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Production Bot Tutorial

In this tutorial we'll implement slack-mathbot.

Introduction

A typical production Slack bot is a combination of a vanilla web server and a websocket application that talks to the Slack Real Time Messaging API. The web server is optional, but most people will run their Slack bots on Heroku in which case a web server is required to prevent Heroku from shutting the bot down. It also makes it convenient to develop a bot and test using foreman.

Getting Started

Gemfile

Create a Gemfile that uses slack-ruby-bot, sinatra (a web framework) and puma (a web server). For development we'll also use foreman and write tests with rspec.

source 'https://rubygems.org'

gem 'slack-ruby-bot'
gem 'puma'
gem 'sinatra'
gem 'dotenv'
gem 'celluloid-io'

group :development, :test do
  gem 'rake'
  gem 'foreman'
end

group :test do
  gem 'rspec'
  gem 'rack-test'
  gem 'vcr'
  gem 'webmock'
end

Run bundle install to get all the gems.

Application

Create a folder called slack-mathbot and inside of it create bot.rb.

module SlackMathbot
  class Bot < SlackRubyBot::Bot
  end
end

Commands

Create a folder called slack-mathbot/commands and inside of it create calculate.rb. For now this calculator will always return 4.

module SlackMathbot
  module Commands
    class Calculate < SlackRubyBot::Commands::Base
      command 'calculate' do |client, data, _match|
        client.say(channel: data.channel, text: '4')
      end
    end
  end
end

Require Everything

Create a slack-mathbot.rb at the root and require the above files.

require 'slack-ruby-bot'
require 'slack-mathbot/commands/calculate'
require 'slack-mathbot/bot'

Web Server

We will need to keep the bot alive on Heroku, so create web.rb.

require 'sinatra/base'

module SlackMathbot
  class Web < Sinatra::Base
    get '/' do
      'Math is good for you.'
    end
  end
end

Config.ru

Tie all the pieces together in config.ru which creates a thread for the bot and runs the web server on the main thread.

$LOAD_PATH.unshift(File.dirname(__FILE__))

require 'dotenv'
Dotenv.load

require 'slack-mathbot'
require 'web'

Thread.abort_on_exception = true

Thread.new do
  begin
    SlackMathbot::Bot.run
  rescue Exception => e
    STDERR.puts "ERROR: #{e}"
    STDERR.puts e.backtrace
    raise e
  end
end

run SlackMathbot::Web

Create a Bot User

In Slack administration create a new Bot Integration under services/new/bot.

On the next screen, note the API token.

.env

Create a .env file with the API token from above and make sure to add it to .gitignore.

SLACK_API_TOKEN=...

Procfile

Create a Procfile which foreman will use when you run the foreman start command below.

web: bundle exec puma -p $PORT

Run the Bot

Run foreman start. Your bot should be running.

14:32:32 web.1  | Puma starting in single mode...
14:32:32 web.1  | * Version 2.11.3 (ruby 2.1.6-p336), codename: Intrepid Squirrel
14:32:32 web.1  | * Min threads: 0, max threads: 16
14:32:32 web.1  | * Environment: development
14:32:35 web.1  | * Listening on tcp://0.0.0.0:5000
14:32:35 web.1  | Use Ctrl-C to stop
14:32:36 web.1  | I, [2015-07-10T14:32:36.216663 #98948]  INFO -- : Welcome 'mathbot' to the 'xyz' team at https://xyz.slack.com/.
14:32:36 web.1  | I, [2015-07-10T14:32:36.766955 #98948]  INFO -- : Successfully connected to https://xyz.slack.com/.

Try

Invite the bot to a channel via /invite [bot name] and send it a calculate command with [bot name] calculate 2+2. It will respond with 4 from the code above.

Write Tests

Spec Helper

Create spec/spec_helper.rb that includes the bot files and shared RSpec support from slack-ruby-bot.

$LOAD_PATH.unshift(File.join(File.dirname(__FILE__), '..'))

require 'slack-ruby-bot/rspec'
require 'slack-mathbot'

Test the Bot Application

Create a test for the bot application itself in spec/slack-mathbot/bot_spec.rb.

require 'spec_helper'

describe SlackMathbot::Bot do
  def app
    SlackMathbot::Bot.instance
  end

  subject { app }

  it_behaves_like 'a slack ruby bot'
end

Test a Command

Create a test for the calculate command in spec/slack-mathbot/commands/calculate_spec.rb. The bot is addressed by its user name.

require 'spec_helper'

describe SlackMathbot::Commands::Calculate do
  def app
    SlackMathbot::Bot.instance
  end

  subject { app }

  it 'returns 4' do
    expect(message: "#{SlackRubyBot.config.user} calculate 2+2", channel: 'channel').to respond_with_slack_message('4')
  end
end

See lib/slack-ruby-bot/rspec/support/slack-ruby-bot for other shared RSpec behaviors.

Deploy

See DEPLOYMENT for how to deploy your bot to production.