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- Revision:
- 86
- Log:
Initial import of I2, an Instiki clone.
- Author:
- adh
- Date:
- Mon Oct 16 10:40:36 +0100 2006
- Size:
- 2276 Bytes
- Properties:
- Property svn:executable is set
| 1 | #!/usr/local/bin/ruby |
| 2 | |
| 3 | require 'optparse' |
| 4 | |
| 5 | def daemonize |
| 6 | exit if fork # Parent exits, child continues. |
| 7 | Process.setsid # Become session leader. |
| 8 | exit if fork # Zap session leader. See [1]. |
| 9 | Dir.chdir "/" # Release old working directory. |
| 10 | File.umask 0000 # Ensure sensible umask. Adjust as needed. |
| 11 | STDIN.reopen "/dev/null" # Free file descriptors and |
| 12 | STDOUT.reopen "/dev/null", "a" # point them somewhere sensible. |
| 13 | STDERR.reopen STDOUT # STDOUT/ERR should better go to a logfile. |
| 14 | end |
| 15 | |
| 16 | OPTIONS = { |
| 17 | :high_interval => 5.0, |
| 18 | :low_interval => 0.5, |
| 19 | :command => File.expand_path(File.dirname(__FILE__) + '/spawner'), |
| 20 | :daemon => false |
| 21 | } |
| 22 | |
| 23 | ARGV.options do |opts| |
| 24 | opts.banner = "Usage: spinner [options]" |
| 25 | |
| 26 | opts.separator "" |
| 27 | |
| 28 | opts.on <<-EOF |
| 29 | Description: |
| 30 | The spinner is a protection loop for the spawner, which will attempt to restart any FCGI processes |
| 31 | that might have been restarted or outright crashed. It's a brute-force attempt that'll just try |
| 32 | to run the spawner every X number of seconds, so it does pose a light load on the server. |
| 33 | |
| 34 | Examples: |
| 35 | spinner # attempts to run the spawner with default settings every second with output on the terminal |
| 36 | spinner -i 3 -d # only run the spawner every 3 seconds and detach from the terminal to become a daemon |
| 37 | spinner -c '/path/to/app/script/process/spawner -p 9000 -i 10' -d # using custom spawner |
| 38 | EOF |
| 39 | |
| 40 | opts.on(" Options:") |
| 41 | |
| 42 | opts.on("-c", "--command=path", String) { |OPTIONS[:command]| } |
| 43 | opts.on("-h", "--high-interval=seconds", Float) { |OPTIONS[:high_interval]| } |
| 44 | opts.on("-l", "--low-interval=seconds", Float) { |OPTIONS[:low_interval]| } |
| 45 | opts.on("-d", "--daemon") { |OPTIONS[:daemon]| } |
| 46 | |
| 47 | opts.separator "" |
| 48 | |
| 49 | opts.on("-h", "--help", "Show this help message.") { puts opts; exit } |
| 50 | |
| 51 | opts.parse! |
| 52 | end |
| 53 | |
| 54 | daemonize if OPTIONS[:daemon] |
| 55 | |
| 56 | trap(OPTIONS[:daemon] ? "TERM" : "INT") { exit } |
| 57 | trap("USR1") do |
| 58 | $interval = ($interval == OPTIONS[:high_interval] ? OPTIONS[:low_interval] : OPTIONS[:high_interval]) |
| 59 | puts "New interval: #{$interval}" |
| 60 | end |
| 61 | |
| 62 | $interval = OPTIONS[:high_interval] |
| 63 | |
| 64 | loop do |
| 65 | system(OPTIONS[:command]) |
| 66 | sleep($interval) |
| 67 | end |
