app.py

######
# Project       : GPT4ALL-UI
# Author        : ParisNeo with the help of the community
# Supported by Nomic-AI
# Licence       : Apache 2.0
# Description   : 
# A front end Flask application for llamacpp models.
# The official GPT4All Web ui
# Made by the community for the community
######

__author__ = "parisneo"
__github__ = "https://github.com/nomic-ai/gpt4all-ui"
__copyright__ = "Copyright 2023, "
__license__ = "Apache 2.0"

import os
import logging
import argparse
import json
import re
import traceback
import sys
from tqdm import tqdm
from pyaipersonality import AIPersonality
from gpt4all_api.db import DiscussionsDB, Discussion
from flask import (
    Flask,
    Response,
    jsonify,
    render_template,
    request,
    stream_with_context,
    send_from_directory
)
from flask_socketio import SocketIO, emit
from pathlib import Path
import gc
from geventwebsocket.handler import WebSocketHandler
from gevent.pywsgi import WSGIServer
import requests
from concurrent.futures import ThreadPoolExecutor, as_completed
import logging
log = logging.getLogger('werkzeug')
log.setLevel(logging.ERROR)

app = Flask("GPT4All-WebUI", static_url_path="/static", static_folder="static")
socketio = SocketIO(app,  cors_allowed_origins="*", async_mode='gevent', ping_timeout=60, ping_interval=15)

app.config['SECRET_KEY'] = 'secret!'
# Set the logging level to WARNING or higher
logging.getLogger('socketio').setLevel(logging.WARNING)
logging.getLogger('engineio').setLevel(logging.WARNING)
# Suppress Flask's default console output
log = logging.getLogger('werkzeug')
log.setLevel(logging.ERROR)

import time
from gpt4all_api.config import load_config, save_config
from gpt4all_api.api import GPT4AllAPI
import shutil
import markdown


class Gpt4AllWebUI(GPT4AllAPI):
    def __init__(self, _app, _socketio, config:dict, config_file_path) -> None:
        super().__init__(config, _socketio, config_file_path)

        self.app = _app
        self.cancel_gen = False
        

        if "use_new_ui" in self.config:
            if self.config["use_new_ui"]:
                app.template_folder = "web/dist"


        # =========================================================================================
        # Endpoints
        # =========================================================================================


        self.add_endpoint(
            "/list_backends", "list_backends", self.list_backends, methods=["GET"]
        )
        self.add_endpoint(
            "/list_models", "list_models", self.list_models, methods=["GET"]
        )
        self.add_endpoint(
            "/list_personalities_languages", "list_personalities_languages", self.list_personalities_languages, methods=["GET"]
        )        
        self.add_endpoint(
            "/list_personalities_categories", "list_personalities_categories", self.list_personalities_categories, methods=["GET"]
        )
        self.add_endpoint(
            "/list_personalities", "list_personalities", self.list_personalities, methods=["GET"]
        )

        self.add_endpoint(
            "/list_languages", "list_languages", self.list_languages, methods=["GET"]
        )
        
        self.add_endpoint(
            "/list_discussions", "list_discussions", self.list_discussions, methods=["GET"]
        )
        
        self.add_endpoint("/set_personality_language", "set_personality_language", self.set_personality_language, methods=["GET"])
        self.add_endpoint("/set_personality_category", "set_personality_category", self.set_personality_category, methods=["GET"])
        
        
        self.add_endpoint("/", "", self.index, methods=["GET"])
        self.add_endpoint("/<path:filename>", "serve_static", self.serve_static, methods=["GET"])
        self.add_endpoint("/personalities/<path:filename>", "serve_personalities", self.serve_personalities, methods=["GET"])

        
        self.add_endpoint("/export_discussion", "export_discussion", self.export_discussion, methods=["GET"])
        self.add_endpoint("/export", "export", self.export, methods=["GET"])
        self.add_endpoint(
            "/new_discussion", "new_discussion", self.new_discussion, methods=["GET"]
        )
        self.add_endpoint("/stop_gen", "stop_gen", self.stop_gen, methods=["GET"])

        self.add_endpoint("/rename", "rename", self.rename, methods=["POST"])
        self.add_endpoint("/edit_title", "edit_title", self.edit_title, methods=["POST"])
        self.add_endpoint(
            "/load_discussion", "load_discussion", self.load_discussion, methods=["POST"]
        )
        self.add_endpoint(
            "/delete_discussion",
            "delete_discussion",
            self.delete_discussion,
            methods=["POST"],
        )

