celluloid/celluloid-dns

# Copyright, 2015, by Samuel G. D. Williams. <http://www.codeotaku.com>
# 
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
# 
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
# 
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.

require 'resolv'
require 'resolv-replace'

module Celluloid::DNS
    module Replace
        class << self
            attr :resolver, true
            
            def resolver?
                resolver != nil
            end
        
            def get_address(host)
                begin
                    resolver.addresses_for(host).sample.to_s
                rescue ResolutionFailure
                    raise SocketError, "Hostname not known: #{host}"
                end
            end
        end
    end
    
    class << IPSocket
        @@resolver = nil
        
        def getaddress(host)
            if Replace.resolver?
                Replace.get_address(host)
            else
                original_resolv_getaddress(host)
            end
        end
    end
end