Handle Ordinis outage in TGU service

Classify Ordinis classifier transport failures and empty responses as unavailable, keep stale platform cache when possible, and expose Prometheus metrics/alerting for the outage signal.

services/pcp-tgu-service/build.gradle.kts

@@ -20,6 +20,7 @@ dependencies {
     // Spring Boot
     implementation("org.springframework.boot:spring-boot-starter-webflux")
     implementation("org.springframework.boot:spring-boot-starter-actuator")
+    runtimeOnly("io.micrometer:micrometer-registry-prometheus")
     implementation("org.springdoc:springdoc-openapi-starter-webflux-ui:3.0.0")
     implementation("org.springframework.boot:spring-boot-starter-data-jpa")
     implementation("org.springframework.boot:spring-boot-starter-flyway")

services/pcp-tgu-service/src/main/kotlin/space/nstart/pcp_tgu_service/integration/api/PlatformsClassifierClient.kt

@@ -5,6 +5,8 @@ import space.nstart.pcp_tgu_service.config.ClassifierProperties
 import space.nstart.pcp_tgu_service.dto.NsiPlatformDto
 import org.springframework.stereotype.Component
 import org.springframework.web.reactive.function.client.WebClient
+import org.springframework.web.reactive.function.client.WebClientException
+import org.springframework.web.reactive.function.client.WebClientResponseException
 
 /**
  * HTTP-клиент для получения списка космических аппаратов из классификатора.
@@ -22,10 +24,33 @@ class PlatformsClassifierClient(
      * Загружает список платформ из классификатора НСИ.
      */
     fun fetchPlatforms(): List<NsiPlatformDto> =
-        webClient.get()
-            .retrieve()
-            .bodyToMono(Array<NsiPlatformDto>::class.java)
-            .map { platforms -> platforms.toList() }
-            .block()
-            ?: throw IllegalStateException("Classifier response body is empty: ${classifierProperties.platformsUrl}")
+        try {
+            val platforms = webClient.get()
+                .retrieve()
+                .bodyToMono(Array<NsiPlatformDto>::class.java)
+                .block()
+
+            platforms?.toList()
+                ?: throw OrdinisUnavailableException(
+                    classifierUrl = classifierProperties.platformsUrl,
+                    statusCode = null,
+                    cause = IllegalStateException("Classifier response body is empty: ${classifierProperties.platformsUrl}")
+                )
+        } catch (ex: WebClientException) {
+            throw OrdinisUnavailableException(
+                classifierUrl = classifierProperties.platformsUrl,
+                statusCode = (ex as? WebClientResponseException)?.statusCode?.value(),
+                cause = ex
+            )
+        }
 }
+
+/**
+ * Семантическая ошибка недоступности Ordinis/НСИ, чтобы service layer мог безопасно
+ * отличить outage внешней зависимости от ошибок маппинга или доменной логики.
+ */
+class OrdinisUnavailableException(
+    val classifierUrl: String,
+    val statusCode: Int?,
+    cause: Throwable
+) : RuntimeException("Ordinis classifier is unavailable: $classifierUrl", cause)

services/pcp-tgu-service/src/main/kotlin/space/nstart/pcp_tgu_service/service/OrdinisAvailabilityMetrics.kt

@@ -0,0 +1,40 @@
+package space.nstart.pcp_tgu_service.service
+
+import io.micrometer.core.instrument.Counter
+import io.micrometer.core.instrument.Gauge
+import io.micrometer.core.instrument.MeterRegistry
+import org.springframework.stereotype.Component
+import java.util.concurrent.atomic.AtomicInteger
+
+/**
+ * Метрики доступности Ordinis/НСИ для alerting по последней попытке синхронизации.
+ */
+@Component
+class OrdinisAvailabilityMetrics(
+    meterRegistry: MeterRegistry
+) {
+    private val unavailableGaugeValue = AtomicInteger(0)
+    private val unavailableCounter = Counter.builder(UNAVAILABLE_TOTAL)
+        .description("Total Ordinis classifier fetch failures detected by pcp-tgu-service")
+        .register(meterRegistry)
+
+    init {
+        Gauge.builder(UNAVAILABLE, unavailableGaugeValue) { value -> value.get().toDouble() }
+            .description("1 when the last Ordinis classifier fetch failed, 0 after a successful fetch")
+            .register(meterRegistry)
+    }
+
+    fun markAvailable() {
+        unavailableGaugeValue.set(0)
+    }
+
+    fun markUnavailable() {
+        unavailableGaugeValue.set(1)
+        unavailableCounter.increment()
+    }
+
+    companion object {
+        const val UNAVAILABLE = "pcp_tgu_ordinis_unavailable"
+        const val UNAVAILABLE_TOTAL = "pcp_tgu_ordinis_unavailable_total"
+    }
+}

services/pcp-tgu-service/src/main/kotlin/space/nstart/pcp_tgu_service/service/PlatformService.kt

