content: /*
   * Copyright The OpenTelemetry Authors
   * SPDX-License-Identifier: Apache-2.0
   */
  
  package io.opentelemetry.javaagent.instrumentation.vaadin;
  
  import static io.opentelemetry.javaagent.extension.matcher.AgentElementMatchers.hasClassesNamed;
  import static io.opentelemetry.javaagent.extension.matcher.AgentElementMatchers.implementsInterface;
  import static io.opentelemetry.javaagent.instrumentation.vaadin.VaadinSingletons.rpcInstrumenter;
  import static net.bytebuddy.matcher.ElementMatchers.named;
  import static net.bytebuddy.matcher.ElementMatchers.takesArgument;
  
  import com.vaadin.flow.server.communication.rpc.RpcInvocationHandler;
  import elemental.json.JsonObject;
  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 span around rpc calls from javascript
  public class RpcInvocationHandlerInstrumentation implements TypeInstrumentation {
  
    @Override
    public ElementMatcher<ClassLoader> classLoaderOptimization() {
      return hasClassesNamed("com.vaadin.flow.server.communication.rpc.RpcInvocationHandler");
    }
  
    @Override
    public ElementMatcher<TypeDescription> typeMatcher() {
      return implementsInterface(
          named("com.vaadin.flow.server.communication.rpc.RpcInvocationHandler"));
    }
  
    @Override
    public void transform(TypeTransformer transformer) {
      transformer.applyAdviceToMethod(
          named("handle")
              .and(takesArgument(0, named("com.vaadin.flow.component.UI")))
              .and(takesArgument(1, named("elemental.json.JsonObject"))),
          this.getClass().getName() + "$HandleAdvice");
    }
  
    @SuppressWarnings("unused")
    public static class HandleAdvice {
  
      @Advice.OnMethodEnter(suppress = Throwable.class)
      public static void onEnter(
          @Advice.This RpcInvocationHandler rpcInvocationHandler,
          @Advice.Origin("#m") String methodName,
          @Advice.Argument(1) JsonObject jsonObject,
          @Advice.Local("otelRequest") VaadinRpcRequest request,
          @Advice.Local("otelContext") Context context,
          @Advice.Local("otelScope") Scope scope) {
  
        Context parentContext = Java8BytecodeBridge.currentContext();
        request = VaadinRpcRequest.create(rpcInvocationHandler, methodName, jsonObject);
        if (!rpcInstrumenter().shouldStart(parentContext, request)) {
          return;
        }
  
        context = rpcInstrumenter().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") VaadinRpcRequest request,
          @Advice.Local("otelContext") Context context,
          @Advice.Local("otelScope") Scope scope) {
        if (scope == null) {
          return;
        }
        scope.close();
  
        rpcInstrumenter().end(context, request, null, throwable);
      }
    }
  }
  