Split Webflux into client and server

instrumentation/spring/spring-boot-autoconfigure/src/main/java/io/opentelemetry/instrumentation/spring/autoconfigure/internal/instrumentation/webflux/SpringWebfluxInstrumentationAutoConfiguration.java

@@ -40,7 +40,7 @@ static WebClientBeanPostProcessor otelWebClientBeanPostProcessor(
 
   @Bean
   WebFilter telemetryFilter(OpenTelemetry openTelemetry, ConfigProperties config) {
-    return WebClientBeanPostProcessor.getWebfluxTelemetry(openTelemetry, config)
+    return WebClientBeanPostProcessor.getWebfluxServerTelemetry(openTelemetry, config)
         .createWebFilterAndRegisterReactorHook();
   }
 }

instrumentation/spring/spring-boot-autoconfigure/src/main/java/io/opentelemetry/instrumentation/spring/autoconfigure/internal/instrumentation/webflux/WebClientBeanPostProcessor.java

@@ -7,7 +7,8 @@
 
 import io.opentelemetry.api.OpenTelemetry;
 import io.opentelemetry.instrumentation.spring.autoconfigure.internal.properties.InstrumentationConfigUtil;
-import io.opentelemetry.instrumentation.spring.webflux.v5_3.SpringWebfluxTelemetry;
+import io.opentelemetry.instrumentation.spring.webflux.v5_3.SpringWebfluxClientTelemetry;
+import io.opentelemetry.instrumentation.spring.webflux.v5_3.SpringWebfluxServerTelemetry;
 import io.opentelemetry.instrumentation.spring.webflux.v5_3.internal.SpringWebfluxBuilderUtil;
 import io.opentelemetry.sdk.autoconfigure.spi.ConfigProperties;
 import org.springframework.beans.factory.ObjectProvider;
@@ -31,12 +32,20 @@ final class WebClientBeanPostProcessor implements BeanPostProcessor {
     this.configPropertiesProvider = configPropertiesProvider;
   }
 
-  static SpringWebfluxTelemetry getWebfluxTelemetry(
+  static SpringWebfluxClientTelemetry getWebfluxClientTelemetry(
       OpenTelemetry openTelemetry, ConfigProperties config) {
-    return InstrumentationConfigUtil.configureClientAndServerBuilder(
+    return InstrumentationConfigUtil.configureClientBuilder(
             config,
-            SpringWebfluxTelemetry.builder(openTelemetry),
-            SpringWebfluxBuilderUtil.getClientBuilderExtractor(),
+            SpringWebfluxClientTelemetry.builder(openTelemetry),
+            SpringWebfluxBuilderUtil.getClientBuilderExtractor())
+        .build();
+  }
+
+  static SpringWebfluxServerTelemetry getWebfluxServerTelemetry(
+      OpenTelemetry openTelemetry, ConfigProperties config) {
+    return InstrumentationConfigUtil.configureServerBuilder(
+            config,
+            SpringWebfluxServerTelemetry.builder(openTelemetry),
             SpringWebfluxBuilderUtil.getServerBuilderExtractor())
         .build();
   }
@@ -54,9 +63,9 @@ public Object postProcessAfterInitialization(Object bean, String beanName) {
   }
 
   private WebClient.Builder wrapBuilder(WebClient.Builder webClientBuilder) {
-    SpringWebfluxTelemetry instrumentation =
-        getWebfluxTelemetry(
+    SpringWebfluxClientTelemetry instrumentation =
+        getWebfluxClientTelemetry(
             openTelemetryProvider.getObject(), configPropertiesProvider.getObject());
-    return webClientBuilder.filters(instrumentation::addClientTracingFilter);
+    return webClientBuilder.filters(instrumentation::addTracingFilter);
   }
 }

instrumentation/spring/spring-boot-autoconfigure/src/main/java/io/opentelemetry/instrumentation/spring/autoconfigure/internal/properties/InstrumentationConfigUtil.java

@@ -19,21 +19,6 @@
 public final class InstrumentationConfigUtil {
   private InstrumentationConfigUtil() {}
 
