Map the Exception of a failed Future

Question

What\'s the cleanest way to map the Exception of a failed Future in scala?

Say I have:

import scala.concurrent         


        

Answer 1

There is also:

f recover { case cause => throw new Exception("Something went wrong", cause) }

Since Scala 2.12 you can do:

f transform {
  case s @ Success(_) => s
  case Failure(cause) => Failure(new Exception("Something went wrong", cause))
}

or

f transform { _.transform(Success(_), cause => Failure(new Exception("Something went wrong", cause)))}

Answer 2

You could try recoverWith as in:

f recoverWith{
  case ex:Exception => Future.failed(new Exception("foo", ex))
}