Capistrano replacement via common rake tasks

_

you will need
* hash_wia gem https://github.com/dux/hash_wia
* https://github.com/amazing-print/amazing_print

# to fully deploy application
rake remote:deploy 

remote.rake

load 'lib/remote_host.rb'

###

RemoteHost.add :app, 'user@206.181.31.166:/home/user/app', log: 'log/production.log'
RemoteHost.add :db, 'user@46.201.171.185', config: '/etc/postgresql/12/main/pg_hba.conf', log: '/var/log/postgresql/postgresql-12-main.log.1'

###

# create remote tasks, pass server argument if you want to toogle server
def rtask *args, &block
  name = args.shift
  desc args.shift if args.first.is_a?(String)
  task name, args do |_, argumnets|
    RemoteHost.new argumnets, &block
    puts ''
  end
end

def app_test
  run 'bundle exec lux e :ok'
end

###

task :remote do
  puts 'Servers'
  ap RemoteHost::HOSTS
end

namespace :remote do
  rtask :bash, 'bash shell in app root', :server do
    run 'bash -i'
  end

  rtask :console, 'App console (rails or postgre)', :server do
    run 'bundle exec lux c' if host? :app
    run 'psql "%s"' % postgres_url if host? :db
  end

  rtask :caddy, 'Edit caddy config' do
    run 'sudo vim /etc/caddy/Caddyfile'
    run 'sudo systemctl restart web-caddy && sleep 1 && systemctl status web-caddy'
  end

  rtask :restart, 'restart remote app server', :server, :hard do
    host? :app do
      if @args.hard
        run 'sudo systemctl restart web-puma && sleep 1 && systemctl status web-puma'
      else
        run 'touch tmp/restart.txt'
      end
   end

   run 'service postgresql restart' if host? :db
  end

  rtask :config, 'edit main config file', :server do
    run 'vim .etc' if host? :app
    run "vim #{host.config}; service postgresql restart" if host? :db
  end

  rtask :htop, 'HTOP on server', :server do
    run 'htop'
  end

  rtask :deploy_app do
    rsync '.', ''
    upload './config/misc/env_web', './.env'
  end

  rtask :assets, 'Build and deploy assets' do
    invoke 'assets:compile'
    rsync './public/assets', '/public'
  end

  rtask :fdeploy, 'Only deploy ruby code' do
    invoke 'remote:deploy_app'
    invoke 'remote:restart'
    app_test
  end

  rtask :deploy, 'Deploy app' do
    invoke 'assets:compile'
    invoke 'remote:deploy_app'

    run 'bundle install'
    run 'bundle exec rake db:am'

    invoke 'remote:restart'
    app_test
  end

  rtask :log, 'Log via lnav', :server do
    run 'lnav %s' % host.log
  end
end

remote_host.rb

# uset to run task in remote servers
# configure in Lux.secrets.remote_servers
# rake remote:bash[server_name]

class RemoteHost
  HOSTS ||= {}

  class << self
    def add name, server, opts={}
      opts = opts.to_hwia
      opts[:user], opts[:ip], opts[:path] = server.split(/[\@:]/)
      opts[:path] ||= '~'
      opts[:name] = name
      HOSTS[name] = opts
    end
  end

  ###

  attr_reader :host

  def initialize opts, &block
    server = opts[:server].to_s == '' ? HOSTS.keys.first : opts[:server].to_sym
    @host = HOSTS[server]
    @args = opts
    instance_exec &block
  end

  # return true or execute block if we are on a right host
  def host? name
    return false unless host.name == name
    yield if block_given?
    true
  end

  def die text
    puts text.red
    exit
  end

  def local command
    puts command.magenta
    system command
  end

  def invoke name
    local 'rake %s' % name
  end

  # run on remote server
  def run command, opts={}
    command = command.join('; ') if command.is_a?(Array)
    command = command.sub(/^bundle\s/, '/home/deployer/.rbenv/shims/bundle ')
    command = command.gsub("'", "\\'")
    full    =  "ssh -t #{@host.user}@#{@host.ip} 'cd #{@host.path}; #{command}';"
    puts full.magenta
    system full
    die 'Error in last command, exiting' unless $?.success?
  end

  # rsync '/foo/bar', '/foo/bar'
  # rsync '/foo/bar', 'foo/'
  def rsync source, dest, opts={}
    die 'rsync source cant end with "/" - %s' % source if source.end_with?('/')
    sync = ['rsync -vrph --executability --delete']
    sync.push %w{.env .git/* .gems/* log/* tmp/* public/assets/* node_modules/* cache/*}.map { |it| "--exclude '%s'" % it }.join(' ')
    sync.push "#{source} #{@host.user}@#{@host.ip}:#{@host.path}#{dest}"
    local sync.join(' ')
  end

  # copy file
  def upload source, dest=nil
    dest ||= source
    dest = dest.sub(/^\.\//, '%s/' % @host.path)
    local "scp #{source} #{@host.user}@#{@host.ip}:#{dest}"
  end

  def download source, dest=nil
    dest ||= source
    source = source.sub(/^\.\//, '%s/' % @host.path)
    local "scp #{source} #{@host.user}@#{@host.ip}:#{dest}"
  end
end