Update

examples/asynchronous_telebot/middleware/flooding_middleware.py

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+# Just a little example of middleware handlers
+
+import telebot
+from telebot.asyncio_handler_backends import BaseMiddleware
+from telebot.async_telebot import AsyncTeleBot
+from telebot.async_telebot import CancelUpdate
+bot = AsyncTeleBot('TOKEN')
+
+
+class SimpleMiddleware(BaseMiddleware):
+    def __init__(self, limit) -> None:
+        self.last_time = {}
+        self.limit = limit
+        self.update_types = ['message']
+        # Always specify update types, otherwise middlewares won't work
+
+
+    async def pre_process(self, message, data):
+        if not message.from_user.id in self.last_time:
+            # User is not in a dict, so lets add and cancel this function
+            self.last_time[message.from_user.id] = message.date
+            return
+        if message.date - self.last_time[message.from_user.id] < self.limit:
+            # User is flooding
+            await bot.send_message(message.chat.id, 'You are making request too often')
+            return CancelUpdate()
+        self.last_time[message.from_user.id] = message.date
+
+        
+    async def post_process(self, message, data, exception):
+        pass
+
+bot.setup_middleware(SimpleMiddleware(2))
+
+@bot.message_handler(commands=['start'])
+async def start(message):
+    await bot.send_message(message.chat.id, 'Hello!')
+
+bot.polling()