content: /*
   * Copyright The OpenTelemetry Authors
   * SPDX-License-Identifier: Apache-2.0
   */
  
  package io.opentelemetry.javaagent.instrumentation.rabbitmq;
  
  import static io.opentelemetry.javaagent.extension.matcher.AgentElementMatchers.hasClassesNamed;
  import static io.opentelemetry.javaagent.extension.matcher.AgentElementMatchers.implementsInterface;
  import static io.opentelemetry.javaagent.instrumentation.rabbitmq.RabbitCommandInstrumentation.SpanHolder.CURRENT_RABBIT_CONTEXT;
  import static io.opentelemetry.javaagent.instrumentation.rabbitmq.RabbitInstrumenterHelper.helper;
  import static io.opentelemetry.javaagent.instrumentation.rabbitmq.RabbitSingletons.channelInstrumenter;
  import static io.opentelemetry.javaagent.instrumentation.rabbitmq.RabbitSingletons.receiveInstrumenter;
  import static net.bytebuddy.matcher.ElementMatchers.canThrow;
  import static net.bytebuddy.matcher.ElementMatchers.isGetter;
  import static net.bytebuddy.matcher.ElementMatchers.isMethod;
  import static net.bytebuddy.matcher.ElementMatchers.isPublic;
  import static net.bytebuddy.matcher.ElementMatchers.isSetter;
  import static net.bytebuddy.matcher.ElementMatchers.nameEndsWith;
  import static net.bytebuddy.matcher.ElementMatchers.named;
  import static net.bytebuddy.matcher.ElementMatchers.namedOneOf;
  import static net.bytebuddy.matcher.ElementMatchers.not;
  import static net.bytebuddy.matcher.ElementMatchers.takesArgument;
  import static net.bytebuddy.matcher.ElementMatchers.takesArguments;
  
  import com.rabbitmq.client.AMQP;
  import com.rabbitmq.client.Channel;
  import com.rabbitmq.client.Consumer;
  import com.rabbitmq.client.GetResponse;
  import com.rabbitmq.client.MessageProperties;
  import io.opentelemetry.api.trace.Span;
  import io.opentelemetry.context.Context;
  import io.opentelemetry.context.Scope;
  import io.opentelemetry.instrumentation.api.internal.InstrumenterUtil;
  import io.opentelemetry.instrumentation.api.internal.Timer;
  import io.opentelemetry.javaagent.bootstrap.CallDepth;
  import io.opentelemetry.javaagent.bootstrap.Java8BytecodeBridge;
  import io.opentelemetry.javaagent.extension.instrumentation.TypeInstrumentation;
  import io.opentelemetry.javaagent.extension.instrumentation.TypeTransformer;
  import io.opentelemetry.semconv.incubating.MessagingIncubatingAttributes;
  import java.io.IOException;
  import java.util.HashMap;
  import java.util.Map;
  import net.bytebuddy.asm.Advice;
  import net.bytebuddy.description.type.TypeDescription;
  import net.bytebuddy.matcher.ElementMatcher;
  
  public class RabbitChannelInstrumentation implements TypeInstrumentation {
  
    @Override
    public ElementMatcher<ClassLoader> classLoaderOptimization() {
      return hasClassesNamed("com.rabbitmq.client.Channel");
    }
  
    @Override
    public ElementMatcher<TypeDescription> typeMatcher() {
      return implementsInterface(named("com.rabbitmq.client.Channel"))
          // broken implementation that throws UnsupportedOperationException on getConnection() calls
          .and(not(named("reactor.rabbitmq.ChannelProxy")));
    }
  
    @Override
    public void transform(TypeTransformer transformer) {
      // these transformations need to be applied in a specific order
      transformer.applyAdviceToMethod(
          isMethod()
              .and(
                  not(
                      isGetter()
                          .or(isSetter())
                          .or(nameEndsWith("Listener"))
                          .or(nameEndsWith("Listeners"))
                          .or(namedOneOf("processAsync", "open", "close", "abort", "basicGet"))))
              .and(isPublic())
              .and(canThrow(IOException.class).or(canThrow(InterruptedException.class))),
          RabbitChannelInstrumentation.class.getName() + "$ChannelMethodAdvice");
      transformer.applyAdviceToMethod(
          isMethod().and(named("basicPublish")).and(takesArguments(6)),
          RabbitChannelInstrumentation.class.getName() + "$ChannelPublishAdvice");
      transformer.applyAdviceToMethod(
          isMethod().and(named("basicGet")).and(takesArgument(0, String.class)),
          RabbitChannelInstrumentation.class.getName() + "$ChannelGetAdvice");
      transformer.applyAdviceToMethod(
          isMethod()
              .and(named("basicConsume"))
              .and(takesArgument(0, String.class))
              .and(takesArgument(6, named("com.rabbitmq.client.Consumer"))),
          RabbitChannelInstrumentation.class.getName() + "$ChannelConsumeAdvice");
    }
  
    // TODO Why do we start span here and not in ChannelPublishAdvice below?
    @SuppressWarnings("unused")
    public static class ChannelMethodAdvice {
  
