You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: sasl.rb
    path of file: ./repos/ruby-net-ldap/lib/net/ldap/auth_adapter
    
    the code of the file until where you have to start completion: require_relative '../auth_adapter'

module Net
  class LDAP
    class AuthAdapter
      class Sasl < Net::LDAP::AuthAdapter
        MAX_SASL_CHALLENGES = 10

        #--
        # Required parameters: :mechanism, :initial_credential and
        # :challenge_response
        #
        # Mechanism is a
    
        def bind(auth)
          mech, cred, chall = auth[:mechanism], auth[:initial_credential],
            auth[:challenge_response]
          raise Net::LDAP::BindingInformationInvalidError, "Invalid binding information" unless mech && cred && chall

          message_id = @connection.next_msgid

          n = 0
          loop do
            sasl = [mech.to_ber, cred.to_ber].to_ber_contextspecific(3)
            request = [
              Net::LDAP::Connection::LdapVersion.to_ber, "".to_ber, sasl
            ].to_ber_appsequence(Net::LDAP::PDU::BindRequest)

            @connection.send(:write, request, nil, message_id)
            pdu = @connection.queued_read(message_id)

            if !pdu || pdu.app_tag != Net::LDAP::PDU::BindResult
              raise Net::LDAP::NoBindResultError, "no bind result"
            end

            return pdu unless pdu.result_code == Net::LDAP::ResultCodeSaslBindInProgress
            raise Net::LDAP::SASLChallengeOverflowError, "sasl-challenge overflow" if ((n += 1) > MAX_SASL_CHALLENGES)

            cred = chall.call(pdu.result_server_sasl_creds)
          end