server.py

import os
import sys
import asyncio
import traceback

import nodes
import folder_paths
import execution
import uuid
import urllib
import json
import glob
import struct
import ssl
import socket
import ipaddress
from PIL import Image, ImageOps
from PIL.PngImagePlugin import PngInfo
from io import BytesIO

import aiohttp
from aiohttp import web
import logging

import mimetypes
from comfy.cli_args import args
import comfy.utils
import comfy.model_management
from comfy_api import feature_flags
import node_helpers
from comfyui_version import __version__
from app.frontend_management import FrontendManager
from comfy_api.internal import _ComfyNodeInternal

from app.user_manager import UserManager
from app.model_manager import ModelFileManager
from app.custom_node_manager import CustomNodeManager
from typing import Optional, Union
from api_server.routes.internal.internal_routes import InternalRoutes
from protocol import BinaryEventTypes

# Import cache control middleware
from middleware.cache_middleware import cache_control

async def send_socket_catch_exception(function, message):
    try:
        await function(message)
    except (aiohttp.ClientError, aiohttp.ClientPayloadError, ConnectionResetError, BrokenPipeError, ConnectionError) as err:
        logging.warning("send error: {}".format(err))

@web.middleware
async def compress_body(request: web.Request, handler):
    accept_encoding = request.headers.get("Accept-Encoding", "")
    response: web.Response = await handler(request)
    if not isinstance(response, web.Response):
        return response
    if response.content_type not in ["application/json", "text/plain"]:
        return response
    if response.body and "gzip" in accept_encoding:
        response.enable_compression()
    return response


def create_cors_middleware(allowed_origin: str):
    @web.middleware
    async def cors_middleware(request: web.Request, handler):
        if request.method == "OPTIONS":
            # Pre-flight request. Reply successfully:
            response = web.Response()
        else:
            response = await handler(request)

        response.headers['Access-Control-Allow-Origin'] = allowed_origin
        response.headers['Access-Control-Allow-Methods'] = 'POST, GET, DELETE, PUT, OPTIONS'
        response.headers['Access-Control-Allow-Headers'] = 'Content-Type, Authorization'
        response.headers['Access-Control-Allow-Credentials'] = 'true'
        return response

    return cors_middleware

def is_loopback(host):
    if host is None:
        return False
    try:
        if ipaddress.ip_address(host).is_loopback:
            return True
        else:
            return False
    except:
        pass

    loopback = False
    for family in (socket.AF_INET, socket.AF_INET6):
        try:
            r = socket.getaddrinfo(host, None, family, socket.SOCK_STREAM)
            for family, _, _, _, sockaddr in r:
                if not ipaddress.ip_address(sockaddr[0]).is_loopback:
                    return loopback
                else:
                    loopback = True
        except socket.gaierror:
            pass

    return loopback


def create_origin_only_middleware():
    @web.middleware
    async def origin_only_middleware(request: web.Request, handler):
        #this code is used to prevent the case where a random website can queue comfy workflows by making a POST to 127.0.0.1 which browsers don't prevent for some dumb reason.
        #in that case the Host and Origin hostnames won't match
        #I know the proper fix would be to add a cookie but this should take care of the problem in the meantime
        if 'Host' in request.headers and 'Origin' in request.headers:
            host = request.headers['Host']
            origin = request.headers['Origin']
            host_domain = host.lower()
            parsed = urllib.parse.urlparse(origin)
            origin_domain = parsed.netloc.lower()
            host_domain_parsed = urllib.parse.urlsplit('//' + host_domain)

            #limit the check to when the host domain is localhost, this makes it slightly less safe but should still prevent the exploit
            loopback = is_loopback(host_domain_parsed.hostname)

            if parsed.port is None: #if origin doesn't have a port strip it from the host to handle weird browsers, same for host
                host_domain = host_domain_parsed.hostname
            if host_domain_parsed.port is None:
                origin_domain = parsed.hostname

            if loopback and host_domain is not None and origin_domain is not None and len(host_domain) > 0 and len(origin_domain) > 0:
                if host_domain != origin_domain:
                    logging.warning("WARNING: request with non matching host and origin {} != {}, returning 403".format(host_domain, origin_domain))
                    return web.Response(status=403)

        if request.method == "OPTIONS":
            response = web.Response()
        else:
            response = await handler(request)

        return response

    return origin_only_middleware

class PromptServer():
    def __init__(self, loop):
        PromptServer.instance = self

