class CreditTransfer(ManyOrgBase, BlockchainTaskableBase):
__tablename__ = 'credit_transfer'
uuid = db.Column(db.String, unique=True)
resolved_date = db.Column(db.DateTime)
_transfer_amount_wei = db.Column(db.Numeric(27), default=0)
transfer_type = db.Column(db.Enum(TransferTypeEnum), index=True)
transfer_subtype = db.Column(db.Enum(TransferSubTypeEnum))
transfer_status = db.Column(db.Enum(TransferStatusEnum),
default=TransferStatusEnum.PENDING)
transfer_mode = db.Column(db.Enum(TransferModeEnum))
transfer_use = db.Column(JSON)
transfer_metadata = db.Column(JSONB)
exclude_from_limit_calcs = db.Column(db.Boolean, default=False)
resolution_message = db.Column(db.String())
token_id = db.Column(db.Integer, db.ForeignKey(Token.id))
sender_transfer_account_id = db.Column(
db.Integer, db.ForeignKey("transfer_account.id"))
recipient_transfer_account_id = db.Column(
db.Integer, db.ForeignKey("transfer_account.id"))
sender_blockchain_address_id = db.Column(
db.Integer, db.ForeignKey("blockchain_address.id"))
recipient_blockchain_address_id = db.Column(
db.Integer, db.ForeignKey("blockchain_address.id"))
sender_user_id = db.Column(db.Integer,
db.ForeignKey("user.id"),
index=True)
recipient_user_id = db.Column(db.Integer, db.ForeignKey("user.id"))
attached_images = db.relationship('UploadedResource',
backref='credit_transfer',
lazy=True)
fiat_ramp = db.relationship('FiatRamp',
backref='credit_transfer',
lazy=True,
uselist=False)
__table_args__ = (Index('updated_index', "updated"), )
from_exchange = db.relationship('Exchange',
backref='from_transfer',
lazy=True,
uselist=False,
foreign_keys='Exchange.from_transfer_id')
to_exchange = db.relationship('Exchange',
backref='to_transfer',
lazy=True,
uselist=False,
foreign_keys='Exchange.to_transfer_id')
# TODO: Apply this to all transfer amounts/balances, work out the correct denominator size
@hybrid_property
def transfer_amount(self):
return (self._transfer_amount_wei or 0) / int(1e16)
@transfer_amount.setter
def transfer_amount(self, val):
self._transfer_amount_wei = val * int(1e16)
def send_blockchain_payload_to_worker(self,
is_retry=False,
queue='high-priority'):
sender_approval = self.sender_transfer_account.get_or_create_system_transfer_approval(
)
recipient_approval = self.recipient_transfer_account.get_or_create_system_transfer_approval(
)
self.blockchain_task_uuid = bt.make_token_transfer(
signing_address=self.sender_transfer_account.organisation.
system_blockchain_address,
token=self.token,
from_address=self.sender_transfer_account.blockchain_address,
to_address=self.recipient_transfer_account.blockchain_address,
amount=self.transfer_amount,
prior_tasks=list(
filter(lambda x: x is not None, [
sender_approval.eth_send_task_uuid,
sender_approval.approval_task_uuid,
recipient_approval.eth_send_task_uuid,
recipient_approval.approval_task_uuid
])),
queue=queue)
def resolve_as_completed(self,
existing_blockchain_txn=None,
queue='high-priority'):
self.check_sender_transfer_limits()
self.resolved_date = datetime.datetime.utcnow()
self.transfer_status = TransferStatusEnum.COMPLETE
self.sender_transfer_account.decrement_balance(self.transfer_amount)
self.recipient_transfer_account.increment_balance(self.transfer_amount)
if self.transfer_type == TransferTypeEnum.PAYMENT and self.transfer_subtype == TransferSubTypeEnum.DISBURSEMENT:
if self.recipient_user and self.recipient_user.transfer_card:
self.recipient_user.transfer_card.update_transfer_card()
if self.fiat_ramp and self.transfer_type in [
TransferTypeEnum.DEPOSIT, TransferTypeEnum.WITHDRAWAL
]:
self.fiat_ramp.resolve_as_completed()
if not existing_blockchain_txn:
self.send_blockchain_payload_to_worker(queue=queue)
def resolve_as_rejected(self, message=None):
if self.fiat_ramp and self.transfer_type in [
