Class: Bash::Session

Inherits:
Object
  • Object
show all
Defined in:
lib/bash/session.rb,
lib/bash/session/version.rb

Defined Under Namespace

Classes: TimeoutError

Constant Summary collapse

VERSION = 
"0.0.1"

Instance Method Summary collapse

Constructor Details

#initialize(default_timeout = nil) ⇒ Session

Returns a new instance of Session.



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# File 'lib/bash/session.rb', line 9

def initialize(default_timeout=nil)
  start_session
  @default_timeout = default_timeout
  @separator = SecureRandom.hex
end

Instance Method Details

#close ⇒ Object 



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# File 'lib/bash/session.rb', line 49

def close
  return unless @wait_thr.alive?
  return if (Process.kill('TERM', @wait_thr.pid) rescue nil)
  return unless @wait_thr.alive?
  return if (Process.kill('KILL', @wait_thr.pid) rescue nil)
  return unless @wait_thr.alive?
  raise "Could not kill process(PID #{@wait_thr.pid})"
end

#execute(command, options = {}, &callback) ⇒ Object 



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# File 'lib/bash/session.rb', line 15

def execute(command, options={}, &callback)
  exit_status = nil
  out = options[:out]
  timeout = options[:timeout] || @default_timeout

  cmd = command.dup
  cmd << ";" if cmd !~ /[;&]$/
  cmd << "\n" if cmd =~ /#/
  cmd << %Q{DONTEVERUSETHIS=$?; echo "\n#{@separator} $DONTEVERUSETHIS"; echo "exit $DONTEVERUSETHIS"|sh}

  @stdin.puts(cmd)

  until exit_status do
    begin
      data = @outstr.read_nonblock(160000)
      if data.strip =~ /^#{@separator} (\d+)\s*/
        exit_status = $1
        data.gsub!(/\n^#{@separator} (\d+)\s*$/, '')
      end
      callback.call(data) if callback
      out.write data if out
    rescue IO::WaitReadable
      ready = IO.select([@outstr], nil, nil, timeout)
      unless ready
        raise TimeoutError.new("No output received for the last #{timeout} seconds. Timing out...")
      else
        retry
      end
    end
  end

  exit_status.to_i
end