Posted on Jun 15, 2021

Phoenix umbrella proxy application.

#elixir #phoenixframework #phoenix #development

Hey everyone!

It's really long time to take me to start writing again. I was really busy trying to make the games as part of my free time company balconygames :) Good progress but it's not so good enough for the market because of the user acquisition is so expensive.

Today I've decided to share the example of the proxy application for umbrella Phoenix, probably it would be useful for someone who has the same issues like code reloading, websocket support. It has 4 apps inside of apps/, proxy, web(phoenix), admin(phoenix), db(shared ecto project). No more words, going to share::

defmodule YourApp.Proxy.Application do @moduledoc false use Application alias Phoenix.LiveReloader.Socket, as: LiveReloadSocket require Logger def start(_type, _args) do import Supervisor.Spec, warn: false require_code_reloading?(:your_app_web, YourAppWeb.Endpoint) opts = [strategy: :one_for_one, name: YourApp.Proxy.Supervisor] Supervisor.start_link(children(Mix.env()), opts) end def children(:test), do: [] def children(_) do proxy_children = [ { Plug.Cowboy, scheme: :http, plug: YourApp.Proxy.Builder, port: port(), dispatch: [ {:_, [ # your_app_web web_phoenix_live_reload(), web_phoenix_live_view(), web_websocket(), # your_app_admin admin_phoenix_live_reload(), admin_phoenix_live_view(), admin_websocket(), # proxy master_proxy() ]} ] } ] # - proxy endpoints # - /api endpoints # - /dev/admin pages # - web watchers for webpacker and code reloading # - admin watchers for webpacker and code reloading children = proxy_children ++ watcher_children( :your_app_web, YourAppWeb.Endpoint ) ++ watcher_children( :your_app_admin_web, YourAppAdminWeb.Endpoint ) children end defp watcher_children(otp_app, mod) do conf = Application.get_env(otp_app, mod) unless Mix.env() == :test do Enum.map(conf[:watchers], fn {cmd, args} -> {Phoenix.Endpoint.Watcher, watcher_args(cmd, args)} end) else [] end end defp watcher_args(cmd, cmd_args) do {args, opts} = Enum.split_while(cmd_args, &is_binary(&1)) {cmd, args, opts} end def port do (System.get_env("PORT") || "4000") |> String.to_integer() end def web_phoenix_live_reload do websocket_handler( "/phoenix/live_reload/socket/websocket", YourAppWeb.Endpoint, {LiveReloadSocket, :websocket} ) end def web_phoenix_live_view do websocket_handler( "/live", YourAppWeb.Endpoint, {Phoenix.LiveView.Socket, :websocket} ) end def web_websocket do websocket_handler( "/cable/websocket", YourAppWeb.Endpoint, {YourAppWeb.UserSocket, websocket: true} ) end def admin_phoenix_live_reload do websocket_handler( "/dev/admin/phoenix/live_reload/socket/websocket", YourAppAdminWeb.Endpoint, {LiveReloadSocket, :websocket} ) end def admin_phoenix_live_view do websocket_handler( "/dev/admin/live", YourAppAdminWeb.Endpoint, {Phoenix.LiveView.Socket, :websocket} ) end def admin_websocket do websocket_handler( "/dev/admin/websocket", YourAppAdminWeb.Endpoint, {YourAppAdminWeb.UserSocket, websocket: true} ) end def master_proxy do {:_, Plug.Cowboy.Handler, {YourApp.Proxy.Plug, []}} end defp websocket_handler(path, endpoint, options) do {path, Phoenix.Endpoint.Cowboy2Handler, {endpoint, options}} end defp require_code_reloading?(otp_app, mod) do conf = Application.get_env(otp_app, mod) if conf[:code_reloader] do Phoenix.CodeReloader.Server.check_symlinks() end end end