Class: Freyr::PidFile

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

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(path, procname = nil) ⇒ PidFile

Returns a new instance of PidFile.



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# File 'lib/freyr/pid_file.rb', line 3

def initialize path, procname=nil
  @path = path
  @procname = procname
end

Class Method Details

.pid_command_hash(force = false) ⇒ Object 



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# File 'lib/freyr/pid_file.rb', line 61

def pid_command_hash force=false
  @pid_command_hash = nil if force
  @pid_command_hash ||= `ps -eo pid,command`.split("\n").inject({}) do |r, pid|
    if m = pid.match(/^\s*(\d+)\s(.+)$/)
      r[m[2]] = m[1].to_i
    end
    r
  end
end

Instance Method Details

#alive? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/freyr/pid_file.rb', line 12

def alive?
  return unless pid
  Process.getpgid(pid)
  true
rescue Errno::ESRCH
  false
end

#pid(force = false) ⇒ Object 



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# File 'lib/freyr/pid_file.rb', line 26

def pid force=false
  if !force && File.exist?(@path)
    pid_from_file
  elsif @procname
    pid_from_procname
  else
    pid_from_file
  end
end

#pid_from_file ⇒ Object 



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# File 'lib/freyr/pid_file.rb', line 20

def pid_from_file
  return unless File.exist?(@path)
  p = File.open(@path).read.chomp
  p ? p.to_i : nil
end

#pid_from_procname(force = false) ⇒ Object 



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# File 'lib/freyr/pid_file.rb', line 36

def pid_from_procname force=false
  pids = PidFile.pid_command_hash(force)
  
  if procline = pids.keys.find {|p| p.match(@procname)}
    pids[procline]
  end
end

#process_info ⇒ Object 



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# File 'lib/freyr/pid_file.rb', line 8

def process_info
  @proces_info ||= ProcessInfo.new(@pid) if @pid
end

#wait_for_pid(wait = 40, interval = 0.2) ⇒ Object

Raises:



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# File 'lib/freyr/pid_file.rb', line 44

def wait_for_pid wait = 40, interval=0.2
  OUT.puts "Waiting #{wait}s for pid from match of #{@procname.inspect}"

  start = Time.now

  until (pid = pid_from_procname(true)) || (Time.now-start) > wait
    OUT.print '.';OUT.flush
    sleep(interval)
  end

  raise Timeout, "\n Couldn't find pid after" unless pid
  OUT.puts '*'
  pid
end