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event_data_objects.cc
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/* Copyright (c) 2005, 2018, Oracle and/or its affiliates. All rights reserved.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License, version 2.0,
as published by the Free Software Foundation.
This program is also distributed with certain software (including
but not limited to OpenSSL) that is licensed under separate terms,
as designated in a particular file or component or in included license
documentation. The authors of MySQL hereby grant you an additional
permission to link the program and your derivative works with the
separately licensed software that they have included with MySQL.
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, version 2.0, for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
#include "sql/event_data_objects.h"
#include <string.h>
#include "lex_string.h"
#include "m_ctype.h"
#include "m_string.h"
#include "my_dbug.h"
#include "my_loglevel.h"
#include "my_sys.h"
#include "mysql/components/services/log_builtins.h"
#include "mysql/components/services/log_shared.h"
#include "mysql/psi/mysql_sp.h"
#include "mysql/psi/mysql_statement.h"
#include "mysql/psi/psi_base.h"
#include "mysql/service_mysql_alloc.h"
#include "mysql_time.h"
#include "mysqld.h"
#include "mysqld_error.h"
#include "sql/auth/auth_acls.h"
// struct Time_zone
#include "sql/auth/auth_common.h" // EVENT_ACL
#include "sql/auth/sql_security_ctx.h"
#include "sql/dd/dd_event.h" // dd::get_old_interval_type
#include "sql/dd/string_type.h"
#include "sql/dd/types/event.h"
#include "sql/derror.h"
#include "sql/event_parse_data.h"
#include "sql/events.h"
// append_identifier
#include "sql/log.h"
#include "sql/psi_memory_key.h"
#include "sql/sp_head.h"
#include "sql/sql_class.h"
#include "sql/sql_const.h"
#include "sql/sql_digest_stream.h"
#include "sql/sql_error.h"
#include "sql/sql_lex.h"
#include "sql/sql_list.h"
#include "sql/sql_parse.h" // parse_sql
#include "sql/sql_show.h" // append_definer,
#include "sql/sql_time.h" // interval_type_to_name
#include "sql/system_variables.h"
#include "sql/table.h"
#include "sql/thd_raii.h"
#include "sql/thr_malloc.h"
#include "sql/transaction.h"
// date_add_interval,
// calc_time_diff.
#include "sql/tztime.h" // my_tz_find, my_tz_OFFSET0
#include "sql_string.h"
class Item;
/**
@addtogroup Event_Scheduler
@{
*/
#ifdef HAVE_PSI_INTERFACE
void init_scheduler_psi_keys() {
const char *category = "scheduler";
mysql_statement_register(category, &Event_queue_element_for_exec::psi_info,
1);
}
PSI_statement_info Event_queue_element_for_exec::psi_info = {0, "event", 0,
PSI_DOCUMENT_ME};
#endif
static inline LEX_STRING make_lex_string(MEM_ROOT *mem_root, const char *str) {
LEX_STRING lex_str;
size_t len = strlen(str);
lex_str.str = strmake_root(mem_root, str, len);
lex_str.length = len;
return lex_str;
}
static inline LEX_STRING make_lex_string(MEM_ROOT *mem_root,
const dd::String_type &str) {
LEX_STRING lex_str;
lex_str.str = strmake_root(mem_root, str.c_str(), str.length());
lex_str.length = str.length();
return lex_str;
}
static inline LEX_CSTRING make_lex_cstring(MEM_ROOT *mem_root,
const dd::String_type &str) {
LEX_CSTRING lex_cstr;
lex_cstr.str = strmake_root(mem_root, str.c_str(), str.length());
lex_cstr.length = str.length();
return lex_cstr;
}
/*************************************************************************/
/**
Event_creation_ctx -- creation context of events.
*/
class Event_creation_ctx : public Stored_program_creation_ctx {
public:
static bool create_event_creation_ctx(const dd::Event &event_obj,
Stored_program_creation_ctx **ctx);
public:
virtual Stored_program_creation_ctx *clone(MEM_ROOT *mem_root) {
return new (mem_root)
Event_creation_ctx(m_client_cs, m_connection_cl, m_db_cl);
}
protected:
virtual Object_creation_ctx *create_backup_ctx(THD *) const {
/*
We can avoid usual backup/restore employed in stored programs since we
know that this is a top level statement and the worker thread is
allocated exclusively to execute this event.
