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| -rw-r--r-- | extra/mariabackup/backup_mysql.cc | 1947 |
1 files changed, 1947 insertions, 0 deletions
diff --git a/extra/mariabackup/backup_mysql.cc b/extra/mariabackup/backup_mysql.cc new file mode 100644 index 00000000..cf8a5051 --- /dev/null +++ b/extra/mariabackup/backup_mysql.cc @@ -0,0 +1,1947 @@ +/****************************************************** +hot backup tool for InnoDB +(c) 2009-2015 Percona LLC and/or its affiliates +Originally Created 3/3/2009 Yasufumi Kinoshita +Written by Alexey Kopytov, Aleksandr Kuzminsky, Stewart Smith, Vadim Tkachenko, +Yasufumi Kinoshita, Ignacio Nin and Baron Schwartz. + +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 Street, Fifth Floor, Boston, MA 02110-1335 USA + +******************************************************* + +This file incorporates work covered by the following copyright and +permission notice: + +Copyright (c) 2000, 2011, MySQL AB & Innobase Oy. All Rights Reserved. + +This program is free software; you can redistribute it and/or modify it under +the terms of the GNU General Public License 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 +Street, Fifth Floor, Boston, MA 02110-1335 USA + +*******************************************************/ +#define MYSQL_CLIENT + +#include <my_global.h> +#include <mysql.h> +#include <mysqld.h> +#include <my_sys.h> +#include <stdlib.h> +#include <string.h> +#include <limits> +#include "common.h" +#include "xtrabackup.h" +#include "srv0srv.h" +#include "mysql_version.h" +#include "backup_copy.h" +#include "backup_mysql.h" +#include "mysqld.h" +#include "xb_plugin.h" +#include <sstream> +#include <sql_error.h> +#include "page0zip.h" + +char *tool_name; +char tool_args[2048]; + +ulong mysql_server_version; + +/* server capabilities */ +bool have_changed_page_bitmaps = false; +bool have_backup_locks = false; +bool have_lock_wait_timeout = false; +bool have_galera_enabled = false; +bool have_multi_threaded_slave = false; +bool have_gtid_slave = false; + +/* Kill long selects */ +static mysql_mutex_t kill_query_thread_mutex; +static bool kill_query_thread_running, kill_query_thread_stopping; +static mysql_cond_t kill_query_thread_stopped; +static mysql_cond_t kill_query_thread_stop; + +bool sql_thread_started = false; +char *mysql_slave_position = NULL; +char *mysql_binlog_position = NULL; +char *buffer_pool_filename = NULL; + +/* History on server */ +time_t history_start_time; +time_t history_end_time; +time_t history_lock_time; + +MYSQL *mysql_connection; + +extern my_bool opt_ssl_verify_server_cert, opt_use_ssl; + +MYSQL * +xb_mysql_connect() +{ + MYSQL *connection = mysql_init(NULL); + char mysql_port_str[std::numeric_limits<int>::digits10 + 3]; + + sprintf(mysql_port_str, "%d", opt_port); + + if (connection == NULL) { + msg("Failed to init MariaDB struct: %s.", + mysql_error(connection)); + return(NULL); + } + +#if !defined(DONT_USE_MYSQL_PWD) + if (!opt_password) + { + opt_password=getenv("MYSQL_PWD"); + } +#endif + + if (!opt_secure_auth) { + mysql_options(connection, MYSQL_SECURE_AUTH, + (char *) &opt_secure_auth); + } + + if (xb_plugin_dir && *xb_plugin_dir){ + mysql_options(connection, MYSQL_PLUGIN_DIR, xb_plugin_dir); + } + mysql_options(connection, MYSQL_OPT_PROTOCOL, &opt_protocol); + mysql_options(connection,MYSQL_SET_CHARSET_NAME, "utf8"); + + msg("Connecting to MariaDB server host: %s, user: %s, password: %s, " + "port: %s, socket: %s", opt_host ? opt_host : "localhost", + opt_user ? opt_user : "not set", + opt_password ? "set" : "not set", + opt_port != 0 ? mysql_port_str : "not set", + opt_socket ? opt_socket : "not set"); + +#ifdef HAVE_OPENSSL + if (opt_use_ssl && opt_protocol <= MYSQL_PROTOCOL_SOCKET) + { + mysql_ssl_set(connection, opt_ssl_key, opt_ssl_cert, + opt_ssl_ca, opt_ssl_capath, + opt_ssl_cipher); + mysql_options(connection, MYSQL_OPT_SSL_CRL, opt_ssl_crl); + mysql_options(connection, MYSQL_OPT_SSL_CRLPATH, + opt_ssl_crlpath); + } + mysql_options(connection,MYSQL_OPT_SSL_VERIFY_SERVER_CERT, + (char*)&opt_ssl_verify_server_cert); +#endif + + if (!mysql_real_connect(connection, + opt_host ? opt_host : "localhost", + opt_user, + opt_password, + "" /*database*/, opt_port, + opt_socket, 0)) { + msg("Failed to connect to MariaDB server: %s.", mysql_error(connection)); + mysql_close(connection); + return(NULL); + } + + xb_mysql_query(connection, "SET SESSION wait_timeout=2147483, max_statement_time=0", + false, true); + + return(connection); +} + +/*********************************************************************//** +Execute mysql query. */ +MYSQL_RES * +xb_mysql_query(MYSQL *connection, const char *query, bool use_result, + bool die_on_error) +{ + MYSQL_RES *mysql_result = NULL; + + if (mysql_query(connection, query)) { + if (die_on_error) { + die("failed to execute query %s: %s", query, mysql_error(connection)); + } else { + msg("Error: failed to execute query %s: %s", query, mysql_error(connection)); + } + return(NULL); + } + + /* store result set on client if there is a result */ + if (mysql_field_count(connection) > 0) { + if ((mysql_result = mysql_store_result(connection)) == NULL) { + die("failed to fetch query result %s: %s", + query, mysql_error(connection)); + } + + if (!use_result) { + mysql_free_result(mysql_result); + mysql_result = NULL; + } + } + + return mysql_result; +} + + +struct mysql_variable { + const char *name; + char **value; +}; + + +static +void +read_mysql_variables(MYSQL *connection, const char *query, mysql_variable *vars, + bool vertical_result) +{ + MYSQL_RES *mysql_result; + MYSQL_ROW row; + mysql_variable *var; + + mysql_result = xb_mysql_query(connection, query, true); + + ut_ad(!vertical_result || mysql_num_fields(mysql_result) == 2); + + if (vertical_result) { + while ((row = mysql_fetch_row(mysql_result))) { + char *name = row[0]; + char *value = row[1]; + for (var = vars; var->name; var++) { + if (strcmp(var->name, name) == 0 + && value != NULL) { + *(var->value) = strdup(value); + } + } + } + } else { + MYSQL_FIELD *field; + + if ((row = mysql_fetch_row(mysql_result)) != NULL) { + int i = 0; + while ((field = mysql_fetch_field(mysql_result)) + != NULL) { + char *name = field->name; + char *value = row[i]; + for (var = vars; var->name; var++) { + if (strcmp(var->name, name) == 0 + && value != NULL) { + *(var->value) = strdup(value); + } + } + ++i; + } + } + } + + mysql_free_result(mysql_result); +} + + +static +void +free_mysql_variables(mysql_variable *vars) +{ + mysql_variable *var; + + for (var = vars; var->name; var++) { + free(*(var->value)); + } +} + + +static +char * +read_mysql_one_value(MYSQL *connection, const char *query, + uint column, uint expect_columns) +{ + MYSQL_RES *mysql_result; + MYSQL_ROW row; + char *result = NULL; + + mysql_result = xb_mysql_query(connection, query, true); + + ut_ad(mysql_num_fields(mysql_result) == expect_columns); + + if ((row = mysql_fetch_row(mysql_result))) { + result = strdup(row[column]); + } + + mysql_free_result(mysql_result); + + return(result); +} + + +static +char * +read_mysql_one_value(MYSQL *mysql, const char *query) +{ + return read_mysql_one_value(mysql, query, 0/*offset*/, 1/*total columns*/); +} + + +static +bool +check_server_version(ulong version_number, const char *version_string) +{ + if (strstr(version_string, "MariaDB") && version_number >= 100800) + return true; + + msg("Error: Unsupported server version: '%s'.", version_string); + return false; +} + +/*********************************************************************//** +Receive options important for XtraBackup from server. +@return true on success. */ +bool get_mysql_vars(MYSQL *connection) +{ + char *gtid_mode_var= NULL; + char *version_var= NULL; + char *have_backup_locks_var= NULL; + char *log_bin_var= NULL; + char *lock_wait_timeout_var= NULL; + char *wsrep_on_var= NULL; + char *slave_parallel_workers_var= NULL; + char *gtid_slave_pos_var= NULL; + char *innodb_buffer_pool_filename_var= NULL; + char *datadir_var= NULL; + char *innodb_log_group_home_dir_var= NULL; + char *innodb_log_file_size_var= NULL; + char *innodb_log_files_in_group_var= NULL; + char *innodb_data_file_path_var= NULL; + char *innodb_data_home_dir_var= NULL; + char *innodb_undo_directory_var= NULL; + char *innodb_page_size_var= NULL; + char *innodb_undo_tablespaces_var= NULL; + char *aria_log_dir_path_var= NULL; + char *page_zip_level_var= NULL; + char *ignore_db_dirs= NULL; + char *endptr; + ulong server_version= mysql_get_server_version(connection); + + bool ret= true; + + mysql_variable mysql_vars[]= { + {"have_backup_locks", &have_backup_locks_var}, + {"log_bin", &log_bin_var}, + {"lock_wait_timeout", &lock_wait_timeout_var}, + {"gtid_mode", >id_mode_var}, + {"version", &version_var}, + {"wsrep_on", &wsrep_on_var}, + {"slave_parallel_workers", &slave_parallel_workers_var}, + {"gtid_slave_pos", >id_slave_pos_var}, + {"innodb_buffer_pool_filename", &innodb_buffer_pool_filename_var}, + {"datadir", &datadir_var}, + {"innodb_log_group_home_dir", &innodb_log_group_home_dir_var}, + {"innodb_log_file_size", &innodb_log_file_size_var}, + {"innodb_log_files_in_group", &innodb_log_files_in_group_var}, + {"innodb_data_file_path", &innodb_data_file_path_var}, + {"innodb_data_home_dir", &innodb_data_home_dir_var}, + {"innodb_undo_directory", &innodb_undo_directory_var}, + {"innodb_page_size", &innodb_page_size_var}, + {"innodb_undo_tablespaces", &innodb_undo_tablespaces_var}, + {"innodb_compression_level", &page_zip_level_var}, + {"ignore_db_dirs", &ignore_db_dirs}, + {"aria_log_dir_path", &aria_log_dir_path_var}, + {NULL, NULL}}; + + read_mysql_variables(connection, "SHOW VARIABLES", mysql_vars, true); + + if (have_backup_locks_var != NULL && !opt_no_backup_locks) + { + have_backup_locks= true; + } + + if (opt_binlog_info == BINLOG_INFO_AUTO) + { + if (log_bin_var != NULL && !strcmp(log_bin_var, "ON")) + opt_binlog_info= BINLOG_INFO_ON; + else + opt_binlog_info= BINLOG_INFO_OFF; + } + + if (lock_wait_timeout_var != NULL) + { + have_lock_wait_timeout= true; + } + + if (wsrep_on_var != NULL) + { + have_galera_enabled= true; + } + + /* Check server version compatibility */ + if (!(ret= check_server_version(server_version, version_var))) + { + goto out; + } + + mysql_server_version= server_version; + + if (slave_parallel_workers_var != NULL && + atoi(slave_parallel_workers_var) > 0) + { + have_multi_threaded_slave= true; + } + + if (innodb_buffer_pool_filename_var != NULL) + { + buffer_pool_filename= strdup(innodb_buffer_pool_filename_var); + } + + if ((gtid_mode_var && strcmp(gtid_mode_var, "ON") == 0) || + (gtid_slave_pos_var && *gtid_slave_pos_var)) + { + have_gtid_slave= true; + } + + msg("Using server version %s", version_var); + + if (!(ret= detect_mysql_capabilities_for_backup())) + { + goto out; + } + + /* make sure datadir value is the same in configuration file */ + if (check_if_param_set("datadir")) + { + if (!directory_exists(mysql_data_home, false)) + { + msg("Warning: option 'datadir' points to " + "nonexistent directory '%s'", + mysql_data_home); + } + if (!directory_exists(datadir_var, false)) + { + msg("Warning: MariaDB variable 'datadir' points to " + "nonexistent directory '%s'", + datadir_var); + } + if (!equal_paths(mysql_data_home, datadir_var)) + { + msg("Warning: option 'datadir' has different " + "values:\n" + " '%s' in defaults file\n" + " '%s' in SHOW VARIABLES", + mysql_data_home, datadir_var); + } + } + + /* get some default values is they are missing from my.cnf */ + if (datadir_var && *datadir_var) + { + strmake(mysql_real_data_home, datadir_var, FN_REFLEN - 1); + mysql_data_home= mysql_real_data_home; + } + + if (innodb_data_file_path_var && *innodb_data_file_path_var) + innobase_data_file_path= my_strdup(PSI_NOT_INSTRUMENTED, + innodb_data_file_path_var, MYF(MY_FAE)); + + if (innodb_data_home_dir_var) + innobase_data_home_dir= my_strdup(PSI_NOT_INSTRUMENTED, + innodb_data_home_dir_var, MYF(MY_FAE)); + + if (innodb_log_group_home_dir_var && *innodb_log_group_home_dir_var) + srv_log_group_home_dir= my_strdup(PSI_NOT_INSTRUMENTED, + innodb_log_group_home_dir_var, + MYF(MY_FAE)); + + if (innodb_undo_directory_var && *innodb_undo_directory_var) + srv_undo_dir= my_strdup(PSI_NOT_INSTRUMENTED, innodb_undo_directory_var, + MYF(MY_FAE)); + + if (innodb_log_file_size_var) + { + srv_log_file_size= strtoll(innodb_log_file_size_var, &endptr, 10); + ut_ad(*endptr == 0); + } + + if (innodb_page_size_var) + { + innobase_page_size= strtoll(innodb_page_size_var, &endptr, 10); + ut_ad(*endptr == 0); + } + + if (innodb_undo_tablespaces_var) + { + srv_undo_tablespaces= static_cast<uint32_t> + (strtoul(innodb_undo_tablespaces_var, &endptr, 10)); + ut_ad(*endptr == 0); + } + + if (aria_log_dir_path_var) + { + aria_log_dir_path= my_strdup(PSI_NOT_INSTRUMENTED, + aria_log_dir_path_var, MYF(MY_FAE)); + } + + if (page_zip_level_var != NULL) + { + page_zip_level= static_cast<uint>(strtoul(page_zip_level_var, &endptr, + 