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Diffstat (limited to 'railties/lib/commands/process/spinner.rb')
| -rw-r--r-- | railties/lib/commands/process/spinner.rb | 65 |
1 files changed, 65 insertions, 0 deletions
diff --git a/railties/lib/commands/process/spinner.rb b/railties/lib/commands/process/spinner.rb new file mode 100644 index 0000000000..88c8e7cbd0 --- /dev/null +++ b/railties/lib/commands/process/spinner.rb @@ -0,0 +1,65 @@ +require 'optparse' + +def daemonize + exit if fork # Parent exits, child continues. + Process.setsid # Become session leader. + exit if fork # Zap session leader. See [1]. + Dir.chdir "/" # Release old working directory. + File.umask 0000 # Ensure sensible umask. Adjust as needed. + STDIN.reopen "/dev/null" # Free file descriptors and + STDOUT.reopen "/dev/null", "a" # point them somewhere sensible. + STDERR.reopen STDOUT # STDOUT/ERR should better go to a logfile. +end + +OPTIONS = { + :high_interval => 5.0, + :low_interval => 0.5, + :command => File.expand_path(File.dirname(__FILE__) + '/spawner'), + :daemon => false +} + +ARGV.options do |opts| + opts.banner = "Usage: spinner [options]" + + opts.separator "" + + opts.on <<-EOF + Description: + The spinner is a protection loop for the spawner, which will attempt to restart any FCGI processes + that might have been restarted or outright crashed. It's a brute-force attempt that'll just try + to run the spawner every X number of seconds, so it does pose a light load on the server. + + Examples: + spinner # attempts to run the spawner with default settings every second with output on the terminal + spinner -i 3 -d # only run the spawner every 3 seconds and detach from the terminal to become a daemon + spinner -c '/path/to/app/script/process/spawner -p 9000 -i 10' -d # using custom spawner + EOF + + opts.on(" Options:") + + opts.on("-c", "--command=path", String) { |OPTIONS[:command]| } + opts.on("-h", "--high-interval=seconds", Float) { |OPTIONS[:high_interval]| } + opts.on("-l", "--low-interval=seconds", Float) { |OPTIONS[:low_interval]| } + opts.on("-d", "--daemon") { |OPTIONS[:daemon]| } + + opts.separator "" + + opts.on("-h", "--help", "Show this help message.") { puts opts; exit } + + opts.parse! +end + +daemonize if OPTIONS[:daemon] + +trap(OPTIONS[:daemon] ? "TERM" : "INT") { exit } +trap("USR1") do + $interval = ($interval == OPTIONS[:high_interval] ? OPTIONS[:low_interval] : OPTIONS[:high_interval]) + puts "New interval: #{$interval}" +end + +$interval = OPTIONS[:high_interval] + +loop do + system(OPTIONS[:command]) + sleep($interval) +end
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