Add on_booted event for single mode

lib/puma/dsl.rb

@@ -588,6 +588,18 @@ def after_worker_fork(&block)
       @options[:after_worker_fork] << block
     end
 
+    # Code to run after puma is booted in a single mode
+    #
+    # @note Single mode only.
+    # @example
+    #   on_booted do
+    #     puts 'After booting...'
+    #   end
+    def on_booted(&block)
+      @options[:on_booted] ||= []
+      @options[:on_booted] << block
+    end
+
     alias_method :after_worker_boot, :after_worker_fork
 
     # When `fork_worker` is enabled, code to run in Worker 0

lib/puma/single.rb

@@ -52,6 +52,8 @@ def run
       @server = server = start_server
       server_thread = server.run
 
+      @launcher.config.run_hooks :on_booted, nil, @launcher.events
+
       log "Use Ctrl-C to stop"
       redirect_io
 

test/test_config.rb

@@ -317,6 +317,10 @@ def test_run_hooks_before_fork
     assert_run_hooks :before_fork
   end
 
+  def test_run_hooks_on_booted
+    assert_run_hooks :on_booted
+  end
+
   def test_run_hooks_and_exception
     conf = Puma::Configuration.new do |c|
       c.on_restart do |a|