backup_mysql.cc 48.6 KB
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/******************************************************
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
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1335  USA
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*******************************************************

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
Vicențiu Ciorbaru's avatar
Vicențiu Ciorbaru committed
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this program; if not, write to the Free Software Foundation, Inc., 51 Franklin
Street, Fifth Floor, Boston, MA 02110-1335 USA
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*******************************************************/
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#define MYSQL_CLIENT
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#include <my_global.h>
#include <mysql.h>
#include <mysqld.h>
#include <my_sys.h>
#include <string.h>
#include <limits>
#include "common.h"
#include "xtrabackup.h"
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#include "srv0srv.h"
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#include "mysql_version.h"
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#include "backup_copy.h"
#include "backup_mysql.h"
#include "mysqld.h"
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#include "encryption_plugin.h"
#include <sstream>
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#include <sql_error.h>
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#include "page0zip.h"
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char *tool_name;
char tool_args[2048];

/* mysql flavor and version */
mysql_flavor_t server_flavor = FLAVOR_UNKNOWN;
unsigned long mysql_server_version = 0;

/* 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_flush_engine_logs = false;
bool have_multi_threaded_slave = false;
bool have_gtid_slave = false;

/* Kill long selects */
os_thread_id_t	kill_query_thread_id;
os_event_t	kill_query_thread_started;
os_event_t	kill_query_thread_stopped;
os_event_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;

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extern my_bool opt_ssl_verify_server_cert, opt_use_ssl;
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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) {
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		msg("Failed to init MySQL struct: %s.",
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			mysql_error(connection));
		return(NULL);
	}

	if (!opt_secure_auth) {
		mysql_options(connection, MYSQL_SECURE_AUTH,
			      (char *) &opt_secure_auth);
	}

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	if (xb_plugin_dir && *xb_plugin_dir){
		mysql_options(connection, MYSQL_PLUGIN_DIR, xb_plugin_dir);
	}
	mysql_options(connection, MYSQL_OPT_PROTOCOL, &opt_protocol);
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	mysql_options(connection,MYSQL_SET_CHARSET_NAME, "utf8");
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	msg("Connecting to MySQL server host: %s, user: %s, password: %s, "
	       "port: %s, socket: %s", opt_host ? opt_host : "localhost",
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	       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)
	{
		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)) {
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		msg("Failed to connect to MySQL server: %s.", mysql_error(connection));
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		mysql_close(connection);
		return(NULL);
	}

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	xb_mysql_query(connection, "SET SESSION wait_timeout=2147483, max_statement_time=0",
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		       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) {
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			die("failed to execute query %s: %s", query, mysql_error(connection));
		} else {
			msg("Error: failed to execute query %s: %s", query, mysql_error(connection));
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		}
		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) {
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			die("failed to fetch query result %s: %s",
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				query, mysql_error(connection));
		}

		if (!use_result) {
			mysql_free_result(mysql_result);
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			mysql_result = NULL;
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		}
	}

	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)
{
	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) == 1);

	if ((row = mysql_fetch_row(mysql_result))) {
		result = strdup(row[0]);
	}

	mysql_free_result(mysql_result);

	return(result);
}

static
bool
check_server_version(unsigned long version_number,
		     const char *version_string,
		     const char *version_comment,
		     const char *innodb_version)
{
	bool version_supported = false;
	bool mysql51 = false;

	mysql_server_version = version_number;

	server_flavor = FLAVOR_UNKNOWN;
	if (strstr(version_comment, "Percona") != NULL) {
		server_flavor = FLAVOR_PERCONA_SERVER;
	} else if (strstr(version_comment, "MariaDB") != NULL ||
		   strstr(version_string, "MariaDB") != NULL) {
		server_flavor = FLAVOR_MARIADB;
	} else if (strstr(version_comment, "MySQL") != NULL) {
		server_flavor = FLAVOR_MYSQL;
	}

