Add @Withspan functionality using spring-aop (#902)

instrumentation-core/spring/spring-boot-autoconfigure/spring-boot-autoconfigure.gradle

@@ -13,19 +13,22 @@ dependencies {
   implementation group: 'org.springframework.boot', name: 'spring-boot-autoconfigure', version: versions.springboot
   annotationProcessor group: 'org.springframework.boot', name: 'spring-boot-autoconfigure-processor', version: versions.springboot
   implementation group: 'javax.validation', name: 'validation-api', version: '2.0.1.Final'
-
+  
+  compileOnly group: 'org.springframework.boot', name: 'spring-boot-starter-aop', version: versions.springboot
   compileOnly group: 'org.springframework.boot', name: 'spring-boot-starter-web', version: versions.springboot
   compileOnly group: 'org.springframework.boot', name: 'spring-boot-starter-webflux', version: versions.springboot
   implementation project(':instrumentation-core:spring:spring-webmvc-3.1') 
   implementation project(':instrumentation-core:spring:spring-web-3.1')
   implementation project(':instrumentation-core:spring:spring-webflux-5.0')
-
+  
+  compileOnly deps.opentelemetryApiAutoAnnotations
   compileOnly group: 'io.grpc', name: 'grpc-api', version: '1.30.2'
   compileOnly deps.opentelemetryLogging
   compileOnly deps.opentelemetryJaeger
   compileOnly deps.opentelemetryOtlp
   compileOnly deps.opentelemetryZipkin
 
+  testImplementation group: 'org.springframework.boot', name: 'spring-boot-starter-aop', version: versions.springboot
   testImplementation group: 'org.springframework.boot', name: 'spring-boot-starter-webflux', version: versions.springboot
   testImplementation group: 'org.springframework.boot', name: 'spring-boot-starter-web', version: versions.springboot
   testImplementation(group: 'org.springframework.boot', name: 'spring-boot-starter-test', version: versions.springboot) {
@@ -33,6 +36,7 @@ dependencies {
   }
   
   testImplementation deps.opentelemetrySdk
+  testImplementation deps.opentelemetryApiAutoAnnotations
   testImplementation group: 'io.grpc', name: 'grpc-api', version: '1.30.2'
   testImplementation group: 'io.grpc', name: 'grpc-netty-shaded', version: '1.30.2'
   testImplementation deps.opentelemetryLogging

instrumentation-core/spring/spring-boot-autoconfigure/src/main/java/io/opentelemetry/instrumentation/spring/autoconfigure/aspects/TraceAspectAutoConfiguration.java

@@ -0,0 +1,42 @@
+/*
+ * Copyright The OpenTelemetry Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package io.opentelemetry.instrumentation.spring.autoconfigure.aspects;
+
+import io.opentelemetry.extensions.auto.annotations.WithSpan;
+import io.opentelemetry.trace.Tracer;
+import org.aspectj.lang.annotation.Aspect;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
+import org.springframework.boot.context.properties.EnableConfigurationProperties;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+/** Configures {@link WithSpanAspect} to trace bean methods annotated with {@link WithSpan}. */
+@Configuration
+@EnableConfigurationProperties(TraceAspectProperties.class)
+@ConditionalOnProperty(
+    prefix = "opentelemetry.trace.aspects",
+    name = "enabled",
+    matchIfMissing = true)
+@ConditionalOnClass({Aspect.class, WithSpan.class})
+public class TraceAspectAutoConfiguration {
+
+  @Bean
+  public WithSpanAspect withSpanAspect(Tracer tracer) {
+    return new WithSpanAspect(tracer);
+  }
+}

instrumentation-core/spring/spring-boot-autoconfigure/src/main/java/io/opentelemetry/instrumentation/spring/autoconfigure/aspects/TraceAspectProperties.java

