/* 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; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #define MYSQL_LEX 1 #include "mysql_priv.h" #include "events_priv.h" #include "events.h" #include "event_timed.h" #include "sp_head.h" /* Constructor SYNOPSIS Event_timed::Event_timed() */ Event_timed::Event_timed():in_spawned_thread(0),locked_by_thread_id(0), running(0), thread_id(0), status_changed(false), last_executed_changed(false), expression(0), created(0), modified(0), on_completion(Event_timed::ON_COMPLETION_DROP), status(Event_timed::ENABLED), sphead(0), sql_mode(0), body_begin(0), dropped(false), free_sphead_on_delete(true), flags(0) { pthread_mutex_init(&this->LOCK_running, MY_MUTEX_INIT_FAST); pthread_cond_init(&this->COND_finished, NULL); init(); } /* Destructor SYNOPSIS Event_timed::~Event_timed() */ Event_timed::~Event_timed() { deinit_mutexes(); if (free_sphead_on_delete) free_sp(); } /* Destructor SYNOPSIS Event_timed::~deinit_mutexes() */ void Event_timed::deinit_mutexes() { pthread_mutex_destroy(&this->LOCK_running); pthread_cond_destroy(&this->COND_finished); } /* Checks whether the event is running SYNOPSIS Event_timed::is_running() */ bool Event_timed::is_running() { bool ret; VOID(pthread_mutex_lock(&this->LOCK_running)); ret= running; VOID(pthread_mutex_unlock(&this->LOCK_running)); return ret; } /* Init all member variables SYNOPSIS Event_timed::init() */ void Event_timed::init() { DBUG_ENTER("Event_timed::init"); dbname.str= name.str= body.str= comment.str= 0; dbname.length= name.length= body.length= comment.length= 0; set_zero_time(&starts, MYSQL_TIMESTAMP_DATETIME); set_zero_time(&ends, MYSQL_TIMESTAMP_DATETIME); set_zero_time(&execute_at, MYSQL_TIMESTAMP_DATETIME); set_zero_time(&last_executed, MYSQL_TIMESTAMP_DATETIME); starts_null= ends_null= execute_at_null= TRUE; definer_user.str= definer_host.str= 0; definer_user.length= definer_host.length= 0; sql_mode= 0; DBUG_VOID_RETURN; } /* Set a name of the event SYNOPSIS Event_timed::init_name() thd THD spn the name extracted in the parser */ void Event_timed::init_name(THD *thd, sp_name *spn) { DBUG_ENTER("Event_timed::init_name"); /* During parsing, we must use thd->mem_root */ MEM_ROOT *root= thd->mem_root; /* We have to copy strings to get them into the right memroot */ dbname.length= spn->m_db.length; dbname.str= strmake_root(root, spn->m_db.str, spn->m_db.length); name.length= spn->m_name.length; name.str= strmake_root(root, spn->m_name.str, spn->m_name.length); if (spn->m_qname.length == 0) spn->init_qname(thd); DBUG_PRINT("dbname", ("len=%d db=%s",dbname.length, dbname.str)); DBUG_PRINT("name", ("len=%d name=%s",name.length, name.str)); DBUG_VOID_RETURN; } /* Set body of the event - what should be executed. SYNOPSIS Event_timed::init_body() thd THD NOTE The body is extracted by copying all data between the start of the body set by another method and the current pointer in Lex. Some questionable removal of characters is done in here, and that part should be refactored when the parser is smarter. */ void Event_timed::init_body(THD *thd) { DBUG_ENTER("Event_timed::init_body"); DBUG_PRINT("info", ("body=[%s] body_begin=0x%ld end=0x%ld", body_begin, body_begin, thd->lex->ptr)); body.length= thd->lex->ptr - body_begin; const uchar *body_end= body_begin + body.length - 1; /* Trim nuls or close-comments ('*'+'/') or spaces at the end */ while (body_begin < body_end) { if ((*body_end == '\0') || (my_isspace(thd->variables.character_set_client, *body_end))) { /* consume NULs and meaningless whitespace */ --body.length; --body_end; continue; } /* consume closing comments This is arguably wrong, but it's the best we have until the parser is changed to be smarter. FIXME PARSER See also the sp_head code, where something like this is done also. One idea is to keep in the lexer structure the count of the number of open-comments we've entered, and scan left-to-right looking for a closing comment IFF the count is greater than zero. Another idea is to remove the closing comment-characters wholly in the parser, since that's where it "removes" the opening characters. */ if ((*(body_end - 1) == '*') && (*body_end == '/')) { DBUG_PRINT("info", ("consumend one '*" "/' comment in the query '%s'", body_begin)); body.length-= 2; body_end-= 2; continue; } break; /* none were found, so we have excised all we can. */ } /* the first is always whitespace which I cannot skip in the parser */ while (my_isspace(thd->variables.character_set_client, *body_begin)) { ++body_begin; --body.length; } body.str= strmake_root(thd->mem_root, (char *)body_begin, body.length); DBUG_VOID_RETURN; } /* Set time for execution for one time events. SYNOPSIS Event_timed::init_execute_at() expr when (datetime) RETURN VALUE 0 OK EVEX_PARSE_ERROR fix_fields failed EVEX_BAD_PARAMS datetime is in the past ER_WRONG_VALUE wrong value for execute at */ int Event_timed::init_execute_at(THD *thd, Item *expr) { my_bool not_used; TIME ltime; my_time_t t; TIME time_tmp; DBUG_ENTER("Event_timed::init_execute_at"); if (expr->fix_fields(thd, &expr)) DBUG_RETURN(EVEX_PARSE_ERROR); /* 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); /* let's check whether time is in the past */ thd->variables.time_zone->gmt_sec_to_TIME(&time_tmp, (my_time_t) thd->query_start()); if ((not_used= expr->get_date(<ime, TIME_NO_ZERO_DATE))) DBUG_RETURN(ER_WRONG_VALUE); if (TIME_to_ulonglong_datetime(<ime) < TIME_to_ulonglong_datetime(&time_tmp)) DBUG_RETURN(EVEX_BAD_PARAMS); /* This may result in a 1970-01-01 date if ltime is > 2037-xx-xx. CONVERT_TZ has similar problem. mysql_priv.h currently lists #define TIMESTAMP_MAX_YEAR 2038 (see TIME_to_timestamp()) */ my_tz_UTC->gmt_sec_to_TIME(<ime,t=TIME_to_timestamp(thd,<ime,¬_used)); if (!t) { DBUG_PRINT("error", ("Execute AT after year 2037")); DBUG_RETURN(ER_WRONG_VALUE); } execute_at_null= FALSE; execute_at= ltime; DBUG_RETURN(0); } /* Set time for execution for transient events. SYNOPSIS Event_timed::init_interval() expr how much? new_interval what is the interval RETURN VALUE 0 OK EVEX_PARSE_ERROR fix_fields failed EVEX_BAD_PARAMS Interval is not positive EVEX_MICROSECOND_UNSUP Microseconds are not supported. */ int Event_timed::init_interval(THD *thd, Item *expr, interval_type new_interval) { String value; INTERVAL interval_tmp; DBUG_ENTER("Event_timed::init_interval"); if (expr->fix_fields(thd, &expr)) DBUG_RETURN(EVEX_PARSE_ERROR); value.alloc(MAX_DATETIME_FULL_WIDTH*MY_CHARSET_BIN_MB_MAXLEN); if (get_interval_value(expr, new_interval, &value, &interval_tmp)) DBUG_RETURN(EVEX_PARSE_ERROR); expression= 0; switch (new_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_MINUTE_MICROSECOND: /* day and hour are 0 */ case INTERVAL_HOUR_MICROSECOND: /* day is anyway 0 */ case INTERVAL_DAY_MICROSECOND: DBUG_RETURN(EVEX_MICROSECOND_UNSUP); expression= ((((interval_tmp.day*24) + interval_tmp.hour)*60+ interval_tmp.minute)*60 + interval_tmp.second) * 1000000L + interval_tmp.second_part; 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_SECOND_MICROSECOND: DBUG_RETURN(EVEX_MICROSECOND_UNSUP); expression= interval_tmp.second * 1000000L + interval_tmp.second_part; break; case INTERVAL_MICROSECOND: DBUG_RETURN(EVEX_MICROSECOND_UNSUP); case INTERVAL_LAST: DBUG_ASSERT(0); } if (interval_tmp.neg || expression > EVEX_MAX_INTERVAL_VALUE) DBUG_RETURN(EVEX_BAD_PARAMS); interval= new_interval; DBUG_RETURN(0); } /* Set activation time. SYNOPSIS Event_timed::init_starts() expr how much? interval what is the interval NOTES Note that activation time is not execution time. EVERY 5 MINUTE STARTS "2004-12-12 10:00:00" means that the event will be executed every 5 minutes but this will start at the date shown above. Expressions are possible : DATE_ADD(NOW(), INTERVAL 1 DAY) -- start tommorow at same time. RETURN VALUE 0 OK EVEX_PARSE_ERROR fix_fields failed EVEX_BAD_PARAMS starts before now */ int Event_timed::init_starts(THD *thd, Item *new_starts) { my_bool not_used; TIME ltime, time_tmp; my_time_t t; DBUG_ENTER("Event_timed::init_starts"); if (new_starts->fix_fields(thd, &new_starts)) DBUG_RETURN(EVEX_PARSE_ERROR); if ((not_used= new_starts->get_date(<ime, TIME_NO_ZERO_DATE))) DBUG_RETURN(EVEX_BAD_PARAMS); /* Let's check whether time is in the past */ thd->variables.time_zone->gmt_sec_to_TIME(&time_tmp, (my_time_t) thd->query_start()); DBUG_PRINT("info",("now =%lld", TIME_to_ulonglong_datetime(&time_tmp))); DBUG_PRINT("info",("starts=%lld", TIME_to_ulonglong_datetime(<ime))); if (TIME_to_ulonglong_datetime(<ime) < TIME_to_ulonglong_datetime(&time_tmp)) DBUG_RETURN(EVEX_BAD_PARAMS); /* This may result in a 1970-01-01 date if ltime is > 2037-xx-xx. CONVERT_TZ has similar problem. mysql_priv.h currently lists #define TIMESTAMP_MAX_YEAR 2038 (see TIME_to_timestamp()) */ my_tz_UTC->gmt_sec_to_TIME(<ime,t=TIME_to_timestamp(thd, <ime, ¬_used)); if (!t) { DBUG_PRINT("error", ("STARTS after year 2037")); DBUG_RETURN(EVEX_BAD_PARAMS); } starts= ltime; starts_null= FALSE; DBUG_RETURN(0); } /* Set deactivation time. SYNOPSIS Event_timed::init_ends() thd THD new_ends when? NOTES Note that activation time is not execution time. EVERY 5 MINUTE ENDS "2004-12-12 10:00:00" means that the event will be executed every 5 minutes but this will end at the date shown above. Expressions are possible : DATE_ADD(NOW(), INTERVAL 1 DAY) -- end tommorow at same time. RETURN VALUE 0 OK EVEX_PARSE_ERROR fix_fields failed ER_WRONG_VALUE starts distant date (after year 2037) EVEX_BAD_PARAMS ENDS before STARTS */ int Event_timed::init_ends(THD *thd, Item *new_ends) { TIME ltime, ltime_now; my_bool not_used; my_time_t t; DBUG_ENTER("Event_timed::init_ends"); if (new_ends->fix_fields(thd, &new_ends)) DBUG_RETURN(EVEX_PARSE_ERROR); DBUG_PRINT("info", ("convert to TIME")); if ((not_used= new_ends->get_date(<ime, TIME_NO_ZERO_DATE))) DBUG_RETURN(EVEX_BAD_PARAMS); /* This