Class: Spring::Application

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

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(manager, watcher = Spring.watcher) ⇒ Application

Returns a new instance of Application.



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# File 'lib/spring/application.rb', line 10

def initialize(manager, watcher = Spring.watcher)
  @manager = manager
  @watcher = watcher
  @setup   = Set.new

  # Workaround for GC bug in Ruby 2 which causes segfaults if watcher.to_io
  # instances get dereffed.
  @fds = [manager, watcher.to_io]
end

Instance Attribute Details

#manager ⇒ Object (readonly)

Returns the value of attribute manager.



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# File 'lib/spring/application.rb', line 8

def manager
  @manager
end

#watcher ⇒ Object (readonly)

Returns the value of attribute watcher.



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# File 'lib/spring/application.rb', line 8

def watcher
  @watcher
end

Instance Method Details

#invoke_after_fork_callbacks ⇒ Object 



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# File 'lib/spring/application.rb', line 125

def invoke_after_fork_callbacks
  Spring.after_fork_callbacks.each do |callback|
    callback.call
  end
end

#loaded_application_features ⇒ Object 



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# File 'lib/spring/application.rb', line 131

def loaded_application_features
  $LOADED_FEATURES.select { |f| f.start_with?(File.realpath(Rails.root)) }
end

#run ⇒ Object 



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# File 'lib/spring/application.rb', line 46

def run
  watcher.start

  loop do
    IO.select(@fds)

    if watcher.stale?
      exit
    else
      serve manager.recv_io(UNIXSocket)
    end
  end
end

#serve(client) ⇒ Object 



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# File 'lib/spring/application.rb', line 60

def serve(client)
  manager.puts

  streams = 3.times.map { client.recv_io }
  args    = JSON.load(client.read(client.gets.to_i))
  command = Spring.command(args.shift)

  setup command

  ActionDispatch::Reloader.cleanup!
  ActionDispatch::Reloader.prepare!

  pid = fork {
    Process.setsid
    [STDOUT, STDERR, STDIN].zip(streams).each { |a, b| a.reopen(b) }
    IGNORE_SIGNALS.each { |sig| trap(sig, "DEFAULT") }

    ActiveRecord::Base.establish_connection if defined?(ActiveRecord::Base)
    ARGV.replace(args)
    srand

    invoke_after_fork_callbacks

    if command.respond_to?(:call)
      command.call
    else
      exec_name = command.exec_name
      gem_name  = command.gem_name if command.respond_to?(:gem_name)

      exec = Gem.bin_path(gem_name || exec_name, exec_name)
      $0 = exec
      load exec
    end
  }

  manager.puts pid

  # Wait in a separate thread so we can run multiple commands at once
  Thread.new {
    _, status = Process.wait2 pid
    streams.each(&:close)
    client.puts(status.exitstatus)
    client.close
  }

rescue => e
  streams.each(&:close) if streams
  client.puts(1)
  client.close
  raise
end

#setup(command) ⇒ Object

The command might need to require some files in the main process so that they are cached. For example a test command wants to load the helper file once and have it cached.



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# File 'lib/spring/application.rb', line 115

def setup(command)
  return if @setup.include?(command.class)
  @setup << command.class

  if command.respond_to?(:setup)
    command.setup
    watcher.add loaded_application_features # loaded features may have changed
  end
end

#start ⇒ Object 



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# File 'lib/spring/application.rb', line 20

def start
  require Spring.application_root_path.join("config", "application")

  # The test environment has config.cache_classes = true set by default.
  # However, we don't want this to prevent us from performing class reloading,
  # so this gets around that.
  ::Rails::Application.initializer :initialize_dependency_mechanism, group: :all do
    ActiveSupport::Dependencies.mechanism = :load
  end

  # This initializer has issues after we disconnect from the DB, but we don't need it.
  if defined?(ActiveRecord::Base)
    ActiveRecord::Railtie.initializers.delete_if { |i| i.name == "active_record.set_reloader_hooks" }
  end

  require Spring.application_root_path.join("config", "environment")

  ActiveRecord::Base.remove_connection if defined?(ActiveRecord::Base)

  watcher.add loaded_application_features
  watcher.add Spring.gemfile, "#{Spring.gemfile}.lock"
  watcher.add Rails.application.paths["config/initializers"]

  run
end