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Kemal Middleware#

If you're not aware, kemal is a lightweight web application framework for Crystal similar to Ruby's Sinatra. It is extremely fast, and prefect for hosting a Telegram bot, especially if you wish to also integrate a web front end, API, etc.

The Kemal Adapter#

Using Tourmaline in your Kemal project is pretty simple:

require "kemal"
require "tourmaline/adapters/kemal"
require "./yourbot" # change this to your bot

# Add handler is a Kemal method for adding middleware
  # pass in a new instance of your bot
  # set the url
  url: "",
  # set the path to serve the webhook on
  path: "/bot-webhook/#{ENV["TGBOT_API_KEY"]}"