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require 'optparse'
if RUBY_PLATFORM =~ /(:?mswin|mingw)/ then abort("Inspector is only for Unix") end
OPTIONS = {
:pid_path => File.expand_path(RAILS_ROOT + '/tmp/pids'),
:pattern => "dispatch.*.pid",
:ps => "ps -o pid,state,user,start,time,pcpu,vsz,majflt,command -p %s"
}
class Inspector
def self.inspect(pid_path, pattern)
new(pid_path, pattern).inspect
end
def initialize(pid_path, pattern)
@pid_path, @pattern = pid_path, pattern
end
def inspect
header = `#{OPTIONS[:ps] % 1}`.split("\n")[0] + "\n"
lines = pids.collect { |pid| `#{OPTIONS[:ps] % pid}`.split("\n")[1] }
puts(header + lines.join("\n"))
end
private
def pids
pid_files.collect do |pid_file|
File.read(pid_file).to_i
end
end
def pid_files
Dir.glob(@pid_path + "/" + @pattern)
end
end
ARGV.options do |opts|
opts.banner = "Usage: inspector [options]"
opts.separator ""
opts.on <<-EOF
Description:
Displays system information about Rails dispatchers (or other processes that use pid files) through
the ps command.
Examples:
inspector # default ps on all tmp/pids/dispatch.*.pid files
inspector -s 'ps -o user,start,majflt,pcpu,vsz -p %s' # custom ps, %s is where the pid is interleaved
EOF
opts.on(" Options:")
opts.on("-s", "--ps=command", "default: #{OPTIONS[:ps]}", String) { |v| OPTIONS[:ps] = v }
opts.on("-p", "--pidpath=path", "default: #{OPTIONS[:pid_path]}", String) { |v| OPTIONS[:pid_path] = v }
opts.on("-r", "--pattern=pattern", "default: #{OPTIONS[:pattern]}", String) { |v| OPTIONS[:pattern] = v }
opts.separator ""
opts.on("-h", "--help", "Show this help message.") { puts opts; exit }
opts.parse!
end
Inspector.inspect(OPTIONS[:pid_path], OPTIONS[:pattern])
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