fix(fx-gui): meter VST chạy đúng — bỏ điều kiện inRead chặn peek + chống race lúc load + ẩn cửa sổ native floating

app/api/v1/plugins.py

@@ -1,4 +1,4 @@
-import os, sys, uuid, json, tempfile, subprocess, time as _time, threading, asyncio
+import os, sys, uuid, json, tempfile, subprocess, time as _time, threading, asyncio, logging
 import numpy as np
 import soundfile as sf
 from fastapi import APIRouter, HTTPException, Depends, UploadFile, File, BackgroundTasks, Header, Query, WebSocket, WebSocketDisconnect
@@ -17,6 +17,8 @@ from app.core.auth import decode_token
 
 router = APIRouter()
 
+logger = logging.getLogger(__name__)
+
 UPLOAD_SF_DIR = os.path.join(settings.STORAGE_DIR, "soundfonts")
 os.makedirs(UPLOAD_SF_DIR, exist_ok=True)
 
@@ -871,6 +873,18 @@ async def open_fx_gui(req: FxGuiRequest, current_user: dict = Depends(get_curren
                 except Exception:
                     proc.kill()
                 raise HTTPException(status_code=500, detail="Bridge không báo port fx-gui (mở GUI thất bại).")
+            # Keep draining stdout in a daemon thread: the bridge logs to
+            # stdout/stderr while running; if the pipe fills (64KB) the bridge
+            # blocks on any later write -> GUI freezes/breaks.
+            def _drain_fx_gui_stdout(pp):
+                try:
+                    for ln in pp.stdout:
+                        ln = (ln or "").strip()
+                        if ln:
+                            logger.info("[fx-gui] %s", ln)
+                except Exception:
+                    pass
+            threading.Thread(target=_drain_fx_gui_stdout, args=(proc,), daemon=True).start()
             proc._sf_plugin_path = plugin_path
             proc._sf_embed_url = embed_url
             _register_fx_gui_process(proc)