@@ -0,0 +1,33 @@
+/*
+ * Copyright The OpenTelemetry Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package io.opentelemetry.instrumentation.spring.autoconfigure.aspects;
+
+import org.springframework.boot.context.properties.ConfigurationProperties;
+
+/** Configuration for enabling tracing aspects. */
+@ConfigurationProperties(prefix = "opentelemetry.trace.aspects")
+public final class TraceAspectProperties {
+  private boolean enabled;
+
+  public boolean isEnabled() {
+    return enabled;
+  }
+
+  public void setEnabled(boolean enabled) {
+    this.enabled = enabled;
+  }
+}

instrumentation-core/spring/spring-boot-autoconfigure/src/main/java/io/opentelemetry/instrumentation/spring/autoconfigure/aspects/WithSpanAspect.java

@@ -0,0 +1,75 @@
+/*
+ * Copyright The OpenTelemetry Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package io.opentelemetry.instrumentation.spring.autoconfigure.aspects;
+
+import io.opentelemetry.context.Scope;
+import io.opentelemetry.extensions.auto.annotations.WithSpan;
+import io.opentelemetry.trace.Span;
+import io.opentelemetry.trace.Status;
+import io.opentelemetry.trace.Tracer;
+import java.lang.reflect.Method;
+import org.aspectj.lang.ProceedingJoinPoint;
+import org.aspectj.lang.annotation.Around;
+import org.aspectj.lang.annotation.Aspect;
+import org.aspectj.lang.reflect.MethodSignature;
+
+/**
+ * Uses Spring-AOP to wrap methods marked by {@link WithSpan} in a {@link
+ * io.opentelemetry.trace.Span}.
+ *
+ * <p>Ensure methods annotated with {@link WithSpan} are implemented on beans managed by the Spring
+ * container.
+ *
+ * <p>Note: This Aspect uses spring-aop to proxy beans. Therefore the {@link WithSpan} annotation
+ * can not be applied to constructors.
+ */
+@Aspect
+public class WithSpanAspect {
+
+  private final Tracer tracer;
+
+  public WithSpanAspect(Tracer tracer) {
+    this.tracer = tracer;
+  }
+
+  @Around("@annotation(io.opentelemetry.extensions.auto.annotations.WithSpan)")
+  public Object traceMethod(ProceedingJoinPoint pjp) throws Throwable {
+    MethodSignature signature = (MethodSignature) pjp.getSignature();
+    Method method = signature.getMethod();
+    WithSpan withSpan = method.getAnnotation(WithSpan.class);
+
+    Span span =
+        tracer.spanBuilder(getSpanName(withSpan, method)).setSpanKind(withSpan.kind()).startSpan();
+    try (Scope scope = tracer.withSpan(span)) {
+      return pjp.proceed();
+    } catch (Throwable t) {
+      span.setStatus(Status.INTERNAL);
+      span.recordException(t);
+      throw t;
+    } finally {
+      span.end();
+    }
+  }
+
+  private String getSpanName(WithSpan withSpan, Method method) {
+    String spanName = withSpan.value();
+    if (spanName.isEmpty()) {
+      return method.getDeclaringClass().getSimpleName() + "." + method.getName();
+    }
+    return spanName;
+  }
+}

instrumentation-core/spring/spring-boot-autoconfigure/src/main/resources/META-INF/spring.factories

@@ -6,4 +6,5 @@ io.opentelemetry.instrumentation.spring.autoconfigure.exporters.logging.LoggingS
 io.opentelemetry.instrumentation.spring.autoconfigure.TracerAutoConfiguration,\
 io.opentelemetry.instrumentation.spring.autoconfigure.httpclients.resttemplate.RestTemplateAutoConfiguration,\
 io.opentelemetry.instrumentation.spring.autoconfigure.httpclients.webclient.WebClientAutoConfiguration,\
-io.opentelemetry.instrumentation.spring.autoconfigure.webmvc.WebMVCFilterAutoConfiguration
+io.opentelemetry.instrumentation.spring.autoconfigure.webmvc.WebMVCFilterAutoConfiguration,\
+io.opentelemetry.instrumentation.spring.autoconfigure.aspects.TraceAspectAutoConfiguration

instrumentation-core/spring/spring-boot-autoconfigure/src/test/java/io/opentelemetry/instrumentation/spring/autoconfigure/aspects/TraceAspectAutoConfigurationTest.java

