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Instrumentation of Java libraries using OpenTelemetry.

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/*
 * Copyright The OpenTelemetry Authors
 * SPDX-License-Identifier: Apache-2.0
 */

package io.opentelemetry.javaagent.instrumentation.jaxrs.v3_0;

import static net.bytebuddy.matcher.ElementMatchers.isMethod;
import static net.bytebuddy.matcher.ElementMatchers.named;
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.bootstrap.jaxrs.JaxrsContextPath;
import io.opentelemetry.javaagent.extension.instrumentation.TypeInstrumentation;
import io.opentelemetry.javaagent.extension.instrumentation.TypeTransformer;
import jakarta.servlet.http.HttpServletRequest;
import net.bytebuddy.asm.Advice;
import net.bytebuddy.description.type.TypeDescription;
import net.bytebuddy.matcher.ElementMatcher;

public class JerseyServletContainerInstrumentation implements TypeInstrumentation {

  @Override
  public ElementMatcher typeMatcher() {
    return named("org.glassfish.jersey.servlet.ServletContainer");
  }

  @Override
  public void transform(TypeTransformer transformer) {
    transformer.applyAdviceToMethod(
        isMethod()
            .and(named("service"))
            .and(takesArgument(0, named("jakarta.servlet.http.HttpServletRequest")))
            .and(takesArgument(1, named("jakarta.servlet.http.HttpServletResponse"))),
        JerseyServletContainerInstrumentation.class.getName() + "$ServiceAdvice");
  }

  @SuppressWarnings("unused")
  public static class ServiceAdvice {

    @Advice.OnMethodEnter(suppress = Throwable.class)
    public static void onEnter(
        @Advice.Argument(0) HttpServletRequest httpServletRequest,
        @Advice.Local("otelScope") Scope scope) {
      Context context =
          JaxrsContextPath.init(
              Java8BytecodeBridge.currentContext(), httpServletRequest.getServletPath());
      if (context != null) {
        scope = context.makeCurrent();
      }
    }

    @Advice.OnMethodExit(onThrowable = Throwable.class, suppress = Throwable.class)
    public static void onExit(@Advice.Local("otelScope") Scope scope) {
      if (scope != null) {
        scope.close();
      }
    }
  }
}