This module contains functionality related to starting and stopping the daemon, and code for processing command line input.
This function is called from the daemon executable. It processes ARGV and checks whether the user is asking for `start`, `stop`, `restart`, `status`.
# File lib/rexec/daemon/controller.rb, line 34 def self.daemonize(daemon) case ARGV.shift when 'start' start(daemon) status(daemon) when 'stop' stop(daemon) status(daemon) ProcessFile.cleanup(daemon) when 'restart' stop(daemon) ProcessFile.cleanup(daemon) start(daemon) status(daemon) when 'status' status(daemon) else puts "Invalid command. Please specify start, restart, stop or status." exit end end
This function starts the supplied daemon
# File lib/rexec/daemon/controller.rb, line 57 def self.start(daemon) puts "Starting daemon...".color(:blue) case ProcessFile.status(daemon) when :running $stderr.puts "Daemon already running!".color(:blue) return when :stopped # We are good to go... else $stderr.puts "Daemon in unknown state! Will clear previous state and continue.".color(:red) status(daemon) ProcessFile.clear(daemon) end daemon.prefork daemon.mark_log fork do Process.setsid exit if fork ProcessFile.store(daemon, Process.pid) File.umask 0000 Dir.chdir daemon.working_directory $stdin.reopen "/dev/null" $stdout.reopen daemon.log_file_path, "a" $stdout.sync = true $stderr.reopen $stdout $stderr.sync = true begin daemon.run trap("INT") do daemon.shutdown end rescue $stderr.puts "=== Daemon Exception Backtrace @ #{Time.now.to_s} ===" $stderr.puts "#{$!.class}: #{$!.message}" $!.backtrace.each { |at| $stderr.puts at } $stderr.puts "=== Daemon Crashed ===" $stderr.flush ensure $stderr.puts "=== Daemon Stopping @ #{Time.now.to_s} ===" $stderr.flush end end puts "Waiting for daemon to start...".color(:blue) sleep 0.1 timer = TIMEOUT pid = ProcessFile.recall(daemon) while pid == nil and timer > 0 # Wait a moment for the forking to finish... puts "Waiting for daemon to start (#{timer}/#{TIMEOUT})".color(:blue) sleep 1 # If the daemon has crashed, it is never going to start... break if daemon.crashed? pid = ProcessFile.recall(daemon) timer -= 1 end end
Prints out the status of the daemon
# File lib/rexec/daemon/controller.rb, line 129 def self.status(daemon) case ProcessFile.status(daemon) when :running puts "Daemon status: running pid=#{ProcessFile.recall(daemon)}".color(:green) when :unknown if daemon.crashed? puts "Daemon status: crashed".color(:red) $stdout.flush $stderr.puts "Dumping daemon crash log:".color(:red) daemon.tail_log($stderr) else puts "Daemon status: unknown".color(:red) end when :stopped puts "Daemon status: stopped".color(:blue) end end
Stops the daemon process.
# File lib/rexec/daemon/controller.rb, line 149 def self.stop(daemon) puts "Stopping daemon...".color(:blue) # Check if the pid file exists... unless File.file?(daemon.process_file_path) puts "Pid file not found. Is the daemon running?".color(:red) return end pid = ProcessFile.recall(daemon) # Check if the daemon is already stopped... unless ProcessFile.running(daemon) puts "Pid #{pid} is not running. Has daemon crashed?".color(:red) return end pgid = -Process.getpgid(pid) Process.kill("INT", pgid) sleep 0.1 sleep 1 if ProcessFile.running(daemon) # Kill/Term loop - if the daemon didn't die easily, shoot # it a few more times. attempts = 5 while ProcessFile.running(daemon) and attempts > 0 sig = (attempts >= 2) ? "KILL" : "TERM" puts "Sending #{sig} to process group #{pgid}...".color(:red) Process.kill(sig, pgid) attempts -= 1 sleep 1 end # If after doing our best the daemon is still running (pretty odd)... if ProcessFile.running(daemon) puts "Daemon appears to be still running!".color(:red) return end # Otherwise the daemon has been stopped. ProcessFile.clear(daemon) end
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