Class: TurbotRunner::ScriptRunner

Inherits:
Object
  • Object
show all
Defined in:
lib/turbot_runner/script_runner.rb

Instance Method Summary collapse

Constructor Details

#initialize(command, output_file, script_config, options = {}) ⇒ ScriptRunner

Returns a new instance of ScriptRunner.



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# File 'lib/turbot_runner/script_runner.rb', line 9

def initialize(command, output_file, script_config, options={})
  @command = command
  @output_file = output_file

  record_handler = options[:record_handler] || BaseHandler.new  # A BaseHandler does nothing
  @processor = Processor.new(self, script_config, record_handler)

  @timeout = options[:timeout] || 3600
end

Instance Method Details

#interrupt ⇒ Object 



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# File 'lib/turbot_runner/script_runner.rb', line 73

def interrupt
  @interrupted = true
end

#interrupt_and_mark_as_failed ⇒ Object 



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# File 'lib/turbot_runner/script_runner.rb', line 77

def interrupt_and_mark_as_failed
  @interrupted = true
  @failed = true
end

#run ⇒ Object 



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# File 'lib/turbot_runner/script_runner.rb', line 19

def run
  @interrupted = false
  @failed = false

  # Start a thread that spawns a subprocess that runs the script and
  # redirects the script's output to a file at a known location.
  script_thread = Thread.new { run_command(@command) }

  # Wait for the output file to be created, so that we can start to read
  # from it.
  begin
    f = File.open(@output_file)
  rescue Errno::ENOENT
    sleep 0.1
    retry
  end
    
  # Read from output file buildling up lines byte by byte byte by byte
  # until either we reach the end of the file and the script has exited, or
  # @interrupted becomes true.  We cannot use IO#readline here because if
  # only half a line has been synced to the file by the time we read it,
  # then the incomplete line will be read, causing chaos down the line.
  line = ''

  time_of_last_read = Time.now

  until @interrupted do
    byte = f.read(1)
    if byte.nil?
      if script_thread.alive?
        sleep 0.1
        interrupt_and_mark_as_failed if (Time.now - time_of_last_read) > @timeout
      else
        break
      end
    elsif byte == "\n"
      @processor.process(line)
      time_of_last_read = Time.now
      line = ''
    else
      time_of_last_read = Time.now
      line << byte
    end
  end

  # script_thread may still be alive if we exited the loop above becuase
  # @interrupted became true, and so we must kill it.
  kill_running_processes if script_thread.alive?

  @failed ? false : script_thread.join.value
ensure
  f.close if f
end