Class: Dokuen::Application

Inherits:
Object
  • Object
show all
Defined in:
lib/dokuen/application.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(name, config) ⇒ Application

Returns a new instance of Application.



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# File 'lib/dokuen/application.rb', line 9

def initialize(name, config)
  @name = name
  @config = config
end

Instance Attribute Details

#config ⇒ Object (readonly)

Returns the value of attribute config.



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# File 'lib/dokuen/application.rb', line 7

def config
  @config
end

#name ⇒ Object (readonly)

Returns the value of attribute name.



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# File 'lib/dokuen/application.rb', line 7

def name
  @name
end

Instance Method Details

#clean ⇒ Object 



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# File 'lib/dokuen/application.rb', line 224

def clean
  with_current_release do
    Dir.glob(".dokuen/*.pid") do |f|
      File.delete(f)
    end
  end
end

#create ⇒ Object 



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# File 'lib/dokuen/application.rb', line 56

def create
  Dir.chdir(File.join(config.dokuen_dir, 'apps')) do
    if File.exists?(name)
      raise "Application #{name} exists!"
    end

    FileUtils.mkdir_p(name)
    with_app_dir do
      dirs = [
        'releases',
        'env',
        'logs',
        'build'
      ]
      FileUtils.mkdir_p(dirs)
    end
  end
end

#delete_env(var) ⇒ Object 



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# File 'lib/dokuen/application.rb', line 34

def delete_env(var)
  with_app_dir do
    File.delete(File.join("env", var)) rescue nil
  end
end

#deploy(revision) ⇒ Object 



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# File 'lib/dokuen/application.rb', line 75

def deploy(revision)
  git_dir = Dir.getwd

  with_app_dir do
    now = Time.now().utc().strftime("%Y%m%dT%H%M%S")
    release_dir = "releases/#{now}"
    clone_dir = clone(git_dir, revision)

    buildpack = get_env('BUILDPACK_URL')
    if buildpack
      buildpack = "-b #{buildpack}"
    else
      buildpack = ''
    end

    sys("mason build #{clone_dir} #{buildpack} -o #{release_dir} -c build")
    Dir.mkdir("#{release_dir}/.dokuen")

    hook = get_env('DOKUEN_AFTER_BUILD')
    if hook
      sys("foreman run #{hook}")
    end

    if File.symlink?("previous")
      File.unlink("previous")
      File.symlink(File.readlink("current"), "previous")
    end

    if File.symlink?("current")
      File.unlink("current")
    end

    File.symlink(File.expand_path(release_dir), "current")
  end

  scale
  if File.symlink?("previous")
    shutdown(File.readlink("previous"))
  end
end

#env ⇒ Object 



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# File 'lib/dokuen/application.rb', line 40

def env
  vars = read_env_dir("#{config.dokuen_dir}/env")
  with_app_dir do
    vars.merge!(read_env_dir('env'))
    with_current_release do
      File.open(".env") do |f|
        f.lines.each do |line|
          key, val = line.split('=', 2)
          vars[key] = val.chomp
        end
      end
    end
  end
  vars
end

#get_env(var) ⇒ Object 



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# File 'lib/dokuen/application.rb', line 14

def get_env(var)
  with_app_dir do
    env_path = File.join("env", var)
    if File.exists?(env_path)
      return File.read(env_path)
    else
      return nil
    end
  end
end

#install_nginx_config ⇒ Object 



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# File 'lib/dokuen/application.rb', line 204

def install_nginx_config
  puts "Installing nginx config"
  sleep 2
  conf = Dokuen.template('nginx', binding)
  File.open(File.join(config.dokuen_dir, "nginx", "#{name}.#{config.base_domain_name}.conf"), "w+") do |f|
    f.write(conf)
  end

  sys("sudo #{config.bin_path}/dokuen_restart_nginx")
end

#restart ⇒ Object 



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# File 'lib/dokuen/application.rb', line 194

def restart
  with_current_release do
    running_processes.each do |proc, pidfile|
      pid = YAML.load(File.read(pidfile))['pid']
      puts "Sending USR2 to pid #{pid}"
      Process.kill("USR2", pid)
    end
  end
end

#run_command(args) ⇒ Object 



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# File 'lib/dokuen/application.rb', line 215

def run_command(args)
  with_current_release do
    env.each do |k,v|
      ENV[k] = v
    end
    sys("#{config.bin_path}/foreman run #{args.join(" ")}")
  end
end

#scale ⇒ Object 



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# File 'lib/dokuen/application.rb', line 116

def scale
  puts "Scaling..."
  with_current_release do
    processes = running_processes
    running_count_by_name = {}

    processes.each do |proc, pidfile|
      proc_name = proc.split('.')[0]
      running_count_by_name[proc_name] ||= 0
      running_count_by_name[proc_name] += 1
    end

    desired_count_by_name = {}
    scale_spec = get_env('DOKUEN_SCALE')
    if scale_spec
      scale_spec.split(',').each do |spec|
        proc_name, count = spec.split('=')
        desired_count_by_name[proc_name] = count.to_i
      end
    end

    to_start = []
    to_stop = []

    desired_count_by_name.each do |proc_name, count|
      running = running_count_by_name[proc_name] || 0
      if running < count
        (count - running).times do |i|
          index = running + i + 1
          to_start << [proc_name, index]
        end
      elsif running > count
        (running - count).times do |i|
          index = count + i + 1
          to_stop << [proc_name, index]
        end
      end
    end

    running_count_by_name.each do |proc_name, count|
      if not desired_count_by_name.has_key?(proc_name)
        count.times do |i|
          to_stop << [proc_name, i]
        end
      end
    end

    to_start.each do |proc_name, index|
      port = reserve_port
      fork do
        Dokuen::Wrapper.new(self, proc_name, index, File.join(config.dokuen_dir, 'ports', port.to_s)).run!
      end
    end

    to_stop.each do |proc_name, index|
      pid_file = processes["#{proc_name}.#{index}"]
      pid = YAML.load(File.read(pid_file))['pid']
      Process.kill("TERM", pid)
    end
    install_nginx_config
  end
end

#set_env(var, val) ⇒ Object 



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# File 'lib/dokuen/application.rb', line 25

def set_env(var, val)
  with_app_dir do
    env_path = File.join("env", var)
    File.open(env_path, "w+") do |f|
      f.write(val)
    end
  end
end

#shutdown(release = nil) ⇒ Object 



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# File 'lib/dokuen/application.rb', line 179

def shutdown(release=nil)
  if release.nil?
    with_app_dir do
      release = File.readlink("current")
    end
  end

  with_release_dir(release) do
    running_processes.each do |proc, pidfile|
      pid = YAML.load(File.read(pidfile))['pid']
      Process.kill("TERM", pid)
    end
  end
end