may result in a 1970-01-01 date if ltime is > 2037-xx-xx. CONVERT_TZ has similar problem. mysql_priv.h currently lists #define TIMESTAMP_MAX_YEAR 2038 (see TIME_to_timestamp()) */ DBUG_PRINT("info", ("get the UTC time")); my_tz_UTC->gmt_sec_to_TIME(<ime,t=TIME_to_timestamp(thd, <ime, ¬_used)); if (!t) { DBUG_PRINT("error", ("ENDS after year 2037")); DBUG_RETURN(EVEX_BAD_PARAMS); } /* Check whether ends is after starts */ DBUG_PRINT("info", ("ENDS after STARTS?")); if (!starts_null && my_time_compare(&starts, <ime) != -1) DBUG_RETURN(EVEX_BAD_PARAMS); /* The parser forces starts to be provided but one day STARTS could be set before NOW() and in this case the following check should be done. Check whether ENDS is not in the past. */ DBUG_PRINT("info", ("ENDS after NOW?")); my_tz_UTC->gmt_sec_to_TIME(<ime_now, thd->query_start()); if (my_time_compare(<ime_now, <ime) == 1) DBUG_RETURN(EVEX_BAD_PARAMS); ends= ltime; ends_null= FALSE; DBUG_RETURN(0); } /* Sets comment. SYNOPSIS Event_timed::init_comment() thd THD - used for memory allocation comment the string. */ void Event_timed::init_comment(THD *thd, LEX_STRING *set_comment) { DBUG_ENTER("Event_timed::init_comment"); comment.str= strmake_root(thd->mem_root, set_comment->str, comment.length= set_comment->length); DBUG_VOID_RETURN; } /* Inits definer (definer_user and definer_host) during parsing. SYNOPSIS Event_timed::init_definer() RETURN VALUE 0 OK */ int Event_timed::init_definer(THD *thd) { DBUG_ENTER("Event_timed::init_definer"); DBUG_PRINT("info",("init definer_user thd->mem_root=0x%lx " "thd->sec_ctx->priv_user=0x%lx", thd->mem_root, thd->security_ctx->priv_user)); definer_user.str= strdup_root(thd->mem_root, thd->security_ctx->priv_user); definer_user.length= strlen(thd->security_ctx->priv_user); DBUG_PRINT("info",("init definer_host thd->s_c->priv_host=0x%lx", thd->security_ctx->priv_host)); definer_host.str= strdup_root(thd->mem_root, thd->security_ctx->priv_host); definer_host.length= strlen(thd->security_ctx->priv_host); DBUG_PRINT("info",("init definer as whole")); definer.length= definer_user.length + definer_host.length + 1; definer.str= alloc_root(thd->mem_root, definer.length + 1); DBUG_PRINT("info",("copy the user")); memcpy(definer.str, definer_user.str, definer_user.length); definer.str[definer_user.length]= '@'; DBUG_PRINT("info",("copy the host")); memcpy(definer.str + definer_user.length + 1, definer_host.str, definer_host.length); definer.str[definer.length]= '\0'; DBUG_PRINT("info",("definer initted")); DBUG_RETURN(0); } /* Loads an event from a row from mysql.event SYNOPSIS Event_timed::load_from_row(MEM_ROOT *mem_root, 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(MEM_ROOT *mem_root, TABLE *table) { char *ptr; Event_timed *et; uint len; bool res1, res2; DBUG_ENTER("Event_timed::load_from_row"); if (!table) goto error; et= this; if (table->s->fields != Events::FIELD_COUNT) goto error; if ((et->dbname.str= get_field(mem_root, table->field[Events::FIELD_DB])) == NULL) goto error; et->dbname.length= strlen(et->dbname.str); if ((et->name.str= get_field(mem_root, table->field[Events::FIELD_NAME])) == NULL) goto error; et->name.length= strlen(et->name.str); if ((et->body.str= get_field(mem_root, table->field[Events::FIELD_BODY])) == NULL) goto error; et->body.length= strlen(et->body.str); if ((et->definer.str= get_field(mem_root, table->field[Events::FIELD_DEFINER])) == NullS) goto error; et->definer.length= strlen(et->definer.str); ptr= strchr(et->definer.str, '@'); if (! ptr) ptr= et->definer.str; len= ptr - et->definer.str; et->definer_user.str= strmake_root(mem_root, et->definer.str, len); et->definer_user.length= len; len= et->definer.length - len - 1; //1 is because of @ et->definer_host.str= strmake_root(mem_root, ptr + 1, len);/* 1:because of @*/ et->definer_host.length= len; et->starts_null= table->field[Events::FIELD_STARTS]->is_null(); res1= table->field[Events::FIELD_STARTS]-> get_date(&et->starts,TIME_NO_ZERO_DATE); et->ends_null= table->field[Events::FIELD_ENDS]->is_null(); res2= table->field[Events::FIELD_ENDS]->get_date(&et->ends, TIME_NO_ZERO_DATE); if (!table->field[Events::FIELD_INTERVAL_EXPR]->is_null()) et->expression= table->field[Events::FIELD_INTERVAL_EXPR]->val_int(); else et->expression= 0; /* If res1 and res2 are true then both fields are empty. Hence if Events::FIELD_EXECUTE_AT is empty there is an error. */ et->execute_at_null= table->field[Events::FIELD_EXECUTE_AT]->is_null(); DBUG_ASSERT(!