add NodeService

src/main/kotlin/ltd/hlaeja/service/NodeService.kt

@@ -0,0 +1,32 @@
+package ltd.hlaeja.service
+
+import java.util.UUID
+import ltd.hlaeja.entity.NodeEntity
+import ltd.hlaeja.repository.NodeRepository
+import mu.KotlinLogging
+import org.springframework.stereotype.Service
+import reactor.core.publisher.Mono
+import org.springframework.http.HttpStatus.NOT_FOUND
+import org.springframework.web.server.ResponseStatusException
+
+private val log = KotlinLogging.logger {}
+
+@Service
+class NodeService(
+    private val repository: NodeRepository,
+) {
+    fun getConfiguration(
+        node: UUID,
+    ): Mono<NodeEntity> = repository.findById(node)
+        .switchIfEmpty(deviceNotFound(node))
+
+    fun updateDevice(
+        nodeEntity: NodeEntity,
+    ): Mono<NodeEntity> = repository.save(nodeEntity)
+
+    private fun deviceNotFound(
+        node: UUID,
+    ): Mono<NodeEntity> = Mono.error(
+        ResponseStatusException(NOT_FOUND, "Node: $node do not exists".also { log.info { it } }),
+    )
+}