Class: GetProcessStartTime::CLI

Inherits:
Object
  • Object
show all
Defined in:
lib/get_process_start_time/cli.rb

Instance Method Summary collapse

Instance Method Details

#parse_options(argv = ARGV) ⇒ Object 



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# File 'lib/get_process_start_time/cli.rb', line 6

def parse_options(argv = ARGV)
  self.class.module_eval do
    define_method(:usage) do |msg = nil|
      puts "Usage: get_process_start_time <PID>"
      puts "Or:    get_process_start_time test <PID> <COMPARTOR> <SECONDS>"
      puts ""
      puts "Get starting time of a process with unix timestamp"
      puts ""
      puts "  $ get_process_start_time <PID>"
      puts "  <unix timestamp>"
      puts ""
      puts "Test living duration of a process is less than (or greater than) a given seconds"
      puts ""
      puts "  $ get_process_start_time test_duration <PID> <COMPARTOR> <SECONDS>"
      puts "  $ echo $? # 0 or 1"
      puts ""
      puts "COMPARTOR: -lt (less than) or -gt (greater than)"
      if msg
        puts ""
        puts "ERROR: #{msg}"
      end
      exit 1
    end
  end

  begin
    case argv[0]
    when '-h', '--help'
      usage
    when 'test_duration'
      if argv.size < 4
        usage 'number of arguments must be 4'
      end
      @subcommand = :test_duration
      @pid = Integer(argv[1])
      @comparator = validate_comparator!(argv[2])
      @seconds = Float(argv[3])
    else
      if argv.size < 1
        usage 'number of arguments must be at least 1'
      end
      @subcommand = :show
      @pid = Integer(argv[0])
    end
  rescue => e
    usage e.message
  end
end

#run ⇒ Object 



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# File 'lib/get_process_start_time/cli.rb', line 55

def run
  parse_options
  case @subcommand
  when :show
    show
  when :test_duration
    test_duration
  else
    assert(false)
  end
end

#show ⇒ Object 



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# File 'lib/get_process_start_time/cli.rb', line 67

def show
  puts GetProcessStartTime.start_time(@pid).to_f
end

#test_duration ⇒ Object 



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# File 'lib/get_process_start_time/cli.rb', line 71

def test_duration
  start_time =  GetProcessStartTime.start_time(@pid).to_f
  living_duration = Time.now - start_time
  case @comparator
  when '-lt'
    exit 0 if living_duration.to_f < @seconds
  when '-gt'
    exit 0 if living_duration.to_f > @seconds
  end
  $stderr.puts "test_duration failed (living duration:#{living_duration.to_f} sec)"
  exit 1
end

#validate_comparator!(comparator) ⇒ Object 



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# File 'lib/get_process_start_time/cli.rb', line 84

def validate_comparator!(comparator)
  unless %w[-lt -gt].include?(comparator)
    raise "COMPARATOR must be -lt (less than) or -gt (greater than): #{comparator}"
  end
  comparator
end