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libcluster

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Automatic Erlang cluster formation and management for Elixir/Erlang applications

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libcluster lib strategy local_epmd.ex
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lib/strategy/local_epmd.ex 

defmodule Cluster.Strategy.LocalEpmd do

  @moduledoc """

  This clustering strategy relies on Erlang's built-in distribution protocol.



  Unlike Cluster.Strategy.Empd, this strategy assumes that all nodes are on

  the local host and can be discovered by epmd.



  It should be configured as follows:



      config :libcluster,

        topologies: [

          local_epmd_example: [

            strategy: #{__MODULE__}]]



  """

  use Cluster.Strategy



  alias Cluster.Strategy.State



  def start_link([%State{} = state]) do

    nodes = discover_nodes()



    Cluster.Strategy.connect_nodes(state.topology, state.connect, state.list_nodes, nodes)

    :ignore

  end



  defp discover_nodes do

    suffix = get_host_suffix(Node.self())



    {:ok, names} = :erl_epmd.names()

    for {n, _} <- names, do: List.to_atom(n ++ suffix)

  end



  defp get_host_suffix(self) do

    self = Atom.to_charlist(self)

    [_, suffix] = :string.split(self, '@')

    '@' ++ suffix

  end

end