module EventMachine::DnsResolver

# File lib/em-dns-resolver.rb, line 45
def self.nameserver_port
  return @nameserver_port if defined? @nameserver_port
  config_hash = ::Resolv::DNS::Config.default_config_hash
  @nameserver_port = if config_hash.include? :nameserver
    [ config_hash[:nameserver].first, Port ]
  elsif config_hash.include? :nameserver_port
    config_hash[:nameserver_port].first
  else
    [ '0.0.0.0', Port ]
  end
end

# File lib/em-dns-resolver.rb, line 42
def self.nameserver_port= (ns_p)
  @nameserver_port = ns_p
end

# File lib/em-dns-resolver.rb, line 12
def self.resolve(hostname)
  type = Resolv::DNS::Resource::IN::A
  if ::Resolv::AddressRegex =~ hostname
    # hostname contains an IP address, nothing to resolve
    Request.new(nil, hostname, type)
  else
    Request.new(socket, hostname, type)
  end
end

# File lib/em-dns-resolver.rb, line 22
def self.reverse(address)
  case address
  when Resolv::IPv4::Regex
    ptr = Resolv::IPv4.create(address).to_name
  when Resolv::IPv6::Regex
    ptr = Resolv::IPv6.create(address).to_name
  else
    raise ArgumentError, "invalid address: #{address}"
  end
  Request.new(socket, ptr, Resolv::DNS::Resource::IN::PTR)
end

# File lib/em-dns-resolver.rb, line 34
def self.socket
  if defined?(@socket) && @socket.connected?
    @socket
  else
    @socket = DnsSocket.open
  end
end