add getNodeFromDevice to NodeService

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

@@ -1,9 +1,12 @@
 package ltd.hlaeja.service
 
+import java.util.UUID
 import ltd.hlaeja.entity.NodeEntity
 import ltd.hlaeja.repository.NodeRepository
 import mu.KotlinLogging
+import org.springframework.http.HttpStatus.NOT_FOUND
 import org.springframework.stereotype.Service
+import org.springframework.web.server.ResponseStatusException
 
 private val log = KotlinLogging.logger {}
 
@@ -16,4 +19,9 @@ class NodeService(
         node: NodeEntity,
     ): NodeEntity = nodeRepository.save(node)
         .also { log.debug { "Added node ${it.id}" } }
+
+    suspend fun getNodeFromDevice(
+        device: UUID,
+    ): NodeEntity = nodeRepository.findByDevice(device)
+        ?: throw ResponseStatusException(NOT_FOUND)
 }