content: /*
   * Copyright The OpenTelemetry Authors
   * SPDX-License-Identifier: Apache-2.0
   */
  
  package io.opentelemetry.javaagent.instrumentation.grails;
  
  import static io.opentelemetry.javaagent.instrumentation.grails.GrailsSingletons.instrumenter;
  import static net.bytebuddy.matcher.ElementMatchers.isMethod;
  import static net.bytebuddy.matcher.ElementMatchers.isPublic;
  import static net.bytebuddy.matcher.ElementMatchers.named;
  import static net.bytebuddy.matcher.ElementMatchers.takesArgument;
  import static net.bytebuddy.matcher.ElementMatchers.takesArguments;
  
  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;
  
  public class DefaultGrailsControllerClassInstrumentation implements TypeInstrumentation {
    @Override
    public ElementMatcher<TypeDescription> typeMatcher() {
      return named("org.grails.core.DefaultGrailsControllerClass");
    }
  
    @Override
    public void transform(TypeTransformer transformer) {
      transformer.applyAdviceToMethod(
          isMethod()
              .and(isPublic())
              .and(named("invoke"))
              .and(takesArgument(0, named(Object.class.getName())))
              .and(takesArgument(1, named(String.class.getName())))
              .and(takesArguments(2)),
          DefaultGrailsControllerClassInstrumentation.class.getName() + "$ControllerAdvice");
    }
  
    @SuppressWarnings("unused")
    public static class ControllerAdvice {
  
      @Advice.OnMethodEnter(suppress = Throwable.class)
      public static void startSpan(
          @Advice.Argument(0) Object controller,
          @Advice.Argument(1) String action,
          @Advice.FieldValue("defaultActionName") String defaultActionName,
          @Advice.Local("otelHandlerData") HandlerData handlerData,
          @Advice.Local("otelContext") Context context,
          @Advice.Local("otelScope") Scope scope) {
  
        Context parentContext = Java8BytecodeBridge.currentContext();
        handlerData = new HandlerData(controller, action != null ? action : defaultActionName);
        if (!instrumenter().shouldStart(parentContext, handlerData)) {
          return;
        }
  
        context = instrumenter().start(parentContext, handlerData);
        scope = context.makeCurrent();
      }
  
      @Advice.OnMethodExit(onThrowable = Throwable.class, suppress = Throwable.class)
      public static void stopSpan(
          @Advice.Thrown Throwable throwable,
          @Advice.Local("otelHandlerData") HandlerData handlerData,
          @Advice.Local("otelContext") Context context,
          @Advice.Local("otelScope") Scope scope) {
        if (scope == null) {
          return;
        }
        scope.close();
        instrumenter().end(context, handlerData, null, throwable);
      }
    }
  }
  