      @Advice.OnMethodEnter
      public static void onEnter(
          @Advice.This Channel channel,
          @Advice.Origin("Channel.#m") String method,
          @Advice.Local("otelCallDepth") CallDepth callDepth,
          @Advice.Local("otelContext") Context context,
          @Advice.Local("otelScope") Scope scope,
          @Advice.Local("otelRequest") ChannelAndMethod request) {
        callDepth = CallDepth.forClass(Channel.class);
        if (callDepth.getAndIncrement() > 0) {
          return;
        }
  
        Context parentContext = Java8BytecodeBridge.currentContext();
        request = ChannelAndMethod.create(channel, method);
  
        if (!channelInstrumenter(request).shouldStart(parentContext, request)) {
          return;
        }
  
        context = channelInstrumenter(request).start(parentContext, request);
        CURRENT_RABBIT_CONTEXT.set(context);
        helper().setChannelAndMethod(context, request);
        scope = context.makeCurrent();
      }
  
      @Advice.OnMethodExit(onThrowable = Throwable.class, suppress = Throwable.class)
      public static void stopSpan(
          @Advice.Thrown Throwable throwable,
          @Advice.Local("otelCallDepth") CallDepth callDepth,
          @Advice.Local("otelContext") Context context,
          @Advice.Local("otelScope") Scope scope,
          @Advice.Local("otelRequest") ChannelAndMethod request) {
        if (callDepth.decrementAndGet() > 0) {
          return;
        }
        if (scope == null) {
          return;
        }
  
        scope.close();
  
        CURRENT_RABBIT_CONTEXT.remove();
        channelInstrumenter(request).end(context, request, null, throwable);
      }
    }
  
    @SuppressWarnings("unused")
    public static class ChannelPublishAdvice {
  
      @Advice.OnMethodEnter(suppress = Throwable.class)
      public static void setSpanNameAddHeaders(
          @Advice.Argument(0) String exchange,
          @Advice.Argument(1) String routingKey,
          @Advice.Argument(value = 4, readOnly = false) AMQP.BasicProperties props,
          @Advice.Argument(5) byte[] body) {
        Context context = Java8BytecodeBridge.currentContext();
        Span span = Java8BytecodeBridge.spanFromContext(context);
  
        if (span.getSpanContext().isValid()) {
          helper().onPublish(span, exchange, routingKey);
          if (body != null) {
            span.setAttribute(
                MessagingIncubatingAttributes.MESSAGING_MESSAGE_BODY_SIZE, (long) body.length);
          }
  
          // This is the internal behavior when props are null.  We're just doing it earlier now.
          if (props == null) {
            props = MessageProperties.MINIMAL_BASIC;
          }
          helper().onProps(context, span, props);
  
          // We need to copy the BasicProperties and provide a header map we can modify
          Map<String, Object> headers = props.getHeaders();
          headers = (headers == null) ? new HashMap<>() : new HashMap<>(headers);
  
          helper().inject(context, headers, MapSetter.INSTANCE);
  
          props =
              new AMQP.BasicProperties(
                  props.getContentType(),
                  props.getContentEncoding(),
                  headers,
                  props.getDeliveryMode(),
                  props.getPriority(),
                  props.getCorrelationId(),
                  props.getReplyTo(),
                  props.getExpiration(),
                  props.getMessageId(),
                  props.getTimestamp(),
                  props.getType(),
                  props.getUserId(),
                  props.getAppId(),
                  props.getClusterId());
        }
      }
    }
  
    @SuppressWarnings("unused")
    public static class ChannelGetAdvice {
  
      @Advice.OnMethodEnter
      public static void takeTimestamp(
          @Advice.Local("otelCallDepth") CallDepth callDepth,
          @Advice.Local("otelTimer") Timer timer) {
        callDepth = CallDepth.forClass(Channel.class);
        callDepth.getAndIncrement();
        timer = Timer.start();
      }
  
      @Advice.OnMethodExit(onThrowable = Throwable.class, suppress = Throwable.class)
      public static void extractAndStartSpan(
          @Advice.This Channel channel,
          @Advice.Argument(0) String queue,
          @Advice.Return GetResponse response,
          @Advice.Thrown Throwable throwable,
          @Advice.Local("otelCallDepth") CallDepth callDepth,
          @Advice.Local("otelTimer") Timer timer) {
        if (callDepth.decrementAndGet() > 0) {
          return;
        }
  
        Context parentContext = Java8BytecodeBridge.currentContext();
        ReceiveRequest request = ReceiveRequest.create(queue, response, channel.getConnection());
        if (!receiveInstrumenter().shouldStart(parentContext, request)) {
          return;
        }
  
        // can't create span and put into scope in method enter above, because can't add parent after
        // span creation
        InstrumenterUtil.startAndEnd(
            receiveInstrumenter(),
            parentContext,
            request,
            null,
            throwable,
            timer.startTime(),
            timer.now());
      }
    }
  
    @SuppressWarnings("unused")
    public static class ChannelConsumeAdvice {
  
      @Advice.OnMethodEnter(suppress = Throwable.class)
      public static void wrapConsumer(
          @Advice.This Channel channel,
          @Advice.Argument(0) String queue,
          @Advice.Argument(value = 6, readOnly = false) Consumer consumer) {
        // We have to save off the queue name here because it isn't available to the consumer later.
        if (consumer != null && !(consumer instanceof TracedDelegatingConsumer)) {
          consumer = new TracedDelegatingConsumer(queue, consumer, channel.getConnection());
        }
      }
    }
  }
  