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187 lines
6.2 KiB
187 lines
6.2 KiB
5 months ago
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/* Copyright (c) 2016, 2018, Oracle and/or its affiliates. All rights reserved.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License, version 2.0,
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as published by the Free Software Foundation.
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This program is also distributed with certain software (including
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but not limited to OpenSSL) that is licensed under separate terms,
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as designated in a particular file or component or in included license
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documentation. The authors of MySQL hereby grant you an additional
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permission to link the program and your derivative works with the
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separately licensed software that they have included with MySQL.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License, version 2.0, for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
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#ifndef PERSISTED_VARIABLE_H_INCLUDED
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#define PERSISTED_VARIABLE_H_INCLUDED
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#include <stddef.h>
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#include <map>
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#include <string>
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#include <vector>
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#include "my_alloc.h"
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#include "my_inttypes.h"
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#include "my_psi_config.h"
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#include "mysql/components/services/mysql_mutex_bits.h"
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#include "mysql/psi/mysql_mutex.h"
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#include "mysql/psi/psi_base.h"
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#include "sql_string.h"
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class Json_dom;
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class THD;
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class set_var;
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class sys_var;
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struct MYSQL_FILE;
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/**
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STRUCT st_persist_var
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This structure represents information of a variable which is to
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be persisted in mysql-auto.cnf file.
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*/
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struct st_persist_var {
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std::string key;
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std::string value;
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ulonglong timestamp;
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std::string user;
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std::string host;
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bool is_null;
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st_persist_var();
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st_persist_var(THD *thd);
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st_persist_var(const std::string key, const std::string value,
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const ulonglong timestamp, const std::string user,
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const std::string host, const bool is_null);
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};
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/**
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CLASS Persisted_variables_cache
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Holds <name,value> pair of all options which needs to be persisted
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to a file.
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OVERVIEW
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--------
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When first SET PERSIST statement is executed we instantiate
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Persisted_variables_cache which loads the config file if present into
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m_persist_variables vector. This is a singleton operation. m_persist_variables
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is an in-memory copy of config file itself. If the SET statement passes then
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this in-memory is updated and flushed to file as an atomic operation.
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Next SET PERSIST statement would only update the in-memory copy and sync
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to config file instead of loading the file again.
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*/
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#ifdef HAVE_PSI_INTERFACE
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void my_init_persist_psi_keys(void);
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#endif /* HAVE_PSI_INTERFACE */
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class Persisted_variables_cache {
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public:
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int init(int *argc, char ***argv);
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static Persisted_variables_cache *get_instance();
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/**
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Update in-memory copy for every SET PERSIST statement
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*/
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void set_variable(THD *thd, set_var *system_var);
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/**
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Flush in-memory copy to persistent file
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*/
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bool flush_to_file();
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/**
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Read options from persistent file
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*/
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int read_persist_file();
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/**
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Search for persisted config file and if found read persistent options
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*/
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bool load_persist_file();
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/**
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Set persisted options
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*/
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bool set_persist_options(bool plugin_options = false);
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/**
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Reset persisted options
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*/
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bool reset_persisted_variables(THD *thd, const char *name, bool if_exists);
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/**
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Get persisted variables
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*/
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std::vector<st_persist_var> *get_persisted_variables();
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/**
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Get persisted static variables
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*/
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std::map<std::string, st_persist_var> *get_persist_ro_variables();
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/**
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append read only persisted variables to command line options with a
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separator.
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*/
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bool append_read_only_variables(int *argc, char ***argv,
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bool plugin_options = false);
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void cleanup();
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/**
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Acquire lock on m_persist_variables/m_persist_ro_variables
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*/
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void lock() { mysql_mutex_lock(&m_LOCK_persist_variables); }
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/**
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Release lock on m_persist_variables/m_persist_ro_variables
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*/
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void unlock() { mysql_mutex_unlock(&m_LOCK_persist_variables); }
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/**
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Assert caller that owns lock on m_persist_variables/m_persist_ro_variables
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*/
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void assert_lock_owner() {
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mysql_mutex_assert_owner(&m_LOCK_persist_variables);
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}
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private:
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/* Helper function to get variable value */
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static String *get_variable_value(THD *thd, sys_var *system_var, String *str,
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bool *is_null);
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/* Helper function to get variable name */
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static const char *get_variable_name(sys_var *system_var);
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/* Helper function to construct json formatted string */
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static String *construct_json_string(std::string name, std::string value,
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ulonglong timestamp, std::string user,
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std::string host, bool is_null,
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String *dest);
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/* Helper function to extract variables from json formatted string */
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bool extract_variables_from_json(const Json_dom *dom,
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bool is_read_only = false);
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private:
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/* Helper functions for file IO */
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bool open_persist_file(int flag);
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void close_persist_file();
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private:
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/* In memory copy of persistent config file */
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std::vector<st_persist_var> m_persist_variables;
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/* copy of plugin variables whose plugin is not yet installed */
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std::vector<st_persist_var> m_persist_plugin_variables;
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/* In memory copy of read only persistent variables */
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std::map<std::string, st_persist_var> m_persist_ro_variables;
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mysql_mutex_t m_LOCK_persist_variables;
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static Persisted_variables_cache *m_instance;
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/* File handler members */
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MYSQL_FILE *m_fd;
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std::string m_persist_filename;
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mysql_mutex_t m_LOCK_persist_file;
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/* Memory for read only persisted options */
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MEM_ROOT ro_persisted_argv_alloc{PSI_NOT_INSTRUMENTED, 512};
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/* Memory for read only persisted plugin options */
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MEM_ROOT ro_persisted_plugin_argv_alloc{PSI_NOT_INSTRUMENTED, 512};
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};
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#endif /* PERSISTED_VARIABLE_H_INCLUDED */
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