fn handle_transfer_order()

in fastpay_core/src/authority.rs [82:130]

• 47 lines of code
• 2 McCabe index (conditional complexity)

    fn handle_transfer_order(
        &mut self,
        order: TransferOrder,
    ) -> Result<AccountInfoResponse, FastPayError> {
        // Check the sender's signature and retrieve the transfer data.
        fp_ensure!(
            self.in_shard(&order.transfer.sender),
            FastPayError::WrongShard
        );
        order.check_signature()?;
        let transfer = &order.transfer;
        let sender = transfer.sender;
        fp_ensure!(
            transfer.sequence_number <= SequenceNumber::max(),
            FastPayError::InvalidSequenceNumber
        );
        fp_ensure!(
            transfer.amount > Amount::zero(),
            FastPayError::IncorrectTransferAmount
        );
        match self.accounts.get_mut(&sender) {
            None => fp_bail!(FastPayError::UnknownSenderAccount),
            Some(account) => {
                if let Some(pending_confirmation) = &account.pending_confirmation {
                    fp_ensure!(
                        &pending_confirmation.value.transfer == transfer,
                        FastPayError::PreviousTransferMustBeConfirmedFirst {
                            pending_confirmation: pending_confirmation.value.clone()
                        }
                    );
                    // This exact transfer order was already signed. Return the previous value.
                    return Ok(account.make_account_info(sender));
                }
                fp_ensure!(
                    account.next_sequence_number == transfer.sequence_number,
                    FastPayError::UnexpectedSequenceNumber
                );
                fp_ensure!(
                    account.balance >= transfer.amount.into(),
                    FastPayError::InsufficientFunding {
                        current_balance: account.balance
                    }
                );
                let signed_order = SignedTransferOrder::new(order, self.name, &self.secret);
                account.pending_confirmation = Some(signed_order);
                Ok(account.make_account_info(sender))
            }
        }
    }