write-after-read-protocol/sql/event_parse_data.cc at master · FlashSQL/write-after-read-protocol · GitHub

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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,

51 Franklin Street, Suite 500, Boston, MA 02110-1335 USA */

#include "sp_head.h"

#include "event_parse_data.h"

#include "sql_time.h" // TIME_to_timestamp

#include "item_timefunc.h" // get_interval_value

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()

:on_completion(Event_parse_data::ON_COMPLETION_DEFAULT),

status(Event_parse_data::ENABLED), status_changed(false),

do_not_create(FALSE), body_changed(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;

comment.str= NULL;

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;

}

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;

We'll come back later when we have the real on_completion value

if (on_completion == Event_parse_data::ON_COMPLETION_DEFAULT)

return;

if (on_completion == Event_parse_data::ON_COMPLETION_DROP)

{

switch (thd->lex->sql_command) {

case SQLCOM_CREATE_EVENT:

push_warning(thd, Sql_condition::SL_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_parse_data::ENABLED)

{

status= Event_parse_data::DISABLED;

status_changed= true;

push_warning(thd, Sql_condition::SL_NOTE,

ER_EVENT_EXEC_TIME_IN_THE_PAST,

ER(ER_EVENT_EXEC_TIME_IN_THE_PAST));

}

Check time/dates in ALTER EVENT

We check whether ALTER EVENT was given dates that are in the past.

However to know how to react, we need the ON COMPLETION type. Hence,

the check is deferred until we have the previous ON COMPLETION type

from the event-db to fall back on if nothing was specified in the

ALTER EVENT-statement.

SYNOPSIS

Event_parse_data::check_dates()

thd Thread

on_completion ON COMPLETION value currently in event-db.

Will be overridden by value in ALTER EVENT if given.

RETURN VALUE

TRUE an error occurred, do not ALTER

FALSE OK

bool

Event_parse_data::check_dates(THD *thd, int previous_on_completion)

{

if (on_completion == Event_parse_data::ON_COMPLETION_DEFAULT)

{

on_completion= previous_on_completion;

if (!ends_null)

check_if_in_the_past(thd, ends);

if (!execute_at_null)

check_if_in_the_past(thd, execute_at);

}

return do_not_create;

}

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, 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;

size_t definer_user_len= thd->lex->definer->user.length;

size_t 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_WORKER) ||

(thd->system_thread == SYSTEM_THREAD_SLAVE_IO))

{

DBUG_PRINT("info", ("Invoked object status set to SLAVESIDE_DISABLED."));

if ((status == Event_parse_data::ENABLED) ||

(status == Event_parse_data::DISABLED))

{

status= Event_parse_data::SLAVESIDE_DISABLED;

status_changed= true;

}

originator = thd->server_id;

}

else

originator = server_id;

}

write-after-read-protocol/sql/event_parse_data.cc at master · FlashSQL/write-after-read-protocol · GitHub

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