Add region to log formatter (#2851)

Author: mullermp

gems/aws-sdk-core/CHANGELOG.md

@@ -1,6 +1,8 @@
 Unreleased Changes
 ------------------
 
+* Feature - Add :region option to `Aws::Log::Formatter`.
+
 3.171.1 (2023-05-04)
 ------------------
 

gems/aws-sdk-core/lib/aws-sdk-core/log/formatter.rb

@@ -26,6 +26,8 @@ module Log
     #
     # You can put any of these placeholders into you pattern.
     #
+    #   * `:region` - The region configured for the client.
+    #
     #   * `:client_class` - The name of the client class.
     #
     #   * `:operation` - The name of the client request method.
@@ -116,6 +118,10 @@ def method_missing(method_name, *args)
 
       private
 
+      def _region(response)
+        response.context.config.region
+      end
+
       def _client_class(response)
         response.context.client.class.name
       end

gems/aws-sdk-core/spec/aws/log/formatter_spec.rb

@@ -18,6 +18,11 @@ def format(pattern, options = {})
       end
 
       describe '#format' do
+        it 'provides a :region replacement' do
+          response.context.config.region = 'us-peccy-1'
+          expect(format(':region')).to eq('us-peccy-1')
+        end
+
         it 'provides a :client_class replacement' do
           response.context.client = String.new
           expect(format(':client_class')).to eq('String')