@@ -5,6 +5,7 @@ import com.fasterxml.jackson.databind.ObjectMapper
 import space.nstart.pcp_tgu_service.config.ClassifierProperties
 import space.nstart.pcp_tgu_service.domain.PlatformCatalogItem
 import space.nstart.pcp_tgu_service.dto.NsiPlatformDto
+import space.nstart.pcp_tgu_service.integration.api.OrdinisUnavailableException
 import space.nstart.pcp_tgu_service.integration.api.PlatformsClassifierClient
 import org.slf4j.LoggerFactory
 import org.springframework.stereotype.Service
@@ -16,6 +17,7 @@ class PlatformService(
     private val platformsClassifierClient: PlatformsClassifierClient,
     private val classifierProperties: ClassifierProperties,
     private val objectMapper: ObjectMapper,
+    private val ordinisAvailabilityMetrics: OrdinisAvailabilityMetrics,
     private val clock: Clock = Clock.systemUTC()
 ) {
     private val log = LoggerFactory.getLogger(javaClass)
@@ -63,7 +65,40 @@ class PlatformService(
     }
 
     private fun fetchAndCachePlatforms(now: Instant): List<PlatformCatalogItem> {
-        return cachePlatforms(platformsClassifierClient.fetchPlatforms(), now)
+        return try {
+            val platforms = cachePlatforms(platformsClassifierClient.fetchPlatforms(), now)
+            ordinisAvailabilityMetrics.markAvailable()
+            platforms
+        } catch (ex: OrdinisUnavailableException) {
+            ordinisAvailabilityMetrics.markUnavailable()
+            useStaleCacheOrRethrow(ex)
+        }
+    }
+
+    private fun useStaleCacheOrRethrow(ex: OrdinisUnavailableException): List<PlatformCatalogItem> {
+        val staleCache = cachedPlatforms
+        if (staleCache != null) {
+            log.warn(
+                "Ordinis classifier is unavailable. Using stale platform cache. platformsUrl={}, cachedCount={}, cacheExpiredAt={}, status={}, errorType={}, errorMessage={}",
+                classifierProperties.platformsUrl,
+                staleCache.platforms.size,
+                staleCache.expiresAt,
+                ex.statusCode,
+                rootErrorType(ex),
+                rootErrorMessage(ex)
+            )
+            return staleCache.platforms
+        }
+
+        log.error(
+            "Ordinis classifier is unavailable and no platform cache is available. Platform sync cannot continue. platformsUrl={}, status={}, errorType={}, errorMessage={}",
+            classifierProperties.platformsUrl,
+            ex.statusCode,
+            rootErrorType(ex),
+            rootErrorMessage(ex),
+            ex
+        )
+        throw ex
     }
 
     private fun cachePlatforms(platformDtos: List<NsiPlatformDto>, now: Instant): List<PlatformCatalogItem> {
@@ -103,4 +138,10 @@ class PlatformService(
     ) {
         fun isActual(now: Instant): Boolean = now.isBefore(expiresAt)
     }
+
+    private fun rootErrorType(ex: OrdinisUnavailableException): String =
+        ex.cause?.javaClass?.simpleName ?: ex.javaClass.simpleName
+
+    private fun rootErrorMessage(ex: OrdinisUnavailableException): String? =
+        ex.cause?.message ?: ex.message
 }

services/pcp-tgu-service/src/main/resources/application.yml

@@ -31,3 +31,9 @@ topics:
 tgu:
   test-controller:
     enabled: false
+
+management:
+  endpoints:
+    web:
+      exposure:
+        include: health,info,metrics,prometheus

services/pcp-tgu-service/src/test/kotlin/space/nstart/pcp_tgu_service/integration/api/ExternalPointsClientTest.kt

