Aws.eager_autoload! now loads non-service utility classes.

Fixes #833

aws-sdk-core/lib/aws-sdk-core.rb

@@ -191,7 +191,6 @@ module Response
   # @api private
   module Signers
     autoload :Base, 'aws-sdk-core/signers/base'
-    autoload :Handler, 'aws-sdk-core/signers/handler'
     autoload :S3, 'aws-sdk-core/signers/s3'
     autoload :V2, 'aws-sdk-core/signers/v2'
     autoload :V3, 'aws-sdk-core/signers/v3'
@@ -285,16 +284,25 @@ def eager_autoload!(options = {})
       eager_loader = EagerLoader.new
       eager_loader.load(JMESPath)
       eager_loader.load(Seahorse)
-      (options[:services] || SERVICE_MODULE_NAMES).each do |svc_name|
-        begin
-          eager_loader.load(Aws.const_get(svc_name))
-        rescue NameError
-          raise ArgumentError, "invalid service Aws::#{svc_name}"
-        end
+      sub_modules(options).each do |module_or_class|
+        eager_loader.load(module_or_class)
       end
       eager_loader
     end
 
+    def sub_modules(options = {})
+      constants = Aws.constants.map(&:to_s)
+      if options[:services]
+        constants -= SERVICE_MODULE_NAMES
+        constants += options[:services] || SERVICE_MODULE_NAMES
+      end
+      constants.inject([]) do |modules, const_name|
+        constant = Aws.const_get(const_name)
+        modules << constant if Module === constant
+        modules
+      end
+    end
+
     # Yields to the given block for each service that has already been
     # defined via {add_service}. Also yields to the given block for
     # each new service added after the callback is registered.

aws-sdk-core/spec/aws_spec.rb

@@ -132,5 +132,10 @@ module Aws
       expect(eager_loader.loaded).not_to include(Aws::EC2)
     end
 
+    it  'loads non-service modules' do
+      eager_loader = Aws.eager_autoload!
+      expect(eager_loader.loaded).to include(Aws::Xml)
+    end
+
   end
 end