        mimetypes.init()
        mimetypes.add_type('application/javascript; charset=utf-8', '.js')
        mimetypes.add_type('image/webp', '.webp')

        self.user_manager = UserManager()
        self.model_file_manager = ModelFileManager()
        self.custom_node_manager = CustomNodeManager()
        self.internal_routes = InternalRoutes(self)
        self.supports = ["custom_nodes_from_web"]
        self.prompt_queue = execution.PromptQueue(self)
        self.loop = loop
        self.messages = asyncio.Queue()
        self.client_session:Optional[aiohttp.ClientSession] = None
        self.number = 0

        middlewares = [cache_control]
        if args.enable_compress_response_body:
            middlewares.append(compress_body)

        if args.enable_cors_header:
            middlewares.append(create_cors_middleware(args.enable_cors_header))
        else:
            middlewares.append(create_origin_only_middleware())

        max_upload_size = round(args.max_upload_size * 1024 * 1024)
        self.app = web.Application(client_max_size=max_upload_size, middlewares=middlewares)
        self.sockets = dict()
        self.sockets_metadata = dict()
        self.web_root = (
            FrontendManager.init_frontend(args.front_end_version)
            if args.front_end_root is None
            else args.front_end_root
        )
        logging.info(f"[Prompt Server] web root: {self.web_root}")
        routes = web.RouteTableDef()
        self.routes = routes
        self.last_node_id = None
        self.client_id = None

        self.on_prompt_handlers = []

        @routes.get('/ws')
        async def websocket_handler(request):
            ws = web.WebSocketResponse()
            await ws.prepare(request)
            sid = request.rel_url.query.get('clientId', '')
            if sid:
                # Reusing existing session, remove old
                self.sockets.pop(sid, None)
            else:
                sid = uuid.uuid4().hex

            # Store WebSocket for backward compatibility
            self.sockets[sid] = ws
            # Store metadata separately
            self.sockets_metadata[sid] = {"feature_flags": {}}

            try:
                # Send initial state to the new client
                await self.send("status", {"status": self.get_queue_info(), "sid": sid}, sid)
                # On reconnect if we are the currently executing client send the current node
                if self.client_id == sid and self.last_node_id is not None:
                    await self.send("executing", { "node": self.last_node_id }, sid)

                # Flag to track if we've received the first message
                first_message = True

                async for msg in ws:
                    if msg.type == aiohttp.WSMsgType.ERROR:
                        logging.warning('ws connection closed with exception %s' % ws.exception())
                    elif msg.type == aiohttp.WSMsgType.TEXT:
                        try:
                            data = json.loads(msg.data)
                            # Check if first message is feature flags
                            if first_message and data.get("type") == "feature_flags":
                                # Store client feature flags
                                client_flags = data.get("data", {})
                                self.sockets_metadata[sid]["feature_flags"] = client_flags

                                # Send server feature flags in response
                                await self.send(
                                    "feature_flags",
                                    feature_flags.get_server_features(),
                                    sid,
                                )

                                logging.debug(
                                    f"Feature flags negotiated for client {sid}: {client_flags}"
                                )
                            first_message = False
                        except json.JSONDecodeError:
                            logging.warning(
                                f"Invalid JSON received from client {sid}: {msg.data}"
                            )
                        except Exception as e:
                            logging.error(f"Error processing WebSocket message: {e}")
            finally:
                self.sockets.pop(sid, None)
                self.sockets_metadata.pop(sid, None)
            return ws

        @routes.get("/")
        async def get_root(request):
            response = web.FileResponse(os.path.join(self.web_root, "index.html"))
            response.headers['Cache-Control'] = 'no-cache'
            response.headers["Pragma"] = "no-cache"
            response.headers["Expires"] = "0"
            return response

        @routes.get("/embeddings")
        def get_embeddings(request):
            embeddings = folder_paths.get_filename_list("embeddings")
            return web.json_response(list(map(lambda a: os.path.splitext(a)[0], embeddings)))

        @routes.get("/models")
        def list_model_types(request):
            model_types = list(folder_paths.folder_names_and_paths.keys())

            return web.json_response(model_types)

        @routes.get("/models/{folder}")
        async def get_models(request):
            folder = request.match_info.get("folder", None)
            if not folder in folder_paths.folder_names_and_paths:
                return web.Response(status=404)
            files = folder_paths.get_filename_list(folder)
            return web.json_response(files)