*/
return NULL;
}
virtual void delete_backup_ctx() { destroy(this); }
private:
Event_creation_ctx(const CHARSET_INFO *client_cs,
const CHARSET_INFO *connection_cl,
const CHARSET_INFO *db_cl)
: Stored_program_creation_ctx(client_cs, connection_cl, db_cl) {}
};
// Prepare a event creation context object.
bool Event_creation_ctx::create_event_creation_ctx(
const dd::Event &event_obj, Stored_program_creation_ctx **ctx) {
const CHARSET_INFO *client_cs = nullptr;
const CHARSET_INFO *connection_cl = nullptr;
const CHARSET_INFO *db_cl = nullptr;
bool invalid_creation_ctx = false;
auto collation_info = [](uint id) { return get_charset(id, MYF(0)); };
// Set collation or charset attribute of client, connection and database.
client_cs =
collation_info(static_cast<uint>(event_obj.client_collation_id()));
connection_cl =
collation_info(static_cast<uint>(event_obj.connection_collation_id()));
db_cl = collation_info(static_cast<uint>(event_obj.schema_collation_id()));
// Create the context.
*ctx = new (*THR_MALLOC) Event_creation_ctx(client_cs, connection_cl, db_cl);
return invalid_creation_ctx;
}
/*************************************************************************/
/*
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(key_memory_Event_queue_element_for_exec_names, db.str,
dbname.length = db.length, MYF(MY_WME))))
return true;
if (!(name.str = my_strndup(key_memory_Event_queue_element_for_exec_names,
n.str, name.length = n.length, MYF(MY_WME)))) {
my_free(dbname.str);
return true;
}
return false;
}
void Event_queue_element_for_exec::claim_memory_ownership() {
my_claim(dbname.str);
my_claim(name.str);
}
/*
Destructor
SYNOPSIS
Event_queue_element_for_exec::~Event_queue_element_for_exec()
*/
Event_queue_element_for_exec::~Event_queue_element_for_exec() {
my_free(dbname.str);
my_free(name.str);
}
/*
Constructor
SYNOPSIS
Event_basic::Event_basic()
*/
Event_basic::Event_basic()
: m_schema_name(NULL_STR), m_event_name(NULL_STR), m_time_zone(nullptr) {
DBUG_ENTER("Event_basic::Event_basic");
/* init memory root */
init_sql_alloc(key_memory_event_basic_root, &mem_root, 256, 512);
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;
}
/*
Constructor
SYNOPSIS
Event_queue_element::Event_queue_element()
*/
Event_queue_element::Event_queue_element()
: m_on_completion(Event_parse_data::ON_COMPLETION_DROP),
m_status(Event_parse_data::ENABLED),
m_last_executed(0),
m_execute_at(0),
m_starts(0),
m_ends(0),
m_starts_null(true),
m_ends_null(true),
m_execute_at_null(true),
m_expression(0),
m_dropped(false),
m_execution_count(0) {}
/*
Destructor
SYNOPSIS
Event_queue_element::Event_queue_element()
*/
Event_queue_element::~Event_queue_element() {}
/*
Constructor
SYNOPSIS
Event_timed::Event_timed()
*/
Event_timed::Event_timed() : m_created(0), m_modified(0), m_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() : m_sql_mode(0) {}
/*
Init all member variables
SYNOPSIS
Event_timed::init()
*/
void Event_timed::init() {
DBUG_ENTER("Event_timed::init");
m_definer_user = NULL_CSTR;
m_definer_host = NULL_CSTR;
m_definition = NULL_STR;
m_comment = NULL_STR;
m_sql_mode = 0;
DBUG_VOID_RETURN;
}
// Fill the Event_job_data members from the Data Dictionary Event Object.
