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High performance application-layer DDoS protection for Elixir Phoenix

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phoenix_ddos lib phoenix_ddos core request_context.ex
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lib/phoenix_ddos/core/request_context.ex 

defmodule PhoenixDDoS.RequestContext do

  @moduledoc false



  # store shared context over process



  def feed(%Plug.Conn{} = conn) do

    Process.put(:phoenix_ddos, %{

      ip: conn.remote_ip |> :inet.ntoa(),

      method: conn.method,

      request_path: conn.request_path,

      route: phoenix_route(conn)

    })

  end



  def get(key), do: Process.get(:phoenix_ddos)[key]



  def pull(:pretty) do

    %{ip: "#{get(:ip)}", method: get(:method), route: get(:route), path: get(:request_path)}

  end



  defp phoenix_route(conn) do

    Application.get_env(:phoenix_ddos, :routers)

    |> Enum.map(fn router ->

      {router, Phoenix.Router.route_info(router, conn.method, conn.request_path, nil)}

    end)

    |> Enum.filter(fn

      {_, %{route: _route}} -> true

      {_, _} -> false

    end)

    |> Enum.map(fn {router, %{route: route}} -> "[#{inspect(router)} #{route}]" end)

    |> case do

      [] -> "unknown route"

      routes -> routes |> Enum.join(" or ")

    end

  end

end