57 lines
1.9 KiB
Ruby
57 lines
1.9 KiB
Ruby
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require 'optparse'
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def daemonize #:nodoc:
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exit if fork # Parent exits, child continues.
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Process.setsid # Become session leader.
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exit if fork # Zap session leader. See [1].
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Dir.chdir "/" # Release old working directory.
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File.umask 0000 # Ensure sensible umask. Adjust as needed.
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STDIN.reopen "/dev/null" # Free file descriptors and
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STDOUT.reopen "/dev/null", "a" # point them somewhere sensible.
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STDERR.reopen STDOUT # STDOUT/ERR should better go to a logfile.
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end
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OPTIONS = {
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:interval => 5.0,
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:command => File.expand_path(RAILS_ROOT + '/script/process/spawner'),
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:daemon => false
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}
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ARGV.options do |opts|
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opts.banner = "Usage: spinner [options]"
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opts.separator ""
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opts.on <<-EOF
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Description:
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The spinner is a protection loop for the spawner, which will attempt to restart any FCGI processes
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that might have been exited or outright crashed. It's a brute-force attempt that'll just try
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to run the spawner every X number of seconds, so it does pose a light load on the server.
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Examples:
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spinner # attempts to run the spawner with default settings every second with output on the terminal
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spinner -i 3 -d # only run the spawner every 3 seconds and detach from the terminal to become a daemon
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spinner -c '/path/to/app/script/process/spawner -p 9000 -i 10' -d # using custom spawner
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EOF
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opts.on(" Options:")
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opts.on("-c", "--command=path", String) { |v| OPTIONS[:command] = v }
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opts.on("-i", "--interval=seconds", Float) { |v| OPTIONS[:interval] = v }
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opts.on("-d", "--daemon") { |v| OPTIONS[:daemon] = v }
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opts.separator ""
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opts.on("-h", "--help", "Show this help message.") { puts opts; exit }
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opts.parse!
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end
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daemonize if OPTIONS[:daemon]
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trap(OPTIONS[:daemon] ? "TERM" : "INT") { exit }
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loop do
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system(OPTIONS[:command])
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sleep(OPTIONS[:interval])
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end
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