	mysql51 = version_number > 50100 && version_number < 50500;
	version_supported = version_supported
		|| (mysql51 && innodb_version != NULL);
	version_supported = version_supported
		|| (version_number > 50500 && version_number < 50700);
	version_supported = version_supported
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		|| ((version_number > 100000)
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		    && server_flavor == FLAVOR_MARIADB);

	if (mysql51 && innodb_version == NULL) {
		msg("Error: Built-in InnoDB in MySQL 5.1 is not "
		    "supported in this release. You can either use "
		    "Percona XtraBackup 2.0, or upgrade to InnoDB "
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		    "plugin.");
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	} else if (!version_supported) {
		msg("Error: Unsupported server version: '%s'. Please "
		    "report a bug at "
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		    "https://bugs.launchpad.net/percona-xtrabackup",
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		    version_string);
	}

	return(version_supported);
}

/*********************************************************************//**
Receive options important for XtraBackup from MySQL server.
@return	true on success. */
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bool get_mysql_vars(MYSQL *connection)
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{
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  char *gtid_mode_var= NULL;
  char *version_var= NULL;
  char *version_comment_var= NULL;
  char *innodb_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 *page_zip_level_var= NULL;
  char *ignore_db_dirs= NULL;
  char *endptr;
  unsigned long 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", &gtid_mode_var},
      {"version", &version_var},
      {"version_comment", &version_comment_var},
      {"innodb_version", &innodb_version_var},
      {"wsrep_on", &wsrep_on_var},
      {"slave_parallel_workers", &slave_parallel_workers_var},
      {"gtid_slave_pos", &gtid_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},
      {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 and detect server flavor */

  if (!(ret= check_server_version(server_version, version_var,
                                  version_comment_var, innodb_version_var)))
  {
    goto out;
  }

  if (server_version > 50500)
  {
    have_flush_engine_logs= true;
  }

  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: MySQL 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(innodb_data_file_path_var, MYF(MY_FAE));
  }

  if (innodb_data_home_dir_var)
  {
    innobase_data_home_dir= my_strdup(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(innodb_log_group_home_dir_var, MYF(MY_FAE));
  }

  if (innodb_undo_directory_var && *innodb_undo_directory_var)
  {
    srv_undo_dir= my_strdup(innodb_undo_directory_var, MYF(MY_FAE));
  }

  if (innodb_log_files_in_group_var)
  {
    srv_n_log_files= strtol(innodb_log_files_in_group_var, &endptr, 10);
    ut_ad(*endptr == 0);
  }

  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= strtoul(innodb_undo_tablespaces_var, &endptr, 10);
    ut_ad(*endptr == 0);
  }

  if (page_zip_level_var != NULL)
  {
    page_zip_level= 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);
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out:
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  free_mysql_variables(mysql_vars);
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  return (ret);
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}

/*********************************************************************//**
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);

		/* INNODB_CHANGED_PAGES are listed in
		INFORMATION_SCHEMA.PLUGINS in MariaDB, but
		FLUSH NO_WRITE_TO_BINLOG CHANGED_PAGE_BITMAPS
		is not supported for versions below 10.1.6
		(see MDEV-7472) */
		if (server_flavor == FLAVOR_MARIADB &&
		    mysql_server_version < 100106) {
			have_changed_page_bitmaps = false;
		}

		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 "
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		 	"replication. Ignoring the option.");
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		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 "
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			"multi-threaded slave.");
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		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,
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				(unsigned long)strlen(opt_incremental_history_name));
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		snprintf(query, sizeof(query),
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			"SELECT innodb_to_lsn "
			"FROM PERCONA_SCHEMA.xtrabackup_history "
			"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,
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				(unsigned long)strlen(opt_incremental_history_uuid));
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		snprintf(query, sizeof(query),
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			"SELECT innodb_to_lsn "
			"FROM PERCONA_SCHEMA.xtrabackup_history "
			"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);
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	const MYSQL_ROW row = mysql_fetch_row(mysql_result);
	if (row) {
		*incremental_lsn = strtoull(row[0], NULL, 10);
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		msg("Found and using lsn: " LSN_PF " for %s %s",
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		    *incremental_lsn,
		    opt_incremental_history_uuid ? "uuid" : "name",
		    opt_incremental_history_uuid ?
		    opt_incremental_history_uuid :
		    opt_incremental_history_name);
	} else {
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		msg("Error while attempting to find history record "
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			"for %s %s",
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			opt_incremental_history_uuid ? "uuid" : "name",
			opt_incremental_history_uuid ?
		    		opt_incremental_history_uuid :
		    		opt_incremental_history_name);
	}

	mysql_free_result(mysql_result);

