Python-telegram-bot: AWS Lambda

[revolter]

How can I use this inside an AWS Lambda function?

As far as I can tell, it works as a server, but I need it to run only once.

[jh0ker]

You might be able to use telegram.Bot (and related classes like ReplyKeyboardMarkup etc) to make API requests, but you can probably not use the framework in telegram.ext.

[revolter]

What is telegram.ext?

[jh0ker]

It's a multi-threaded bot framework that is part of our library, in addition to the "basic" API implementation.

[jh0ker]

Since AWS Lambda is stateless, you can only use it in a limited fashion, if at all.

If you want to try it, I'd go on about it like this:

• Directly create a telegram.ext.Dispatcher instance on every request, ignore telegram.ext.Updater completely
• Register your handlers like normal
• Set a webhook to your Lambda function with bot.setWebhook() (do this only once, from your PC)
• Use telegram.Update.de_json(json.loads(request_body.decode())) to decode every update
• Use the process_update method of your Dispatcher object to process the decoded update

[revolter]

Thanks a bunch for the detailed instructions! I'll close this for now until (if) I have more questions.

[dev2060]

@jh0ker Hi. I am just curious about possibility to integrate Lambda with your telegram python bot. Do you have any news since this?

[jh0ker]

@dev2060 It should be pretty much the same process

[erpheus]

For anyone wandering around here again here is an excerpt from my lambda function's code:

import json
import os
from telegram.ext import Dispatcher
from telegram import Update, Bot
from bot.handlers import set_up


bot = Bot(token=os.getenv('TELEGRAM_TOKEN'))
dispatcher = Dispatcher(bot, None, use_context=True)
set_up(dispatcher)


def lambda_handler(event, context):
    try:
        dispatcher.process_update(
            Update.de_json(json.loads(event["body"]), bot)
        )

    except Exception as e:
        print(e)
        return {"statusCode": 500}

    return {"statusCode": 200}

The set_up function basically calls dispatcher.add_handler as usual with this library.

[dangtoanphat]

@ergoz thanks for your solutions 👍

[dfpoon]

I am new to this wonderful package. It may sound a nobody question, does 'bot.handlers.set_up' belong to the python-telegram-bot package? I cannot find it in the documentation.

from bot.handlers import set_up

If not, what extra package do I need to install?

[Bibo-Joshi]

The set_up function basically calls dispatcher.add_handler as usual with this library.

The OP propbably has a self-written module bot, which implements a specific telegram bot based on PTB, where bot.handlers is some sort of collection of Handlers and bot.handlers.set_up(disptacher) runs dispatcher.add_handler(handler) for all handler objects in bot.handlers

[dfpoon]

I'm a bit confused. That means the 'bot.handlers.set_up' is a custom
function which is not documented in the official doc, right?

If so, could any guru please rewrite those lines with the out-of-the-box
functions to make a clear template for AWS lambda use cases?

Deploying chat bots to the AWS lambda is cost effective and popular. Please
offer the help. Thx.

在 2020年3月11日週三 15:34，Bibo-Joshi [e-mail] 寫道：

The set_up function basically calls dispatcher.add_handler as usual with
this library.

The OP propbably has a self-written module bot, which implements a
specific telegram bot based on PTB, where bot.handlers is some sort of
collection of Handlers and bot.handlers.set_up(disptacher) runs
dispatcher.add_handler(handler) for all handler objects in bot.handlers

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[Bibo-Joshi]

I'm a bit confused. That means the 'bot.handlers.set_up' is a custom function which is not documented in the official doc, right?

yes

If so, could any guru please rewrite those lines with the out-of-the-box functions to make a clear template for AWS lambda use cases?

handlers = [handler1, handler2, …] # Or some other iterable

...

# "set_up(disptacher) runs dispatcher.add_handler(handler) for all
#  handler objects in bot.handlers" magically becomes:
def setup_handler(dispatcher):
    for handler in handlers:
        dispatcher.add_handler(handler)

This is not only for a AWS lambda use case btw but a rather common approach ;)