def convert(session, event, account_from, account_to, amount):
if account_from.currency == account_to.currency:
return
if account_from.user != account_to.user:
raise PermissionDeniedException('Cannot convert currency externally.')
rate = session.query(CurrencyRate).filter(
CurrencyRate.currency_from_id == account_from.currency.id,
CurrencyRate.currency_to_id == account_to.currency.id).first()
if not rate:
raise DBRecordNotFound(
'There\'s no currency convert rate needed for the operation.')
converted_amount = amount * rate.value
transaction = Transaction()
transaction.value = converted_amount
transaction.type = Transaction.TYPE_CONVERT
transaction.event = event
transaction.account_from = account_from
transaction.account_to = account_to
account_from.balance -= amount
account_to.balance += converted_amount
session.add(transaction)
return converted_amount
def transfer(session, event, account_from, account_to, amount, fee_account):
if account_from == account_to:
return
if account_from.currency != account_to.currency:
raise TransferDifferentCurrenciesException()
transfer_transaction = Transaction()
transfer_transaction.value = amount
transfer_transaction.type = Transaction.TYPE_TRANSFER
transfer_transaction.event = event
transfer_transaction.account_from = account_from
transfer_transaction.account_to = account_to
session.add(transfer_transaction)
account_from.balance -= amount
account_to.balance += amount
fee_type = Fee.TYPE_INTERNAL_TRANSFER
if account_from.user != account_to.user:
fee_type = Fee.TYPE_EXTERNAL_TRANSFER
fee_percent = app.config.get('DEFAULT_FEE')
fee = session.query(Fee).filter(Fee.type == fee_type).one()
if fee:
fee_percent = fee.percent
if fee_percent > 0:
fee_amount = amount * fee.percent
fee_transaction = Transaction()
fee_transaction.value = fee_amount
fee_transaction.type = Transaction.TYPE_FEE
fee_transaction.event = event
fee_transaction.account_from = account_from
fee_transaction.account_to = fee_account
session.add(fee_transaction)
account_from.balance -= fee_amount
fee_account.balance += fee_amount
