firehol/netdata

// SPDX-License-Identifier: GPL-3.0-or-later

package mysql

import (
    "fmt"
    "regexp"
    "strings"

    "github.com/blang/semver/v4"
)

const queryShowVersion = `
SHOW GLOBAL VARIABLES 
WHERE 
  Variable_name LIKE 'version'
  OR Variable_name LIKE 'version_comment';`

var reVersionCore = regexp.MustCompile(`^\d+\.\d+\.\d+`)

func (m *MySQL) collectVersion() error {
    // https://mariadb.com/kb/en/version/
    q := queryShowVersion
    m.Debugf("executing query: '%s'", queryShowVersion)

    var name, version, versionComment string
    _, err := m.collectQuery(q, func(column, value string, _ bool) {
        switch column {
        case "Variable_name":
            name = value
        case "Value":
            switch name {
            case "version":
                version = value
            case "version_comment":
                versionComment = value
            }
        }
    })
    if err != nil {
        return err
    }

    m.Infof("application version: '%s', version_comment: '%s'", version, versionComment)

    // version string is not always valid semver (ex.: 8.0.22-0ubuntu0.20.04.2)
    s := reVersionCore.FindString(version)
    if s == "" {
        return fmt.Errorf("couldn't parse version string '%s'", version)
    }

    ver, err := semver.New(s)
    if err != nil {
        return fmt.Errorf("couldn't parse version string '%s': %v", s, err)
    }

    m.version = ver
    m.isMariaDB = strings.Contains(version, "MariaDB") || strings.Contains(versionComment, "mariadb")
    m.isPercona = strings.Contains(versionComment, "Percona")

    return nil
}