Add some convenience methods to GrpcServiceDiscoverer

spring-grpc-core/src/main/java/org/springframework/grpc/server/service/GrpcServiceDiscoverer.java

@@ -35,4 +35,27 @@ public interface GrpcServiceDiscoverer {
 	 */
 	List<ServerServiceDefinition> findServices();
 
+	/**
+	 * Find gRPC service names.
+	 * @return list of service names - empty when no services available
+	 */
+	default List<String> listServiceNames() {
+		return findServices().stream()
+			.map(ServerServiceDefinition::getServiceDescriptor)
+			.map(descriptor -> descriptor.getName())
+			.toList();
+	}
+
+	/**
+	 * Find gRPC service.
+	 * @param name the service name
+	 * @return a service - null if no service has this name
+	 */
+	default ServerServiceDefinition findService(String name) {
+		return findServices().stream()
+			.filter(service -> service.getServiceDescriptor().getName().equals(name))
+			.findFirst()
+			.orElse(null);
+	}
+
 }

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

@@ -80,12 +80,12 @@ public class GrpcServerFactoryAutoConfiguration {
 		@Bean
 		public ServletRegistrationBean<GrpcServlet> grpcServlet(GrpcServerProperties properties,
 				GrpcServiceDiscoverer discoverer, ServerBuilderCustomizers serverBuilderCustomizers) {
-			List<ServerServiceDefinition> services = discoverer.findServices();
-			List<String> paths = services.stream()
-				.map(service -> "/" + service.getServiceDescriptor().getName() + "/*")
+			List<String> paths = discoverer.listServiceNames()
+				.stream()
+				.map(service -> "/" + service + "/*")
 				.collect(Collectors.toList());
 			ServletServerBuilder servletServerBuilder = new ServletServerBuilder();
-			services.forEach(servletServerBuilder::addService);
+			discoverer.findServices().forEach(servletServerBuilder::addService);
 			PropertyMapper mapper = PropertyMapper.get().alwaysApplyingWhenNonNull();
 			mapper.from(properties.getMaxInboundMessageSize())
 				.asInt(DataSize::toBytes)

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

@@ -107,11 +107,10 @@ public class GrpcServletRequest {
 		}
 
 		private Stream<String> getPatterns(GrpcServiceDiscoverer context) {
-			return context.findServices()
+			return context.listServiceNames()
 				.stream()
-				.filter(service -> !this.exclusions.stream()
-					.anyMatch(type -> type.equals(service.getServiceDescriptor().getName())))
-				.map(service -> "/" + service.getServiceDescriptor().getName() + "/**");
+				.filter(service -> !this.exclusions.stream().anyMatch(type -> type.equals(service)))
+				.map(service -> "/" + service + "/**");
 		}
 
 		@Override