def process_passive_transfer(transfer, operator_eon_number,
checkpoint_created):
if transfer.wallet == transfer.recipient:
logger.info('Voiding self transfer.')
transfer.close(voided=True)
return
with transfer.lock(auto_renewal=True), transfer.wallet.lock(
auto_renewal=True), transfer.recipient.lock(auto_renewal=True):
wallet_view_context = WalletTransferContext(wallet=transfer.wallet,
transfer=transfer)
recipient_view_context = WalletTransferContext(
wallet=transfer.recipient, transfer=transfer)
if should_void_transfer(transfer, wallet_view_context,
recipient_view_context, operator_eon_number,
checkpoint_created):
logger.info('Voiding transfer.')
transfer.close(voided=True)
return
tx_set_tree = wallet_view_context.optimized_authorized_transfers_tree(
only_appended=True)
tx_set_hash = hex_value(tx_set_tree.root_hash())
highest_spendings, highest_gains = wallet_view_context.off_chain_actively_sent_received_amounts(
eon_number=transfer.eon_number, only_appended=True)
active_state = ActiveState(
wallet=transfer.wallet,
updated_spendings=transfer.sender_active_state.updated_spendings,
updated_gains=highest_gains,
tx_set_hash=tx_set_hash,
eon_number=transfer.eon_number)
raw_checksum = active_state.checksum()
encoded_checksum = hex_value(raw_checksum)
wallet_active_state = transfer.sender_active_state
if wallet_active_state.wallet_signature.checksum != encoded_checksum:
logger.error(
'Transfer {} invalid sender active state checksum for {}'.
format(transfer.id, transfer.wallet.address))
transfer.close(voided=True)
return
try:
wallet_active_state.operator_signature = wallet_active_state.sign_active_state(
settings.HUB_OWNER_ACCOUNT_ADDRESS,
settings.HUB_OWNER_ACCOUNT_KEY)
except LookupError as e:
logger.error(e)
return
transfer.sender_active_state.save()
transfer.close(complete=True, appended=True)
operator_celery.send_task('auditor.tasks.on_transfer_confirmation',
args=[transfer.id])
logger.info('Passive transfer {} processed.'.format(transfer.id))
def test_checkpoint_creation(self):
self.eth_token = Token.objects.first()
lqd_token_address = deploy_new_test_token(test_case=self)
distribute_token_balance_to_addresses(
test_case=self,
token_address=lqd_token_address,
recipients=testrpc_accounts.accounts)
self.lqd_token = register_token(token_address=lqd_token_address,
name='Liquidity',
short_name='LQD',
register_on_chain=True)
send_queued_transactions()
self.tokens = [self.eth_token, self.lqd_token]
TokenPair.objects.create(token_from=self.eth_token,
token_to=self.lqd_token)
TokenPair.objects.create(token_from=self.lqd_token,
token_to=self.eth_token)
self.registered_accounts = {
self.eth_token: register_testrpc_accounts(self,
token=self.eth_token),
self.lqd_token: register_testrpc_accounts(self,
token=self.lqd_token)
}
for token in self.tokens:
self.assertEqual(
self.contract_interface.get_unmanaged_funds(token.address, 1),
0)
self.assertEqual(
self.contract_interface.get_managed_funds(token.address, 1), 0)
for token in self.tokens:
create_deposits(self, testrpc_accounts.accounts, token)
for token in self.tokens:
self.assertEqual(
self.contract_interface.get_unmanaged_funds(token.address, 1),
self.contract_interface.get_total_balance(token.address))
self.assertEqual(
self.contract_interface.get_managed_funds(token.address, 1), 0)
for account in testrpc_accounts.accounts[1:5]:
eth_wallet = Wallet.objects.get(address=remove_0x_prefix(
account.get('address')),
token=self.eth_token)
lqd_wallet = Wallet.objects.get(address=remove_0x_prefix(
account.get('address')),
token=self.lqd_token)
eth_wallet_context = WalletTransferContext(wallet=eth_wallet,
transfer=None)
lqd_wallet_context = WalletTransferContext(wallet=lqd_wallet,
transfer=None)
account[
'reduced_eth_balance'] = eth_wallet_context.available_funds_at_eon(
eon_number=1, only_appended=False) - 1
account[
'reduced_lqd_balance'] = lqd_wallet_context.available_funds_at_eon(
eon_number=1, only_appended=False)
send_swap( # Buy LQD at 0.5 ETH
test_case=self,
eon_number=1,
account=account,
token=self.eth_token,
token_swapped=self.lqd_token,
amount=1,
amount_swapped=2,
nonce=random.randint(1, 999999))
for account in testrpc_accounts.accounts[5:9]:
eth_wallet = Wallet.objects.get(address=remove_0x_prefix(
account.get('address')),
token=self.eth_token)
lqd_wallet = Wallet.objects.get(address=remove_0x_prefix(
account.get('address')),
token=self.lqd_token)
eth_wallet_context = WalletTransferContext(wallet=eth_wallet,
transfer=None)
lqd_wallet_context = WalletTransferContext(wallet=lqd_wallet,
transfer=None)
account[
'reduced_eth_balance'] = eth_wallet_context.available_funds_at_eon(
eon_number=1, only_appended=False)
account[
'reduced_lqd_balance'] = lqd_wallet_context.available_funds_at_eon(
eon_number=1, only_appended=False) - 2
send_swap( # Sell LQD at 0.5 ETH
test_case=self,
eon_number=1,
account=account,
token=self.lqd_token,
token_swapped=self.eth_token,
amount=2,
amount_swapped=1,
nonce=random.randint(1, 999999))
confirm_swaps_for_eon(operator_eon_number=1)
cancel_finalize_swaps_for_eon(operator_eon_number=1)
process_swaps_for_eon(operator_eon_number=1)
for account in testrpc_accounts.accounts[1:5]:
finalize_last_swap(test_case=self,
token=self.eth_token,
token_swapped=self.lqd_token,
account=account)
for account in testrpc_accounts.accounts[5:9]:
finalize_last_swap(test_case=self,
token=self.lqd_token,
token_swapped=self.eth_token,
account=account)
confirm_swaps_for_eon(operator_eon_number=1)
cancel_finalize_swaps_for_eon(operator_eon_number=1)
process_swaps_for_eon(operator_eon_number=1)
buyers_sellers = [
testrpc_accounts.accounts[1:5], testrpc_accounts.accounts[5:9]
]
for i in range(0, 2):
for account in buyers_sellers[i]:
eth_wallet = Wallet.objects.get(address=remove_0x_prefix(
account.get('address')),
token=self.eth_token)
lqd_wallet = Wallet.objects.get(address=remove_0x_prefix(
account.get('address')),
token=self.lqd_token)
eth_wallet_context = WalletTransferContext(wallet=eth_wallet,
transfer=None)
lqd_wallet_context = WalletTransferContext(wallet=lqd_wallet,
transfer=None)
eth_out, eth_in = eth_wallet_context.off_chain_actively_sent_received_amounts(
eon_number=1, only_appended=False)
lqd_out, lqd_in = lqd_wallet_context.off_chain_actively_sent_received_amounts(
eon_number=1, only_appended=False)
eth_out -= account['reduced_eth_balance']
lqd_out -= account['reduced_lqd_balance']
if i == 0: # LQD buyers
assert eth_out == 1 and eth_in == 0, '{}/{}'.format(
eth_out, eth_in)
assert lqd_out - 2 == 0 and lqd_in - 2 == 2, '{}/{}'.format(
lqd_out, lqd_in)
else: # LQD sellers
assert lqd_out == 2 and lqd_in == 0, '{}/{}'.format(
lqd_out, lqd_in)
assert eth_out - 1 == 0 and eth_in - 1 == 1, '{}/{}'.format(
eth_out, eth_in)
# Verify transfers were complete
swaps = Transfer.objects.filter(swap=True)
for transfer in swaps:
self.assertTrue(transfer.is_fulfilled_swap())
commit_eon(test_case=self, eon_number=1)
advance_to_next_eon(test_case=self, eon_number=1)
commit_eon(test_case=self, eon_number=2)
def should_void_swap(swap: Transfer,
wallet_view_context: WalletTransferContext,
recipient_view_context: WalletTransferContext,
operator_eon_number: int, is_checkpoint_created: bool):
if not settings.SWAPS_ENABLED:
logger.error('Swaps disabled. Voiding {}'.format(swap.id))
return True
if swap.amount < 1:
logger.error('Swap {} has less than 1 amount'.format(swap.id))
return True
if swap.amount_swapped < 1:
logger.error('Swap {} has less than 1 amount swapped'.format(swap.id))
return True
# Unauthorized transfer
if swap.sender_active_state is None:
logger.error('Swap {} no authorization'.format(swap.id))
return True
# Invalid signature by sender
if not swap.sender_active_state.wallet_signature.is_valid():
logger.error('Swap {} invalid sender signature.'.format(swap.id))
return True
# Unreceived transaction
if swap.recipient_active_state is None:
logger.error('Swap receipt for {} not provided.'.format(swap.id))
return True
# Invalid signature by recipient
if not swap.recipient_active_state.wallet_signature.is_valid():
logger.error('Swap {} invalid receipt signature.'.format(swap.id))
return True
# Ensure log consistency
can_append_to_sender_log = wallet_view_context.can_append_transfer()
if can_append_to_sender_log is not True:
logger.error('Sender: {}'.format(can_append_to_sender_log))
return True
can_append_to_recipient_log = recipient_view_context.can_append_transfer()
if can_append_to_recipient_log is not True:
logger.error('Recipient: {}'.format(can_append_to_recipient_log))
