watchdog-be: 各状態のオブジェクトの数を取得できるように

watch-dog-be/src/main/kotlin/dev/usbharu/unos/watchdog/be/ApiController.kt

@@ -29,6 +29,9 @@ fun Route.api(apiController: ApiController){
             get("/not-good"){
                 call.respond(HttpStatusCode.OK,apiController.getNotGood())
             }
+            get {
+                call.respond(HttpStatusCode.OK,apiController.statusCount())
+            }
         }
     }
 }
@@ -53,4 +56,8 @@ class ApiController(private val metricsRepository: MetricsRepository) {
     fun getNotGood():Flow<Metric>{
         return metricsRepository.findByStatusAndGroupByObjectIdMaxTimestamp(Status.NOT_GOOD)
     }
+
+    suspend fun statusCount():Map<Status,Int>{
+        return metricsRepository.countyGroupByObjectIdMaxTimestamp()
+    }
 }

watch-dog-be/src/main/kotlin/dev/usbharu/unos/watchdog/be/domain/MetricsRepository.kt

@@ -7,4 +7,6 @@ interface MetricsRepository {
     suspend fun save(metric: Metric):Metric
     fun findByObjectId(objectId:String): Flow<Metric>
     fun findByStatusAndGroupByObjectIdMaxTimestamp(status: Status): Flow<Metric>
+
+    suspend fun countyGroupByObjectIdMaxTimestamp():Map<Status,Int>
 }

watch-dog-be/src/main/kotlin/dev/usbharu/unos/watchdog/be/domain/MongoMetricsRepository.kt

@@ -9,7 +9,9 @@ import com.mongodb.kotlin.client.coroutine.MongoDatabase
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.flow.Flow
 import kotlinx.coroutines.flow.flowOn
+import kotlinx.coroutines.flow.toList
 import kotlinx.coroutines.withContext
+import kotlinx.serialization.Serializable
 
 class MongoMetricsRepository(database: MongoDatabase) : MetricsRepository {
 
@@ -29,13 +31,13 @@ class MongoMetricsRepository(database: MongoDatabase) : MetricsRepository {
                 Aggregates.group(
                     "$" + Metric::objectId.name,
                     Accumulators.max(Metric::timestamp.name, "$" + Metric::timestamp.name),
-                    Accumulators.first(Metric::id.name, "\$_id"),
+                    Accumulators.last(Metric::id.name, "\$_id"),
-                    Accumulators.first(Metric::objectId.name, "$" + Metric::objectId.name),
+                    Accumulators.last(Metric::objectId.name, "$" + Metric::objectId.name),
-                    Accumulators.first(Metric::domain.name, "$" + Metric::domain.name),
+                    Accumulators.last(Metric::domain.name, "$" + Metric::domain.name),
-                    Accumulators.first(Metric::status.name, "$" + Metric::status.name),
+                    Accumulators.last(Metric::status.name, "$" + Metric::status.name),
-                    Accumulators.first(Metric::value.name, "$" + Metric::value.name),
+                    Accumulators.last(Metric::value.name, "$" + Metric::value.name),
-                    Accumulators.first(Metric::name.name, "$" + Metric::name.name),
+                    Accumulators.last(Metric::name.name, "$" + Metric::name.name),
-                    Accumulators.first(Metric::message.name,"$"+ Metric::message.name)
+                    Accumulators.last(Metric::message.name, "$" + Metric::message.name)
                 ),
                 Aggregates.project(
                     Projections.fields(
@@ -55,4 +57,27 @@ class MongoMetricsRepository(database: MongoDatabase) : MetricsRepository {
             )
         ).flowOn(Dispatchers.IO)
     }
+
+    override suspend fun countyGroupByObjectIdMaxTimestamp(): Map<Status, Int> {
+        return collection.aggregate<StatusIntMap>(
+            listOf(
+                Aggregates.group(
+                    "$" + Metric::objectId.name,
+                    Accumulators.max(Metric::timestamp.name, "$" + Metric::timestamp.name),
+                    Accumulators.last(Metric::status.name, "$" + Metric::status.name),
+                ),
+                Aggregates.group(
+                    "\$status",
+                    Accumulators.first("status","\$status"),
+                    Accumulators.sum("count", 1)
+                )
+            )
+        ).flowOn(Dispatchers.IO).toList().associate { it.status to it.count }
+    }
+
+    @Serializable
+    data class StatusIntMap(
+        val status: Status,
+        val count: Int
+    )
 }