Allow toggling background sending on the fly

sentry-ruby/CHANGELOG.md

@@ -1,5 +1,11 @@
 # Changelog
 
+## Unreleased
+
+### Bug Fixes
+
+- Allow toggling background sending on the fly [#1447](https://github.com/getsentry/sentry-ruby/pull/1447) 
+
 ## 4.4.2
 
 - Fix NoMethodError when SDK's dsn is nil [#1433](https://github.com/getsentry/sentry-ruby/pull/1433)

sentry-ruby/lib/sentry/client.rb

@@ -30,7 +30,7 @@ def capture_event(event, scope, hint = {})
 
       if async_block = configuration.async
         dispatch_async_event(async_block, event, hint)
-      elsif hint.fetch(:background, true)
+      elsif configuration.background_worker_threads != 0 && hint.fetch(:background, true)
         dispatch_background_event(event, hint)
       else
         send_event(event, hint)

sentry-ruby/spec/sentry/client/event_sending_spec.rb

@@ -112,6 +112,16 @@
           expect(transport.events.count).to eq(1)
         end
       end
+
+      context "with config.background_worker_threads set to 0 on the fly" do
+        it "sends the event immediately" do
+          configuration.background_worker_threads = 0
+
+          subject.capture_event(event, scope)
+
+          expect(transport.events.count).to eq(1)
+        end
+      end
     end
   end