From baeed4bc8057ec2623f983550cd63dff09c42c28 Mon Sep 17 00:00:00 2001
From: syuilo <4439005+syuilo@users.noreply.github.com>
Date: Thu, 18 Dec 2025 20:05:20 +0900
Subject: [PATCH] perf(backend): lazy load systeminformation
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systeminformationを必要とする機能を有効にしていないサーバーで無駄に読み込まれることが無いように
---
 packages/backend/src/core/AiService.ts                      | 2 +-
 packages/backend/src/daemons/ServerStatsService.ts          | 6 ++++--
 packages/backend/src/misc/show-machine-info.ts              | 6 +-----
 .../backend/src/server/api/endpoints/admin/server-info.ts   | 3 ++-
 packages/backend/src/server/api/endpoints/server-info.ts    | 3 ++-
 5 files changed, 10 insertions(+), 10 deletions(-)

diff --git a/packages/backend/src/core/AiService.ts b/packages/backend/src/core/AiService.ts
index 7a005400bb..cbae280030 100644
--- a/packages/backend/src/core/AiService.ts
+++ b/packages/backend/src/core/AiService.ts
@@ -7,7 +7,6 @@ import * as fs from 'node:fs';
 import { fileURLToPath } from 'node:url';
 import { dirname } from 'node:path';
 import { Injectable } from '@nestjs/common';
-import si from 'systeminformation';
 import { Mutex } from 'async-mutex';
 import fetch from 'node-fetch';
 import { bindThis } from '@/decorators.js';
@@ -84,6 +83,7 @@ export class AiService {
 
 	@bindThis
 	private async getCpuFlags(): Promise<string[]> {
+		const si = await import('systeminformation');
 		const str = await si.cpuFlags();
 		return str.split(/\s+/);
 	}
diff --git a/packages/backend/src/daemons/ServerStatsService.ts b/packages/backend/src/daemons/ServerStatsService.ts
index d229efb123..a972e5861c 100644
--- a/packages/backend/src/daemons/ServerStatsService.ts
+++ b/packages/backend/src/daemons/ServerStatsService.ts
@@ -4,13 +4,12 @@
  */
 
 import { Inject, Injectable } from '@nestjs/common';
-import si from 'systeminformation';
 import Xev from 'xev';
 import * as osUtils from 'os-utils';
 import { bindThis } from '@/decorators.js';
-import type { OnApplicationShutdown } from '@nestjs/common';
 import { MiMeta } from '@/models/_.js';
 import { DI } from '@/di-symbols.js';
+import type { OnApplicationShutdown } from '@nestjs/common';
 
 const ev = new Xev();
 
@@ -97,12 +96,14 @@ function cpuUsage(): Promise<number> {
 
 // MEMORY STAT
 async function mem() {
+	const si = await import('systeminformation');
 	const data = await si.mem();
 	return data;
 }
 
 // NETWORK STAT
 async function net() {
+	const si = await import('systeminformation');
 	const iface = await si.networkInterfaceDefault();
 	const data = await si.networkStats(iface);
 	return data[0];
@@ -110,5 +111,6 @@ async function net() {
 
 // FS STAT
 async function fs() {
+	const si = await import('systeminformation');
 	return await si.disksIO().catch(() => ({ rIO_sec: 0, wIO_sec: 0 }));
 }
diff --git a/packages/backend/src/misc/show-machine-info.ts b/packages/backend/src/misc/show-machine-info.ts
index 8ddec35f23..b279eb9546 100644
--- a/packages/backend/src/misc/show-machine-info.ts
+++ b/packages/backend/src/misc/show-machine-info.ts
@@ -4,15 +4,11 @@
  */
 
 import * as os from 'node:os';
-import sysUtils from 'systeminformation';
 import type Logger from '@/logger.js';
 
 export async function showMachineInfo(parentLogger: Logger) {
 	const logger = parentLogger.createSubLogger('machine');
 	logger.debug(`Hostname: ${os.hostname()}`);
 	logger.debug(`Platform: ${process.platform} Arch: ${process.arch}`);
-	const mem = await sysUtils.mem();
-	const totalmem = (mem.total / 1024 / 1024 / 1024).toFixed(1);
-	const availmem = (mem.available / 1024 / 1024 / 1024).toFixed(1);
-	logger.debug(`CPU: ${os.cpus().length} core MEM: ${totalmem}GB (available: ${availmem}GB)`);
+	logger.debug(`CPU: ${os.cpus().length} core MEM: ${(os.totalmem() / 1024 / 1024 / 1024).toFixed(1)}GB (available: ${(os.freemem() / 1024 / 1024 / 1024).toFixed(1)}GB)`);
 }
diff --git a/packages/backend/src/server/api/endpoints/admin/server-info.ts b/packages/backend/src/server/api/endpoints/admin/server-info.ts
index 80b6a4d32e..603be514c8 100644
--- a/packages/backend/src/server/api/endpoints/admin/server-info.ts
+++ b/packages/backend/src/server/api/endpoints/admin/server-info.ts
@@ -4,7 +4,6 @@
  */
 
 import * as os from 'node:os';
-import si from 'systeminformation';
 import { Inject, Injectable } from '@nestjs/common';
 import { DataSource } from 'typeorm';
 import * as Redis from 'ioredis';
@@ -112,6 +111,8 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 
 	) {
 		super(meta, paramDef, async () => {
+			const si = await import('systeminformation');
+
 			const memStats = await si.mem();
 			const fsStats = await si.fsSize();
 			const netInterface = await si.networkInterfaceDefault();
diff --git a/packages/backend/src/server/api/endpoints/server-info.ts b/packages/backend/src/server/api/endpoints/server-info.ts
index 8301c85f2e..0e8dc73ad9 100644
--- a/packages/backend/src/server/api/endpoints/server-info.ts
+++ b/packages/backend/src/server/api/endpoints/server-info.ts
@@ -4,7 +4,6 @@
  */
 
 import * as os from 'node:os';
-import si from 'systeminformation';
 import { Inject, Injectable } from '@nestjs/common';
 import { Endpoint } from '@/server/api/endpoint-base.js';
 import { MiMeta } from '@/models/_.js';
@@ -93,6 +92,8 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 				},
 			};
 
+			const si = await import('systeminformation');
+
 			const memStats = await si.mem();
 			const fsStats = await si.fsSize();