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Contents
# frozen_string_literal: true
module GoodJob
#
# Manages daemonization of the current process.
#
class Daemon
# The path of the generated pidfile.
# @return [Pathname,String]
attr_reader :pidfile
# @param pidfile [Pathname,String] Pidfile path
def initialize(pidfile:)
@pidfile = pidfile
end
# Daemonizes the current process and writes out a pidfile.
# @return [void]
def daemonize
check_pid
::Process.daemon
write_pid
end
private
# @return [void]
def write_pid
File.open(pidfile, ::File::CREAT | ::File::EXCL | ::File::WRONLY) { |f| f.write(::Process.pid.to_s) }
at_exit { File.delete(pidfile) if File.exist?(pidfile) } # rubocop:disable Lint/NonAtomicFileOperation
rescue Errno::EEXIST
check_pid
retry
end
# @return [void]
def delete_pid
File.delete(pidfile) if File.exist?(pidfile) # rubocop:disable Lint/NonAtomicFileOperation
end
# @return [void]
def check_pid
case pid_status(pidfile)
when :running, :not_owned
abort "A server is already running. Check #{pidfile}"
when :dead
File.delete(pidfile)
end
end
# @param pidfile [Pathname, String]
# @return [Symbol]
def pid_status(pidfile)
return :exited unless File.exist?(pidfile)
pid = ::File.read(pidfile).to_i
return :dead if pid.zero?
::Process.kill(0, pid) # check process status
:running
rescue Errno::ESRCH
:dead
rescue Errno::EPERM
:not_owned
end
end
end
Version data entries
29 entries across 29 versions & 1 rubygems