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#!/usr/local/bin/ruby
require 'drb'
# This file includes an experimental gateway CGI implementation. It will work
# only on platforms which support both fork and sockets.
#
# To enable it edit public/.htaccess and replace dispatch.cgi with gateway.cgi.
#
# Next, create the directory log/drb_gateway and grant the apache user rw access
# to said directory.
#
# On the next request to your server, the gateway tracker should start up, along
# with a few listener processes. This setup should provide you with much better
# speeds than dispatch.cgi.
#
# Keep in mind that the first request made to the server will be slow, as the
# tracker and listeners will have to load. Also, the tracker and listeners will
# shutdown after a period if inactivity. You can set this value below -- the
# default is 90 seconds.
TrackerSocket = File.expand_path(File.join(File.dirname(__FILE__), '../log/drb_gateway/tracker.sock'))
DieAfter = 90 # Seconds
Listeners = 3
def message(s)
$stderr.puts "gateway.cgi: #{s}" if ENV && ENV["DEBUG_GATEWAY"]
end
def listener_socket(number)
File.expand_path(File.join(File.dirname(__FILE__), "../log/drb_gateway/listener_#{number}.sock"))
end
unless File.exist? TrackerSocket
message "Starting tracker and #{Listeners} listeners"
fork do
Process.setsid
STDIN.reopen "/dev/null"
STDOUT.reopen "/dev/null", "a"
root = File.expand_path(File.dirname(__FILE__) + '/..')
message "starting tracker"
fork do
ARGV.clear
ARGV << TrackerSocket << Listeners.to_s << DieAfter.to_s
load File.join(root, 'script', 'tracker')
end
message "starting listeners"
require File.join(root, 'config/environment.rb')
Listeners.times do |number|
fork do
ARGV.clear
ARGV << listener_socket(number) << DieAfter.to_s
load File.join(root, 'script', 'listener')
end
end
end
message "waiting for tracker and listener to arise..."
ready = false
10.times do
sleep 0.5
break if (ready = File.exist?(TrackerSocket) && File.exist?(listener_socket(0)))
end
if ready
message "tracker and listener are ready"
else
message "Waited 5 seconds, listener and tracker not ready... dropping request"
Kernel.exit 1
end
end
DRb.start_service
message "connecting to tracker"
tracker = DRbObject.new_with_uri("drbunix:#{TrackerSocket}")
input = $stdin.read
$stdin.close
env = ENV.inspect
output = nil
tracker.with_listener do |number|
message "connecting to listener #{number}"
socket = listener_socket(number)
listener = DRbObject.new_with_uri("drbunix:#{socket}")
output = listener.process(env, input)
message "listener #{number} has finished, writing output"
end
$stdout.write output
$stdout.flush
$stdout.close
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