@@ -2,14 +2,15 @@ package space.nstart.pcp_tgu_service.integration.api
 
 import com.fasterxml.jackson.module.kotlin.jacksonObjectMapper
 import com.sun.net.httpserver.HttpServer
+import io.micrometer.core.instrument.simple.SimpleMeterRegistry
 import org.junit.jupiter.api.Assertions.assertEquals
 import org.junit.jupiter.api.Test
 import org.mockito.Mockito.mock
-import com.fasterxml.jackson.module.kotlin.jacksonObjectMapper
 import space.nstart.pcp_tgu_service.config.ClassifierProperties
 import space.nstart.pcp_tgu_service.config.ExternalApiProperties
 import space.nstart.pcp_tgu_service.config.PlanningProperties
 import space.nstart.pcp_tgu_service.domain.PlatformCatalogItem
+import space.nstart.pcp_tgu_service.service.OrdinisAvailabilityMetrics
 import space.nstart.pcp_tgu_service.service.PlatformService
 import java.net.InetSocketAddress
 import java.time.Instant
@@ -59,7 +60,8 @@ class ExternalPointsClientTest {
             platformsCacheTtl = java.time.Duration.ofMinutes(15),
             allowedPlatformStatuses = setOf("OPERATIONAL", "STANDBY")
         ),
-        jacksonObjectMapper().findAndRegisterModules()
+        jacksonObjectMapper().findAndRegisterModules(),
+        OrdinisAvailabilityMetrics(SimpleMeterRegistry())
     ) {
         override fun loadPlatforms(status: String?): List<PlatformCatalogItem> =
             error("ExternalPointsClient must use loadAllowedPlatforms")

services/pcp-tgu-service/src/test/kotlin/space/nstart/pcp_tgu_service/integration/api/PlatformsClassifierClientTest.kt

@@ -56,7 +56,7 @@ class PlatformsClassifierClientTest {
     }
 
     @Test
-    fun `fetchPlatforms throws clear error on empty body`() {
+    fun `fetchPlatforms reports Ordinis unavailability on empty body`() {
         withServer("") { baseUrl ->
             val client = PlatformsClassifierClient(
                 ClassifierProperties(
@@ -66,20 +66,41 @@ class PlatformsClassifierClientTest {
                 )
             )
 
-            val exception = assertThrows(IllegalStateException::class.java) {
+            val exception = assertThrows(OrdinisUnavailableException::class.java) {
                 client.fetchPlatforms()
             }
 
-            assertEquals("Classifier response body is empty: $baseUrl", exception.message)
+            assertEquals(baseUrl, exception.classifierUrl)
+            assertEquals("Classifier response body is empty: $baseUrl", exception.cause?.message)
         }
     }
 
-    private fun withServer(responseBody: String, block: (String) -> Unit) {
+    @Test
+    fun `fetchPlatforms reports Ordinis unavailability on response error`() {
+        withServer("""{"error":"down"}""", status = 503) { baseUrl ->
+            val client = PlatformsClassifierClient(
+                ClassifierProperties(
+                    platformsUrl = baseUrl,
+                    platformsCacheTtl = Duration.ofMinutes(15),
+                    allowedPlatformStatuses = setOf("OPERATIONAL", "STANDBY")
+                )
+            )
+
+            val exception = assertThrows(OrdinisUnavailableException::class.java) {
+                client.fetchPlatforms()
+            }
+
+            assertEquals(baseUrl, exception.classifierUrl)
+            assertEquals(503, exception.statusCode)
+        }
+    }
+
+    private fun withServer(responseBody: String, status: Int = 200, block: (String) -> Unit) {
         val server = HttpServer.create(InetSocketAddress(0), 0)
         server.createContext("/") { exchange ->
             val responseBytes = responseBody.toByteArray()
             exchange.responseHeaders.add("Content-Type", "application/json")
-            exchange.sendResponseHeaders(200, responseBytes.size.toLong())
+            exchange.sendResponseHeaders(status, responseBytes.size.toLong())
             exchange.responseBody.use { body -> body.write(responseBytes) }
         }
         server.start()

services/pcp-tgu-service/src/test/kotlin/space/nstart/pcp_tgu_service/service/PlatformServiceTest.kt

