/* Copyright (C) 2004-2005 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 */ #include "event_priv.h" #include "event.h" #include "sp.h" /* TODO list : - The default value of created/modified should not be 0000-00-00 because of STRICT mode restricions. - CREATE EVENT should not go into binary log! Does it now? The SQL statements issued by the EVENT are replicated. I have an idea how to solve the problem at failover. So the status field will be ENUM('DISABLED', 'ENABLED', 'SLAVESIDE_DISABLED'). In this case when CREATE EVENT is replicated it should go into the binary as SLAVESIDE_DISABLED if it is ENABLED, when it's created as DISABLEd it should be replicated as disabled. If an event is ALTERed as DISABLED the query should go untouched into the binary log, when ALTERed as enable then it should go as SLAVESIDE_DISABLED. This is regarding the SQL interface. TT routines however modify mysql.event internally and this does not go the log so in this case queries has to be injected into the log...somehow... or maybe a solution is RBR for this case, because the event may go only from ENABLED to DISABLED status change and this is safe for replicating. As well an event may be deleted which is also safe for RBR. - Maybe move all allocations during parsing to evex_mem_root thus saving double parsing in evex_create_event! - If the server is killed (stopping) try to kill executing events? - What happens if one renames an event in the DB while it is in memory? Or even deleting it? - Consider using conditional variable when doing shutdown instead of waiting till all worker threads end. - Make event_timed::get_show_create_event() work - Add logging to file - Move comparison code to class event_timed Warning: - For now parallel execution is not possible because the same sp_head cannot be executed few times!!! There is still no lock attached to particular event. */ QUEUE EVEX_EQ_NAME; MEM_ROOT evex_mem_root; time_t mysql_event_last_create_time= 0L; static TABLE_FIELD_W_TYPE event_table_fields[EVEX_FIELD_COUNT] = { { {(char *) STRING_WITH_LEN("db")}, {(char *) STRING_WITH_LEN("char(64)")}, {(char *) STRING_WITH_LEN("utf8")} }, { {(char *) STRING_WITH_LEN("name")}, {(char *) STRING_WITH_LEN("char(64)")}, {(char *) STRING_WITH_LEN("utf8")} }, { {(char *) STRING_WITH_LEN("body")}, {(char *) STRING_WITH_LEN("longblob")}, {NULL, 0} }, { {(char *) STRING_WITH_LEN("definer")}, {(char *) STRING_WITH_LEN("char(77)")}, {(char *) STRING_WITH_LEN("utf8")} }, { {(char *) STRING_WITH_LEN("execute_at")}, {(char *) STRING_WITH_LEN("datetime")}, {NULL, 0} }, { {(char *) STRING_WITH_LEN("interval_value")}, {(char *) STRING_WITH_LEN("int(11)")}, {NULL, 0} }, { {(char *) STRING_WITH_LEN("interval_field")}, {(char *) STRING_WITH_LEN("enum('YEAR','QUARTER','MONTH','DAY'," "'HOUR','MINUTE','WEEK','SECOND','MICROSECOND','YEAR_MONTH','DAY_HOUR'," "'DAY_MINUTE','DAY_SECOND','HOUR_MINUTE','HOUR_SECOND','MINUTE_SECOND'," "'DAY_MICROSECOND','HOUR_MICROSECOND','MINUTE_MICROSECOND'," "'SECOND_MICROSECOND')")}, {NULL, 0} }, { {(char *) STRING_WITH_LEN("created")}, {(char *) STRING_WITH_LEN("timestamp")}, {NULL, 0} }, { {(char *) STRING_WITH_LEN("modified")}, {(char *) STRING_WITH_LEN("timestamp")}, {NULL, 0} }, { {(char *) STRING_WITH_LEN("last_executed")}, {(char *) STRING_WITH_LEN("datetime")}, {NULL, 0} }, { {(char *) STRING_WITH_LEN("starts")}, {(char *) STRING_WITH_LEN("datetime")}, {NULL, 0} }, { {(char *) STRING_WITH_LEN("ends")}, {(char *) STRING_WITH_LEN("datetime")}, {NULL, 0} }, { {(char *) STRING_WITH_LEN("status")}, {(char *) STRING_WITH_LEN("enum('ENABLED','DISABLED')")}, {NULL, 0} }, { {(char *) STRING_WITH_LEN("on_completion")}, {(char *) STRING_WITH_LEN("enum('DROP','PRESERVE')")}, {NULL, 0} }, { {(char *) STRING_WITH_LEN("sql_mode")}, {(char *) STRING_WITH_LEN("set('REAL_AS_FLOAT','PIPES_AS_CONCAT','ANSI_QUOTES'," "'IGNORE_SPACE','NOT_USED','ONLY_FULL_GROUP_BY','NO_UNSIGNED_SUBTRACTION'," "'NO_DIR_IN_CREATE','POSTGRESQL','ORACLE','MSSQL','DB2','MAXDB'," "'NO_KEY_OPTIONS','NO_TABLE_OPTIONS','NO_FIELD_OPTIONS','MYSQL323','MYSQL40'," "'ANSI','NO_AUTO_VALUE_ON_ZERO','NO_BACKSLASH_ESCAPES','STRICT_TRANS_TABLES'," "'STRICT_ALL_TABLES','NO_ZERO_IN_DATE','NO_ZERO_DATE','INVALID_DATES'," "'ERROR_FOR_DIVISION_BY_ZERO','TRADITIONAL','NO_AUTO_CREATE_USER'," "'HIGH_NOT_PRECEDENCE')")}, {NULL, 0} }, { {(char *) STRING_WITH_LEN("comment")}, {(char *) STRING_WITH_LEN("char(64)")}, {(char *) STRING_WITH_LEN("utf8")} } }; LEX_STRING interval_type_to_name[] = { {(char *) STRING_WITH_LEN("YEAR")}, {(char *) STRING_WITH_LEN("QUARTER")}, {(char *) STRING_WITH_LEN("MONTH")}, {(char *) STRING_WITH_LEN("DAY")}, {(char *) STRING_WITH_LEN("HOUR")}, {(char *) STRING_WITH_LEN("MINUTE")}, {(char *) STRING_WITH_LEN("WEEK")}, {(char *) STRING_WITH_LEN("SECOND")}, {(char *) STRING_WITH_LEN("MICROSECOND")}, {(char *) STRING_WITH_LEN("YEAR_MONTH")}, {(char *) STRING_WITH_LEN("DAY_HOUR")}, {(char *) STRING_WITH_LEN("DAY_MINUTE")}, {(char *) STRING_WITH_LEN("DAY_SECOND")}, {(char *) STRING_WITH_LEN("HOUR_MINUTE")}, {(char *) STRING_WITH_LEN("HOUR_SECOND")}, {(char *) STRING_WITH_LEN("MINUTE_SECOND")}, {(char *) STRING_WITH_LEN("DAY_MICROSECOND")}, {(char *) STRING_WITH_LEN("HOUR_MICROSECOND")}, {(char *) STRING_WITH_LEN("MINUTE_MICROSECOND")}, {(char *) STRING_WITH_LEN("SECOND_MICROSECOND")} }; /* Inits the scheduler queue - prioritized queue from mysys/queue.c Synopsis evex_queue_init() queue - pointer the the memory to be initialized as queue. has to be allocated from the caller Notes During initialization the queue is sized for 30 events, and when is full will auto extent with 30. */ void evex_queue_init(EVEX_QUEUE_TYPE *queue) { if (init_queue_ex(queue, 30 /*num_el*/, 0 /*offset*/, 0 /*smallest_on_top*/, event_timed_compare_q, NULL, 30 /*auto_extent*/)) sql_print_error("Insufficient memory to initialize executing queue."); } /* Compares 2 LEX strings regarding case. Synopsis my_time_compare() s - first LEX_STRING t - second LEX_STRING cs - charset RETURNS: -1 - s < t 0 - s == t 1 - s > t Notes TIME.second_part is not considered during comparison */ int sortcmp_lex_string(LEX_STRING s, LEX_STRING t, CHARSET_INFO *cs) { return cs->coll->strnncollsp(cs, (unsigned char *) s.str,s.length, (unsigned char *) t.str,t.length, 0); } /* Compares 2 TIME structures Synopsis my_time_compare() a - first TIME b - second time RETURNS: -1 - a < b 0 - a == b 1 - a > b Notes TIME.second_part is not considered during comparison */ int my_time_compare(TIME *a, TIME *b) { #ifdef ENABLE_WHEN_WE_HAVE_MILLISECOND_IN_TIMESTAMPS my_ulonglong a_t= TIME_to_ulonglong_datetime(a)*100L + a->second_part; my_ulonglong b_t= TIME_to_ulonglong_datetime(b)*100L + b->second_part; #else my_ulonglong a_t= TIME_to_ulonglong_datetime(a); my_ulonglong b_t= TIME_to_ulonglong_datetime(b); #endif if (a_t > b_t) return 1; else if (a_t < b_t) return -1; return 0; } /* Compares the execute_at members of 2 event_timed instances Synopsis event_timed_compare() a - first event_timed object b - second event_timed object RETURNS: -1 - a->execute_at < b->execute_at 0 - a->execute_at == b->execute_at 1 - a->execute_at > b->execute_at Notes execute_at.second_part is not considered during comparison */ int event_timed_compare(event_timed *a, event_timed *b) { return my_time_compare(&a->execute_at, &b->execute_at); } /* Compares the execute_at members of 2 event_timed instances. Used as callback for the prioritized queue when shifting elements inside. Synopsis event_timed_compare() vptr - not used (set it to NULL) a - first event_timed object b - second event_timed object RETURNS: -1 - a->execute_at < b->execute_at 0 - a->execute_at == b->execute_at 1 - a->execute_at > b->execute_at Notes execute_at.second_part is not considered during comparison */ int event_timed_compare_q(void *vptr, byte* a, byte *b) { return event_timed_compare((event_timed *)a, (event_timed *)b); } /* Reconstructs interval expression from interval type and expression value that is in form of a value of the smalles entity: For YEAR_MONTH - expression is in months DAY_MINUTE - expression is in minutes Synopsis event_reconstruct_interval_expression() buf - preallocated String buffer to add the value to interval - the interval type (for instance YEAR_MONTH) expression - the value in the lowest entity RETURNS 0 - OK 1 - Error */ int event_reconstruct_interval_expression(String *buf, interval_type interval, longlong expression) { ulonglong expr= expression; char tmp_buff[128], *end; bool close_quote= TRUE; int multipl= 0; char separator=':'; switch (interval) { case INTERVAL_YEAR_MONTH: multipl= 12; separator= '-'; goto common_1_lev_code; case INTERVAL_DAY_HOUR: multipl= 24; separator= ' '; goto common_1_lev_code; case INTERVAL_HOUR_MINUTE: case INTERVAL_MINUTE_SECOND: multipl= 60; common_1_lev_code: buf->append('\''); end= longlong10_to_str(expression/multipl, tmp_buff, 10); buf->append(tmp_buff, (uint) (end- tmp_buff)); expr= expr - (expr/multipl)*multipl; break; case INTERVAL_DAY_MINUTE: { int tmp_expr= expr; tmp_expr/=(24*60); buf->append('\''); end= longlong10_to_str(tmp_expr, tmp_buff, 10); buf->append(tmp_buff, (uint) (end- tmp_buff));// days buf->append(' '); tmp_expr= expr - tmp_expr*(24*60);//minutes left end= longlong10_to_str(tmp_expr/60, tmp_buff, 10); buf->append(tmp_buff, (uint) (end- tmp_buff));// hours expr= tmp_expr - (tmp_expr/60)*60; /* the code after the switch will finish */ } break; case INTERVAL_HOUR_SECOND: { int tmp_expr= expr; buf->append('\''); end= longlong10_to_str(tmp_expr/3600, tmp_buff, 10); buf->append(tmp_buff, (uint) (end- tmp_buff));// hours buf->append(':'); tmp_expr= tmp_expr - (tmp_expr/3600)*3600; end= longlong10_to_str(tmp_expr/60, tmp_buff, 10); buf->append(tmp_buff, (uint) (end- tmp_buff));// minutes