private_pub Capistrano 3 with Thin on Unix socket

deploy.rb

set :private_pub_pid, -> { "#{current_path}/tmp/pids/private_pub.pid" }
set :private_pub_socket, -> { "#{current_path}/tmp/sockets/private_pub.sock" }
set :private_pub_rackup, -> { "#{current_path}/private_pub.ru" }

namespace :private_pub do
  desc "Start private_pub server"
  task :start do
    on roles(:app) do
      within release_path do
        with rails_env: fetch(:stage) do
          execute :bundle, "exec thin -e production -d -P #{fetch(:private_pub_pid)} -S #{fetch(:private_pub_socket)} -R #{fetch(:private_pub_rackup)} start"
        end
      end
    end
  end

  desc "Stop private_pub server"
  task :stop do
    on roles(:app) do
      within release_path do
        execute "if [ -f #{fetch(:private_pub_pid)} ] && [ -e /proc/$(cat #{fetch(:private_pub_pid)}) ]; then kill -9 `cat #{fetch(:private_pub_pid)}`; fi"
      end
    end
  end

  desc "Restart private_pub server"
  task :restart do
    on roles(:app) do
      invoke 'private_pub:stop'
      invoke 'private_pub:start'
    end
  end
end

after 'deploy:restart', 'private_pub:restart'

nginx + websocket + thin : https://gist.github.com/sigra/8e8fa71cb43ffa8552a7