        @routes.get("/extensions")
        async def get_extensions(request):
            files = glob.glob(os.path.join(
                glob.escape(self.web_root), 'extensions/**/*.js'), recursive=True)

            extensions = list(map(lambda f: "/" + os.path.relpath(f, self.web_root).replace("\\", "/"), files))

            for name, dir in nodes.EXTENSION_WEB_DIRS.items():
                files = glob.glob(os.path.join(glob.escape(dir), '**/*.js'), recursive=True)
                extensions.extend(list(map(lambda f: "/extensions/" + urllib.parse.quote(
                    name) + "/" + os.path.relpath(f, dir).replace("\\", "/"), files)))

            return web.json_response(extensions)

        def get_dir_by_type(dir_type):
            if dir_type is None:
                dir_type = "input"

            if dir_type == "input":
                type_dir = folder_paths.get_input_directory()
            elif dir_type == "temp":
                type_dir = folder_paths.get_temp_directory()
            elif dir_type == "output":
                type_dir = folder_paths.get_output_directory()

            return type_dir, dir_type

        def compare_image_hash(filepath, image):
            hasher = node_helpers.hasher()

            # function to compare hashes of two images to see if it already exists, fix to #3465
            if os.path.exists(filepath):
                a = hasher()
                b = hasher()
                with open(filepath, "rb") as f:
                    a.update(f.read())
                    b.update(image.file.read())
                    image.file.seek(0)
                return a.hexdigest() == b.hexdigest()
            return False

        def image_upload(post, image_save_function=None):
            image = post.get("image")
            overwrite = post.get("overwrite")
            image_is_duplicate = False

            image_upload_type = post.get("type")
            upload_dir, image_upload_type = get_dir_by_type(image_upload_type)

            if image and image.file:
                filename = image.filename
                if not filename:
                    return web.Response(status=400)

                subfolder = post.get("subfolder", "")
                full_output_folder = os.path.join(upload_dir, os.path.normpath(subfolder))
                filepath = os.path.abspath(os.path.join(full_output_folder, filename))

                if os.path.commonpath((upload_dir, filepath)) != upload_dir:
                    return web.Response(status=400)

                if not os.path.exists(full_output_folder):
                    os.makedirs(full_output_folder)

                split = os.path.splitext(filename)

                if overwrite is not None and (overwrite == "true" or overwrite == "1"):
                    pass
                else:
                    i = 1
                    while os.path.exists(filepath):
                        if compare_image_hash(filepath, image): #compare hash to prevent saving of duplicates with same name, fix for #3465
                            image_is_duplicate = True
                            break
                        filename = f"{split[0]} ({i}){split[1]}"
                        filepath = os.path.join(full_output_folder, filename)
                        i += 1

                if not image_is_duplicate:
                    if image_save_function is not None:
                        image_save_function(image, post, filepath)
                    else:
                        with open(filepath, "wb") as f:
                            f.write(image.file.read())

                return web.json_response({"name" : filename, "subfolder": subfolder, "type": image_upload_type})
            else:
                return web.Response(status=400)

        @routes.post("/upload/image")
        async def upload_image(request):
            post = await request.post()
            return image_upload(post)


        @routes.post("/upload/mask")
        async def upload_mask(request):
            post = await request.post()

            def image_save_function(image, post, filepath):
                original_ref = json.loads(post.get("original_ref"))
                filename, output_dir = folder_paths.annotated_filepath(original_ref['filename'])

                if not filename:
                    return web.Response(status=400)

                # validation for security: prevent accessing arbitrary path
                if filename[0] == '/' or '..' in filename:
                    return web.Response(status=400)

                if output_dir is None:
                    type = original_ref.get("type", "output")
                    output_dir = folder_paths.get_directory_by_type(type)

                if output_dir is None:
                    return web.Response(status=400)

                if original_ref.get("subfolder", "") != "":
                    full_output_dir = os.path.join(output_dir, original_ref["subfolder"])
                    if os.path.commonpath((os.path.abspath(full_output_dir), output_dir)) != output_dir:
                        return web.Response(status=403)
                    output_dir = full_output_dir

                file = os.path.join(output_dir, filename)

                if os.path.isfile(file):
                    with Image.open(file) as original_pil:
                        metadata = PngInfo()
                        if hasattr(original_pil,'text'):
                            for key in original_pil.text:
                                metadata.add_text(key, original_pil.text[key])
                        original_pil = original_pil.convert('RGBA')
                        mask_pil = Image.open(image.file).convert('RGBA')

