Class: OFlow::Actors::ShellOne

Inherits:
OFlow::Actor show all
Defined in:
lib/oflow/actors/shellone.rb

Instance Attribute Summary collapse

Attributes inherited from OFlow::Actor

#task

Instance Method Summary collapse

Methods inherited from OFlow::Actor

#busy?, #inputs, #options, #outputs, #set_option, #with_own_thread

Constructor Details

#initialize(task, options) ⇒ ShellOne

Returns a new instance of ShellOne.



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# File 'lib/oflow/actors/shellone.rb', line 14

def initialize(task, options)
  super
  @dir = options[:dir]
  @dir = '.' if @dir.nil?
  @dir = File.expand_path(@dir.strip)
  
  @cmd = options[:cmd]
  @timeout = options.fetch(:timeout, 1.0).to_f
  @timeout = 0.001 if 0.001 > @timeout
end

Instance Attribute Details

#cmd ⇒ Object (readonly)

Returns the value of attribute cmd.



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# File 'lib/oflow/actors/shellone.rb', line 11

def cmd
  @cmd
end

#dir ⇒ Object (readonly)

Returns the value of attribute dir.



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# File 'lib/oflow/actors/shellone.rb', line 10

def dir
  @dir
end

#timeout ⇒ Object (readonly)

Returns the value of attribute timeout.



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# File 'lib/oflow/actors/shellone.rb', line 12

def timeout
  @timeout
end

Instance Method Details

#perform(op, box) ⇒ Object 



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# File 'lib/oflow/actors/shellone.rb', line 25

def perform(op, box)
  input = Oj.dump(box.contents, mode: :compat, indent: 0)
  i, o, e, _ = Open3.popen3(@cmd, chdir: @dir)
  i.write(input)
  i.close
  giveup = Time.now + @timeout
  ra = [e, o]

  out = ''
  err = ''
  ec = false # stderr closed flag
  oc = false # stdout closed flag
  while true
    rem = giveup - Time.now
    raise Exception.new("Timed out waiting for output.") if 0.0 > rem
    rs, _, es = select(ra, nil, ra, rem)
    unless es.nil?
      es.each do |io|
        ec |= io == e
        oc |= io == o
      end
    end
    break if ec && oc
    unless rs.nil?
      rs.each do |io|
        if io == e && !ec
          if io.closed? || io.eof?
            ec = true
            next
          end
          err += io.read_nonblock(1000)
        elsif io == o && !oc
          if io.closed? || io.eof?
            oc = true
            next
          end
          out += io.read_nonblock(1000)
        end
      end
    end
    break if ec && oc
  end
  if 0 < err.length
    raise Exception.new(err)
  end
  output = Oj.load(out, mode: :compat)
  o.close
  e.close

  task.ship(nil, Box.new(output, box.tracker))
end