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	return(row != NULL);
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}

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)
{
734 735 736
	MYSQL_RES *result = xb_mysql_query(connection, "SHOW FULL PROCESSLIST",
					   true);
	const bool all_queries = (opt_lock_wait_query_type == QUERY_TYPE_ALL);
737
	bool have_to_wait = false;
738

739
	while (MYSQL_ROW row = mysql_fetch_row(result)) {
740
		const char	*info		= row[7];
741
		int		duration	= row[5] ? atoi(row[5]) : 0;
742 743 744 745 746 747
		char		*id		= row[0];

		if (info != NULL
		    && duration >= (int)threshold
		    && ((all_queries && is_query(info))
		    	|| is_update_query(info))) {
748
			msg("Waiting for query %s (duration %d sec): %s",
749
			       id, duration, info);
750 751
			have_to_wait = true;
			break;
752 753 754
		}
	}

755 756
	mysql_free_result(result);
	return(have_to_wait);
757 758 759 760
}

static
void
761
kill_long_queries(MYSQL *connection, time_t timeout)
762 763 764
{
	char kill_stmt[100];

765 766 767 768
	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)) {
769
		const char	*info		= row[7];
770
		long long		duration	= row[5]? atoll(row[5]) : 0;
771 772 773
		char		*id		= row[0];

		if (info != NULL &&
774
		    (time_t)duration >= timeout &&
775 776
		    ((all_queries && is_query(info)) ||
		    	is_select_query(info))) {
777
			msg("Killing query %s (duration %d sec): %s",
778
			       id, (int)duration, info);
779
			snprintf(kill_stmt, sizeof(kill_stmt),
780 781 782 783
				    "KILL %s", id);
			xb_mysql_query(connection, kill_stmt, false, false);
		}
	}
784 785

	mysql_free_result(result);
786 787 788 789 790 791 792 793 794 795
}

static
bool
wait_for_no_updates(MYSQL *connection, uint timeout, uint threshold)
{
	time_t	start_time;

	start_time = time(NULL);

796 797
	msg("Waiting %u seconds for queries running longer than %u seconds "
	       "to finish", timeout, threshold);
798 799 800 801 802 803 804 805

	while (time(NULL) <= (time_t)(start_time + timeout)) {
		if (!have_queries_to_wait_for(connection, threshold)) {
			return(true);
		}
		os_thread_sleep(1000000);
	}

806
	msg("Unable to obtain lock. Please try again later.");
807 808 809 810 811 812

	return(false);
}

static
os_thread_ret_t
813
DECLARE_THREAD(kill_query_thread)(
814 815 816 817 818 819 820 821 822 823
/*===============*/
	void *arg __attribute__((unused)))
{
	MYSQL	*mysql;
	time_t	start_time;

	start_time = time(NULL);

	os_event_set(kill_query_thread_started);

824
	msg("Kill query timeout %d seconds.",
825 826 827 828 829 830 831 832 833 834 835
	       opt_kill_long_queries_timeout);

	while (time(NULL) - start_time <
				(time_t)opt_kill_long_queries_timeout) {
		if (os_event_wait_time(kill_query_thread_stop, 1000) !=
		    OS_SYNC_TIME_EXCEEDED) {
			goto stop_thread;
		}
	}

	if ((mysql = xb_mysql_connect()) == NULL) {
836
		msg("Error: kill query thread failed");
837 838 839 840 841 842 843 844 845 846 847 848 849 850
		goto stop_thread;
	}

	while (true) {
		kill_long_queries(mysql, time(NULL) - start_time);
		if (os_event_wait_time(kill_query_thread_stop, 1000) !=
		    OS_SYNC_TIME_EXCEEDED) {
			break;
		}
	}

	mysql_close(mysql);

stop_thread:
851
	msg("Kill query thread stopped");
852 853 854

	os_event_set(kill_query_thread_stopped);

