vhost proxypass migration

408-3-vhost_switch_proxypass_from_rewrite.rb

#!/usr/bin/env oo-ruby
=begin
Author: Vincent Batts <vbatts@redhat.com>
Data:  Fri Feb 28 15:42:09 EST 2014
Description: Migration script for https://trello.com/c/q1ro2vDB/408-3-use-proxy-pass-for-virtual-hosts-plugin-instead-of-mod-rewrite
             NOTE: this only applies to setups that are using the vhost plugin, namely OSE
=end

require "find"
require "json"
require "tempfile"

NODE_CONF="/etc/openshift/node.conf"
# this is likely a symlink, so add the / so we can find on it
OPENSHIFT_HTTP_CONF_DIR=`source #{NODE_CONF} && echo $OPENSHIFT_HTTP_CONF_DIR`.chomp + "/"
BACKUP_SUFFIX=".bak.#{$$}"

Find.find(OPENSHIFT_HTTP_CONF_DIR) do |path|
  next unless FileTest.file?(path) && path.end_with?("element-.conf")
  tfh = Tempfile.new("oo_proxypass")
  fh = File.open(path, "a+")
  fh.seek(0)
  line = fh.readline()
  tfh.puts(line)
  data = JSON.load(line.split("ELEMENT: ").last())
  puts "#{ARGV[0]}: found #{path}"
  # data is like:
  # ["", "127.1.244.1:8080", {"websocket"=>true, "protocols"=>["http", "ws"]}]
  tpath = data[0].length > 0 ? data[0] : "/"
  data.last["protocols"].each do |proto|
    next if proto == "ws" # httpd doesn't do 'ws'
    tfh.puts("ProxyPass #{tpath} #{proto}://#{data[1]}/")
  end
  # finish copying/assembling the tempfile
  loop do
    begin
      line = fh.readline()
    rescue EOFError
      break
    end
    next if line =~ /^RewriteRule/ # skip these
    tfh.puts(line)
  end
  tfh.close()
  fh.close()
  backup_path="#{fh.path}#{BACKUP_SUFFIX}"
  IO.copy_stream(fh.path, backup_path)
  puts "#{ARGV[0]}: backed up to #{backup_path}"
  IO.copy_stream(tfh.path, fh.path)
  puts "#{ARGV[0]}: wrote new data to #{fh.path}"
end