return True
# Skip consistency checks since they were done at least once before.
if swap.appended:
return False
# Overspending
sender_funds_remaining = wallet_view_context.loosely_available_funds_at_eon(
eon_number=swap.eon_number,
current_eon_number=operator_eon_number,
is_checkpoint_created=is_checkpoint_created,
only_appended=True)
# sender remaining funds should be more than remaining amount in order
matched_out, matched_in = swap.matched_amounts(all_eons=True)
if sender_funds_remaining < swap.amount - matched_out:
logger.error('Swap {} overspending.'.format(swap.id))
return True
# Prevent future overdrawing
# if swap.sender_balance_marker.amount > sender_funds_remaining - swap.amount:
if swap.sender_balance_marker.amount != 0:
logger.error('Swap {} invalid concise marker balance.'.format(swap.id))
return True
concise_balance_marker = MinimumAvailableBalanceMarker(
wallet=swap.wallet,
eon_number=swap.eon_number,
amount=swap.sender_balance_marker.amount)
concise_balance_marker_checksum = crypto.hex_value(
concise_balance_marker.checksum())
if swap.sender_balance_marker.signature.checksum != concise_balance_marker_checksum:
logger.error('Swap {} invalid concise marker checksum for {}.'.format(
swap.id, swap.sender_balance_marker.amount))
return True
highest_spendings, highest_gains = wallet_view_context.off_chain_actively_sent_received_amounts(
eon_number=swap.eon_number, only_appended=True)
# if this is a multi eon swap
if Transfer.objects.filter(eon_number=swap.eon_number - 1,
tx_id=swap.tx_id).exists():
# set balances to initial fixed balances stored in transfer eon state
sender_starting_balance = swap.sender_starting_balance
recipient_starting_balance = swap.recipient_starting_balance
# make sure this eon's starting balance is exactly the initial stored balance
# when matched amount is taken into consideration for both sender and receiver
if wallet_view_context.starting_balance_in_eon(
swap.eon_number) != sender_starting_balance - matched_out:
logger.error(
'Swap {} invalid sender starting balance of future state {} != {} - {}.'
.format(
swap.id,
wallet_view_context.starting_balance_in_eon(
swap.eon_number), sender_starting_balance,
matched_out))
if recipient_view_context.starting_balance_in_eon(
swap.eon_number) != recipient_starting_balance + matched_in:
logger.error(
'Swap {} invalid recipient starting balance of future state {} != {} + {}.'
.format(
swap.id,
recipient_view_context.starting_balance_in_eon(
swap.eon_number), recipient_starting_balance,
matched_out))
assert (wallet_view_context.starting_balance_in_eon(
swap.eon_number) == sender_starting_balance - matched_out)
assert (recipient_view_context.starting_balance_in_eon(
swap.eon_number) == recipient_starting_balance + matched_in)
else:
sender_starting_balance = int(
wallet_view_context.starting_balance_in_eon(swap.eon_number))
recipient_starting_balance = int(
recipient_view_context.starting_balance_in_eon(swap.eon_number))
# Debit Authorization
tx_set_tree = wallet_view_context.optimized_authorized_transfers_tree(
only_appended=True, starting_balance=sender_starting_balance)
tx_set_hash = crypto.hex_value(tx_set_tree.root_hash())
transfer_index = tx_set_tree.merkle_tree_nonce_map.get(swap.nonce)
transfer_proof = tx_set_tree.proof(transfer_index)
highest_spendings, highest_gains = wallet_view_context.off_chain_actively_sent_received_amounts(
eon_number=swap.eon_number, only_appended=True)
debiting_active_state = ActiveState(wallet=swap.wallet,
updated_spendings=highest_spendings +
swap.amount,
updated_gains=highest_gains,
tx_set_hash=tx_set_hash,
tx_set_proof_hashes=transfer_proof,
tx_set_index=transfer_index,
eon_number=swap.eon_number)
debiting_active_state_checksum = crypto.hex_value(
debiting_active_state.checksum())
if swap.sender_active_state.wallet_signature.checksum != debiting_active_state_checksum:
logger.error('Swap {} invalid debit active state checksum.'.format(
swap.id))
return True
# Credit Authorization
tx_set_tree = recipient_view_context.optimized_authorized_transfers_tree(
only_appended=True, starting_balance=recipient_starting_balance)
tx_set_hash = crypto.hex_value(tx_set_tree.root_hash())
transfer_index = tx_set_tree.merkle_tree_nonce_map.get(swap.nonce)
transfer_proof = tx_set_tree.proof(transfer_index)
highest_spendings, highest_gains = recipient_view_context.off_chain_actively_sent_received_amounts(
eon_number=swap.eon_number, only_appended=True)
crediting_active_state = ActiveState(wallet=swap.recipient,
updated_spendings=highest_spendings,
updated_gains=highest_gains,
tx_set_hash=tx_set_hash,
tx_set_proof_hashes=transfer_proof,
tx_set_index=transfer_index,
eon_number=swap.eon_number)
crediting_active_state_checksum = crypto.hex_value(
crediting_active_state.checksum())
if swap.recipient_active_state.wallet_signature.checksum != crediting_active_state_checksum:
logger.error('Swap {} invalid credit active state checksum.'.format(
swap.id))
return True
# Finality Authorization
swap.complete = True
tx_set_tree = recipient_view_context.optimized_authorized_transfers_tree(
only_appended=True, starting_balance=recipient_starting_balance)
swap.complete = False
tx_set_hash = crypto.hex_value(tx_set_tree.root_hash())
transfer_index = tx_set_tree.merkle_tree_nonce_map.get(swap.nonce)
transfer_proof = tx_set_tree.proof(transfer_index)
recipient_fulfillment_active_state = ActiveState(
wallet=swap.recipient,
updated_spendings=highest_spendings,
updated_gains=highest_gains + swap.amount_swapped,
tx_set_hash=tx_set_hash,
tx_set_proof_hashes=transfer_proof,
tx_set_index=transfer_index,
eon_number=swap.eon_number)
recipient_fulfillment_active_state_checksum = crypto.hex_value(
recipient_fulfillment_active_state.checksum())
if swap.recipient_fulfillment_active_state.wallet_signature.checksum != recipient_fulfillment_active_state_checksum:
logger.error(
'Swap {} invalid finalization active state checksum.'.format(
swap.id))
return True
return False
def create(self, validated_data):
active_state_signature_data = validated_data.pop('debit_signature')
wallet = validated_data.pop('wallet')
recipient = validated_data.pop('recipient')
# get current eon
current_eon = LocalViewInterface.latest().eon_number()
# transfer eon should be the current eon number
if validated_data.pop('eon_number') != current_eon:
raise serializers.ValidationError(
detail='', code=ErrorCode.EON_NUMBER_OUT_OF_SYNC)
# TODO refactor this such that the recipient is only locked after the sender's details are verified
wallets = sorted([wallet, recipient], key=lambda w: w.trail_identifier)
with RootCommitment.read_write_lock(
suffix=current_eon, auto_renewal=False), wallets[0].lock(
auto_renewal=False), wallets[1].lock(auto_renewal=False):
if RootCommitment.objects.filter(eon_number=current_eon +
1).exists():
raise serializers.ValidationError(
detail='', code=ErrorCode.EON_NUMBER_OUT_OF_SYNC)
transfer = Transfer(wallet=wallet,
amount=validated_data.pop('amount'),
eon_number=current_eon,
recipient=recipient,
nonce=validated_data.pop('nonce'),
passive=True)
wallet_view_context = WalletTransferContext(wallet=wallet,
transfer=transfer)
recipient_view_context = WalletTransferContext(wallet=recipient,
transfer=transfer)
# Minimal SLA
if not wallet.is_sla_exempt() and not recipient.is_sla_exempt():
if not wallet.has_valid_sla():
sender_transfers_list = wallet_view_context.authorized_transfers_list(
only_appended=False, force_append=True)
if len(sender_transfers_list) > settings.SLA_THRESHOLD:
raise serializers.ValidationError(
detail='',
code=ErrorCode.DEBIT_WALLET_EXCEEDED_SLA)
elif not recipient.has_valid_sla():
recipient_transfers_list = recipient_view_context.authorized_transfers_list(
only_appended=False, force_append=True)