(et->starts_null && et->ends_null && !et->expression && et->execute_at_null)); if (!et->expression && table->field[Events::FIELD_EXECUTE_AT]-> get_date(&et->execute_at, TIME_NO_ZERO_DATE)) goto error; /* In DB the values start from 1 but enum interval_type starts from 0 */ if (!table->field[Events::FIELD_TRANSIENT_INTERVAL]->is_null()) et->interval= (interval_type) ((ulonglong) table->field[Events::FIELD_TRANSIENT_INTERVAL]->val_int() - 1); else et->interval= (interval_type) 0; et->created= table->field[Events::FIELD_CREATED]->val_int(); et->modified= table->field[Events::FIELD_MODIFIED]->val_int(); table->field[Events::FIELD_LAST_EXECUTED]-> get_date(&et->last_executed, TIME_NO_ZERO_DATE); last_executed_changed= false; /* ToDo : Andrey . Find a way not to allocate ptr on event_mem_root */ if ((ptr= get_field(mem_root, table->field[Events::FIELD_STATUS])) == NullS) goto error; DBUG_PRINT("load_from_row", ("Event [%s] is [%s]", et->name.str, ptr)); et->status= (ptr[0]=='E'? Event_timed::ENABLED:Event_timed::DISABLED); /* ToDo : Andrey . Find a way not to allocate ptr on event_mem_root */ if ((ptr= get_field(mem_root, table->field[Events::FIELD_ON_COMPLETION])) == NullS) goto error; et->on_completion= (ptr[0]=='D'? Event_timed::ON_COMPLETION_DROP: Event_timed::ON_COMPLETION_PRESERVE); et->comment.str= get_field(mem_root, table->field[Events::FIELD_COMMENT]); if (et->comment.str != NullS) et->comment.length= strlen(et->comment.str); else et->comment.length= 0; et->sql_mode= (ulong) table->field[Events::FIELD_SQL_MODE]->val_int(); DBUG_RETURN(0); error: DBUG_RETURN(EVEX_GET_FIELD_FAILED); } /* Computes the sum of a timestamp plus interval. Presumed is that at least one previous execution has occured. SYNOPSIS get_next_time(TIME *start, int interval_value, interval_type interval) 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 3) We get the difference between time_now and `start`, then divide it by the months, respectively seconds and round up. Then we multiply monts/seconds by the rounded value and add it to `start` -> we get the next execution time. */ static bool get_next_time(TIME *next, TIME *start, TIME *time_now, TIME *last_exec, int i_value, interval_type i_type) { bool ret; INTERVAL interval; TIME tmp; longlong months=0, seconds=0; DBUG_ENTER("get_next_time"); DBUG_PRINT("enter", ("start=%llu now=%llu", TIME_to_ulonglong_datetime(start), TIME_to_ulonglong_datetime(time_now))); bzero(&interval, sizeof(interval)); 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", seconds, months)); if (seconds) { longlong seconds_diff; long microsec_diff; if (calc_time_diff(time_now, start, 1, &seconds_diff, µsec_diff)) { DBUG_PRINT("error", ("negative difference")); DBUG_ASSERT(0); } uint multiplier= seconds_diff / seconds; /* Increase the multiplier is the modulus is not zero to make round up. Or if time_now==start then we should not execute the same event two times for the same time get the next exec if the modulus is not */ DBUG_PRINT("info", ("multiplier=%d", multiplier)); if (seconds_diff % seconds || (!seconds_diff && last_exec->year) || TIME_to_ulonglong_datetime(time_now) == TIME_to_ulonglong_datetime(last_exec)) ++multiplier; interval.second= seconds * multiplier; DBUG_PRINT("info", ("multiplier=%u interval.second=%u", multiplier, interval.second)); tmp= *start; if (!(ret= date_add_interval(&tmp, INTERVAL_SECOND, interval))) *next= tmp; } else { /* PRESUMED is that at least one execution took already place */ int diff_months= (time_now->year - start->year)*12 + (time_now->month - start->month); /* Note: If diff_months is 0 that means we are in the same month as the last execution which is also the first execution. */ /* First we try with the smaller if not then + 1, because if we try with directly with +1 we will be after the current date but it could be that we will be 1 month ahead, so 2 steps are necessary. */ interval.month= (diff_months / months)*months; /* Check if the same month as last_exec (always set - prerequisite) An event happens at most once per month so there is no way to schedule it two times for the current month. This saves us from two calls to date_add_interval() if the event was just executed. But if the scheduler is started and there was at least 1 scheduled date skipped this one does not help and two calls to date_add_interval() will be done, which is a bit more expensive but compared to the rareness of the case is neglectable. */ if (time_now->year==last_exec->year && time_now->month==last_exec->month) interval.month+= months; tmp= *start; if ((ret= date_add_interval(&tmp, INTERVAL_MONTH, interval))) goto done; /* If `tmp` is still before time_now just add one more time the interval */ if (my_time_compare(&tmp, time_now) == -1) { interval.month+= months; tmp= *start; if ((ret= date_add_interval(&tmp, INTERVAL_MONTH, interval))) goto done; } *next= tmp; /* assert on that the next is after now */ DBUG_ASSERT(1==my_time_compare(next, time_now)); } done: DBUG_PRINT("info", ("next=%llu", TIME_to_ulonglong_datetime(next))); DBUG_RETURN(ret); } /* Computes next execution time. SYNOPSIS Event_timed::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 0000-00-00. */ bool Event_timed::compute_next_execution_time() { TIME time_now; int tmp; DBUG_ENTER("Event_timed::compute_next_execution_time"); DBUG_PRINT("enter", ("starts=%llu ends=%llu last_executed=%llu", TIME_to_ulonglong_datetime(&starts), TIME_to_ulonglong_datetime(&ends), TIME_to_ulonglong_datetime(&last_executed))); if (status == Event_timed::DISABLED) { DBUG_PRINT("compute_next_execution_time", ("Event %s is DISABLED", name.str)); goto ret; } /* If one-time, no need to do computation */ if (!expression) { /* Let's check whether it was executed */ if (last_executed.year) { DBUG_PRINT("info",("One-time event %s.