TransferTypeEnum.DEPOSIT, TransferTypeEnum.WITHDRAWAL
]:
self.fiat_ramp.resolve_as_rejected()
self.resolved_date = datetime.datetime.utcnow()
self.transfer_status = TransferStatusEnum.REJECTED
if message:
self.resolution_message = message
def get_transfer_limits(self):
import server.utils.transfer_limits
return server.utils.transfer_limits.get_transfer_limits(self)
def check_sender_transfer_limits(self):
if self.sender_user is None:
# skip if there is no sender, which implies system send
return
relevant_transfer_limits = self.get_transfer_limits()
for limit in relevant_transfer_limits:
if limit.no_transfer_allowed:
raise NoTransferAllowedLimitError(token=self.token.name)
if limit.transfer_count is not None:
# GE Limits
transaction_count = limit.apply_all_filters(
self,
db.session.query(
func.count(CreditTransfer.id).label('count'))
).execution_options(show_all=True).first().count
if (transaction_count or 0) > limit.transfer_count:
message = 'Account Limit "{}" reached. Allowed {} transaction per {} days'\
.format(limit.name, limit.transfer_count, limit.time_period_days)
self.resolve_as_rejected(message=message)
raise TransferCountLimitError(
transfer_count_limit=limit.transfer_count,
limit_time_period_days=limit.time_period_days,
token=self.token.name,
message=message)
if limit.transfer_balance_fraction is not None:
allowed_transfer = limit.transfer_balance_fraction * self.sender_transfer_account.balance
if self.transfer_amount > allowed_transfer:
message = 'Account % Limit "{}" reached. {} available'.format(
limit.name, max(allowed_transfer, 0))
self.resolve_as_rejected(message=message)
raise TransferBalanceFractionLimitError(
transfer_balance_fraction_limit=limit.
transfer_balance_fraction,
transfer_amount_avail=int(allowed_transfer),
limit_time_period_days=limit.time_period_days,
token=self.token.name,
message=message)
if limit.total_amount is not None:
# Sempo Compliance Account Limits
transaction_volume = limit.apply_all_filters(
self,
db.session.query(
func.sum(CreditTransfer.transfer_amount).label('total')
)).execution_options(show_all=True).first().total or 0
if transaction_volume > limit.total_amount:
# Don't include the current transaction when reporting amount available
amount_avail = limit.total_amount - transaction_volume + int(
self.transfer_amount)
message = 'Account Limit "{}" reached. {} available'.format(
limit.name, max(amount_avail, 0))
self.resolve_as_rejected(message=message)
raise TransferAmountLimitError(
transfer_amount_limit=limit.total_amount,
transfer_amount_avail=amount_avail,
limit_time_period_days=limit.time_period_days,
token=self.token.name,
message=message)
return relevant_transfer_limits
def check_sender_has_sufficient_balance(self):
return self.sender_user and self.sender_transfer_account.balance - self.transfer_amount >= 0
def check_sender_is_approved(self):
return self.sender_user and self.sender_transfer_account.is_approved
def check_recipient_is_approved(self):
return self.recipient_user and self.recipient_transfer_account.is_approved
def _select_transfer_account(self, token, user):
if token is None:
raise Exception("Token must be specified")
return find_transfer_accounts_with_matching_token(user, token)
def append_organisation_if_required(self, organisation):
if organisation and organisation not in self.organisations:
self.organisations.append(organisation)
def __init__(self,
amount,
token=None,
sender_user=None,
recipient_user=None,
sender_transfer_account=None,
recipient_transfer_account=None,
transfer_type: TransferTypeEnum = None,
uuid=None,
transfer_metadata=None,
fiat_ramp=None,
transfer_subtype: TransferSubTypeEnum = None,
is_ghost_transfer=False):
if amount < 0:
raise Exception("Negative amount provided")
self.transfer_amount = amount
self.sender_user = sender_user