855
	os_thread_exit();
856 857 858 859 860 861 862 863
	OS_THREAD_DUMMY_RETURN;
}


static
void
start_query_killer()
{
864 865 866
	kill_query_thread_stop		= os_event_create(0);
	kill_query_thread_started	= os_event_create(0);
	kill_query_thread_stopped	= os_event_create(0);
867 868 869 870 871 872 873 874 875 876 877 878 879 880

	os_thread_create(kill_query_thread, NULL, &kill_query_thread_id);

	os_event_wait(kill_query_thread_started);
}

static
void
stop_query_killer()
{
	os_event_set(kill_query_thread_stop);
	os_event_wait_time(kill_query_thread_stopped, 60000);
}

881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900

/*
Killing connections that wait for MDL lock.
If lock-ddl-per-table is used, there can be some DDL statements

FLUSH TABLES would hang infinitely, if DDL statements are waiting for
MDL lock, which mariabackup currently holds. Therefore we start killing
those  statements from a dedicated thread, until FLUSH TABLES WITH READ LOCK
succeeds.
*/

static os_event_t mdl_killer_stop_event;
static os_event_t mdl_killer_finished_event;

static
os_thread_ret_t
DECLARE_THREAD(kill_mdl_waiters_thread(void *))
{
	MYSQL	*mysql;
	if ((mysql = xb_mysql_connect()) == NULL) {
901
		msg("Error: kill mdl waiters thread failed to connect");
902 903 904 905 906 907 908 909
		goto stop_thread;
	}

	for(;;){
		if (os_event_wait_time(mdl_killer_stop_event, 1000) == 0)
			break;

		MYSQL_RES *result = xb_mysql_query(mysql,
910
			"SELECT ID, COMMAND, INFO FROM INFORMATION_SCHEMA.PROCESSLIST "
911 912 913 914 915
			" WHERE State='Waiting for table metadata lock'",
			true, true);
		while (MYSQL_ROW row = mysql_fetch_row(result))
		{
			char query[64];
916 917 918 919

			if (row[1] && !strcmp(row[1], "Killed"))
				continue;

920
			msg("Killing MDL waiting %s ('%s') on connection %s",
921
				row[1], row[2], row[0]);
922
			snprintf(query, sizeof(query), "KILL QUERY %s", row[0]);
923
			if (mysql_query(mysql, query) && (mysql_errno(mysql) != ER_NO_SUCH_THREAD)) {
924
				die("failed to execute query %s: %s", query,mysql_error(mysql));
925
			}
926
		}
927
		mysql_free_result(result);
928 929 930 931 932
	}

	mysql_close(mysql);

stop_thread:
933
	msg("Kill mdl waiters thread stopped");
934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957
	os_event_set(mdl_killer_finished_event);
	os_thread_exit();
	return os_thread_ret_t(0);
}


static void start_mdl_waiters_killer()
{
	mdl_killer_stop_event = os_event_create(0);
	mdl_killer_finished_event = os_event_create(0);
	os_thread_create(kill_mdl_waiters_thread, 0, 0);
}


/* Tell MDL killer to stop and finish for its completion*/
static void stop_mdl_waiters_killer()
{
	os_event_set(mdl_killer_stop_event);
	os_event_wait(mdl_killer_finished_event);

	os_event_destroy(mdl_killer_stop_event);
	os_event_destroy(mdl_killer_finished_event);
}

958 959 960 961 962
/*********************************************************************//**
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 */
963
bool lock_tables(MYSQL *connection)
964
{
965 966 967 968 969 970 971 972 973 974
  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);
  }
975