                        # alpha copy
                        new_alpha = mask_pil.getchannel('A')
                        original_pil.putalpha(new_alpha)
                        original_pil.save(filepath, compress_level=4, pnginfo=metadata)

            return image_upload(post, image_save_function)

        @routes.get("/view")
        async def view_image(request):
            if "filename" in request.rel_url.query:
                filename = request.rel_url.query["filename"]
                filename, output_dir = folder_paths.annotated_filepath(filename)

                if not filename:
                    return web.Response(status=400)

                # validation for security: prevent accessing arbitrary path
                if filename[0] == '/' or '..' in filename:
                    return web.Response(status=400)

                if output_dir is None:
                    type = request.rel_url.query.get("type", "output")
                    output_dir = folder_paths.get_directory_by_type(type)

                if output_dir is None:
                    return web.Response(status=400)

                if "subfolder" in request.rel_url.query:
                    full_output_dir = os.path.join(output_dir, request.rel_url.query["subfolder"])
                    if os.path.commonpath((os.path.abspath(full_output_dir), output_dir)) != output_dir:
                        return web.Response(status=403)
                    output_dir = full_output_dir

                filename = os.path.basename(filename)
                file = os.path.join(output_dir, filename)

                if os.path.isfile(file):
                    if 'preview' in request.rel_url.query:
                        with Image.open(file) as img:
                            preview_info = request.rel_url.query['preview'].split(';')
                            image_format = preview_info[0]
                            if image_format not in ['webp', 'jpeg'] or 'a' in request.rel_url.query.get('channel', ''):
                                image_format = 'webp'

                            quality = 90
                            if preview_info[-1].isdigit():
                                quality = int(preview_info[-1])

                            buffer = BytesIO()
                            if image_format in ['jpeg'] or request.rel_url.query.get('channel', '') == 'rgb':
                                img = img.convert("RGB")
                            img.save(buffer, format=image_format, quality=quality)
                            buffer.seek(0)

                            return web.Response(body=buffer.read(), content_type=f'image/{image_format}',
                                                headers={"Content-Disposition": f"filename=\"{filename}\""})

                    if 'channel' not in request.rel_url.query:
                        channel = 'rgba'
                    else:
                        channel = request.rel_url.query["channel"]

                    if channel == 'rgb':
                        with Image.open(file) as img:
                            if img.mode == "RGBA":
                                r, g, b, a = img.split()
                                new_img = Image.merge('RGB', (r, g, b))
                            else:
                                new_img = img.convert("RGB")

                            buffer = BytesIO()
                            new_img.save(buffer, format='PNG')
                            buffer.seek(0)

                            return web.Response(body=buffer.read(), content_type='image/png',
                                                headers={"Content-Disposition": f"filename=\"{filename}\""})

                    elif channel == 'a':
                        with Image.open(file) as img:
                            if img.mode == "RGBA":
                                _, _, _, a = img.split()
                            else:
                                a = Image.new('L', img.size, 255)

                            # alpha img
                            alpha_img = Image.new('RGBA', img.size)
                            alpha_img.putalpha(a)
                            alpha_buffer = BytesIO()
                            alpha_img.save(alpha_buffer, format='PNG')
                            alpha_buffer.seek(0)

                            return web.Response(body=alpha_buffer.read(), content_type='image/png',
                                                headers={"Content-Disposition": f"filename=\"{filename}\""})
                    else:
                        # Get content type from mimetype, defaulting to 'application/octet-stream'
                        content_type = mimetypes.guess_type(filename)[0] or 'application/octet-stream'

                        # For security, force certain mimetypes to download instead of display
                        if content_type in {'text/html', 'text/html-sandboxed', 'application/xhtml+xml', 'text/javascript', 'text/css'}:
                            content_type = 'application/octet-stream'  # Forces download

                        return web.FileResponse(
                            file,
                            headers={
                                "Content-Disposition": f"filename=\"{filename}\"",
                                "Content-Type": content_type
                            }
                        )

            return web.Response(status=404)

