115 lines
2.4 KiB
Go
115 lines
2.4 KiB
Go
package db
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import (
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"context"
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"embed"
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"fmt"
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"io/fs"
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"log/slog"
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"sort"
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"strconv"
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"strings"
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"time"
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)
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//go:embed migrations/*.sql
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var migrationsFS embed.FS
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type migration struct {
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version int
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name string
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sql string
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}
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func (d *DB) Migrate(ctx context.Context) error {
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if _, err := d.ExecContext(ctx, `CREATE TABLE IF NOT EXISTS schema_migrations (
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version INTEGER PRIMARY KEY,
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applied_at TEXT NOT NULL
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)`); err != nil {
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return fmt.Errorf("ensure schema_migrations: %w", err)
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}
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migs, err := loadMigrations()
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if err != nil {
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return err
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}
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applied, err := d.appliedVersions(ctx)
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if err != nil {
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return err
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}
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for _, m := range migs {
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if applied[m.version] {
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continue
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}
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slog.Info("applying migration", "version", m.version, "name", m.name)
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if err := d.applyOne(ctx, m); err != nil {
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return fmt.Errorf("apply %d %s: %w", m.version, m.name, err)
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}
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}
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return nil
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}
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func (d *DB) applyOne(ctx context.Context, m migration) error {
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tx, err := d.BeginTx(ctx, nil)
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if err != nil {
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return err
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}
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defer tx.Rollback()
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if _, err := tx.ExecContext(ctx, m.sql); err != nil {
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return err
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}
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if _, err := tx.ExecContext(ctx,
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`INSERT INTO schema_migrations(version, applied_at) VALUES(?, ?)`,
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m.version, time.Now().UTC().Format(time.RFC3339)); err != nil {
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return err
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}
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return tx.Commit()
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}
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func (d *DB) appliedVersions(ctx context.Context) (map[int]bool, error) {
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rows, err := d.QueryContext(ctx, `SELECT version FROM schema_migrations`)
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if err != nil {
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return nil, err
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}
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defer rows.Close()
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out := map[int]bool{}
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for rows.Next() {
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var v int
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if err := rows.Scan(&v); err != nil {
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return nil, err
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}
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out[v] = true
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}
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return out, rows.Err()
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}
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func loadMigrations() ([]migration, error) {
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entries, err := fs.ReadDir(migrationsFS, "migrations")
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if err != nil {
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return nil, fmt.Errorf("read migrations: %w", err)
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}
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out := make([]migration, 0, len(entries))
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for _, e := range entries {
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if e.IsDir() || !strings.HasSuffix(e.Name(), ".sql") {
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continue
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}
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parts := strings.SplitN(e.Name(), "_", 2)
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if len(parts) != 2 {
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continue
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}
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v, err := strconv.Atoi(parts[0])
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if err != nil {
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continue
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}
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b, err := migrationsFS.ReadFile("migrations/" + e.Name())
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if err != nil {
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return nil, err
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}
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out = append(out, migration{version: v, name: e.Name(), sql: string(b)})
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}
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sort.Slice(out, func(i, j int) bool { return out[i].version < out[j].version })
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return out, nil
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}
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