content: /*
   * Copyright The OpenTelemetry Authors
   * SPDX-License-Identifier: Apache-2.0
   */
  
  package io.opentelemetry.javaagent.instrumentation.lettuce.v5_0;
  
  import static io.opentelemetry.javaagent.bootstrap.Java8BytecodeBridge.currentContext;
  import static io.opentelemetry.javaagent.instrumentation.lettuce.v5_0.LettuceSingletons.connectInstrumenter;
  import static net.bytebuddy.matcher.ElementMatchers.isMethod;
  import static net.bytebuddy.matcher.ElementMatchers.isPrivate;
  import static net.bytebuddy.matcher.ElementMatchers.nameEndsWith;
  import static net.bytebuddy.matcher.ElementMatchers.nameStartsWith;
  import static net.bytebuddy.matcher.ElementMatchers.named;
  import static net.bytebuddy.matcher.ElementMatchers.returns;
  import static net.bytebuddy.matcher.ElementMatchers.takesArgument;
  
  import io.lettuce.core.ConnectionFuture;
  import io.lettuce.core.RedisURI;
  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;
  
  public class LettuceClientInstrumentation implements TypeInstrumentation {
  
    @Override
    public ElementMatcher<TypeDescription> typeMatcher() {
      return named("io.lettuce.core.RedisClient");
    }
  
    @Override
    public void transform(TypeTransformer transformer) {
      transformer.applyAdviceToMethod(
          isMethod()
              .and(isPrivate())
              .and(returns(named("io.lettuce.core.ConnectionFuture")))
              .and(nameStartsWith("connect"))
              .and(nameEndsWith("Async"))
              .and(takesArgument(1, named("io.lettuce.core.RedisURI"))),
          LettuceClientInstrumentation.class.getName() + "$ConnectAdvice");
    }
  
    @SuppressWarnings("unused")
    public static class ConnectAdvice {
  
      @Advice.OnMethodEnter(suppress = Throwable.class)
      public static void onEnter(
          @Advice.Argument(1) RedisURI redisUri,
          @Advice.Local("otelContext") Context context,
          @Advice.Local("otelScope") Scope scope) {
        context = connectInstrumenter().start(currentContext(), redisUri);
        scope = context.makeCurrent();
      }
  
      @Advice.OnMethodExit(onThrowable = Throwable.class, suppress = Throwable.class)
      public static void stopSpan(
          @Advice.Argument(1) RedisURI redisUri,
          @Advice.Thrown Throwable throwable,
          @Advice.Return ConnectionFuture<?> connectionFuture,
          @Advice.Local("otelContext") Context context,
          @Advice.Local("otelScope") Scope scope) {
        scope.close();
  
        if (throwable != null) {
          connectInstrumenter().end(context, redisUri, null, throwable);
          return;
        }
        connectionFuture.handleAsync(new EndConnectAsyncBiFunction<>(context, redisUri));
      }
    }
  }
  