91 lines
2.8 KiB
Go
91 lines
2.8 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
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import (
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"fmt"
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"log"
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)
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type LevelDBMigrationFunc func(s *LevelDBStorage) error
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var migrations []LevelDBMigrationFunc = []LevelDBMigrationFunc{
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migrateFrom0,
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migrateFrom1,
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migrateFrom2,
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migrateFrom3,
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}
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func (s *LevelDBStorage) DoMigration() (err error) {
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found := false
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found, err = s.db.Has([]byte("version"), nil)
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if err != nil {
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return
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}
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var version int
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if !found {
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version = len(migrations)
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err = s.put("version", version)
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if err != nil {
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return
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}
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}
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err = s.get("version", &version)
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if err != nil {
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return
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}
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if version > len(migrations) {
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return fmt.Errorf("Your database has revision %d, which is newer than the revision this happyDomain version can handle (max DB revision %d). Please update happyDomain", version, len(migrations))
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}
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for v, migration := range migrations[version:] {
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log.Printf("Doing migration from %d to %d", version+v, version+v+1)
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// Do the migration
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if err = migration(s); err != nil {
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return
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}
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// Save the step
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if err = s.put("version", version+v+1); err != nil {
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return
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}
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log.Printf("Migration from %d to %d DONE!", version+v, version+v+1)
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}
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return nil
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}
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