content: /*
   * Copyright The OpenTelemetry Authors
   * SPDX-License-Identifier: Apache-2.0
   */
  
  package io.opentelemetry.javaagent.instrumentation.kubernetesclient;
  
  import static io.opentelemetry.javaagent.bootstrap.Java8BytecodeBridge.currentContext;
  import static io.opentelemetry.javaagent.instrumentation.kubernetesclient.KubernetesClientSingletons.inject;
  import static io.opentelemetry.javaagent.instrumentation.kubernetesclient.KubernetesClientSingletons.instrumenter;
  import static net.bytebuddy.matcher.ElementMatchers.isPublic;
  import static net.bytebuddy.matcher.ElementMatchers.named;
  import static net.bytebuddy.matcher.ElementMatchers.takesArgument;
  import static net.bytebuddy.matcher.ElementMatchers.takesArguments;
  
  import io.kubernetes.client.openapi.ApiCallback;
  import io.kubernetes.client.openapi.ApiException;
  import io.kubernetes.client.openapi.ApiResponse;
  import io.opentelemetry.context.Context;
  import io.opentelemetry.context.Scope;
  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 okhttp3.Call;
  import okhttp3.Request;
  
  public class ApiClientInstrumentation implements TypeInstrumentation {
    @Override
    public ElementMatcher<TypeDescription> typeMatcher() {
      return named("io.kubernetes.client.openapi.ApiClient");
    }
  
    @Override
    public void transform(TypeTransformer transformer) {
      transformer.applyAdviceToMethod(
          isPublic().and(named("buildRequest")).and(takesArguments(10).or(takesArguments(11))),
          this.getClass().getName() + "$BuildRequestAdvice");
      transformer.applyAdviceToMethod(
          isPublic()
              .and(named("execute"))
              .and(takesArguments(2))
              .and(takesArgument(0, named("okhttp3.Call"))),
          this.getClass().getName() + "$ExecuteAdvice");
      transformer.applyAdviceToMethod(
          isPublic()
              .and(named("executeAsync"))
              .and(takesArguments(3))
              .and(takesArgument(0, named("okhttp3.Call")))
              .and(takesArgument(2, named("io.kubernetes.client.openapi.ApiCallback"))),
          this.getClass().getName() + "$ExecuteAsyncAdvice");
    }
  
    @SuppressWarnings("unused")
    public static class BuildRequestAdvice {
  
      @Advice.OnMethodExit(suppress = Throwable.class)
      public static void onExit(@Advice.Return(readOnly = false) Request request) {
        Context parentContext = currentContext();
        if (!instrumenter().shouldStart(parentContext, request)) {
          return;
        }
  
        Context context = instrumenter().start(parentContext, request);
        Scope scope = context.makeCurrent();
        Request.Builder requestWithPropagation = request.newBuilder();
        inject(context, requestWithPropagation);
        request = requestWithPropagation.build();
        CurrentState.set(parentContext, context, scope, request);
      }
    }
  
    @SuppressWarnings("unused")
    public static class ExecuteAdvice {
  
      @Advice.OnMethodExit(suppress = Throwable.class, onThrowable = Throwable.class)
      public static void onExit(
          @Advice.Return ApiResponse<?> response, @Advice.Thrown Throwable throwable) {
        CurrentState currentState = CurrentState.remove();
        if (currentState == null) {
          return;
        }
  
        currentState.getScope().close();
        Context context = currentState.getContext();
        ApiResponse<?> endResponse = response;
        if (response == null && throwable instanceof ApiException) {
          ApiException apiException = (ApiException) throwable;
          endResponse = new ApiResponse<>(apiException.getCode(), apiException.getResponseHeaders());
        }
        instrumenter().end(context, currentState.getRequest(), endResponse, throwable);
      }
    }
  
    @SuppressWarnings("unused")
    public static class ExecuteAsyncAdvice {
  
      @Advice.OnMethodEnter(suppress = Throwable.class)
      public static void onEnter(
          @Advice.Argument(0) Call httpCall,
          @Advice.Argument(value = 2, readOnly = false) ApiCallback<?> callback,
          @Advice.Local("otelContext") Context context,
          @Advice.Local("otelScope") Scope scope,
          @Advice.Local("otelRequest") Request request) {
        CurrentState current = CurrentState.remove();
        if (current == null) {
          return;
        }
  
        context = current.getContext();
        scope = current.getScope();
        request = current.getRequest();
        callback = new TracingApiCallback<>(callback, current.getParentContext(), context, request);
      }
  
      @Advice.OnMethodExit(suppress = Throwable.class, onThrowable = Throwable.class)
      public static void onExit(
          @Advice.Thrown Throwable throwable,
          @Advice.Local("otelContext") Context context,
          @Advice.Local("otelScope") Scope scope,
          @Advice.Local("otelRequest") Request request) {
        if (scope == null) {
          return;
        }
        scope.close();
  
        if (throwable != null) {
          instrumenter().end(context, request, null, throwable);
        }
        // else span will be ended in the TracingApiCallback
      }
    }
  }
  