Fix trace_context propagation and prefer in_span.

Author: ioquatix

config/sus.rb

@@ -7,3 +7,6 @@
 
 require "covered/sus"
 include Covered::Sus
+
+require "opentelemetry/sdk"
+OpenTelemetry::SDK.configure

lib/traces/backend/open_telemetry/interface.rb

@@ -17,21 +17,7 @@ module OpenTelemetry
 
 			module Interface
 				def trace(name, attributes: nil, &block)
-					span = TRACER.start_span(name, attributes: attributes&.transform_keys(&:to_s))
-					
-					begin
-						if block.arity.zero?
-							yield
-						else
-							yield span
-						end
-					rescue Exception => error
-						span&.record_exception(error)
-						span&.status = ::OpenTelemetry::Trace::Status.error("Unhandled exception of type: #{error.class}")
-						raise
-					ensure
-						span&.finish
-					end
+					TRACER.in_span(name, attributes: attributes&.transform_keys(&:to_s), &block)
 				end
 
 				def trace_context=(context)
@@ -44,8 +30,8 @@ def trace_context=(context)
 					)
 
 					span = ::OpenTelemetry::Trace.non_recording_span(span_context)
-					
-					return ::OpenTelemetry::Trace.context_with_span(span)
+					context = ::OpenTelemetry::Trace.context_with_span(span)
+					::OpenTelemetry::Context.attach(context)
 				end
 
 				def trace_context(span = ::OpenTelemetry::Trace.current_span)

test/traces/backend/open_telemetry.rb

@@ -100,10 +100,9 @@ def my_span_and_context
 					trace_id: be == context.trace_id,
 				)
 
-				# It seems like OpenTelemetry doesn't really do anything in the testing environment, so we can't really check the parent_id?
-				# expect(span).to have_attributes(
-				# 	parent_id: be == context.parent_id
-				# )
+				expect(span).to have_attributes(
+					parent_span_id: be == context.parent_id
+				)
 			end
 		end
 	end