main.py

import os
import importlib.util
import folder_paths
import time

def execute_prestartup_script():
    def execute_script(script_path):
        module_name = os.path.splitext(script_path)[0]
        try:
            spec = importlib.util.spec_from_file_location(module_name, script_path)
            module = importlib.util.module_from_spec(spec)
            spec.loader.exec_module(module)
            return True
        except Exception as e:
            print(f"Failed to execute startup-script: {script_path} / {e}")
        return False

    node_paths = folder_paths.get_folder_paths("custom_nodes")
    for custom_node_path in node_paths:
        possible_modules = os.listdir(custom_node_path)
        node_prestartup_times = []

        for possible_module in possible_modules:
            module_path = os.path.join(custom_node_path, possible_module)
            if os.path.isfile(module_path) or module_path.endswith(".disabled") or module_path == "__pycache__":
                continue

            script_path = os.path.join(module_path, "prestartup_script.py")
            if os.path.exists(script_path):
                time_before = time.perf_counter()
                success = execute_script(script_path)
                node_prestartup_times.append((time.perf_counter() - time_before, module_path, success))
    if len(node_prestartup_times) > 0:
        print("\nPrestartup times for custom nodes:")
        for n in sorted(node_prestartup_times):
            if n[2]:
                import_message = ""
            else:
                import_message = " (PRESTARTUP FAILED)"
            print("{:6.1f} seconds{}:".format(n[0], import_message), n[1])
        print()

execute_prestartup_script()


# Main code
import asyncio
import itertools
import shutil
import threading
import gc

from comfy.cli_args import args

if os.name == "nt":
    import logging
    logging.getLogger("xformers").addFilter(lambda record: 'A matching Triton is not available' not in record.getMessage())

if __name__ == "__main__":
    if args.cuda_device is not None:
        os.environ['CUDA_VISIBLE_DEVICES'] = str(args.cuda_device)
        print("Set cuda device to:", args.cuda_device)

    if not args.cuda_malloc:
        try: #if there's a better way to check the torch version without importing it let me know
            version = ""
            torch_spec = importlib.util.find_spec("torch")
            for folder in torch_spec.submodule_search_locations:
                ver_file = os.path.join(folder, "version.py")
                if os.path.isfile(ver_file):
                    spec = importlib.util.spec_from_file_location("torch_version_import", ver_file)
                    module = importlib.util.module_from_spec(spec)
                    spec.loader.exec_module(module)
                    version = module.__version__
            if int(version[0]) >= 2: #enable by default for torch version 2.0 and up
                args.cuda_malloc = True
        except:
            pass

    if args.cuda_malloc and not args.disable_cuda_malloc:
        env_var = os.environ.get('PYTORCH_CUDA_ALLOC_CONF', None)
        if env_var is None:
            env_var = "backend:cudaMallocAsync"
        else:
            env_var += ",backend:cudaMallocAsync"

        os.environ['PYTORCH_CUDA_ALLOC_CONF'] = env_var

import comfy.utils
import yaml

import execution
import server
from server import BinaryEventTypes
from nodes import init_custom_nodes
import comfy.model_management

def prompt_worker(q, server):
    e = execution.PromptExecutor(server)
    while True:
        item, item_id = q.get()
        execution_start_time = time.perf_counter()
        prompt_id = item[1]
        e.execute(item[2], prompt_id, item[3], item[4])
        q.task_done(item_id, e.outputs_ui)
        if server.client_id is not None:
            server.send_sync("executing", { "node": None, "prompt_id": prompt_id }, server.client_id)

        print("Prompt executed in {:.2f} seconds".format(time.perf_counter() - execution_start_time))
        gc.collect()
        comfy.model_management.soft_empty_cache()

async def run(server, address='', port=8188, verbose=True, call_on_start=None):
    await asyncio.gather(server.start(address, port, verbose, call_on_start), server.publish_loop())


def hijack_progress(server):
    def hook(value, total, preview_image_bytes):
        server.send_sync("progress", {"value": value, "max": total}, server.client_id)
        if preview_image_bytes is not None:
            server.send_sync(BinaryEventTypes.PREVIEW_IMAGE, preview_image_bytes, server.client_id)
    comfy.utils.set_progress_bar_global_hook(hook)


def cleanup_temp():
    temp_dir = os.path.join(os.path.dirname(os.path.realpath(__file__)), "temp")
    if os.path.exists(temp_dir):
        shutil.rmtree(temp_dir, ignore_errors=True)


def load_extra_path_config(yaml_path):
    with open(yaml_path, 'r') as stream:
        config = yaml.safe_load(stream)
    for c in config:
        conf = config[c]
        if conf is None:
            continue
        base_path = None
        if "base_path" in conf:
            base_path = conf.pop("base_path")
        for x in conf:
            for y in conf[x].split("\n"):
                if len(y) == 0:
                    continue
                full_path = y
                if base_path is not None:
                    full_path = os.path.join(base_path, full_path)
                print("Adding extra search path", x, full_path)
                folder_paths.add_model_folder_path(x, full_path)


if __name__ == "__main__":
    cleanup_temp()

    loop = asyncio.new_event_loop()
    asyncio.set_event_loop(loop)
    server = server.PromptServer(loop)
    q = execution.PromptQueue(server)

    extra_model_paths_config_path = os.path.join(os.path.dirname(os.path.realpath(__file__)), "extra_model_paths.yaml")
    if os.path.isfile(extra_model_paths_config_path):
        load_extra_path_config(extra_model_paths_config_path)

    if args.extra_model_paths_config:
        for config_path in itertools.chain(*args.extra_model_paths_config):
            load_extra_path_config(config_path)

    init_custom_nodes()
    server.add_routes()
    hijack_progress(server)

    threading.Thread(target=prompt_worker, daemon=True, args=(q, server,)).start()

    if args.output_directory:
        output_dir = os.path.abspath(args.output_directory)
        print(f"Setting output directory to: {output_dir}")
        folder_paths.set_output_directory(output_dir)

    if args.quick_test_for_ci:
        exit(0)

    call_on_start = None
    if args.auto_launch:
        def startup_server(address, port):
            import webbrowser
            webbrowser.open(f"http://{address}:{port}")
        call_on_start = startup_server

    try:
        loop.run_until_complete(run(server, address=args.listen, port=args.port, verbose=not args.dont_print_server, call_on_start=call_on_start))
    except KeyboardInterrupt:
        print("\nStopped server")

    cleanup_temp()