ha-handler/lib/ha_handler/web/controller.ex

defmodule HAHandler.Web.Controller do
	import Plug.Conn

	alias HAHandler.{HAProxy, PGSQL}

  @template_dir "lib/ha_handler/web/templates"
	@index_template EEx.compile_file(
		Path.join(@template_dir, "index.html.eex")
	)

	defp render(conn, template, assigns) do
		{body, _binding} = Code.eval_quoted(template, assigns)

		conn
		|> put_resp_content_type("text/html")
		|> send_resp(200, body)
	end

	def index(conn) do
		{:ok, hostname} = :net_adm.dns_hostname(:net_adm.localhost)

		stats = HAProxy.get_stats()

		assigns = [
			haproxy_stats: stats,
			pgsql_status: PGSQL.status(),
			hostname: hostname,
			otp_app: HAHandler.otp_app(),
			version: HAHandler.version(),
			env: HAHandler.env()
		]
		render(conn, @index_template, assigns)
	end
end