mirror/mariadb
1
0
Fork 0
mirror of https://github.com/MariaDB/server.git synced 2025-01-16 20:12:31 +01:00
Code Issues Projects Releases Packages Wiki Activity Actions
mariadb/sql/event_data_objects.cc
unknown f09496c8c2 Bug#25411 (trigger code truncated), PART II 
Bug 28127 (Some valid identifiers names are not parsed correctly)
Bug 26302 (MySQL server cuts off trailing "*/" from comments in SP/func)

This patch is the second part of a major cleanup, required to fix
Bug 25411 (trigger code truncated).

The root cause of the issue stems from the function skip_rear_comments,
which was a work around to remove "extra" "*/" characters from the query
text, when parsing a query and reusing the text fragments to represent a
view, trigger, function or stored procedure.
The reason for this work around is that "special comments",
like /*!50002 XXX */, were not parsed properly, so that a query like:
  AAA /*!50002 BBB */ CCC
would be seen by the parser as "AAA BBB */ CCC" when the current version
is greater or equal to 5.0.2

The root cause of this stems from how special comments are parsed.
Special comments are really out-of-bound text that appear inside a query,
that affects how the parser behave.
In nature, /*!50002 XXX */ in MySQL is similar to the C concept
of preprocessing :
  #if VERSION >= 50002
  XXX
  #endif

Depending on the current VERSION of the server, either the special comment
should be expanded or it should be ignored, but in all cases the "text" of
the query should be re-written to strip the "/*!50002" and "*/" markers,
which does not belong to the SQL language itself.

Prior to this fix, these markers would leak into :
- the storage format for VIEW,
- the storage format for FUNCTION,
- the storage format for FUNCTION parameters, in mysql.proc (param_list),
- the storage format for PROCEDURE,
- the storage format for PROCEDURE parameters, in mysql.proc (param_list),
- the storage format for TRIGGER,
- the binary log used for replication.

In all cases, not only this cause format corruption, but also provide a vector
for dormant security issues, by allowing to tunnel code that will be activated
after an upgrade.

The proper solution is to deal with special comments strictly during parsing,
when accepting a query from the outside world.
Once a query is parsed and an object is created with a persistant
representation, this object should not arbitrarily mutate after an upgrade.
In short, special comments are a useful but limited feature for MYSQLdump,
when used at an *interface* level to facilitate import/export,
but bloating the server *internal* storage format is *not* the proper way
to deal with configuration management of the user logic.

With this fix:
- the Lex_input_stream class now acts as a comment pre-processor,
and either expands or ignore special comments on the fly.
- MYSQLlex and sql_yacc.yy have been cleaned up to strictly use the
public interface of Lex_input_stream. In particular, how the input stream
accepts or rejects a character is private to Lex_input_stream, and the
internal buffer pointers of that class are strictly private, and should not
be tempered with during parsing.

This caused many changes mostly in sql_lex.cc.

During the code cleanup in case MY_LEX_NUMBER_IDENT,
Bug 28127 (Some valid identifiers names are not parsed correctly)
was found and fixed.

By parsing special comments properly, and removing the function
'skip_rear_comments' [sic],
Bug 26302 (MySQL server cuts off trailing "*/" from comments in SP/func)
has been fixed as well.