if len(recipient_transfers_list) > settings.SLA_THRESHOLD:
raise serializers.ValidationError(
detail='',
code=ErrorCode.CREDIT_WALLET_EXCEEDED_SLA)
# Ensure sender log consistency
can_append_to_sender_log = wallet_view_context.can_schedule_transfer(
)
if can_append_to_sender_log is not True:
raise serializers.ValidationError(
detail='Sender: {}'.format(can_append_to_sender_log),
code=ErrorCode.DEBIT_WALLET_CANNOT_ADD_TRANSACTION)
# Ensure recipient log consistency
can_append_to_recipient_log = recipient_view_context.can_schedule_transfer(
)
if can_append_to_recipient_log is not True:
raise serializers.ValidationError(
detail='Recipient: {}'.format(can_append_to_recipient_log),
code=ErrorCode.CREDIT_WALLET_CANNOT_ADD_TRANSACTION)
# Ensure transfer consistency
can_spend, currently_available_funds = wallet_view_context.can_send_transfer(
current_eon_number=current_eon,
using_only_appended_funds=False)
if can_spend is not True:
raise serializers.ValidationError(
detail=can_spend, code=ErrorCode.DEBIT_WALLET_OVERSPENDING)
# Validate data
concise_balance_marker_signature_data = validated_data.pop(
'debit_balance_signature')
concise_balance_marker_amount = validated_data.pop('debit_balance')
if concise_balance_marker_amount > currently_available_funds - transfer.amount:
raise serializers.ValidationError(
detail='',
code=ErrorCode.DEBIT_WALLET_BALANCE_MARKER_EXCEED_BALANCE)
concise_balance_marker = MinimumAvailableBalanceMarker(
wallet=wallet,
eon_number=transfer.eon_number,
amount=concise_balance_marker_amount)
concise_balance_marker_checksum = hex_value(
concise_balance_marker.checksum())
concise_balance_marker_signature = Signature(
wallet=transfer.wallet,
checksum=concise_balance_marker_checksum,
value=concise_balance_marker_signature_data.get('value'))
if not concise_balance_marker_signature.is_valid():
raise serializers.ValidationError(
detail='', code=ErrorCode.INVALID_DEBIT_BALANCE_SIGNATURE)
tx_set_tree = wallet_view_context.optimized_authorized_transfers_tree(
)
tx_set_hash = hex_value(tx_set_tree.root_hash())
transfer_index = tx_set_tree.merkle_tree_nonce_map.get(
transfer.nonce)
transfer_proof = tx_set_tree.proof(transfer_index)
highest_spendings, highest_gains = wallet_view_context.off_chain_actively_sent_received_amounts(
eon_number=transfer.eon_number, only_appended=False)
active_state = ActiveState(wallet=wallet,
updated_spendings=highest_spendings +
transfer.amount,
updated_gains=highest_gains,
tx_set_hash=tx_set_hash,
tx_set_proof_hashes=transfer_proof,
tx_set_index=transfer_index,
eon_number=transfer.eon_number)
checksum = hex_value(active_state.checksum())
active_state_signature = Signature(
wallet=transfer.wallet,
checksum=checksum,
value=active_state_signature_data.get('value'))
if not active_state_signature.is_valid():
raise serializers.ValidationError(
detail='', code=ErrorCode.INVALID_DEBIT_SIGNATURE)
transfer.position = recipient_view_context.off_chain_passively_received_amount(
eon_number=transfer.eon_number, only_appended=False)
# locking context covers saving the state as well to make sure checkpoint creation is consistent
with transaction.atomic():
Signature.objects.bulk_create(
[concise_balance_marker_signature, active_state_signature])
concise_balance_marker.signature = concise_balance_marker_signature
concise_balance_marker.save()
active_state.wallet_signature = active_state_signature
active_state.operator_signature = active_state.sign_active_state(
settings.HUB_OWNER_ACCOUNT_ADDRESS,
settings.HUB_OWNER_ACCOUNT_KEY)
active_state.save()
transfer.sender_active_state = active_state
transfer.sender_balance_marker = concise_balance_marker
# cache transfer index in sender active set
transfer.sender_merkle_index = transfer_index
# transfer.sender_merkle_root_cache = tx_set_hash
# cache active set merkle mountains height array and hash array for recipient active set
transfer.sender_merkle_hash_cache, transfer.sender_merkle_height_cache = tx_set_tree.merkle_cache_stacks(
)
transfer.complete = True
transfer.appended = True
transfer.processed = True
transfer.save()
if transfer.appended:
operator_celery.send_task('auditor.tasks.on_transfer_confirmation',
args=[transfer.id])
return transfer
def finalize_swap(test_case: RPCTestCase,
swap: Transfer,
account,
expected_status=status.HTTP_200_OK,
eon_count=1):
print('FINALIZING {} ({}/{})'.format(swap.id, int(swap.amount),
int(swap.amount_swapped)))
finalization_authorizations = []
test_case.assertTrue(swap.complete)
recipient_view_context = WalletTransferContext(wallet=swap.recipient,
transfer=swap)
tx_set_tree = recipient_view_context.authorized_transfers_tree(
only_appended=False, force_append=True)
tx_set_hash = crypto.hex_value(tx_set_tree.root_hash())
transfer_index = tx_set_tree.merkle_tree_nonce_map.get(swap.nonce)
transfer_proof = tx_set_tree.proof(transfer_index)
highest_spendings, highest_gains = recipient_view_context.off_chain_actively_sent_received_amounts(
eon_number=swap.eon_number, only_appended=False)
print("Finalize spent {} gained {}".format(highest_spendings,
highest_gains))
for state in ActiveState.objects.filter(wallet=swap.recipient,
eon_number=swap.eon_number):
print(state.id)
print("Finalize spent {} gained {}".format(state.updated_spendings,
state.updated_gains))
finalization_active_state = ActiveState(
wallet=swap.recipient,
updated_spendings=highest_spendings + swap.amount_swapped,
updated_gains=highest_gains + swap.amount_swapped,
tx_set_hash=tx_set_hash,
tx_set_proof_hashes=transfer_proof,
tx_set_index=transfer_index,
eon_number=swap.eon_number)
finalization_authorizations.append({
'value':
encode_signature(
sign_message(finalization_active_state.checksum(),
account.get('pk')))
})
for i in range(1, eon_count):
future_spent_gained = max(highest_spendings,
highest_gains) + swap.amount_swapped + 1
empty_tx_set_hash = crypto.hex_value(NODE_CACHE[0]['hash'])
finalization_active_state = ActiveState(
wallet=swap.recipient,
updated_spendings=future_spent_gained,
updated_gains=future_spent_gained,
tx_set_hash=empty_tx_set_hash,
# any dummy value
tx_set_proof_hashes='',
# any dummy value
tx_set_index=0,
eon_number=swap.eon_number + i)
finalization_authorizations.append({
'value':
encode_signature(
sign_message(finalization_active_state.checksum(),
account.get('pk')))
})
# Make API Request
url = reverse('finalize-swap-endpoint', kwargs={'pk': swap.id})
data = {'finalization_signature': finalization_authorizations}
# Send tx to server
x = datetime.now()
response = test_case.client.put(url, data, format='json')
y = datetime.now()
delta = y - x
# Ensure the transaction was recorded
test_case.assertEqual(response.status_code, expected_status,
response.content)
print('FINALIZE Time: {}s'.format(delta))
# Log time delta
return delta
def cancel_swap(test_case: RPCTestCase,
swap: Transfer,
account,
expected_status=status.HTTP_200_OK,
eon_count=1):
sender_cancellation_authorizations = []
recipient_cancellation_authorizations = []
sender_view_context = WalletTransferContext(wallet=swap.wallet,
transfer=swap)
tx_set_tree = sender_view_context.authorized_transfers_tree(
only_appended=False,
force_append=False,
assume_active_state_exists=True)
tx_set_hash = crypto.hex_value(tx_set_tree.root_hash())
transfer_index = tx_set_tree.merkle_tree_nonce_map.get(swap.nonce)
transfer_proof = tx_set_tree.proof(transfer_index)
sender_highest_spendings, sender_highest_gains = sender_view_context.off_chain_actively_sent_received_amounts(
eon_number=swap.eon_number, only_appended=False)
matched_out, _ = swap.matched_amounts()
sender_highest_gains += swap.amount - matched_out
sender_cancellation_active_state = ActiveState(
wallet=swap.wallet,
updated_spendings=sender_highest_spendings,
