TMI (Twitch Messaging Interface) for Elixir

Connect to Twitch chat with Elixir.

Installation

The package can be installed by adding tmi to your list of dependencies in mix.exs:

def deps do
  [
    {:tmi, "~> 0.7.0"},
  ]
end

Documentation can be found at https://hexdocs.pm/tmi/readme.html.

Usage

You can use your own Twitch username, but it is recommended to make a new twitch account just for your bot. You'll also need an OAuth token for the password.

The simplest method to get an OAuth token (while logged in to the account your bot will use), use the Twitch Chat OAuth Password Generator.

Create a bot module to deal with chat messages or events:

defmodule MyBot do
  use TMI

  @impl TMI.Handler
  def handle_message("!" <> command, sender, chat) do
    case command do
      "dice" ->
        say(chat, Enum.random(~w(⚀ ⚁ ⚂ ⚃ ⚄ ⚅)))

      "echo " <> rest ->
        say(chat, rest)

      "dance" ->
        me(chat, "dances for #{sender}")

      _ ->
        say(chat, "unrecognized command")
    end
  end

  def handle_message(message, sender, chat) do
    Logger.debug("Message in #{chat} from #{sender}: #{message}")
  end
end

Available handler callbacks:

handle_connected(server, port)
handle_logged_in()
handle_login_failed(reason)
handle_disconnected()
handle_join(chat)
handle_join(chat, user)
handle_part(chat)
handle_part(chat, user)
handle_kick(chat, kicker)
handle_kick(chat, user, kicker)
handle_whisper(message, sender)
handle_whisper(message, sender, tags)
handle_message(message, sender, chat)
handle_message(message, sender, chat, tags)
handle_mention(message, sender, chat)
handle_action(message, sender, chat)
handle_unrecognized(msg)
handle_unrecognized(msg, tags)

Starting

First we need to go over the config options.

Config options

• :bot - The module that uses TMI and implements the TMI.Handler behaviour.
• :user - Twitch username of your bot user (lowercase).
• :pass - OAuth token to use as a password, prefixed with oauth:.
• :channels - The list of channels to join (lowercase).
• :mod_channels - The list of channels where your bot is a moderator (this effects the message and command rate limits).

Example config

config :my_app,
  bots: [
    [
      bot: MyApp.Bot,
      user: "myappbot",
      pass: "oauth:myappbotpassword",
      channels: ["mychannel", "foo"],
      mod_channels: ["mychannel"],
      debug: false
    ]
  ]

Add to your supervision tree

Single bot example:

[bot_config] = Application.fetch_env!(:my_app, :bots)

children = [
  # If you have existing children, e.g.:
  Existing.Worker,
  {Another.Existing.Supervisor, []},
  # Add the bot.
  {TMI.Supervisor, bot_config}
]

Supervisor.start_link(children, strategy: :one_for_one, name: MyApp.Supervisor)

Multiple bots example:

bots = Application.fetch_env!(:my_app, :bots)
bot_children = for bot_config <- bots, do: {TMI.Supervisor, bot_config}

children = [
  # If you have existing children, e.g.:
  Existing.Worker,
  {Another.Existing.Supervisor, []}
  # Add the bot children.
  | bot_children
]

Supervisor.start_link(children, strategy: :one_for_one, name: MyApp.Supervisor)

To get your bot verified:

Visit https://dev.twitch.tv/limit-increase/ and have a good reason prepared.

Copyright and License

Copyright 2020 Ryan Winchester

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.