        self.add_endpoint(
            "/update_message", "update_message", self.update_message, methods=["GET"]
        )
        self.add_endpoint(
            "/message_rank_up", "message_rank_up", self.message_rank_up, methods=["GET"]
        )
        self.add_endpoint(
            "/message_rank_down", "message_rank_down", self.message_rank_down, methods=["GET"]
        )
        self.add_endpoint(
            "/delete_message", "delete_message", self.delete_message, methods=["GET"]
        )
        
        self.add_endpoint(
            "/set_backend", "set_backend", self.set_backend, methods=["POST"]
        )
        
        self.add_endpoint(
            "/set_model", "set_model", self.set_model, methods=["POST"]
        )
        
        self.add_endpoint(
            "/update_model_params", "update_model_params", self.update_model_params, methods=["POST"]
        )

        self.add_endpoint(
            "/get_config", "get_config", self.get_config, methods=["GET"]
        )
        
        self.add_endpoint(
            "/get_available_models", "get_available_models", self.get_available_models, methods=["GET"]
        )


        self.add_endpoint(
            "/extensions", "extensions", self.extensions, methods=["GET"]
        )

        self.add_endpoint(
            "/training", "training", self.training, methods=["GET"]
        )
        self.add_endpoint(
            "/main", "main", self.main, methods=["GET"]
        )
        
        self.add_endpoint(
            "/settings", "settings", self.settings, methods=["GET"]
        )

        self.add_endpoint(
            "/help", "help", self.help, methods=["GET"]
        )
        
        self.add_endpoint(
            "/get_generation_status", "get_generation_status", self.get_generation_status, methods=["GET"]
        )
        
        self.add_endpoint(
            "/update_setting", "update_setting", self.update_setting, methods=["POST"]
        )

        self.add_endpoint(
            "/save_settings", "save_settings", self.save_settings, methods=["POST"]
        )

        self.add_endpoint(
            "/get_current_personality", "get_current_personality", self.get_current_personality, methods=["GET"]
        )
        


    def save_settings(self):
        save_config(self.config, self.config_file_path)
        if self.config["debug"]:
            print("Configuration saved")
        # Tell that the setting was changed
        self.socketio.emit('save_settings', {"status":True})
        return jsonify({"status":True})
    

    def get_current_personality(self):
        return jsonify({"personality":self.personality.as_dict()})
    
    

    # Settings (data: {"setting_name":<the setting name>,"setting_value":<the setting value>})
    def update_setting(self):
        data = request.get_json()
        setting_name = data['setting_name']
        if setting_name== "temperature":
            self.config["temperature"]=float(data['setting_value'])
        elif setting_name== "n_predict":
            self.config["n_predict"]=int(data['setting_value'])
        elif setting_name== "top_k":
            self.config["top_k"]=int(data['setting_value'])
        elif setting_name== "top_p":
            self.config["top_p"]=float(data['setting_value'])
            
        elif setting_name== "repeat_penalty":
            self.config["repeat_penalty"]=float(data['setting_value'])
        elif setting_name== "repeat_last_n":
            self.config["repeat_last_n"]=int(data['setting_value'])

        elif setting_name== "n_threads":
            self.config["n_threads"]=int(data['setting_value'])
        elif setting_name== "ctx_size":
            self.config["ctx_size"]=int(data['setting_value'])


        elif setting_name== "language":
            self.config["language"]=data['setting_value']

        elif setting_name== "personality_language":
            back_language = self.config["personality_language"]
            if self.config["personality_language"]!=data['setting_value']:
                self.config["personality_language"]=data['setting_value']
                cats = self.list_personalities_categories()
                if len(cats)>0:
                    back_category = self.config["personality_category"]
                    self.config["personality_category"]=cats[0]
                    pers = json.loads(self.list_personalities().data.decode("utf8"))
                    if len(pers)>0:
                        self.config["personality"]=pers[0]
                        personality_fn = f"personalities/{self.config['personality_language']}/{self.config['personality_category']}/{self.config['personality']}"
                        self.personality.load_personality(personality_fn)
                    else:
                        self.config["personality_language"]=back_language
                        self.config["personality_category"]=back_category
                        return jsonify({'setting_name': data['setting_name'], "status":False})
                else:
                    self.config["personality_language"]=back_language
                    return jsonify({'setting_name': data['setting_name'], "status":False})
                
