A simpler daemon library for Ruby processes.
require "fallen" module Azazel extend def self.run while running? puts "Time is on my side... Yes it is..." sleep 666 end end end Azazel.start!
This will print Time is on my side... Yes it is.. every 666 seconds on
STDOUT. You can stop the daemon by pressing
Control your daemon
Fallen accepts the following methods:
daemonize!: detaches the process and keep running it on background;
chdir!: changes the current working directory of the process (useful for log and pid files);
pid_file: allows to indicate a file path where the daemon
PIDwill be stored; could be either an absolute path or a relative path to the current working directory (see
stdin: redirects the process
STDINto either an absolute or relative file path; note that when a process is daemonized by default all these streams are redirected to
For example, the previous example could have the following lines before
Azazel.start! to store the
PID and log to a file:
Azazel.pid_file "/var/run/azazel.pid" Azazel.stdout "/var/log/azazel.log" Azazel.daemonize! Azazel.start!
Fallen supports command line parameters, by default using the
clap gem. In order to enable command line support you need to do the following:
require "fallen" require "fallen/cli" module Azazel extend extend :: # ... def usage puts "..." # Your usage message # Default Fallen usage options puts fallen_usage end end case Clap.run(ARGV, Azazel.cli).first when "start" Azazel.start! when "stop" Azazel.stop! else Azazel.usage end
Azazel.usage will print the following:
Fallen introduced command line arguments: -D Daemonize this process -C Change directory. -P Path to PID file. Only used in daemonized process. -out Path to redirect STDOUT. -err Path to redirect STDERR. -in Path to redirect STDIN.
UNLICENSE file included with this gem distribution.