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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 epmd.ex
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lib/strategy/epmd.ex 

defmodule Cluster.Strategy.Epmd do

  @moduledoc """

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



  You can have libcluster automatically connect nodes on startup for you by configuring

  the strategy like below:



      config :libcluster,

        topologies: [

          epmd_example: [

            strategy: #{__MODULE__},

            config: [

              hosts: [:"a@127.0.0.1", :"b@127.0.0.1"]]]]



  """

  use Cluster.Strategy



  def child_spec(opts) do

    %{

      id: __MODULE__,

      start: {__MODULE__, :start_link, [opts]},

      type: :worker,

      restart: :permanent,

      shutdown: 500

    }

  end



  def start_link(opts) do

    topology = Keyword.fetch!(opts, :topology)

    config = Keyword.get(opts, :config, [])

    connect = Keyword.fetch!(opts, :connect)

    list_nodes = Keyword.fetch!(opts, :list_nodes)



    case Keyword.get(config, :hosts, []) do

      [] ->

        :ignore



      nodes when is_list(nodes) ->

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

        :ignore

    end

  end

end