Capistrano deployment notification using Hall.

hall.cap

require 'hall'

namespace :hall_notify do
  task :environment do
    set :capistrano_thumb_url,
      'https://raw.github.com/smashingboxes/capistrano-haller/master/resources/capistrano-logo.png'
  end

  def send_hall_notification(action)
    hall_room_key = fetch(:hall_room_key)
    if hall_room_key.empty?
      logger.important("You must set hall_room_key for hall notifications to work!")
    else
      begin
        hall = Hall::Client.new(hall_room_key, 'Capistrano', fetch(:capistrano_thumb_url))
        message = message_by_action action
        hall.post_message message
      rescue
        logger.important("Could not contact hall API for deployment notification.")
      end
    end
  end

  def message_by_action(action)
    case action
    when :deploy_starting
      "Branch <strong>#{fetch(:branch)}</strong> is starting to deploy to <strong>#{fetch(:stage)}</strong> as #{fetch(:rails_env)}."
    when :deploy_finishing
      "Branch <strong>#{fetch(:branch)}</strong> was successfully deployed to <strong>#{fetch(:stage)}</strong> as #{fetch(:rails_env)}."
    when :deploy_finishing_rollback
      "Branch <strong>#{fetch(:branch)}</strong> was NOT deployed to <strong>#{fetch(:stage)}</strong> as #{fetch(:rails_env)}."
    end
  end

  desc "Notify a hall channel of deployment starting"
  task deploy_starting: :environment do
    on roles(:app) do
      send_hall_notification :deploy_starting
    end
  end
  desc "Notify a hall channel of deployment finishing"
  task deploy_finishing: :environment do
    on roles(:app) do
      send_hall_notification :deploy_finishing
    end
  end
  desc "Notify a hall channel of deployment rollback"
  task deploy_finishing_rollback: :environment do
    on roles(:app) do
      send_hall_notification :deploy_finishing_rollback
    end
  end
  desc 'Notify test'
  task test: :environment do
    on roles(:app) do
      send_hall_notification :deploy_starting
      send_hall_notification :deploy_finishing
      send_hall_notification :deploy_finishing_rollback
    end
  end
end

namespace :deploy do
  before :starting, 'hall_notify:deploy_starting'
  after :finishing, 'hall_notify:deploy_finishing'
  after :finishing_rollback, 'hall_notify:deploy_finishing_rollback'
end