content: /*
   * Copyright The OpenTelemetry Authors
   * SPDX-License-Identifier: Apache-2.0
   */
  
  package io.opentelemetry.javaagent.instrumentation.okhttp.v3_0;
  
  import static net.bytebuddy.matcher.ElementMatchers.isConstructor;
  import static net.bytebuddy.matcher.ElementMatchers.named;
  
  import io.opentelemetry.javaagent.bootstrap.CallDepth;
  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.OkHttpClient;
  
  public class OkHttp3Instrumentation implements TypeInstrumentation {
    @Override
    public ElementMatcher<TypeDescription> typeMatcher() {
      return named("okhttp3.OkHttpClient$Builder");
    }
  
    @Override
    public void transform(TypeTransformer transformer) {
      transformer.applyAdviceToMethod(
          isConstructor(), this.getClass().getName() + "$ConstructorAdvice");
    }
  
    @SuppressWarnings("unused")
    public static class ConstructorAdvice {
  
      @Advice.OnMethodEnter(suppress = Throwable.class)
      public static void trackCallDepth(@Advice.Local("otelCallDepth") CallDepth callDepth) {
        callDepth = CallDepth.forClass(OkHttpClient.Builder.class);
        callDepth.getAndIncrement();
      }
  
      @Advice.OnMethodExit(suppress = Throwable.class)
      public static void addTracingInterceptor(
          @Advice.This OkHttpClient.Builder builder,
          @Advice.Local("otelCallDepth") CallDepth callDepth) {
        // No-args constructor is automatically called by constructors with args, but we only want to
        // run once from the constructor with args because that is where the dedupe needs to happen.
        if (callDepth.decrementAndGet() > 0) {
          return;
        }
        if (!builder.interceptors().contains(OkHttp3Singletons.CONTEXT_INTERCEPTOR)) {
          builder.interceptors().add(0, OkHttp3Singletons.CONTEXT_INTERCEPTOR);
          builder.interceptors().add(1, OkHttp3Singletons.CONNECTION_ERROR_INTERCEPTOR);
        }
        if (!builder.networkInterceptors().contains(OkHttp3Singletons.TRACING_INTERCEPTOR)) {
          builder.addNetworkInterceptor(OkHttp3Singletons.TRACING_INTERCEPTOR);
        }
      }
    }
  }
  