release: v1.3.0 — 整站备份恢复、跨后端同步与任务中心

server/utils/backup/stats.ts

@@ -0,0 +1,38 @@
+import { stat } from 'node:fs/promises'
+import { join } from 'node:path'
+import { getDataDir } from '../data-dir'
+import { getImageTotals } from '../image-index'
+import { getBackupsDir } from './paths'
+
+export async function getBackupExportEstimate(): Promise<{
+  imageCount: number
+  imageBytes: number
+  databaseBytes: number
+  totalBytes: number
+}> {
+  const { count, bytes } = getImageTotals()
+  const databaseBytes = await (async () => {
+    try {
+      const dbStat = await stat(join(getDataDir(), 'pichost.db'))
+      return dbStat.size
+    } catch {
+      return 0
+    }
+  })()
+  return {
+    imageCount: count,
+    imageBytes: bytes,
+    databaseBytes,
+    totalBytes: bytes + databaseBytes
+  }
+}
+
+export async function getAvailableDiskBytes(): Promise<number | null> {
+  try {
+    const { statfs } = await import('node:fs/promises')
+    const stats = await statfs(getBackupsDir())
+    return Number(stats.bavail) * Number(stats.bsize)
+  } catch {
+    return null
+  }
+}