@@ -0,0 +1,66 @@
+/*
+ * Copyright The OpenTelemetry Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package io.opentelemetry.instrumentation.spring.autoconfigure.aspects;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import io.opentelemetry.instrumentation.spring.autoconfigure.TracerAutoConfiguration;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+import org.springframework.boot.autoconfigure.AutoConfigurations;
+import org.springframework.boot.test.context.runner.ApplicationContextRunner;
+
+/** Spring Boot auto configuration test for {@link TraceAspectAutoConfiguration} */
+public class TraceAspectAutoConfigurationTest {
+
+  private final ApplicationContextRunner contextRunner =
+      new ApplicationContextRunner()
+          .withConfiguration(
+              AutoConfigurations.of(
+                  TracerAutoConfiguration.class, TraceAspectAutoConfiguration.class));
+
+  @Test
+  @DisplayName("when aspects are ENABLED should initialize WithSpanAspect bean")
+  void aspectsEnabled() {
+    this.contextRunner
+        .withPropertyValues("opentelemetry.trace.aspects.enabled=true")
+        .run(
+            (context) -> {
+              assertThat(context.getBean("withSpanAspect", WithSpanAspect.class)).isNotNull();
+            });
+  }
+
+  @Test
+  @DisplayName("when aspects are DISABLED should NOT initialize WithSpanAspect bean")
+  void disabledProperty() {
+    this.contextRunner
+        .withPropertyValues("opentelemetry.trace.aspects.enabled=false")
+        .run(
+            (context) -> {
+              assertThat(context.containsBean("withSpanAspect")).isFalse();
+            });
+  }
+
+  @Test
+  @DisplayName("when aspects enabled property is MISSING should initialize WithSpanAspect bean")
+  void noProperty() {
+    this.contextRunner.run(
+        (context) -> {
+          assertThat(context.getBean("withSpanAspect", WithSpanAspect.class)).isNotNull();
+        });
+  }
+}

instrumentation-core/spring/spring-boot-autoconfigure/src/test/java/io/opentelemetry/instrumentation/spring/autoconfigure/aspects/WithSpanAspectTest.java

