content: /*
   * Copyright The OpenTelemetry Authors
   * SPDX-License-Identifier: Apache-2.0
   */
  
  package io.opentelemetry.javaagent.instrumentation.grizzly;
  
  import static io.opentelemetry.javaagent.instrumentation.grizzly.GrizzlySingletons.instrumenter;
  import static net.bytebuddy.matcher.ElementMatchers.isPublic;
  import static net.bytebuddy.matcher.ElementMatchers.named;
  import static net.bytebuddy.matcher.ElementMatchers.namedOneOf;
  import static net.bytebuddy.matcher.ElementMatchers.takesArgument;
  
  import io.opentelemetry.context.Context;
  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 org.glassfish.grizzly.filterchain.FilterChainContext;
  import org.glassfish.grizzly.http.HttpRequestPacket;
  
  public class HttpCodecFilterInstrumentation implements TypeInstrumentation {
  
    @Override
    public ElementMatcher<TypeDescription> typeMatcher() {
      return named("org.glassfish.grizzly.http.HttpCodecFilter");
    }
  
    @Override
    public void transform(TypeTransformer transformer) {
      transformer.applyAdviceToMethod(
          named("handleRead")
              .and(takesArgument(0, named("org.glassfish.grizzly.filterchain.FilterChainContext")))
              .and(
                  takesArgument(
                      1,
                      // this is for 2.3.20+
                      namedOneOf(
                          "org.glassfish.grizzly.http.HttpHeader",
                          // this is for 2.3 through 2.3.19
                          "org.glassfish.grizzly.http.HttpPacketParsing")))
              .and(isPublic()),
          HttpCodecFilterInstrumentation.class.getName() + "$HandleReadAdvice");
    }
  
    @SuppressWarnings("unused")
    public static class HandleReadAdvice {
  
      @Advice.OnMethodExit(onThrowable = Throwable.class, suppress = Throwable.class)
      public static void onExit(
          @Advice.Argument(0) FilterChainContext ctx, @Advice.Argument(1) Object httpHeader) {
  
        Context parentContext = GrizzlyStateStorage.getContext(ctx);
        if (parentContext == null) {
          parentContext = Java8BytecodeBridge.currentContext();
        }
  
        // don't create a span if the request hasn't been parsed yet
        if (!(httpHeader instanceof HttpRequestPacket)) {
          return;
        }
  
        HttpRequestPacket httpRequest = (HttpRequestPacket) httpHeader;
        if (!instrumenter().shouldStart(parentContext, httpRequest)) {
          return;
        }
  
        // We don't want to attach the new context to this thread, as actual request will continue on
        // some other thread where we will read and attach it via GrizzlyStateStorage.
        Context context = instrumenter().start(parentContext, httpRequest);
        GrizzlyStateStorage.attachContextAndRequest(ctx, context, httpRequest);
      }
    }
  }
  