guardIf

[ChristopherDavenport]

This function can be on the comapnaion object and will make it easy to avoid some errors from tripping the circuit breaker.

def guardIf[F[_]: MonadError[?[_], Throwable], A](cb: Circuit[F], fa: F[A])(guardThisThrowable: Throwable => Boolean): F[A] = {
  c.guard(
    fa.attempt.flatMap{
      case l@Left(e) => if (guardThisThrowable(e)) F.raiseError(e) else l
      case r@Right(_) => r
    }
  ).rethrow
}