10)); + ut_ad(*endptr == 0); + } + + if (ignore_db_dirs) + xb_load_list_string(ignore_db_dirs, ",", register_ignore_db_dirs_filter); + +out: + free_mysql_variables(mysql_vars); + + return (ret); +} + +/*********************************************************************//** +Query the server to find out what backup capabilities it supports. +@return true on success. */ +bool +detect_mysql_capabilities_for_backup() +{ + const char *query = "SELECT 'INNODB_CHANGED_PAGES', COUNT(*) FROM " + "INFORMATION_SCHEMA.PLUGINS " + "WHERE PLUGIN_NAME LIKE 'INNODB_CHANGED_PAGES'"; + char *innodb_changed_pages = NULL; + mysql_variable vars[] = { + {"INNODB_CHANGED_PAGES", &innodb_changed_pages}, {NULL, NULL}}; + + if (xtrabackup_incremental) { + + read_mysql_variables(mysql_connection, query, vars, true); + + ut_ad(innodb_changed_pages != NULL); + + have_changed_page_bitmaps = (atoi(innodb_changed_pages) == 1); + + free_mysql_variables(vars); + } + + /* do some sanity checks */ + if (opt_galera_info && !have_galera_enabled) { + msg("--galera-info is specified on the command " + "line, but the server does not support Galera " + "replication. Ignoring the option."); + opt_galera_info = false; + } + + if (opt_slave_info && have_multi_threaded_slave && + !have_gtid_slave) { + msg("The --slave-info option requires GTID enabled for a " + "multi-threaded slave."); + return(false); + } + + return(true); +} + +static +bool +select_incremental_lsn_from_history(lsn_t *incremental_lsn) +{ + MYSQL_RES *mysql_result; + char query[1000]; + char buf[100]; + + if (opt_incremental_history_name) { + mysql_real_escape_string(mysql_connection, buf, + opt_incremental_history_name, + (unsigned long)strlen(opt_incremental_history_name)); + snprintf(query, sizeof(query), + "SELECT innodb_to_lsn " + "FROM " XB_HISTORY_TABLE " " + "WHERE name = '%s' " + "AND innodb_to_lsn IS NOT NULL " + "ORDER BY innodb_to_lsn DESC LIMIT 1", + buf); + } + + if (opt_incremental_history_uuid) { + mysql_real_escape_string(mysql_connection, buf, + opt_incremental_history_uuid, + (unsigned long)strlen(opt_incremental_history_uuid)); + snprintf(query, sizeof(query), + "SELECT innodb_to_lsn " + "FROM " XB_HISTORY_TABLE " " + "WHERE uuid = '%s' " + "AND innodb_to_lsn IS NOT NULL " + "ORDER BY innodb_to_lsn DESC LIMIT 1", + buf); + } + + mysql_result = xb_mysql_query(mysql_connection, query, true); + + ut_ad(mysql_num_fields(mysql_result) == 1); + const MYSQL_ROW row = mysql_fetch_row(mysql_result); + if (row) { + *incremental_lsn = strtoull(row[0], NULL, 10); + msg("Found and using lsn: " LSN_PF " for %s %s", + *incremental_lsn, + opt_incremental_history_uuid ? "uuid" : "name", + opt_incremental_history_uuid ? + opt_incremental_history_uuid : + opt_incremental_history_name); + } else { + msg("Error while attempting to find history record " + "for %s %s", + opt_incremental_history_uuid ? "uuid" : "name", + opt_incremental_history_uuid ? + opt_incremental_history_uuid : + opt_incremental_history_name); + } + + mysql_free_result(mysql_result); + + return(row != NULL); +} + +static +const char * +eat_sql_whitespace(const char *query) +{ + bool comment = false; + + while (*query) { + if (comment) { + if (query[0] == '*' && query[1] == '/') { + query += 2; + comment = false; + continue; + } + ++query; + continue; + } + if (query[0] == '/' && query[1] == '*') { + query += 2; + comment = true; + continue; + } + if (strchr("\t\n\r (", query[0])) { + ++query; + continue; + } + break; + } + + return(query); +} + +static +bool +is_query_from_list(const char *query, const char **list) +{ + const char **item; + + query = eat_sql_whitespace(query); + + item = list; + while (*item) { + if (strncasecmp(query, *item, strlen(*item)) == 0) { + return(true); + } + ++item; + } + + return(false); +} + +static +bool +is_query(const char *query) +{ + const char *query_list[] = {"insert", "update", "delete", "replace", + "alter", "load", "select", "do", "handler", "call", "execute", + "begin", NULL}; + + return is_query_from_list(query, query_list); +} + +static +bool +is_select_query(const char *query) +{ + const char *query_list[] = {"select", NULL}; + + return is_query_from_list(query, query_list); +} + +static +bool +is_update_query(const char *query) +{ + const char *query_list[] = {"insert", "update", "delete", "replace", + "alter", "load", NULL}; + + return is_query_from_list(query, query_list); +} + +static +bool +have_queries_to_wait_for(MYSQL *connection, uint threshold) +{ + MYSQL_RES *result = xb_mysql_query(connection, "SHOW FULL PROCESSLIST", + true); + const bool all_queries = (opt_lock_wait_query_type == QUERY_TYPE_ALL); + bool have_to_wait = false; + + while (MYSQL_ROW row = mysql_fetch_row(result)) { + const char *info = row[7]; + int duration = row[5] ? atoi(row[5]) : 0; + char *id = row[0]; + + if (info != NULL + && duration >= (int)threshold + && ((all_queries && is_query(info)) + || is_update_query(info))) { + msg("Waiting for query %s (duration %d sec): %s", + id, duration, info); + have_to_wait = true; + break; + } + } + + mysql_free_result(result); + return(have_to_wait); +} + +static +void +kill_long_queries(MYSQL *connection, time_t timeout) +{ + char kill_stmt[100]; + + MYSQL_RES *result = xb_mysql_query(connection, "SHOW FULL PROCESSLIST", + true); + const bool all_queries = (opt_kill_long_query_type == QUERY_TYPE_ALL); + while (MYSQL_ROW row = mysql_fetch_row(result)) { + const char *info = row[7]; + long long duration = row[5]? atoll(row[5]) : 0; + char *id = row[0]; + + if (info != NULL && + (time_t)duration >= timeout && + ((all_queries && is_query(info)) || + is_select_query(info))) { + msg("Killing query %s (duration %d sec): %s", + id, (int)duration, info); + snprintf(kill_stmt, sizeof(kill_stmt), + "KILL %s", id); + xb_mysql_query(connection, kill_stmt, false, false); + } + } + + mysql_free_result(result); +} + +static +bool +wait_for_no_updates(MYSQL *connection, uint timeout, uint threshold) +{ + time_t start_time; + + start_time = time(NULL); + + msg("Waiting %u seconds for queries running longer than %u seconds " + "to finish", timeout, threshold); + + while (time(NULL) <= (time_t)(start_time + timeout)) { + if (!have_queries_to_wait_for(connection, threshold)) { + return(true); + } + std::this_thread::sleep_for(std::chrono::seconds(1)); + } + + msg("Unable to obtain lock. Please try again later."); + + return(false); +} + +static void kill_query_thread() +{ + mysql_mutex_lock(&kill_query_thread_mutex); + + msg("Kill query timeout %d seconds.", opt_kill_long_queries_timeout); + + time_t start_time= time(nullptr); + timespec abstime; + set_timespec(abstime, opt_kill_long_queries_timeout); + + while (!kill_query_thread_stopping) + if (!mysql_cond_timedwait(&kill_query_thread_stop, + &kill_query_thread_mutex, &abstime)) + goto func_exit; + + if (MYSQL *mysql= xb_mysql_connect()) + { + do + { + kill_long_queries(mysql, time(nullptr) - start_time); + set_timespec(abstime, 1); + } + while (mysql_cond_timedwait(&kill_query_thread_stop, + &kill_query_thread_mutex, &abstime) && + !kill_query_thread_stopping); + mysql_close(mysql); + } + else + msg("Error: kill query thread failed"); + +func_exit: + msg("Kill query thread stopped"); + + kill_query_thread_running= false; + mysql_cond_signal(&kill_query_thread_stopped); + mysql_mutex_unlock(&kill_query_thread_mutex); +} + + +static void start_query_killer() +{ + ut_ad(!kill_query_thread_running); + kill_query_thread_running= true; + kill_query_thread_stopping= false; + mysql_mutex_init(0, &kill_query_thread_mutex, nullptr); + mysql_cond_init(0, &kill_query_thread_stop, nullptr); + mysql_cond_init(0, &kill_query_thread_stopped, nullptr); + std::thread(kill_query_thread).detach(); +} + +static void stop_query_killer() +{ + mysql_mutex_lock(&kill_query_thread_mutex); + kill_query_thread_stopping= true; + mysql_cond_signal(&kill_query_thread_stop); + + do + mysql_cond_wait(&kill_query_thread_stopped, &kill_query_thread_mutex); + while (kill_query_thread_running); + + mysql_cond_destroy(&kill_query_thread_stop); + mysql_cond_destroy(&kill_query_thread_stopped); + mysql_mutex_unlock(&kill_query_thread_mutex); + mysql_mutex_destroy(&kill_query_thread_mutex); +} + + +/*********************************************************************//** +Function acquires either a backup tables lock, if supported +by the server, or a global read lock (FLUSH TABLES WITH READ LOCK) +otherwise. +@returns true if lock acquired */ +bool lock_tables(MYSQL *connection) +{ + if (have_lock_wait_timeout || opt_lock_wait_timeout) + { + char buf[FN_REFLEN]; + /* Set the maximum supported session value for + lock_wait_timeout if opt_lock_wait_timeout is not set to prevent + unnecessary timeouts when the global value is changed from the default */ + snprintf(buf, sizeof(buf), "SET SESSION lock_wait_timeout=%u", + opt_lock_wait_timeout ? opt_lock_wait_timeout : 31536000); + xb_mysql_query(connection, buf, false); + } + + if (have_backup_locks) + { + msg("Executing LOCK TABLES FOR BACKUP..."); + xb_mysql_query(connection, "LOCK TABLES FOR BACKUP", false); + return (true); + } + + if (opt_lock_wait_timeout) + { + if (!wait_for_no_updates(connection, opt_lock_wait_timeout, + opt_lock_wait_threshold)) + { + return (false); + } + } + + msg("Acquiring BACKUP LOCKS..."); + + if (opt_kill_long_queries_timeout) + { + start_query_killer(); + } + + if (have_galera_enabled) + { + xb_mysql_query(connection, "SET SESSION wsrep_sync_wait=0", false); + } + + xb_mysql_query(connection, "BACKUP STAGE START", true); + DBUG_MARIABACKUP_EVENT("after_backup_stage_start", {}); + xb_mysql_query(connection, "BACKUP STAGE BLOCK_COMMIT", true); + DBUG_MARIABACKUP_EVENT("after_backup_stage_block_commit", {}); + /* Set the maximum supported session value for + lock_wait_timeout to prevent unnecessary timeouts when the + global value is changed from the default */ + if (opt_lock_wait_timeout) + xb_mysql_query(connection, "SET SESSION lock_wait_timeout=31536000", + false); + + if (opt_kill_long_queries_timeout) + { + stop_query_killer(); + } + + return (true); +} + +/*********************************************************************//** +If backup locks are used, execute LOCK BINLOG FOR BACKUP provided that we are +not in the --no-lock mode and the lock has not been acquired already. +@returns true if lock acquired */ +bool +lock_binlog_maybe(MYSQL *connection) +{ + if (have_backup_locks && !opt_no_lock && !binlog_locked) { + msg("Executing LOCK BINLOG FOR BACKUP..."); + xb_mysql_query(connection, "LOCK BINLOG FOR BACKUP", false); + binlog_locked = true; + + return(true); + } + + return(false); +} + + +/*********************************************************************//** +Releases either global read lock acquired with FTWRL and the binlog +lock acquired with LOCK BINLOG FOR BACKUP, depending on +the locking strategy being used */ +void +unlock_all(MYSQL *connection) +{ + if (opt_debug_sleep_before_unlock) { + msg("Debug sleep for %u seconds", + opt_debug_sleep_before_unlock); + std::this_thread::sleep_for( + std::chrono::milliseconds(opt_debug_sleep_before_unlock)); + } + + msg("Executing BACKUP STAGE END"); + xb_mysql_query(connection, "BACKUP STAGE END", false); + + msg("All tables unlocked"); +} + + +static +int +get_open_temp_tables(MYSQL *connection) +{ + char *slave_open_temp_tables = NULL; + mysql_variable status[] = { + {"Slave_open_temp_tables", &slave_open_temp_tables}, + {NULL, NULL} + }; + int result = false; + + read_mysql_variables(connection, + "SHOW STATUS LIKE 'slave_open_temp_tables'", status, true); + + result = slave_open_temp_tables ? atoi(slave_open_temp_tables) : 0; + + free_mysql_variables(status); + + return(result); +} + +/*********************************************************************//** +Wait until it's safe to backup a slave. Returns immediately if +the host isn't a slave. Currently there's only one check: +Slave_open_temp_tables has to be zero. Dies on timeout. */ +bool +wait_for_safe_slave(MYSQL *connection) +{ + char *read_master_log_pos = NULL; + char *slave_sql_running = NULL; + int n_attempts = 1; + const int sleep_time = 3; + int open_temp_tables = 0; + bool result = true; + + mysql_variable status[] = { + {"Read_Master_Log_Pos", &read_master_log_pos}, + {"Slave_SQL_Running", &slave_sql_running}, + {NULL, NULL} + }; + + sql_thread_started = false; + + read_mysql_variables(connection, "SHOW SLAVE STATUS", status, false); + + if (!