handler.rb in rack-2.1.0

- old
+ new

@@ -1,5 +1,7 @@
+# frozen_string_literal: true
+
 module Rack
   # *Handlers* connect web servers with Rack.
   #
   # Rack includes Handlers for Thin, WEBrick, FastCGI, CGI, SCGI
   # and LiteSpeed.
@@ -15,11 +17,11 @@
       unless @handlers.include? server
         load_error = try_require('rack/handler', server)
       end
 
       if klass = @handlers[server]
-        klass.split("::").inject(Object) { |o, x| o.const_get(x) }
+        const_get(klass)
       else
         const_get(server, false)
       end
 
     rescue NameError => name_error
@@ -41,19 +43,22 @@
       end
 
       raise LoadError, "Couldn't find handler for: #{server_names.join(', ')}."
     end
 
+    SERVER_NAMES = %w(puma thin falcon webrick).freeze
+    private_constant :SERVER_NAMES
+
     def self.default
       # Guess.
       if ENV.include?("PHP_FCGI_CHILDREN")
         Rack::Handler::FastCGI
       elsif ENV.include?(REQUEST_METHOD)
         Rack::Handler::CGI
       elsif ENV.include?("RACK_HANDLER")
         self.get(ENV["RACK_HANDLER"])
       else
-        pick ['puma', 'thin', 'webrick']
+        pick SERVER_NAMES
       end
     end
 
     # Transforms server-name constants to their canonical form as filenames,
     # then tries to require them but silences the LoadError if not found