
if (!starts_null)
append_datetime(buf, time_zone, starts, STRING_WITH_LEN("STARTS"));
if (!ends_null)
append_datetime(buf, time_zone, ends, STRING_WITH_LEN("ENDS"));
}
else
{
append_datetime(buf, time_zone, execute_at,
STRING_WITH_LEN("ON SCHEDULE AT"));
}
if (on_completion == Event_timed::ON_COMPLETION_DROP)
buf->append(STRING_WITH_LEN(" ON COMPLETION NOT PRESERVE "));
else
buf->append(STRING_WITH_LEN(" ON COMPLETION PRESERVE "));
if (status == Event_timed::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);
}
/*
Get SHOW CREATE EVENT as string
SYNOPSIS
Event_job_data::get_create_event(THD *thd, String *buf)
thd Thread
buf String*, should be already allocated. CREATE EVENT goes inside.
RETURN VALUE
0 OK
EVEX_MICROSECOND_UNSUP Error (for now if mysql.event has been
tampered and MICROSECONDS interval or
derivative has been put there.
*/
int
Event_job_data::get_fake_create_event(String *buf)
{
DBUG_ENTER("Event_job_data::get_create_event");
/* FIXME: "EVERY 3337 HOUR" is asking for trouble. */
buf->append(STRING_WITH_LEN("CREATE EVENT anonymous ON SCHEDULE "
"EVERY 3337 HOUR DO "));
buf->append(body.str, body.length);
DBUG_RETURN(0);
}
/*
Executes the event (the underlying sp_head object);
SYNOPSIS
Event_job_data::execute()
thd THD
RETURN VALUE
0 success
-99 No rights on this.dbname.str
others retcodes of sp_head::execute_procedure()
*/
int
Event_job_data::execute(THD *thd)
{
Security_context save_ctx;
/* this one is local and not needed after exec */
int ret= 0;
DBUG_ENTER("Event_job_data::execute");
DBUG_PRINT("info", ("EXECUTING %s.%s", dbname.str, name.str));
if ((ret= compile(thd, NULL)))
goto done;
event_change_security_context(thd, definer_user, definer_host, dbname,
&save_ctx);
/*
THD::~THD will clean this or if there is DROP DATABASE in the
SP then it will be free there. It should not point to our buffer
which is allocated on a mem_root.
*/
thd->db= my_strdup(dbname.str, MYF(0));
thd->db_length= dbname.length;
if (!check_access(thd, EVENT_ACL,dbname.str, 0, 0, 0,is_schema_db(dbname.str)))
{
List<Item> empty_item_list;
empty_item_list.empty();
if (thd->enable_slow_log)
sphead->m_flags|= sp_head::LOG_SLOW_STATEMENTS;
sphead->m_flags|= sp_head::LOG_GENERAL_LOG;
/* Execute the event in its time zone. */
thd->variables.time_zone= time_zone;
ret= sphead->execute_procedure(thd, &empty_item_list);
}
else
{
DBUG_PRINT("error", ("%s@%s has no rights on %s", definer_user.str,
definer_host.str, dbname.str));
ret= -99;
}
event_restore_security_context(thd, &save_ctx);
done:
thd->end_statement();
thd->cleanup_after_query();
DBUG_PRINT("info", ("EXECUTED %s.%s ret: %d", dbname.str, name.str, ret));
DBUG_RETURN(ret);
}
/*
Compiles an event before it's execution. Compiles the anonymous
sp_head object held by the event
SYNOPSIS
Event_job_data::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
RETURN VALUE
0 success
EVEX_COMPILE_ERROR error during compilation
EVEX_MICROSECOND_UNSUP mysql.event was tampered
*/
int
Event_job_data::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;
int old_db_length;
char *old_query;
uint old_query_len;
ulong old_sql_mode= thd->variables.sql_mode;
char create_buf[15 * STRING_BUFFER_USUAL_SIZE];
String show_create(create_buf, sizeof(create_buf), system_charset_info);
CHARSET_INFO *old_character_set_client,
*old_collation_connection,
*old_character_set_results;
Security_context save_ctx;
DBUG_ENTER("Event_job_data::compile");
show_create.length(0);