        elif setting_name== "personality_category":
            back_category = self.config["personality_category"]
            if self.config["personality_category"]!=data['setting_value']:
                self.config["personality_category"]=data['setting_value']
                pers = json.loads(self.list_personalities().data.decode("utf8"))
                if len(pers)>0:
                    self.config["personality"]=pers[0]
                    personality_fn = f"personalities/{self.config['personality_language']}/{self.config['personality_category']}/{self.config['personality']}"
                    self.personality.load_personality(personality_fn)
                    if self.config["debug"]:
                        print(self.personality)
                else:
                    self.config["personality_category"]=back_category
                    return jsonify({'setting_name': data['setting_name'], "status":False})

        elif setting_name== "personality":
            self.config["personality"]=data['setting_value']
            personality_fn = f"personalities/{self.config['personality_language']}/{self.config['personality_category']}/{self.config['personality']}"
            self.personality.load_personality(personality_fn)
        elif setting_name== "override_personality_model_parameters":
            self.config["override_personality_model_parameters"]=bool(data['setting_value'])
            
            


        elif setting_name== "model":
            self.config["model"]=data['setting_value']
            print("update_settings : New model selected")            
            # Build chatbot
            self.process.set_config(self.config)

        elif setting_name== "backend":
            print("New backend selected")            
            if self.config['backend']!= data['setting_value']:
                print("New backend selected")
                self.config["backend"]=data['setting_value']
                
                backend_ =self.process.rebuild_backend(self.config)
                models = backend_.list_models(self.config)
                if len(models)>0:      
                    self.backend = backend_
                    self.config['model'] = models[0]
                    # Build chatbot
                    self.process.set_config(self.config)
                    if self.config["debug"]:
                        print(f"Configuration {data['setting_name']} set to {data['setting_value']}")
                    return jsonify({'setting_name': data['setting_name'], "status":True})
                else:
                    if self.config["debug"]:
                        print(f"Configuration {data['setting_name']} couldn't be set to {data['setting_value']}")
                    return jsonify({'setting_name': data['setting_name'], "status":False})
            else:
                if self.config["debug"]:
                    print(f"Configuration {data['setting_name']} set to {data['setting_value']}")
                return jsonify({'setting_name': data['setting_name'], "status":True})

        else:
            if self.config["debug"]:
                print(f"Configuration {data['setting_name']} couldn't be set to {data['setting_value']}")
            return jsonify({'setting_name': data['setting_name'], "status":False})

        if self.config["debug"]:
            print(f"Configuration {data['setting_name']} set to {data['setting_value']}")
            
        print("Configuration updated")
        self.process.set_config(self.config)
        # Tell that the setting was changed
        return jsonify({'setting_name': data['setting_name'], "status":True})

    def list_backends(self):
        backends_dir = Path('./backends')  # replace with the actual path to the models folder
        backends = [f.stem for f in backends_dir.iterdir() if f.is_dir() and f.stem!="__pycache__"]
        return jsonify(backends)


    def list_models(self):
        if self.backend is not None:
            models = self.backend.list_models(self.config)
            return jsonify(models)
        else:
            return jsonify([])
    

    def list_personalities_languages(self):
        personalities_languages_dir = Path(f'./personalities')  # replace with the actual path to the models folder
        personalities_languages = [f.stem for f in personalities_languages_dir.iterdir() if f.is_dir()]
        return jsonify(personalities_languages)

    def list_personalities_categories(self):
        personalities_categories_dir = Path(f'./personalities/{self.config["personality_language"]}')  # replace with the actual path to the models folder
        personalities_categories = [f.stem for f in personalities_categories_dir.iterdir() if f.is_dir()]
        return jsonify(personalities_categories)
    
    def list_personalities(self):
        try:
            personalities_dir = Path(f'./personalities/{self.config["personality_language"]}/{self.config["personality_category"]}')  # replace with the actual path to the models folder
            personalities = [f.stem for f in personalities_dir.iterdir() if f.is_dir()]
        except Exception as ex:
            personalities=[]
            if self.config["debug"]:
                print(f"No personalities found. Using default one {ex}")
        return jsonify(personalities)