%s of was already executed", dbname.str, name.str, definer.str)); dropped= (on_completion == Event_timed::ON_COMPLETION_DROP); DBUG_PRINT("info",("One-time event will be dropped=%d.", dropped)); status= Event_timed::DISABLED; status_changed= true; } goto ret; } my_tz_UTC->gmt_sec_to_TIME(&time_now, current_thd->query_start()); DBUG_PRINT("info",("NOW=[%llu]", TIME_to_ulonglong_datetime(&time_now))); /* if time_now is after ends don't execute anymore */ if (!ends_null && (tmp= my_time_compare(&ends, &time_now)) == -1) { DBUG_PRINT("info", ("NOW after ENDS, don't execute anymore")); /* time_now is after ends. don't execute anymore */ set_zero_time(&execute_at, MYSQL_TIMESTAMP_DATETIME); execute_at_null= TRUE; if (on_completion == Event_timed::ON_COMPLETION_DROP) dropped= true; DBUG_PRINT("info", ("Dropped=%d", dropped)); status= Event_timed::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 && (tmp= my_time_compare(&time_now, &starts)) < 1) { if (tmp == 0 && my_time_compare(&starts, &last_executed) == 0) { /* time_now = starts = last_executed do nothing or we will schedule for second time execution at starts. */ } else { DBUG_PRINT("info", ("STARTS is future, NOW <= STARTS,sched for STARTS")); /* starts is in the future time_now before starts. Scheduling for starts */ execute_at= starts; execute_at_null= FALSE; goto ret; } } if (!starts_null && !ends_null) { /* Both starts and m_ends are set and time_now is between them (incl.) If last_executed is set then increase with m_expression. The new TIME is after m_ends set execute_at to 0. And check for on_completion If not set then schedule for now. */ DBUG_PRINT("info", ("Both STARTS & ENDS are set")); if (!last_executed.year) { DBUG_PRINT("info", ("Not executed so far.")); } { TIME next_exec; if (get_next_time(&next_exec, &starts, &time_now, last_executed.year? &last_executed:&starts, expression, interval)) goto err; /* There was previous execution */ if (my_time_compare(&ends, &next_exec) == -1) { DBUG_PRINT("info", ("Next execution of %s after ENDS. Stop executing.", name.str)); /* Next execution after ends. No more executions */ set_zero_time(&execute_at, MYSQL_TIMESTAMP_DATETIME); execute_at_null= TRUE; if (on_completion == Event_timed::ON_COMPLETION_DROP) dropped= true; status= Event_timed::DISABLED; status_changed= true; } else { DBUG_PRINT("info",("Next[%llu]",TIME_to_ulonglong_datetime(&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.year) { TIME next_exec; if (get_next_time(&next_exec, &starts, &time_now, &last_executed, expression, interval)) goto err; execute_at= next_exec; DBUG_PRINT("info",("Next[%llu]",TIME_to_ulonglong_datetime(&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.year) { DBUG_PRINT("info", ("Not executed so far.")); } { TIME next_exec; if (get_next_time(&next_exec, &starts, &time_now, last_executed.year? &last_executed:&starts, expression, interval)) goto err; execute_at= next_exec; DBUG_PRINT("info",("Next[%llu]",TIME_to_ulonglong_datetime(&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.year) execute_at= time_now; else { TIME next_exec; if (get_next_time(&next_exec, &starts, &time_now, &last_executed, expression, interval)) goto err; if (my_time_compare(&ends, &next_exec) == -1) { DBUG_PRINT("info", ("Next execution after ENDS. Stop executing.")); set_zero_time(&execute_at, MYSQL_TIMESTAMP_DATETIME); execute_at_null= TRUE; status= Event_timed::DISABLED; status_changed= true; if (on_completion == Event_timed::ON_COMPLETION_DROP) dropped= true; } else { DBUG_PRINT("info", ("Next[%llu]", TIME_to_ulonglong_datetime(&next_exec))); execute_at= next_exec; execute_at_null= FALSE; } } } goto ret; } ret: DBUG_PRINT("info", ("ret=0")); DBUG_RETURN(false); err: DBUG_PRINT("info", ("ret=1")); DBUG_RETURN(true); } /* Set the internal last_executed TIME struct to now. NOW is the time according to thd->query_start(), so the THD's clock. SYNOPSIS Event_timed::drop() thd thread context */ void Event_timed::mark_last_executed(THD *thd) { TIME time_now; thd->end_time(); my_tz_UTC->gmt_sec_to_TIME(&time_now, (my_time_t) thd->query_start()); last_executed= time_now; /* was execute_at */ last_executed_changed= true; } /* Drops the event SYNOPSIS Event_timed::drop() thd thread context RETURN VALUE 0 OK -1 Cannot open mysql.event -2 Cannot find the event in mysql.event (already deleted?) others return code from SE in case deletion of the event row failed. */ int Event_timed::drop(THD *thd) { uint tmp= 0; DBUG_ENTER("Event_timed::drop"); DBUG_RETURN(db_drop_event(thd, this, false, &tmp)); } /* Saves status and last_executed_at to the disk if changed. SYNOPSIS Event_timed::update_fields() thd - thread context RETURN VALUE 0 OK EVEX_OPEN_TABLE_FAILED Error while opening mysql.event for writing EVEX_WRITE_ROW_FAILED On error to write to disk others return code from SE in case deletion of the event row failed. */ bool Event_timed::update_fields(THD *thd) { TABLE *table; Open_tables_state backup; int ret; DBUG_ENTER("Event_timed::update_time_fields"); DBUG_PRINT("enter", ("name: %*s", name.length, name.str)); /* No need to update if nothing has changed */ if (!