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#!/usr/local/bin/ruby
require 'optparse'
require 'net/http'
require 'uri'
def nudge(url, iterations)
print "Nudging #{url}: "
iterations.times { Net::HTTP.get_response(URI.parse(url)); print "."; STDOUT.flush }
puts
end
if RUBY_PLATFORM =~ /mswin32/ then abort("Reaper is only for Unix") end
class ProgramProcess
class << self
def process_keywords(action, *keywords)
processes = keywords.collect { |keyword| find_by_keyword(keyword) }.flatten
if processes.empty?
puts "Couldn't find any process matching: #{keywords.join(" or ")}"
else
processes.each do |process|
puts "#{action.capitalize}ing #{process}"
process.send(action)
end
end
end
def find_by_keyword(keyword)
process_lines_with_keyword(keyword).split("\n").collect { |line|
next if line.include?("inq") || line.include?("ps -ax") || line.include?("grep")
pid, *command = line.split
new(pid, command.join(" "))
}.compact
end
private
def process_lines_with_keyword(keyword)
`ps -ax -o 'pid command' | grep #{keyword}`
end
end
def initialize(pid, command)
@pid, @command = pid, command
end
def find
end
def reload
`kill -s HUP #{@pid}`
end
def graceful
`kill -s TERM #{@pid}`
end
def kill
`kill -9 #{@pid}`
end
def usr1
`kill -s USR1 #{@pid}`
end
def to_s
"[#{@pid}] #{@command}"
end
end
OPTIONS = {
:action => "graceful",
:dispatcher => File.expand_path(File.dirname(__FILE__) + '/../../public/dispatch.fcgi'),
:spinner => File.expand_path(File.dirname(__FILE__) + '/spinner'),
:toggle_spin => true,
:iterations => 10,
:nudge => false
}
ARGV.options do |opts|
opts.banner = "Usage: reaper [options]"
opts.separator ""
opts.on <<-EOF
Description:
The reaper is used to reload, gracefully exit, and forcefully exit FCGI processes
running a Rails Dispatcher. This is commonly done when a new version of the application
is available, so the existing processes can be updated to use the latest code.
The reaper actions are:
* reload : Only reloads the application, but not the framework (like the development environment)
* graceful: Marks all of the processes for exit after the next request
* kill : Forcefully exists all processes regardless of whether they're currently serving a request
Graceful exist is the most common and default action. But since the processes won't exist until after
their next request, it's often necessary to ensure that such a request occurs right after they've been
marked. That's what nudging is for.
A nudge is simply a request to a URL where the dispatcher is serving. You should perform one nudge per
FCGI process you have running if they're setup in a round-robin. Be sure to do one nudge per FCGI process
across all your servers. So three servers with 10 processes each should nudge 30 times to be sure all processes
are restarted.
Examples:
reaper -a reload
reaper -n http://www.example.com -i 10 # gracefully exit, nudge 10 times
EOF
opts.on(" Options:")
opts.on("-a", "--action=name", "reload|graceful|kill (default: #{OPTIONS[:action]})", String) { |OPTIONS[:action]| }
opts.on("-d", "--dispatcher=path", "default: #{OPTIONS[:dispatcher]}", String) { |OPTIONS[:dispatcher]| }
opts.on("-s", "--spinner=path", "default: #{OPTIONS[:spinner]}", String) { |OPTIONS[:spinner]| }
opts.on("-t", "--toggle-spin", "Whether to send a USR1 to the spinner before and after the reaping (default: true)") { |OPTIONS[:toggle_spin]| }
opts.on("-n", "--nudge=url", "Should point to URL that's handled by the FCGI process", String) { |OPTIONS[:nudge]| }
opts.on("-i", "--iterations=number", "One nudge per FCGI process running (default: #{OPTIONS[:iterations]})", Integer) { |OPTIONS[:iterations]| }
opts.separator ""
opts.on("-h", "--help", "Show this help message.") { puts opts; exit }
opts.parse!
end
ProgramProcess.process_keywords("usr1", OPTIONS[:spinner]) if OPTIONS[:toggle_spin]
ProgramProcess.process_keywords(OPTIONS[:action], OPTIONS[:dispatcher])
nudge(OPTIONS[:nudge], OPTIONS[:iterations]) if OPTIONS[:nudge]
ProgramProcess.process_keywords("usr1", OPTIONS[:spinner]) if OPTIONS[:toggle_spin]
|
