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require 'active_support'
require 'optparse'
require 'socket'
require 'fileutils'
def daemonize #:nodoc:
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
class Spawner
def self.record_pid(name = "#{OPTIONS[:process]}.spawner", id = Process.pid)
FileUtils.mkdir_p(OPTIONS[:pids])
File.open(File.expand_path(OPTIONS[:pids] + "/#{name}.pid"), "w+") { |f| f.write(id) }
end
def self.spawn_all
OPTIONS[:instances].times do |i|
port = OPTIONS[:port] + i
print "Checking if something is already running on #{OPTIONS[:address]}:#{port}..."
begin
srv = TCPServer.new(OPTIONS[:address], port)
srv.close
srv = nil
puts "NO"
puts "Starting dispatcher on port: #{OPTIONS[:address]}:#{port}"
FileUtils.mkdir_p(OPTIONS[:pids])
spawn(port)
rescue
puts "YES"
end
end
end
end
class FcgiSpawner < Spawner
def self.spawn(port)
cmd = "#{OPTIONS[:spawner]} -f #{OPTIONS[:dispatcher]} -p #{port} -P #{OPTIONS[:pids]}/#{OPTIONS[:process]}.#{port}.pid"
cmd << " -a #{OPTIONS[:address]}" if can_bind_to_custom_address?
system(cmd)
end
def self.can_bind_to_custom_address?
@@can_bind_to_custom_address ||= /^\s-a\s/.match `#{OPTIONS[:spawner]} -h`
end
end
class MongrelSpawner < Spawner
def self.spawn(port)
cmd =
"mongrel_rails start -d " +
"-a #{OPTIONS[:address]} " +
"-p #{port} " +
"-P #{OPTIONS[:pids]}/#{OPTIONS[:process]}.#{port}.pid " +
"-e #{OPTIONS[:environment]} " +
"-c #{OPTIONS[:rails_root]} " +
"-l #{OPTIONS[:rails_root]}/log/mongrel.log"
# Add prefix functionality to spawner's call to mongrel_rails
# Digging through mongrel's project subversion server, the earliest
# Tag that has prefix implemented in the bin/mongrel_rails file
# is 0.3.15 which also happens to be the earliest tag listed.
# References: http://mongrel.rubyforge.org/svn/tags
if Mongrel::Const::MONGREL_VERSION.to_f >=0.3 && !OPTIONS[:prefix].nil?
cmd = cmd + " --prefix #{OPTIONS[:prefix]}"
end
system(cmd)
end
def self.can_bind_to_custom_address?
true
end
end
begin
require_library_or_gem 'fcgi'
rescue Exception
# FCGI not available
end
begin
require_library_or_gem 'mongrel'
rescue Exception
# Mongrel not available
end
server = case ARGV.first
when "fcgi", "mongrel"
ARGV.shift
else
if defined?(Mongrel)
"mongrel"
elsif RUBY_PLATFORM !~ /(:?mswin|mingw)/ && !silence_stderr { `spawn-fcgi -version` }.blank? && defined?(FCGI)
"fcgi"
end
end
case server
when "fcgi"
puts "=> Starting FCGI dispatchers"
spawner_class = FcgiSpawner
when "mongrel"
puts "=> Starting mongrel dispatchers"
spawner_class = MongrelSpawner
else
puts "Neither FCGI (spawn-fcgi) nor Mongrel was installed and available!"
exit(0)
end
OPTIONS = {
:environment => "production",
:spawner => '/usr/bin/env spawn-fcgi',
:dispatcher => File.expand_path(RELATIVE_RAILS_ROOT + '/public/dispatch.fcgi'),
:pids => File.expand_path(RELATIVE_RAILS_ROOT + "/tmp/pids"),
:rails_root => File.expand_path(RELATIVE_RAILS_ROOT),
:process => "dispatch",
:port => 8000,
:address => '0.0.0.0',
:instances => 3,
:repeat => nil,
:prefix => nil
}
ARGV.options do |opts|
opts.banner = "Usage: spawner [platform] [options]"
opts.separator ""
opts.on <<-EOF
Description:
The spawner is a wrapper for spawn-fcgi and mongrel that makes it
easier to start multiple processes running the Rails dispatcher. The
spawn-fcgi command is included with the lighttpd web server, but can
be used with both Apache and lighttpd (and any other web server
supporting externally managed FCGI processes). Mongrel automatically
ships with with mongrel_rails for starting dispatchers.