expr= tmp_expr - (tmp_expr/60)*60; /* the code after the switch will finish */ } break; case INTERVAL_DAY_SECOND: { int tmp_expr= expr; tmp_expr/=(24*3600); buf->append('\''); end= longlong10_to_str(tmp_expr, tmp_buff, 10); buf->append(tmp_buff, (uint) (end- tmp_buff));// days buf->append(' '); tmp_expr= expr - tmp_expr*(24*3600);//seconds left end= longlong10_to_str(tmp_expr/3600, tmp_buff, 10); buf->append(tmp_buff, (uint) (end- tmp_buff));// hours buf->append(':'); tmp_expr= tmp_expr - (tmp_expr/3600)*3600; end= longlong10_to_str(tmp_expr/60, tmp_buff, 10); buf->append(tmp_buff, (uint) (end- tmp_buff));// minutes expr= tmp_expr - (tmp_expr/60)*60; /* the code after the switch will finish */ } break; case INTERVAL_DAY_MICROSECOND: case INTERVAL_HOUR_MICROSECOND: case INTERVAL_MINUTE_MICROSECOND: case INTERVAL_SECOND_MICROSECOND: case INTERVAL_MICROSECOND: my_error(ER_NOT_SUPPORTED_YET, MYF(0), "MICROSECOND"); return 1; break; case INTERVAL_QUARTER: expr/= 3; close_quote= FALSE; break; case INTERVAL_WEEK: expr/= 7; default: close_quote= FALSE; break; } if (close_quote) buf->append(separator); end= longlong10_to_str(expr, tmp_buff, 10); buf->append(tmp_buff, (uint) (end- tmp_buff)); if (close_quote) buf->append('\''); return 0; } /* Open mysql.event table for read SYNOPSIS evex_open_event_table_for_read() thd Thread context lock_type How to lock the table table The table pointer RETURN 1 Cannot lock table 2 The table is corrupted - different number of fields 0 OK */ int evex_open_event_table(THD *thd, enum thr_lock_type lock_type, TABLE **table) { TABLE_LIST tables; bool not_used; DBUG_ENTER("open_proc_table"); bzero((char*) &tables, sizeof(tables)); tables.db= (char*) "mysql"; tables.table_name= tables.alias= (char*) "event"; tables.lock_type= lock_type; if (simple_open_n_lock_tables(thd, &tables)) DBUG_RETURN(1); if (table_check_intact(tables.table, EVEX_FIELD_COUNT, event_table_fields, &mysql_event_last_create_time, ER_CANNOT_LOAD_FROM_TABLE)) { close_thread_tables(thd); DBUG_RETURN(2); } *table= tables.table; DBUG_RETURN(0); } /* Find row in open mysql.event table representing event SYNOPSIS evex_db_find_event_aux() thd Thread context et evet_timed object containing dbname, name & definer table TABLE object for open mysql.event table. RETURN VALUE 0 - Routine found EVEX_KEY_NOT_FOUND - No routine with given name */ inline int evex_db_find_event_aux(THD *thd, event_timed *et, TABLE *table) { return evex_db_find_event_by_name(thd, et->dbname, et->name, et->definer, table); } /* Find row in open mysql.event table representing event SYNOPSIS evex_db_find_event_by_name() thd Thread context dbname Name of event's database rname Name of the event inside the db table TABLE object for open mysql.event table. RETURN VALUE 0 - Routine found EVEX_KEY_NOT_FOUND - No routine with given name */ int evex_db_find_event_by_name(THD *thd, const LEX_STRING dbname, const LEX_STRING ev_name, const LEX_STRING user_name, TABLE *table) { byte key[MAX_KEY_LENGTH]; DBUG_ENTER("evex_db_find_event_by_name"); DBUG_PRINT("enter", ("name: %.*s", ev_name.length, ev_name.str)); /* Create key to find row. We have to use field->store() to be able to handle VARCHAR and CHAR fields. Assumption here is that the two first fields in the table are 'db' and 'name' and the first key is the primary key over the same fields. */ if (dbname.length > table->field[EVEX_FIELD_DB]->field_length || ev_name.length > table->field[EVEX_FIELD_NAME]->field_length || user_name.length > table->field[EVEX_FIELD_DEFINER]->field_length) DBUG_RETURN(EVEX_KEY_NOT_FOUND); table->field[EVEX_FIELD_DB]->store(dbname.str, dbname.length, &my_charset_bin); table->field[EVEX_FIELD_NAME]->store(ev_name.str, ev_name.length, &my_charset_bin); table->field[EVEX_FIELD_DEFINER]->store(user_name.str, user_name.length, &my_charset_bin); key_copy(key, table->record[0], table->key_info, table->key_info->key_length); if (table->file->index_read_idx(table->record[0], 0, key, table->key_info->key_length,HA_READ_KEY_EXACT)) DBUG_RETURN(EVEX_KEY_NOT_FOUND); DBUG_RETURN(0); } /* Puts some data common to CREATE and ALTER EVENT into a row. SYNOPSIS evex_fill_row() thd THD table the row to fill out et Event's data Returns 0 - ok EVEX_GENERAL_ERROR - bad data EVEX_GET_FIELD_FAILED - field count does not match. table corrupted? DESCRIPTION Used both when an event is created and when it is altered. */ static int evex_fill_row(THD *thd, TABLE *table, event_timed *et, my_bool is_update) { enum evex_table_field field_num; DBUG_ENTER("evex_fill_row"); DBUG_PRINT("info", ("dbname=[%s]", et->dbname.str)); DBUG_PRINT("info", ("name =[%s]", et->name.str)); DBUG_PRINT("info", ("body =[%s]", et->body.str)); if (table->field[field_num= EVEX_FIELD_DB]-> store(et->dbname.str, et->dbname.length, system_charset_info)) goto trunc_err; if (table->field[field_num= EVEX_FIELD_NAME]-> store(et->name.str, et->name.length, system_charset_info)) goto trunc_err; /* both ON_COMPLETION and STATUS are NOT NULL thus not calling set_notnull() */ table->field[EVEX_FIELD_ON_COMPLETION]->store((longlong)et->on_completion); table->field[EVEX_FIELD_STATUS]->store((longlong)et->status); /* Change the SQL_MODE only if body was present in an ALTER EVENT and of course always during CREATE EVENT. */ if (et->body.str) { table->field[EVEX_FIELD_SQL_MODE]->store((longlong)thd->variables.sql_mode); if (table->field[field_num= EVEX_FIELD_BODY]-> store(et->body.str, et->body.length, system_charset_info)) goto trunc_err; } if (et->expression) { table->field[EVEX_FIELD_INTERVAL_EXPR]->set_notnull(); table->field[EVEX_FIELD_INTERVAL_EXPR]->store((longlong)et->expression); table->field[EVEX_FIELD_TRANSIENT_INTERVAL]->set_notnull(); /* In the enum (C) intervals start from 0 but in mysql enum valid values start from 1. Thus +1 offset is needed! */ table->field[EVEX_FIELD_TRANSIENT_INTERVAL]->store((longlong)et->interval+1); table->field[EVEX_FIELD_EXECUTE_AT]->set_null(); if (!et->starts_null) { table->field[EVEX_FIELD_STARTS]->set_notnull(); table->field[EVEX_FIELD_STARTS]-> store_time(&et->starts, MYSQL_TIMESTAMP_DATETIME); } if (!et->ends_null) { table->field[EVEX_FIELD_ENDS]->set_notnull(); table->field[EVEX_FIELD_ENDS]-> store_time(&et->ends, MYSQL_TIMESTAMP_DATETIME); } } else if (et->execute_at.year) { table->field[EVEX_FIELD_INTERVAL_EXPR]->set_null(); table->field[EVEX_FIELD_TRANSIENT_INTERVAL]->set_null(); table->field[EVEX_FIELD_STARTS]->set_null(); table->field[EVEX_FIELD_ENDS]->set_null(); table->field[EVEX_FIELD_EXECUTE_AT]->set_notnull(); table->field[EVEX_FIELD_EXECUTE_AT]->store_time(&et->execute_at, MYSQL_TIMESTAMP_DATETIME); } else { DBUG_ASSERT(is_update); /* it is normal to be here when the action is update this is an error if the action is create. something is borked */ } ((Field_timestamp *)table->field[EVEX_FIELD_MODIFIED])->set_time(); if (et->comment.str) { if (table->field[field_num= EVEX_FIELD_COMMENT]->store(et->comment.str, et->comment.length, system_charset_info)) goto trunc_err; } DBUG_RETURN(0); trunc_err: my_error(ER_EVENT_DATA_TOO_LONG, MYF(0), table->field[field_num]->field_name); DBUG_RETURN(EVEX_GENERAL_ERROR); } /* Creates an event in mysql.event SYNOPSIS db_create_event() thd THD et event_timed object containing information for the event create_if_not - if an warning should be generated in case event exists rows_affected - how many rows were affected Return value 0 - OK EVEX_GENERAL_ERROR - Failure DESCRIPTION Creates an event. Relies on evex_fill_row which is shared with db_update_event. The name of the event is inside "et". */ static int db_create_event(THD *thd, event_timed *et, my_bool create_if_not, uint *rows_affected) { int ret= 0; TABLE *table; char definer[HOSTNAME_LENGTH+USERNAME_LENGTH+2]; char olddb[128]; bool dbchanged= false; DBUG_ENTER("db_create_event"); DBUG_PRINT("enter", ("name: %.*s", et->name.length, et->name.str)); *rows_affected= 0; DBUG_PRINT("info", ("open mysql.event for update")); if (evex_open_event_table(thd, TL_WRITE, &table)) { my_error(ER_EVENT_OPEN_TABLE_FAILED, MYF(0)); goto err; } DBUG_PRINT("info", ("check existance of an event with the same name")); if (!evex_db_find_event_aux(thd, et, table)) { if (create_if_not) { push_warning_printf(thd, MYSQL_ERROR::WARN_LEVEL_NOTE, ER_EVENT_ALREADY_EXISTS, ER(ER_EVENT_ALREADY_EXISTS), et->name.str); goto ok; } my_error(ER_EVENT_ALREADY_EXISTS, MYF(0), et->name.str); goto err; } DBUG_PRINT("info", ("non-existant, go forward")); if ((ret= sp_use_new_db(thd, et->dbname.str,olddb, sizeof(olddb),0, &dbchanged))) { my_error(ER_BAD_DB_ERROR, MYF(0)); goto err; } restore_record(table, s->default_values); // Get default values for fields if (system_charset_info->cset->numchars(system_charset_info, et->dbname.str, et->dbname.str + et->dbname.length) > EVEX_DB_FIELD_LEN) { my_error(ER_TOO_LONG_IDENT, MYF(0), et->dbname.str); goto err; } if (system_charset_info->cset->numchars(system_charset_info, et->name.str, et->name.str + et->name.length) > EVEX_DB_FIELD_LEN) { my_error(ER_TOO_LONG_IDENT, MYF(0), et->name.str); goto err; } if (et->body.length > table->field[EVEX_FIELD_BODY]->field_length) { my_error(ER_TOO_LONG_BODY, MYF(0), et->name.str); goto err; } if (!(et->expression) && !