        @routes.get("/view_metadata/{folder_name}")
        async def view_metadata(request):
            folder_name = request.match_info.get("folder_name", None)
            if folder_name is None:
                return web.Response(status=404)
            if not "filename" in request.rel_url.query:
                return web.Response(status=404)

            filename = request.rel_url.query["filename"]
            if not filename.endswith(".safetensors"):
                return web.Response(status=404)

            safetensors_path = folder_paths.get_full_path(folder_name, filename)
            if safetensors_path is None:
                return web.Response(status=404)
            out = comfy.utils.safetensors_header(safetensors_path, max_size=1024*1024)
            if out is None:
                return web.Response(status=404)
            dt = json.loads(out)
            if not "__metadata__" in dt:
                return web.Response(status=404)
            return web.json_response(dt["__metadata__"])

        @routes.get("/system_stats")
        async def system_stats(request):
            device = comfy.model_management.get_torch_device()
            device_name = comfy.model_management.get_torch_device_name(device)
            cpu_device = comfy.model_management.torch.device("cpu")
            ram_total = comfy.model_management.get_total_memory(cpu_device)
            ram_free = comfy.model_management.get_free_memory(cpu_device)
            vram_total, torch_vram_total = comfy.model_management.get_total_memory(device, torch_total_too=True)
            vram_free, torch_vram_free = comfy.model_management.get_free_memory(device, torch_free_too=True)
            required_frontend_version = FrontendManager.get_required_frontend_version()

            system_stats = {
                "system": {
                    "os": os.name,
                    "ram_total": ram_total,
                    "ram_free": ram_free,
                    "comfyui_version": __version__,
                    "required_frontend_version": required_frontend_version,
                    "python_version": sys.version,
                    "pytorch_version": comfy.model_management.torch_version,
                    "embedded_python": os.path.split(os.path.split(sys.executable)[0])[1] == "python_embeded",
                    "argv": sys.argv
                },
                "devices": [
                    {
                        "name": device_name,
                        "type": device.type,
                        "index": device.index,
                        "vram_total": vram_total,
                        "vram_free": vram_free,
                        "torch_vram_total": torch_vram_total,
                        "torch_vram_free": torch_vram_free,
                    }
                ]
            }
            return web.json_response(system_stats)

        @routes.get("/features")
        async def get_features(request):
            return web.json_response(feature_flags.get_server_features())

        @routes.get("/prompt")
        async def get_prompt(request):
            return web.json_response(self.get_queue_info())

        def node_info(node_class):
            obj_class = nodes.NODE_CLASS_MAPPINGS[node_class]
            if issubclass(obj_class, _ComfyNodeInternal):
                return obj_class.GET_NODE_INFO_V1()
            info = {}
            info['input'] = obj_class.INPUT_TYPES()
            info['input_order'] = {key: list(value.keys()) for (key, value) in obj_class.INPUT_TYPES().items()}
            info['output'] = obj_class.RETURN_TYPES
            info['output_is_list'] = obj_class.OUTPUT_IS_LIST if hasattr(obj_class, 'OUTPUT_IS_LIST') else [False] * len(obj_class.RETURN_TYPES)
            info['output_name'] = obj_class.RETURN_NAMES if hasattr(obj_class, 'RETURN_NAMES') else info['output']
            info['name'] = node_class
            info['display_name'] = nodes.NODE_DISPLAY_NAME_MAPPINGS[node_class] if node_class in nodes.NODE_DISPLAY_NAME_MAPPINGS.keys() else node_class
            info['description'] = obj_class.DESCRIPTION if hasattr(obj_class,'DESCRIPTION') else ''
            info['python_module'] = getattr(obj_class, "RELATIVE_PYTHON_MODULE", "nodes")
            info['category'] = 'sd'
            if hasattr(obj_class, 'OUTPUT_NODE') and obj_class.OUTPUT_NODE == True:
                info['output_node'] = True
            else:
                info['output_node'] = False

            if hasattr(obj_class, 'CATEGORY'):
                info['category'] = obj_class.CATEGORY

            if hasattr(obj_class, 'OUTPUT_TOOLTIPS'):
                info['output_tooltips'] = obj_class.OUTPUT_TOOLTIPS

            if getattr(obj_class, "DEPRECATED", False):
                info['deprecated'] = True
            if getattr(obj_class, "EXPERIMENTAL", False):
                info['experimental'] = True

            if hasattr(obj_class, 'API_NODE'):
                info['api_node'] = obj_class.API_NODE
            return info

        @routes.get("/object_info")
        async def get_object_info(request):
            with folder_paths.cache_helper:
                out = {}
                for x in nodes.NODE_CLASS_MAPPINGS:
                    try:
                        out[x] = node_info(x)
                    except Exception:
                        logging.error(f"[ERROR] An error occurred while retrieving information for the '{x}' node.")
                        logging.error(traceback.format_exc())
                return web.json_response(out)

