/* Copyright (c) 2006, 2017, Oracle and/or its affiliates. Copyright (c) 2010, 2017, MariaDB Corporation This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; version 2 of the License. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */ #include // For HAVE_REPLICATION #include "sql_priv.h" #include #include "rpl_mi.h" #include "slave.h" // SLAVE_MAX_HEARTBEAT_PERIOD #include "strfunc.h" #include "sql_repl.h" #ifdef HAVE_REPLICATION #define DEFAULT_CONNECT_RETRY 60 static void init_master_log_pos(Master_info* mi); Master_info::Master_info(LEX_STRING *connection_name_arg, bool is_slave_recovery) :Slave_reporting_capability("I/O"), ssl(0), ssl_verify_server_cert(1), fd(-1), io_thd(0), rli(is_slave_recovery), port(MYSQL_PORT), checksum_alg_before_fd(BINLOG_CHECKSUM_ALG_UNDEF), connect_retry(DEFAULT_CONNECT_RETRY), inited(0), abort_slave(0), slave_running(MYSQL_SLAVE_NOT_RUN), slave_run_id(0), clock_diff_with_master(0), sync_counter(0), heartbeat_period(0), received_heartbeats(0), master_id(0), prev_master_id(0), using_gtid(USE_GTID_NO), events_queued_since_last_gtid(0), gtid_reconnect_event_skip_count(0), gtid_event_seen(false), in_start_all_slaves(0), in_stop_all_slaves(0), users(0), killed(0) { host[0] = 0; user[0] = 0; password[0] = 0; ssl_ca[0]= 0; ssl_capath[0]= 0; ssl_cert[0]= 0; ssl_cipher[0]= 0; ssl_key[0]= 0; ssl_crl[0]= 0; ssl_crlpath[0]= 0; /* Store connection name and lower case connection name It's safe to ignore any OMM errors as this is checked by error() */ connection_name.length= cmp_connection_name.length= connection_name_arg->length; if ((connection_name.str= (char*) my_malloc(connection_name_arg->length*2+2, MYF(MY_WME)))) { cmp_connection_name.str= (connection_name.str + connection_name_arg->length+1); strmake(connection_name.str, connection_name_arg->str, connection_name.length); memcpy(cmp_connection_name.str, connection_name_arg->str, connection_name.length+1); my_casedn_str(system_charset_info, cmp_connection_name.str); } /* When MySQL restarted, all Rpl_filter settings which aren't in the my.cnf * will lose. So if you want a setting will not lose after restarting, you * should add them into my.cnf * */ rpl_filter= get_or_create_rpl_filter(connection_name.str, connection_name.length); copy_filter_setting(rpl_filter, global_rpl_filter); my_init_dynamic_array(&ignore_server_ids, sizeof(global_system_variables.server_id), 16, 16, MYF(0)); bzero((char*) &file, sizeof(file)); mysql_mutex_init(key_master_info_run_lock, &run_lock, MY_MUTEX_INIT_FAST); mysql_mutex_init(key_master_info_data_lock, &data_lock, MY_MUTEX_INIT_FAST); mysql_mutex_init(key_master_info_start_stop_lock, &start_stop_lock, MY_MUTEX_INIT_SLOW); mysql_mutex_setflags(&run_lock, MYF_NO_DEADLOCK_DETECTION); mysql_mutex_setflags(&data_lock, MYF_NO_DEADLOCK_DETECTION); mysql_mutex_init(key_master_info_sleep_lock, &sleep_lock, MY_MUTEX_INIT_FAST); mysql_cond_init(key_master_info_data_cond, &data_cond, NULL); mysql_cond_init(key_master_info_start_cond, &start_cond, NULL); mysql_cond_init(key_master_info_stop_cond, &stop_cond, NULL); mysql_cond_init(key_master_info_sleep_cond, &sleep_cond, NULL); } /** Wait until no one is using Master_info */ void Master_info::wait_until_free() { mysql_mutex_lock(&sleep_lock); killed= 1; while (users) mysql_cond_wait(&sleep_cond, &sleep_lock); mysql_mutex_unlock(&sleep_lock); } /** Delete master_info */ Master_info::~Master_info() { wait_until_free(); rpl_filters.delete_element(connection_name.str, connection_name.length, (void (*)(const char*, uchar*)) free_rpl_filter); my_free(connection_name.str); delete_dynamic(&ignore_server_ids); mysql_mutex_destroy(&run_lock); mysql_mutex_destroy(&data_lock); mysql_mutex_destroy(&sleep_lock); mysql_mutex_destroy(&start_stop_lock); mysql_cond_destroy(&data_cond); mysql_cond_destroy(&start_cond); mysql_cond_destroy(&stop_cond); mysql_cond_destroy(&sleep_cond); } /** A comparison function to be supplied as argument to @c sort_dynamic() and @c bsearch() @return -1 if first argument is less, 0 if it equal to, 1 if it is greater than the second */ int change_master_server_id_cmp(ulong *id1, ulong *id2) { return *id1 < *id2? -1 : (*id1 > *id2? 1 : 0); } /** Reports if the s_id server has been configured to ignore events it generates with CHANGE MASTER IGNORE_SERVER_IDS= ( list of server ids ) Method is called from the io thread event receiver filtering. @param s_id the master server identifier @retval TRUE if s_id is in the list of ignored master servers, @retval FALSE otherwise. */ bool Master_info::shall_ignore_server_id(ulong s_id) { if (likely(ignore_server_ids.elements == 1)) return (* (ulong*) dynamic_array_ptr(&ignore_server_ids, 0)) == s_id; else return bsearch((const ulong *) &s_id, ignore_server_ids.buffer, ignore_server_ids.elements, sizeof(ulong), (int (*) (const void*, const void*)) change_master_server_id_cmp) != NULL; } void Master_info::clear_in_memory_info(bool all) { init_master_log_pos(this); if (all) { port= MYSQL_PORT; host[0] = 0; user[0] = 0; password[0] = 0; } } const char * Master_info::using_gtid_astext(enum enum_using_gtid arg) { switch (arg) { case USE_GTID_NO: return "No"; case USE_GTID_SLAVE_POS: return "Slave_Pos"; default: DBUG_ASSERT(arg == USE_GTID_CURRENT_POS); return "Current_Pos"; } } void init_master_log_pos(Master_info* mi) { DBUG_ENTER("init_master_log_pos"); mi->master_log_name[0] = 0; mi->master_log_pos = BIN_LOG_HEADER_SIZE; // skip magic number mi->using_gtid= Master_info::USE_GTID_NO; mi->gtid_current_pos.reset(); mi->events_queued_since_last_gtid= 0; mi->gtid_reconnect_event_skip_count= 0; mi->gtid_event_seen= false; /* Intentionally init ssl_verify_server_cert to 0, no option available */ mi->ssl_verify_server_cert= 0; /* always request heartbeat unless master_heartbeat_period is set explicitly zero. Here is the default value for heartbeat period if CHANGE MASTER did not specify it. (no data loss in conversion as hb period has a max) */ mi->heartbeat_period= (float) MY_MIN(SLAVE_MAX_HEARTBEAT_PERIOD, (slave_net_timeout/2.0)); DBUG_ASSERT(mi->heartbeat_period > (float) 0.001 || mi->heartbeat_period == 0); DBUG_VOID_RETURN; } enum { LINES_IN_MASTER_INFO_WITH_SSL= 14, /* 5.1.16 added value of master_ssl_verify_server_cert */ LINE_FOR_MASTER_SSL_VERIFY_SERVER_CERT= 15, /* 5.5 added value of master_heartbeat_period */ LINE_FOR_MASTER_HEARTBEAT_PERIOD= 16, /* MySQL Cluster 6.3 added master_bind */ LINE_FOR_MASTER_BIND = 17, /* 6.0 added value of master_ignore_server_id */ LINE_FOR_REPLICATE_IGNORE_SERVER_IDS= 18, /* 6.0 added value of master_uuid */ LINE_FOR_MASTER_UUID= 19, /* line for master_retry_count */ LINE_FOR_MASTER_RETRY_COUNT= 20, /* line for ssl_crl */ LINE_FOR_SSL_CRL= 21, /* line for ssl_crl */ LINE_FOR_SSL_CRLPATH= 22, /* MySQL 5.6 fixed-position lines. */ LINE_FOR_FIRST_MYSQL_5_6=23, LINE_FOR_LAST_MYSQL_5_6=23, /* Reserved lines for MySQL future versions. */ LINE_FOR_LAST_MYSQL_FUTURE=33, /* Number of (fixed-position) lines used when saving master info file */ LINES_IN_MASTER_INFO= LINE_FOR_LAST_MYSQL_FUTURE }; int init_master_info(Master_info* mi, const char* master_info_fname, const char* slave_info_fname, bool abort_if_no_master_info_file, int thread_mask) { int fd,error; char fname[FN_REFLEN+128]; DBUG_ENTER("init_master_info"); if (mi->inited) { /* We have to reset read position of relay-log-bin as we may have already been reading from 'hotlog' when the slave was stopped last time. If this case pos_in_file would be set and we would get a crash when trying to read the signature for the binary relay log. We only rewind the read position if we are starting the SQL thread. The handle_slave_sql thread assumes that the read position is at the beginning of the file, and will read the "signature" and then fast-forward to the last position read. */ if (thread_mask & SLAVE_SQL) { bool hot_log= FALSE; /* my_b_seek does an implicit flush_io_cache, so we need to: 1. check if this log is active (hot) 2. if it is we keep log_lock until the seek ends, otherwise release it right away. If we did not take log_lock, SQL thread might race with IO thread for the IO_CACHE mutex. */ mysql_mutex_t *log_lock= mi->rli.relay_log.get_log_lock(); mysql_mutex_lock(log_lock); hot_log= mi->rli.relay_log.is_active(mi->rli.linfo.log_file_name); if (!hot_log) mysql_mutex_unlock(log_lock); my_b_seek(mi->rli.cur_log, (my_off_t) 0); if (hot_log) mysql_mutex_unlock(log_lock); } DBUG_RETURN(0); } mi->mysql=0; mi->file_id=1; fn_format(fname, master_info_fname, mysql_data_home, "", 4+32); /* We need a mutex while we are changing master info parameters to keep other threads from reading bogus info */ mysql_mutex_lock(&mi->data_lock); fd = mi->fd; /* does master.info exist ? */ if (access(fname,F_OK)) { if (abort_if_no_master_info_file) { mysql_mutex_unlock(&mi->data_lock); DBUG_RETURN(0); } /* if someone removed the file from underneath our feet, just close the old descriptor and re-create the old file */ if (fd >= 0) mysql_file_close(fd, MYF(MY_WME)); if ((fd= mysql_file_open(key_file_master_info, fname, O_CREAT|O_RDWR|O_BINARY, MYF(MY_WME))) < 0 ) { sql_print_error("Failed to create a new master info file (\ file '%s', errno %d)", fname, my_errno); goto err; } if (init_io_cache(&mi->file, fd, IO_SIZE*2, READ_CACHE, 0L,0, MYF(MY_WME))) { sql_print_error("Failed to create a cache on master info file (\ file '%s')", fname); goto err; } mi->fd = fd; mi->clear_in_memory_info(false); } else // file exists { if (fd >= 0) reinit_io_cache(&mi->file, READ_CACHE, 0L,0,0); else { if ((fd= mysql_file_open(key_file_master_info, fname, O_RDWR|O_BINARY, MYF(MY_WME))) < 0 ) { sql_print_error("Failed to open the existing master info file (\ file '%s', errno %d)", fname, my_errno); goto err; } if (init_io_cache(&mi->file, fd, IO_SIZE*2, READ_CACHE, 0L, 0, MYF(MY_WME))) { sql_print_error("Failed to create a cache on master info file (\ file '%s')", fname); goto err; } } mi->fd = fd; int port, connect_retry, master_log_pos, lines; int ssl= 0, ssl_verify_server_cert= 0; float master_heartbeat_period= 0.0; char *first_non_digit; char buf[HOSTNAME_LENGTH+1]; /* Starting from 4.1.x master.info has new format. Now its first line contains number of lines in file. By reading this number we will be always distinguish to which version our master.info corresponds