self.recipient_user = recipient_user
self.sender_transfer_account = sender_transfer_account or self._select_transfer_account(
token, sender_user)
self.token = token or self.sender_transfer_account.token
self.fiat_ramp = fiat_ramp
try:
self.recipient_transfer_account = recipient_transfer_account or self._select_transfer_account(
self.token, recipient_user)
if is_ghost_transfer is False:
self.recipient_transfer_account.is_ghost = False
except NoTransferAccountError:
self.recipient_transfer_account = TransferAccount(
bound_entity=recipient_user,
token=token,
is_approved=True,
is_ghost=is_ghost_transfer)
db.session.add(self.recipient_transfer_account)
if transfer_type is TransferTypeEnum.DEPOSIT:
self.sender_transfer_account = self.recipient_transfer_account.get_float_transfer_account(
)
if transfer_type is TransferTypeEnum.WITHDRAWAL:
self.recipient_transfer_account = self.sender_transfer_account.get_float_transfer_account(
)
if self.sender_transfer_account.token != self.recipient_transfer_account.token:
raise Exception("Tokens do not match")
self.transfer_type = transfer_type
self.transfer_subtype = transfer_subtype
self.transfer_metadata = transfer_metadata
if uuid is not None:
self.uuid = uuid
self.append_organisation_if_required(
self.recipient_transfer_account.organisation)
self.append_organisation_if_required(
self.sender_transfer_account.organisation)
class CreditTransfer(ManyOrgBase, BlockchainTaskableBase):
__tablename__ = 'credit_transfer'
uuid = db.Column(db.String, unique=True)
resolved_date = db.Column(db.DateTime)
_transfer_amount_wei = db.Column(db.Numeric(27), default=0)
transfer_type = db.Column(db.Enum(TransferTypeEnum), index=True)
transfer_subtype = db.Column(db.Enum(TransferSubTypeEnum))
transfer_status = db.Column(db.Enum(TransferStatusEnum),
default=TransferStatusEnum.PENDING)
transfer_mode = db.Column(db.Enum(TransferModeEnum))
transfer_use = db.Column(JSON)
transfer_metadata = db.Column(JSONB)
exclude_from_limit_calcs = db.Column(db.Boolean, default=False)
resolution_message = db.Column(db.String())
token_id = db.Column(db.Integer, db.ForeignKey(Token.id))
sender_transfer_account_id = db.Column(
db.Integer, db.ForeignKey("transfer_account.id"))
recipient_transfer_account_id = db.Column(
db.Integer, db.ForeignKey("transfer_account.id"))
sender_blockchain_address_id = db.Column(
db.Integer, db.ForeignKey("blockchain_address.id"))
recipient_blockchain_address_id = db.Column(
db.Integer, db.ForeignKey("blockchain_address.id"))
sender_user_id = db.Column(db.Integer,
db.ForeignKey("user.id"),
index=True)
recipient_user_id = db.Column(db.Integer, db.ForeignKey("user.id"))
attached_images = db.relationship('UploadedResource',
backref='credit_transfer',
lazy=True)
fiat_ramp = db.relationship('FiatRamp',
backref='credit_transfer',
lazy=True,
uselist=False)
__table_args__ = (Index('updated_index', "updated"), )
from_exchange = db.relationship('Exchange',
backref='from_transfer',
lazy=True,
uselist=False,
foreign_keys='Exchange.from_transfer_id')
to_exchange = db.relationship('Exchange',
backref='to_transfer',
lazy=True,
uselist=False,
foreign_keys='Exchange.to_transfer_id')
# TODO: Apply this to all transfer amounts/balances, work out the correct denominator size
@hybrid_property
def transfer_amount(self):
return (self._transfer_amount_wei or 0) / int(1e16)
@transfer_amount.setter
def transfer_amount(self, val):
self._transfer_amount_wei = val * int(1e16)
def send_blockchain_payload_to_worker(self,
is_retry=False,
queue='high-priority'):
sender_approval = self.sender_transfer_account.get_or_create_system_transfer_approval(
)
recipient_approval = self.recipient_transfer_account.get_or_create_system_transfer_approval(
)
return bt.make_token_transfer(
signing_address=self.sender_transfer_account.organisation.
