content: /*
   * Copyright The OpenTelemetry Authors
   * SPDX-License-Identifier: Apache-2.0
   */
  
  package io.opentelemetry.javaagent.instrumentation.ratpack;
  
  import static io.opentelemetry.javaagent.extension.matcher.AgentElementMatchers.hasClassesNamed;
  import static io.opentelemetry.javaagent.extension.matcher.AgentElementMatchers.implementsInterface;
  import static net.bytebuddy.matcher.ElementMatchers.isAbstract;
  import static net.bytebuddy.matcher.ElementMatchers.named;
  import static net.bytebuddy.matcher.ElementMatchers.not;
  import static net.bytebuddy.matcher.ElementMatchers.takesArgument;
  
  import io.opentelemetry.javaagent.extension.instrumentation.TypeInstrumentation;
  import io.opentelemetry.javaagent.extension.instrumentation.TypeTransformer;
  import java.util.Optional;
  import net.bytebuddy.asm.Advice;
  import net.bytebuddy.description.type.TypeDescription;
  import net.bytebuddy.matcher.ElementMatcher;
  import ratpack.handling.Context;
  
  public class ServerErrorHandlerInstrumentation implements TypeInstrumentation {
  
    @Override
    public ElementMatcher<ClassLoader> classLoaderOptimization() {
      return hasClassesNamed("ratpack.error.ServerErrorHandler");
    }
  
    @Override
    public ElementMatcher<TypeDescription> typeMatcher() {
      return not(isAbstract()).and(implementsInterface(named("ratpack.error.ServerErrorHandler")));
    }
  
    @Override
    public void transform(TypeTransformer transformer) {
      transformer.applyAdviceToMethod(
          named("error")
              .and(takesArgument(0, named("ratpack.handling.Context")))
              .and(takesArgument(1, Throwable.class)),
          ServerErrorHandlerInstrumentation.class.getName() + "$ErrorAdvice");
    }
  
    @SuppressWarnings("unused")
    public static class ErrorAdvice {
  
      @Advice.OnMethodEnter(suppress = Throwable.class)
      public static void captureThrowable(
          @Advice.Argument(0) Context ctx, @Advice.Argument(1) Throwable throwable) {
        Optional<io.opentelemetry.context.Context> otelContext =
            ctx.maybeGet(io.opentelemetry.context.Context.class);
        if (otelContext.isPresent()) {
          RatpackSingletons.onError(otelContext.get(), throwable);
        }
      }
    }
  }
  