fix: register lambda span (#1073)

* fix: register lambda span

* avoid use instance variable

* revision

Author: xuan-cao-swi

instrumentation/aws_lambda/README.md

@@ -36,6 +36,7 @@ To run the example:
 	* `bundle install`
 2. Run the sample client script
 	* `ruby trace_demonstration.rb`
+	* or `bundle exec ruby trace_demonstration.rb`
 
 This will run SNS publish command, printing OpenTelemetry traces to the console as it goes.
 

instrumentation/aws_lambda/example/trace_demonstration.rb

@@ -97,6 +97,6 @@ def otel_wrapper(event:, context:)
    "version" => "1.0"
 }
 
-context = MockLambdaContext.new(aws_request_id: "aws_request_id",invoked_function_arn: "invoked_function_arn",function_name: "function")
+context = MockLambdaContext.new(aws_request_id: "aws_request_id",invoked_function_arn: "arn:aws:lambda:us-west-2:123456789012:function:HelloWorld",function_name: "function")
 
 otel_wrapper(event: event, context: context) # you should see Success before the trace

instrumentation/aws_lambda/lib/opentelemetry/instrumentation/aws_lambda/handler.rb

@@ -40,33 +40,25 @@ def call_wrapped(event:, context:)
           original_handler_error = nil
           original_response = nil
           OpenTelemetry::Context.with_current(parent_context) do
-            span_attributes = otel_attributes(event, context)
-            span = tracer.start_span(
-              @original_handler,
-              attributes: span_attributes,
-              kind: span_kind
-            )
-
-            begin
-              response = call_original_handler(event: event, context: context)
-              status_code = response['statusCode'] || response[:statusCode] if response.is_a?(Hash)
-              span.set_attribute(OpenTelemetry::SemanticConventions::Trace::HTTP_STATUS_CODE, status_code) if status_code
-            rescue StandardError => e
-              original_handler_error = e
-            ensure
-              original_response = response
+            tracer.in_span(@original_handler, attributes: otel_attributes(event, context), kind: span_kind) do |span|
+              begin
+                response = call_original_handler(event: event, context: context)
+                status_code = response['statusCode'] || response[:statusCode] if response.is_a?(Hash)
+                span.set_attribute(OpenTelemetry::SemanticConventions::Trace::HTTP_STATUS_CODE, status_code) if status_code
+              rescue StandardError => e
+                original_handler_error = e
+              ensure
+                original_response = response
+              end
+              if original_handler_error
+                span.record_exception(original_handler_error)
+                span.status = OpenTelemetry::Trace::Status.error(original_handler_error.message)
+              end
             end
-          rescue StandardError => e
-            OpenTelemetry.logger.error("aws-lambda instrumentation #{e.class}: #{e.message}")
-          ensure
-            if original_handler_error
-              span&.record_exception(original_handler_error)
-              span&.status = OpenTelemetry::Trace::Status.error(original_handler_error.message)
-            end
-            span&.finish
-            OpenTelemetry.tracer_provider.force_flush(timeout: @flush_timeout)
           end
 
+          OpenTelemetry.tracer_provider.force_flush(timeout: @flush_timeout)
+
           raise original_handler_error if original_handler_error
 
           original_response

instrumentation/aws_lambda/test/opentelemetry/instrumentation_test.rb

@@ -214,4 +214,25 @@
       end
     end
   end
+
+  describe 'validate_if_span_is_registered' do
+    it 'add_span_attributes_to_lambda_span' do
+      stub = proc do
+        span = OpenTelemetry::Trace.current_span
+        span.set_attribute('test.attribute', 320)
+      end
+
+      otel_wrapper = OpenTelemetry::Instrumentation::AwsLambda::Handler.new
+      otel_wrapper.stub(:call_original_handler, stub) do
+        otel_wrapper.call_wrapped(event: sqs_record, context: context)
+
+        _(last_span.name).must_equal 'sample.test'
+        _(last_span.kind).must_equal :consumer
+        _(last_span.status.code).must_equal 1
+        _(last_span.hex_parent_span_id).must_equal '0000000000000000'
+
+        _(last_span.attributes['test.attribute']).must_equal 320
+      end
+    end
+  end
 end