products-loaded.guard.ts

@Injectable({ 
  providedIn: P2pBazaarAnchorModule
 })
export class ProductsLoadedGuard implements CanActivate {
  constructor(private store: Store<fromStore.AppState>) {}

  canActivate(): Observable<boolean> {
    return this.waitForProductsToLoad().pipe(
        switchMap(() => of(true)),
        catchError(() => of(false))
    );
  }

  waitForProductsToLoad(): Observable<boolean> {
      return this.store.pipe(
        select(fromStore.isProductsLoaded),
        tap(loaded => {
          if (!loaded) {
            this.store.dispatch(PurchaseContractActions.loadProducts());

          }
        }),
        filter(loaded => loaded),
        take(1)
      );
  }
}