    def list_languages(self):
        lanuguages= [
        { "value": "en-US", "label": "English" },
        { "value": "fr-FR", "label": "Français" },
        { "value": "ar-AR", "label": "العربية" },
        { "value": "it-IT", "label": "Italiano" },
        { "value": "de-DE", "label": "Deutsch" },
        { "value": "nl-XX", "label": "Dutch" },
        { "value": "zh-CN", "label": "中國人" }
        ]
        return jsonify(lanuguages)


    def list_discussions(self):
        discussions = self.db.get_discussions()
        return jsonify(discussions)


    def set_personality_language(self):
        lang = request.args.get('language')
        self.config['personality_language'] = lang
        return jsonify({'success':True})

    def set_personality_category(self):
        category = request.args.get('category')
        self.config['personality_category'] = category
        return jsonify({'success':True})

    def add_endpoint(
        self,
        endpoint=None,
        endpoint_name=None,
        handler=None,
        methods=["GET"],
        *args,
        **kwargs,
    ):
        self.app.add_url_rule(
            endpoint, endpoint_name, handler, methods=methods, *args, **kwargs
        )

    def index(self):
        return render_template("index.html")
    
    def serve_static(self, filename):
        root_dir = os.getcwd()
        if "use_new_ui" in self.config:
            if self.config["use_new_ui"]:
                path = os.path.join(root_dir, 'web/dist/')+"/".join(filename.split("/")[:-1])
            else:
                path = os.path.join(root_dir, 'static/')+"/".join(filename.split("/")[:-1])
        else:
            path = os.path.join(root_dir, 'static/')+"/".join(filename.split("/")[:-1])
                            
        fn = filename.split("/")[-1]
        return send_from_directory(path, fn)

    def serve_personalities(self, filename):
        root_dir = os.getcwd()
        path = os.path.join(root_dir, 'personalities/')+"/".join(filename.split("/")[:-1])
                            
        fn = filename.split("/")[-1]
        return send_from_directory(path, fn)

    def export(self):
        return jsonify(self.db.export_to_json())

    def export_discussion(self):
        return jsonify({"discussion_text":self.get_discussion_to()})
    

            
    def get_generation_status(self):
        return jsonify({"status":self.process.is_generating.value==1}) 
    
    def stop_gen(self):
        self.cancel_gen = True
        print("Stop generation received")
        return jsonify({"status": "ok"})         

           
    def rename(self):
        data = request.get_json()
        title = data["title"]
        self.current_discussion.rename(title)
        return "renamed successfully"
    
    def edit_title(self):
        data = request.get_json()
        title = data["title"]
        discussion_id = data["id"]
        self.current_discussion = Discussion(discussion_id, self.db)
        self.current_discussion.rename(title)
        return "title renamed successfully"
    
    def load_discussion(self):
        data = request.get_json()
        if "id" in data:
            discussion_id = data["id"]
            self.current_discussion = Discussion(discussion_id, self.db)
        else:
            if self.current_discussion is not None:
                discussion_id = self.current_discussion.discussion_id
                self.current_discussion = Discussion(discussion_id, self.db)
            else:
                self.current_discussion = self.db.create_discussion()
        messages = self.current_discussion.get_messages()
        #for message in messages:
        #    message["content"] =  markdown.markdown(message["content"])
        
        return jsonify(messages), {'Content-Type': 'application/json; charset=utf-8'}

    def delete_discussion(self):
        data = request.get_json()
        discussion_id = data["id"]
        self.current_discussion = Discussion(discussion_id, self.db)
        self.current_discussion.delete_discussion()
        self.current_discussion = None
        return jsonify({})

    def update_message(self):
        discussion_id = request.args.get("id")
        new_message = request.args.get("message")
        self.current_discussion.update_message(discussion_id, new_message)
        return jsonify({"status": "ok"})

    def message_rank_up(self):
        discussion_id = request.args.get("id")
        new_rank = self.current_discussion.message_rank_up(discussion_id)
        return jsonify({"new_rank": new_rank})

    def message_rank_down(self):
        discussion_id = request.args.get("id")
        new_rank = self.current_discussion.message_rank_down(discussion_id)
        return jsonify({"new_rank": new_rank})

    def delete_message(self):
        discussion_id = request.args.get("id")
        if self.current_discussion is None:
            return jsonify({"status": False,"message":"No discussion is selected"})
        else:
            new_rank = self.current_discussion.delete_message(discussion_id)
            return jsonify({"status":True,"new_rank": new_rank})


    def new_discussion(self):
        title = request.args.get("title")
        timestamp = self.create_new_discussion(title)
        