(et->execute_at.year)) { DBUG_PRINT("error", ("neither expression nor execute_at are set!")); my_error(ER_EVENT_NEITHER_M_EXPR_NOR_M_AT, MYF(0)); goto err; } if ((ret=table->field[EVEX_FIELD_DEFINER]->store(et->definer.str, et->definer.length, system_charset_info))) { my_error(ER_EVENT_STORE_FAILED, MYF(0), et->name.str, ret); goto err; } ((Field_timestamp *)table->field[EVEX_FIELD_CREATED])->set_time(); /* evex_fill_row() calls my_error() in case of error so no need to handle it here */ if ((ret= evex_fill_row(thd, table, et, false))) goto err; if (table->file->ha_write_row(table->record[0])) { my_error(ER_EVENT_STORE_FAILED, MYF(0), et->name.str, ret); goto err; } #ifdef USE_THIS_CODE_AS_TEMPLATE_WHEN_EVENT_REPLICATION_IS_AGREED if (mysql_bin_log.is_open()) { thd->clear_error(); /* Such a statement can always go directly to binlog, no trans cache */ thd->binlog_query(THD::MYSQL_QUERY_TYPE, thd->query, thd->query_length, FALSE, FALSE); } #endif *rows_affected= 1; ok: if (dbchanged) (void) mysql_change_db(thd, olddb, 1); if (table) close_thread_tables(thd); DBUG_RETURN(EVEX_OK); err: if (dbchanged) (void) mysql_change_db(thd, olddb, 1); if (table) close_thread_tables(thd); DBUG_RETURN(EVEX_GENERAL_ERROR); } /* Used to execute ALTER EVENT. Pendant to evex_update_event(). SYNOPSIS db_update_event() thd THD sp_name the name of the event to alter et event's data NOTES sp_name is passed since this is the name of the event to alter in case of RENAME TO. */ static int db_update_event(THD *thd, event_timed *et, sp_name *new_name) { TABLE *table; int ret= EVEX_OPEN_TABLE_FAILED; DBUG_ENTER("db_update_event"); DBUG_PRINT("enter", ("dbname: %.*s", et->dbname.length, et->dbname.str)); DBUG_PRINT("enter", ("name: %.*s", et->name.length, et->name.str)); DBUG_PRINT("enter", ("user: %.*s", et->name.length, et->name.str)); if (new_name) DBUG_PRINT("enter", ("rename to: %.*s", new_name->m_name.length, new_name->m_name.str)); if (evex_open_event_table(thd, TL_WRITE, &table)) { my_error(ER_EVENT_OPEN_TABLE_FAILED, MYF(0)); goto err; } /* first look whether we overwrite */ if (new_name) { if (!sortcmp_lex_string(et->name, new_name->m_name, system_charset_info) && !sortcmp_lex_string(et->dbname, new_name->m_db, system_charset_info)) { my_error(ER_EVENT_SAME_NAME, MYF(0), et->name.str); goto err; } if (!evex_db_find_event_by_name(thd, new_name->m_db, new_name->m_name, et->definer, table)) { my_error(ER_EVENT_ALREADY_EXISTS, MYF(0), new_name->m_name.str); goto err; } } /* ...and then whether there is such an event. don't exchange the blocks because you will get error 120 from table handler because new_name will overwrite the key and SE will tell us that it cannot find the already found row (copied into record[1] later */ if (EVEX_KEY_NOT_FOUND == evex_db_find_event_aux(thd, et, table)) { my_error(ER_EVENT_DOES_NOT_EXIST, MYF(0), et->name.str); goto err; } store_record(table,record[1]); /* Don't update create on row update. */ table->timestamp_field_type= TIMESTAMP_NO_AUTO_SET; /* evex_fill_row() calls my_error() in case of error so no need to handle it here */ if ((ret= evex_fill_row(thd, table, et, true))) goto err; if (new_name) { table->field[EVEX_FIELD_DB]-> store(new_name->m_db.str, new_name->m_db.length, system_charset_info); table->field[EVEX_FIELD_NAME]-> store(new_name->m_name.str, new_name->m_name.length, system_charset_info); } if ((ret= table->file->ha_update_row(table->record[1], table->record[0]))) { my_error(ER_EVENT_STORE_FAILED, MYF(0), et->name.str, ret); goto err; } /* close mysql.event or we crash later when loading the event from disk */ close_thread_tables(thd); DBUG_RETURN(0); err: if (table) close_thread_tables(thd); DBUG_RETURN(EVEX_GENERAL_ERROR); } /* Looks for a named event in mysql.event and in case of success returns an object will data loaded from the table. SYNOPSIS db_find_event() thd THD name the name of the event to find definer who owns the event ett event's data if event is found tbl TABLE object to use when not NULL NOTES 1) Use sp_name for look up, return in **ett if found 2) tbl is not closed at exit */ static int db_find_event(THD *thd, sp_name *name, LEX_STRING *definer, event_timed **ett, TABLE *tbl, MEM_ROOT *root) { TABLE *table; int ret; char *ptr; event_timed *et=NULL; DBUG_ENTER("db_find_event"); DBUG_PRINT("enter", ("name: %*s", name->m_name.length, name->m_name.str)); if (!root) root= &evex_mem_root; if (tbl) table= tbl; else if (evex_open_event_table(thd, TL_READ, &table)) { my_error(ER_EVENT_OPEN_TABLE_FAILED, MYF(0)); ret= EVEX_GENERAL_ERROR; goto done; } if ((ret= evex_db_find_event_by_name(thd, name->m_db, name->m_name, *definer, table))) { my_error(ER_EVENT_DOES_NOT_EXIST, MYF(0), name->m_name.str); goto done; } et= new event_timed; /* 1)The table should not be closed beforehand. ::load_from_row() only loads and does not compile 2)::load_from_row() is silent on error therefore we emit error msg here */ if ((ret= et->load_from_row(root, table))) { my_error(ER_CANNOT_LOAD_FROM_TABLE, MYF(0)); goto done; } done: if (ret && et) { delete et; et= 0; } /* don't close the table if we haven't opened it ourselves */ if (!tbl && table) close_thread_tables(thd); *ett= et; DBUG_RETURN(ret); } /* Looks for a named event in mysql.event and then loads it from the table, compiles it and insert it into the cache. SYNOPSIS evex_load_and_compile_event() thd THD spn the name of the event to alter