Notification tasks for Slack with Capistrano.

deploy.rb

namespace :notify do
  namespace :update do
    task :start do
      _send_message("[\`#{fetch(:application)}\`] Deployment has started.")
    end

    task :finish do
      _send_message("[\`#{fetch(:application)}\`] Deployment has finished. :ok_woman:\n> #{fetch(:commit_message)}")
    end
  end

  namespace :rollback do
    task :start do
      _send_message("[\`#{fetch(:application)}\`] Rollback has started.\nCurrent Revision is \`#{fetch(:latest_revision)}\`")
    end

    task :finish do
      _send_message("[\`#{fetch(:application)}\`] Rollback has finished. :ok_woman:\nCurrent revision is \`#{fetch(:current_revision)}\`")
    end
  end
end

before 'deploy:starting', 'notify:update:start'
after 'deploy:finishing', 'notify:update:finish'
before 'deploy:reverting', 'notify:rollback:start'
after 'deploy:finishing_rollback', 'notify:rollback:finish'

namespace :git do
  task :get_commit_message do
    repository_path = "#{fetch(:deploy_to)}/repo"
    on roles(:app) do
      within repository_path do
        commit_message = capture :git, 'log', '-1', '--pretty=format:"%h - %an : %s" HEAD'
        set :commit_message, commit_message.force_encoding("UTF-8")
      end
    end
  end
end

before 'notify:update:finish', 'git:get_commit_message'

require 'uri'
require 'net/http'
require 'json'

def _send_message(message)
  payload = {
    :text => message,
    :channel => '<CHANGE_THIS>',
    :username => 'Deploy Agent',
    :icon_emoji => ':shipit:',
  }
  teamname = '<CHANGE_THIS>'
  token = '<CHANGE_THIS>'

  uri = URI.parse("https://#{teamname}.slack.com/services/hooks/incoming-webhook?token=#{token}")

  response = nil

  request = Net::HTTP::Post.new(uri.request_uri)
  request.set_form_data({ :payload => JSON.generate( payload ) })

  http = Net::HTTP.new(uri.host, uri.port)
  http.use_ssl = true
  http.verify_mode = OpenSSL::SSL::VERIFY_NONE

  http.start do |h|
    response = h.request(request)
  end

  return response
end