        # Return a success response
        return json.dumps({"id": self.current_discussion.discussion_id, "time": timestamp, "welcome_message":self.personality.welcome_message, "sender":self.personality.name})

    def set_backend(self):
        data = request.get_json()
        backend =  str(data["backend"])
        if self.config['backend']!= backend:
            print("New backend selected")
            
            self.config['backend'] = backend
            backend_ =self.process.load_backend(Path("backends")/config["backend"])
            models = backend_.list_models(self.config)
            if len(models)>0:      
                self.backend = backend_
                self.config['model'] = models[0]
                # Build chatbot
                self.process.set_config(self.config)
                return jsonify({"status": "ok"})
            else:
                return jsonify({"status": "no_models_found"})

        return jsonify({"status": "error"})

    def set_model(self):
        data = request.get_json()
        model =  str(data["model"])
        if self.config['model']!= model:
            print("set_model: New model selected")            
            self.config['model'] = model
            # Build chatbot
            self.process.set_config(self.config)
            return jsonify({"status": "ok"})

        return jsonify({"status": "error"})    
    
    def update_model_params(self):
        data = request.get_json()
        backend =  str(data["backend"])
        model =  str(data["model"])
        personality_language =  str(data["personality_language"])
        personality_category =  str(data["personality_category"])
        personality =  str(data["personality"])
        
        if self.config['backend']!=backend or  self.config['model'] != model:
            print("update_model_params: New model selected")
            
            self.config['backend'] = backend
            self.config['model'] = model
            self.process.set_config(self.config)

        self.config['personality_language'] = personality_language
        self.config['personality_category'] = personality_category
        self.config['personality'] = personality

        personality_fn = f"personalities/{self.config['personality_language']}/{self.config['personality_category']}/{self.config['personality']}"
        print(f"Loading personality : {personality_fn}")

        self.config['n_predict'] = int(data["nPredict"])
        self.config['seed'] = int(data["seed"])
        self.config['model'] = str(data["model"])
        self.config['voice'] = str(data["voice"])
        self.config['language'] = str(data["language"])
        
        self.config['temperature'] = float(data["temperature"])
        self.config['top_k'] = int(data["topK"])
        self.config['top_p'] = float(data["topP"])
        self.config['repeat_penalty'] = float(data["repeatPenalty"])
        self.config['repeat_last_n'] = int(data["repeatLastN"])

        save_config(self.config, self.config_file_path)
        
        self.process.set_config(self.config)
        # Fixed missing argument
        self.backend = self.process.rebuild_backend(self.config)

        print("==============================================")
        print("Parameters changed to:")
        print(f"\tBackend:{self.config['backend']}")
        print(f"\tModel:{self.config['model']}")
        print(f"\tPersonality language:{self.config['personality_language']}")
        print(f"\tPersonality category:{self.config['personality_category']}")
        print(f"\tPersonality:{self.config['personality']}")
        print(f"\tLanguage:{self.config['language']}")
        print(f"\tVoice:{self.config['voice']}")
        print(f"\tTemperature:{self.config['temperature']}")
        print(f"\tNPredict:{self.config['n_predict']}")
        print(f"\tSeed:{self.config['seed']}")
        print(f"\top_k:{self.config['top_k']}")
        print(f"\top_p:{self.config['top_p']}")
        print(f"\trepeat_penalty:{self.config['repeat_penalty']}")
        print(f"\trepeat_last_n:{self.config['repeat_last_n']}")
        print("==============================================")

        return jsonify({"status":"ok"})
    
    
    def get_available_models(self):
        """Get the available models

        Returns:
            _type_: _description_
        """
        
        model_list = self.backend.get_available_models()

        models = []
        for model in model_list:
            try:
                filename = model['filename']
                server = model['server']
                filesize = model['filesize']
                if server.endswith("/"):
                    path = f'{server}{filename}'
                else:
                    path = f'{server}/{filename}'
                local_path = Path(f'./models/{self.config["backend"]}/{filename}')
                is_installed = local_path.exists()
                models.append({
                    'title': model['filename'],
                    'icon': '/icons/default.png',  # Replace with the path to the model icon
                    'description': model['description'],
                    'isInstalled': is_installed,
                    'path': path,
                    'filesize': filesize,
                })
            except:
                print(f"Problem with model : {model}")
        return jsonify(models)

    
    def get_config(self):
        return jsonify(self.config)

    def main(self):
        return render_template("main.html")
    
    def settings(self):
        return render_template("settings.html")

    def help(self):
        return render_template("help.html")
    
    def training(self):
        return render_template("training.html")

    def extensions(self):
        return render_template("extensions.html")