definer who is the owner use_lock whether to obtain a lock on LOCK_event_arrays or not RETURN VALUE 0 - OK < 0 - error (in this case underlying functions call my_error()). */ static int evex_load_and_compile_event(THD * thd, sp_name *spn, LEX_STRING definer, bool use_lock) { int ret= 0; MEM_ROOT *tmp_mem_root; event_timed *ett; Open_tables_state backup; DBUG_ENTER("db_load_and_compile_event"); DBUG_PRINT("enter", ("name: %*s", spn->m_name.length, spn->m_name.str)); tmp_mem_root= thd->mem_root; thd->mem_root= &evex_mem_root; thd->reset_n_backup_open_tables_state(&backup); /* no need to use my_error() here because db_find_event() has done it */ ret= db_find_event(thd, spn, &definer, &ett, NULL, NULL); thd->restore_backup_open_tables_state(&backup); if (ret) goto done; /* allocate on evex_mem_root. if you call without evex_mem_root then sphead will not be cleared! */ if ((ret= ett->compile(thd, &evex_mem_root))) goto done; ett->compute_next_execution_time(); if (use_lock) VOID(pthread_mutex_lock(&LOCK_event_arrays)); evex_queue_insert(&EVEX_EQ_NAME, (EVEX_PTOQEL) ett); /* There is a copy in the array which we don't need. sphead won't be destroyed. */ if (use_lock) VOID(pthread_mutex_unlock(&LOCK_event_arrays)); done: if (thd->mem_root != tmp_mem_root) thd->mem_root= tmp_mem_root; DBUG_RETURN(ret); } /* Removes from queue in memory the event which is identified by the tupple (db, name). SYNOPSIS evex_remove_from_cache() db - db name name - event name use_lock - whether to lock the mutex LOCK_event_arrays or not in case it has been already locked outside is_drop - if an event is currently being executed then we can also delete the event_timed instance, so we alarm the event that it should drop itself if this parameter is set to TRUE. It's false on ALTER EVENT. RETURNS 0 OK (always) */ static int evex_remove_from_cache(LEX_STRING *db, LEX_STRING *name, bool use_lock, bool is_drop) { //ToDo : Add definer to the tuple (db, name) to become triple uint i; int ret= 0; DBUG_ENTER("evex_remove_from_cache"); /* It is possible that 2 (or 1) pass(es) won't find the event in memory. The reason is that DISABLED events are not cached. */ if (use_lock) VOID(pthread_mutex_lock(&LOCK_event_arrays)); for (i= 0; i < evex_queue_num_elements(EVEX_EQ_NAME); ++i) { event_timed *et= evex_queue_element(&EVEX_EQ_NAME, i, event_timed*); DBUG_PRINT("info", ("[%s.%s]==[%s.%s]?",db->str,name->str, et->dbname.str, et->name.str)); if (!sortcmp_lex_string(*name, et->name, system_charset_info) && !sortcmp_lex_string(*db, et->dbname, system_charset_info)) { if (et->can_spawn_now()) { DBUG_PRINT("evex_remove_from_cache", ("not running - free and delete")); et->free_sp(); delete et; } else { DBUG_PRINT("evex_remove_from_cache", ("running.defer mem free. is_drop=%d", is_drop)); et->flags|= EVENT_EXEC_NO_MORE; et->dropped= is_drop; } DBUG_PRINT("evex_remove_from_cache", ("delete from queue")); evex_queue_delete_element(&EVEX_EQ_NAME, i); /* ok, we have cleaned */ ret= 0; goto done; } } done: if (use_lock) VOID(pthread_mutex_unlock(&LOCK_event_arrays)); DBUG_RETURN(ret); } /* The function exported to the world for creating of events. SYNOPSIS evex_create_event() thd THD et event's data create_options Options specified when in the query. We are interested whether there is IF NOT EXISTS rows_affected How many rows were affected NOTES - in case there is an event with the same name (db) and IF NOT EXISTS is specified, an warning is put into the W stack. */ int evex_create_event(THD *thd, event_timed *et, uint create_options, uint *rows_affected) { int ret = 0; DBUG_ENTER("evex_create_event"); DBUG_PRINT("enter", ("name: %*s options:%d", et->name.length, et->name.str, create_options)); if ((ret = db_create_event(thd, et, create_options & HA_LEX_CREATE_IF_NOT_EXISTS, rows_affected))) goto done; VOID(pthread_mutex_lock(&LOCK_evex_running)); if (evex_is_running && et->status == MYSQL_EVENT_ENABLED) { sp_name spn(et->dbname, et->name); ret= evex_load_and_compile_event(thd, &spn, et->definer, true); } VOID(pthread_mutex_unlock(&LOCK_evex_running)); done: /* No need to close the table, it will be closed in sql_parse::do_command */ DBUG_RETURN(ret); } /* The function exported to the world for alteration of events. SYNOPSIS evex_update_event() thd THD et event's data new_name set in case of RENAME TO. NOTES et contains data about dbname and event name. new_name is the new name of the event, if not null (this means that RENAME TO was specified in the query) */ int evex_update_event(THD *thd, event_timed *et, sp_name *new_name, uint *rows_affected) { int ret, i; bool need_second_pass= true; DBUG_ENTER("evex_update_event"); DBUG_PRINT("enter", ("name: %*s", et->name.length, et->name.str)); /* db_update_event() opens & closes the table to prevent crash later in the code when loading and compiling the new definition. Also on error conditions