| 1 | // SPDX-License-Identifier: GPL-3.0-or-later |
| 2 | |
| 3 | package mysql |
| 4 | |
| 5 | import "context" |
| 6 | |
| 7 | const ( |
| 8 | queryShowGlobalVariables = ` |
| 9 | SHOW GLOBAL VARIABLES |
| 10 | WHERE |
| 11 | Variable_name LIKE 'max_connections' |
| 12 | OR Variable_name LIKE 'table_open_cache' |
| 13 | OR Variable_name LIKE 'disabled_storage_engines' |
| 14 | OR Variable_name LIKE 'log_bin' |
| 15 | OR Variable_name LIKE 'innodb_log_file_size' |
| 16 | OR Variable_name LIKE 'innodb_log_files_in_group' |
| 17 | OR Variable_name LIKE 'performance_schema';` |
| 18 | ) |
| 19 | |
| 20 | func (c *Collector) collectGlobalVariables(ctx context.Context) error { |
| 21 | // MariaDB: https://mariadb.com/kb/en/server-system-variables/ |
| 22 | // MySQL: https://dev.mysql.com/doc/refman/8.0/en/server-system-variable-reference.html |
| 23 | q := queryShowGlobalVariables |
| 24 | c.Debugf("executing query: '%s'", q) |
| 25 | |
| 26 | var name string |
| 27 | _, err := c.collectQuery(ctx, q, func(column, value string, _ bool) { |
| 28 | switch column { |
| 29 | case "Variable_name": |
| 30 | name = value |
| 31 | case "Value": |
| 32 | switch name { |
| 33 | case "disabled_storage_engines": |
| 34 | c.varDisabledStorageEngine = value |
| 35 | case "innodb_log_file_size": |
| 36 | c.varInnoDBLogFileSize = parseInt(value) |
| 37 | case "innodb_log_files_in_group": |
| 38 | c.varInnoDBLogFilesInGroup = parseInt(value) |
| 39 | case "log_bin": |
| 40 | c.varLogBin = value |
| 41 | case "max_connections": |
| 42 | c.varMaxConns = parseInt(value) |
| 43 | case "performance_schema": |
| 44 | c.varPerformanceSchema = value |
| 45 | case "table_open_cache": |
| 46 | c.varTableOpenCache = parseInt(value) |
| 47 | } |
| 48 | } |
| 49 | }) |
| 50 | return err |
| 51 | } |