to. We can't simply count lines in file since versions before 4.1.x could generate files with more lines than needed. If first line doesn't contain a number or contain number less than LINES_IN_MASTER_INFO_WITH_SSL then such file is treated like file from pre 4.1.1 version. There is no ambiguity when reading an old master.info, as before 4.1.1, the first line contained the binlog's name, which is either empty or has an extension (contains a '.'), so can't be confused with an integer. So we're just reading first line and trying to figure which version is this. */ /* The first row is temporarily stored in mi->master_log_name, if it is line count and not binlog name (new format) it will be overwritten by the second row later. */ if (init_strvar_from_file(mi->master_log_name, sizeof(mi->master_log_name), &mi->file, "")) goto errwithmsg; lines= strtoul(mi->master_log_name, &first_non_digit, 10); if (mi->master_log_name[0]!='\0' && *first_non_digit=='\0' && lines >= LINES_IN_MASTER_INFO_WITH_SSL) { /* Seems to be new format => read master log name from next line */ if (init_strvar_from_file(mi->master_log_name, sizeof(mi->master_log_name), &mi->file, "")) goto errwithmsg; } else lines= 7; if (init_intvar_from_file(&master_log_pos, &mi->file, 4) || init_strvar_from_file(mi->host, sizeof(mi->host), &mi->file, 0) || init_strvar_from_file(mi->user, sizeof(mi->user), &mi->file, "test") || init_strvar_from_file(mi->password, SCRAMBLED_PASSWORD_CHAR_LENGTH+1, &mi->file, 0) || init_intvar_from_file(&port, &mi->file, MYSQL_PORT) || init_intvar_from_file(&connect_retry, &mi->file, DEFAULT_CONNECT_RETRY)) goto errwithmsg; /* If file has ssl part use it even if we have server without SSL support. But these options will be ignored later when slave will try connect to master, so in this case warning is printed. */ if (lines >= LINES_IN_MASTER_INFO_WITH_SSL) { if (init_intvar_from_file(&ssl, &mi->file, 0) || init_strvar_from_file(mi->ssl_ca, sizeof(mi->ssl_ca), &mi->file, 0) || init_strvar_from_file(mi->ssl_capath, sizeof(mi->ssl_capath), &mi->file, 0) || init_strvar_from_file(mi->ssl_cert, sizeof(mi->ssl_cert), &mi->file, 0) || init_strvar_from_file(mi->ssl_cipher, sizeof(mi->ssl_cipher), &mi->file, 0) || init_strvar_from_file(mi->ssl_key, sizeof(mi->ssl_key), &mi->file, 0)) goto errwithmsg; /* Starting from 5.1.16 ssl_verify_server_cert might be in the file */ if (lines >= LINE_FOR_MASTER_SSL_VERIFY_SERVER_CERT && init_intvar_from_file(&ssl_verify_server_cert, &mi->file, 0)) goto errwithmsg; /* Starting from 6.0 master_heartbeat_period might be in the file */ if (lines >= LINE_FOR_MASTER_HEARTBEAT_PERIOD && init_floatvar_from_file(&master_heartbeat_period, &mi->file, 0.0)) goto errwithmsg; /* Starting from MySQL Cluster 6.3 master_bind might be in the file (this is just a reservation to avoid future upgrade problems) */ if (lines >= LINE_FOR_MASTER_BIND && init_strvar_from_file(buf, sizeof(buf), &mi->file, "")) goto errwithmsg; /* Starting from 6.0 list of server_id of ignorable servers might be in the file */ if (lines >= LINE_FOR_REPLICATE_IGNORE_SERVER_IDS && init_dynarray_intvar_from_file(&mi->ignore_server_ids, &mi->file)) { sql_print_error("Failed to initialize master info ignore_server_ids"); goto errwithmsg; } /* reserved */ if (lines >= LINE_FOR_MASTER_UUID && init_strvar_from_file(buf, sizeof(buf), &mi->file, "")) goto errwithmsg; /* Starting from 5.5 the master_retry_count may be in the repository. */ if (lines >= LINE_FOR_MASTER_RETRY_COUNT && init_strvar_from_file(buf, sizeof(buf), &mi->file, "")) goto errwithmsg; if (lines >= LINE_FOR_SSL_CRLPATH && (init_strvar_from_file(mi->ssl_crl, sizeof(mi->ssl_crl), &mi->file, "") || init_strvar_from_file(mi->ssl_crlpath, sizeof(mi->ssl_crlpath), &mi->file, ""))) goto errwithmsg; /* Starting with MariaDB 10.0, we use a key=value syntax, which is nicer in several ways. But we leave a bunch of empty lines to accomodate any future old-style additions in MySQL (this will make it easier for users moving from MariaDB to MySQL, to not have MySQL try to interpret a MariaDB key=value line.) */ if (lines >= LINE_FOR_LAST_MYSQL_FUTURE) { uint i; /* Skip lines used by / reserved for MySQL >= 5.6. */ for (i= LINE_FOR_FIRST_MYSQL_5_6; i <= LINE_FOR_LAST_MYSQL_FUTURE; ++i) { if (init_strvar_from_file(buf, sizeof(buf), &mi->file, "")) goto errwithmsg; } /* Parse any extra key=value lines. Ignore unknown lines, to facilitate downgrades. */ while (!init_strvar_from_file(buf, sizeof(buf), &mi->file, 0)) { if (0 == strncmp(buf, STRING_WITH_LEN("using_gtid="))) { int val= atoi(buf + sizeof("using_gtid")); if (val == Master_info::USE_GTID_CURRENT_POS) mi->using_gtid= Master_info::USE_GTID_CURRENT_POS; else if (val == Master_info::USE_GTID_SLAVE_POS) mi->using_gtid= Master_info::USE_GTID_SLAVE_POS; else mi->using_gtid= Master_info::USE_GTID_NO; } } } } #ifndef HAVE_OPENSSL if (ssl) sql_print_warning("SSL information in the master info file " "('%s') are ignored because this MySQL slave was " "compiled without SSL support.", fname); #endif /* HAVE_OPENSSL */ /* This has to be handled here as init_intvar_from_file can't handle my_off_t