        @routes.get("/object_info/{node_class}")
        async def get_object_info_node(request):
            node_class = request.match_info.get("node_class", None)
            out = {}
            if (node_class is not None) and (node_class in nodes.NODE_CLASS_MAPPINGS):
                out[node_class] = node_info(node_class)
            return web.json_response(out)

        @routes.get("/history")
        async def get_history(request):
            max_items = request.rel_url.query.get("max_items", None)
            if max_items is not None:
                max_items = int(max_items)
            return web.json_response(self.prompt_queue.get_history(max_items=max_items))

        @routes.get("/history/{prompt_id}")
        async def get_history_prompt_id(request):
            prompt_id = request.match_info.get("prompt_id", None)
            return web.json_response(self.prompt_queue.get_history(prompt_id=prompt_id))

        @routes.get("/queue")
        async def get_queue(request):
            queue_info = {}
            current_queue = self.prompt_queue.get_current_queue_volatile()
            queue_info['queue_running'] = current_queue[0]
            queue_info['queue_pending'] = current_queue[1]
            return web.json_response(queue_info)

        @routes.post("/prompt")
        async def post_prompt(request):
            logging.info("got prompt")
            json_data =  await request.json()
            json_data = self.trigger_on_prompt(json_data)

            if "number" in json_data:
                number = float(json_data['number'])
            else:
                number = self.number
                if "front" in json_data:
                    if json_data['front']:
                        number = -number

                self.number += 1

            if "prompt" in json_data:
                prompt = json_data["prompt"]
                prompt_id = str(json_data.get("prompt_id", uuid.uuid4()))

                partial_execution_targets = None
                if "partial_execution_targets" in json_data:
                    partial_execution_targets = json_data["partial_execution_targets"]

                valid = await execution.validate_prompt(prompt_id, prompt, partial_execution_targets)
                extra_data = {}
                if "extra_data" in json_data:
                    extra_data = json_data["extra_data"]

                if "client_id" in json_data:
                    extra_data["client_id"] = json_data["client_id"]
                if valid[0]:
                    outputs_to_execute = valid[2]
                    self.prompt_queue.put((number, prompt_id, prompt, extra_data, outputs_to_execute))
                    response = {"prompt_id": prompt_id, "number": number, "node_errors": valid[3]}
                    return web.json_response(response)
                else:
                    logging.warning("invalid prompt: {}".format(valid[1]))
                    return web.json_response({"error": valid[1], "node_errors": valid[3]}, status=400)
            else:
                error = {
                    "type": "no_prompt",
                    "message": "No prompt provided",
                    "details": "No prompt provided",
                    "extra_info": {}
                }
                return web.json_response({"error": error, "node_errors": {}}, status=400)

        @routes.post("/queue")
        async def post_queue(request):
            json_data =  await request.json()
            if "clear" in json_data:
                if json_data["clear"]:
                    self.prompt_queue.wipe_queue()
            if "delete" in json_data:
                to_delete = json_data['delete']
                for id_to_delete in to_delete:
                    delete_func = lambda a: a[1] == id_to_delete
                    self.prompt_queue.delete_queue_item(delete_func)

            return web.Response(status=200)

        @routes.post("/interrupt")
        async def post_interrupt(request):
            try:
                json_data = await request.json()
            except json.JSONDecodeError:
                json_data = {}

            # Check if a specific prompt_id was provided for targeted interruption
            prompt_id = json_data.get('prompt_id')
            if prompt_id:
                currently_running, _ = self.prompt_queue.get_current_queue()

                # Check if the prompt_id matches any currently running prompt
                should_interrupt = False
                for item in currently_running:
                    # item structure: (number, prompt_id, prompt, extra_data, outputs_to_execute)
                    if item[1] == prompt_id:
                        logging.info(f"Interrupting prompt {prompt_id}")
                        should_interrupt = True
                        break

                if should_interrupt:
                    nodes.interrupt_processing()
                else:
                    logging.info(f"Prompt {prompt_id} is not currently running, skipping interrupt")
            else:
                # No prompt_id provided, do a global interrupt
                logging.info("Global interrupt (no prompt_id specified)")
                nodes.interrupt_processing()

            return web.Response(status=200)