sql/event_data_objects.cc:
  Cleanup of the code that extracts the query text
sql/sp.cc:
  Cleanup of the code that extracts the query text
sql/sp_head.cc:
  Cleanup of the code that extracts the query text
sql/sql_trigger.cc:
  Cleanup of the code that extracts the query text
sql/sql_view.cc:
  Cleanup of the code that extracts the query text
mysql-test/r/comments.result:
  Bug#25411 (trigger code truncated)
mysql-test/r/sp.result:
  Bug#25411 (trigger code truncated)
  Bug 26302 (MySQL server cuts off trailing "*/" from comments in SP/func)
mysql-test/r/trigger.result:
  Bug#25411 (trigger code truncated)
mysql-test/r/varbinary.result:
  Bug 28127 (Some valid identifiers names are not parsed correctly)
mysql-test/t/comments.test:
  Bug#25411 (trigger code truncated)
mysql-test/t/sp.test:
  Bug#25411 (trigger code truncated)
  Bug 26302 (MySQL server cuts off trailing "*/" from comments in SP/func)
mysql-test/t/trigger.test:
  Bug#25411 (trigger code truncated)
mysql-test/t/varbinary.test:
  Bug 28127 (Some valid identifiers names are not parsed correctly)
sql/sql_lex.cc:
  Implemented comment pre-processing in Lex_input_stream,
  major cleanup of the lex/yacc code to not use Lex_input_stream private members.
sql/sql_lex.h:
  Implemented comment pre-processing in Lex_input_stream,
  major cleanup of the lex/yacc code to not use Lex_input_stream private members.
sql/sql_yacc.yy:
  post merge fix : view_check_options must be parsed before signaling the end of the query
2007-06-12 15:23:58 -06:00

