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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 io.opentelemetry.javaagent.instrumentation.jaxrs.v3_0.JerseySingletons.instrumenter;

import io.opentelemetry.context.Context;
import io.opentelemetry.context.Scope;
import io.opentelemetry.javaagent.instrumentation.jaxrs.JaxrsConstants;
import jakarta.ws.rs.container.ContainerRequestContext;
import jakarta.ws.rs.container.ResourceInfo;
import jakarta.ws.rs.core.UriInfo;
import java.lang.reflect.Method;
import net.bytebuddy.asm.Advice;
import net.bytebuddy.asm.Advice.Local;

/**
 * Jersey specific context instrumentation.
 *
 * JAX-RS does not define a way to get the matched resource method from the 
 * ContainerRequestContext
 *
 * In the Jersey implementation, UriInfo implements ResourceInfo. The
 * matched resource method can be retrieved from that object
 */
public class JerseyRequestContextInstrumentation extends AbstractRequestContextInstrumentation {
  @Override
  protected String abortAdviceName() {
    return getClass().getName() + "$ContainerRequestContextAdvice";
  }

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

    @Advice.OnMethodEnter(suppress = Throwable.class)
    public static void decorateAbortSpan(
        @Advice.This ContainerRequestContext requestContext,
        @Local("otelHandlerData") Jaxrs3HandlerData handlerData,
        @Local("otelContext") Context context,
        @Local("otelScope") Scope scope) {
      UriInfo uriInfo = requestContext.getUriInfo();

      if (requestContext.getProperty(JaxrsConstants.ABORT_HANDLED) != null
          || !(uriInfo instanceof ResourceInfo)) {
        return;
      }

      ResourceInfo resourceInfo = (ResourceInfo) uriInfo;
      Method method = resourceInfo.getResourceMethod();
      Class resourceClass = resourceInfo.getResourceClass();

      if (resourceClass == null || method == null) {
        return;
      }

      handlerData = new Jaxrs3HandlerData(resourceClass, method);
      context =
          Jaxrs3RequestContextHelper.createOrUpdateAbortSpan(
              instrumenter(), requestContext, handlerData);
      if (context != null) {
        scope = context.makeCurrent();
      }
    }

    @Advice.OnMethodExit(onThrowable = Throwable.class, suppress = Throwable.class)
    public static void stopSpan(
        @Local("otelHandlerData") Jaxrs3HandlerData handlerData,
        @Local("otelContext") Context context,
        @Local("otelScope") Scope scope,
        @Advice.Thrown Throwable throwable) {
      if (scope == null) {
        return;
      }
      scope.close();
      instrumenter().end(context, handlerData, null, throwable);
    }
  }
}