M4: /fx-gui redirect vao session fxrt (native-window mode, embed_url=None) + watchdog auto-restart

app/api/v1/plugins.py

@@ -711,6 +711,24 @@ async def open_fx_gui(req: FxGuiRequest, current_user: dict = Depends(get_curren
     plugin_path = (req.path or "").strip()
     if not plugin_path:
         raise HTTPException(status_code=400, detail="Thiếu đường dẫn VST plugin.")
+    # ── Phase 2 (M4): plugin là slot của session FX realtime (mastering) → mở
+    # editor của CHÍNH instance DSP ngay trong fxrt_bridge (juce_fx_bridge) qua
+    # SHM ctrl ring ed.open — KHÔNG spawn fx_vst_bridge instance 2 + feeder
+    # (nguồn CPU 100%). GUI = cửa sổ native "FX slot N" trên desktop (không
+    # HTTP embed frame → embed_url=None, native=true — frontend M6 dùng mode
+    # này). Vẫn spawn fx_vst_bridge khi: không shm / session không tồn tại /
+    # plugin không phải slot chain (instrument, offline, fallback an toàn).
+    _sess = fx_realtime.get_session((req.shm or "").strip()) if (req.shm or "").strip() else None
+    if _sess is not None and _sess.alive():
+        _slot = _sess.chain_slot_for_path(plugin_path)
+        if _slot is not None:
+            _already = fx_realtime.editor_find(plugin_path)
+            _same = _already is not None and _already[0] == _sess.name
+            _sess.send_editor_cmd("open", slot=_slot)
+            fx_realtime.editor_register(plugin_path, _sess.name, _slot)
+            return {"success": True, "started": not _same,
+                    "already_running": bool(_same), "native": True,
+                    "embed_url": None, "session_id": _sess.name, "slot": _slot}
     # Tránh mở 2 GUI cùng plugin: nếu tiến trình bridge fx-gui cho plugin này
     # đang chạy → trả started=False (frontend có thể focus window cũ).
     for proc in _FX_GUI_PROCESSES:
@@ -808,6 +826,17 @@ async def close_fx_gui(req: FxGuiCloseRequest, current_user: dict = Depends(get_
     plugin_path = (req.path or "").strip()
     if not plugin_path:
         raise HTTPException(status_code=400, detail="Thiếu đường dẫn VST plugin.")
+    # M4: plugin đang mở native (editor instance DSP trong session fxrt) →
+    # gửi ed.close (đóng editor, GIỮ instance + state — mở lại nhanh).
+    _entry = fx_realtime.editor_find(plugin_path)
+    if _entry:
+        _sid, _slot = _entry
+        fx_realtime.editor_unregister(plugin_path)
+        _sess = fx_realtime.get_session(_sid)
+        if _sess is not None and _sess.alive():
+            _sess.send_editor_cmd("close", slot=_slot)
+            return {"success": True, "closed": True, "native": True}
+        # session đã chết — rơi xuống spawn fallback (đóng bridge fx-gui cũ nếu có)
     for proc in _FX_GUI_PROCESSES:
         if proc is not None and proc.poll() is None and getattr(proc, "_sf_plugin_path", None) == plugin_path:
             proc.terminate()
@@ -820,6 +849,49 @@ async def close_fx_gui(req: FxGuiCloseRequest, current_user: dict = Depends(get_
     return {"success": True, "closed": False}
 
 
+class FxGuiNativeRequest(BaseModel):
+    """Hide/Show GUI native (editor instance DSP trong session fxrt)."""
+    path: str
+
+
+def _fxrt_native_editor(plugin_path):
+    """(session, slot) nếu plugin đang mở native trong session fxrt sống."""
+    entry = fx_realtime.editor_find(plugin_path)
+    if not entry:
+        return None, None
+    sess = fx_realtime.get_session(entry[0])
+    if sess is None or not sess.alive():
+        fx_realtime.editor_unregister(plugin_path)
+        return None, None
+    return sess, entry[1]
+
+
+@router.post("/fx-gui/hide")
+async def hide_fx_gui(req: FxGuiNativeRequest,
+                      current_user: dict = Depends(get_current_user)):
+    """Ẩn GUI native (ed.hide — giữ editor + instance, mở lại nhanh). Chỉ
+    áp dụng editor in-process fxrt; GUI spawn mode (HTTP bridge) tự có /hide
+    riêng — trả applied=False không lỗi."""
+    enforce_password_changed(current_user)
+    sess, slot = _fxrt_native_editor((req.path or "").strip())
+    if sess is None:
+        return {"success": True, "applied": False}
+    sess.send_editor_cmd("hide", slot=slot)
+    return {"success": True, "applied": True, "native": True}
+
+
+@router.post("/fx-gui/show")
+async def show_fx_gui(req: FxGuiNativeRequest,
+                      current_user: dict = Depends(get_current_user)):
+    """Hiện lại GUI native (ed.show)."""
+    enforce_password_changed(current_user)
+    sess, slot = _fxrt_native_editor((req.path or "").strip())
+    if sess is None:
+        return {"success": True, "applied": False}
+    sess.send_editor_cmd("show", slot=slot)
+    return {"success": True, "applied": True, "native": True}
+
+
 _FX_GUI_PROCESSES = []  # list[subprocess.Popen] — các bridge fx-gui do app spawn
 
 def _register_fx_gui_process(proc):