types */ mi->master_log_pos= (my_off_t) master_log_pos; mi->port= (uint) port; mi->connect_retry= (uint) connect_retry; mi->ssl= (my_bool) ssl; mi->ssl_verify_server_cert= ssl_verify_server_cert; mi->heartbeat_period= MY_MIN(SLAVE_MAX_HEARTBEAT_PERIOD, master_heartbeat_period); } DBUG_PRINT("master_info",("log_file_name: %s position: %ld", mi->master_log_name, (ulong) mi->master_log_pos)); mi->rli.mi= mi; if (init_relay_log_info(&mi->rli, slave_info_fname)) goto err; mi->inited = 1; mi->rli.is_relay_log_recovery= FALSE; // now change cache READ -> WRITE - must do this before flush_master_info reinit_io_cache(&mi->file, WRITE_CACHE, 0L, 0, 1); if ((error= MY_TEST(flush_master_info(mi, TRUE, TRUE)))) sql_print_error("Failed to flush master info file"); mysql_mutex_unlock(&mi->data_lock); DBUG_RETURN(error); errwithmsg: sql_print_error("Error reading master configuration"); err: if (fd >= 0) { mysql_file_close(fd, MYF(0)); end_io_cache(&mi->file); } mi->fd= -1; mysql_mutex_unlock(&mi->data_lock); DBUG_RETURN(1); } /* RETURN 2 - flush relay log failed 1 - flush master info failed 0 - all ok */ int flush_master_info(Master_info* mi, bool flush_relay_log_cache, bool need_lock_relay_log) { IO_CACHE* file = &mi->file; char lbuf[22]; int err= 0; DBUG_ENTER("flush_master_info"); DBUG_PRINT("enter",("master_pos: %ld", (long) mi->master_log_pos)); /* Flush the relay log to disk. If we don't do it, then the relay log while have some part (its last kilobytes) in memory only, so if the slave server dies now, with, say, from master's position 100 to 150 in memory only (not on disk), and with position 150 in master.info, then when the slave restarts, the I/O thread will fetch binlogs from 150, so in the relay log we will have "[0, 100] U [150, infinity[" and nobody will notice it, so the SQL thread will jump from 100 to 150, and replication will silently break. When we come to this place in code, relay log may or not be initialized; the caller is responsible for setting 'flush_relay_log_cache' accordingly. */ if (flush_relay_log_cache) { mysql_mutex_t *log_lock= mi->rli.relay_log.get_log_lock(); IO_CACHE *log_file= mi->rli.relay_log.get_log_file(); if (need_lock_relay_log) mysql_mutex_lock(log_lock); mysql_mutex_assert_owner(log_lock); err= flush_io_cache(log_file); if (need_lock_relay_log) mysql_mutex_unlock(log_lock); if (err) DBUG_RETURN(2); } /* produce a line listing the total number and all the ignored server_id:s */ char* ignore_server_ids_buf; { ignore_server_ids_buf= (char *) my_malloc((sizeof(global_system_variables.server_id) * 3 + 1) * (1 + mi->ignore_server_ids.elements), MYF(MY_WME)); if (!ignore_server_ids_buf) DBUG_RETURN(1); ulong cur_len= sprintf(ignore_server_ids_buf, "%u", mi->ignore_server_ids.elements); for (ulong i= 0; i < mi->ignore_server_ids.elements; i++) { ulong s_id; get_dynamic(&mi->ignore_server_ids, (uchar*) &s_id, i); cur_len+= sprintf(ignore_server_ids_buf + cur_len, " %lu", s_id); } } /* We flushed the relay log BEFORE the master.info file, because if we crash now, we will get a duplicate event in the relay log at restart. If we flushed in the other order, we would get a hole in the relay log. And duplicate is better than hole (with a duplicate, in later versions we can add detection and scrap one event; with a hole there's nothing we can do). */ /* In certain cases this code may create master.info files that seems corrupted, because of extra lines filled with garbage in the end file (this happens if new contents take less space than previous contents of file). But because of number of lines in the first line of file we don't care about this garbage. */ char heartbeat_buf[FLOATING_POINT_BUFFER]; my_fcvt(mi->heartbeat_period, 3, heartbeat_buf, NULL); my_b_seek(file, 0L); my_b_printf(file, "%u\n%s\n%s\n%s\n%s\n%s\n%d\n%d\n%d\n%s\n%s\n%s\n%s\n%s\n%d\n%s\n%s\n%s\n%s\n%d\n%s\n%s\n" "\n\n\n\n\n\n\n\n\n\n\n" "using_gtid=%d\n", LINES_IN_MASTER_INFO, mi->master_log_name, llstr(mi->master_log_pos, lbuf), mi->host, mi->user, mi->password, mi->port, mi->connect_retry, (int)(mi->ssl), mi->ssl_ca, mi->ssl_capath, mi->ssl_cert, mi->ssl_cipher, mi->ssl_key, mi->ssl_verify_server_cert, heartbeat_buf, "", ignore_server_ids_buf, "", 0, mi->ssl_crl, mi->ssl_crlpath, mi->using_gtid); my_free(ignore_server_ids_buf); err= flush_io_cache(file); if (sync_masterinfo_period && !err && ++(mi->sync_counter) >= sync_masterinfo_period) { err= my_sync(mi->fd, MYF(MY_WME)); mi->sync_counter= 0; } DBUG_RETURN(-err); } void end_master_info(Master_info* mi) { DBUG_ENTER("end_master_info"); if (!mi->inited) DBUG_VOID_RETURN; if (mi->fd >= 0) { end_io_cache(&mi->file); mysql_file_close(mi->fd, MYF(MY_WME)); mi->fd = -1; } mi->inited = 0; DBUG_VOID_RETURN; } /* Multi-Master By P.Linux */ uchar *get_key_master_info(Master_info *mi, size_t *length, my_bool not_used __attribute__((unused))) { /* Return lower case name */ *length= mi->cmp_connection_name.length; return (uchar*) mi->cmp_connection_name.str; } /* Delete a master info Called from my_hash_delete(&master_info_hash) Stops associated slave threads and frees master_info */ void free_key_master_info(Master_info *mi) { DBUG_ENTER("free_key_master_info"); mysql_mutex_unlock(&LOCK_active_mi); /* Ensure that we are not in reset_slave while this is done */ mi->lock_slave_threads(); terminate_slave_threads(mi,SLAVE_FORCE_ALL); /* We use 2 here instead of 1 just to make it easier when debugging */ mi->killed= 2; end_master_info(mi); end_relay_log_info(&mi->rli); mi->unlock_slave_threads(); delete mi; mysql_mutex_lock(&LOCK_active_mi); DBUG_VOID_RETURN; } /** Check if connection name for master_info is valid. It's valid if it's a valid system name of length less than MAX_CONNECTION_NAME. @return 0 ok 1 error */ bool check_master_connection_name(LEX_STRING *name) { if (name->length >= MAX_CONNECTION_NAME) return 1; return 0; } /** Create a log file with a given suffix. @param res_file_name Store result here length Length of res_file_name buffer info_file Original file name (prefix) append 1 if we should add suffix last (not before ext) suffix Suffix @note The suffix is added before the extension of the file name prefixed with '-'. The suffix is also converted to lower case and we transform all not safe character, as we do with MySQL table names. If suffix is an empty string, then we don't add any suffix. This is to allow one to use this function also to generate old file names without a prefix. */ void create_logfile_name_with_suffix(char *res_file_name, size_t length, const char *info_file, bool append, LEX_STRING *suffix) { char buff[MAX_CONNECTION_NAME+1], res[MAX_CONNECTION_NAME * MAX_FILENAME_MBWIDTH+1], *p; p= strmake(res_file_name, info_file, length); /* If not empty suffix and there is place left for some part of the suffix */ if (suffix->length != 0 && p <= res_file_name + length -1) { const char *info_file_end= info_file + (p - res_file_name); const char *ext= append ? info_file_end : fn_ext2(info_file); size_t res_length, ext_pos, from_length; uint errors; /* Create null terminated string */ from_length= strmake(buff, suffix->str, suffix->length) - buff; /* Convert to characters usable in a file name */ res_length= strconvert(system_charset_info, buff, from_length, &my_charset_filename, res, sizeof(res), &errors); ext_pos= (size_t) (ext - info_file); length-= (suffix->length - ext_pos); /* Leave place for extension */ p= res_file_name + ext_pos; *p++= '-'; /* Add separator */ p= strmake(p, res, MY_MIN((size_t) (length - (p - res_file_name)), res_length)); /* Add back extension. We have checked above that there is space for it */ strmov(p, ext); } } void copy_filter_setting(Rpl_filter* dst_filter, Rpl_filter* src_filter) { char buf[256]; String tmp(buf, sizeof(buf), &my_charset_bin); dst_filter->get_do_db(&tmp); if (tmp.is_empty()) { src_filter->get_do_db(&tmp); if (!tmp.is_empty()) dst_filter->set_do_db(tmp.ptr()); } dst_filter->get_do_table(&tmp); if (tmp.is_empty()) { src_filter->get_do_table(&tmp); if (!tmp.is_empty()) dst_filter->set_do_table(tmp.ptr()); } dst_filter->get_ignore_db(&tmp); if (tmp.is_empty()) { src_filter->get_ignore_db(&tmp); if (!tmp.is_empty()) dst_filter->set_ignore_db(tmp.ptr()); } dst_filter->get_ignore_table(&tmp); if (tmp.is_empty()) { src_filter->get_ignore_table(&tmp); if (!tmp.is_empty()) dst_filter->set_ignore_table(tmp.ptr()); } dst_filter->get_wild_do_table(&tmp); if (tmp.is_empty()) { src_filter->get_wild_do_table(&tmp); if (!tmp.is_empty()) dst_filter->set_wild_do_table(tmp.ptr()); } dst_filter->get_wild_ignore_table(&tmp); if (tmp.is_empty()) { src_filter->get_wild_ignore_table(&tmp); if (!tmp.is_empty()) dst_filter->set_wild_ignore_table(tmp.ptr()); } if (dst_filter->rewrite_db_is_empty()) { if (!src_filter->rewrite_db_is_empty()) dst_filter->copy_rewrite_db(src_filter); } } Master_info_index::Master_info_index() { size_t filename_length, dir_length; /* Create the Master_info index file by prepending 'multi-' before the master_info_file file name. */ fn_format(index_file_name, master_info_file, mysql_data_home, "", MY_UNPACK_FILENAME); filename_length= strlen(index_file_name) + 1; /* Count 0 byte */ dir_length= dirname_length(index_file_name); bmove_upp((uchar*) index_file_name + filename_length + 6, (uchar*) index_file_name + filename_length, filename_length - dir_length); memcpy(index_file_name + dir_length, "multi-", 6); bzero((char*) &index_file, sizeof(index_file)); index_file.file= -1; } /** Free all connection threads This is done during early stages of shutdown to give connection threads and slave threads time to die before ~Master_info_index is called */ void Master_info_index::free_connections() { mysql_mutex_assert_owner(&LOCK_active_mi); my_hash_reset(&master_info_hash); } /** Free all connection threads and free structures */ Master_info_index::~Master_info_index() { my_hash_free(&master_info_hash); end_io_cache(&index_file); if (index_file.file >= 0) my_close(index_file.file, MYF(MY_WME)); } /* Load All Master_info from master.info.index File * RETURN: * 0 - All Success * 1 - All Fail * 2 - Some Success, Some Fail */ bool Master_info_index::init_all_master_info() { int thread_mask; int err_num= 0, succ_num= 0; // The number of success read Master_info char sign[MAX_CONNECTION_NAME+1]; File index_file_nr; THD *thd; DBUG_ENTER("init_all_master_info"); DBUG_ASSERT(master_info_index); if ((index_file_nr= my_open(index_file_name, O_RDWR | O_CREAT | O_BINARY , MYF(MY_WME | ME_NOREFRESH))) < 0 || my_sync(index_file_nr, MYF(MY_WME)) || init_io_cache(&index_file, index_file_nr, IO_SIZE, READ_CACHE, my_seek(index_file_nr,0L,MY_SEEK_END,MYF(0)), 0, MYF(MY_WME | MY_WAIT_IF_FULL))) { if (index_file_nr >= 0) my_close(index_file_nr,MYF(0)); sql_print_error("Creation of Master_info index file '%s' failed", index_file_name); DBUG_RETURN(1); } /* Initialize Master_info Hash Table */ if (my_hash_init(&master_info_hash, system_charset_info, MAX_REPLICATION_THREAD, 0, 0, (my_hash_get_key) get_key_master_info, (my_hash_free_key)free_key_master_info, HASH_UNIQUE)) { sql_print_error("Initializing Master_info hash table failed"); DBUG_RETURN(1); } thd= new THD; /* Needed by start_slave_threads */ thd->thread_stack= (char*) &thd; thd->store_globals(); reinit_io_cache(&index_file, READ_CACHE, 0L,0,0); while (!init_strvar_from_file(sign, sizeof(sign), &index_file, NULL)) { LEX_STRING connection_name; Master_info *mi; char buf_master_info_file[FN_REFLEN]; char buf_relay_log_info_file[FN_REFLEN]; connection_name.str= sign; connection_name.length= strlen(sign); if (!(mi= new Master_info(&connection_name, relay_log_recovery)) || mi->error()) { delete mi; goto error; } init_thread_mask(&thread_mask,mi,0 /*not inverse*/); create_logfile_name_with_suffix(buf_master_info_file, sizeof(buf_master_info_file), master_info_file, 0, &mi->cmp_connection_name); create_logfile_name_with_suffix(buf_relay_log_info_file, sizeof(buf_relay_log_info_file), relay_log_info_file, 0, &mi->cmp_connection_name); if (global_system_variables.log_warnings > 1) sql_print_information("Reading Master_info: '%s' Relay_info:'%s'", buf_master_info_file, buf_relay_log_info_file); mi->lock_slave_threads(); if (init_master_info(mi, buf_master_info_file, buf_relay_log_info_file, 0, thread_mask)) { err_num++; sql_print_error("Initialized Master_info from '%s' failed", buf_master_info_file); if (!master_info_index->get_master_info(&connection_name, Sql_condition::WARN_LEVEL_NOTE)) { /* Master_info is not in HASH; Add it */ if (master_info_index->add_master_info(mi, FALSE)) goto error; succ_num++; mi->unlock_slave_threads(); } else { /* Master_info already in HASH */ sql_print_error(ER(ER_CONNECTION_ALREADY_EXISTS), (int) connection_name.length, connection_name.str, (int) connection_name.length, connection_name.str); mi->unlock_slave_threads(); delete mi; } continue; } else { /* Initialization of Master_info succeded. Add it to HASH */ if (global_system_variables.log_warnings > 1) sql_print_information("Initialized Master_info from '%s'", buf_master_info_file); if (master_info_index->get_master_info(&connection_name, Sql_condition::WARN_LEVEL_NOTE)) { /* Master_info was already registered */ sql_print_error(ER(ER_CONNECTION_ALREADY_EXISTS), (int) connection_name.length, connection_name.str, (int) connection_name.length, connection_name.str); mi->unlock_slave_threads(); delete mi; continue; } /* Master_info was not registered; add it */ if (master_info_index->add_master_info(mi, FALSE)) goto error; succ_num++; if (!opt_skip_slave_start) { if (start_slave_threads(1 /* need mutex */, 1 /* wait for start*/, mi, buf_master_info_file, buf_relay_log_info_file, SLAVE_IO | SLAVE_SQL)) { sql_print_error("Failed to create slave threads for connection '%.*s'", (int) connection_name.length, connection_name.str); continue; } if (global_system_variables.log_warnings) sql_print_information("Started replication for '%.*s'", (int) connection_name.length, connection_name.str); } mi->unlock_slave_threads(); } } thd->reset_globals(); delete thd; if (!err_num) // No Error on read Master_info { if (global_system_variables.log_warnings > 1) sql_print_information("Reading of all Master_info entries succeded"); DBUG_RETURN(0); } if (succ_num) // Have some Error and some Success { sql_print_warning("Reading of some Master_info entries failed"); DBUG_RETURN(2); } sql_print_error("Reading of all Master_info entries failed!"); DBUG_RETURN(1); error: thd->reset_globals(); delete thd; DBUG_RETURN(1); } /* Write new master.info to master.info.index File */ bool Master_info_index::write_master_name_to_index_file(LEX_STRING *name, bool do_sync) { DBUG_ASSERT(my_b_inited(&index_file) != 0); DBUG_ENTER("write_master_name_to_index_file"); /* Don't write default slave to master_info.index */ if (name->length == 0) DBUG_RETURN(0); reinit_io_cache(&index_file, WRITE_CACHE, my_b_filelength(&index_file), 0, 0); if (my_b_write(&index_file, (uchar*) name->str, name->length) || my_b_write(&index_file, (uchar*) "\n", 1) || flush_io_cache(&index_file) || (do_sync && my_sync(index_file.file, MYF(MY_WME)))) { sql_print_error("Write of new Master_info for '%.