-  @CanIgnoreReturnValue
-  public static <T, CLIENTREQUEST, CLIENTRESPONSE, SERVERREQUEST, SERVERRESPONSE>
-      T configureClientAndServerBuilder(
-          ConfigProperties config,
-          T builder,
-          Function<T, DefaultHttpClientInstrumenterBuilder<CLIENTREQUEST, CLIENTRESPONSE>>
-              getClientBuilder,
-          Function<T, DefaultHttpServerInstrumenterBuilder<SERVERREQUEST, SERVERRESPONSE>>
-              getServerBuilder) {
-    CommonConfig commonConfig = getConfig(config);
-    getClientBuilder.apply(builder).configure(commonConfig);
-    getServerBuilder.apply(builder).configure(commonConfig);
-    return builder;
-  }
-
   @CanIgnoreReturnValue
   public static <T, REQUEST, RESPONSE> T configureClientBuilder(
       ConfigProperties config,

instrumentation/spring/spring-webflux/spring-webflux-5.3/library/src/main/java/io/opentelemetry/instrumentation/spring/webflux/v5_3/SpringWebfluxClientTelemetry.java

@@ -0,0 +1,54 @@
+/*
+ * Copyright The OpenTelemetry Authors
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+package io.opentelemetry.instrumentation.spring.webflux.v5_3;
+
+import io.opentelemetry.api.OpenTelemetry;
+import io.opentelemetry.context.propagation.ContextPropagators;
+import io.opentelemetry.instrumentation.api.instrumenter.Instrumenter;
+import io.opentelemetry.instrumentation.spring.webflux.v5_3.internal.WebClientTracingFilter;
+import java.util.List;
+import org.springframework.web.reactive.function.client.ClientRequest;
+import org.springframework.web.reactive.function.client.ClientResponse;
+import org.springframework.web.reactive.function.client.ExchangeFilterFunction;
+
+/** Entrypoint for instrumenting Spring Webflux HTTP clients. */
+public final class SpringWebfluxClientTelemetry {
+
+  /**
+   * Returns a new {@link SpringWebfluxClientTelemetry} configured with the given {@link
+   * OpenTelemetry}.
+   */
+  public static SpringWebfluxClientTelemetry create(OpenTelemetry openTelemetry) {
+    return builder(openTelemetry).build();
+  }
+
+  /**
+   * Returns a new {@link SpringWebfluxClientTelemetryBuilder} configured with the given {@link
+   * OpenTelemetry}.
+   */
+  public static SpringWebfluxClientTelemetryBuilder builder(OpenTelemetry openTelemetry) {
+    return new SpringWebfluxClientTelemetryBuilder(openTelemetry);
+  }
+
+  private final Instrumenter<ClientRequest, ClientResponse> clientInstrumenter;
+  private final ContextPropagators propagators;
+
+  SpringWebfluxClientTelemetry(
+      Instrumenter<ClientRequest, ClientResponse> clientInstrumenter,
+      ContextPropagators propagators) {
+    this.clientInstrumenter = clientInstrumenter;
+    this.propagators = propagators;
+  }
+
+  public void addTracingFilter(List<ExchangeFilterFunction> exchangeFilterFunctions) {
+    for (ExchangeFilterFunction filterFunction : exchangeFilterFunctions) {
+      if (filterFunction instanceof WebClientTracingFilter) {
+        return;
+      }
+    }
+    exchangeFilterFunctions.add(new WebClientTracingFilter(clientInstrumenter, propagators));
+  }
+}

instrumentation/spring/spring-webflux/spring-webflux-5.3/library/src/main/java/io/opentelemetry/instrumentation/spring/webflux/v5_3/SpringWebfluxClientTelemetryBuilder.java

