Class: Assassin

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

Constant Summary collapse

Version = 
'1.4.2'

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(child_pid, options = {}) ⇒ Assassin

Returns a new instance of Assassin.



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# File 'lib/assassin.rb', line 28

def initialize(child_pid, options = {})
  @child_pid = child_pid.to_s.to_i
  @parent_pid = Process.pid
  @options = Assassin.options_for(options)
  @pid, @path = Assassin.generate(@child_pid, @options)
end

Instance Attribute Details

#child_pid ⇒ Object

Returns the value of attribute child_pid.



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# File 'lib/assassin.rb', line 24

def child_pid
  @child_pid
end

#parent_pid ⇒ Object

Returns the value of attribute parent_pid.



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# File 'lib/assassin.rb', line 23

def parent_pid
  @parent_pid
end

#path ⇒ Object

Returns the value of attribute path.



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# File 'lib/assassin.rb', line 26

def path
  @path
end

#pid ⇒ Object

Returns the value of attribute pid.



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# File 'lib/assassin.rb', line 25

def pid
  @pid
end

Class Method Details

.at_exit_kill(*args, &block) ⇒ Object 



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# File 'lib/assassin.rb', line 15

def Assassin.at_exit_kill(*args, &block)
  new(*args, &block)
end

.ate(*args, &block) ⇒ Object 



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# File 'lib/assassin.rb', line 19

def Assassin.ate(*args, &block)
  new(*args, &block)
end

.description ⇒ Object 



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# File 'lib/assassin.rb', line 11

def Assassin.description
  'no zombies ever, not even on `exit!` or `kill -9`'
end

.generate(child_pid, options = {}) ⇒ Object 



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# File 'lib/assassin.rb', line 39

def Assassin.generate(child_pid, options = {})
  path = File.join(Dir.tmpdir, "assassin-#{ child_pid }-#{ SecureRandom.uuid }.rb")
  script = Assassin.script_for(child_pid, options)
  IO.binwrite(path, script)
  pid = Process.spawn "ruby #{ path }"
  [pid, path]
end

.options_for(options) ⇒ Object 



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# File 'lib/assassin.rb', line 35

def Assassin.options_for(options)
  options.inject({}){|h, kv| k,v = kv; h.update(k.to_s.to_sym => v)}
end

.script_for(child_pid, options = {}) ⇒ Object 



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# File 'lib/assassin.rb', line 47

def Assassin.script_for(child_pid, options = {})
  parent_pid = Process.pid
  delay = (options[:delay] || 0.42).to_f

  script = <<-__
    Process.daemon

    require 'fileutils'
    at_exit{ FileUtils.rm_f(__FILE__) }

    parent_pid = #{ parent_pid }
    child_pid = #{ child_pid }
    delay = #{ delay }

    m = 24*60*60
    n = 42
    
    m.times do
      begin
        Process.kill(0, parent_pid)
      rescue Object => e
        sleep(delay)

        if e.is_a?(Errno::ESRCH)
          n.times do
            begin
              Process.kill(15, child_pid) rescue nil
              sleep(rand + rand)
              Process.kill(9, child_pid) rescue nil
              sleep(rand + rand)
              Process.kill(0, child_pid)
            rescue Errno::ESRCH
              break
            end
          end
        end

        exit
      end

      sleep(1)
    end
  __

  return script
end

.version ⇒ Object 



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

def Assassin.version
  Version
end