Hank Beaver

This example uses Ruby to telnet into Varnish and issue the “url.purge .*” command. The only gotcha is that the varnish telnet server does not issue a command prompt which causes Ruby telnet to timeout and get cranky. Well a little exception handling hacks past this. Enjoy.

require 'rubygems'

namespace "varnish" do

  desc "Purge ALL urls from Varnish"
  task :global_purge => :environment do

    #It WILL timeout, just accept it. Varnish does not have a command prompt.
    require 'net/telnet'
    @result = ""
    begin
      localhost = Net::Telnet::new("Host" => "localhost",
      "Port" => 6082,
      "Timeout" => 5)
      localhost.cmd("url.purge .*") { |c| @result = c}
    rescue Exception
      if @result.include? ("200 0")
        puts "varnish purged OK."
      else
        raise "Varnish not purged."
      end
    end
  end

end