(read_master_log_pos && slave_sql_running)) { + msg("Not checking slave open temp tables for " + "--safe-slave-backup because host is not a slave"); + goto cleanup; + } + + if (strcmp(slave_sql_running, "Yes") == 0) { + sql_thread_started = true; + xb_mysql_query(connection, "STOP SLAVE SQL_THREAD", false); + } + + if (opt_safe_slave_backup_timeout > 0) { + n_attempts = opt_safe_slave_backup_timeout / sleep_time; + } + + open_temp_tables = get_open_temp_tables(connection); + msg("Slave open temp tables: %d", open_temp_tables); + + while (open_temp_tables && n_attempts--) { + msg("Starting slave SQL thread, waiting %d seconds, then " + "checking Slave_open_temp_tables again (%d attempts " + "remaining)...", sleep_time, n_attempts); + + xb_mysql_query(connection, "START SLAVE SQL_THREAD", false); + std::this_thread::sleep_for(std::chrono::seconds(sleep_time)); + xb_mysql_query(connection, "STOP SLAVE SQL_THREAD", false); + + open_temp_tables = get_open_temp_tables(connection); + msg("Slave open temp tables: %d", open_temp_tables); + } + + /* Restart the slave if it was running at start */ + if (open_temp_tables == 0) { + msg("Slave is safe to backup"); + goto cleanup; + } + + result = false; + + if (sql_thread_started) { + msg("Restarting slave SQL thread."); + xb_mysql_query(connection, "START SLAVE SQL_THREAD", false); + } + + msg("Slave_open_temp_tables did not become zero after " + "%d seconds", opt_safe_slave_backup_timeout); + +cleanup: + free_mysql_variables(status); + + return(result); +} + + +class Var +{ + const char *m_name; + char *m_value; + /* + Disable copying constructors for safety, as the default binary copying + which would be wrong. If we ever want them, the m_value + member should be copied using an strdup()-alike function. + */ + Var(const Var &); // Disabled + Var(Var &); // Disabled +public: + ~Var() + { + free(m_value); + } + Var(const char *name) + :m_name(name), + m_value(NULL) + { } + // Init using a SHOW VARIABLES LIKE 'name' query + Var(const char *name, MYSQL *mysql) + :m_name(name) + { + char buf[128]; + my_snprintf(buf, sizeof(buf), "SHOW VARIABLES LIKE '%s'", m_name); + m_value= read_mysql_one_value(mysql, buf, 1/*offset*/, 2/*total columns*/); + } + /* + Init by name from a result set. + If the variable name is not found in the result set metadata field names, + it's value stays untouched. + */ + bool init(MYSQL_RES *mysql_result, MYSQL_ROW row) + { + MYSQL_FIELD *field= mysql_fetch_fields(mysql_result); + for (uint i= 0; i < mysql_num_fields(mysql_result); i++) + { + if (!strcmp(field[i].name, m_name)) + { + free(m_value); // In case it was initialized earlier + m_value= row[i] ? strdup(row[i]) : NULL; + return false; + } + } + return true; + } + void replace(char from, char to) + { + ut_ad(m_value); + for (char *ptr= strchr(m_value, from); ptr; ptr= strchr(ptr, from)) + *ptr= to; + } + + const char *value() const { return m_value; } + bool eq_value(const char *str, size_t length) const + { + return m_value && !strncmp(m_value, str, length) && m_value[length] == '\0'; + } + bool is_null_or_empty() const { return !m_value || !m_value[0]; } + bool print(String *to) const + { + ut_ad(m_value); + return to->append(m_value, strlen(m_value)); + } + bool print_quoted(String *to) const + { + ut_ad(m_value); + return to->append('\'') || to->append(m_value, strlen(m_value)) || + to->append('\''); + } + bool print_set_global(String *to) const + { + ut_ad(m_value); + return + to->append(STRING_WITH_LEN("SET GLOBAL ")) || + to->append(m_name, strlen(m_name)) || + to->append(STRING_WITH_LEN(" = '")) || + to->append(m_value, strlen(m_value)) || + to->append(STRING_WITH_LEN("';\n")); + } +}; + + +class Show_slave_status +{ + Var m_mariadb_connection_name; // MariaDB: e.g. 'master1' + Var m_master; // e.g. 'localhost' + Var m_filename; // e.g. 'source-bin.000002' + Var m_position; // a number + Var m_mysql_gtid_executed; // MySQL56: e.g. single '<UUID>:1-5" or multiline + // '<UUID1>:1-10,\n<UUID2>:1-20\n<UUID3>:1-30' + Var m_mariadb_using_gtid; // MariaDB: 'No','Slave_Pos','Current_Pos' + +public: + + Show_slave_status() + :m_mariadb_connection_name("Connection_name"), + m_master("Master_Host"), + m_filename("Relay_Master_Log_File"), + m_position("Exec_Master_Log_Pos"), + m_mysql_gtid_executed("Executed_Gtid_Set"), + m_mariadb_using_gtid("Using_Gtid") + { } + + void init(MYSQL_RES *res, MYSQL_ROW row) + { + m_mariadb_connection_name.init(res, row); + m_master.init(res, row); + m_filename.init(res, row); + m_position.init(res, row); + m_mysql_gtid_executed.init(res, row); + m_mariadb_using_gtid.init(res, row); + // Normalize + if (m_mysql_gtid_executed.value()) + m_mysql_gtid_executed.replace('\n', ' '); + } + + static void msg_is_not_slave() + { + msg("Failed to get master binlog coordinates " + "from SHOW SLAVE STATUS.This means that the server is not a " + "replication slave. Ignoring the --slave-info option"); + } + + bool is_mariadb_using_gtid() const + { + return !m_mariadb_using_gtid.eq_value("No", 2); + } + + static bool start_comment_chunk(String *to) + { + return to->length() ? to->append(STRING_WITH_LEN("; ")) : false; + } + + bool print_connection_name_if_set(String *to) const + { + if (!m_mariadb_connection_name.is_null_or_empty()) + return m_mariadb_connection_name.print_quoted(to) || to->append(' '); + return false; + } + + bool print_comment_master_identity(String *comment) const + { + if (comment->append(STRING_WITH_LEN("master "))) + return true; + if (!m_mariadb_connection_name.is_null_or_empty()) + return m_mariadb_connection_name.print_quoted(comment); + return comment->append(STRING_WITH_LEN("''")); // Default not named master + } + + bool print_using_master_log_pos(String *sql, String *comment) const + { + return + sql->append(STRING_WITH_LEN("CHANGE MASTER ")) || + print_connection_name_if_set(sql) || + sql->append(STRING_WITH_LEN("TO MASTER_LOG_FILE=")) || + m_filename.print_quoted(sql) || + sql->append(STRING_WITH_LEN(", MASTER_LOG_POS=")) || + m_position.print(sql) || + sql->append(STRING_WITH_LEN(";\n")) || + print_comment_master_identity(comment) || + comment->append(STRING_WITH_LEN(" filename ")) || + m_filename.print_quoted(comment) || + comment->append(STRING_WITH_LEN(" position ")) || + m_position.print_quoted(comment); + } + + bool print_mysql56(String *sql, String *comment) const + { + /* + SET @@GLOBAL.gtid_purged = '2174B383-5441-11E8-B90A-C80AA9429562:1-1029, ' + '224DA167-0C0C-11E8-8442-00059A3C7B00:1-2695'; + CHANGE MASTER TO MASTER_AUTO_POSITION=1; + */ + return + sql->append(STRING_WITH_LEN("SET GLOBAL gtid_purged=")) || + m_mysql_gtid_executed.print_quoted(sql) || + sql->append(STRING_WITH_LEN(";\n")) || + sql->append(STRING_WITH_LEN("CHANGE MASTER TO MASTER_AUTO_POSITION=1;\n")) || + print_comment_master_identity(comment) || + comment->append(STRING_WITH_LEN(" purge list ")) || + m_mysql_gtid_executed.print_quoted(comment); + } + + bool