class EventMachine::Protocols::Postgres3

def dispatch_conn_message msg
  case msg
  when AuthentificationClearTextPassword
    raise ArgumentError, "no password specified" if @password.nil?
    send_data PasswordMessage.new(@password).dump
  when AuthentificationCryptPassword
    raise ArgumentError, "no password specified" if @password.nil?
    send_data PasswordMessage.new(@password.crypt(msg.salt)).dump
  when AuthentificationMD5Password
    raise ArgumentError, "no password specified" if @password.nil?
    require 'digest/md5'
    m = Digest::MD5.hexdigest(@password + @user)
    m = Digest::MD5.hexdigest(m + msg.salt)
    m = 'md5' + m
    send_data PasswordMessage.new(m).dump
  when AuthentificationKerberosV4, AuthentificationKerberosV5, AuthentificationSCMCredential
    raise "unsupported authentification"
  when AuthentificationOk
  when ErrorResponse
    raise msg.field_values.join("\t")
  when NoticeResponse
    @notice_processor.call(msg) if @notice_processor
  when ParameterStatus
    @params[msg.key] = msg.value
  when BackendKeyData
    # TODO
    #p msg
  when ReadyForQuery
    # TODO: use transaction status
    pc,@pending_conn = @pending_conn,nil
    pc.succeed true
  else
    raise "unhandled message type"
  end
end