updated_gains=sender_highest_gains,
tx_set_hash=tx_set_hash,
tx_set_proof_hashes=transfer_proof,
tx_set_index=transfer_index,
eon_number=swap.eon_number)
recipient_view_context = WalletTransferContext(wallet=swap.recipient,
transfer=swap)
tx_set_tree = recipient_view_context.authorized_transfers_tree(
only_appended=False,
force_append=False,
assume_active_state_exists=True)
tx_set_hash = crypto.hex_value(tx_set_tree.root_hash())
transfer_index = tx_set_tree.merkle_tree_nonce_map.get(swap.nonce)
transfer_proof = tx_set_tree.proof(transfer_index)
recipient_highest_spendings, recipient_highest_gains = recipient_view_context.off_chain_actively_sent_received_amounts(
eon_number=swap.eon_number, only_appended=False)
recipient_cancellation_active_state = ActiveState(
wallet=swap.recipient,
updated_spendings=recipient_highest_spendings + swap.amount_swapped,
updated_gains=recipient_highest_gains + swap.amount_swapped,
tx_set_hash=tx_set_hash,
tx_set_proof_hashes=transfer_proof,
tx_set_index=transfer_index,
eon_number=swap.eon_number)
sender_cancellation_authorizations.append({
'value':
encode_signature(
sign_message(sender_cancellation_active_state.checksum(),
account.get('pk')))
})
recipient_cancellation_authorizations.append({
'value':
encode_signature(
sign_message(recipient_cancellation_active_state.checksum(),
account.get('pk')))
})
for i in range(1, eon_count):
empty_tx_set_hash = crypto.hex_value(NODE_CACHE[0]['hash'])
sender_future_spent_gained = max(sender_highest_spendings,
sender_highest_gains) + 1
recipient_future_spent_gained = max(
recipient_highest_spendings,
recipient_highest_gains) + swap.amount_swapped + 1
sender_cancellation_active_state = ActiveState(
wallet=swap.wallet,
updated_spendings=sender_future_spent_gained,
updated_gains=sender_future_spent_gained,
tx_set_hash=empty_tx_set_hash,
# any dummy value
tx_set_proof_hashes='',
# any dummy value
tx_set_index=0,
eon_number=swap.eon_number + i)
recipient_cancellation_active_state = ActiveState(
wallet=swap.recipient,
updated_spendings=recipient_future_spent_gained,
updated_gains=recipient_future_spent_gained,
tx_set_hash=empty_tx_set_hash,
# any dummy value
tx_set_proof_hashes='',
# any dummy value
tx_set_index=0,
eon_number=swap.eon_number + i)
sender_cancellation_authorizations.append({
'value':
encode_signature(
sign_message(sender_cancellation_active_state.checksum(),
account.get('pk')))
})
recipient_cancellation_authorizations.append({
'value':
encode_signature(
sign_message(recipient_cancellation_active_state.checksum(),
account.get('pk')))
})
# Make API Request
url = reverse('cancel-swap-endpoint', kwargs={'pk': swap.id})
data = {
'sender_cancellation_signature': sender_cancellation_authorizations,
'recipient_cancellation_signature':
recipient_cancellation_authorizations
}
# Send tx to server
x = datetime.now()
response = test_case.client.put(url, data, format='json')
y = datetime.now()
delta = y - x
# Ensure the transaction was recorded
test_case.assertEqual(response.status_code, expected_status,
response.content)
print('CANCEL Time: {}s'.format(delta))
# Log time delta
return delta
def send_swap(test_case: RPCTestCase,
eon_number,
account,
token,
token_swapped,
amount,
amount_swapped,
nonce,
expected_status=status.HTTP_201_CREATED,
eon_count=1,
sell_order=True):
# Sender account
sender_wallet = Wallet.objects.get(address=remove_0x_prefix(
account.get('address')),
token=token)
# Recipient account
recipient_wallet = Wallet.objects.get(address=remove_0x_prefix(
account.get('address')),
token=token_swapped)
sender_wallet_context = WalletTransferContext(wallet=sender_wallet,
transfer=None)
recipient_wallet_context = WalletTransferContext(wallet=recipient_wallet,
transfer=None)
initial_sender_balance = sender_wallet_context.available_funds_at_eon(
eon_number=eon_number, only_appended=False)
initial_recipient_balance = recipient_wallet_context.available_funds_at_eon(
eon_number=eon_number, only_appended=False)
if initial_sender_balance < amount:
send_transaction(test_case=test_case,
eon_number=eon_number,
sender=testrpc_accounts.accounts[0],
recipient=account,
amount=amount - initial_sender_balance,
nonce=random.randint(1, 999999),
token=token)
if initial_sender_balance > amount:
# clear sender account
send_transaction(test_case=test_case,
eon_number=eon_number,
sender=account,
recipient=testrpc_accounts.accounts[0],
amount=initial_sender_balance - amount,
nonce=random.randint(1, 999999),
token=token)
if initial_recipient_balance > 0:
# clear recipient account
send_transaction(test_case=test_case,
eon_number=eon_number,
sender=account,
recipient=testrpc_accounts.accounts[0],
amount=initial_recipient_balance,
nonce=random.randint(1, 999999),
token=token_swapped)
sender_balance = sender_wallet_context.available_funds_at_eon(
eon_number=eon_number, only_appended=False)
recipient_balance = recipient_wallet_context.available_funds_at_eon(
eon_number=eon_number, only_appended=False)
test_case.assertEqual(sender_balance, amount)
test_case.assertEqual(recipient_balance, 0)
debit_balance_signatures = []
debit_signatures = []
credit_balance_signatures = []
credit_signatures = []
fulfillment_signatures = []
for i in range(eon_count):
swap = Transfer(wallet=sender_wallet,
amount=amount,
eon_number=eon_number + i,
recipient=recipient_wallet,
amount_swapped=amount_swapped,
nonce=nonce,
processed=False,
complete=False,
swap=True)
sender_wallet_context = WalletTransferContext(wallet=sender_wallet,
transfer=swap)
recipient_wallet_context = WalletTransferContext(
wallet=recipient_wallet, transfer=swap)
sender_highest_spent, sender_highest_gained = sender_wallet_context.off_chain_actively_sent_received_amounts(
eon_number=eon_number + i, only_appended=False)
if i == 0:
tx_set_tree = sender_wallet_context.authorized_transfers_tree(
only_appended=False, force_append=True)
else:
tx_set_tree = WalletTransferContext.authorized_transfers_tree_from_list(
[
swap.shorthand(sender_wallet_context,
is_last_transfer=True,
starting_balance=sender_balance)
])
tx_set_hash = hex_value(tx_set_tree.root_hash())
debiting_active_state = ActiveState(
wallet=sender_wallet,
updated_spendings=sender_highest_spent + amount,
updated_gains=sender_highest_gained,
eon_number=eon_number + i,
tx_set_hash=tx_set_hash)
debiting_active_state_authorization = sign_message(
debiting_active_state.checksum(), account.get('pk'))
debiting_active_state_signature = Signature(
wallet=sender_wallet,
checksum=hex_value(debiting_active_state.checksum()),
value=encode_signature(debiting_active_state_authorization))
test_case.assertTrue(debiting_active_state_signature.is_valid())
debit_concise_balance_marker = MinimumAvailableBalanceMarker(
wallet=sender_wallet, eon_number=eon_number + i, amount=0)
debit_concise_balance_marker_authorization = sign_message(
debit_concise_balance_marker.checksum(), account.get('pk'))
debit_concise_balance_marker_signature = Signature(
wallet=sender_wallet,
checksum=hex_value(debit_concise_balance_marker.checksum()),
value=encode_signature(debit_concise_balance_marker_authorization))
test_case.assertTrue(debit_concise_balance_marker_signature.is_valid())
recipient_highest_spent, recipient_highest_gained = recipient_wallet_context.off_chain_actively_sent_received_amounts(
eon_number=eon_number + i, only_appended=False)
if i == 0:
tx_set_tree = recipient_wallet_context.authorized_transfers_tree(
only_appended=False, force_append=True)
else:
tx_set_tree = WalletTransferContext.authorized_transfers_tree_from_list(
[
swap.shorthand(recipient_wallet_context,
is_last_transfer=True,
starting_balance=recipient_balance)
])
tx_set_hash = hex_value(tx_set_tree.root_hash())
crediting_active_state = ActiveState(
wallet=recipient_wallet,