1998 lines
53 KiB
C++
Raw Blame History

/* 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"
#define EVEX_MAX_INTERVAL_VALUE 1000000000L
/*
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((uchar*) 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((uchar*) dbname.str, MYF(0));
my_free((uchar*) 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(Event_basic::ON_COMPLETION_DROP),
status(Event_basic::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.
See related code in sp_head::init_strings().
*/
void
Event_parse_data::init_body(THD *thd)
{
DBUG_ENTER("Event_parse_data::init_body");
/* This method is called from within the parser, from sql_yacc.yy */
DBUG_ASSERT(thd->m_lip != NULL);
body.length= thd->m_lip->get_cpp_ptr() - body_begin;
body.str= thd->strmake(body_begin, body.length);
trim_whitespace(thd->charset(), & body);
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 == Event_basic::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 == Event_basic::ENABLED)
{
status= Event_basic::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;
MYSQL_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 == 0 ||
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;
MYSQL_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;
MYSQL_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);
check_originator_id(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= (char*) 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;
}
/**
Set the originator id of the event to the server_id if executing on
the master or set to the server_id of the master if executing on
the slave. If executing on slave, also set status to SLAVESIDE_DISABLED.
SYNOPSIS
Event_parse_data::check_originator_id()
*/
void Event_parse_data::check_originator_id(THD *thd)
{
/* Disable replicated events on slave. */
if ((thd->system_thread == SYSTEM_THREAD_SLAVE_SQL) ||
(thd->system_thread == SYSTEM_THREAD_SLAVE_IO))
{
DBUG_PRINT("info", ("Invoked object status set to SLAVESIDE_DISABLED."));
if ((status == Event_basic::ENABLED) ||
(status == Event_basic::DISABLED))
status = Event_basic::SLAVESIDE_DISABLED;
originator = thd->server_id;
}
else
originator = server_id;
}
/*
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()
: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;
}
/*
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;
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))
goto error;
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;
MYSQL_TIME time;
LEX_STRING tz_name;
DBUG_ENTER("Event_queue_element::load_from_row");
if (!table)
goto error;
if (table->s->fields < ET_FIELD_COUNT)
goto error;
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))
goto error;
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));
/* Set event status (ENABLED | SLAVESIDE_DISABLED | DISABLED) */
switch (ptr[0])
{
case 'E' :
status = Event_queue_element::ENABLED;
break;
case 'S' :
status = Event_queue_element::SLAVESIDE_DISABLED;
break;
case 'D' :
default:
status = Event_queue_element::DISABLED;
break;
}
if ((ptr= get_field(&mem_root, table->field[ET_FIELD_ORIGINATOR])) == NullS)
goto error;
originator = 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)
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;
if (load_string_fields(table->field,
ET_FIELD_BODY, &body,
ET_FIELD_COUNT))
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;
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(MYSQL_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));
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)
{
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::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_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 MYSQL_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 MYSQL_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)
{
Event_db_repository *db_repository= Events::get_db_repository();
int ret;
DBUG_ENTER("Event_queue_element::update_timing_fields");
DBUG_PRINT("enter", ("name: %*s", (int) name.length, name.str));
/* No need to update if nothing has changed */
if (!(status_changed || last_executed_changed))
DBUG_RETURN(0);
ret= db_repository->update_timing_fields_for_event(thd,
dbname, name,
last_executed_changed,
last_executed,
status_changed,
(ulonglong) status);
last_executed_changed= status_changed= FALSE;
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.
*/
MYSQL_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]",
(int) 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 if (status == Event_timed::SLAVESIDE_DISABLED)
buf->append(STRING_WITH_LEN("DISABLE ON SLAVE"));
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 an artificial stored procedure to parse as an event definition.
*/
bool
Event_job_data::construct_sp_sql(THD *thd, String *sp_sql)
{
LEX_STRING buffer;
const uint STATIC_SQL_LENGTH= 44;
DBUG_ENTER("Event_job_data::construct_sp_sql");
/*
Allocate a large enough buffer on the thread execution memory
root to avoid multiple [re]allocations on system heap
*/
buffer.length= STATIC_SQL_LENGTH + name.length + body.length;
if (! (buffer.str= (char*) thd->alloc(buffer.length)))
DBUG_RETURN(TRUE);
sp_sql->set(buffer.str, buffer.length, system_charset_info);
sp_sql->length(0);
sp_sql->append(C_STRING_WITH_LEN("CREATE "));
sp_sql->append(C_STRING_WITH_LEN("PROCEDURE "));
/*
Let's use the same name as the event name to perhaps produce a
better error message in case it is a part of some parse error.
We're using append_identifier here to successfully parse
events with reserved names.
*/
append_identifier(thd, sp_sql, name.str, name.length);
/*
The default SQL security of a stored procedure is DEFINER. We