bool Event_job_data::fill_event_info(THD *thd, const dd::Event &event_obj,
const char *schema_name) {
DBUG_ENTER("Event_job_data::fill_event_info");
m_schema_name = make_lex_string(&mem_root, schema_name);
m_event_name = make_lex_string(&mem_root, event_obj.name());
dd::String_type tmp(event_obj.definer_user());
tmp.append("@");
tmp.append(event_obj.definer_host());
m_definer = make_lex_string(&mem_root, tmp);
String str(event_obj.time_zone().c_str(), &my_charset_latin1);
m_time_zone = my_tz_find(thd, &str);
m_definition = make_lex_string(&mem_root, event_obj.definition());
if (m_time_zone == NULL) DBUG_RETURN(true);
Event_creation_ctx::create_event_creation_ctx(event_obj, &m_creation_ctx);
if (m_creation_ctx == nullptr) DBUG_RETURN(true);
m_definer_user = make_lex_cstring(&mem_root, event_obj.definer_user());
m_definer_host = make_lex_cstring(&mem_root, event_obj.definer_host());
m_sql_mode = event_obj.sql_mode();
DBUG_RETURN(false);
}
// Fill the Event_queue_element members from the Data Dictionary Event Object.
bool Event_queue_element::fill_event_info(THD *thd, const dd::Event &event_obj,
const char *schema_name) {
DBUG_ENTER("Even_queue_element::fill_event_info");
m_schema_name = make_lex_string(&mem_root, schema_name);
m_event_name = make_lex_string(&mem_root, event_obj.name());
dd::String_type tmp(event_obj.definer_user());
tmp.append("@");
tmp.append(event_obj.definer_host());
m_definer = make_lex_string(&mem_root, tmp);
String str(event_obj.time_zone().c_str(), &my_charset_latin1);
m_time_zone = my_tz_find(thd, &str);
if (m_time_zone == NULL) DBUG_RETURN(true);
m_starts_null = event_obj.is_starts_null();
if (!m_starts_null) m_starts = event_obj.starts();
m_ends_null = event_obj.is_ends_null();
if (!m_ends_null) m_ends = event_obj.ends();
if (!event_obj.is_interval_value_null())
m_expression = event_obj.interval_value();
else
m_expression = 0;
m_execute_at_null = event_obj.is_execute_at_null();
/*
If neither STARTS and ENDS is set, then both fields are empty.
Hence, if execute_at is empty there is an error.
*/
DBUG_ASSERT(
!(m_starts_null && m_ends_null && !m_expression && m_execute_at_null));
if (!m_expression && !m_execute_at_null)
m_execute_at = event_obj.execute_at();
if (!event_obj.is_interval_field_null())
m_interval = dd::get_old_interval_type(event_obj.interval_field());
else
m_interval = INTERVAL_YEAR;
if (!event_obj.is_last_executed_null())
m_last_executed = event_obj.last_executed();
m_status = dd::get_old_status(event_obj.event_status());
m_originator = event_obj.originator();
m_on_completion = dd::get_old_on_completion(event_obj.on_completion());
DBUG_RETURN(false);
}
// Fill the Event_timed members from the Data Dictionary Event Object.
bool Event_timed::fill_event_info(THD *thd, const dd::Event &event_obj,
const char *schema_name) {
DBUG_ENTER("Event_timed::fill_event_info");
if (Event_queue_element::fill_event_info(thd, event_obj, schema_name))
DBUG_RETURN(true);
m_definition = make_lex_string(&mem_root, event_obj.definition());
m_definition_utf8 = make_lex_string(&mem_root, event_obj.definition_utf8());
if (Event_creation_ctx::create_event_creation_ctx(event_obj,
&m_creation_ctx)) {
push_warning_printf(thd, Sql_condition::SL_WARNING,
ER_EVENT_INVALID_CREATION_CTX,
ER_THD(thd, ER_EVENT_INVALID_CREATION_CTX),
m_schema_name.str, m_event_name.str);
}
if (m_creation_ctx == nullptr) DBUG_RETURN(true);
m_definer_user = make_lex_cstring(&mem_root, event_obj.definer_user());
m_definer_host = make_lex_cstring(&mem_root, event_obj.definer_host());
m_created = event_obj.created(true);
m_modified = event_obj.last_altered(true);
m_comment = make_lex_string(&mem_root, event_obj.comment());
m_sql_mode = event_obj.sql_mode();
DBUG_RETURN(false);
}
/*
add_interval() adds a specified interval to time 'ltime' in time
zone 'time_zone', and returns the result converted to the number of
seconds since epoch (aka Unix time; in UTC time zone). Zero result
means an error.