@@ -1,7 +1,9 @@
 package space.nstart.pcp_tgu_service.service
 
 import com.fasterxml.jackson.module.kotlin.jacksonObjectMapper
+import io.micrometer.core.instrument.simple.SimpleMeterRegistry
 import org.junit.jupiter.api.Assertions.assertEquals
+import org.junit.jupiter.api.Assertions.assertThrows
 import org.junit.jupiter.api.Test
 import org.mockito.Mockito.mock
 import org.mockito.Mockito.times
@@ -10,6 +12,7 @@ import org.mockito.Mockito.`when`
 import space.nstart.pcp_tgu_service.config.ClassifierProperties
 import space.nstart.pcp_tgu_service.dto.NsiPlatformDataDto
 import space.nstart.pcp_tgu_service.dto.NsiPlatformDto
+import space.nstart.pcp_tgu_service.integration.api.OrdinisUnavailableException
 import space.nstart.pcp_tgu_service.integration.api.PlatformsClassifierClient
 import java.time.Clock
 import java.time.Duration
@@ -96,6 +99,50 @@ class PlatformServiceTest {
         verify(client, times(2)).fetchPlatforms()
     }
 
+    @Test
+    fun `loadPlatforms keeps stale cache when Ordinis is unavailable`() {
+        val clock = MutableClock(Instant.parse("2026-05-26T12:00:00Z"))
+        val meterRegistry = SimpleMeterRegistry()
+        val client = mock(PlatformsClassifierClient::class.java)
+        `when`(client.fetchPlatforms())
+            .thenReturn(listOf(platformDto(id = "cached-id", status = "OPERATIONAL", noradId = 1L)))
+            .thenThrow(ordinisUnavailable())
+        val service = service(
+            client = client,
+            clock = clock,
+            ordinisAvailabilityMetrics = OrdinisAvailabilityMetrics(meterRegistry)
+        )
+
+        val firstCall = service.loadPlatforms()
+        clock.advance(Duration.ofMinutes(15))
+        val staleCall = service.loadPlatforms()
+
+        assertEquals(listOf("cached-id"), firstCall.map { it.nsiId })
+        assertEquals(listOf("cached-id"), staleCall.map { it.nsiId })
+        assertEquals(1.0, meterRegistry.get(OrdinisAvailabilityMetrics.UNAVAILABLE).gauge().value())
+        assertEquals(1.0, meterRegistry.get(OrdinisAvailabilityMetrics.UNAVAILABLE_TOTAL).counter().count())
+        verify(client, times(2)).fetchPlatforms()
+    }
+
+    @Test
+    fun `loadPlatforms rethrows Ordinis outage when cache is empty`() {
+        val meterRegistry = SimpleMeterRegistry()
+        val client = mock(PlatformsClassifierClient::class.java)
+        `when`(client.fetchPlatforms()).thenThrow(ordinisUnavailable())
+        val service = service(
+            client = client,
+            ordinisAvailabilityMetrics = OrdinisAvailabilityMetrics(meterRegistry)
+        )
+
+        assertThrows(OrdinisUnavailableException::class.java) {
+            service.loadPlatforms()
+        }
+
+        assertEquals(1.0, meterRegistry.get(OrdinisAvailabilityMetrics.UNAVAILABLE).gauge().value())
+        assertEquals(1.0, meterRegistry.get(OrdinisAvailabilityMetrics.UNAVAILABLE_TOTAL).counter().count())
+        verify(client, times(1)).fetchPlatforms()
+    }
+
     @Test
     fun `loadAllowedPlatforms uses cached platforms and configured filtering`() {
         val now = Instant.parse("2026-05-26T12:00:00Z")
@@ -159,7 +206,8 @@ class PlatformServiceTest {
 
     private fun service(
         client: PlatformsClassifierClient,
-        clock: Clock = Clock.fixed(Instant.parse("2026-05-26T12:00:00Z"), ZoneOffset.UTC)
+        clock: Clock = Clock.fixed(Instant.parse("2026-05-26T12:00:00Z"), ZoneOffset.UTC),
+        ordinisAvailabilityMetrics: OrdinisAvailabilityMetrics = OrdinisAvailabilityMetrics(SimpleMeterRegistry())
     ): PlatformService =
         PlatformService(
             platformsClassifierClient = client,
@@ -169,9 +217,17 @@ class PlatformServiceTest {
                 allowedPlatformStatuses = setOf("OPERATIONAL")
             ),
             objectMapper = jacksonObjectMapper().findAndRegisterModules(),
+            ordinisAvailabilityMetrics = ordinisAvailabilityMetrics,
             clock = clock
         )
 
+    private fun ordinisUnavailable(): OrdinisUnavailableException =
+        OrdinisUnavailableException(
+            classifierUrl = "http://localhost",
+            statusCode = null,
+            cause = RuntimeException("Connection refused")
+        )
+
     private fun platformDto(
         id: String?,
         status: String,