SafeTask proof of concept: make a Task's raises, throws, and exits happen locally

safe_task.ex

defmodule SafeTask do
  def async(func) do
    safe_func = fn ->
      try do
        {:ok, func.()}
      rescue
        e -> {:error, e}
      catch
        :exit, x -> {:exit, x}
        t -> {:throw, t}
      end
    end

    Task.async(safe_func)
  end

  def await!(safe_task, timeout \\ 5000) do
    case await(safe_task, timeout) do
      {:ok, val} -> val
      {:error, e} -> raise e
      {:timeout, e} -> raise e
      {:throw, t} -> throw t
      {:exit, x} -> exit x
      _ -> raise "SafeTask error: this is unpossible"
    end
  end

  def await(safe_task, timeout \\ 5000) do
    try do
      Task.await(safe_task, timeout)
    rescue
      e -> {:timeout, e}
    end
  end
end