*/
static my_time_t add_interval(MYSQL_TIME *ltime, const Time_zone *time_zone,
interval_type scale, Interval interval) {
if (date_add_interval(ltime, scale, interval)) return 0;
bool not_used;
return time_zone->TIME_to_gmt_sec(ltime, ¬_used);
}
/**
Computes the sum of a timestamp plus interval.
@param time_zone event time zone
@param next the sum
@param start add interval_value to this time
@param time_now current time
@param i_value quantity of time type interval to add
@param i_type type of interval to add (SECOND, MINUTE, HOUR, WEEK
...)
@retval returns 0 on success, 1 on error.
@note
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;
memset(&interval, 0, 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,
µsec_diff);
if (!negative) {
/*
The formula below returns the interval that, when added to
local_start, will always give the time in the future.
*/
interval.second = seconds_diff - seconds_diff % seconds + seconds;
next_time =
add_interval(&local_start, time_zone, INTERVAL_SECOND, interval);
if (next_time == 0) goto done;
}
if (next_time <= time_now) {
/*
If 'negative' is true above, then 'next_time == 0', and
'next_time <= time_now' is also true. If negative is false,
then next_time was set, but perhaps to the value that is less
then time_now. See below for elaboration.
*/
DBUG_ASSERT(negative || next_time > 0);
/*
If local_now < local_start, i.e. STARTS time is in the future
according to the local time (it always in the past according
to UTC---this is a prerequisite of this function), then
STARTS is almost always in the past according to the local
time too. However, in the time zone that has backward
Daylight Saving Time shift, the following may happen: suppose
we have a backward DST shift at certain date after 2:59:59,
i.e. local time goes 1:59:59, 2:00:00, ... , 2:59:59, (shift
here) 2:00:00 (again), ... , 2:59:59 (again), 3:00:00, ... .
Now suppose the time has passed the first 2:59:59, has been
shifted backward, and now is (the second) 2:20:00. The user
does CREATE EVENT with STARTS 'current-date 2:40:00'. Local
time 2:40:00 from create statement is treated by time
functions as the first such time, so according to UTC it comes
before the second 2:20:00. But according to local time it is
obviously in the future, so we end up in this branch.
Since we are in the second pass through 2:00:00--2:59:59, and
any local time form this interval is treated by system
functions as the time from the first pass, we have to find the
time for the next execution that is past the DST-affected
interval (past the second 2:59:59 for our example,
i.e. starting from 3:00:00). We do this in the loop until the
local time is mapped onto future UTC time. 'start' time is in
the past, so we may use 'do { } while' here, and add the first
interval right away.
Alternatively, it could be that local_now >= local_start. Now
for the example above imagine we do CREATE EVENT with STARTS
'current-date 2:10:00'. Local start 2:10 is in the past (now
is local 2:20), so we add an interval, and get next execution
time, say, 2:40. It is in the future according to local time,
but, again, since we are in the second pass through
2:00:00--2:59:59, 2:40 will be converted into UTC time in the
past. So we will end up in this branch again, and may add
intervals in a 'do { } while' loop.
Note that for any given event we may end up here only if event
next execution time will map to the time interval that is
passed twice, and only if the server was started during the
second pass, or the event is being created during the second
pass. After that, we never will get here (unless we again
start the server during the second pass). In other words,
such a condition is extremely rare.
*/
interval.second = seconds;
do {
next_time =
add_interval(&local_start, time_zone, INTERVAL_SECOND, interval);
if (next_time == 0) goto done;
} while (next_time <= time_now);
}
} else {
long diff_months = ((long)local_now.year - (long)local_start.year) * 12 +
((long)local_now.month - (long)local_start.month);
/*
Unlike for seconds above, the formula below returns the interval
that, when added to the local_start, will give the time in the
past, or somewhere in the current month. We are interested in
the latter case, to see if this time has already passed, or is
yet to come this month.
