Method: Async::DNS::System.resolver

Defined in:
lib/async/dns/system.rb

.resolver(**options) ⇒ Object

Get a list of standard nameserver connections which can be used for querying any standard servers that the system has been configured with. There is no equivalent facility to use the ‘hosts` file at present.



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# File 'lib/async/dns/system.rb', line 166

def self.resolver(**options)
	nameservers = []
	
	if File.exist? RESOLV_CONF
		options.update(parse_resolv_configuration(RESOLV_CONF))
		nameservers = options.delete(:nameservers)
	elsif defined?(Win32::Resolv) and RUBY_PLATFORM =~ /mswin32|cygwin|mingw|bccwin/
		search, nameservers = Win32::Resolv.get_resolv_info
		options.update(search: search)
	end
	
	if search = options[:search]
		unless search.include?(".")
			search << nil
		end
	else
		options[:search] = [nil]
	end
	
	if hosts = Hosts.local
		cache = options.fetch(:cache) do
			options[:cache] = Cache.new
		end
		
		hosts.each do |name, addresses|
			addresses.each do |address|
				resource = Resource.new(address, nil)
				case address
				when Resolv::IPv4
					cache.store(name, Resolv::DNS::Resource::IN::A, resource)
				when Resolv::IPv6
					cache.store(name, Resolv::DNS::Resource::IN::AAAA, resource)
				end
			end
		end
	end
	
	timeout = options.delete(:timeout) || DEFAULT_TIMEOUT
	endpoint = Endpoint.for(nameservers, timeout: timeout)
	
	if block_given?
		yield endpoint, **options
	else
		return Resolver.new(endpoint, **options)
	end
end