Replace cowboy with bandit as HTTP server

.credo.exs

@@ -46,7 +46,7 @@
       # If you want to enforce a style guide and need a more traditional linting
       # experience, you can change `strict` to `true` below:
       #
-      strict: true, # false,
+      strict: true,
       #
       # To modify the timeout for parsing files, change this value:
       #

.formatter.exs

@@ -0,0 +1,3 @@
+[
+  inputs: ["*.{heex,ex,exs}", "{config,lib,test}/**/*.{heex,ex,exs}", "priv/*/seeds.exs"]
+]

README.md

@@ -1,7 +1,7 @@
 # FunWithFlags.UI
 
 [![Mix Tests](https://github.com/tompave/fun_with_flags_ui/workflows/Mix%20Tests/badge.svg)](https://github.com/tompave/fun_with_flags_ui/actions?query=branch%3Amaster)
-[![Code Quality](https://github.com/tompave/fun_with_flags_ui/actions/workflows/quality.yml/badge.svg?branch=master)](https://github.com/tompave/fun_with_flags_ui/actions/workflows/quality.yml?query=branch%3Amaster)  
+[![Code Quality](https://github.com/tompave/fun_with_flags_ui/actions/workflows/quality.yml/badge.svg?branch=master)](https://github.com/tompave/fun_with_flags_ui/actions/workflows/quality.yml?query=branch%3Amaster)
 [![Hex.pm](https://img.shields.io/hexpm/v/fun_with_flags_ui.svg)](https://hex.pm/packages/fun_with_flags_ui)
 
 A Web dashboard for the [FunWithFlags](https://github.com/tompave/fun_with_flags) Elixir package.
@@ -56,7 +56,7 @@ Again, because it's just a plug, it can be run [standalone](https://hexdocs.pm/p
 If you clone the repository, the library comes with two convenience functions to accomplish this:
 
 ```elixir
-# Simple, let Cowboy sort out the supervision tree:
+# Simple, let Bandit sort out the supervision tree:
 {:ok, pid} = FunWithFlags.UI.run_standalone()
 
 # Uses some explicit supervision configuration:
@@ -115,7 +115,7 @@ For this reason this library enforces some stricter rules when creating flags an
 
 ## Installation
 
-The package can be installed by adding `fun_with_flags_ui` to your list of dependencies in `mix.exs`.  
+The package can be installed by adding `fun_with_flags_ui` to your list of dependencies in `mix.exs`.
 It requires [`fun_with_flags`](https://hex.pm/packages/fun_with_flags), see its [installation documentation](https://github.com/tompave/fun_with_flags#installation) for more details.
 
 ```elixir

compose.yaml

@@ -0,0 +1,5 @@
+services:
+  redis:
+    image: redis:8
+    ports:
+      - "6379:6379"

config/config.exs

@@ -10,5 +10,5 @@ config :fun_with_flags, :cache_bust_notifications, enabled: false
 
 case config_env() do
   :test -> import_config "test.exs"
-  _     -> nil
+  _ -> nil
 end

lib/fun_with_flags/ui.ex

@@ -9,48 +9,49 @@ defmodule FunWithFlags.UI do
 
   @doc false
   def start(_type, _args) do
-    check_cowboy()
+    check_bandit()
 
     children = [
-      {Plug.Cowboy, scheme: :http, plug: FunWithFlags.UI.Router, options: [port: 8080]}
+      {Bandit, scheme: :http, plug: FunWithFlags.UI.Router, options: [port: 8080]}
     ]
 
     opts = [strategy: :one_for_one, name: FunWithFlags.UI.Supervisor]
     Supervisor.start_link(children, opts)
   end
 
-
-  # Since :cowboy is an optional dependency, if we want to run this
-  # standalone we want to return a clear error message if Cowboy is
+  # Since :bandit is an optional dependency, if we want to run this
+  # standalone we want to return a clear error message if Bandit is
   # missing.
   #
   # On the other hand, if :fun_with_flags_ui is run as a Plug in a
   # host application, we don't really care about this dependency
   # here, as the responsibility of managing the HTTP layer belongs
   # to the host app.
   #
-  defp check_cowboy do
-    with :ok <- Application.ensure_started(:ranch),
-         :ok <- Application.ensure_started(:cowlib),
-         :ok <- Application.ensure_started(:cowboy) do
-      :ok
-    else
+  defp check_bandit do
+    case Application.ensure_started(:bandit) do
+      :ok ->
+        :ok
+
       {:error, _} ->
-        raise "You need to add :cowboy to your Mix dependencies to run FunWithFlags.UI standalone."
+        raise "You need to add :bandit to your Mix dependencies to run FunWithFlags.UI standalone."
     end
   end
 
-
   @doc """
-  Convenience function to simply run the Plug in Cowboy.
+  Convenience function to simply run the Plug in Bandit.
 
   This _will_ be supervided, but in the private supervsion tree
-  of :cowboy and :ranch.
+  of :bandit.
   """
   def run_standalone do
-    Plug.Cowboy.http FunWithFlags.UI.Router, [], port: 8080
-  end
+    server_opts = [
+      plug: FunWithFlags.UI.Router,
+      port: 8080
+    ]
 
+    Bandit.start_link(server_opts)
+  end
 
   @doc """
   Convenience function to run the Plug in a custom supervision tree.