76 lines
1.9 KiB
Go
76 lines
1.9 KiB
Go
package db
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import (
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"errors"
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"fmt"
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"io/fs"
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"kooltap-updateserver/internal/models"
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"log"
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"os"
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"github.com/glebarez/sqlite"
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"gorm.io/gorm"
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"gorm.io/gorm/logger"
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)
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// ImportSQLite copies releases from the old SQLite database at path into db,
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// once. It does nothing when the file does not exist. After a successful
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// import the file is renamed to path+".imported" so it is not imported again.
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func ImportSQLite(db *gorm.DB, path string) error {
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if path == "" {
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return nil
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}
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if _, err := os.Stat(path); errors.Is(err, fs.ErrNotExist) {
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return nil
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} else if err != nil {
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return err
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}
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var existing int64
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if err := db.Model(&models.Release{}).Count(&existing).Error; err != nil {
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return err
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}
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if existing > 0 {
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log.Printf("skipping SQLite import from %s: database already has %d releases", path, existing)
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return nil
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}
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src, err := gorm.Open(sqlite.Open(path), &gorm.Config{Logger: logger.Discard})
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if err != nil {
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return fmt.Errorf("open sqlite %s: %w", path, err)
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}
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var releases []models.Release
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err = src.Order("id").Find(&releases).Error
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// Close before renaming the file below
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if sqlDB, cerr := src.DB(); cerr == nil {
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sqlDB.Close()
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}
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if err != nil {
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return fmt.Errorf("read sqlite releases: %w", err)
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}
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err = db.Transaction(func(tx *gorm.DB) error {
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if len(releases) > 0 {
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if err := tx.Create(&releases).Error; err != nil {
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return err
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}
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}
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// Rows were inserted with their original IDs, so move the sequence past them
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if tx.Dialector.Name() == "postgres" {
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return tx.Exec(`SELECT setval(pg_get_serial_sequence('releases', 'id'), COALESCE((SELECT MAX(id) FROM releases), 0) + 1, false)`).Error
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}
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return nil
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})
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if err != nil {
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return fmt.Errorf("import releases: %w", err)
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}
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if err := os.Rename(path, path+".imported"); err != nil {
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log.Printf("imported SQLite database but could not rename it: %v", err)
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}
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log.Printf("imported %d releases from %s", len(releases), path)
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return nil
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}
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