Slack deploy notification task (adapted from capistrano-slack)

slack.cap

require 'json'

namespace :slack do
  def post_to_slack(payload)
    slack_subdomain = fetch(:slack_subdomain)
    slack_token     = fetch(:slack_token)

    uri = URI.parse("https://#{slack_subdomain}.slack.com/services/hooks/incoming-webhook?token=#{slack_token}")
    http = Net::HTTP.new(uri.host, uri.port)
    http.use_ssl = true
    http.verify_mode = OpenSSL::SSL::VERIFY_NONE

    request = Net::HTTP::Post.new(uri.request_uri)
    request.set_form_data(payload: payload.merge(default_payload).to_json)

    http.request(request)
  end

  def default_payload
    { channel: fetch(:slack_room), username: 'deploybot', icon_emoji: ':ghost:' }
  end
  
  desc 'Begin deploy notifications to Slack'
  task :starting do
    announced_deployer = fetch(:deployer)
    announced_stage    = fetch(:stage)
    application        = fetch(:slack_application)

    post_to_slack(text: "#{announced_deployer} is deploying #{application} to #{announced_stage}")

    set(:start_time, Time.now)
  end

  task :finished do
    announced_deployer = fetch(:deployer)
    application        = fetch(:slack_application)
    elapsed_time       = Time.now.to_i - fetch(:start_time).to_i

    post_to_slack(text: "#{announced_deployer} deployed #{application} successfully in #{elapsed_time} seconds.")
  end

  before 'deploy', 'slack:starting'
  after  'deploy', 'slack:finished'
end

Can we include the short git sha in the deploy notice?

Maybe even a link to the commit on GitHub?

Really awesome to see a custom slack integration at work!

The SHA should be pretty easy, as we can just grab it with git. We could probably hack together a github link from the SHA if desired.

Nice. Thinking of adapting this integration for the dscovr deploy process as well. Looks pretty straight-forward!