976 977 978 979 980 981
  if (have_backup_locks)
  {
    msg("Executing LOCK TABLES FOR BACKUP...");
    xb_mysql_query(connection, "LOCK TABLES FOR BACKUP", false);
    return (true);
  }
982

983 984 985 986
  if (opt_lock_ddl_per_table)
  {
    start_mdl_waiters_killer();
  }
987

988 989
  if (!opt_lock_wait_timeout && !opt_kill_long_queries_timeout)
  {
990

991 992 993 994 995 996 997
    /* We do first a FLUSH TABLES. If a long update is running, the
    FLUSH TABLES will wait but will not stall the whole mysqld, and
    when the long update is done the FLUSH TABLES WITH READ LOCK
    will start and succeed quickly. So, FLUSH TABLES is to lower
    the probability of a stage where both mysqldump and most client
    connections are stalled. Of course, if a second long update
    starts between the two FLUSHes, we have that bad stall.
998

999 1000 1001
    Option lock_wait_timeout serve the same purpose and is not
    compatible with this trick.
    */
1002

1003
    msg("Executing FLUSH NO_WRITE_TO_BINLOG TABLES...");
1004

1005 1006
    xb_mysql_query(connection, "FLUSH NO_WRITE_TO_BINLOG TABLES", false);
  }
1007

1008 1009 1010 1011 1012 1013 1014 1015
  if (opt_lock_wait_timeout)
  {
    if (!wait_for_no_updates(connection, opt_lock_wait_timeout,
                             opt_lock_wait_threshold))
    {
      return (false);
    }
  }
1016

1017
  msg("Executing FLUSH TABLES WITH READ LOCK...");
1018

1019 1020 1021 1022
  if (opt_kill_long_queries_timeout)
  {
    start_query_killer();
  }
1023

1024 1025 1026 1027
  if (have_galera_enabled)
  {
    xb_mysql_query(connection, "SET SESSION wsrep_causal_reads=0", false);
  }
1028

1029 1030 1031 1032 1033 1034 1035
  xb_mysql_query(connection, "FLUSH TABLES WITH READ LOCK", false, true);
  /* 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);
1036

1037 1038 1039 1040
  if (opt_lock_ddl_per_table)
  {
    stop_mdl_waiters_killer();
  }
1041

1042 1043 1044 1045
  if (opt_kill_long_queries_timeout)
  {
    stop_query_killer();
  }
1046

1047
  return (true);
1048 1049 1050 1051 1052 1053 1054 1055 1056 1057
}

/*********************************************************************//**
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) {
1058
		msg("Executing LOCK BINLOG FOR BACKUP...");
1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076
		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) {
1077
		msg("Debug sleep for %u seconds",
1078 1079 1080 1081 1082
		       opt_debug_sleep_before_unlock);
		os_thread_sleep(opt_debug_sleep_before_unlock * 1000);
	}

	if (binlog_locked) {
1083
		msg("Executing UNLOCK BINLOG");
1084 1085 1086
		xb_mysql_query(connection, "UNLOCK BINLOG", false);
	}

1087
	msg("Executing UNLOCK TABLES");
1088 1089
	xb_mysql_query(connection, "UNLOCK TABLES", false);

1090
	msg("All tables unlocked");
1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140
}


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 "
1141
			"--safe-slave-backup because host is not a slave");
1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154
		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);
1155
	msg("Slave open temp tables: %d", open_temp_tables);
1156 1157

	while (open_temp_tables && n_attempts--) {
1158
		msg("Starting slave SQL thread, waiting %d seconds, then "
1159
		       "checking Slave_open_temp_tables again (%d attempts "
1160
		       "remaining)...", sleep_time, n_attempts);
1161 1162 1163 1164 1165 1166

		xb_mysql_query(connection, "START SLAVE SQL_THREAD", false);
		os_thread_sleep(sleep_time * 1000000);
		xb_mysql_query(connection, "STOP SLAVE SQL_THREAD", false);

		open_temp_tables = get_open_temp_tables(connection);
1167
		msg("Slave open temp tables: %d", open_temp_tables);
1168 1169 1170 1171
	}

