feat: add yt-dlp download processor

worker/processor.ts

@@ -0,0 +1,61 @@
+import { spawn } from 'child_process'
+import { readdirSync, statSync } from 'fs'
+import path from 'path'
+import { prisma } from '@/lib/prisma'
+import { buildYtdlpArgs } from '@/lib/ytdlp'
+import { createToken } from '@/lib/token'
+import { config } from '../config/app.config'
+
+export async function processDownload(downloadId: string): Promise<void> {
+  const download = await prisma.download.findUnique({ where: { id: downloadId } })
+  if (!download) return
+
+  const args = buildYtdlpArgs({
+    url: download.url,
+    uuid: download.uuid,
+    format: download.format,
+    quality: download.quality,
+    subtitles: download.subtitles,
+    extraArgs: download.extraArgs,
+  })
+
+  let stderr = ''
+
+  await new Promise<void>((resolve) => {
+    const proc = spawn('yt-dlp', args)
+    proc.stderr.on('data', (chunk: Buffer) => { stderr += chunk.toString() })
+
+    proc.on('close', async (code) => {
+      if (code === 0) {
+        const files = readdirSync(config.STORAGE_PATH).filter((f) =>
+          f.startsWith(download.uuid)
+        )
+        const relFile = files[0] ?? null
+        const filePath = relFile ? path.join(config.STORAGE_PATH, relFile) : null
+        const fileSize = filePath ? BigInt(statSync(filePath).size) : null
+
+        await prisma.download.update({
+          where: { id: downloadId },
+          data: {
+            status: 'DONE',
+            filePath,
+            fileName: relFile,
+            fileSize,
+            completedAt: new Date(),
+          },
+        })
+        await createToken(downloadId)
+      } else {
+        await prisma.download.update({
+          where: { id: downloadId },
+          data: {
+            status: 'FAILED',
+            errorMsg: stderr || `yt-dlp exited with code ${code}`,
+            completedAt: new Date(),
+          },
+        })
+      }
+      resolve()
+    })
+  })
+}