        @routes.post("/free")
        async def post_free(request):
            json_data = await request.json()
            unload_models = json_data.get("unload_models", False)
            free_memory = json_data.get("free_memory", False)
            if unload_models:
                self.prompt_queue.set_flag("unload_models", unload_models)
            if free_memory:
                self.prompt_queue.set_flag("free_memory", free_memory)
            return web.Response(status=200)

        @routes.post("/history")
        async def post_history(request):
            json_data =  await request.json()
            if "clear" in json_data:
                if json_data["clear"]:
                    self.prompt_queue.wipe_history()
            if "delete" in json_data:
                to_delete = json_data['delete']
                for id_to_delete in to_delete:
                    self.prompt_queue.delete_history_item(id_to_delete)

            return web.Response(status=200)

    async def setup(self):
        timeout = aiohttp.ClientTimeout(total=None) # no timeout
        self.client_session = aiohttp.ClientSession(timeout=timeout)

    def add_routes(self):
        self.user_manager.add_routes(self.routes)
        self.model_file_manager.add_routes(self.routes)
        self.custom_node_manager.add_routes(self.routes, self.app, nodes.LOADED_MODULE_DIRS.items())
        self.app.add_subapp('/internal', self.internal_routes.get_app())

        # Prefix every route with /api for easier matching for delegation.
        # This is very useful for frontend dev server, which need to forward
        # everything except serving of static files.
        # Currently both the old endpoints without prefix and new endpoints with
        # prefix are supported.
        api_routes = web.RouteTableDef()
        for route in self.routes:
            # Custom nodes might add extra static routes. Only process non-static
            # routes to add /api prefix.
            if isinstance(route, web.RouteDef):
                api_routes.route(route.method, "/api" + route.path)(route.handler, **route.kwargs)
        self.app.add_routes(api_routes)
        self.app.add_routes(self.routes)

        # Add routes from web extensions.
        for name, dir in nodes.EXTENSION_WEB_DIRS.items():
            self.app.add_routes([web.static('/extensions/' + name, dir)])

        workflow_templates_path = FrontendManager.templates_path()
        if workflow_templates_path:
            self.app.add_routes([
                web.static('/templates', workflow_templates_path)
            ])

        # Serve embedded documentation from the package
        embedded_docs_path = FrontendManager.embedded_docs_path()
        if embedded_docs_path:
            self.app.add_routes([
                web.static('/docs', embedded_docs_path)
            ])

        self.app.add_routes([
            web.static('/', self.web_root),
        ])

    def get_queue_info(self):
        prompt_info = {}
        exec_info = {}
        exec_info['queue_remaining'] = self.prompt_queue.get_tasks_remaining()
        prompt_info['exec_info'] = exec_info
        return prompt_info

    async def send(self, event, data, sid=None):
        if event == BinaryEventTypes.UNENCODED_PREVIEW_IMAGE:
            await self.send_image(data, sid=sid)
        elif event == BinaryEventTypes.PREVIEW_IMAGE_WITH_METADATA:
            # data is (preview_image, metadata)
            preview_image, metadata = data
            await self.send_image_with_metadata(preview_image, metadata, sid=sid)
        elif isinstance(data, (bytes, bytearray)):
            await self.send_bytes(event, data, sid)
        else:
            await self.send_json(event, data, sid)

    def encode_bytes(self, event, data):
        if not isinstance(event, int):
            raise RuntimeError(f"Binary event types must be integers, got {event}")

        packed = struct.pack(">I", event)
        message = bytearray(packed)
        message.extend(data)
        return message

    async def send_image(self, image_data, sid=None):
        image_type = image_data[0]
        image = image_data[1]
        max_size = image_data[2]
        if max_size is not None:
            if hasattr(Image, 'Resampling'):
                resampling = Image.Resampling.BILINEAR
            else:
                resampling = Image.Resampling.LANCZOS

            image = ImageOps.contain(image, (max_size, max_size), resampling)
        type_num = 1
        if image_type == "JPEG":
            type_num = 1
        elif image_type == "PNG":
            type_num = 2

        bytesIO = BytesIO()
        header = struct.pack(">I", type_num)
        bytesIO.write(header)
        image.save(bytesIO, format=image_type, quality=95, compress_level=1)
        preview_bytes = bytesIO.getvalue()
        await self.send_bytes(BinaryEventTypes.PREVIEW_IMAGE, preview_bytes, sid=sid)

    async def send_image_with_metadata(self, image_data, metadata=None, sid=None):
        image_type = image_data[0]
        image = image_data[1]
        max_size = image_data[2]
        if max_size is not None:
            if hasattr(Image, 'Resampling'):
                resampling = Image.Resampling.BILINEAR
            else:
                resampling = Image.Resampling.LANCZOS

            image = ImageOps.contain(image, (max_size, max_size), resampling)

        mimetype = "image/png" if image_type == "PNG" else "image/jpeg"

