hi.rb

require 'slack-ruby-client'
require 'async'

raise 'Missing ENV[SLACK_API_TOKENS]!' unless ENV.key?('SLACK_API_TOKENS')

$stdout.sync = true
logger = Logger.new($stdout)
logger.level = Logger::DEBUG

threads = []

ENV['SLACK_API_TOKENS'].split.each do |token|
  logger.info "Starting #{token[0..12]} ..."

  client = Slack::RealTime::Client.new(token: token)

  client.on :hello do
    logger.info "Successfully connected, welcome '#{client.self.name}' to the '#{client.team.name}' team at https://#{client.team.domain}.slack.com."
  end

  client.on :message do |data|
    logger.info data

    client.typing channel: data.channel

    case data.text
    when /hi/ then
      client.message channel: data.channel, text: "Hi <@#{data.user}>!"
    else
      client.message channel: data.channel, text: "Sorry <@#{data.user}>, what?"
    end
  end

  threads << client.start_async
end

threads.each(&:join)