Module: Phantom

Defined in:
lib/phantom.rb,
lib/phantom/base.rb,
lib/phantom/phutex.rb,
lib/phantom/status.rb,
lib/phantom/version.rb,
lib/phantom/fork_error.rb,
lib/phantom/class_methods.rb

Defined Under Namespace

Modules: Status Classes: Base, ForkError, Phutex

Constant Summary collapse

VERSION = 
"0.0.3"

Class Method Summary collapse

Class Method Details

.run(pid_file: nil, on_ok: nil, on_error: nil, &block) ⇒ Object

Raises:



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# File 'lib/phantom/class_methods.rb', line 4

def run(pid_file: nil, on_ok: nil, on_error: nil, &block)
  return Phantom::Base.new(nil) unless block_given?

  raise ForkError.new('Running process exists.', pid_file) if pid_file and File.exist?(pid_file)

  i, o = IO.pipe
  f = File.new(pid_file, 'w') if pid_file

  pid = fork do
    at_exit do
      o.flush
      o.close
      File.delete pid_file if pid_file
    end
    
    i.close
    begin
      block.call if block_given?
      Marshal.dump(Status::OK, o)
    rescue StandardError => e
      Marshal.dump(e, o)
    end
  end

  Process.detach(pid)
  f.write(pid.to_s) if pid_file
  f.close if pid_file
  o.close

  Thread.abort_on_exception = true
  Thread.new do
    begin
      status = Marshal.load(i)
      if status == Status::OK then
        on_ok.call if on_ok
      else
        on_error.call(status) if on_error
      end
    rescue Errno::EPIPE, EOFError => e
      on_error.call(e) if on_error
    ensure
      i.close
    end
  end

  return Phantom::Base.new(pid)
end