content: /*
   * Copyright The OpenTelemetry Authors
   * SPDX-License-Identifier: Apache-2.0
   */
  
  package io.opentelemetry.javaagent.instrumentation.grizzly;
  
  import static io.opentelemetry.javaagent.extension.matcher.AgentElementMatchers.hasClassesNamed;
  import static net.bytebuddy.matcher.ElementMatchers.hasSuperClass;
  import static net.bytebuddy.matcher.ElementMatchers.isPublic;
  import static net.bytebuddy.matcher.ElementMatchers.named;
  import static net.bytebuddy.matcher.ElementMatchers.not;
  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;
  import net.bytebuddy.matcher.ElementMatchers;
  import org.glassfish.grizzly.filterchain.BaseFilter;
  import org.glassfish.grizzly.filterchain.FilterChainContext;
  
  public class FilterInstrumentation implements TypeInstrumentation {
  
    @Override
    public ElementMatcher<ClassLoader> classLoaderOptimization() {
      return hasClassesNamed("org.glassfish.grizzly.filterchain.BaseFilter");
    }
  
    @Override
    public ElementMatcher<TypeDescription> typeMatcher() {
      return hasSuperClass(named("org.glassfish.grizzly.filterchain.BaseFilter"))
          // HttpCodecFilter is instrumented in the server instrumentation
          .and(not(ElementMatchers.named("org.glassfish.grizzly.http.HttpCodecFilter")))
          .and(not(ElementMatchers.named("org.glassfish.grizzly.http.HttpServerFilter")));
    }
  
    @Override
    public void transform(TypeTransformer transformer) {
      transformer.applyAdviceToMethod(
          named("handleRead")
              .and(takesArgument(0, named("org.glassfish.grizzly.filterchain.FilterChainContext")))
              .and(isPublic()),
          FilterInstrumentation.class.getName() + "$HandleReadAdvice");
    }
  
    @SuppressWarnings("unused")
    public static class HandleReadAdvice {
  
      @Advice.OnMethodEnter(suppress = Throwable.class)
      public static void onEnter(
          @Advice.This BaseFilter it,
          @Advice.Argument(0) FilterChainContext ctx,
          @Advice.Local("otelScope") Scope scope) {
        if (Java8BytecodeBridge.currentSpan().getSpanContext().isValid()) {
          return;
        }
  
        Context context = GrizzlyStateStorage.getContext(ctx);
        if (context != null) {
          scope = context.makeCurrent();
        }
      }
  
      @Advice.OnMethodExit(onThrowable = Throwable.class, suppress = Throwable.class)
      public static void onExit(@Advice.This BaseFilter it, @Advice.Local("otelScope") Scope scope) {
        if (scope != null) {
          scope.close();
        }
      }
    }
  }
  