perf: reuse mileage target snapshots

src/server/routes/mileage/target-vehicle-cache.test.ts

@@ -0,0 +1,70 @@
+import assert from 'node:assert/strict';
+import test from 'node:test';
+import { targetVehicleMileageFromMonitoringCache } from './target-vehicle-cache.js';
+import type { CachedVehicle, MonitoringCache } from './types.js';
+
+function vehicle(plate: string, overrides: Partial<CachedVehicle> = {}): CachedVehicle {
+  return {
+    plate,
+    vin: '',
+    dailyKm: 12.3,
+    totalKm: 456.7,
+    source: 'ONEOS_API',
+    sourceProtocol: 'GB32960',
+    sourceCategory: 'INSTRUMENT',
+    dataTime: '2026-08-07T10:00:00+08:00',
+    calculatedAt: null,
+    updatedAt: null,
+    isOnline: true,
+    isDataSynced: true,
+    customer: null,
+    department: null,
+    manager: null,
+    managerId: null,
+    rentStatus: null,
+    entity: null,
+    project: null,
+    region: null,
+    brand: null,
+    targetNames: [],
+    yesterdayKm: 0,
+    ...overrides,
+  };
+}
+
+function cache(vehicles: CachedVehicle[]): MonitoringCache {
+  return {
+    vehicles,
+    stats: { totalToday: 0, totalAll: 0, vehicleCount: vehicles.length },
+    filters: {
+      departments: [], customers: [], plates: [], projects: [], entities: [],
+      rentStatuses: [], platePrefixes: [], targetNames: [], regions: [], brands: [],
+    },
+    targetPlatesMap: new Map(),
+    updatedAt: '2026-08-07T10:00:00+08:00',
+  };
+}
+
+test('reuses only the current-day monitoring snapshot and filters target plates', () => {
+  const monitoringCache = cache([
+    vehicle('粤A1'),
+    vehicle('粤A2', { dailyKm: -1, totalKm: null, isOnline: false }),
+  ]);
+
+  const result = targetVehicleMileageFromMonitoringCache(
+    monitoringCache,
+    '2026-08-07',
+    '2026-08-07',
+    ['粤A2'],
+  );
+  assert.deepEqual(Array.from(result || []), [['粤A2', {
+    dailyKm: 0,
+    totalKm: null,
+    isOnline: false,
+  }]]);
+  assert.equal(
+    targetVehicleMileageFromMonitoringCache(monitoringCache, '2026-08-06', '2026-08-07', ['粤A2']),
+    null,
+  );
+  assert.equal(targetVehicleMileageFromMonitoringCache(null, '2026-08-07', '2026-08-07', ['粤A2']), null);
+});

src/server/routes/mileage/target-vehicle-cache.ts

@@ -0,0 +1,27 @@
+import type { MonitoringCache } from './types.js';
+
+export interface TargetVehicleMileageSnapshot {
+  dailyKm: number;
+  totalKm: number | null;
+  isOnline: boolean;
+}
+
+export function targetVehicleMileageFromMonitoringCache(
+  cache: MonitoringCache | null,
+  requestedDate: string,
+  today: string,
+  plates: string[],
+): Map<string, TargetVehicleMileageSnapshot> | null {
+  if (!cache || !requestedDate || requestedDate !== today) return null;
+
+  const selected = new Set(plates);
+  return new Map(
+    cache.vehicles
+      .filter(vehicle => selected.has(vehicle.plate))
+      .map(vehicle => [vehicle.plate, {
+        dailyKm: Math.max(0, Number(vehicle.dailyKm) || 0),
+        totalKm: vehicle.totalKm == null ? null : Math.max(0, Number(vehicle.totalKm) || 0),
+        isOnline: vehicle.isOnline,
+      }]),
+  );
+}

src/server/routes/mileage/targets.ts

@@ -4,6 +4,8 @@ import { getCache } from './cache.js';
 import { fetchOneOsDailyMileage } from './oneos-api.js';
 import { fetchVehicleInfoByPlates } from './vehicle-info.js';
 import { filterByPermission, maskCustomerNames } from '../../auth/permissions.js';
+import { shanghaiDate } from './monitoring-cache-policy.js';
+import { targetVehicleMileageFromMonitoringCache } from './target-vehicle-cache.js';
 
 const app = new Hono();
 
@@ -252,11 +254,20 @@ app.get('/:id/vehicles', async (c) => {
     ) as [any[], unknown];
 
     const plates: string[] = rows.map((r: any) => r.plate_number);
-    const infoMap = await fetchVehicleInfoByPlates(plates);
+    const cachedDateMileageMap = targetVehicleMileageFromMonitoringCache(
+      getCache(),
+      date,
+      shanghaiDate(),
+      plates,
+    );
+    const [infoMap, mileageRows] = await Promise.all([
+      fetchVehicleInfoByPlates(plates),
+      date && !cachedDateMileageMap ? fetchOneOsDailyMileage(date, plates) : Promise.resolve([]),
+    ]);
 
-    const dateMileageMap = new Map<string, { dailyKm: number; totalKm: number | null; isOnline: boolean }>();
-    if (date && plates.length > 0) {
-      const mileageRows = await fetchOneOsDailyMileage(date, plates);
+    const dateMileageMap = cachedDateMileageMap
+      || new Map<string, { dailyKm: number; totalKm: number | null; isOnline: boolean }>();
+    if (!cachedDateMileageMap && date && plates.length > 0) {
       for (const m of mileageRows) {
         const existing = dateMileageMap.get(m.plateNumber);
         const dailyKm = m.status === 'NORMAL' ? (Number(m.dailyMileageKm) || 0) : 0;