Note that the time is guaranteed to be in the past unless
(diff_months % months == 0), but no good optimization is
possible here, because (diff_months % months == 0) is what will
happen most of the time, as get_next_time() will be called right
after the execution of the event. We could pass last_executed
time to this function, and see if the execution has already
happened this month, but for that we will have to convert
last_executed from seconds since epoch to local broken-down
time, and this will greatly reduce the effect of the
optimization. So instead we keep the code simple and clean.
*/
interval.month = (ulong)(diff_months - diff_months % months);
next_time = add_interval(&local_start, time_zone, INTERVAL_MONTH, interval);
if (next_time == 0) goto done;
if (next_time <= time_now) {
interval.month = (ulong)months;
next_time =
add_interval(&local_start, time_zone, INTERVAL_MONTH, interval);
if (next_time == 0) goto done;
}
}
DBUG_ASSERT(time_now < next_time);
*next = next_time;
done:
DBUG_PRINT("info", ("next_time: %ld", (long)next_time));
DBUG_RETURN(next_time == 0);
}
/*
Computes next execution time.
@retval returns false on success, true on error.
@note The time is set in execute_at, if no more executions the latter is
*/
bool Event_queue_element::compute_next_execution_time(THD *thd) {
my_time_t time_now;
DBUG_ENTER("Event_queue_element::compute_next_execution_time");
DBUG_PRINT("enter",
("starts: %lu ends: %lu last_executed: %lu this: %p",
(long)m_starts, (long)m_ends, (long)m_last_executed, this));
if (m_status != Event_parse_data::ENABLED) {
DBUG_PRINT("compute_next_execution_time",
("Event %s is DISABLED", m_event_name.str));
goto ret;
}
/* If one-time, no need to do computation */
if (!m_expression) {
/* Let's check whether it was executed */
if (m_last_executed) {
DBUG_PRINT("info", ("One-time event %s.%s of was already executed",
m_schema_name.str, m_event_name.str));
m_dropped = (m_on_completion == Event_parse_data::ON_COMPLETION_DROP);
DBUG_PRINT("info", ("One-time event will be dropped: %d.", m_dropped));
m_status = Event_parse_data::DISABLED;
}
goto ret;
}
time_now = (my_time_t)thd->query_start_in_secs();
DBUG_PRINT("info", ("NOW: [%lu]", (ulong)time_now));
/* if time_now is after ends don't execute anymore */
if (!m_ends_null && m_ends < time_now) {
DBUG_PRINT("info", ("NOW after ENDS, don't execute anymore"));
/* time_now is after ends. don't execute anymore */
m_execute_at = 0;
m_execute_at_null = true;
if (m_on_completion == Event_parse_data::ON_COMPLETION_DROP)
m_dropped = true;
DBUG_PRINT("info", ("Dropped: %d", m_dropped));
m_status = Event_parse_data::DISABLED;
goto ret;
}
/*
Here time_now is before or equals ends if the latter is set.
Let's check whether time_now is before starts.
If so schedule for starts.