@@ -0,0 +1,150 @@
+/*
+ * Copyright The OpenTelemetry Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package io.opentelemetry.instrumentation.spring.autoconfigure.aspects;
+
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
+import static org.mockito.Mockito.any;
+import static org.mockito.Mockito.times;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+import io.opentelemetry.context.Scope;
+import io.opentelemetry.extensions.auto.annotations.WithSpan;
+import io.opentelemetry.trace.Span;
+import io.opentelemetry.trace.Span.Kind;
+import io.opentelemetry.trace.Tracer;
+import org.aspectj.lang.ProceedingJoinPoint;
+import org.aspectj.lang.reflect.MethodSignature;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.mockito.Mock;
+import org.mockito.junit.jupiter.MockitoExtension;
+import org.springframework.aop.aspectj.annotation.AspectJProxyFactory;
+
+/** Spring AOP Test for {@link WithSpanAspect} */
+@ExtendWith(MockitoExtension.class)
+public class WithSpanAspectTest {
+  static class WithSpanTester {
+    @WithSpan
+    public String testWithSpan() {
+      return "Span with name testWithSpan was created";
+    }
+
+    @WithSpan("greatestSpanEver")
+    public String testWithSpanWithValue() {
+      return "Span with name greatestSpanEver was created";
+    }
+
+    @WithSpan(kind = Kind.CLIENT)
+    public String testWithSpanWithKind() {
+      return "Span with name testWithSpanWithKind and Kind.CLIENT was created";
+    }
+
+    @WithSpan
+    public String testWithSpanWithException() throws Exception {
+      throw new Exception("Test @WithSpan With Exception");
+    }
+  }
+
+  @Mock private Tracer tracer;
+  @Mock private Span span;
+  @Mock private Span.Builder spanBuilder;
+  @Mock private Scope scope;
+  @Mock private ProceedingJoinPoint pjp;
+  @Mock private MethodSignature signature;
+
+  private WithSpanTester withSpanTester;
+
+  @BeforeEach
+  void setup() {
+    when(tracer.spanBuilder(any())).thenReturn(spanBuilder);
+    when(spanBuilder.setSpanKind(any())).thenReturn(spanBuilder);
+    when(spanBuilder.startSpan()).thenReturn(span);
+    when(tracer.withSpan(span)).thenReturn(scope);
+
+    AspectJProxyFactory factory = new AspectJProxyFactory(new WithSpanTester());
+    WithSpanAspect aspect = new WithSpanAspect(tracer);
+    factory.addAspect(aspect);
+
+    withSpanTester = factory.getProxy();
+  }
+
+  @Test
+  @DisplayName("when method is annotated with @WithSpan should wrap method execution in a Span")
+  void withSpan() throws Throwable {
+
+    withSpanTester.testWithSpan();
+
+    verify(tracer, times(1)).spanBuilder("WithSpanTester.testWithSpan");
+    verify(spanBuilder, times(1)).startSpan();
+    verify(span, times(1)).end();
+  }
+
+  @Test
+  @DisplayName(
+      "when @WithSpan value is set should wrap method execution in a Span with custom name")
+  void withSpanName() throws Throwable {
+
+    withSpanTester.testWithSpanWithValue();
+
+    verify(tracer, times(1)).spanBuilder("greatestSpanEver");
+    verify(spanBuilder, times(1)).startSpan();
+    verify(span, times(1)).end();
+  }
+
+  @Test
+  @DisplayName(
+      "when method is annotated with @WithSpan AND an exception is thrown span should record the exception")
+  void withSpanError() throws Throwable {
+
+    assertThatThrownBy(
+            () -> {
+              withSpanTester.testWithSpanWithException();
+            })
+        .isInstanceOf(Exception.class);
+
+    verify(spanBuilder, times(1)).startSpan();
+    verify(span, times(1)).recordException(any(Exception.class));
+    verify(span, times(1)).end();
+  }
+
+  @Test
+  @DisplayName(
+      "when method is annotated with @WithSpan AND Span.Kind is missing should set default Kind")
+  void withSpanDefaultKind() throws Throwable {
+
+    withSpanTester.testWithSpan();
+
+    verify(spanBuilder, times(1)).setSpanKind(Kind.INTERNAL);
+    verify(spanBuilder, times(1)).startSpan();
+    verify(span, times(1)).end();
+  }
+
+  @Test
+  @DisplayName(
+      "when method is annotated with @WithSpan AND WithSpan.kind is set should build span with the declared Kind")
+  void withSpanClientKind() throws Throwable {
+
+    withSpanTester.testWithSpanWithKind();
+
+    verify(spanBuilder, times(1)).setSpanKind(Kind.CLIENT);
+    verify(spanBuilder, times(1)).startSpan();
+    verify(span, times(1)).end();
+  }
+}

instrumentation-core/spring/starters/spring-starter/spring-starter.gradle

@@ -11,7 +11,9 @@ sourceCompatibility = '8'
 
 dependencies { 
   api group: "org.springframework.boot", name: "spring-boot-starter", version: versions.springboot
+  api group: 'org.springframework.boot', name: 'spring-boot-starter-aop', version: versions.springboot
   api project(':instrumentation-core:spring:spring-boot-autoconfigure')
+  api deps.opentelemetryApiAutoAnnotations
   api deps.opentelemetryApi
   api deps.opentelemetryLogging
   api deps.opentelemetrySdk