    

if __name__ == "__main__":
    parser = argparse.ArgumentParser(description="Start the chatbot Flask app.")
    parser.add_argument(
        "-c", "--config", type=str, default="default", help="Sets the configuration file to be used."
    )

    parser.add_argument(
        "-p", "--personality", type=str, default=None, help="Selects the personality to be using."
    )

    parser.add_argument(
        "-s", "--seed", type=int, default=None, help="Force using a specific seed value."
    )

    parser.add_argument(
        "-m", "--model", type=str, default=None, help="Force using a specific model."
    )
    parser.add_argument(
        "--temp", type=float, default=None, help="Temperature parameter for the model."
    )
    parser.add_argument(
        "--n_predict",
        type=int,
        default=None,
        help="Number of tokens to predict at each step.",
    )
    parser.add_argument(
        "--n_threads",
        type=int,
        default=None,
        help="Number of threads to use.",
    )
    parser.add_argument(
        "--top_k", type=int, default=None, help="Value for the top-k sampling."
    )
    parser.add_argument(
        "--top_p", type=float, default=None, help="Value for the top-p sampling."
    )
    parser.add_argument(
        "--repeat_penalty", type=float, default=None, help="Penalty for repeated tokens."
    )
    parser.add_argument(
        "--repeat_last_n",
        type=int,
        default=None,
        help="Number of previous tokens to consider for the repeat penalty.",
    )
    parser.add_argument(
        "--ctx_size",
        type=int,
        default=None,#2048,
        help="Size of the context window for the model.",
    )
    parser.add_argument(
        "--debug",
        dest="debug",
        action="store_true",
        default=None,
        help="launch Flask server in debug mode",
    )
    parser.add_argument(
        "--host", type=str, default=None, help="the hostname to listen on"
    )
    parser.add_argument("--port", type=int, default=None, help="the port to listen on")
    parser.add_argument(
        "--db_path", type=str, default=None, help="Database path"
    )
    args = parser.parse_args()

    # The default configuration must be kept unchanged as it is committed to the repository, 
    # so we have to make a copy that is not comitted
    default_config = load_config(f"configs/default.yaml")

    if args.config=="default":
        args.config = "local_default"
        if not Path(f"configs/local_default.yaml").exists():
            print("No local configuration file found. Building from scratch")
            shutil.copy(f"configs/default.yaml", f"configs/local_default.yaml")

    config_file_path = f"configs/{args.config}.yaml"
    config = load_config(config_file_path)

    if "version" not in config or int(config["version"])<int(default_config["version"]):
        #Upgrade old configuration files to new format
        print("Configuration file is very old. Replacing with default configuration")
        for key, value in default_config.items():
            if key not in config:
                config[key] = value
        config["version"]=int(default_config["version"])
        save_config(config, config_file_path)

    # Override values in config with command-line arguments
    for arg_name, arg_value in vars(args).items():
        if arg_value is not None:
            config[arg_name] = arg_value

    # executor = ThreadPoolExecutor(max_workers=1)
    # app.config['executor'] = executor
    bot = Gpt4AllWebUI(app, socketio, config, config_file_path)

    # chong Define custom WebSocketHandler with error handling 
    class CustomWebSocketHandler(WebSocketHandler):
        def handle_error(self, environ, start_response, e):
            # Handle the error here
            print("WebSocket error:", e)
            super().handle_error(environ, start_response, e)
    
    url = f'http://{config["host"]}:{config["port"]}'
    
    print(f"Please open your browser and go to {url} to view the ui")

    # chong -add socket server    
    app.config['debug'] = config["debug"]

    if config["debug"]:
        print("debug mode:true")    
    else:
        print("debug mode:false")
        
    http_server = WSGIServer((config["host"], config["port"]), app, handler_class=WebSocketHandler)
    http_server.serve_forever()