*/
if (!m_starts_null && time_now <= m_starts) {
if (time_now == m_starts && m_starts == m_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
*/
m_execute_at = m_starts;
m_execute_at_null = false;
goto ret;
}
}
if (!m_starts_null && !m_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 (!m_last_executed) {
DBUG_PRINT("info", ("Not executed so far."));
}
{
my_time_t next_exec;
if (get_next_time(m_time_zone, &next_exec, m_starts, time_now,
(int)m_expression, m_interval))
goto err;
/* There was previous execution */
if (m_ends < next_exec) {
DBUG_PRINT("info", ("Next execution of %s after ENDS. Stop executing.",
m_schema_name.str));
/* Next execution after ends. No more executions */
m_execute_at = 0;
m_execute_at_null = true;
if (m_on_completion == Event_parse_data::ON_COMPLETION_DROP)
m_dropped = true;
m_status = Event_parse_data::DISABLED;
} else {
DBUG_PRINT("info", ("Next[%lu]", (ulong)next_exec));
m_execute_at = next_exec;
m_execute_at_null = false;
}
}
goto ret;
} else if (m_starts_null && m_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 (m_last_executed) {
my_time_t next_exec;
if (get_next_time(m_time_zone, &next_exec, m_starts, time_now,
(int)m_expression, m_interval))
goto err;
m_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"));
m_execute_at = time_now;
}
m_execute_at_null = false;
} else {
/* either starts or m_ends is set */
if (!m_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 (!m_last_executed) {
DBUG_PRINT("info", ("Not executed so far."));
}
{
my_time_t next_exec;
if (get_next_time(m_time_zone, &next_exec, m_starts, time_now,
(int)m_expression, m_interval))
goto err;
m_execute_at = next_exec;
DBUG_PRINT("info", ("Next[%lu]", (ulong)next_exec));
}
m_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 (!m_last_executed)
m_execute_at = time_now;
else {
my_time_t next_exec;
if (get_next_time(m_time_zone, &next_exec, m_starts, time_now,
(int)m_expression, m_interval))
goto err;
if (m_ends < next_exec) {
DBUG_PRINT("info", ("Next execution after ENDS. Stop executing."));
m_execute_at = 0;
m_execute_at_null = true;
m_status = Event_parse_data::DISABLED;
if (m_on_completion == Event_parse_data::ON_COMPLETION_DROP)
m_dropped = true;
} else {
DBUG_PRINT("info", ("Next[%lu]", (ulong)next_exec));
m_execute_at = next_exec;
m_execute_at_null = false;
}
}
}
goto ret;
}
ret:
DBUG_PRINT("info", ("ret: 0 execute_at: %lu", (long)m_execute_at));
DBUG_RETURN(false);
err:
DBUG_PRINT("info", ("ret=1"));
DBUG_RETURN(true);
}
/**
Set last execution time.
@param thd THD context
*/
void Event_queue_element::mark_last_executed(THD *thd) {
m_last_executed = (my_time_t)thd->query_start_in_secs();
m_execution_count++;
}
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, 0));
buf->append(STRING_WITH_LEN("'"));
}
/**
Get SHOW CREATE EVENT as string
@param thd THD context.
@param buf String*, should be already allocated. CREATE EVENT goes
inside.
@retval 0 OK
*/
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)m_definition.length,
m_definition.str));
if (m_expression && Events::reconstruct_interval_expression(
&expr_buf, m_interval, m_expression))
DBUG_RETURN(EVEX_MICROSECOND_UNSUP);
buf->append(STRING_WITH_LEN("CREATE "));
append_definer(thd, buf, m_definer_user, m_definer_host);
buf->append(STRING_WITH_LEN("EVENT "));
append_identifier(thd, buf, m_event_name.str, m_event_name.length);
if (m_expression) {
buf->append(STRING_WITH_LEN(" ON SCHEDULE EVERY "));
buf->append(expr_buf);
buf->append(' ');
LEX_STRING *ival = &interval_type_to_name[m_interval];
buf->append(ival->str, ival->length);
if (!m_starts_null)
append_datetime(buf, m_time_zone, m_starts, STRING_WITH_LEN("STARTS"));
if (!m_ends_null)
append_datetime(buf, m_time_zone, m_ends, STRING_WITH_LEN("ENDS"));
} else {
append_datetime(buf, m_time_zone, m_execute_at,
STRING_WITH_LEN("ON SCHEDULE AT"));
}
if (m_on_completion == Event_parse_data::ON_COMPLETION_DROP)
buf->append(STRING_WITH_LEN(" ON COMPLETION NOT PRESERVE "));
else
buf->append(STRING_WITH_LEN(" ON COMPLETION PRESERVE "));
if (m_status == Event_parse_data::ENABLED)
buf->append(STRING_WITH_LEN("ENABLE"));
else if (m_status == Event_parse_data::SLAVESIDE_DISABLED)
buf->append(STRING_WITH_LEN("DISABLE ON SLAVE"));
else
buf->append(STRING_WITH_LEN("DISABLE"));
if (m_comment.length) {
buf->append(STRING_WITH_LEN(" COMMENT "));
append_unescaped(buf, m_comment.str, m_comment.length);
}
buf->append(STRING_WITH_LEN(" DO "));
buf->append(m_definition.str, m_definition.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 + m_event_name.length + m_definition.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, m_event_name.str, m_event_name.length);