updated_spendings=recipient_highest_spent,
updated_gains=recipient_highest_gained,
eon_number=eon_number + i,
tx_set_hash=tx_set_hash)
crediting_active_state_authorization = sign_message(
crediting_active_state.checksum(), account.get('pk'))
crediting_active_state_signature = Signature(
wallet=recipient_wallet,
checksum=hex_value(crediting_active_state.checksum()),
value=encode_signature(crediting_active_state_authorization))
test_case.assertTrue(crediting_active_state_signature.is_valid())
credit_concise_balance_marker = MinimumAvailableBalanceMarker(
wallet=recipient_wallet, eon_number=eon_number + i, amount=0)
credit_concise_balance_marker_authorization = sign_message(
credit_concise_balance_marker.checksum(), account.get('pk'))
credit_concise_balance_marker_signature = Signature(
wallet=recipient_wallet,
checksum=hex_value(credit_concise_balance_marker.checksum()),
value=encode_signature(
credit_concise_balance_marker_authorization))
test_case.assertTrue(
credit_concise_balance_marker_signature.is_valid())
swap.processed, swap.complete = True, True
if i == 0:
tx_set_tree = recipient_wallet_context.authorized_transfers_tree(
only_appended=False, force_append=True)
else:
tx_set_tree = WalletTransferContext.authorized_transfers_tree_from_list(
[
swap.shorthand(recipient_wallet_context,
is_last_transfer=True,
starting_balance=0)
])
tx_set_hash = hex_value(tx_set_tree.root_hash())
recipient_fulfillment_active_state = ActiveState(
wallet=recipient_wallet,
updated_spendings=recipient_highest_spent,
updated_gains=recipient_highest_gained + amount_swapped,
eon_number=eon_number + i,
tx_set_hash=tx_set_hash)
recipient_fulfillment_active_state_authorization = sign_message(
recipient_fulfillment_active_state.checksum(), account.get('pk'))
swap.processed, swap.complete = False, False
recipient_fulfillment_active_state_signature = Signature(
wallet=recipient_wallet,
checksum=hex_value(recipient_fulfillment_active_state.checksum()),
value=encode_signature(
recipient_fulfillment_active_state_authorization))
test_case.assertTrue(
recipient_fulfillment_active_state_signature.is_valid())
debit_balance_signatures.append({
'value':
encode_signature(debit_concise_balance_marker_authorization)
})
debit_signatures.append(
{'value': encode_signature(debiting_active_state_authorization)})
credit_balance_signatures.append({
'value':
encode_signature(credit_concise_balance_marker_authorization)
})
credit_signatures.append(
{'value': encode_signature(crediting_active_state_authorization)})
fulfillment_signatures.append({
'value':
encode_signature(recipient_fulfillment_active_state_authorization)
})
# Make API Request
url = reverse('swap-endpoint')
data = {
'debit_signature': debit_signatures,
'debit_balance_signature': debit_balance_signatures,
'credit_signature': credit_signatures,
'credit_balance_signature': credit_balance_signatures,
'credit_fulfillment_signature': fulfillment_signatures,
'eon_number': eon_number,
'amount': amount,
'amount_swapped': amount_swapped,
'nonce': nonce,
'wallet': {
'address': sender_wallet.address,
'token': sender_wallet.token.address,
},
'recipient': {
'address': recipient_wallet.address,
'token': recipient_wallet.token.address,
},
'sell_order': sell_order
}
# Send tx to server
x = datetime.now()
response = test_case.client.post(url, data, format='json')
y = datetime.now()
delta = y - x
# Ensure the transaction was recorded
test_case.assertEqual(response.status_code, expected_status,
response.content)
print('SWAP Time: {}s for {}/{}'.format(delta, amount, amount_swapped))
# assert that swap created for current eon is confirmed
tx = json.loads(response.content)
swap = Transfer.objects.get(id=tx['id'])
test_case.assertEqual(swap.eon_number, eon_number)
test_case.assertTrue(swap.is_signed_by_operator())
# Log time delta
return delta
def create(self, validated_data):
wallet = validated_data.pop('wallet')
recipient = validated_data.pop('recipient')
if not TokenPair.objects.filter(token_from=wallet.token,
token_to=recipient.token).exists():
raise serializers.ValidationError(
detail='', code=ErrorCode.TOKEN_PAIR_BLOCKED)
# swap data
valid_eons = validated_data.pop('valid_eons')
swap_amount = validated_data.pop('amount')
swap_nonce = validated_data.pop('nonce')
sell_order = validated_data.pop('sell_order', True)
swap_amount_swapped = validated_data.pop('amount_swapped')
debit_signatures = validated_data.pop('debit_signature')
debit_balance_signatures = validated_data.pop(
'debit_balance_signature')
credit_balance_signatures = validated_data.pop(
'credit_balance_signature')
credit_signatures = validated_data.pop('credit_signature')
recipient_fulfillment_signatures = validated_data.pop(
'credit_fulfillment_signature')
# common transaction id
tx_id = uuid.uuid4()
tx_time = timezone.now()
# cached items to be used later
sender_available_balance = 0
recipient_available_balance = 0
swap_set = []
debit_tx_set_index = []
credit_tx_set_index = []
# recipient_fulfillment_tx_set_index = []
debit_tx_set_cache = []
credit_tx_set_cache = []
# recipient_fulfillment_tx_set_cache = []
debit_balance_signature_records = []
credit_balance_signature_records = []
debit_signature_records = []
credit_signature_records = []
recipient_fulfillment_signature_records = []
debit_balance_records = []
credit_balance_records = []
debit_active_state_records = []
credit_active_state_records = []
recipient_fulfillment_active_state_records = []
initial_swap_confirmed = False
# get current eon
current_eon = LocalViewInterface.latest().eon_number()
# initial swap eon should be the current eon number
if validated_data.pop('eon_number') != current_eon:
raise serializers.ValidationError(
detail='', code=ErrorCode.EON_NUMBER_OUT_OF_SYNC)
wallets = sorted([wallet, recipient], key=lambda w: w.token.id)
with RootCommitment.read_write_lock(
suffix=current_eon, auto_renewal=False), wallets[0].lock(
auto_renewal=False), wallets[1].lock(auto_renewal=False):
if RootCommitment.objects.filter(eon_number=current_eon +
1).exists():
raise serializers.ValidationError(
detail='Checkpoint was already created for this eon.',
code=ErrorCode.EON_NUMBER_OUT_OF_SYNC)
for eon_number in range(current_eon, current_eon + valid_eons):
swap = Transfer(tx_id=tx_id,
wallet=wallet,
amount=swap_amount,
eon_number=eon_number,
recipient=recipient,
nonce=swap_nonce,
amount_swapped=swap_amount_swapped,
swap=True,
sell_order=sell_order,
time=tx_time)
wallet_view_context = WalletTransferContext(wallet=wallet,
transfer=swap)
recipient_view_context = WalletTransferContext(
wallet=recipient, transfer=swap)
if eon_number == current_eon:
# Ensure sender log consistency
can_append_to_sender_log = wallet_view_context.can_schedule_transfer(
)
if can_append_to_sender_log is not True:
raise serializers.ValidationError(
detail='Sender: {}'.format(
can_append_to_sender_log),
code=ErrorCode.DEBIT_WALLET_CANNOT_ADD_TRANSACTION)
# Ensure recipient log consistency
can_append_to_recipient_log = recipient_view_context.can_schedule_transfer(
)
if can_append_to_recipient_log is not True:
raise serializers.ValidationError(
detail='Recipient: {}'.format(
can_append_to_recipient_log),
code=ErrorCode.CREDIT_WALLET_CANNOT_ADD_TRANSACTION
)
# Ensure swap consistency
can_spend, sender_available_balance = wallet_view_context.can_send_transfer(
current_eon_number=current_eon,
using_only_appended_funds=False)
if can_spend is not True:
raise serializers.ValidationError(
detail=can_spend,
code=ErrorCode.DEBIT_WALLET_OVERSPENDING)
# Ensure that sender balance is exactly equal to total outgoing amount
if sender_available_balance != swap.amount:
raise serializers.ValidationError(
detail=
'Sender balance should be exactly equal to outgoing swap amount, {} != {}.'