	/* Restart the slave if it was running at start */
	if (open_temp_tables == 0) {
1172
		msg("Slave is safe to backup");
1173 1174 1175 1176 1177 1178
		goto cleanup;
	}

	result = false;

	if (sql_thread_started) {
1179
		msg("Restarting slave SQL thread.");
1180 1181 1182
		xb_mysql_query(connection, "START SLAVE SQL_THREAD", false);
	}

1183 1184
	msg("Slave_open_temp_tables did not become zero after "
	       "%d seconds", opt_safe_slave_backup_timeout);
1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202

cleanup:
	free_mysql_variables(status);

	return(result);
}


/*********************************************************************//**
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. */
bool
write_slave_info(MYSQL *connection)
{
	char *master = NULL;
	char *filename = NULL;
	char *gtid_executed = NULL;
1203
	char *using_gtid = NULL;
1204 1205 1206 1207 1208 1209 1210 1211 1212 1213
	char *position = NULL;
	char *gtid_slave_pos = NULL;
	char *ptr;
	bool result = false;

	mysql_variable status[] = {
		{"Master_Host", &master},
		{"Relay_Master_Log_File", &filename},
		{"Exec_Master_Log_Pos", &position},
		{"Executed_Gtid_Set", &gtid_executed},
1214
		{"Using_Gtid", &using_gtid},
1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227
		{NULL, NULL}
	};

	mysql_variable variables[] = {
		{"gtid_slave_pos", &gtid_slave_pos},
		{NULL, NULL}
	};

	read_mysql_variables(connection, "SHOW SLAVE STATUS", status, false);
	read_mysql_variables(connection, "SHOW VARIABLES", variables, true);

	if (master == NULL || filename == NULL || position == NULL) {
		msg("Failed to get master binlog coordinates "
1228 1229
			"from SHOW SLAVE STATUS.This means that the server is not a "
			"replication slave. Ignoring the --slave-info option");
1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254
		/* we still want to continue the backup */
		result = true;
		goto cleanup;
	}

	/* Print slave status to a file.
	If GTID mode is used, construct a CHANGE MASTER statement with
	MASTER_AUTO_POSITION and correct a gtid_purged value. */
	if (gtid_executed != NULL && *gtid_executed) {
		/* MySQL >= 5.6 with GTID enabled */

		for (ptr = strchr(gtid_executed, '\n');
		     ptr;
		     ptr = strchr(ptr, '\n')) {
			*ptr = ' ';
		}

		result = backup_file_printf(XTRABACKUP_SLAVE_INFO,
			"SET GLOBAL gtid_purged='%s';\n"
			"CHANGE MASTER TO MASTER_AUTO_POSITION=1\n",
			gtid_executed);

		ut_a(asprintf(&mysql_slave_position,
			"master host '%s', purge list '%s'",
			master, gtid_executed) != -1);
1255 1256
	} else if (gtid_slave_pos && *gtid_slave_pos &&
			!(using_gtid && !strncmp(using_gtid, "No", 2))) {
1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312
		/* MariaDB >= 10.0 with GTID enabled */
		result = backup_file_printf(XTRABACKUP_SLAVE_INFO,
			"SET GLOBAL gtid_slave_pos = '%s';\n"
			"CHANGE MASTER TO master_use_gtid = slave_pos\n",
			gtid_slave_pos);
		ut_a(asprintf(&mysql_slave_position,
			"master host '%s', gtid_slave_pos %s",
			master, gtid_slave_pos) != -1);
	} else {
		result = backup_file_printf(XTRABACKUP_SLAVE_INFO,
			"CHANGE MASTER TO MASTER_LOG_FILE='%s', "
			"MASTER_LOG_POS=%s\n", filename, position);
		ut_a(asprintf(&mysql_slave_position,
			"master host '%s', filename '%s', position '%s'",
			master, filename, position) != -1);
	}

cleanup:
	free_mysql_variables(status);
	free_mysql_variables(variables);

	return(result);
}


/*********************************************************************//**
Retrieves MySQL Galera and
saves it in a file. It also prints it to stdout. */
bool
write_galera_info(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)) {
1313
		msg("Failed to get master wsrep state from SHOW STATUS.");
1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400
		result = false;
		goto cleanup;
	}

	result = backup_file_printf(XTRABACKUP_GALERA_INFO,
		"%s:%s\n", state_uuid ? state_uuid : state_uuid55,
			last_committed ? last_committed : last_committed55);

