Module: Zeus

Defined in:
lib/zeus.rb,
lib/zeus/m.rb,
lib/zeus/plan.rb,
lib/zeus/rails.rb,
lib/zeus/version.rb,
lib/zeus/load_tracking.rb,
lib/zeus/m/test_method.rb,
lib/zeus/m/test_collection.rb

Defined Under Namespace

Modules: M Classes: LoadTracking, Plan, Rails

Constant Summary collapse

VERSION = 
"0.13.3"

Class Attribute Summary collapse

Class Method Summary collapse

Class Attribute Details

.dummy_tty ⇒ Object

Returns the value of attribute dummy_tty.



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# File 'lib/zeus.rb', line 12

def dummy_tty
  @dummy_tty
end

.master_socket ⇒ Object

Returns the value of attribute master_socket.



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# File 'lib/zeus.rb', line 12

def master_socket
  @master_socket
end

.plan ⇒ Object

Returns the value of attribute plan.



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# File 'lib/zeus.rb', line 12

def plan
  @plan
end

Class Method Details

.go(identifier = :boot) ⇒ Object 



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# File 'lib/zeus.rb', line 37

def go(identifier=:boot)
  $0 = "zeus slave: #{identifier}"

  setup_dummy_tty!
  master = setup_master_socket!
  feature_pipe_r, feature_pipe_w = IO.pipe

  # I need to give the master a way to talk to me exclusively
  local, remote = UNIXSocket.pair(Socket::SOCK_STREAM)
  master.send_io(remote)

  # Now I need to tell the master about my PID and ID
  local.write "P:#{Process.pid}:#{identifier}\0"
  local.send_io(feature_pipe_r)

  # Now we run the action and report its success/fail status to the master.
  features = Zeus::LoadTracking.features_loaded_by {
    run_action(local, identifier)
  }

  # the master wants to know about the files that running the action caused us to load.
  Thread.new { notify_features(feature_pipe_w, features) }

  # We are now 'connected'. From this point, we may receive requests to fork.
  children = Set.new
  loop do
    messages = local.recv(2**16)

    # Reap any child runners or slaves that might have exited in
    # the meantime. Note that reaping them like this can leave <=1
    # zombie process per slave around while the slave waits for a
    # new command.
    children.each do |pid|
      children.delete(pid) if Process.waitpid(pid, Process::WNOHANG)
    end

    messages.split("\0").each do |new_identifier|
      new_identifier =~ /^(.):(.*)/
      code, ident = $1, $2
      pid = nil
      if code == "S"
        children << fork { go(ident.to_sym) }
      else
        children << fork { command(ident.to_sym, local) }
      end
    end
  end
end

.setup_dummy_tty! ⇒ Object

this is totally asinine, but readline gets super confused when it’s required at a time when stdin or stdout is not connected to a TTY, no matter what we do to tell it otherwise later. So we create a dummy TTY in case readline is required.

Yup.



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# File 'lib/zeus.rb', line 20

def setup_dummy_tty!
  return if self.dummy_tty
  master, self.dummy_tty = PTY.open
  Thread.new {
    loop { master.read(1024) }
  }
  STDIN.reopen(dummy_tty)
  STDOUT.reopen(dummy_tty)
end

.setup_master_socket! ⇒ Object 



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# File 'lib/zeus.rb', line 30

def setup_master_socket!
  return master_socket if master_socket

  fd = ENV['ZEUS_MASTER_FD'].to_i
  self.master_socket = UNIXSocket.for_fd(fd)
end