117 lines
3.6 KiB
Go
117 lines
3.6 KiB
Go
// Copyright or © or Copr. happyDNS (2020)
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//
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// contact@happydomain.org
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//
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// This software is a computer program whose purpose is to provide a modern
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// interface to interact with DNS systems.
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//
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// This software is governed by the CeCILL license under French law and abiding
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// by the rules of distribution of free software. You can use, modify and/or
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// redistribute the software under the terms of the CeCILL license as
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// circulated by CEA, CNRS and INRIA at the following URL
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// "http://www.cecill.info".
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//
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// As a counterpart to the access to the source code and rights to copy, modify
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// and redistribute granted by the license, users are provided only with a
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// limited warranty and the software's author, the holder of the economic
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// rights, and the successive licensors have only limited liability.
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//
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// In this respect, the user's attention is drawn to the risks associated with
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// loading, using, modifying and/or developing or reproducing the software by
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// the user in light of its specific status of free software, that may mean
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// that it is complicated to manipulate, and that also therefore means that it
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// is reserved for developers and experienced professionals having in-depth
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// computer knowledge. Users are therefore encouraged to load and test the
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// software's suitability as regards their requirements in conditions enabling
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// the security of their systems and/or data to be ensured and, more generally,
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// to use and operate it in the same conditions as regards security.
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//
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// The fact that you are presently reading this means that you have had
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// knowledge of the CeCILL license and that you accept its terms.
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package database // import "happydns.org/database"
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import (
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"database/sql"
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"log"
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"strings"
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"time"
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_ "github.com/go-sql-driver/mysql"
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)
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type MySQLStorage struct {
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db *sql.DB
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}
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// NewMySQLStorage establishes the connection to the database
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func NewMySQLStorage(dsn string) (*MySQLStorage, error) {
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if db, err := sql.Open("mysql", dsn+"?parseTime=true&foreign_key_checks=1"); err != nil {
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return nil, err
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} else {
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_, err := db.Exec(`SET SESSION sql_mode = 'STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO';`)
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for i := 0; err != nil && i < 45; i += 1 {
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if _, err = db.Exec(`SET SESSION sql_mode = 'STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO';`); err != nil && i <= 45 {
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log.Println("An error occurs when trying to connect to DB, will retry in 2 seconds: ", err)
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time.Sleep(2 * time.Second)
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}
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}
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if err != nil {
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return nil, err
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}
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return &MySQLStorage{db}, nil
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}
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}
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func (s *MySQLStorage) DoMigration() error {
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var currentVersion uint16
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s.db.QueryRow(`SELECT version FROM schema_version`).Scan(¤tVersion)
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log.Println("Current schema version:", currentVersion)
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log.Println("Latest schema version:", schemaVersion)
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for version := currentVersion + 1; version <= schemaVersion; version++ {
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log.Println("Migrating to version:", version)
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tx, err := s.db.Begin()
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if err != nil {
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return err
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}
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rawSQL := schemaRevisions[version]
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for _, request := range strings.Split(rawSQL, ";") {
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if len(strings.TrimSpace(request)) == 0 {
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continue
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}
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_, err = tx.Exec(request)
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if err != nil {
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tx.Rollback()
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return err
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}
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}
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if _, err := tx.Exec(`delete from schema_version`); err != nil {
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tx.Rollback()
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return err
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}
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if _, err := tx.Exec(`INSERT INTO schema_version (version) VALUES (?)`, version); err != nil {
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tx.Rollback()
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return err
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}
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if err := tx.Commit(); err != nil {
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tx.Rollback()
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return err
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}
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}
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return nil
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}
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func (s *MySQLStorage) Close() error {
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return s.db.Close()
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}
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