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(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", &gtid_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;
		}

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		snprintf(filepath, sizeof(filepath), "%s%c%s",
			 log_bin_dir, FN_LIBCHAR, log_bin_file);
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		result = copy_file(ds_data, 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(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", &gtid_executed},
		{NULL, NULL}
	};

	mysql_variable vars[] = {
		{"gtid_mode", &gtid_mode},
		{"gtid_current_pos", &gtid_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 = 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 = backup_file_printf(XTRABACKUP_BINLOG_INFO,
					    "%s\t%s\n", filename, position);
	}

cleanup:
	free_mysql_variables(status);
	free_mysql_variables(vars);

	return(result);
}

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struct escape_and_quote
1483
{
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	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);
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	len = mysql_real_escape_string(eq.mysql, escaped, eq.str, (ulong)len);
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	s << std::string(escaped, len);
	s << '\'';
	return s;
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}
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/*********************************************************************//**
Writes xtrabackup_info file and if backup_history is enable creates
PERCONA_SCHEMA.xtrabackup_history and writes a new history record to the
table containing all the history info particular to the just completed
backup. */
bool
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write_xtrabackup_info(MYSQL *connection, const char * filename, bool history,
                       bool stream)
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{
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	bool result = true;
	FILE *fp = NULL;
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	char *uuid = NULL;
	char *server_version = NULL;
	char buf_start_time[100];
	char buf_end_time[100];
	tm tm;
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	std::ostringstream oss;
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	const char *xb_stream_name[] = {"file", "tar", "xbstream"};
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	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);
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	bool is_partial = (xtrabackup_tables
		|| xtrabackup_tables_file
		|| xtrabackup_databases
Vladislav Vaintroub's avatar
Vladislav Vaintroub committed
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		|| xtrabackup_databases_file
		|| xtrabackup_tables_exclude
		|| xtrabackup_databases_exclude
		);
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	char *buf = NULL;
	int buf_len = asprintf(&buf,
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		"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"
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		"innodb_from_lsn = " LSN_PF "\n"
		"innodb_to_lsn = " LSN_PF "\n"
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		"partial = %s\n"
		"incremental = %s\n"
		"format = %s\n"
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		"compressed = %s\n",
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		uuid, /* uuid */
		opt_history ? opt_history : "",  /* name */
		tool_name,  /* tool_name */
		tool_args,  /* tool_command */
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		MYSQL_SERVER_VERSION,  /* tool_version */
		MYSQL_SERVER_VERSION,  /* ibbackup_version */
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		server_version,  /* server_version */
		buf_start_time,  /* start_time */
		buf_end_time,  /* end_time */
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		(int)history_lock_time, /* lock_time */
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		mysql_binlog_position ?
			mysql_binlog_position : "", /* binlog_pos */
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		incremental_lsn,
		/* innodb_from_lsn */
		metadata_to_lsn,
		/* innodb_to_lsn */
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		is_partial? "Y" : "N",
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		xtrabackup_incremental ? "Y" : "N", /* incremental */
		xb_stream_name[xtrabackup_stream_fmt], /* format */
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		xtrabackup_compress ? "compressed" : "N"); /* compressed */
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	if (buf_len < 0) {
		msg("Error: cannot generate xtrabackup_info");
		result = false;
		goto cleanup;
	}

	if (stream) {
		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;
		}
	}
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	if (!history) {
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		goto cleanup;
	}

	xb_mysql_query(connection,
		"CREATE DATABASE IF NOT EXISTS PERCONA_SCHEMA", false);
	xb_mysql_query(connection,
		"CREATE TABLE IF NOT EXISTS PERCONA_SCHEMA.xtrabackup_history("
		"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,"
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		"compressed ENUM('Y', 'N') DEFAULT NULL"
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		") CHARACTER SET utf8 ENGINE=innodb", false);

