perf: use read stream to transfer data

Signed-off-by: Innei <tukon479@gmail.com>

src/modules/backup/backup.service.ts

@@ -2,7 +2,6 @@ import { existsSync, statSync } from 'fs'
 import { readFile, readdir, rm, writeFile } from 'fs/promises'
 import mkdirp from 'mkdirp'
 import { join, resolve } from 'path'
-import { Readable } from 'stream'
 import { quiet } from 'zx-cjs'
 
 import {
@@ -116,10 +115,7 @@ export class BackupService {
 
   async getFileStream(dirname: string) {
     const path = this.checkBackupExist(dirname)
-    const stream = new Readable()
-
-    stream.push(await readFile(path))
-    stream.push(null)
+    const stream = fs.createReadStream(path)
 
     return stream
   }

src/modules/file/file.controller.ts

@@ -47,7 +47,7 @@ export class FileController {
     const mimetype = lookup(ext)
 
     try {
-      const buffer = await this.service.getFile(type, name)
+      const stream = this.service.getFileStream(type, name)
       if (mimetype) {
         reply.type(mimetype)
         reply.header('cache-control', 'public, max-age=31536000')
@@ -57,7 +57,7 @@ export class FileController {
         )
       }
 
-      reply.send(buffer)
+      reply.send(stream)
     } catch {
       throw new CannotFindException()
     }

src/modules/file/file.service.ts

@@ -24,8 +24,8 @@ export class FileService {
       .catch(() => false)
   }
 
-  async getFile(type: FileType, name: string) {
-    return await fs.readFile(this.resolveFilePath(type, name))
+  getFileStream(type: FileType, name: string) {
+    return fs.createReadStream(this.resolveFilePath(type, name))
   }
 
   writeFile(