content: /*
   * Copyright The OpenTelemetry Authors
   * SPDX-License-Identifier: Apache-2.0
   */
  
  package io.opentelemetry.javaagent.instrumentation.vaadin;
  
  import static io.opentelemetry.javaagent.instrumentation.vaadin.VaadinSingletons.clientCallableInstrumenter;
  import static net.bytebuddy.matcher.ElementMatchers.named;
  import static net.bytebuddy.matcher.ElementMatchers.takesArgument;
  
  import io.opentelemetry.context.Context;
  import io.opentelemetry.context.Scope;
  import io.opentelemetry.javaagent.bootstrap.Java8BytecodeBridge;
  import io.opentelemetry.javaagent.extension.instrumentation.TypeInstrumentation;
  import io.opentelemetry.javaagent.extension.instrumentation.TypeTransformer;
  import net.bytebuddy.asm.Advice;
  import net.bytebuddy.description.type.TypeDescription;
  import net.bytebuddy.matcher.ElementMatcher;
  
  // add spans around calls to methods with @ClientCallable annotation
  public class ClientCallableRpcInstrumentation implements TypeInstrumentation {
  
    @Override
    public ElementMatcher<TypeDescription> typeMatcher() {
      return named("com.vaadin.flow.server.communication.rpc.PublishedServerEventHandlerRpcHandler");
    }
  
    @Override
    public void transform(TypeTransformer transformer) {
      transformer.applyAdviceToMethod(
          named("invokeMethod")
              .and(takesArgument(0, named("com.vaadin.flow.component.Component")))
              .and(takesArgument(1, named(Class.class.getName())))
              .and(takesArgument(2, named(String.class.getName())))
              .and(takesArgument(3, named("elemental.json.JsonArray")))
              .and(takesArgument(4, named(int.class.getName()))),
          this.getClass().getName() + "$InvokeMethodAdvice");
    }
  
    @SuppressWarnings("unused")
    public static class InvokeMethodAdvice {
  
      @Advice.OnMethodEnter(suppress = Throwable.class)
      public static void onEnter(
          @Advice.Argument(1) Class<?> componentClass,
          @Advice.Argument(2) String methodName,
          @Advice.Local("otelRequest") VaadinClientCallableRequest request,
          @Advice.Local("otelContext") Context context,
          @Advice.Local("otelScope") Scope scope) {
  
        Context parentContext = Java8BytecodeBridge.currentContext();
        request = VaadinClientCallableRequest.create(componentClass, methodName);
        if (!clientCallableInstrumenter().shouldStart(parentContext, request)) {
          return;
        }
  
        context = clientCallableInstrumenter().start(parentContext, request);
        scope = context.makeCurrent();
      }
  
      @Advice.OnMethodExit(onThrowable = Throwable.class, suppress = Throwable.class)
      public static void onExit(
          @Advice.Thrown Throwable throwable,
          @Advice.Local("otelRequest") VaadinClientCallableRequest request,
          @Advice.Local("otelContext") Context context,
          @Advice.Local("otelScope") Scope scope) {
        if (scope == null) {
          return;
        }
        scope.close();
  
        clientCallableInstrumenter().end(context, request, null, throwable);
      }
    }
  }
  