(status_changed || last_executed_changed)) DBUG_RETURN(0); thd->reset_n_backup_open_tables_state(&backup); if (Events::open_event_table(thd, TL_WRITE, &table)) { ret= EVEX_OPEN_TABLE_FAILED; goto done; } if ((ret= evex_db_find_event_by_name(thd, dbname, name, table))) goto done; store_record(table,record[1]); /* Don't update create on row update. */ table->timestamp_field_type= TIMESTAMP_NO_AUTO_SET; if (last_executed_changed) { table->field[Events::FIELD_LAST_EXECUTED]->set_notnull(); table->field[Events::FIELD_LAST_EXECUTED]->store_time(&last_executed, MYSQL_TIMESTAMP_DATETIME); last_executed_changed= false; } if (status_changed) { table->field[Events::FIELD_STATUS]->set_notnull(); table->field[Events::FIELD_STATUS]->store((longlong)status, true); status_changed= false; } if ((table->file->ha_update_row(table->record[1],table->record[0]))) ret= EVEX_WRITE_ROW_FAILED; done: close_thread_tables(thd); thd->restore_backup_open_tables_state(&backup); DBUG_RETURN(ret); } /* Get SHOW CREATE EVENT as string 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) { int multipl= 0; char tmp_buff[128]; String expr_buf(tmp_buff, sizeof(tmp_buff), system_charset_info); expr_buf.length(0); DBUG_ENTER("get_create_event"); DBUG_PRINT("ret_info",("body_len=[%d]body=[%s]", body.length, body.str)); if (expression && 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); buf->append(STRING_WITH_LEN(" ON SCHEDULE ")); if (expression) { buf->append(STRING_WITH_LEN("EVERY ")); buf->append(expr_buf); buf->append(' '); LEX_STRING *ival= &interval_type_to_name[interval]; buf->append(ival->str, ival->length); } else { char dtime_buff[20*2+32];/* +32 to make my_snprintf_{8bit|ucs2} happy */ buf->append(STRING_WITH_LEN("AT '")); /* Pass the buffer and the second param tells fills the buffer and returns the number of chars to copy. */ buf->append(dtime_buff, my_datetime_to_str(&execute_at, dtime_buff)); buf->append(STRING_WITH_LEN("'")); } if (on_completion == Event_timed::ON_COMPLETION_DROP) buf->append(STRING_WITH_LEN(" ON COMPLETION NOT PRESERVE ")); else buf->append(STRING_WITH_LEN(" ON COMPLETION PRESERVE ")); if (status == Event_timed::ENABLED) buf->append(STRING_WITH_LEN("ENABLE")); else buf->append(STRING_WITH_LEN("DISABLE")); if (comment.length) { buf->append(STRING_WITH_LEN(" COMMENT ")); append_unescaped(buf, comment.str, comment.length); } buf->append(STRING_WITH_LEN(" DO ")); buf->append(body.str, body.length); DBUG_RETURN(0); } /* Executes the event (the underlying sp_head object); SYNOPSIS evex_fill_row() thd THD mem_root If != NULL use it to compile the event on it RETURN VALUE 0 success -99 No rights on this.dbname.str -100 event in execution (parallel execution is impossible) others retcodes of sp_head::execute_procedure() */ int Event_timed::execute(THD *thd, MEM_ROOT *mem_root) { /* this one is local and not needed after exec */ Security_context security_ctx; int ret= 0; DBUG_ENTER("Event_timed::execute"); DBUG_PRINT("info", (" EVEX EXECUTING event %s.%s [EXPR:%d]", dbname.str, name.str, (int) expression)); VOID(pthread_mutex_lock(&this->LOCK_running)); if (running) { VOID(pthread_mutex_unlock(&this->LOCK_running)); DBUG_RETURN(-100); } running= true; VOID(pthread_mutex_unlock(&this->LOCK_running)); if (!sphead && (ret= compile(thd, mem_root))) goto done; /* THD::~THD will clean this or if there is DROP DATABASE in the SP then it will be free there. It should not point to our buffer which is allocated on a mem_root. */ thd->db= my_strdup(dbname.str, MYF(0)); thd->db_length= dbname.length; if (!check_access(thd, EVENT_ACL,dbname.str, 0, 0, 0,is_schema_db(dbname.str))) { List empty_item_list; empty_item_list.empty(); if (thd->enable_slow_log) sphead->m_flags|= sp_head::LOG_SLOW_STATEMENTS; sphead->m_flags|= sp_head::LOG_GENERAL_LOG; ret= sphead->execute_procedure(thd, &empty_item_list); } else { DBUG_PRINT("error", ("%s@%s has no rights on %s", definer_user.str, definer_host.str, dbname.str)); ret= -99; } VOID(pthread_mutex_lock(&this->LOCK_running)); running= false; /* Will compile every time a new sp_head on different root */ free_sp(); VOID(pthread_mutex_unlock(&this->LOCK_running)); done: /* 1. Don't cache sphead if allocated on another mem_root 2. Don't call security_ctx.destroy() because this will free our dbname.str name.str and definer.str */ if (mem_root && sphead) { delete sphead; sphead= 0; } DBUG_PRINT("info", (" EVEX EXECUTED event %s.