.format(sender_available_balance, swap.amount),
code=ErrorCode.DEBIT_WALLET_BALANCE_AMOUNT_MISMATCH
)
# Ensure that recipient balance is zero
recipient_available_balance = recipient_view_context.available_funds_at_eon(
eon_number=eon_number, only_appended=False)
if recipient_available_balance != 0:
raise serializers.ValidationError(
detail='Recipient balance should be exactly zero.',
code=ErrorCode.CREDIT_WALLET_BALANCE_NOT_ZERO)
current_eon_swap = swap
sender_highest_spendings, sender_highest_gains = wallet_view_context.off_chain_actively_sent_received_amounts(
eon_number=swap.eon_number, only_appended=False)
recipient_highest_spendings, recipient_highest_gains = recipient_view_context.off_chain_actively_sent_received_amounts(
eon_number=swap.eon_number, only_appended=False)
else:
sender_highest_spendings, sender_highest_gains = 0, 0
recipient_highest_spendings, recipient_highest_gains = 0, 0
# Minimum Debit Balance Marker
debit_balance_marker_signature_data = debit_balance_signatures[
eon_number - current_eon]
debit_balance_marker = MinimumAvailableBalanceMarker(
wallet=wallet, eon_number=eon_number, amount=0)
debit_balance_marker_checksum = crypto.hex_value(
debit_balance_marker.checksum())
debit_balance_marker_signature = Signature(
wallet=wallet,
checksum=debit_balance_marker_checksum,
value=debit_balance_marker_signature_data.get('value'))
if not debit_balance_marker_signature.is_valid():
raise serializers.ValidationError(
detail='',
code=ErrorCode.INVALID_DEBIT_BALANCE_SIGNATURE)
# Minimum Credit Balance Marker
credit_balance_marker_signature_data = credit_balance_signatures[
eon_number - current_eon]
credit_balance_marker = MinimumAvailableBalanceMarker(
wallet=recipient, eon_number=eon_number, amount=0)
credit_balance_marker_checksum = crypto.hex_value(
credit_balance_marker.checksum())
credit_balance_marker_signature = Signature(
wallet=recipient,
checksum=credit_balance_marker_checksum,
value=credit_balance_marker_signature_data.get('value'))
if not credit_balance_marker_signature.is_valid():
raise serializers.ValidationError(
detail='',
code=ErrorCode.INVALID_CREDIT_BALANCE_SIGNATURE)
assert (sender_available_balance == swap.amount)
# Debit Authorization
debit_active_state_signature_data = debit_signatures[
eon_number - current_eon]
debit_active_state, \
debit_active_state_signature, \
debit_transfer_index, \
debit_transfer_cache = check_active_state_signature(
swap,
wallet,
debit_active_state_signature_data,
eon_number > current_eon,
sender_available_balance,
sender_highest_spendings,
sender_highest_gains,
signature_type=SignatureType.DEBIT)
# Credit Authorization
credit_active_state_signature_data = credit_signatures[
eon_number - current_eon]
credit_active_state, \
credit_active_state_signature, \
credit_transfer_index, \
credit_transfer_cache = check_active_state_signature(
swap,
recipient,
credit_active_state_signature_data,
eon_number > current_eon,
recipient_available_balance,
recipient_highest_spendings,
recipient_highest_gains,
signature_type=SignatureType.CREDIT)
# Finality Authorization
recipient_fulfillment_active_state_signature_data = recipient_fulfillment_signatures[
eon_number - current_eon]
recipient_fulfillment_active_state, \
recipient_fulfillment_active_state_signature, \
recipient_fulfillment_transfer_index, \
recipient_fulfillment_transfer_cache = check_active_state_signature(
swap,
recipient,
recipient_fulfillment_active_state_signature_data,
eon_number > current_eon,
recipient_available_balance,
recipient_highest_spendings,
recipient_highest_gains,
signature_type=SignatureType.FULFILLMENT)
# accumulate records to be saved
debit_balance_signature_records.append(
debit_balance_marker_signature)
credit_balance_signature_records.append(
credit_balance_marker_signature)
debit_signature_records.append(debit_active_state_signature)
credit_signature_records.append(credit_active_state_signature)
recipient_fulfillment_signature_records.append(
recipient_fulfillment_active_state_signature)
debit_balance_records.append(debit_balance_marker)
credit_balance_records.append(credit_balance_marker)
debit_active_state_records.append(debit_active_state)
credit_active_state_records.append(credit_active_state)
recipient_fulfillment_active_state_records.append(
recipient_fulfillment_active_state)
debit_tx_set_index.append(debit_transfer_index)
credit_tx_set_index.append(credit_transfer_index)
# recipient_fulfillment_tx_set_index.append(recipient_fulfillment_transfer_index)
debit_tx_set_cache.append(debit_transfer_cache)
credit_tx_set_cache.append(credit_transfer_cache)
# recipient_fulfillment_tx_set_cache.append(recipient_fulfillment_transfer_cache)
swap_set.append(swap)
assert (swap_set[0] is not None
and swap_set[0].eon_number == current_eon)
assert (len(swap_set) == valid_eons)
# locking context covers saving the state as well to make sure checkpoint creation is consistent
with transaction.atomic():
Signature.objects.bulk_create(
debit_balance_signature_records +
credit_balance_signature_records +
debit_signature_records + credit_signature_records +
recipient_fulfillment_signature_records)
for index in range(valid_eons):
debit_balance_records[
index].signature = debit_balance_signature_records[
index]
credit_balance_records[
index].signature = credit_balance_signature_records[
index]
debit_active_state_records[
index].wallet_signature = debit_signature_records[
index]
credit_active_state_records[
index].wallet_signature = credit_signature_records[
index]
recipient_fulfillment_active_state_records[
index].wallet_signature = recipient_fulfillment_signature_records[
index]
ActiveState.objects.bulk_create(
debit_active_state_records + credit_active_state_records +
recipient_fulfillment_active_state_records)
MinimumAvailableBalanceMarker.objects.bulk_create(
debit_balance_records + credit_balance_records)
for index in range(valid_eons):
swap_set[
index].sender_active_state = debit_active_state_records[
index]
swap_set[
index].recipient_active_state = credit_active_state_records[
index]
swap_set[
index].recipient_fulfillment_active_state = recipient_fulfillment_active_state_records[
index]
swap_set[
index].sender_balance_marker = debit_balance_records[
index]
swap_set[
index].sender_starting_balance = sender_available_balance
swap_set[
index].recipient_starting_balance = recipient_available_balance
# cache swap index in sender active set
swap_set[index].sender_merkle_index = debit_tx_set_index[
index]
# cache swap index in recipient active set
swap_set[
index].recipient_merkle_index = credit_tx_set_index[
index]
# cache active set merkle mountains height array and hash array for sender active set
swap_set[index].sender_merkle_hash_cache, swap_set[
index].sender_merkle_height_cache = debit_tx_set_cache[
index]
# cache active set merkle mountains height array and hash array for recipient active set
swap_set[index].recipient_merkle_hash_cache, swap_set[
index].recipient_merkle_height_cache = debit_tx_set_cache[
index]
Transfer.objects.bulk_create(swap_set)
