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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.netty.v3_8.server;

import io.opentelemetry.api.GlobalOpenTelemetry;
import io.opentelemetry.instrumentation.api.instrumenter.Instrumenter;
import io.opentelemetry.instrumentation.api.instrumenter.InstrumenterBuilder;
import io.opentelemetry.instrumentation.api.instrumenter.http.HttpExperimentalAttributesExtractor;
import io.opentelemetry.instrumentation.api.instrumenter.http.HttpServerAttributesExtractor;
import io.opentelemetry.instrumentation.api.instrumenter.http.HttpServerExperimentalMetrics;
import io.opentelemetry.instrumentation.api.instrumenter.http.HttpServerMetrics;
import io.opentelemetry.instrumentation.api.instrumenter.http.HttpServerRoute;
import io.opentelemetry.instrumentation.api.instrumenter.http.HttpSpanNameExtractor;
import io.opentelemetry.instrumentation.api.instrumenter.http.HttpSpanStatusExtractor;
import io.opentelemetry.instrumentation.netty.common.internal.NettyErrorHolder;
import io.opentelemetry.javaagent.bootstrap.internal.CommonConfig;
import io.opentelemetry.javaagent.instrumentation.netty.v3_8.HttpRequestAndChannel;
import org.jboss.netty.handler.codec.http.HttpResponse;

final class NettyServerSingletons {

  private static final Instrumenter INSTRUMENTER;

  static {
    NettyHttpServerAttributesGetter httpAttributesGetter = new NettyHttpServerAttributesGetter();

    InstrumenterBuilder builder =
        Instrumenter.builder(
                GlobalOpenTelemetry.get(),
                "io.opentelemetry.netty-3.8",
                HttpSpanNameExtractor.builder(httpAttributesGetter)
                    .setKnownMethods(CommonConfig.get().getKnownHttpRequestMethods())
                    .build())
            .setSpanStatusExtractor(HttpSpanStatusExtractor.create(httpAttributesGetter))
            .addAttributesExtractor(
                HttpServerAttributesExtractor.builder(httpAttributesGetter)
                    .setCapturedRequestHeaders(CommonConfig.get().getServerRequestHeaders())
                    .setCapturedResponseHeaders(CommonConfig.get().getServerResponseHeaders())
                    .setKnownMethods(CommonConfig.get().getKnownHttpRequestMethods())
                    .build())
            .addOperationMetrics(HttpServerMetrics.get());
    if (CommonConfig.get().shouldEmitExperimentalHttpServerTelemetry()) {
      builder
          .addAttributesExtractor(HttpExperimentalAttributesExtractor.create(httpAttributesGetter))
          .addOperationMetrics(HttpServerExperimentalMetrics.get());
    }
    INSTRUMENTER =
        builder
            .addContextCustomizer(
                (context, requestAndChannel, startAttributes) -> NettyErrorHolder.init(context))
            .addContextCustomizer(
                HttpServerRoute.builder(httpAttributesGetter)
                    .setKnownMethods(CommonConfig.get().getKnownHttpRequestMethods())
                    .build())
            .buildServerInstrumenter(NettyHeadersGetter.INSTANCE);
  }

  public static Instrumenter instrumenter() {
    return INSTRUMENTER;
  }

  private NettyServerSingletons() {}
}