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
  @script_config = script_config
  record_handler = options[:record_handler] || BaseHandler.new  # A BaseHandler does nothing
  @processor = Processor.new(self, script_config, record_handler)
  @timeout = options[:timeout] || 86_400
end

Instance Method Details

#interrupt ⇒ Object 



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# File 'lib/turbot_runner/script_runner.rb', line 75

def interrupt
  @interrupted = true
end

#interrupt_and_mark_as_failed ⇒ Object 



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# File 'lib/turbot_runner/script_runner.rb', line 79

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 18

def run
  Dir.chdir(@script_config[:base_directory]) do

    begin
      @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, "r")
      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
  end
end