@@ -0,0 +1,127 @@
+/*
+ * Copyright The OpenTelemetry Authors
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+package io.opentelemetry.instrumentation.spring.webflux.v5_3;
+
+import com.google.errorprone.annotations.CanIgnoreReturnValue;
+import io.opentelemetry.api.OpenTelemetry;
+import io.opentelemetry.instrumentation.api.incubator.builder.internal.DefaultHttpClientInstrumenterBuilder;
+import io.opentelemetry.instrumentation.api.instrumenter.AttributesExtractor;
+import io.opentelemetry.instrumentation.api.instrumenter.SpanNameExtractor;
+import io.opentelemetry.instrumentation.api.semconv.http.HttpClientAttributesExtractorBuilder;
+import io.opentelemetry.instrumentation.spring.webflux.v5_3.internal.Experimental;
+import io.opentelemetry.instrumentation.spring.webflux.v5_3.internal.SpringWebfluxBuilderUtil;
+import io.opentelemetry.instrumentation.spring.webflux.v5_3.internal.WebClientHttpAttributesGetter;
+import java.util.List;
+import java.util.Set;
+import java.util.function.Function;
+import org.springframework.web.reactive.function.client.ClientRequest;
+import org.springframework.web.reactive.function.client.ClientResponse;
+
+/** A builder of {@link SpringWebfluxClientTelemetry}. */
+public final class SpringWebfluxClientTelemetryBuilder {
+  private static final String INSTRUMENTATION_NAME = "io.opentelemetry.spring-webflux-5.3";
+
+  private final DefaultHttpClientInstrumenterBuilder<ClientRequest, ClientResponse> builder;
+  private final OpenTelemetry openTelemetry;
+
+  static {
+    SpringWebfluxBuilderUtil.setClientBuilderExtractor(
+        SpringWebfluxClientTelemetryBuilder::getBuilder);
+  }
+
+  SpringWebfluxClientTelemetryBuilder(OpenTelemetry openTelemetry) {
+    builder =
+        DefaultHttpClientInstrumenterBuilder.create(
+            INSTRUMENTATION_NAME, openTelemetry, WebClientHttpAttributesGetter.INSTANCE);
+    this.openTelemetry = openTelemetry;
+  }
+
+  /**
+   * Adds an additional {@link AttributesExtractor} to invoke to set attributes to instrumented
+   * items for WebClient.
+   */
+  @CanIgnoreReturnValue
+  public SpringWebfluxClientTelemetryBuilder addAttributesExtractor(
+      AttributesExtractor<ClientRequest, ClientResponse> attributesExtractor) {
+    builder.addAttributeExtractor(attributesExtractor);
+    return this;
+  }
+
+  /**
+   * Configures the HTTP WebClient request headers that will be captured as span attributes.
+   *
+   * @param requestHeaders A list of HTTP header names.
+   */
+  @CanIgnoreReturnValue
+  public SpringWebfluxClientTelemetryBuilder setCapturedRequestHeaders(
+      List<String> requestHeaders) {
+    builder.setCapturedRequestHeaders(requestHeaders);
+    return this;
+  }
+
+  /**
+   * Configures the HTTP WebClient response headers that will be captured as span attributes.
+   *
+   * @param responseHeaders A list of HTTP header names.
+   */
+  @CanIgnoreReturnValue
+  public SpringWebfluxClientTelemetryBuilder setCapturedResponseHeaders(
+      List<String> responseHeaders) {
+    builder.setCapturedResponseHeaders(responseHeaders);
+    return this;
+  }
+
+  /**
+   * Configures the instrumentation to recognize an alternative set of HTTP request methods.
+   *
+   * <p>By default, this instrumentation defines "known" methods as the ones listed in <a
+   * href="https://www.rfc-editor.org/rfc/rfc9110.html#name-methods">RFC9110</a> and the PATCH
+   * method defined in <a href="https://www.rfc-editor.org/rfc/rfc5789.html">RFC5789</a>.
+   *
+   * <p>Note: calling this method <b>overrides</b> the default known method sets completely; it does
+   * not supplement it.
+   *
+   * @param knownMethods A set of recognized HTTP request methods.
+   * @see HttpClientAttributesExtractorBuilder#setKnownMethods(Set)
+   */
+  @CanIgnoreReturnValue
+  public SpringWebfluxClientTelemetryBuilder setKnownMethods(Set<String> knownMethods) {
+    builder.setKnownMethods(knownMethods);
+    return this;
+  }
+
+  /** Sets custom client {@link SpanNameExtractor} via transform function. */
+  @CanIgnoreReturnValue
+  public SpringWebfluxClientTelemetryBuilder setSpanNameExtractor(
+      Function<
+              SpanNameExtractor<? super ClientRequest>,
+              ? extends SpanNameExtractor<? super ClientRequest>>
+          clientSpanNameExtractor) {
+    builder.setSpanNameExtractor(clientSpanNameExtractor);
+    return this;
+  }
+
+  /**
+   * Can be used via the unstable method {@link
+   * Experimental#setEmitExperimentalHttpClientMetrics(SpringWebfluxClientTelemetryBuilder,
+   * boolean)}.
+   */
+  void setEmitExperimentalHttpClientTelemetry(boolean emitExperimentalHttpClientTelemetry) {
+    builder.setEmitExperimentalHttpClientMetrics(emitExperimentalHttpClientTelemetry);
+  }
+
+  /**
+   * Returns a new {@link SpringWebfluxClientTelemetry} with the settings of this {@link
+   * SpringWebfluxClientTelemetryBuilder}.
+   */
+  public SpringWebfluxClientTelemetry build() {
+    return new SpringWebfluxClientTelemetry(builder.build(), openTelemetry.getPropagators());
+  }
+
+  private DefaultHttpClientInstrumenterBuilder<ClientRequest, ClientResponse> getBuilder() {
+    return builder;
+  }
+}

