Harden server state and config persistence

src/server/singbox.js

@@ -1,7 +1,7 @@
 import fs from 'node:fs';
-import path from 'node:path';
 import { settings } from './config.js';
 import { HarborError } from '../shared/errors.js';
+import { atomicWriteFile, atomicWriteJson } from './services/stateStore.js';
 
 const PROXY_TYPES = new Set(['vless', 'vmess', 'trojan', 'shadowsocks', 'hysteria2']);
 const MIXED_INBOUND = 'mixed-in';
@@ -77,8 +77,11 @@ export function buildGatewayConfig(subscriptionConfig, selectedTag, { clientDire
 }
 
 export function writeSingboxConfig(config) {
-  fs.mkdirSync(path.dirname(settings.configPath), { recursive: true });
-  fs.writeFileSync(settings.configPath, JSON.stringify(config, null, 2), 'utf8');
+  atomicWriteJson(settings.configPath, config);
+}
+
+export function restoreSingboxConfig(contents) {
+  atomicWriteFile(settings.configPath, contents);
 }
 
 export function removeSingboxConfig() {