my_error() is called so no need to handle here */ if ((ret= db_update_event(thd, et, new_name))) goto done; VOID(pthread_mutex_lock(&LOCK_evex_running)); if (!evex_is_running) UNLOCK_MUTEX_AND_BAIL_OUT(LOCK_evex_running, done); VOID(pthread_mutex_lock(&LOCK_event_arrays)); evex_remove_from_cache(&et->dbname, &et->name, false, false); if (et->status == MYSQL_EVENT_ENABLED) { if (new_name) ret= evex_load_and_compile_event(thd, new_name, et->definer, false); else { sp_name spn(et->dbname, et->name); ret= evex_load_and_compile_event(thd, &spn, et->definer, false); } if (ret == EVEX_COMPILE_ERROR) my_error(ER_EVENT_COMPILE_ERROR, MYF(0)); } VOID(pthread_mutex_unlock(&LOCK_event_arrays)); VOID(pthread_mutex_unlock(&LOCK_evex_running)); done: DBUG_RETURN(ret); } /* Drops an event SYNOPSIS db_drop_event() thd THD et event's name drop_if_exists if set and the event not existing => warning onto the stack rows_affected affected number of rows is returned heres */ int db_drop_event(THD *thd, event_timed *et, bool drop_if_exists, uint *rows_affected) { TABLE *table; Open_tables_state backup; int ret; DBUG_ENTER("db_drop_event"); ret= EVEX_OPEN_TABLE_FAILED; thd->reset_n_backup_open_tables_state(&backup); if (evex_open_event_table(thd, TL_WRITE, &table)) { my_error(ER_EVENT_OPEN_TABLE_FAILED, MYF(0)); goto done; } if (!(ret= evex_db_find_event_aux(thd, et, table))) { if ((ret= table->file->ha_delete_row(table->record[0]))) { my_error(ER_EVENT_CANNOT_DELETE, MYF(0)); goto done; } } else if (ret == EVEX_KEY_NOT_FOUND) { if (drop_if_exists) { push_warning_printf(thd, MYSQL_ERROR::WARN_LEVEL_NOTE, ER_SP_DOES_NOT_EXIST, ER(ER_SP_DOES_NOT_EXIST), "Event", et->name.str); ret= 0; } else my_error(ER_EVENT_DOES_NOT_EXIST, MYF(0), et->name.str); goto done; } done: /* evex_drop_event() is used by event_timed::drop therefore we have to close our thread tables. */ close_thread_tables(thd); thd->restore_backup_open_tables_state(&backup); DBUG_RETURN(ret); } /* Drops an event SYNOPSIS evex_drop_event() thd THD et event's name drop_if_exists if set and the event not existing => warning onto the stack rows_affected affected number of rows is returned heres */ int evex_drop_event(THD *thd, event_timed *et, bool drop_if_exists, uint *rows_affected) { TABLE *table; int ret= 0; DBUG_ENTER("evex_drop_event"); VOID(pthread_mutex_lock(&LOCK_evex_running)); if (evex_is_running) ret= evex_remove_from_cache(&et->dbname, &et->name, true, true); VOID(pthread_mutex_unlock(&LOCK_evex_running)); if (ret == 1) ret= 0; else if (ret == 0) ret= db_drop_event(thd, et, drop_if_exists, rows_affected); else my_error(ER_UNKNOWN_ERROR, MYF(0)); DBUG_RETURN(ret); } /* SHOW CREATE EVENT SYNOPSIS evex_show_create_event() thd THD spn the name of the event (db, name) definer the definer of the event RETURNS 0 - OK 1 - Error during writing to the wire */ int evex_show_create_event(THD *thd, sp_name *spn, LEX_STRING definer) { int ret; event_timed *et= NULL; Open_tables_state backup; DBUG_ENTER("evex_update_event"); DBUG_PRINT("enter", ("name: %*s", spn->m_name.length, spn->m_name.str)); thd->reset_n_backup_open_tables_state(&backup); ret= db_find_event(thd, spn, &definer, &et, NULL, thd->mem_root); thd->restore_backup_open_tables_state(&backup); if (!ret && et) { Protocol *protocol= thd->protocol; char show_str_buf[768]; String show_str(show_str_buf, sizeof(show_str_buf), system_charset_info); List<Item> field_list; byte *sql_mode_str; ulong sql_mode_len=0; show_str.length(0); show_str.set_charset(system_charset_info); if (et->get_create_event(thd, &show_str)) DBUG_RETURN(1); field_list.push_back(new Item_empty_string("Event", NAME_LEN)); sql_mode_str= sys_var_thd_sql_mode::symbolic_mode_representation(thd, et->sql_mode, &sql_mode_len); field_list.push_back(new Item_empty_string("sql_mode", sql_mode_len)); field_list.push_back(new Item_empty_string("Create Event", show_str.length())); if (protocol->send_fields(&field_list, Protocol::SEND_NUM_ROWS | Protocol::SEND_EOF)) DBUG_RETURN(1); protocol->prepare_for_resend(); protocol->store(et->name.str, et->name.length, system_charset_info); protocol->store((char*) sql_mode_str, sql_mode_len, system_charset_info); protocol->store(show_str.c_ptr(), show_str.length(), system_charset_info); ret= protocol->write(); send_eof(thd); } DBUG_RETURN(ret); } /* evex_drop_db_events - Drops all events in the selected database thd - Thread db - ASCIIZ the name of the database Returns: 0 - OK 1 - Failed to delete a specific row 2 - Got NULL while reading db name from a row Note: The algo is the following 1. Go through the in-memory cache, if the scheduler is working and for every event whose dbname matches the database we drop check whether is currently in execution: - event_timed::can_spawn() returns true -> the event is not being executed in a child thread. The reason not to use event_timed::is_running() is that the latter shows