Some years ago I developed a little telegram bot called comptrain-individuals that parses WODs from Comptrain and post them on a telegram Channel called @CompTrainIndividuals. The problem was, in order to deploy it and have it online 24/7 I was using a free account on OpenRedshift, which forced me to recreate an account every 60 days and re-deploy everything again.

Recently I came out across a solution using AWS Lambda and its free tier products and since then I have had no problems at all. I only needed to deploy it once and it has been working since then. Today I want to tell you how you can do the same for your telegram bots.

Set up a AWS account using AWS free tier

In order to do that, just go to https://aws.amazon.com/free/ and create an account. You are going to use an AWS Lambda to deploy the bot there.

Create and set up a lambda function

I will not go over the details on how to create a lambda function, since there are plenty of resources for that, as I am using serverless, you can read their documentation on AWS Lambda.

Serverless configuration

For my telegram bot, I am using a configuration that just execute the bot every day at 4AM:

service: comptrain-bot

provider:
name: aws
runtime: python3.7
region: eu-central-1

functions:
comptrain:
handler: handler.main
events:
- schedule: cron(0 4 * * ? *)


Deploy the code to AWS lambda

Last step, in order to deploy our function to AWS, you need to use either aws-vault or awscli and set it up to use your credentials. Once you have done this, you can upload your function code using this steps:

    #!/bin/bash

sls deploy
# if you are using python with poetry, this is the way of package dependencies
cd .venv/lib/python3.7/site-packages
zip -r9 ${OLDPWD}/function.zip . cd$OLDPWD
zip -g function.zip handler.py
aws lambda update-function-code --function-name comptrain-bot-dev-comptrain --zip-file fileb://function.zip
rm function.zip


In order to package a python virtual environment you need to follow the steps specified in Deploy Python Lambda functions with .zip file archives

And that's it! hope it helps.

Date: 2021-02-27 Sat 00:00

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