        # Prepare metadata
        if metadata is None:
            metadata = {}
        metadata["image_type"] = mimetype

        # Serialize metadata as JSON
        import json
        metadata_json = json.dumps(metadata).encode('utf-8')
        metadata_length = len(metadata_json)

        # Prepare image data
        bytesIO = BytesIO()
        image.save(bytesIO, format=image_type, quality=95, compress_level=1)
        image_bytes = bytesIO.getvalue()

        # Combine metadata and image
        combined_data = bytearray()
        combined_data.extend(struct.pack(">I", metadata_length))
        combined_data.extend(metadata_json)
        combined_data.extend(image_bytes)

        await self.send_bytes(BinaryEventTypes.PREVIEW_IMAGE_WITH_METADATA, combined_data, sid=sid)

    async def send_bytes(self, event, data, sid=None):
        message = self.encode_bytes(event, data)

        if sid is None:
            sockets = list(self.sockets.values())
            for ws in sockets:
                await send_socket_catch_exception(ws.send_bytes, message)
        elif sid in self.sockets:
            await send_socket_catch_exception(self.sockets[sid].send_bytes, message)

    async def send_json(self, event, data, sid=None):
        message = {"type": event, "data": data}

        if sid is None:
            sockets = list(self.sockets.values())
            for ws in sockets:
                await send_socket_catch_exception(ws.send_json, message)
        elif sid in self.sockets:
            await send_socket_catch_exception(self.sockets[sid].send_json, message)

    def send_sync(self, event, data, sid=None):
        self.loop.call_soon_threadsafe(
            self.messages.put_nowait, (event, data, sid))

    def queue_updated(self):
        self.send_sync("status", { "status": self.get_queue_info() })

    async def publish_loop(self):
        while True:
            msg = await self.messages.get()
            await self.send(*msg)

    async def start(self, address, port, verbose=True, call_on_start=None):
        await self.start_multi_address([(address, port)], call_on_start=call_on_start)

    async def start_multi_address(self, addresses, call_on_start=None, verbose=True):
        runner = web.AppRunner(self.app, access_log=None)
        await runner.setup()
        ssl_ctx = None
        scheme = "http"
        if args.tls_keyfile and args.tls_certfile:
            ssl_ctx = ssl.SSLContext(protocol=ssl.PROTOCOL_TLS_SERVER, verify_mode=ssl.CERT_NONE)
            ssl_ctx.load_cert_chain(certfile=args.tls_certfile,
                                keyfile=args.tls_keyfile)
            scheme = "https"

        if verbose:
            logging.info("Starting server\n")
        for addr in addresses:
            address = addr[0]
            port = addr[1]
            site = web.TCPSite(runner, address, port, ssl_context=ssl_ctx)
            await site.start()

            if not hasattr(self, 'address'):
                self.address = address #TODO: remove this
                self.port = port

            if ':' in address:
                address_print = "[{}]".format(address)
            else:
                address_print = address

            if verbose:
                logging.info("To see the GUI go to: {}://{}:{}".format(scheme, address_print, port))

        if call_on_start is not None:
            call_on_start(scheme, self.address, self.port)

    def add_on_prompt_handler(self, handler):
        self.on_prompt_handlers.append(handler)

    def trigger_on_prompt(self, json_data):
        for handler in self.on_prompt_handlers:
            try:
                json_data = handler(json_data)
            except Exception:
                logging.warning("[ERROR] An error occurred during the on_prompt_handler processing")
                logging.warning(traceback.format_exc())

        return json_data

    def send_progress_text(
        self, text: Union[bytes, bytearray, str], node_id: str, sid=None
    ):
        if isinstance(text, str):
            text = text.encode("utf-8")
        node_id_bytes = str(node_id).encode("utf-8")

        # Pack the node_id length as a 4-byte unsigned integer, followed by the node_id bytes
        message = struct.pack(">I", len(node_id_bytes)) + node_id_bytes + text

        self.send_sync(BinaryEventTypes.TEXT, message, sid)