Remove nio from status server

History.md

@@ -10,6 +10,7 @@
 * Bugfixes
   * Your bugfix goes here <Most recent on the top, like GitHub> (#Github Number)
   * Fix compiler warnings, but skipped warnings related to ragel state machine generated code ([#1953])
+  * Fix phased restart errors related to nio4r gem when using the Puma control server (#2516)
 
 
 ## 5.1.1 / 2020-12-10

lib/puma/runner.rb

@@ -55,7 +55,7 @@ def start_control
       app = Puma::App::Status.new @launcher, token
 
       control = Puma::Server.new app, @launcher.events,
-        { min_threads: 0, max_threads: 1 }
+        { min_threads: 0, max_threads: 1, queue_requests: false }
 
       control.binder.parse [str], self, 'Starting control server'
 

test/config/prune_bundler_print_nio_defined.rb

@@ -0,0 +1,4 @@
+prune_bundler true
+before_fork do
+  puts "defined?(::NIO): #{defined?(::NIO).inspect}"
+end

test/test_integration_cluster.rb

@@ -283,6 +283,25 @@ def test_json_gem_not_required_in_master_process
     assert_match(/defined\?\(::JSON\): nil/, line)
   end
 
+  def test_nio4r_gem_not_required_in_master_process
+    cli_server "-w #{workers} -C test/config/prune_bundler_print_nio_defined.rb test/rackup/hello.ru"
+
+    line = @server.gets
+    assert_match(/defined\?\(::NIO\): nil/, line)
+  end
+
+  def test_nio4r_gem_not_required_in_master_process_when_using_control_server
+    @control_tcp_port = UniquePort.call
+    control_opts = "--control-url tcp://#{HOST}:#{@control_tcp_port} --control-token #{TOKEN}"
+    cli_server "-w #{workers} #{control_opts} -C test/config/prune_bundler_print_nio_defined.rb test/rackup/hello.ru"
+
+    line = @server.gets
+    assert_match(/Starting control server/, line)
+
+    line = @server.gets
+    assert_match(/defined\?\(::NIO\): nil/, line)
+  end
+
   def test_application_is_loaded_exactly_once_if_using_preload_app
     cli_server "-w #{workers} --preload test/rackup/write_to_stdout_on_boot.ru"