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Postgres sync engine. Sync little subsets of your Postgres data into local apps and services.

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electric lib electric plug health_check_plug.ex
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lib/electric/plug/health_check_plug.ex 

defmodule Electric.Plug.HealthCheckPlug do

  alias Plug.Conn

  require Logger

  use Plug.Builder



  plug :check_service_status

  plug :put_relevant_headers

  plug :send_response



  # Match service status to a status code and status message,

  # keeping the message name decoupled from the internal representation

  # of the status to ensure the API is stable

  defp check_service_status(conn, _) do

    get_service_status = Access.fetch!(conn.assigns.config, :get_service_status)



    {status_code, status_text} =

      case get_service_status.() do

        :waiting -> {200, "waiting"}

        :starting -> {200, "starting"}

        :active -> {200, "active"}

        :stopping -> {503, "stopping"}

      end



    conn |> assign(:status_text, status_text) |> assign(:status_code, status_code)

  end



  defp put_relevant_headers(conn, _),

    do:

      conn

      |> put_resp_header("content-type", "application/json")

      |> put_resp_header("cache-control", "no-cache, no-store, must-revalidate")



  defp send_response(

         %Conn{assigns: %{status_text: status_text, status_code: status_code}} = conn,

         _

       ),

       do: send_resp(conn, status_code, Jason.encode!(%{status: status_text}))

end