feat: revision on fix sample test, update readme and add rubocop-perf…

…ormance

instrumentation/aws_lambda/.rubocop.yml

@@ -0,0 +1 @@
+inherit_from: ../../.rubocop.yml

instrumentation/aws_lambda/README.md

@@ -17,10 +17,9 @@ Or, if you use [bundler][bundler-home], include `opentelemetry-instrumentation-a
 From the Lambda Layer side, create the wrapper. More information can be found at https://github.com/open-telemetry/opentelemetry-lambda
 ```ruby
 require 'opentelemetry/sdk'
-require 'opentelemetry/instrumentation/all'
+require 'opentelemetry/instrumentation/aws_lambda'
 OpenTelemetry::SDK.configure do |c|
   c.service_name = '<YOUR_SERVICE_NAME>'
-  c.use_all()
 end
 
 def otel_wrapper(event:, context:)

instrumentation/aws_lambda/example/trace_demonstration.rb

@@ -27,6 +27,32 @@ def initialize(aws_request_id:, invoked_function_arn:)
   end
 end
 
+# To accommendate the test case, handler class doesn't need to require the sample file if it's required here
+# In lambda environment, the env will find the handler file.
+module OpenTelemetry
+  module Instrumentation
+    module AwsLambda
+      class Handler
+        def resolve_original_handler
+          original_handler = ENV['ORIG_HANDLER'] || ENV['_HANDLER'] || ''
+          original_handler_parts = original_handler.split('.')
+          if original_handler_parts.size == 2
+            handler_file, @handler_method = original_handler_parts
+          elsif original_handler_parts.size == 3
+            handler_file, @handler_class, @handler_method = original_handler_parts
+          else
+            OpenTelemetry.logger.warn("aws-lambda instrumentation: Invalid handler #{original_handler}, must be of form FILENAME.METHOD or FILENAME.CLASS.METHOD.")
+          end
+
+          # require handler_file #-> don't require file for this sample test
+
+          original_handler
+        end
+      end
+    end
+  end
+end
+
 def otel_wrapper(event:, context:)
   otel_wrapper = OpenTelemetry::Instrumentation::AwsLambda::Handler.new()
   otel_wrapper.call_wrapped(event: event, context: context)

instrumentation/aws_lambda/opentelemetry-instrumentation-aws_lambda.gemspec

@@ -37,6 +37,7 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency 'pry-byebug' unless RUBY_ENGINE == 'jruby'
   spec.add_development_dependency 'rspec-mocks'
   spec.add_development_dependency 'rubocop', '~> 1.56.1'
+  spec.add_development_dependency 'rubocop-performance', '~> 1.19.1'
   spec.add_development_dependency 'simplecov', '~> 0.17.1'
   spec.add_development_dependency 'webmock', '~> 3.19'
   spec.add_development_dependency 'yard', '~> 0.9'