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#define ESCAPE_BOOL(expr) ((expr)?"'Y'":"'N'")

	oss << "insert into PERCONA_SCHEMA.xtrabackup_history("
		<< "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,"
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		<< "partial, incremental, format, compressed) "
		<< "values("
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		<< 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]) <<","
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		<< ESCAPE_BOOL(xtrabackup_compress) << ")";
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	xb_mysql_query(mysql_connection, oss.str().c_str(), false);
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cleanup:

	free(uuid);
	free(server_version);
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	free(buf);
	if (fp)
		fclose(fp);
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	return(result);
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}

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extern const char *innodb_checksum_algorithm_names[];

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#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();
}

1709
bool write_backup_config_file()
1710
{
1711
	int rc= backup_file_printf("backup-my.cnf",
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		"# This MySQL options file was generated by innobackupex.\n\n"
		"# The MySQL server\n"
		"[mysqld]\n"
		"innodb_checksum_algorithm=%s\n"
		"innodb_data_file_path=%s\n"
		"innodb_log_files_in_group=%lu\n"
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		"innodb_log_file_size=%llu\n"
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		"innodb_page_size=%lu\n"
		"innodb_undo_directory=%s\n"
		"innodb_undo_tablespaces=%lu\n"
1722
		"innodb_compression_level=%u\n"
1723
		"%s%s\n"
1724
		"%s\n",
1725
		innodb_checksum_algorithm_names[srv_checksum_algorithm],
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		make_local_paths(innobase_data_file_path).c_str(),
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		srv_n_log_files,
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		srv_log_file_size,
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		srv_page_size,
		srv_undo_dir,
		srv_undo_tablespaces,
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		page_zip_level,
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		innobase_buffer_pool_filename ?
			"innodb_buffer_pool_filename=" : "",
		innobase_buffer_pool_filename ?
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			innobase_buffer_pool_filename : "",
		encryption_plugin_get_config());
		return rc;
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}


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=...";
		}
1756 1757
		left-= snprintf(buf + len - left, left,
				"%s%c", arg, argc > 1 ? ' ' : 0);
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		++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 MySQL 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);
	}
}
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static MYSQL *mdl_con = NULL;

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std::map<ulint, std::string> spaceid_to_tablename;

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void
mdl_lock_init()
{
  mdl_con = xb_mysql_connect();
1823
  if (!mdl_con)
1824
  {
1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835
    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]);
1836
  }
1837 1838 1839
  mysql_free_result(mysql_result);

  xb_mysql_query(mdl_con, "BEGIN", false, true);
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}

void
mdl_lock_table(ulint space_id)
{
1845 1846
  if (space_id == 0)
    return;
1847

1848
  std::string full_table_name = spaceid_to_tablename[space_id];
1849

1850 1851 1852 1853
  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);
  );
1854

1855 1856
  std::ostringstream lock_query;
  lock_query << "SELECT 1 FROM " << full_table_name  << " LIMIT 0";
1857
  msg("Locking MDL for %s", full_table_name.c_str());
1858
  if (mysql_query(mdl_con, lock_query.str().c_str())) {
1859
      msg("Warning : locking MDL failed for space id %zu, name %s", space_id, full_table_name.c_str());
1860
  } else {
1861 1862
      MYSQL_RES *r = mysql_store_result(mdl_con);
      mysql_free_result(r);
1863 1864 1865 1866 1867 1868
  }
}

void
mdl_unlock_all()
{
1869
  msg("Unlocking MDL for all tables");
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  xb_mysql_query(mdl_con, "COMMIT", false, true);
  mysql_close(mdl_con);
1872
  spaceid_to_tablename.clear();
1873
}