Class: Shrimple::Phantom

Inherits:
Process show all
Defined in:
lib/shrimple/phantom.rb

Instance Attribute Summary collapse

Attributes inherited from Process

#start_time, #stop_time

Instance Method Summary collapse

Methods inherited from Process

#_child_thread, #_deactivate, #finished?, #kill, #killed?, #stop, #success?, #timed_out?

Constructor Details

#initialize(options) ⇒ Phantom

Returns a new instance of Phantom.



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# File 'lib/shrimple/phantom.rb', line 13

def initialize options
  @options = options

  # write the file required by phantom's --config option
  if options[:config]
    @config = Tempfile.new(File.basename(options[:output] || 'shrimple') + '.config')
    @config.write(options[:config].to_json)
    @config.close
  end

  # create the ios to supply input and read output
  @stdin  = new_io(options[:stdin] || StringIO.new(options.to_json))
  @stdout = new_io(options[:output], 'wb')
  @stderr = new_io(options[:stderr], 'wt')

  if options[:debug]
    # hm, should this be replaced with methods?  or maybe a superclass?
    $stderr.puts "COMMAND: #{command_line}"
    $stderr.puts "STDIN: #{options.to_json}"
  end

  super(command_line, @stdin, @stdout, @stderr, options[:timeout])
end

Instance Attribute Details

#config ⇒ Object (readonly)

Returns the value of attribute config.



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# File 'lib/shrimple/phantom.rb', line 11

def config
  @config
end

#options ⇒ Object (readonly)

Returns the value of attribute options.



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# File 'lib/shrimple/phantom.rb', line 11

def options
  @options
end

Instance Method Details

#_cleanup ⇒ Object

cleans up after the process. synchronized so it’s guaranteed to only be called once. process is removed from the process table after this call returns



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# File 'lib/shrimple/phantom.rb', line 57

def _cleanup
  super

  proc = (success? ? @options[:onSuccess] : @options[:onError])
  proc.call(self) if proc

  @config.unlink if @config
end

#stderr ⇒ Object 



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# File 'lib/shrimple/phantom.rb', line 50

def stderr
  read_io @stderr
end

#stdout ⇒ Object 



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# File 'lib/shrimple/phantom.rb', line 46

def stdout
  read_io @stdout
end

#wait ⇒ Object

blocks until the PhantomJS process is finished. raises an exception if it failed.



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# File 'lib/shrimple/phantom.rb', line 38

def wait
  stop
  unless @child.value.success?
    raise Shrimple::TimedOut.new if timed_out?
    raise Shrimple::PhantomError.new("PhantomJS returned #{@child.value.exitstatus}: #{stderr}")
  end
end