mirror of https://git.sr.ht/~ashkeel/strimertul
72 lines
1.5 KiB
Go
72 lines
1.5 KiB
Go
package migrations
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import (
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"bytes"
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"errors"
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"fmt"
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"log/slog"
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"strconv"
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"git.sr.ht/~ashkeel/strimertul/database"
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)
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const (
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SchemaKey = "strimertul/schema-version"
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SchemaVersion = 4
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)
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// GetCurrentSchemaVersion returns the current schema version
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// from the database, or 0 if it's not set (v3.x.x or earlier)
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func GetCurrentSchemaVersion(db database.Database) (int, error) {
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versionStr, err := db.GetKey(SchemaKey)
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if err != nil {
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if errors.Is(err, database.ErrEmptyKey) {
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return 0, nil
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}
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}
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if versionStr == "" {
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return 0, nil
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}
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return strconv.Atoi(versionStr)
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}
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func Run(driver database.Driver, db database.Database, logger *slog.Logger) (err error) {
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// Make a backup of the database
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var buffer bytes.Buffer
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if err = driver.Backup(&buffer); err != nil {
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return fmt.Errorf("failed to backup database: %w", err)
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}
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// Restore the backup if an error occurs
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defer func() {
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if err != nil {
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restoreErr := driver.Restore(bytes.NewReader(buffer.Bytes()))
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if restoreErr != nil {
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logger.Error("Failed to restore database from backup", "error", restoreErr)
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}
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}
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}()
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// Get the current schema version
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var currentVersion int
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currentVersion, err = GetCurrentSchemaVersion(db)
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if err != nil {
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return
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}
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// Migrate from v3.x.x to v4.0.0
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if currentVersion < 4 {
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if err = migrateToV4(db, logger); err != nil {
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return
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}
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}
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// Set the new schema version
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if err = db.PutKey(SchemaKey, strconv.Itoa(SchemaVersion)); err != nil {
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return
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}
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return
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}
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