feat: add untraced ctx method (#1634)

* feat: Support non block structured untraced context

Author: robertlaurin

common/.rubocop.yml

@@ -6,6 +6,8 @@ Bundler/OrderedGems:
 Style/FrozenStringLiteralComment:
   Exclude:
     - gemfiles/**/*
+Style/ExplicitBlockArgument:
+  Enabled: false
 Style/StringLiterals:
   Exclude:
     - gemfiles/**/*

common/lib/opentelemetry/common/utilities.rb

@@ -88,10 +88,17 @@ def truncate_attribute_value(value, limit)
         end
       end
 
-      # Disables tracing within the provided block.
-      def untraced
-        Context.with_value(UNTRACED_KEY, true) do |ctx, _|
-          yield ctx
+      # Disables tracing within the provided block
+      # If no block is provided instead returns an
+      # untraced ctx.
+      #
+      # @param [optional Context] context Accepts an explicit context, defaults to current
+      def untraced(context = Context.current)
+        context = context.set_value(UNTRACED_KEY, true)
+        if block_given?
+          Context.with_current(context) { |ctx| yield ctx }
+        else
+          context
         end
       end
 

common/test/opentelemetry/common/utilities_test.rb

@@ -26,6 +26,13 @@ def shutdown(timeout: nil); end
       common_utils.untraced {}
       assert_equal(false, common_utils.untraced?)
     end
+
+    it 'supports non block format' do
+      token = OpenTelemetry::Context.attach(common_utils.untraced)
+      assert_equal(true, common_utils.untraced?)
+      OpenTelemetry::Context.detach(token)
+      assert_equal(false, common_utils.untraced?)
+    end
   end
 
   describe '#utf8_encode' do