Simple online chat on Python in less than 100 lines of code

pywebio_online_chat.py

import asyncio

from pywebio import start_server
from pywebio.input import *
from pywebio.output import *
from pywebio.session import defer_call, info as session_info, run_async, run_js

chat_msgs = []
online_users = set()

MAX_MESSAGES_COUNT = 100

async def main():
    global chat_msgs

    put_markdown("## 🧊 Online çata xoş gəlmisiz!\nÇatda maksimum 100 mesaj saxlanılır!")

    msg_box = output()
    put_scrollable(msg_box, height=300, keep_bottom=True)

    nickname = await input("Çata daxil olun", required=True, placeholder="Adınız", validate=lambda n: "Bu ad artıq istifadə olunub!" if n in online_users or n == '📢' else None)
    online_users.add(nickname)

    chat_msgs.append(('📢', f'`{nickname}` çata qoşuldu!'))
    msg_box.append(put_markdown(f'📢 `{nickname}` çata qoşuldu'))

    refresh_task = run_async(refresh_msg(nickname, msg_box))

    while True:
        data = await input_group("💭 Yeni mesaj", [
            input(placeholder="Mesajın mətni ...", name="msg"),
            actions(name="cmd", buttons=["Göndər", {'label': "Çatdan çıxış", 'type': 'cancel'}])
        ], validate = lambda m: ('msg', "Mesajın mətnini daxil edin!") if m["cmd"] == "Göndər" and not m['msg'] else None)

        if data is None:
            break

        msg_box.append(put_markdown(f"`{nickname}`: {data['msg']}"))
        chat_msgs.append((nickname, data['msg']))

    refresh_task.close()

    online_users.remove(nickname)
    toast("Çatdan çıxdınız!")
    msg_box.append(put_markdown(f'📢 `{nickname}` çatdan çıxdı!'))
    chat_msgs.append(('📢', f'📢 `{nickname}` çatdan çıxdı!'))

    put_buttons(['Təkrar daxil ol'], onclick=lambda btn:run_js('window.location.reload()'))

async def refresh_msg(nickname, msg_box):
    global chat_msgs
    last_idx = len(chat_msgs)

    while True:
        await asyncio.sleep(1)

        for m in chat_msgs[last_idx:]:
            if m[0] != nickname: # if not a message from current user
                msg_box.append(put_markdown(f"`{m[0]}`: {m[1]}"))

        # remove expired
        if len(chat_msgs) > MAX_MESSAGES_COUNT:
            chat_msgs = chat_msgs[len(chat_msgs) // 2:]

        last_idx = len(chat_msgs)

if __name__ == "__main__":
    start_server(main, debug=True, port=8080, cdn=False)

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