vendor/rails/railties/lib/commands/process/inspector.rb

   1 require 'optparse'
   2
   3 if RUBY_PLATFORM =~ /(:?mswin|mingw)/ then abort("Inspector is only for Unix") end
   4
   5 OPTIONS = {
   6   :pid_path => File.expand_path(RAILS_ROOT + '/tmp/pids'),
   7   :pattern  => "dispatch.*.pid",
   8   :ps       => "ps -o pid,state,user,start,time,pcpu,vsz,majflt,command -p %s"
   9 }
  10
  11 class Inspector
  12   def self.inspect(pid_path, pattern)
  13     new(pid_path, pattern).inspect
  14   end
  15
  16   def initialize(pid_path, pattern)
  17     @pid_path, @pattern = pid_path, pattern
  18   end
  19
  20   def inspect
  21     header = `#{OPTIONS[:ps] % 1}`.split("\n")[0] + "\n"
  22     lines  = pids.collect { |pid| `#{OPTIONS[:ps] % pid}`.split("\n")[1] }
  23
  24     puts(header + lines.join("\n"))
  25   end
  26
  27   private
  28     def pids
  29       pid_files.collect do |pid_file|
  30         File.read(pid_file).to_i
  31       end
  32     end
  33
  34     def pid_files
  35       Dir.glob(@pid_path + "/" + @pattern)
  36     end
  37 end
  38
  39
  40 ARGV.options do |opts|
  41   opts.banner = "Usage: inspector [options]"
  42
  43   opts.separator ""
  44
  45   opts.on <<-EOF
  46   Description:
  47     Displays system information about Rails dispatchers (or other processes that use pid files) through
  48     the ps command.
  49
  50   Examples:
  51     inspector                                             # default ps on all tmp/pids/dispatch.*.pid files
  52     inspector -s 'ps -o user,start,majflt,pcpu,vsz -p %s' # custom ps, %s is where the pid is interleaved
  53   EOF
  54
  55   opts.on("  Options:")
  56
  57   opts.on("-s", "--ps=command", "default: #{OPTIONS[:ps]}", String)           { |v| OPTIONS[:ps] = v }
  58   opts.on("-p", "--pidpath=path", "default: #{OPTIONS[:pid_path]}", String)   { |v| OPTIONS[:pid_path] = v }
  59   opts.on("-r", "--pattern=pattern", "default: #{OPTIONS[:pattern]}", String) { |v| OPTIONS[:pattern] = v }
  60
  61   opts.separator ""
  62
  63   opts.on("-h", "--help", "Show this help message.") { puts opts; exit }
  64
  65   opts.parse!
  66 end
  67
  68 Inspector.inspect(OPTIONS[:pid_path], OPTIONS[:pattern])