Create basic_example.py

examples/middleware/class_based/basic_example.py

@@ -0,0 +1,32 @@
+from telebot import TeleBot
+from telebot.handler_backends import BaseMiddleware
+
+bot = TeleBot('TOKEN', use_class_middlewares=True) # set use_class_middlewares to True!
+# otherwise, class-based middlewares won't execute.
+
+# You can use this classes for cancelling update or skipping handler:
+# from telebot.handler_backends import CancelUpdate, SkipHandler
+
+class Middleware(BaseMiddleware):
+    def __init__(self):
+        self.update_types = ['message']
+    def pre_process(self, message, data):
+        data['foo'] = 'Hello' # just for example
+        # we edited the data. now, this data is passed to handler.
+        # return SkipHandler() -> this will skip handler
+        # return CancelUpdate() -> this will cancel update
+    def post_process(self, message, data, exception=None):
+        print(data['foo'])
+        if exception: # check for exception
+            print(exception)
+
+@bot.message_handler(commands=['start'])
+def start(message, data: dict): # you don't have to put data parameter in handler if you don't need it.
+    bot.send_message(message.chat.id, data['foo'])
+    data['foo'] = 'Processed' # we changed value of data.. this data is now passed to post_process.
+
+
+# Setup middleware
+bot.setup_middleware(Middleware())
+
+bot.infinity_polling()