ExAws add-on for AWS Service Discovery

service_discovery.ex

defmodule ExAws.ServiceDiscovery do
  @moduledoc """
  Minimal module to issue AWS Cloud Map requests with ExAws, which
  is used by clustering mechanisms.
  """

  alias ExAws.Operation.JSON
  @version "2017-03-14"
  @namespace "Route53AutoNaming_v20170314"

  def list_instances(service_id) do
    request(%{
      "Action" => "ListInstances",
      "ServiceId" => service_id
    })
  end

  defp request(%{"Action" => action} = params, opts \\ %{}) do
    headers = [
      {"x-amz-target", "#{@namespace}.#{action}"},
      {"content-type", "application/x-amz-json-1.1"}
    ]

    params = Map.merge(params, %{"Version" => @version})
    body = %{data: params, headers: headers} |> Map.merge(opts)
    JSON.new(:servicediscovery, body)
  end
end