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import ( "context" "errors")
// MultiNotifier fans a single blast out to every transport it wraps. It// implements Notifier by delegating each target to the child notifier that// handles that target's Type. This is the single Notifier the rest of the// codebase holds (replacing the old FirebaseNotifier field), so callers don't// need to know which transports are configured.//// A child that returns an error for its slice of targets does not abort the// others — each transport is independent, and a dead FCM credential// shouldn't block web pushes (or vice versa). Errors are collected and// returned as a joined error after all transports have been attempted.type MultiNotifier struct { notifiers []Notifier}
// NewMultiNotifier wraps one or more transport notifiers. nil entries are// skipped so callers can pass a possibly-unconfigured notifier through// without filtering.func NewMultiNotifier(notifiers ...Notifier) *MultiNotifier { nn := &MultiNotifier{} for _, n := range notifiers { if n != nil { nn.notifiers = append(nn.notifiers, n) } } return nn}
func (m *MultiNotifier) Blast(ctx context.Context, targets []NotificationTarget, blast *NotificationBlast) error { if len(m.notifiers) == 0 { return nil } var errs []error for _, n := range m.notifiers { if err := n.Blast(ctx, targets, blast); err != nil { errs = append(errs, err) } } // errors.Join preserves the tree so callers can errors.As into the // individual transport errors (e.g. to extract expired web tokens). return errors.Join(errs...)}