have already activated the security context of the event, so
let's execute the procedure with the invoker rights to save on
resets of security contexts.
*/
sp_sql->append(C_STRING_WITH_LEN("() SQL SECURITY INVOKER "));
sp_sql->append(body.str, body.length);
DBUG_RETURN(thd->is_fatal_error);
}
/**
Get DROP EVENT statement to binlog the drop of ON COMPLETION NOT
PRESERVE event.
*/
bool
Event_job_data::construct_drop_event_sql(THD *thd, String *sp_sql)
{
LEX_STRING buffer;
const uint STATIC_SQL_LENGTH= 14;
DBUG_ENTER("Event_job_data::construct_drop_event_sql");
buffer.length= STATIC_SQL_LENGTH + name.length*2 + dbname.length*2;
if (! (buffer.str= (char*) thd->alloc(buffer.length)))
DBUG_RETURN(TRUE);
sp_sql->set(buffer.str, buffer.length, system_charset_info);
sp_sql->length(0);
sp_sql->append(C_STRING_WITH_LEN("DROP EVENT "));
append_identifier(thd, sp_sql, dbname.str, dbname.length);
sp_sql->append('.');
append_identifier(thd, sp_sql, name.str, name.length);
DBUG_RETURN(thd->is_fatal_error);
}
/**
Compiles and executes the event (the underlying sp_head object)
@retval TRUE error (reported to the error log)
@retval FALSE success
*/
bool
Event_job_data::execute(THD *thd, bool drop)
{
String sp_sql;
#ifndef NO_EMBEDDED_ACCESS_CHECKS
Security_context event_sctx, *save_sctx= NULL;
#endif
CHARSET_INFO *charset_connection;
List<Item> empty_item_list;
bool ret= TRUE;
DBUG_ENTER("Event_job_data::execute");
mysql_reset_thd_for_next_command(thd);
/*
MySQL parser currently assumes that current database is either
present in THD or all names in all statements are fully specified.
And yet not fully specified names inside stored programs must be
be supported, even if the current database is not set:
CREATE PROCEDURE db1.p1() BEGIN CREATE TABLE t1; END//
-- in this example t1 should be always created in db1 and the statement
must parse even if there is no current database.
To support this feature and still address the parser limitation,
we need to set the current database here.
We don't have to call mysql_change_db, since the checks performed
in it are unnecessary for the purpose of parsing, and
mysql_change_db will be invoked anyway later, to activate the
procedure database before it's executed.
*/
thd->set_db(dbname.str, dbname.length);
#ifndef NO_EMBEDDED_ACCESS_CHECKS
if (event_sctx.change_security_context(thd,
&definer_user, &definer_host,
&dbname, &save_sctx))
{
sql_print_error("Event Scheduler: "
"[%s].[%s.%s] execution failed, "
"failed to authenticate the user.",
definer.str, dbname.str, name.str);
goto end;
}
#endif
if (check_access(thd, EVENT_ACL, dbname.str,
0, 0, 0, is_schema_db(dbname.str)))
{
/*
This aspect of behavior is defined in the worklog,
and this is how triggers work too: if TRIGGER
privilege is revoked from trigger definer,
triggers are not executed.
*/
sql_print_error("Event Scheduler: "
"[%s].[%s.%s] execution failed, "
"user no longer has EVENT privilege.",
definer.str, dbname.str, name.str);
goto end;
}
if (construct_sp_sql(thd, &sp_sql))
goto end;
/*
Set up global thread attributes to reflect the properties of
this Event. We can simply reset these instead of 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.
*/
charset_connection= get_charset_by_csname("utf8",
MY_CS_PRIMARY, MYF(MY_WME));
thd->variables.character_set_client= charset_connection;
thd->variables.character_set_results= charset_connection;
thd->variables.collation_connection= charset_connection;
thd->update_charset();
thd->variables.sql_mode= sql_mode;
thd->variables.time_zone= time_zone;
/*
Peculiar initialization order is a crutch to avoid races in SHOW
PROCESSLIST which reads thd->{query/query_length} without a mutex.
*/
thd->query_length= 0;
thd->query= sp_sql.c_ptr_safe();
thd->query_length= sp_sql.length();
{
Lex_input_stream lip(thd, thd->query, thd->query_length);
thd->m_lip= &lip;
lex_start(thd);
int err= MYSQLparse(thd);
if (err || thd->is_fatal_error)
{
sql_print_error("Event Scheduler: "
"%serror during compilation of %s.%s",
thd->is_fatal_error ? "fatal " : "",
(const char *) dbname.str, (const char *) name.str);
goto end;
}
}
{
sp_head *sphead= thd->lex->sphead;
DBUG_ASSERT(sphead);
if (thd->enable_slow_log)
sphead->m_flags|= sp_head::LOG_SLOW_STATEMENTS;
sphead->m_flags|= sp_head::LOG_GENERAL_LOG;
sphead->set_info(0, 0, &thd->lex->sp_chistics, sql_mode);
sphead->optimize();
ret= sphead->execute_procedure(thd, &empty_item_list);
/*
There is no pre-locking and therefore there should be no
tables open and locked left after execute_procedure.
*/
}
end:
if (drop && !thd->is_fatal_error)
{
/*
We must do it here since here we're under the right authentication
ID of the event definer.
*/
sql_print_information("Event Scheduler: Dropping %s.%s",
(const char *) dbname.str, (const char *) name.str);
/*
Construct a query for the binary log, to ensure the event is dropped
on the slave
*/
if (construct_drop_event_sql(thd, &sp_sql))
ret= 1;
else
{
/*
Peculiar initialization order is a crutch to avoid races in SHOW
PROCESSLIST which reads thd->{query/query_length} without a mutex.
*/
thd->query_length= 0;
thd->query= sp_sql.c_ptr_safe();
thd->query_length= sp_sql.length();
if (Events::drop_event(thd, dbname, name, FALSE))
ret= 1;
}
}
if (thd->lex->sphead) /* NULL only if a parse error */
{
delete thd->lex->sphead;
thd->lex->sphead= NULL;
}
#ifndef NO_EMBEDDED_ACCESS_CHECKS
if (save_sctx)
event_sctx.restore_security_context(thd, save_sctx);
#endif
lex_end(thd->lex);
thd->lex->unit.cleanup();
thd->end_statement();
thd->cleanup_after_query();
DBUG_PRINT("info", ("EXECUTED %s.%s ret: %d", dbname.str, name.str, ret));
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);
}
Reference in a new issue View git blame Copy permalink