Module: MogilefsdLogTailer

Defined in:
lib/mogilefsd_log_tailer.rb,
lib/mogilefsd_log_tailer/version.rb,
lib/mogilefsd_log_tailer/tail_handler.rb

Defined Under Namespace

Classes: TailHandler

Constant Summary collapse

VERSION = 
"0.0.2"

Class Method Summary collapse

Class Method Details

.parse_options! ⇒ Object 



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# File 'lib/mogilefsd_log_tailer.rb', line 7

def self.parse_options!
  hosts = []
  filename = nil
  daemonize = false

  OptionParser.new do |o|
    script_name = File.basename($0)
    o.set_summary_indent('  ')
    o.banner = "#{script_name} version #{VERSION}\nUsage: #{script_name} [options] tracker1:port1 tracker2:port2 ..."
    o.separator ""
    o.on("-d", "--[no-]daemonize", "Run as a daemon.") { |d| daemonize = d }
    o.on("-f", "--file FILE", "The log file to which the output should go.") { |n| filename = File.expand_path(n) }
    o.on("-h", "--help", "Show this help message.") { puts o; exit }
  end.parse!

  while (h = ARGV.shift)
    hosts << h
  end

  if hosts.empty?
    STDERR.puts("No hosts to tail.")
    exit(1)
  end

  [
    hosts,
    {
      :daemonize => daemonize,
      :filename => filename,
    },
  ]
end

.run ⇒ Object 



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# File 'lib/mogilefsd_log_tailer.rb', line 40

def self.run
  hosts, options = parse_options!

  log_dir = File.expand_path(File.join(File.dirname(__FILE__), '..'))
  if options[:filename]
    log_dir = File.dirname(options[:filename])
  end

  if options[:daemonize]
    Daemons.daemonize(
      :app_name => 'mogilefsd_log_tailer',
      :dir_mode => :normal,
      :dir => log_dir,
      :log_output => true
      )
  end

  EventMachine.run do
    hosts.each do |hp|
      host, port = hp.split(':')
      EventMachine.connect(host, port.to_i, TailHandler, host, options[:filename])
    end
  end
end