Support launching with rackup on Rack 3

CHANGELOG.md

@@ -1,5 +1,6 @@
 ## [Unreleased]
 ### Added
+- Support launching with `rackup` on Rack 3 by [@pratyush07-hub](https://github.com/pratyush07-hub) (#259).
 - [Deferred] Add tests for log context capture and backward-compatible restore by [@jsxs0](https://github.com/jsxs0) (#274).
 - [OpenAPI] Add support for per-endpoint OAuth2/OpenID scopes via `@auth_scope` tag by [@Piyush-Goenka](https://github.com/Piyush-Goenka) (#272).
 - Reuse `define_dynamic_method` and `define_maybe_yield` methods in `RageController::API` from `Rage::Internal` by [@numice](https://github.com/numice) (#273).

lib/rack/handler/rage.rb

@@ -0,0 +1,2 @@
+require "rage"
+Rack::Handler.register("rage", "Rage::Handler") if defined?(Rack::Handler)

lib/rackup/handler/rage.rb

@@ -0,0 +1,2 @@
+require "rage"
+Rackup::Handler.register("rage", "Rage::Handler") if defined?(Rackup::Handler)

lib/rage-rb.rb

@@ -7,8 +7,12 @@
 
 module Rage
   # Builds the Rage application with the configured middlewares.
+  def self.application=(app)
+    @application = app
+  end
+
   def self.application
-    with_middlewares(Application.new(__router), config.middleware.middlewares)
+    @application ||= with_middlewares(Application.new(__router), config.middleware.middlewares)
   end
 
   # Builds the Rage application which delegates Rails requests to `Rails.application`.
@@ -200,3 +204,10 @@ module RageController
 
 require_relative "rage/env"
 require_relative "rage/internal"
+require_relative "rage/handler"
+
+begin
+  ::Rack::Handler.register("rage", "Rage::Handler") if defined?(::Rack::Handler)
+  ::Rackup::Handler.register("rage", "Rage::Handler") if defined?(::Rackup::Handler)
+rescue
+end

lib/rage/cli.rb

@@ -83,12 +83,12 @@ def new(path = nil)
     option :binding, aliases: "-b", desc: "Binds Rails to the specified IP - defaults to 'localhost' in development and '0.0.0.0' in other environments"
     option :config, aliases: "-c", desc: "Uses a custom rack configuration"
     option :help, aliases: "-h", desc: "Show this message"
-    def server
+    def server(app: nil)
       return help("server") if options.help?
 
       set_env(options)
-
-      app = ::Rack::Builder.parse_file(options[:config] || "config.ru")
+      Rage.configure { config.log_level = :error } if options[:quiet]
+      app ||= ::Rack::Builder.parse_file(options[:config] || "config.ru")
       app = app[0] if app.is_a?(Array)
 
       server_options = { service: :http, handler: app }

lib/rage/handler.rb

@@ -0,0 +1,19 @@
+module Rage
+  module Handler
+    def self.name
+      "Rage"
+    end
+
+    def self.run(app, options = {})
+      Rage.application = app
+
+      cli_options = {}
+      cli_options[:port] = options[:Port] if options[:Port]
+      cli_options[:binding] = options[:Host] if options[:Host]
+      cli_options[:environment] = options[:environment] if options[:environment]
+      cli_options[:quiet] = options[:quiet] if options[:quiet]
+
+      Rage::CLI.new([], cli_options).server(app: app)
+    end
+  end
+end