*s' to index file failed", (int) name->length, name->str); DBUG_RETURN(1); } DBUG_RETURN(0); } /** Get Master_info for a connection and lock the object from deletion @param connection_name Connection name warning WARN_LEVEL_NOTE -> Don't print anything WARN_LEVEL_WARN -> Issue warning if not exists WARN_LEVEL_ERROR-> Issue error if not exists */ Master_info *get_master_info(LEX_STRING *connection_name, Sql_condition::enum_warning_level warning) { Master_info *mi; DBUG_ENTER("get_master_info"); /* Protect against inserts into hash */ mysql_mutex_lock(&LOCK_active_mi); /* The following can only be true during shutdown when slave has been killed but some other threads are still trying to access slave statistics. */ if (unlikely(!master_info_index)) { if (warning != Sql_condition::WARN_LEVEL_NOTE) my_error(WARN_NO_MASTER_INFO, MYF(warning == Sql_condition::WARN_LEVEL_WARN ? ME_JUST_WARNING : 0), (int) connection_name->length, connection_name->str); mysql_mutex_unlock(&LOCK_active_mi); DBUG_RETURN(0); } if ((mi= master_info_index->get_master_info(connection_name, warning))) { /* We have to use sleep_lock here. If we would use LOCK_active_mi then we would take locks in wrong order in Master_info::release() */ mysql_mutex_lock(&mi->sleep_lock); mi->users++; DBUG_PRINT("info",("users: %d", mi->users)); mysql_mutex_unlock(&mi->sleep_lock); } mysql_mutex_unlock(&LOCK_active_mi); DBUG_RETURN(mi); } /** Release master info. Signals ~Master_info that it's now safe to delete it */ void Master_info::release() { mysql_mutex_lock(&sleep_lock); if (!--users && killed) { /* Signal ~Master_info that it's ok to now free it */ mysql_cond_signal(&sleep_cond); } mysql_mutex_unlock(&sleep_lock); } /** Get Master_info for a connection @param connection_name Connection name warning WARN_LEVEL_NOTE -> Don't print anything WARN_LEVEL_WARN -> Issue warning if not exists WARN_LEVEL_ERROR-> Issue error if not exists */ Master_info * Master_info_index::get_master_info(LEX_STRING *connection_name, Sql_condition::enum_warning_level warning) { Master_info *mi; char buff[MAX_CONNECTION_NAME+1], *res; uint buff_length; DBUG_ENTER("get_master_info"); DBUG_PRINT("enter", ("connection_name: '%.*s'", (int) connection_name->length, connection_name->str)); /* Make name lower case for comparison */ res= strmake(buff, connection_name->str, connection_name->length); my_casedn_str(system_charset_info, buff); buff_length= (size_t) (res-buff); mi= (Master_info*) my_hash_search(&master_info_hash, (uchar*) buff, buff_length); if (!mi && warning != Sql_condition::WARN_LEVEL_NOTE) { my_error(WARN_NO_MASTER_INFO, MYF(warning == Sql_condition::WARN_LEVEL_WARN ? ME_JUST_WARNING : 0), (int) connection_name->length, connection_name->str); } DBUG_RETURN(mi); } /* Check Master_host & Master_port is duplicated or not */ bool Master_info_index::check_duplicate_master_info(LEX_STRING *name_arg, const char *host, uint port) { Master_info *mi; DBUG_ENTER("check_duplicate_master_info"); mysql_mutex_assert_owner(&LOCK_active_mi); DBUG_ASSERT(master_info_index); /* Get full host and port name */ if ((mi= master_info_index->get_master_info(name_arg, Sql_condition::WARN_LEVEL_NOTE))) { if (!host) host= mi->host; if (!port) port= mi->port; } if (!host || !port) DBUG_RETURN(FALSE); // Not comparable yet for (uint i= 0; i < master_info_hash.records; ++i) { Master_info *tmp_mi; tmp_mi= (Master_info *) my_hash_element(&master_info_hash, i); if (tmp_mi == mi) continue; // Current connection if (!strcasecmp(host, tmp_mi->host) && port == tmp_mi->port) { my_error(ER_CONNECTION_ALREADY_EXISTS, MYF(0), (int) name_arg->length, name_arg->str, (int) tmp_mi->connection_name.length, tmp_mi->connection_name.str); DBUG_RETURN(TRUE); } } DBUG_RETURN(FALSE); } /* Add a Master_info class to Hash Table */ bool Master_info_index::add_master_info(Master_info *mi, bool write_to_file) { /* We have to protect against shutdown to ensure we are not calling my_hash_insert() while my_hash_free() is in progress */ if (unlikely(shutdown_in_progress) || !my_hash_insert(&master_info_hash, (uchar*) mi)) { if (global_system_variables.log_warnings > 1) sql_print_information("Added new Master_info '%.*s' to hash table", (int) mi->connection_name.length, mi->connection_name.str); if (write_to_file) return write_master_name_to_index_file(&mi->connection_name, 1); return FALSE; } /* Impossible error (EOM) ? */ sql_print_error("Adding new entry '%.*s' to master_info failed", (int) mi->connection_name.length, mi->connection_name.str); return TRUE; } /** Remove a Master_info class From Hash Table TODO: Change this to use my_rename() to make the file name creation atomic */ bool Master_info_index::remove_master_info(Master_info *mi) { DBUG_ENTER("remove_master_info"); mysql_mutex_assert_owner(&LOCK_active_mi); // Delete Master_info and rewrite others to file if (!my_hash_delete(&master_info_hash, (uchar*) mi)) { File index_file_nr; // Close IO_CACHE and FILE handler fisrt end_io_cache(&index_file); my_close(index_file.file, MYF(MY_WME)); // Reopen File and truncate it if ((index_file_nr= my_open(index_file_name, O_RDWR | O_CREAT | O_TRUNC | O_BINARY , MYF(MY_WME))) < 0 || init_io_cache(&index_file, index_file_nr, IO_SIZE, WRITE_CACHE, my_seek(index_file_nr,0L,MY_SEEK_END,MYF(0)), 0, MYF(MY_WME | MY_WAIT_IF_FULL))) { int error= my_errno; if (index_file_nr >= 0) my_close(index_file_nr,MYF(0)); sql_print_error("Create of Master Info Index file '%s' failed with " "error: %M", index_file_name, error); DBUG_RETURN(TRUE); } // Rewrite Master_info.index for (uint i= 0; i< master_info_hash.records; ++i) { Master_info *tmp_mi; tmp_mi= (Master_info *) my_hash_element(&master_info_hash, i); write_master_name_to_index_file(&tmp_mi->connection_name, 0); } if (my_sync(index_file_nr, MYF(MY_WME))) DBUG_RETURN(TRUE); } DBUG_RETURN(FALSE); } /** give_error_if_slave_running() @param already_locked 0 if we need to lock, 1 if we have LOCK_active_mi_locked @return TRUE If some slave is running. An error is printed FALSE No slave is running */ bool give_error_if_slave_running(bool already_locked) { bool ret= 0; DBUG_ENTER("give_error_if_slave_running"); if (!already_locked) mysql_mutex_lock(&LOCK_active_mi); if (!master_info_index) { my_error(ER_SERVER_SHUTDOWN, MYF(0)); ret= 1; } else { HASH *hash= &master_info_index->master_info_hash; for (uint i= 0; i< hash->records; ++i) { Master_info *mi; mi= (Master_info *) my_hash_element(hash, i); if (mi->rli.slave_running != MYSQL_SLAVE_NOT_RUN) { my_error(ER_SLAVE_MUST_STOP, MYF(0), (int) mi->connection_name.length, mi->connection_name.str); ret= 1; break; } } } if (!already_locked) mysql_mutex_unlock(&LOCK_active_mi); DBUG_RETURN(ret); } /** any_slave_sql_running() @return 0 No Slave SQL thread is running # Number of slave SQL thread running Note that during shutdown we return 1. This is needed to ensure we don't try to resize thread pool during shutdown as during shutdown master_info_hash may be freeing the hash and during that time hash entries can't be accessed. */ uint any_slave_sql_running() { uint count= 0; HASH *hash; DBUG_ENTER("any_slave_sql_running"); mysql_mutex_lock(&LOCK_active_mi); if (unlikely(shutdown_in_progress || !master_info_index)) { mysql_mutex_unlock(&LOCK_active_mi); DBUG_RETURN(1); } hash= &master_info_index->master_info_hash; for (uint i= 0; i< hash->records; ++i) { Master_info *mi= (Master_info *)my_hash_element(hash, i); if (mi->rli.slave_running != MYSQL_SLAVE_NOT_RUN) count++; } mysql_mutex_unlock(&LOCK_active_mi); DBUG_RETURN(count); } /** Master_info_index::start_all_slaves() Start all slaves that was not running. @return TRUE Error FALSE Everything ok. This code is written so that we don't keep LOCK_active_mi active while we are starting a slave. */ bool Master_info_index::start_all_slaves(THD *thd) { bool result= FALSE; DBUG_ENTER("start_all_slaves"); mysql_mutex_assert_owner(&LOCK_active_mi); for (uint i= 0; i< master_info_hash.records; i++) { Master_info *mi; mi= (Master_info *) my_hash_element(&master_info_hash, i); mi->in_start_all_slaves= 0; } for (uint i= 0; i< master_info_hash.records; ) { int error; Master_info *mi; mi= (Master_info *) my_hash_element(&master_info_hash, i); /* Try to start all slaves that are configured (host is defined) and are not already running */ if (!((mi->slave_running == MYSQL_SLAVE_NOT_RUN || !mi->rli.slave_running) && *mi->host) || mi->in_start_all_slaves) { i++; continue; } mi->in_start_all_slaves= 1; mysql_mutex_lock(&mi->sleep_lock); mi->users++; // Mark used mysql_mutex_unlock(&mi->sleep_lock); mysql_mutex_unlock(&LOCK_active_mi); error= start_slave(thd, mi, 1); mi->release(); mysql_mutex_lock(&LOCK_active_mi); if (error) { my_error(ER_CANT_START_STOP_SLAVE, MYF(0), "START", (int) mi->connection_name.length, mi->connection_name.str); result= 1; if (error < 0) // fatal error break; } else push_warning_printf(thd, Sql_condition::WARN_LEVEL_NOTE, ER_SLAVE_STARTED, ER(ER_SLAVE_STARTED), (int) mi->connection_name.length, mi->connection_name.str); /* Restart from first element as master_info_hash may have changed */ i= 0; continue; } DBUG_RETURN(result); } /** Master_info_index::stop_all_slaves() Start all slaves that was not running. @return TRUE Error FALSE Everything ok. This code is written so that we don't keep LOCK_active_mi active while we are stopping a slave. */ bool Master_info_index::stop_all_slaves(THD *thd) { bool result= FALSE; DBUG_ENTER("stop_all_slaves"); mysql_mutex_assert_owner(&LOCK_active_mi); for (uint i= 0; i< master_info_hash.records; i++) { Master_info *mi; mi= (Master_info *) my_hash_element(&master_info_hash, i); mi->in_stop_all_slaves= 0; } for (uint i= 0; i< master_info_hash.records ;) { int error; Master_info *mi; mi= (Master_info *) my_hash_element(&master_info_hash, i); if (!(mi->slave_running != MYSQL_SLAVE_NOT_RUN || mi->rli.slave_running) || mi->in_stop_all_slaves) { i++; continue; } mi->in_stop_all_slaves= 1; // Protection for loops mysql_mutex_lock(&mi->sleep_lock); mi->users++; // Mark used mysql_mutex_unlock(&mi->sleep_lock); mysql_mutex_unlock(&LOCK_active_mi); error= stop_slave(thd, mi, 1); mi->release(); mysql_mutex_lock(&LOCK_active_mi); if (error) { my_error(ER_CANT_START_STOP_SLAVE, MYF(0), "STOP", (int) mi->connection_name.length, mi->connection_name.str); result= 1; if (error < 0) // Fatal error break; } else push_warning_printf(thd, Sql_condition::WARN_LEVEL_NOTE, ER_SLAVE_STOPPED, ER(ER_SLAVE_STOPPED), (int) mi->connection_name.length, mi->connection_name.str); /* Restart from first element as master_info_hash may have changed */ i= 0; continue; } DBUG_RETURN(result); } #endif /* HAVE_REPLICATION */