swap_set[0].sign_swap(settings.HUB_OWNER_ACCOUNT_ADDRESS,
settings.HUB_OWNER_ACCOUNT_KEY)
initial_swap_confirmed = True
if initial_swap_confirmed:
operator_celery.send_task('auditor.tasks.on_swap_confirmation',
args=[swap_set[0].id])
return swap_set[0]
def update(self, swap, validated_data):
current_swap = None
is_swap_finalized = False
with transaction.atomic():
current_eon = LocalViewInterface.latest().eon_number()
swap_set = Transfer.objects.select_for_update().filter(
tx_id=swap.tx_id, eon_number__gte=current_eon,
swap=True).order_by('eon_number')
current_swap = swap_set[0]
if not current_swap.complete:
raise serializers.ValidationError(
detail='', code=ErrorCode.SWAP_NOT_FULFILLED)
elif current_swap.cancelled:
raise serializers.ValidationError(
detail='', code=ErrorCode.SWAP_ALREADY_FROZEN)
elif current_swap.voided:
raise serializers.ValidationError(
detail='', code=ErrorCode.SWAP_ALREADY_VOIDED)
elif current_swap.processed:
raise serializers.ValidationError(
detail='', code=ErrorCode.SWAP_ALREADY_CLOSED)
elif current_swap.recipient_finalization_active_state is not None:
raise serializers.ValidationError(
detail='', code=ErrorCode.SWAP_ALREADY_FINALIZED)
finalization_signatures = validated_data.pop(
'finalization_signature')
# state to save
finalization_active_state_signature_records = []
finalization_active_state_records = []
if swap_set.count() != len(finalization_signatures):
raise serializers.ValidationError(
detail=
'Wrong number of finalization signatures, expected {} but got {}'
.format(swap_set.count(), len(finalization_signatures)),
code=ErrorCode.WRONG_NUMBER_OF_CREDIT_SIGNATURES)
recipient_view_context = WalletTransferContext(
wallet=current_swap.recipient, transfer=current_swap)
tx_set_tree = recipient_view_context.optimized_authorized_transfers_tree(
)
tx_set_hash = crypto.hex_value(tx_set_tree.root_hash())
transfer_index = tx_set_tree.merkle_tree_nonce_map.get(
current_swap.nonce)
transfer_proof = tx_set_tree.proof(transfer_index)
highest_spendings, highest_gains = recipient_view_context.off_chain_actively_sent_received_amounts(
eon_number=current_swap.eon_number, only_appended=False)
finalization_active_state = ActiveState(
wallet=current_swap.recipient,
updated_spendings=highest_spendings +
current_swap.amount_swapped,
updated_gains=highest_gains + current_swap.amount_swapped,
tx_set_hash=tx_set_hash,
tx_set_proof_hashes=transfer_proof,
tx_set_index=transfer_index,
eon_number=current_swap.eon_number)
finalization_active_state_signature_data = finalization_signatures[
0]
finalization_active_state_checksum = crypto.hex_value(
finalization_active_state.checksum())
finalization_active_state_signature = Signature(
wallet=current_swap.recipient,
checksum=finalization_active_state_checksum,
value=finalization_active_state_signature_data.get('value'))
if not finalization_active_state_signature.is_valid():
raise serializers.ValidationError(
detail='', code=ErrorCode.INVALID_CREDIT_SIGNATURE)
finalization_active_state_signature_records.append(
finalization_active_state_signature)
finalization_active_state_records.append(finalization_active_state)
# calculate future spent, gained, empty tx set
future_spent_gained = max(highest_spendings,
highest_gains) + swap.amount_swapped + 1
empty_tx_set_hash = crypto.hex_value(NODE_CACHE[0]['hash'])
for index in range(1, len(swap_set)):
future_swap = swap_set[index]
finalization_active_state = ActiveState(
wallet=future_swap.recipient,
updated_spendings=future_spent_gained,
updated_gains=future_spent_gained,
tx_set_hash=empty_tx_set_hash,
# any dummy value
tx_set_proof_hashes='',
# any dummy value
tx_set_index=0,
eon_number=future_swap.eon_number)
finalization_active_state_checksum = crypto.hex_value(
finalization_active_state.checksum())
finalization_active_state_signature = Signature(
wallet=swap.recipient,
checksum=finalization_active_state_checksum,
value=finalization_signatures[index].get('value'))
if not finalization_active_state_signature.is_valid():
raise serializers.ValidationError(
detail='',
code=ErrorCode.INVALID_FUTURE_CREDIT_SIGNATURE)
finalization_active_state_signature_records.append(
finalization_active_state_signature)
finalization_active_state_records.append(
finalization_active_state)
Signature.objects.bulk_create(
finalization_active_state_signature_records)
with current_swap.lock(
auto_renewal=False), current_swap.wallet.lock(
auto_renewal=False), current_swap.recipient.lock(
auto_renewal=False):
for index in range(len(finalization_active_state_records)):
finalization_active_state_records[
index].wallet_signature = finalization_active_state_signature_records[
index]
ActiveState.objects.bulk_create(
finalization_active_state_records)
for index in range(len(swap_set)):
swap_set[
index].recipient_finalization_active_state = finalization_active_state_records[
index]
if index > 0:
swap_set[index].voided = True
swap_set[index].appended = False
swap_set[index].processed = True
Transfer.objects.bulk_update(swap_set, [
'recipient_finalization_active_state', 'voided',
'appended', 'processed'
])
swap_set[0].sign_swap_finalization(
settings.HUB_OWNER_ACCOUNT_ADDRESS,
settings.HUB_OWNER_ACCOUNT_KEY)
swap_set[0].close(complete=True, appended=True)
current_swap = swap_set[0]
is_swap_finalized = True
if is_swap_finalized:
operator_celery.send_task('auditor.tasks.on_swap_finalization',
args=[current_swap.id])
return current_swap
def update(self, swap, validated_data):
current_swap = None
is_swap_cancelled = False
with transaction.atomic():
current_eon = LocalViewInterface.latest().eon_number()
swap_set = Transfer.objects.select_for_update().filter(
tx_id=swap.tx_id, eon_number__gte=current_eon,
swap=True).order_by('eon_number')
current_swap = swap_set[0]
if not current_swap.cancelled:
raise serializers.ValidationError(
detail='', code=ErrorCode.SWAP_NOT_FROZEN)
elif current_swap.processed:
raise serializers.ValidationError(
detail='', code=ErrorCode.SWAP_ALREADY_CLOSED)
elif current_swap.swap_freezing_signature is None:
raise serializers.ValidationError(
detail='', code=ErrorCode.MISSING_FREEZING_SIGNATURE)
elif None not in [
current_swap.sender_cancellation_active_state,
current_swap.recipient_cancellation_active_state
]:
raise serializers.ValidationError(
detail='', code=ErrorCode.SWAP_ALREADY_CANCELLED)
sender_cancellation_signatures = validated_data.get(
'sender_cancellation_signature')
recipient_cancellation_signatures = validated_data.get(
'recipient_cancellation_signature')
# state to save
sender_cancellation_active_state_signature_records = []
sender_cancellation_active_state_records = []
recipient_cancellation_active_state_signature_records = []
recipient_cancellation_active_state_records = []
# make sure appropriate number of signatures was provided
if swap_set.count() != len(sender_cancellation_signatures):
raise serializers.ValidationError(
detail=
'Wrong number of sender cancellation signatures, expected {} but got {}'
.format(swap_set.count(),
len(sender_cancellation_signatures)),
