Get a single wallet.

        @param the name of the wallet.
        @return the wallet's total.
        @raise ServerError

def get_wallet(self, wallet_name):
        """Get a single wallet.

        @param the name of the wallet.
        @return the wallet's total.
        @raise ServerError
        """
        response = make_request(
            '{}wallet/{}'.format(self.url, wallet_name),
            timeout=self.timeout,
            client=self._client)
        try:
            total = response['total']
            return {
                'credit': response['credit'],
                'limit': response['limit'],
                'total': WalletTotal(
                    limit=total['limit'],
                    budgeted=total['budgeted'],
                    available=total['available'],
                    unallocated=total['unallocated'],
                    usage=total['usage'],
                    consumed=total['consumed'])
            }
        except Exception as exc:
            log.error(
                'cannot get wallet from server: {!r}'.format(exc))
            raise ServerError(
                'unable to get list of wallets: {!r}'.format(exc))