Move ssl detection to puma.rb

puma.rb loads puma/puma_http11, which contains the compiled c code for ssl.  Move ssl detection from puma/detect.rb to puma.rb

lib/puma.rb

@@ -19,6 +19,24 @@ module Puma
   autoload :Server, 'puma/server'
   autoload :Launcher, 'puma/launcher'
 
+  # at present, MiniSSL::Engine is only defined in extension code (puma_http11),
+  # not in minissl.rb
+  HAS_SSL = const_defined?(:MiniSSL, false) && MiniSSL.const_defined?(:Engine, false)
+
+  if HAS_SSL
+    require 'puma/minissl'
+  else
+    module MiniSSL
+      # this class is defined so that it exists when Puma is compiled
+      # without ssl support, as Server and Reactor use it in rescue statements.
+      class SSLError < StandardError ; end
+    end
+  end
+
+  def self.ssl?
+    HAS_SSL
+  end
+
   # @!attribute [rw] stats_object=
   def self.stats_object=(val)
     @get_stats = val
@@ -40,12 +58,4 @@ def self.set_thread_name(name)
     return unless Thread.current.respond_to?(:name=)
     Thread.current.name = "puma #{name}"
   end
-
-  unless HAS_SSL
-    module MiniSSL
-      # this class is defined so that it exists when Puma is compiled
-      # without ssl support, as Server and Reactor use it in rescue statements.
-      class SSLError < StandardError ; end
-    end
-  end
 end

lib/puma/detect.rb

@@ -1,28 +1,28 @@
 # frozen_string_literal: true
 
-module Puma
-  # at present, MiniSSL::Engine is only defined in extension code, not in minissl.rb
-  HAS_SSL = const_defined?(:MiniSSL, false) && MiniSSL.const_defined?(:Engine, false)
+# This file can be loaded independently of puma.rb, so it cannot have any code
+# that assumes puma.rb is loaded.
 
-  def self.ssl?
-    HAS_SSL
-  end
 
+module Puma
   IS_JRUBY = defined?(JRUBY_VERSION)
 
+  IS_WINDOWS = RUBY_PLATFORM =~ /mswin|mingw|cygwin/
+
+  # @version 5.2.0
+  IS_MRI = (RUBY_ENGINE == 'ruby' || RUBY_ENGINE.nil?)
+
   def self.jruby?
     IS_JRUBY
   end
 
-  IS_WINDOWS = RUBY_PLATFORM =~ /mswin|ming|cygwin/
-
   def self.windows?
     IS_WINDOWS
   end
 
   # @version 5.0.0
   def self.mri?
-    RUBY_ENGINE == 'ruby' || RUBY_ENGINE.nil?
+    IS_MRI
   end
 
   # @version 5.0.0