only if it is being executed, which is 99% of the time in the thread but there are some initiliazations before and after the anonymous SP is being called. So if we delete in this moment -=> *boom*, so we have to check whether the thread has been spawned and can_spawn() is the right method. - event_timed::can_spawn() returns false -> being runned ATM just set the flags so it should drop itself. */ int evex_drop_db_events(THD *thd, char *db) { TABLE *table; READ_RECORD read_record_info; MYSQL_LOCK *lock; int ret= 0; uint i; LEX_STRING db_lex= {db, strlen(db)}; DBUG_ENTER("evex_drop_db_events"); DBUG_PRINT("info",("dropping events from %s", db)); VOID(pthread_mutex_lock(&LOCK_event_arrays)); if ((ret= evex_open_event_table(thd, TL_WRITE, &table))) { sql_print_error("Table mysql.event is damaged."); VOID(pthread_mutex_unlock(&LOCK_event_arrays)); DBUG_RETURN(SP_OPEN_TABLE_FAILED); } DBUG_PRINT("info",("%d elements in the queue", evex_queue_num_elements(EVEX_EQ_NAME))); VOID(pthread_mutex_lock(&LOCK_evex_running)); if (!evex_is_running) goto skip_memory; for (i= 0; i < evex_queue_num_elements(EVEX_EQ_NAME); ++i) { event_timed *et= evex_queue_element(&EVEX_EQ_NAME, i, event_timed*); if (sortcmp_lex_string(et->dbname, db_lex, system_charset_info)) continue; if (et->can_spawn_now_n_lock(thd)) { DBUG_PRINT("info",("event %s not running - direct delete", et->name.str)); if (!(ret= evex_db_find_event_aux(thd, et, table))) { DBUG_PRINT("info",("event %s found on disk", et->name.str)); if ((ret= table->file->ha_delete_row(table->record[0]))) { sql_print_error("Error while deleting a row - dropping " "a database. Skipping the rest."); my_error(ER_EVENT_DROP_FAILED, MYF(0), et->name.str); goto end; } DBUG_PRINT("info",("deleted event [%s] num [%d]. Time to free mem", et->name.str, i)); } else if (ret == EVEX_KEY_NOT_FOUND) { sql_print_error("Expected to find event %s.%s of %s on disk-not there.", et->dbname.str, et->name.str, et->definer.str); } et->free_sp(); delete et; et= 0; /* no need to call et->spawn_unlock because we already cleaned et */ } else { DBUG_PRINT("info",("event %s is running. setting exec_no_more and dropped", et->name.str)); et->flags|= EVENT_EXEC_NO_MORE; et->dropped= TRUE; } DBUG_PRINT("info",("%d elements in the queue", evex_queue_num_elements(EVEX_EQ_NAME))); evex_queue_delete_element(&EVEX_EQ_NAME, i);// 0 is top DBUG_PRINT("info",("%d elements in the queue", evex_queue_num_elements(EVEX_EQ_NAME))); /* decrease so we start at the same position, there will be less elements in the queue, it will still be ordered so on next iteration it will be again i the current element or if no more we finish. */ --i; } skip_memory: /* The reasoning behind having two loops is the following: If there was only one loop, the table-scan, then for every element which matches, the queue in memory has to be searched to remove the element. While if we go first over the queue and remove what's in there we have only one pass over it and after finishing it, moving to table-scan for the disabled events. This needs quite less time and means quite less locking on LOCK_event_arrays. */ DBUG_PRINT("info",("Mem-cache checked, now going to db for disabled events")); /* only enabled events are in memory, so we go now and delete the rest */ init_read_record(&read_record_info, thd, table ,NULL,1,0); while (!(read_record_info.read_record(&read_record_info)) && !ret) { char *et_db; if ((et_db= get_field(thd->mem_root, table->field[EVEX_FIELD_DB])) == NULL) { ret= 2; break; } LEX_STRING et_db_lex= {et_db, strlen(et_db)}; if (!sortcmp_lex_string(et_db_lex, db_lex, system_charset_info)) { event_timed ett; char *ptr; if ((ptr= get_field(thd->mem_root, table->field[EVEX_FIELD_STATUS])) == NullS) { sql_print_error("Error while loading from mysql.event. " "Table probably corrupted"); goto end; } /* When not running nothing is in memory so we have to clean everything. We don't delete EVENT_ENABLED events when the scheduler is running because maybe this is an event which we asked to drop itself when it is finished and it hasn't finished yet, so we don't touch it. It will drop itself. The not running ENABLED events has been already deleted from ha_delete_row() above in the loop over the QUEUE (in case the executor is running). 'D' stands for DISABLED, 'E' for ENABLED - it's an enum */ if ((evex_is_running && ptr[0] == 'D') || !evex_is_running) { DBUG_PRINT("info", ("Dropping %s.%s", et_db, ett.name.str)); if ((ret= table->file->ha_delete_row(table->record[0]))) { my_error(ER_EVENT_DROP_FAILED, MYF(0), ett.name.str); goto end; } } } } DBUG_PRINT("info",("Disk checked for disabled events. Finishing.")); end: VOID(pthread_mutex_unlock(&LOCK_evex_running)); VOID(pthread_mutex_unlock(&LOCK_event_arrays)); end_read_record(&read_record_info); thd->version--; /* Force close to free memory */ close_thread_tables(thd); DBUG_RETURN(ret); }