add MeasurementService

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

@@ -0,0 +1,52 @@
+package ltd.hlaeja.service
+
+import com.influxdb.client.write.Point
+import java.util.UUID
+import ltd.hlaeja.library.deviceData.MeasurementData
+import ltd.hlaeja.repository.MeasurementRepository
+import org.springframework.http.HttpStatus.NOT_FOUND
+import org.springframework.stereotype.Service
+import org.springframework.web.server.ResponseStatusException
+
+@Service
+class MeasurementService(
+    private val repository: MeasurementRepository,
+) {
+
+    suspend fun getNodeMeasurement(
+        client: UUID,
+        node: UUID,
+    ): MeasurementData.Response {
+        val result = repository.getByNode(client, node)
+        if (result.isEmpty()) {
+            throw ResponseStatusException(NOT_FOUND, "No data for client: $client, device: $node")
+        }
+        val latestData = mutableMapOf<String, Number>()
+        result.forEach { table ->
+            table.records.forEach { record ->
+                latestData[record.getValueByKey("_field") as String] = record.value as Number
+            }
+        }
+        return MeasurementData.Response(latestData)
+    }
+
+    suspend fun addMeasurement(
+        client: UUID,
+        request: MeasurementData.Request,
+    ) = Point.measurement(client.toString())
+        .also { point ->
+            addTags(request.tags, point)
+            addFields(request.fields, point)
+        }
+        .let { point -> repository.save(point) }
+
+    private suspend fun addFields(
+        measurements: Map<String, Number>,
+        point: Point,
+    ) = measurements.forEach { (key, value) -> point.addField(key, value) }
+
+    private suspend fun addTags(
+        measurements: Map<String, String>,
+        point: Point,
+    ) = measurements.forEach { (key, value) -> point.addTag(key, value) }
+}