Class: IptablesWeb::Cli::PidFile

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

Defined Under Namespace

Classes: AlreadyLaunched, AnotherLaunched, PidFileException

Instance Method Summary collapse

Constructor Details

#initialize(pidfile_path) ⇒ PidFile

Returns a new instance of PidFile.



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# File 'lib/iptables_web/cli/pid_file.rb', line 5

def initialize(pidfile_path)
  @pidfile = pidfile_path
end

Instance Method Details

#another_exist? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/iptables_web/cli/pid_file.rb', line 33

def another_exist?
  process_exist? && other?
end

#create ⇒ Object

Raises:



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# File 'lib/iptables_web/cli/pid_file.rb', line 9

def create
  raise AnotherLaunched.new("Another process with #{pid} already launched!") if another_exist?
  logged_say("Create pidfile #{self} for pid #{Process.pid}")
  logged_say("Grab pidfile #{self} for pid #{Process.pid} due process #{pid} is down.") if other?
  File.open(@pidfile, 'w') do |file|
    file.write(Process.pid)
  end
  pid
end

#delete ⇒ Object

Raises:



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# File 'lib/iptables_web/cli/pid_file.rb', line 19

def delete
  raise AnotherLaunched.new("Delete error. Another process with #{pid} already launched!") if another_exist?
  logged_say("Delete pidfile #{self} for pid #{pid}")
  File.unlink(@pidfile) if exist?
end

#exist? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/iptables_web/cli/pid_file.rb', line 47

def exist?
  ::File.exists?(@pidfile)
end

#other? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/iptables_web/cli/pid_file.rb', line 37

def other?
  pid > 0 && Process.pid != pid
end

#pid ⇒ Object 



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# File 'lib/iptables_web/cli/pid_file.rb', line 25

def pid
  if exist?
    File.read(@pidfile).to_i
  else
    0
  end
end

#process_exist? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/iptables_web/cli/pid_file.rb', line 41

def process_exist?
  pid > 0 && Process.kill(0, pid)
rescue Errno::ESRCH
  false
end

#to_s ⇒ Object 



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# File 'lib/iptables_web/cli/pid_file.rb', line 51

def to_s
  @pidfile
end