Don't create observationCoroutineGrpcServerInterceptor bean when micrometer context-propagation isn't present on classpath

Signed-off-by: Alexey Genus <genus.alexey@gmail.com>

Author: genuss

spring-grpc-server-spring-boot-autoconfigure/pom.xml

@@ -142,6 +142,11 @@
 			<artifactId>micrometer-core</artifactId>
 			<optional>true</optional>
 		</dependency>
+		<dependency>
+			<groupId>io.micrometer</groupId>
+			<artifactId>context-propagation</artifactId>
+			<optional>true</optional>
+		</dependency>
 		<dependency>
 			<groupId>io.netty</groupId>
 			<artifactId>netty-transport-native-epoll</artifactId>

spring-grpc-server-spring-boot-autoconfigure/src/main/java/org/springframework/boot/grpc/server/autoconfigure/GrpcServerObservationAutoConfiguration.java

@@ -53,7 +53,7 @@ ObservationGrpcServerInterceptor observationGrpcServerInterceptor(ObservationReg
 	}
 
 	@Configuration(proxyBeanMethods = false)
-	@ConditionalOnClass(name = "io.grpc.kotlin.AbstractCoroutineStub")
+	@ConditionalOnClass(name = { "io.grpc.kotlin.AbstractCoroutineStub", "io.micrometer.context.ContextRegistry" })
 	static class GrpcServerCoroutineStubConfiguration {
 
 		@Bean

spring-grpc-server-spring-boot-autoconfigure/src/test/java/org/springframework/boot/grpc/server/autoconfigure/GrpcServerObservationAutoConfigurationTests.java

@@ -33,7 +33,9 @@
 
 import io.grpc.BindableService;
 import io.grpc.ServerInterceptor;
+import io.micrometer.context.ContextRegistry;
 import io.micrometer.core.instrument.binder.grpc.ObservationGrpcServerInterceptor;
+import io.micrometer.core.instrument.kotlin.ObservationCoroutineContextServerInterceptor;
 import io.micrometer.observation.ObservationRegistry;
 
 /**
@@ -131,4 +133,12 @@ void whenAllConditionsAreMetThenInterceptorConfiguredAsExpected() {
 				}, "Two global interceptors expected")));
 	}
 
+	@Test
+	void whenMicrometerContextPropagationIsNotOnClasspathCoroutineInterceptorIsNotCreated() {
+		this.validContextRunner()
+			.withClassLoader(new FilteredClassLoader(ContextRegistry.class))
+			.run((context) -> assertThat(context).hasSingleBean(ObservationGrpcServerInterceptor.class)
+				.doesNotHaveBean(ObservationCoroutineContextServerInterceptor.class));
+	}
+
 }