subscription.go
| 1 | package service |
| 2 | |
| 3 | import ( |
| 4 | "fmt" |
| 5 | "log/slog" |
| 6 | "os" |
| 7 | "path/filepath" |
| 8 | "time" |
| 9 | |
| 10 | "github.com/robfig/cron/v3" |
| 11 | |
| 12 | "vidarchive/internal/config" |
| 13 | "vidarchive/internal/models" |
| 14 | "vidarchive/internal/repository" |
| 15 | ) |
| 16 | |
| 17 | // SubscriptionService adds schedule resolution and archive-file ownership on top |
| 18 | // of subscription storage. The repository is embedded rather than wrapped in |
| 19 | // forwarding methods; Delete below deliberately shadows the repository's. |
| 20 | type SubscriptionService struct { |
| 21 | *repository.SubscriptionRepository |
| 22 | cfg *config.Config |
| 23 | } |
| 24 | |
| 25 | func NewSubscriptionService(repo *repository.SubscriptionRepository, cfg *config.Config) *SubscriptionService { |
| 26 | return &SubscriptionService{SubscriptionRepository: repo, cfg: cfg} |
| 27 | } |
| 28 | |
| 29 | // cronForKind maps a schedule kind to a standard 5-field cron expression. Preset |
| 30 | // kinds use canonical expressions; "cron" passes the user's custom expression |
| 31 | // through. Preset times default to 03:00 local to avoid the top-of-hour rush. |
| 32 | func cronForKind(kind, custom string) (string, error) { |
| 33 | switch kind { |
| 34 | case "hourly": |
| 35 | return "0 * * * *", nil |
| 36 | case "daily": |
| 37 | return "0 3 * * *", nil |
| 38 | case "weekly": |
| 39 | return "0 3 * * 0", nil |
| 40 | case "monthly": |
| 41 | return "0 3 1 * *", nil |
| 42 | case "cron": |
| 43 | if custom == "" { |
| 44 | return "", fmt.Errorf("custom schedule requires a cron expression") |
| 45 | } |
| 46 | return custom, nil |
| 47 | default: |
| 48 | return "", fmt.Errorf("unknown schedule kind %q", kind) |
| 49 | } |
| 50 | } |
| 51 | |
| 52 | // CronExprFor resolves and validates the effective cron expression for a kind + |
| 53 | // custom expression, returning an error for unknown kinds or unparseable cron. |
| 54 | func (s *SubscriptionService) CronExprFor(kind, custom string) (string, error) { |
| 55 | expr, err := cronForKind(kind, custom) |
| 56 | if err != nil { |
| 57 | return "", err |
| 58 | } |
| 59 | if _, err := cron.ParseStandard(expr); err != nil { |
| 60 | return "", fmt.Errorf("invalid cron expression %q: %w", expr, err) |
| 61 | } |
| 62 | return expr, nil |
| 63 | } |
| 64 | |
| 65 | // ComputeNextRun returns the next scheduled run time strictly after `from`. |
| 66 | func (s *SubscriptionService) ComputeNextRun(sub *models.Subscription, from time.Time) (time.Time, error) { |
| 67 | expr, err := s.CronExprFor(sub.ScheduleKind, sub.CronExpr) |
| 68 | if err != nil { |
| 69 | return time.Time{}, err |
| 70 | } |
| 71 | sched, err := cron.ParseStandard(expr) |
| 72 | if err != nil { |
| 73 | return time.Time{}, err |
| 74 | } |
| 75 | return sched.Next(from), nil |
| 76 | } |
| 77 | |
| 78 | // ArchivePath is the per-subscription yt-dlp download-archive file used by |
| 79 | // "skip" refresh mode to avoid re-downloading already-fetched entries. |
| 80 | func (s *SubscriptionService) ArchivePath(id int64) string { |
| 81 | return filepath.Join(s.cfg.DataDir, "archives", fmt.Sprintf("sub-%d.txt", id)) |
| 82 | } |
| 83 | |
| 84 | // Delete removes the subscription and the download-archive file "skip" mode |
| 85 | // keeps for it. Leaving the archive behind would make a later subscription that |
| 86 | // reuses the id silently skip entries it never downloaded. The library |
| 87 | // directory is left alone: the archived media is the point of the tool. |
| 88 | func (s *SubscriptionService) Delete(id int64) error { |
| 89 | if err := s.SubscriptionRepository.Delete(id); err != nil { |
| 90 | return err |
| 91 | } |
| 92 | if err := os.Remove(s.ArchivePath(id)); err != nil && !os.IsNotExist(err) { |
| 93 | slog.Warn("failed to remove archive file", "subscription_id", id, "err", err) |
| 94 | } |
| 95 | return nil |
| 96 | } |
| 97 |