custom_nodes/ComfyUI_HuggingFace_Downloader/__init__.py

from .HuggingFaceDownloadModel import HuggingFaceDownloadModel
from .HuggingFaceDownloadFolder import HuggingFaceDownloadFolder
import threading
import time

NODE_CLASS_MAPPINGS = {
    "Hugging Face Download Model": HuggingFaceDownloadModel,
    "Hugging Face Download Folder": HuggingFaceDownloadFolder,
}

WEB_DIRECTORY = "./js"

__all__ = ["NODE_CLASS_MAPPINGS", "WEB_DIRECTORY"]

# Register web API
try:
    from . import web_api
    import server

    _web_api_registered = False
    _web_api_register_lock = threading.Lock()

    def _try_register_web_api_once() -> bool:
        global _web_api_registered
        with _web_api_register_lock:
            if _web_api_registered:
                return True
            prompt_instance = getattr(server.PromptServer, "instance", None)
            if prompt_instance is None:
                return False
            try:
                # Primary path (aiohttp app router)
                web_api.setup(getattr(prompt_instance, "app", None))
                # Fallback path for environments that expose route table differently
                web_api.setup(prompt_instance)
                _web_api_registered = True
                print("[ComfyUI_HuggingFace_Downloader] Web API routes registered.")
                return True
            except Exception as inner_error:
                print(f"[ComfyUI_HuggingFace_Downloader] Web API registration attempt failed: {inner_error}")
                return False

    def _register_web_api_with_retry():
        # PromptServer.instance can be unavailable at extension import time.
        for _ in range(120):  # up to ~60s
            if _try_register_web_api_once():
                return
            time.sleep(0.5)
        print("[ComfyUI_HuggingFace_Downloader] Web API registration timed out waiting for PromptServer.instance.")

    if not _try_register_web_api_once():
        threading.Thread(target=_register_web_api_with_retry, daemon=True).start()
except Exception as e:
    print(f"[ComfyUI_HuggingFace_Downloader] Web API not loaded: {e}")