system_blockchain_address,
token=self.token,
from_address=self.sender_transfer_account.blockchain_address,
to_address=self.recipient_transfer_account.blockchain_address,
amount=self.transfer_amount,
prior_tasks=list(
filter(lambda x: x is not None, [
sender_approval.eth_send_task_uuid,
sender_approval.approval_task_uuid,
recipient_approval.eth_send_task_uuid,
recipient_approval.approval_task_uuid
])),
queue=queue,
task_uuid=self.blockchain_task_uuid)
def resolve_as_completed(self,
existing_blockchain_txn=None,
queue='high-priority'):
if self.transfer_status not in [None, TransferStatusEnum.PENDING]:
raise Exception(
f'Transfer resolve function called multiple times for transaciton {self.id}'
)
self.check_sender_transfer_limits()
self.resolved_date = datetime.datetime.utcnow()
self.transfer_status = TransferStatusEnum.COMPLETE
self.sender_transfer_account.decrement_balance(self.transfer_amount)
self.recipient_transfer_account.increment_balance(self.transfer_amount)
if self.transfer_type == TransferTypeEnum.PAYMENT and self.transfer_subtype == TransferSubTypeEnum.DISBURSEMENT:
if self.recipient_user and self.recipient_user.transfer_card:
self.recipient_user.transfer_card.update_transfer_card()
if self.fiat_ramp and self.transfer_type in [
TransferTypeEnum.DEPOSIT, TransferTypeEnum.WITHDRAWAL
]:
self.fiat_ramp.resolve_as_completed()
if not existing_blockchain_txn:
self.blockchain_task_uuid = str(uuid4())
g.pending_transactions.append((self, queue))
def resolve_as_rejected(self, message=None):
if self.transfer_status not in [None, TransferStatusEnum.PENDING]:
raise Exception(
f'Transfer resolve function called multiple times for transaciton {self.id}'
)
if self.fiat_ramp and self.transfer_type in [
TransferTypeEnum.DEPOSIT, TransferTypeEnum.WITHDRAWAL
]:
self.fiat_ramp.resolve_as_rejected()
self.resolved_date = datetime.datetime.utcnow()
self.transfer_status = TransferStatusEnum.REJECTED
if message:
self.resolution_message = message
def get_transfer_limits(self):
from server.utils.transfer_limits import (
LIMIT_IMPLEMENTATIONS, get_applicable_transfer_limits)
return get_applicable_transfer_limits(LIMIT_IMPLEMENTATIONS, self)
def check_sender_transfer_limits(self):
if self.sender_user is None:
# skip if there is no sender, which implies system send
return
relevant_transfer_limits = self.get_transfer_limits()
for limit in relevant_transfer_limits:
try:
limit.validate_transfer(self)
except (TransferAmountLimitError, TransferCountLimitError,
TransferBalanceFractionLimitError,
MaximumPerTransferLimitError, MinimumSentLimitError,
NoTransferAllowedLimitError) as e:
self.resolve_as_rejected(message=e.message)
raise e
return relevant_transfer_limits
def check_sender_has_sufficient_balance(self):
return self.sender_user and self.sender_transfer_account.balance - self.transfer_amount >= 0
def check_sender_is_approved(self):
return self.sender_user and self.sender_transfer_account.is_approved
def check_recipient_is_approved(self):
return self.recipient_user and self.recipient_transfer_account.is_approved
def _select_transfer_account(self, token, user):
if token is None:
raise Exception("Token must be specified")
return find_transfer_accounts_with_matching_token(user, token)
def append_organisation_if_required(self, organisation):
if organisation and organisation not in self.organisations:
self.organisations.append(organisation)
def __init__(self,
amount,
token=None,
sender_user=None,
recipient_user=None,
sender_transfer_account=None,
recipient_transfer_account=None,
transfer_type: TransferTypeEnum = None,
uuid=None,
transfer_metadata=None,
fiat_ramp=None,
transfer_subtype: TransferSubTypeEnum = None,
transfer_mode: TransferModeEnum = None,
is_ghost_transfer=False):
if amount < 0:
raise Exception("Negative amount provided")
self.transfer_amount = amount
self.sender_user = sender_user
self.recipient_user = recipient_user
self.sender_transfer_account = sender_transfer_account or self._select_transfer_account(
token, sender_user)
self.token = token or self.sender_transfer_account.token
self.fiat_ramp = fiat_ramp
try:
self.recipient_transfer_account = recipient_transfer_account or self._select_transfer_account(
self.token, recipient_user)
if is_ghost_transfer is False:
self.recipient_transfer_account.is_ghost = False
except NoTransferAccountError:
self.recipient_transfer_account = TransferAccount(
bound_entity=recipient_user,
token=token,
is_approved=True,
is_ghost=is_ghost_transfer)
db.session.add(self.recipient_transfer_account)
if transfer_type is TransferTypeEnum.DEPOSIT:
self.sender_transfer_account = self.recipient_transfer_account.get_float_transfer_account(
)
if transfer_type is TransferTypeEnum.WITHDRAWAL:
self.recipient_transfer_account = self.sender_transfer_account.get_float_transfer_account(
)
if self.sender_transfer_account.token != self.recipient_transfer_account.token:
raise Exception("Tokens do not match")
self.transfer_type = transfer_type
self.transfer_subtype = transfer_subtype
self.transfer_mode = transfer_mode
self.transfer_metadata = transfer_metadata
if uuid is not None:
self.uuid = uuid
self.append_organisation_if_required(
self.recipient_transfer_account.organisation)
self.append_organisation_if_required(
self.sender_transfer_account.organisation)
