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Spawn is the core lib for Spawn Actors System

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spawn lib spawn utils nats.ex
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lib/spawn/utils/nats.ex 

defmodule Spawn.Utils.Nats do

  @moduledoc false



  alias Eigr.Functions.Protocol.InvocationRequest



  import Spawn.Utils.Common, only: [to_existing_atom_or_new: 1]



  @spec request(String.t(), InvocationRequest.t(), Keyword.t()) :: any() | {:ok, :async}

  def request(system, payload, opts \\ []) do

    async? = Keyword.get(opts, :async, false)

    conn = connection_name()

    topic = get_topic(system)



    # TODO: Verify if necessary default value

    trace_context = Keyword.get(opts, :trace_context)



    case async? do

      false ->

        Gnat.request(conn, topic, InvocationRequest.encode(payload), headers: trace_context)



      true ->

        :ok = Gnat.pub(conn, topic, InvocationRequest.encode(payload), headers: trace_context)



        {:ok, :async}

    end

  end



  @spec connection_name() :: atom()

  def connection_name(), do: to_existing_atom_or_new("spawn.internal.nats")



  def get_internal_nats_connection(config) do

    raw_hosts = config.internal_nats_hosts

    hosts_conn_map = get_nats_hosts(raw_hosts)



    # TODO: Get other parameters here to build complex connections



    hosts_conn_map

  end



  @spec get_nats_connection(map()) :: map()

  def get_nats_connection(config) do

    raw_hosts = config.pubsub_adapter_nats_hosts

    hosts_conn_map = get_nats_hosts(raw_hosts)



    # TODO: Get other parameters here to build complex connections



    hosts_conn_map

  end



  @spec get_topic(String.t()) :: String.t()

  def get_topic(system), do: "spawn.#{system}.actors.actions"



  defp get_nats_hosts(raw_hosts) do

    String.split(raw_hosts, ",")

    |> Enum.map(fn host ->

      host_port = String.replace(host, "nats://", "")

      host = String.split(host_port, ":") |> List.first()

      port = String.split(host_port, ":") |> List.last() |> String.to_integer()

      %{host: host, port: port, no_responders: true}

    end)

    |> List.first()

  end

end