instrumentation/spring/spring-webflux/spring-webflux-5.3/library/src/main/java/io/opentelemetry/instrumentation/spring/webflux/v5_3/SpringWebfluxServerTelemetry.java

@@ -0,0 +1,54 @@
+/*
+ * Copyright The OpenTelemetry Authors
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+package io.opentelemetry.instrumentation.spring.webflux.v5_3;
+
+import io.opentelemetry.api.OpenTelemetry;
+import io.opentelemetry.instrumentation.api.instrumenter.Instrumenter;
+import io.opentelemetry.instrumentation.reactor.v3_1.ContextPropagationOperator;
+import org.springframework.web.server.ServerWebExchange;
+import org.springframework.web.server.WebFilter;
+
+/** Entrypoint for instrumenting Spring Webflux HTTP services. */
+public final class SpringWebfluxServerTelemetry {
+
+  /**
+   * Returns a new {@link SpringWebfluxServerTelemetry} configured with the given {@link
+   * OpenTelemetry}.
+   */
+  public static SpringWebfluxServerTelemetry create(OpenTelemetry openTelemetry) {
+    return builder(openTelemetry).build();
+  }
+
+  /**
+   * Returns a new {@link SpringWebfluxServerTelemetryBuilder} configured with the given {@link
+   * OpenTelemetry}.
+   */
+  public static SpringWebfluxServerTelemetryBuilder builder(OpenTelemetry openTelemetry) {
+    return new SpringWebfluxServerTelemetryBuilder(openTelemetry);
+  }
+
+  // We use ServerWebExchange (which holds both the request and response)
+  // because we need it to get the HTTP route while instrumenting.
+  private final Instrumenter<ServerWebExchange, ServerWebExchange> serverInstrumenter;
+
+  SpringWebfluxServerTelemetry(
+      Instrumenter<ServerWebExchange, ServerWebExchange> serverInstrumenter) {
+    this.serverInstrumenter = serverInstrumenter;
+  }
+
+  public WebFilter createWebFilter() {
+    return new TelemetryProducingWebFilter(serverInstrumenter);
+  }
+
+  public WebFilter createWebFilterAndRegisterReactorHook() {
+    registerReactorHook();
+    return this.createWebFilter();
+  }
+
+  private static void registerReactorHook() {
+    ContextPropagationOperator.builder().build().registerOnEachOperator();
+  }
+}