feat(signature): make host configurable and add WS reconnect

- New optional env SIGNATURE_HOST overrides the hardcoded
  192.168.10.5:2967 (defaults preserved for back-compat).
- WebSocket now reconnects with exponential backoff (1s, 2s, 4s ...
  capped at 30s) on close/error. Previously a dropped signature
  server connection silently disabled signature playback until the
  bot was restarted.

src/classes/SignatureClient.ts

@@ -4,6 +4,7 @@ import WebSocket from "ws";
 import ffmpeg from "fluent-ffmpeg";
 import { existsSync, mkdirSync, readdirSync, readFileSync, rmdirSync, rmSync, unlinkSync, writeFileSync } from "node:fs";
 import { Readable } from "node:stream";
+import { Config } from "../utils/Config";
 
 interface SignatureItem {
   name: string[];
@@ -17,10 +18,13 @@ mkdirSync(filePath, { recursive: true });
 
 export class SignatureClient {
   private readonly myClientId = "bot-"+Math.random().toString(36).slice(2, 9);
-  private readonly host = `192.168.10.5:2967`;
+  private readonly host = Config.signatureHost;
   private readonly wsUrl = `ws://${this.host}?clientId=${this.myClientId}`;
-  private ws = new WebSocket(this.wsUrl);
+  private ws!: WebSocket;
   private signatureList: SignatureItem[] = [];
+  private reconnectDelayMs = 1000;
+  private readonly reconnectMaxMs = 30_000;
+  private reconnectTimer?: NodeJS.Timeout;
 
   get list() {
     return this.signatureList;
@@ -36,8 +40,14 @@ export class SignatureClient {
   }
 
   constructor() {
+    this.connect();
+  }
+
+  private connect() {
+    this.ws = new WebSocket(this.wsUrl);
     this.ws.on("open", () => {
       Logger.ready("[WS] 서버 연결 성공");
+      this.reconnectDelayMs = 1000; // reset backoff on successful connect
       const requestMessage = JSON.stringify({ type: "GET_LIST" });
       this.ws.send(requestMessage);
     });
@@ -54,12 +64,27 @@ export class SignatureClient {
     });
     this.ws.on("close", () => {
       Logger.info("[WS] 서버 연결 종료");
+      this.scheduleReconnect();
     });
     this.ws.on("error", (error) => {
       Logger.error(`[WS] 오류 발생: ${String(error)}`);
+      // 'error' is typically followed by 'close' on the ws lib, but call
+      // out reconnect anyway in case the socket never closes cleanly.
+      try { this.ws.terminate(); } catch {}
     });
   }
 
+  private scheduleReconnect() {
+    if (this.reconnectTimer) return; // already scheduled
+    const delay = this.reconnectDelayMs;
+    this.reconnectDelayMs = Math.min(this.reconnectDelayMs * 2, this.reconnectMaxMs);
+    Logger.info(`[WS] ${delay}ms 후 재연결 시도`);
+    this.reconnectTimer = setTimeout(() => {
+      this.reconnectTimer = undefined;
+      this.connect();
+    }, delay);
+  }
+
   async changeVolume(buffer: Buffer, volume: number) {
     try {
       const inputStream = Readable.from(buffer);

src/utils/Config.ts

@@ -13,6 +13,7 @@ export const Config = {
     nid_ses: process.env.CHZZK_NID_SES?.trim(),
   },
   _ttsPath: process.env.TTSPATH?.trim(),
+  _signatureHost: process.env.SIGNATURE_HOST?.trim() || "192.168.10.5:2967",
   debug: process.env.DEBUG?.trim()?.toLocaleLowerCase() === "true",
   dev: process.env.DEV?.trim()?.toLocaleLowerCase() === "true",
   replaceObj: { ...def_replaceObj, ...JSON.parse(process.env.REPLACETEXT?.trim() || "[{}]")[0] },
@@ -48,6 +49,9 @@ export const Config = {
   get ttsPath() {
     if (!this._ttsPath) throw new ReferenceError("TTSPATH is missing");
     return this._ttsPath;
+  },
+  get signatureHost() {
+    return this._signatureHost;
   }
 };