print_mariadb10_using_gtid(String *sql, String *comment) const + { + return + sql->append(STRING_WITH_LEN("CHANGE MASTER ")) || + print_connection_name_if_set(sql) || + sql->append(STRING_WITH_LEN("TO master_use_gtid = slave_pos;\n")) || + print_comment_master_identity(comment) || + comment->append(STRING_WITH_LEN(" master_use_gtid = slave_pos")); + } + + bool print(String *sql, String *comment, const Var >id_slave_pos) const + { + if (!m_mysql_gtid_executed.is_null_or_empty()) + { + /* MySQL >= 5.6 with GTID enabled */ + return print_mysql56(sql, comment); + } + + if (!gtid_slave_pos.is_null_or_empty() && is_mariadb_using_gtid()) + { + /* MariaDB >= 10.0 with GTID enabled */ + return print_mariadb10_using_gtid(sql, comment); + } + + return print_using_master_log_pos(sql, comment); + } + + /* + Get master info into strings "sql" and "comment" from a MYSQL_RES. + @return false on success + @return true on error + */ + static bool get_slave_info(MYSQL_RES *show_slave_info_result, + const Var >id_slave_pos, + String *sql, String *comment) + { + if (!gtid_slave_pos.is_null_or_empty()) + { + // Print gtid_slave_pos if any of the masters really needs it. + while (MYSQL_ROW row= mysql_fetch_row(show_slave_info_result)) + { + Show_slave_status status; + status.init(show_slave_info_result, row); + if (status.is_mariadb_using_gtid()) + { + if (gtid_slave_pos.print_set_global(sql) || + comment->append(STRING_WITH_LEN("gtid_slave_pos ")) || + gtid_slave_pos.print_quoted(comment)) + return true; // Error + break; + } + } + } + + // Print the list of masters + mysql_data_seek(show_slave_info_result, 0); + while (MYSQL_ROW row= mysql_fetch_row(show_slave_info_result)) + { + Show_slave_status status; + status.init(show_slave_info_result, row); + if (start_comment_chunk(comment) || + status.print(sql, comment, gtid_slave_pos)) + return true; // Error + } + return false; // Success + } + + /* + Get master info into strings "sql" and "comment". + @return false on success + @return true on error + */ + static bool get_slave_info(MYSQL *mysql, bool show_all_slave_status, + String *sql, String *comment) + { + bool rc= false; // Success + // gtid_slave_pos - MariaDB variable : e.g. "0-1-1" or "1-10-100,2-20-500" + Var gtid_slave_pos("gtid_slave_pos", mysql); + const char *query= show_all_slave_status ? "SHOW ALL SLAVES STATUS" : + "SHOW SLAVE STATUS"; + MYSQL_RES *mysql_result= xb_mysql_query(mysql, query, true); + if (!mysql_num_rows(mysql_result)) + { + msg_is_not_slave(); + // Don't change rc, we still want to continue the backup + } + else + { + rc= get_slave_info(mysql_result, gtid_slave_pos, sql, comment); + } + mysql_free_result(mysql_result); + return rc; + } +}; + + + +/*********************************************************************//** +Retrieves MySQL binlog position of the master server in a replication +setup and saves it in a file. It also saves it in mysql_slave_position +variable. +@returns false on error +@returns true on success +*/ +bool +write_slave_info(ds_ctxt *datasink, MYSQL *connection) +{ + String sql, comment; + + if (Show_slave_status::get_slave_info(connection, true, &sql, &comment)) + return false; // Error + + if (!sql.length()) + { + /* + SHOW [ALL] SLAVE STATUS returned no rows. + Don't create the file, but return success to continue the backup. + */ + return true; // Success + } + + mysql_slave_position= strdup(comment.c_ptr()); + return datasink->backup_file_print_buf(XTRABACKUP_SLAVE_INFO, + sql.ptr(), sql.length()); +} + + +/*********************************************************************//** +Retrieves MySQL Galera and +saves it in a file. It also prints it to stdout. */ +bool +write_galera_info(ds_ctxt *datasink, MYSQL *connection) +{ + char *state_uuid = NULL, *state_uuid55 = NULL; + char *last_committed = NULL, *last_committed55 = NULL; + bool result; + + mysql_variable status[] = { + {"Wsrep_local_state_uuid", &state_uuid}, + {"wsrep_local_state_uuid", &state_uuid55}, + {"Wsrep_last_committed", &last_committed}, + {"wsrep_last_committed", &last_committed55}, + {NULL, NULL} + }; + + /* When backup locks are supported by the server, we should skip + creating xtrabackup_galera_info file on the backup stage, because + wsrep_local_state_uuid and wsrep_last_committed will be inconsistent + without blocking commits. The state file will be created on the prepare + stage using the WSREP recovery procedure. */ + if (have_backup_locks) { + return(true); + } + + read_mysql_variables(connection, "SHOW STATUS", status, true); + + if ((state_uuid == NULL && state_uuid55 == NULL) + || (last_committed == NULL && last_committed55 == NULL)) { + msg("Warning: failed to get master wsrep state from SHOW STATUS."); + result = true; + goto cleanup; + } + + result = datasink->backup_file_printf(XTRABACKUP_GALERA_INFO, + "%s:%s\n", state_uuid ? state_uuid : state_uuid55, + last_committed ? last_committed : last_committed55); + if (result) + { + write_current_binlog_file(datasink, connection); + } + +cleanup: + free_mysql_variables(status); + + return(result); +} + + +/*********************************************************************//** +Flush and copy the current binary log file into the backup, +if GTID is enabled */ +bool +write_current_binlog_file(ds_ctxt *datasink, MYSQL *connection) +{ + char *executed_gtid_set = NULL; + char *gtid_binlog_state = NULL; + char *log_bin_file = NULL; + char *log_bin_dir = NULL; + bool gtid_exists; + bool result = true; + char filepath[FN_REFLEN]; + + mysql_variable status[] = { + {"Executed_Gtid_Set", &executed_gtid_set}, + {NULL, NULL} + }; + + mysql_variable status_after_flush[] = { + {"File", &log_bin_file}, + {NULL, NULL} + }; + + mysql_variable vars[] = { + {"gtid_binlog_state", >id_binlog_state}, + {"log_bin_basename", &log_bin_dir}, + {NULL, NULL} + }; + + read_mysql_variables(connection, "SHOW MASTER STATUS", status, false); + read_mysql_variables(connection, "SHOW VARIABLES", vars, true); + + gtid_exists = (executed_gtid_set && *executed_gtid_set) + || (gtid_binlog_state && *gtid_binlog_state); + + if (gtid_exists) { + size_t log_bin_dir_length; + + lock_binlog_maybe(connection); + + xb_mysql_query(connection, "FLUSH BINARY LOGS", false); + + read_mysql_variables(connection, "SHOW MASTER STATUS", + status_after_flush, false); + + if (opt_log_bin != NULL && strchr(opt_log_bin, FN_LIBCHAR)) { + /* If log_bin is set, it has priority */ + if (log_bin_dir) { + free(log_bin_dir); + } + log_bin_dir = strdup(opt_log_bin); + } else if (log_bin_dir == NULL) { + /* Default location is MySQL datadir */ + log_bin_dir = strdup("./"); + } + + dirname_part(log_bin_dir, log_bin_dir, &log_bin_dir_length); + + /* strip final slash if it is not the only path component */ + if (log_bin_dir_length > 1 && + log_bin_dir[log_bin_dir_length - 1] == FN_LIBCHAR) { + log_bin_dir[log_bin_dir_length - 1] = 0; + } + + if (log_bin_dir == NULL || log_bin_file == NULL) { + msg("Failed to get master binlog coordinates from " + "SHOW MASTER STATUS"); + result = false; + goto cleanup; + } + + snprintf(filepath, sizeof(filepath), "%s%c%s", + log_bin_dir, FN_LIBCHAR, log_bin_file); + result = datasink->copy_file(filepath, log_bin_file, 0); + } + +cleanup: + free_mysql_variables(status_after_flush); + free_mysql_variables(status); + free_mysql_variables(vars); + + return(result); +} + + +/*********************************************************************//** +Retrieves MySQL binlog position and +saves it in a file. It also prints it to stdout. */ +bool +write_binlog_info(ds_ctxt *datasink, MYSQL *connection) +{ + char *filename = NULL; + char *position = NULL; + char *gtid_mode = NULL; + char *gtid_current_pos = NULL; + char *gtid_executed = NULL; + char *gtid = NULL; + bool result; + bool mysql_gtid; + bool mariadb_gtid; + + mysql_variable status[] = { + {"File", &filename}, + {"Position", &position}, + {"Executed_Gtid_Set", >id_executed}, + {NULL, NULL} + }; + + mysql_variable vars[] = { + {"gtid_mode", >id_mode}, + {"gtid_current_pos", >id_current_pos}, + {NULL, NULL} + }; + + read_mysql_variables(connection, "SHOW MASTER STATUS", status, false); + read_mysql_variables(connection, "SHOW VARIABLES", vars, true); + + if (filename == NULL || position == NULL) { + /* Do not create xtrabackup_binlog_info if binary + log is disabled */ + result = true; + goto cleanup; + } + + mysql_gtid = ((gtid_mode != NULL) && (strcmp(gtid_mode, "ON") == 0)); + mariadb_gtid = (gtid_current_pos != NULL); + + gtid = (gtid_executed != NULL ? gtid_executed : gtid_current_pos); + + if (mariadb_gtid || mysql_gtid) { + ut_a(asprintf(&mysql_binlog_position, + "filename '%s', position '%s', " + "GTID of the last change '%s'", + filename, position, gtid) != -1); + result = datasink->backup_file_printf(XTRABACKUP_BINLOG_INFO, + "%s\t%s\t%s\n", filename, position, + gtid); + } else { + ut_a(asprintf(&mysql_binlog_position, + "filename '%s', position '%s'", + filename, position) != -1); + result = datasink->backup_file_printf(XTRABACKUP_BINLOG_INFO, + "%s\t%s\n", filename, position); + } + +cleanup: + free_mysql_variables(status); + free_mysql_variables(vars); + + return(result); +} + +struct escape_and_quote +{ + escape_and_quote(MYSQL *mysql, const char *str) + : mysql(mysql), str(str) {} + MYSQL * const mysql; + const char * const str; +}; + +static +std::ostream& +operator<<(std::ostream& s, const escape_and_quote& eq) +{ + if (!eq.str) + return s << "NULL"; + s << '\''; + size_t len = strlen(eq.str); + char* escaped = (char *)alloca(2 * len + 1); + len = mysql_real_escape_string(eq.mysql, escaped, eq.str, (ulong)len); + s << std::string(escaped, len); + s << '\''; + return s; +} + +/*********************************************************************//** +Writes xtrabackup_info file and if backup_history is enable creates +mysql.mariabackup_history and writes a new history record to the +table containing all the history info particular to the just completed +backup. */ +bool +write_xtrabackup_info(ds_ctxt *datasink, + MYSQL *connection, const char * filename, bool history, + bool stream) +{ + + bool result = true; + FILE *fp = NULL; + char *uuid = NULL; + char *server_version = NULL; + char buf_start_time[100]; + char buf_end_time[100]; + tm tm; + std::ostringstream oss; + const char *xb_stream_name[] = {"file", "tar", "xbstream"}; + + uuid = read_mysql_one_value(connection, "SELECT UUID()"); + server_version = read_mysql_one_value(connection, "SELECT VERSION()"); + localtime_r(&history_start_time, &tm); + strftime(buf_start_time, sizeof(buf_start_time), + "%Y-%m-%d %H:%M:%S", &tm); + history_end_time = time(NULL); + localtime_r(&history_end_time, &tm); + strftime(buf_end_time, sizeof(buf_end_time), + "%Y-%m-%d %H:%M:%S", &tm); + bool is_partial = (xtrabackup_tables + || xtrabackup_tables_file + || xtrabackup_databases + || xtrabackup_databases_file + || xtrabackup_tables_exclude + || xtrabackup_databases_exclude + ); + + char *buf = NULL; + int buf_len = asprintf(&buf, + "uuid = %s\n" + "name = %s\n" + "tool_name = %s\n" + "tool_command = %s\n" + "tool_version = %s\n" + "ibbackup_version = %s\n" + "server_version = %s\n" + "start_time = %s\n" + "end_time = %s\n" + "lock_time = %d\n" + "binlog_pos = %s\n" + "innodb_from_lsn = " LSN_PF "\n" + "innodb_to_lsn = " LSN_PF "\n" + "partial = %s\n" + "incremental = %s\n" + "format = %s\n" + "compressed = %s\n", + uuid, /* uuid */ + opt_history ? opt_history : "", /* name */ + tool_name, /* tool_name */ + tool_args, /* tool_command */ + MYSQL_SERVER_VERSION, /* tool_version */ + MYSQL_SERVER_VERSION, /* ibbackup_version */ + server_version, /* server_version */ + buf_start_time, /* start_time */ + buf_end_time, /* end_time */ + (int)history_lock_time, /* lock_time */ + mysql_binlog_position ? + mysql_binlog_position : "", /* binlog_pos */ + incremental_lsn, + /* innodb_from_lsn */ + metadata_to_lsn, + /* innodb_to_lsn */ + is_partial? "Y" : "N", + xtrabackup_incremental ? "Y" : "N", /* incremental */ + xb_stream_name[xtrabackup_stream_fmt], /* format */ + xtrabackup_compress ? "compressed" : "N"); /* compressed */ + if (buf_len < 0) { + msg("Error: cannot generate xtrabackup_info"); + result = false; + goto cleanup; + } + + if (stream) { + datasink->backup_file_printf(filename, "%s", buf); + } else { + fp = fopen(filename, "w"); + if (!fp) { + msg("Error: cannot open %s", filename); + result = false; + goto cleanup; + } + if (fwrite(buf, buf_len, 1, fp) < 1) { + result = false; + goto cleanup; + } + } + + if (!history) { + goto cleanup; + } + + xb_mysql_query(connection, + "CREATE TABLE IF NOT EXISTS " XB_HISTORY_TABLE "(" + "uuid VARCHAR(40) NOT NULL PRIMARY KEY," + "name VARCHAR(255) DEFAULT NULL," + "tool_name VARCHAR(255) DEFAULT NULL," + "tool_command TEXT DEFAULT NULL," + "tool_version VARCHAR(255) DEFAULT NULL," + "ibbackup_version VARCHAR(255) DEFAULT NULL," + "server_version VARCHAR(255) DEFAULT NULL," + "start_time TIMESTAMP NULL DEFAULT NULL," + "end_time TIMESTAMP