switch (get_fake_create_event(&show_create)) {
case EVEX_MICROSECOND_UNSUP:
DBUG_RETURN(EVEX_MICROSECOND_UNSUP);
case 0:
break;
default:
DBUG_ASSERT(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_PRINT("info",("old_sql_mode: %lu new_sql_mode: %lu",old_sql_mode, sql_mode));
thd->variables.sql_mode= this->sql_mode;
/* 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;
old_db_length= thd->db_length;
thd->db= dbname.str;
thd->db_length= dbname.length;
thd->query= show_create.c_ptr_safe();
thd->query_length= show_create.length();
DBUG_PRINT("info", ("query: %s",thd->query));
event_change_security_context(thd, definer_user, definer_host, dbname,
&save_ctx);
thd->lex= &lex;
mysql_init_query(thd, thd->query, thd->query_length);
if (MYSQLparse((void *)thd) || thd->is_fatal_error)
{
DBUG_PRINT("error", ("error during compile or thd->is_fatal_error: %d",
thd->is_fatal_error));
lex.unit.cleanup();
sql_print_error("Event Scheduler: "
"%serror during compilation of %s.%s",
thd->is_fatal_error ? "fatal " : "",
dbname.str, name.str);
ret= EVEX_COMPILE_ERROR;
goto done;
}
DBUG_PRINT("note", ("success compiling %s.%s", dbname.str, name.str));
sphead= lex.sphead;
sphead->set_definer(definer.str, definer.length);
sphead->set_info(0, 0, &lex.sp_chistics, sql_mode);
sphead->optimize();
ret= 0;
done:
lex_end(&lex);
event_restore_security_context(thd, &save_ctx);
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.sql_mode= old_sql_mode;
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);
}
/*
Checks whether two events are in the same schema
SYNOPSIS
event_basic_db_equal()
db Schema
et Compare et->dbname to `db`
RETURN VALUE
TRUE Equal
FALSE Not equal
*/
bool
event_basic_db_equal(LEX_STRING db, Event_basic *et)
{
return !sortcmp_lex_string(et->dbname, db, system_charset_info);
}
/*
Checks whether an event has equal `db` and `name`
SYNOPSIS
event_basic_identifier_equal()
db Schema
name Name
et The event object
RETURN VALUE
TRUE Equal
FALSE Not equal
*/
bool
event_basic_identifier_equal(LEX_STRING db, LEX_STRING name, Event_basic *b)
{
return !sortcmp_lex_string(name, b->name, system_charset_info) &&
!sortcmp_lex_string(db, b->dbname, system_charset_info);
}
/*
Switches the security context.
SYNOPSIS
event_change_security_context()
thd Thread
user The user
host The host of the user
db The schema for which the security_ctx will be loaded
backup Where to store the old context
RETURN VALUE
FALSE OK
TRUE Error (generates error too)
*/
static bool
event_change_security_context(THD *thd, LEX_STRING user, LEX_STRING host,
LEX_STRING db, Security_context *backup)
{
DBUG_ENTER("event_change_security_context");
DBUG_PRINT("info",("%s@%s@%s", user.str, host.str, db.str));
#ifndef NO_EMBEDDED_ACCESS_CHECKS
*backup= thd->main_security_ctx;
if (acl_getroot_no_password(&thd->main_security_ctx, user.str, host.str,
host.str, db.str))
{
my_error(ER_NO_SUCH_USER, MYF(0), user.str, host.str);
DBUG_RETURN(TRUE);
}
thd->security_ctx= &thd->main_security_ctx;
#endif
DBUG_RETURN(FALSE);
}
/*
Restores the security context.
SYNOPSIS
event_restore_security_context()
thd Thread
backup Context to switch to
*/
static void
event_restore_security_context(THD *thd, Security_context *backup)
{
DBUG_ENTER("event_restore_security_context");
#ifndef NO_EMBEDDED_ACCESS_CHECKS
if (backup)
{
thd->main_security_ctx= *backup;
thd->security_ctx= &thd->main_security_ctx;
}
#endif
DBUG_VOID_RETURN;
}
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