The first choice you need to make is whether to spawn the Rails
dispatchers as FCGI or Mongrel. By default, this spawner will prefer
Mongrel, so if that's installed, and no platform choice is made,
Mongrel is used.
Then decide a starting port (default is 8000) and the number of FCGI
process instances you'd like to run. So if you pick 9100 and 3
instances, you'll start processes on 9100, 9101, and 9102.
By setting the repeat option, you get a protection loop, which will
attempt to restart any FCGI processes that might have been exited or
outright crashed.
You can select bind address for started processes. By default these
listen on every interface. For single machine installations you would
probably want to use 127.0.0.1, hiding them form the outside world.
Examples:
spawner # starts instances on 8000, 8001, and 8002
# using Mongrel if available.
spawner fcgi # starts instances on 8000, 8001, and 8002
# using FCGI.
spawner mongrel -i 5 # starts instances on 8000, 8001, 8002,
# 8003, and 8004 using Mongrel.
spawner -p 9100 -i 10 # starts 10 instances counting from 9100 to
# 9109 using Mongrel if available.
spawner -p 9100 -r 5 # starts 3 instances counting from 9100 to
# 9102 and attempts start them every 5
# seconds.
spawner -a 127.0.0.1 # starts 3 instances binding to localhost
EOF
opts.on(" Options:")
opts.on("-p", "--port=number", Integer, "Starting port number (default: #{OPTIONS[:port]})") { |OPTIONS[:port]| }
if spawner_class.can_bind_to_custom_address?
opts.on("-a", "--address=ip", String, "Bind to IP address (default: #{OPTIONS[:address]})") { |OPTIONS[:address]| }
end
opts.on("-p", "--port=number", Integer, "Starting port number (default: #{OPTIONS[:port]})") { |v| OPTIONS[:port] = v }
opts.on("-i", "--instances=number", Integer, "Number of instances (default: #{OPTIONS[:instances]})") { |v| OPTIONS[:instances] = v }
opts.on("-r", "--repeat=seconds", Integer, "Repeat spawn attempts every n seconds (default: off)") { |v| OPTIONS[:repeat] = v }
opts.on("-e", "--environment=name", String, "test|development|production (default: #{OPTIONS[:environment]})") { |v| OPTIONS[:environment] = v }
opts.on("-P", "--prefix=path", String, "URL prefix for Rails app. [Used only with Mongrel > v0.3.15]: (default: #{OPTIONS[:prefix]})") { |v| OPTIONS[:prefix] = v }
opts.on("-n", "--process=name", String, "default: #{OPTIONS[:process]}") { |v| OPTIONS[:process] = v }
opts.on("-s", "--spawner=path", String, "default: #{OPTIONS[:spawner]}") { |v| OPTIONS[:spawner] = v }
opts.on("-d", "--dispatcher=path", String, "default: #{OPTIONS[:dispatcher]}") { |dispatcher| OPTIONS[:dispatcher] = File.expand_path(dispatcher) }
opts.separator ""
opts.on("-h", "--help", "Show this help message.") { puts opts; exit }
opts.parse!
end
ENV["RAILS_ENV"] = OPTIONS[:environment]
if OPTIONS[:repeat]
daemonize
trap("TERM") { exit }
spawner_class.record_pid
loop do
spawner_class.spawn_all
sleep(OPTIONS[:repeat])
end
else
spawner_class.spawn_all
end
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