defmodule Prymn.Agents do
  @moduledoc ~S"""
  Prymn Agents are programs that manage a remote client machine. Prymn backend
  communicates with them using GRPC calls. GRPC connections are started using
  the Prymn.Agents.Supervisor (a DynamicSupervisor) and are book-kept using the
  Prymn.Agents.Registry.
  """

  def start_connection_or_keep_alive(ip) do
    case Registry.lookup(Prymn.Agents.Registry, ip) do
      [{pid, _}] ->
        Prymn.Agents.Connection.keep_alive(pid)

      [] ->
        child = {Prymn.Agents.Connection, ip}
        {:ok, _pid} = DynamicSupervisor.start_child(Prymn.Agents.Supervisor, child)
    end
  end
end