%s [EXPR:%d]. RetCode=%d", dbname.str, name.str, (int) expression, ret)); DBUG_RETURN(ret); } /* Frees the memory of the sp_head object we hold SYNOPSIS Event_timed::free_sp() */ void Event_timed::free_sp() { delete sphead; sphead= 0; } /* Compiles an event before it's execution. Compiles the anonymous sp_head object held by the event SYNOPSIS Event_timed::compile() thd thread context, used for memory allocation mostly mem_root if != NULL then this memory root is used for allocs instead of thd->mem_root RETURN VALUE 0 success EVEX_COMPILE_ERROR error during compilation EVEX_MICROSECOND_UNSUP mysql.event was tampered */ int Event_timed::compile(THD *thd, MEM_ROOT *mem_root) { int ret= 0; MEM_ROOT *tmp_mem_root= 0; LEX *old_lex= thd->lex, lex; char *old_db; int old_db_length; char *old_query; uint old_query_len; ulong old_sql_mode= thd->variables.sql_mode; char create_buf[2048]; String show_create(create_buf, sizeof(create_buf), system_charset_info); CHARSET_INFO *old_character_set_client, *old_collation_connection, *old_character_set_results; Security_context *save_ctx; /* this one is local and not needed after exec */ Security_context security_ctx; DBUG_ENTER("Event_timed::compile"); show_create.length(0); switch (get_create_event(thd, &show_create)) { case EVEX_MICROSECOND_UNSUP: sql_print_error("Scheduler"); DBUG_RETURN(EVEX_MICROSECOND_UNSUP); case 0: break; default: DBUG_ASSERT(0); } old_character_set_client= thd->variables.character_set_client; old_character_set_results= thd->variables.character_set_results; old_collation_connection= thd->variables.collation_connection; thd->variables.character_set_client= thd->variables.character_set_results= thd->variables.collation_connection= get_charset_by_csname("utf8", MY_CS_PRIMARY, MYF(MY_WME)); thd->update_charset(); DBUG_PRINT("info",("old_sql_mode=%d new_sql_mode=%d",old_sql_mode, sql_mode)); thd->variables.sql_mode= this->sql_mode; /* Change the memory root for the execution time */ if (mem_root) { tmp_mem_root= thd->mem_root; thd->mem_root= mem_root; } old_query_len= thd->query_length; old_query= thd->query; old_db= thd->db; old_db_length= thd->db_length; thd->db= dbname.str; thd->db_length= dbname.length; thd->query= show_create.c_ptr(); thd->query_length= show_create.length(); DBUG_PRINT("info", ("query:%s",thd->query)); change_security_context(thd, definer_user, definer_host, dbname, &security_ctx, &save_ctx); thd->lex= &lex; lex_start(thd, (uchar*)thd->query, thd->query_length); lex.et_compile_phase= TRUE; if (MYSQLparse((void *)thd) || thd->is_fatal_error) { DBUG_PRINT("error", ("error during compile or thd->is_fatal_error=%d", thd->is_fatal_error)); /* Free lex associated resources QQ: Do we really need all this stuff here? */ sql_print_error("error during compile of %s.%s or thd->is_fatal_error=%d", dbname.str, name.str, thd->is_fatal_error); if (lex.sphead) { if (&lex != thd->lex) thd->lex->sphead->restore_lex(thd); delete lex.sphead; lex.sphead= 0; } ret= EVEX_COMPILE_ERROR; goto done; } DBUG_PRINT("note", ("success compiling %s.%s", dbname.str, name.str)); sphead= lex.et->sphead; sphead->m_db= dbname; sphead->set_definer(definer.str, definer.length); sphead->set_info(0, 0, &lex.sp_chistics, sql_mode); sphead->optimize(); ret= 0; done: lex.et->free_sphead_on_delete= false; lex.et->deinit_mutexes(); lex_end(&lex); restore_security_context(thd, save_ctx); DBUG_PRINT("note", ("return old data on its place. set back NAMES")); thd->lex= old_lex; thd->query= old_query; thd->query_length= old_query_len; thd->db= old_db; thd->variables.sql_mode= old_sql_mode; thd->variables.character_set_client= old_character_set_client; thd->variables.character_set_results= old_character_set_results; thd->variables.collation_connection= old_collation_connection; thd->update_charset(); /* Change the memory root for the execution time. */ if (mem_root) thd->mem_root= tmp_mem_root; DBUG_RETURN(ret); } extern pthread_attr_t connection_attrib; /* Checks whether is possible and forks a thread. Passes self as argument. RETURN VALUE EVENT_EXEC_STARTED OK EVENT_EXEC_ALREADY_EXEC Thread not forked, already working EVENT_EXEC_CANT_FORK Unable to spawn thread (error) */ int Event_timed::spawn_now(void * (*thread_func)(void*), void *arg) { THD *thd= current_thd; int ret= EVENT_EXEC_STARTED; DBUG_ENTER("Event_timed::spawn_now"); DBUG_PRINT("info", ("[%s.%s]", dbname.str, name.str)); VOID(pthread_mutex_lock(&this->LOCK_running)); DBUG_PRINT("info", ("SCHEDULER: execute_at of %s is %lld", name.str, TIME_to_ulonglong_datetime(&execute_at))); mark_last_executed(thd); if (compute_next_execution_time()) { sql_print_error("SCHEDULER: Error while computing time of %s.