A simple master/worker implementation in elixir without using the built in supervisors

master_and_worker.ex

def master do
  IO.puts "Beginning"
  parent = self
  spawn(fn -> worker(parent) end)
  master_listener
end

def master_listener do
  IO.puts "listening"
  parent = self
  receive do 
    {:fail, msg} -> IO.puts msg 
      IO.puts "re-running!"
      spawn(fn -> worker(parent) end)
      master_listener
  end
end

def worker(parent) do
  rand_num = :random.uniform(10000)

  cond do
    rand_num == 1 ->
      IO.puts "Oh no, an error!"
      IO.puts Process.alive?(parent)
      send(parent, {:fail, "Failed"})

      Process.exit(self, :fail)
    rand_num >= 2 ->
      IO.puts "Smooth Sailing"

      send(parent, {:succeed, "All good!"})
      worker(parent)

  end
end