gitlab-org--gitlab-foss/app/workers/emails_on_push_worker.rb

class EmailsOnPushWorker
  include Sidekiq::Worker

  def perform(project_id, recipients, push_data, send_from_committer_email = false, disable_diffs = false)
    project = Project.find(project_id)
    before_sha = push_data["before"]
    after_sha = push_data["after"]
    branch = push_data["ref"]
    author_id = push_data["user_id"]

    if Gitlab::Git.blank_ref?(before_sha) || Gitlab::Git.blank_ref?(after_sha)
      # skip if new branch was pushed or branch was removed
      return true
    end

    compare = Gitlab::Git::Compare.new(project.repository.raw_repository, before_sha, after_sha)

    return false if compare.same

    if compare.commits.empty?
      compare = Gitlab::Git::Compare.new(project.repository.raw_repository, after_sha, before_sha)

      reverse_compare = true

      return false if compare.commits.empty?
    end

    recipients.split(" ").each do |recipient|
      Notify.repository_push_email(
        project_id, 
        recipient, 
        author_id, 
        branch, 
        compare, 
        reverse_compare,
        send_from_committer_email,
        disable_diffs
      ).deliver
    end
  ensure
    compare = nil
    GC.start
  end
end