%s . " "Disabling after execution.", dbname.str, name.str); status= DISABLED; } DBUG_PRINT("evex manager", ("[%10s] next exec at [%llu]", name.str, TIME_to_ulonglong_datetime(&execute_at))); /* 1. For one-time event : year is > 0 and expression is 0 2. For recurring, expression is != -=> check execute_at_null in this case */ if ((execute_at.year && !expression) || execute_at_null) { sql_print_information("SCHEDULER: [%s.%s of %s] no more executions " "after this one", dbname.str, name.str, definer.str); flags |= EVENT_EXEC_NO_MORE | EVENT_FREE_WHEN_FINISHED; } update_fields(thd); if (!in_spawned_thread) { pthread_t th; in_spawned_thread= true; if (pthread_create(&th, &connection_attrib, thread_func, arg)) { DBUG_PRINT("info", ("problem while spawning thread")); ret= EVENT_EXEC_CANT_FORK; in_spawned_thread= false; } } else { DBUG_PRINT("info", ("already in spawned thread. skipping")); ret= EVENT_EXEC_ALREADY_EXEC; } VOID(pthread_mutex_unlock(&this->LOCK_running)); DBUG_RETURN(ret); } bool Event_timed::spawn_thread_finish(THD *thd) { bool should_free; DBUG_ENTER("Event_timed::spawn_thread_finish"); VOID(pthread_mutex_lock(&LOCK_running)); in_spawned_thread= false; DBUG_PRINT("info", ("Sending COND_finished for thread %d", thread_id)); thread_id= 0; if (dropped) drop(thd); pthread_cond_broadcast(&COND_finished); should_free= flags & EVENT_FREE_WHEN_FINISHED; VOID(pthread_mutex_unlock(&LOCK_running)); DBUG_RETURN(should_free); } /* Kills a running event SYNOPSIS Event_timed::kill_thread() RETURN VALUE 0 OK -1 EVEX_CANT_KILL !0 Error */ int Event_timed::kill_thread(THD *thd) { int ret= 0; DBUG_ENTER("Event_timed::kill_thread"); pthread_mutex_lock(&LOCK_running); DBUG_PRINT("info", ("thread_id=%lu", thread_id)); if (thread_id == thd->thread_id) { /* We don't kill ourselves in cases like : alter event e_43 do alter event e_43 do set @a = 4 because we will never receive COND_finished. */ DBUG_PRINT("info", ("It's not safe to kill ourselves in self altering queries")); ret= EVEX_CANT_KILL; } else if (thread_id && !(ret= kill_one_thread(thd, thread_id, false))) { thd->enter_cond(&COND_finished, &LOCK_running, "Waiting for finished"); DBUG_PRINT("info", ("Waiting for COND_finished from thread %d", thread_id)); while (thread_id) pthread_cond_wait(&COND_finished, &LOCK_running); DBUG_PRINT("info", ("Got COND_finished")); /* This will implicitly unlock LOCK_running. Hence we return before that */ thd->exit_cond(""); DBUG_RETURN(0); } else if (!thread_id && in_spawned_thread) { /* Because the manager thread waits for the forked thread to update thread_id this situation is impossible. */ DBUG_ASSERT(0); } pthread_mutex_unlock(&LOCK_running); DBUG_PRINT("exit", ("%d", ret)); DBUG_RETURN(ret); } /* Checks whether two events have the same name SYNOPSIS event_timed_name_equal() RETURN VALUE TRUE names are equal FALSE names are not equal */ bool event_timed_name_equal(Event_timed *et, LEX_STRING *name) { return !sortcmp_lex_string(et->name, *name, system_charset_info); } /* Checks whether two events are in the same schema SYNOPSIS event_timed_db_equal() RETURN VALUE TRUE schemas are equal FALSE schemas are not equal */ bool event_timed_db_equal(Event_timed *et, LEX_STRING *db) { return !sortcmp_lex_string(et->dbname, *db, system_charset_info); } /* Checks whether two events have the same definer SYNOPSIS event_timed_definer_equal() Returns TRUE definers are equal FALSE definers are not equal */ bool event_timed_definer_equal(Event_timed *et, LEX_STRING *definer) { return !sortcmp_lex_string(et->definer, *definer, system_charset_info); } /* Checks whether two events are equal by identifiers SYNOPSIS event_timed_identifier_equal() RETURN VALUE TRUE equal FALSE not equal */ bool event_timed_identifier_equal(Event_timed *a, Event_timed *b) { return event_timed_name_equal(a, &b->name) && event_timed_db_equal(a, &b->dbname) && event_timed_definer_equal(a, &b->definer); } /* Switches the security context SYNOPSIS change_security_context() thd Thread user The user host The host of the user db The schema for which the security_ctx will be loaded s_ctx Security context to load state into backup Where to store the old context RETURN VALUE 0 - OK 1 - Error (generates error too) */ bool change_security_context(THD *thd, LEX_STRING user, LEX_STRING host, LEX_STRING db, Security_context *s_ctx, Security_context **backup) { DBUG_ENTER("change_security_context"); DBUG_PRINT("info",("%s@%s@%s", user.str, host.str, db.str)); #ifndef NO_EMBEDDED_ACCESS_CHECKS s_ctx->init(); *backup= 0; if (acl_getroot_no_password(s_ctx, user.str, host.str, host.str, db.str)) { my_error(ER_NO_SUCH_USER, MYF(0), user.str, host.str); DBUG_RETURN(TRUE); } *backup= thd->security_ctx; thd->security_ctx= s_ctx; #endif DBUG_RETURN(FALSE); } /* Restores the security context SYNOPSIS restore_security_context() thd - thread backup - switch to this context */ void restore_security_context(THD *thd, Security_context *backup) { DBUG_ENTER("restore_security_context"); #ifndef NO_EMBEDDED_ACCESS_CHECKS if (backup) thd->security_ctx= backup; #endif DBUG_VOID_RETURN; }