NULL DEFAULT NULL," + "lock_time BIGINT UNSIGNED DEFAULT NULL," + "binlog_pos VARCHAR(128) DEFAULT NULL," + "innodb_from_lsn BIGINT UNSIGNED DEFAULT NULL," + "innodb_to_lsn BIGINT UNSIGNED DEFAULT NULL," + "partial ENUM('Y', 'N') DEFAULT NULL," + "incremental ENUM('Y', 'N') DEFAULT NULL," + "format ENUM('file', 'tar', 'xbstream') DEFAULT NULL," + "compressed ENUM('Y', 'N') DEFAULT NULL" + ") CHARACTER SET utf8 ENGINE=innodb", false); + + +#define ESCAPE_BOOL(expr) ((expr)?"'Y'":"'N'") + + oss << "insert into " XB_HISTORY_TABLE "(" + << "uuid, name, tool_name, tool_command, tool_version," + << "ibbackup_version, server_version, start_time, end_time," + << "lock_time, binlog_pos, innodb_from_lsn, innodb_to_lsn," + << "partial, incremental, format, compressed) " + << "values(" + << escape_and_quote(connection, uuid) << "," + << escape_and_quote(connection, opt_history) << "," + << escape_and_quote(connection, tool_name) << "," + << escape_and_quote(connection, tool_args) << "," + << escape_and_quote(connection, MYSQL_SERVER_VERSION) << "," + << escape_and_quote(connection, MYSQL_SERVER_VERSION) << "," + << escape_and_quote(connection, server_version) << "," + << "from_unixtime(" << history_start_time << ")," + << "from_unixtime(" << history_end_time << ")," + << history_lock_time << "," + << escape_and_quote(connection, mysql_binlog_position) << "," + << incremental_lsn << "," + << metadata_to_lsn << "," + << ESCAPE_BOOL(is_partial) << "," + << ESCAPE_BOOL(xtrabackup_incremental)<< "," + << escape_and_quote(connection,xb_stream_name[xtrabackup_stream_fmt]) <<"," + << ESCAPE_BOOL(xtrabackup_compress) << ")"; + + xb_mysql_query(mysql_connection, oss.str().c_str(), false); + +cleanup: + + free(uuid); + free(server_version); + free(buf); + if (fp) + fclose(fp); + + return(result); +} + +extern const char *innodb_checksum_algorithm_names[]; + +#ifdef _WIN32 +#include <algorithm> +#endif + +static std::string make_local_paths(const char *data_file_path) +{ + if (strchr(data_file_path, '/') == 0 +#ifdef _WIN32 + && strchr(data_file_path, '\\') == 0 +#endif + ){ + return std::string(data_file_path); + } + + std::ostringstream buf; + + char *dup = strdup(innobase_data_file_path); + ut_a(dup); + char *p; + char * token = strtok_r(dup, ";", &p); + while (token) { + if (buf.tellp()) + buf << ";"; + + char *fname = strrchr(token, '/'); +#ifdef _WIN32 + fname = std::max(fname,strrchr(token, '\\')); +#endif + if (fname) + buf << fname + 1; + else + buf << token; + token = strtok_r(NULL, ";", &p); + } + free(dup); + return buf.str(); +} + +bool write_backup_config_file(ds_ctxt *datasink) +{ + int rc= datasink->backup_file_printf("backup-my.cnf", + "# This options file was generated by innobackupex.\n\n" + "# The server\n" + "[mysqld]\n" + "innodb_checksum_algorithm=%s\n" + "innodb_data_file_path=%s\n" + "innodb_log_file_size=%llu\n" + "innodb_page_size=%lu\n" + "innodb_undo_directory=%s\n" + "innodb_undo_tablespaces=%u\n" + "innodb_compression_level=%u\n" + "%s%s\n" + "%s\n", + innodb_checksum_algorithm_names[srv_checksum_algorithm], + make_local_paths(innobase_data_file_path).c_str(), + srv_log_file_size, + srv_page_size, + srv_undo_dir, + srv_undo_tablespaces, + page_zip_level, + innobase_buffer_pool_filename ? + "innodb_buffer_pool_filename=" : "", + innobase_buffer_pool_filename ? + innobase_buffer_pool_filename : "", + xb_plugin_get_config()); + return rc; +} + + +static +char *make_argv(char *buf, size_t len, int argc, char **argv) +{ + size_t left= len; + const char *arg; + + buf[0]= 0; + ++argv; --argc; + while (argc > 0 && left > 0) + { + arg = *argv; + if (strncmp(*argv, "--password", strlen("--password")) == 0) { + arg = "--password=..."; + } + left-= snprintf(buf + len - left, left, + "%s%c", arg, argc > 1 ? ' ' : 0); + ++argv; --argc; + } + + return buf; +} + +void +capture_tool_command(int argc, char **argv) +{ + /* capture tool name tool args */ + tool_name = strrchr(argv[0], '/'); + tool_name = tool_name ? tool_name + 1 : argv[0]; + + make_argv(tool_args, sizeof(tool_args), argc, argv); +} + + +bool +select_history() +{ + if (opt_incremental_history_name || opt_incremental_history_uuid) { + if (!select_incremental_lsn_from_history( + &incremental_lsn)) { + return(false); + } + } + return(true); +} + +bool +flush_changed_page_bitmaps() +{ + if (xtrabackup_incremental && have_changed_page_bitmaps && + !xtrabackup_incremental_force_scan) { + xb_mysql_query(mysql_connection, + "FLUSH NO_WRITE_TO_BINLOG CHANGED_PAGE_BITMAPS", false); + } + return(true); +} + + +/*********************************************************************//** +Deallocate memory, disconnect from server, etc. +@return true on success. */ +void +backup_cleanup() +{ + free(mysql_slave_position); + free(mysql_binlog_position); + free(buffer_pool_filename); + + if (mysql_connection) { + mysql_close(mysql_connection); + } +} + + +static MYSQL *mdl_con = NULL; + +std::map<ulint, std::string> spaceid_to_tablename; + +void +mdl_lock_init() +{ + mdl_con = xb_mysql_connect(); + if (!mdl_con) + { + msg("FATAL: cannot create connection for MDL locks"); + exit(1); + } + const char *query = + "SELECT NAME, SPACE FROM INFORMATION_SCHEMA.INNODB_SYS_TABLES WHERE NAME LIKE '%%/%%'"; + + MYSQL_RES *mysql_result = xb_mysql_query(mdl_con, query, true, true); + while (MYSQL_ROW row = mysql_fetch_row(mysql_result)) { + int err; + ulint id = (ulint)my_strtoll10(row[1], 0, &err); + spaceid_to_tablename[id] = ut_get_name(0, row[0]); + } + mysql_free_result(mysql_result); + + xb_mysql_query(mdl_con, "BEGIN", false, true); +} + +void +mdl_lock_table(ulint space_id) +{ + if (space_id == 0) + return; + + std::string full_table_name = spaceid_to_tablename[space_id]; + + DBUG_EXECUTE_IF("rename_during_mdl_lock_table", + if (full_table_name == "`test`.`t1`") + xb_mysql_query(mysql_connection, "RENAME TABLE test.t1 to test.t2", false, true); + ); + + std::ostringstream lock_query; + lock_query << "SELECT 1 FROM " << full_table_name << " LIMIT 0"; + msg("Locking MDL for %s", full_table_name.c_str()); + if (mysql_query(mdl_con, lock_query.str().c_str())) { + msg("Warning : locking MDL failed for space id %zu, name %s", space_id, full_table_name.c_str()); + } else { + MYSQL_RES *r = mysql_store_result(mdl_con); + mysql_free_result(r); + } +} + +void +mdl_unlock_all() +{ + msg("Unlocking MDL for all tables"); + xb_mysql_query(mdl_con, "COMMIT", false, true); + mysql_close(mdl_con); + spaceid_to_tablename.clear(); +} |