code=ErrorCode.WRONG_NUMBER_OF_DEBIT_SIGNATURES)
if swap_set.count() != len(recipient_cancellation_signatures):
raise serializers.ValidationError(
detail=
'Wrong number of recipient cancellation signatures, expected {} but got {}'
.format(swap_set.count(),
len(recipient_cancellation_signatures)),
code=ErrorCode.WRONG_NUMBER_OF_CREDIT_SIGNATURES)
sender_view_context = WalletTransferContext(
wallet=current_swap.wallet, transfer=current_swap)
debit_tx_set_tree = sender_view_context.optimized_authorized_transfers_tree(
force_append=False, assume_active_state_exists=True)
tx_set_hash = crypto.hex_value(debit_tx_set_tree.root_hash())
transfer_index = debit_tx_set_tree.merkle_tree_nonce_map.get(
current_swap.nonce)
transfer_proof = debit_tx_set_tree.proof(transfer_index)
sender_highest_spendings, sender_highest_gains = sender_view_context.off_chain_actively_sent_received_amounts(
eon_number=current_swap.eon_number, only_appended=False)
matched_out, _ = current_swap.matched_amounts()
sender_highest_gains += current_swap.amount - matched_out
sender_cancellation_active_state = ActiveState(
wallet=current_swap.wallet,
updated_spendings=sender_highest_spendings,
updated_gains=sender_highest_gains,
tx_set_hash=tx_set_hash,
tx_set_proof_hashes=transfer_proof,
tx_set_index=transfer_index,
eon_number=current_swap.eon_number)
sender_cancellation_active_state_checksum = crypto.hex_value(
sender_cancellation_active_state.checksum())
sender_cancellation_active_state_signature = Signature(
wallet=current_swap.wallet,
checksum=sender_cancellation_active_state_checksum,
value=sender_cancellation_signatures[0].get('value'))
if not sender_cancellation_active_state_signature.is_valid():
raise serializers.ValidationError(
detail='', code=ErrorCode.INVALID_DEBIT_SIGNATURE)
sender_cancellation_active_state_records.append(
sender_cancellation_active_state)
sender_cancellation_active_state_signature_records.append(
sender_cancellation_active_state_signature)
recipient_view_context = WalletTransferContext(
wallet=current_swap.recipient, transfer=current_swap)
credit_tx_set_tree = recipient_view_context.optimized_authorized_transfers_tree(
force_append=False, assume_active_state_exists=True)
tx_set_hash = crypto.hex_value(credit_tx_set_tree.root_hash())
transfer_index = credit_tx_set_tree.merkle_tree_nonce_map.get(
current_swap.nonce)
transfer_proof = credit_tx_set_tree.proof(transfer_index)
recipient_highest_spendings, recipient_highest_gains = recipient_view_context.off_chain_actively_sent_received_amounts(
eon_number=current_swap.eon_number, only_appended=False)
recipient_cancellation_active_state = ActiveState(
wallet=current_swap.recipient,
updated_spendings=recipient_highest_spendings +
current_swap.amount_swapped,
updated_gains=recipient_highest_gains +
current_swap.amount_swapped,
tx_set_hash=tx_set_hash,
tx_set_proof_hashes=transfer_proof,
tx_set_index=transfer_index,
eon_number=current_swap.eon_number)
recipient_cancellation_active_state_checksum = crypto.hex_value(
recipient_cancellation_active_state.checksum())
recipient_cancellation_active_state_signature = Signature(
wallet=current_swap.recipient,
checksum=recipient_cancellation_active_state_checksum,
value=recipient_cancellation_signatures[0].get('value'))
if not recipient_cancellation_active_state_signature.is_valid():
raise serializers.ValidationError(
detail='', code=ErrorCode.INVALID_CREDIT_SIGNATURE)
recipient_cancellation_active_state_records.append(
recipient_cancellation_active_state)
recipient_cancellation_active_state_signature_records.append(
recipient_cancellation_active_state_signature)
# calculate future spent, gained, empty tx set
empty_tx_set_hash = crypto.hex_value(NODE_CACHE[0]['hash'])
sender_future_spent_gained = max(sender_highest_spendings,
sender_highest_gains) + 1
recipient_future_spent_gained = max(
recipient_highest_spendings,
recipient_highest_gains) + current_swap.amount_swapped + 1
for index in range(1, len(swap_set)):
future_swap = swap_set[index]
sender_cancellation_active_state = ActiveState(
wallet=future_swap.wallet,
updated_spendings=sender_future_spent_gained,
updated_gains=sender_future_spent_gained,
tx_set_hash=empty_tx_set_hash,
# any dummy value
tx_set_proof_hashes='',
# any dummy value
tx_set_index=0,
eon_number=future_swap.eon_number)
sender_cancellation_active_state_checksum = crypto.hex_value(
sender_cancellation_active_state.checksum())
sender_cancellation_active_state_signature = Signature(
wallet=future_swap.recipient,
checksum=sender_cancellation_active_state_checksum,
value=sender_cancellation_signatures[index].get('value'))
if not sender_cancellation_active_state_signature.is_valid():
raise serializers.ValidationError(
detail='',
code=ErrorCode.INVALID_FUTURE_DEBIT_SIGNATURE)
sender_cancellation_active_state_signature_records.append(
sender_cancellation_active_state_signature)
sender_cancellation_active_state_records.append(
sender_cancellation_active_state)
recipient_cancellation_active_state = ActiveState(
wallet=future_swap.recipient,
updated_spendings=recipient_future_spent_gained,
updated_gains=recipient_future_spent_gained,
tx_set_hash=empty_tx_set_hash,
# any dummy value
tx_set_proof_hashes='',
# any dummy value
tx_set_index=0,
eon_number=future_swap.eon_number)
recipient_cancellation_active_state_checksum = crypto.hex_value(
recipient_cancellation_active_state.checksum())
recipient_cancellation_active_state_signature = Signature(
wallet=future_swap.recipient,
checksum=recipient_cancellation_active_state_checksum,
value=recipient_cancellation_signatures[index].get(
'value'))
if not recipient_cancellation_active_state_signature.is_valid(
):
raise serializers.ValidationError(
detail='',
code=ErrorCode.INVALID_FUTURE_CREDIT_SIGNATURE)
recipient_cancellation_active_state_signature_records.append(
recipient_cancellation_active_state_signature)
recipient_cancellation_active_state_records.append(
recipient_cancellation_active_state)
assert (len(swap_set) == len(
sender_cancellation_active_state_signature_records))
assert (len(swap_set) == len(
recipient_cancellation_active_state_signature_records))
Signature.objects.bulk_create(
sender_cancellation_active_state_signature_records +
recipient_cancellation_active_state_signature_records)
with current_swap.lock(
auto_renewal=False), current_swap.wallet.lock(
auto_renewal=False), current_swap.recipient.lock(
auto_renewal=False):
for index in range(len(swap_set)):
sender_cancellation_active_state_records[
index].wallet_signature = sender_cancellation_active_state_signature_records[
index]
recipient_cancellation_active_state_records[
index].wallet_signature = recipient_cancellation_active_state_signature_records[
index]
ActiveState.objects.bulk_create(
sender_cancellation_active_state_records +
recipient_cancellation_active_state_records)
for index in range(len(swap_set)):
swap_set[
index].sender_cancellation_active_state = sender_cancellation_active_state_records[
index]
swap_set[
index].recipient_cancellation_active_state = recipient_cancellation_active_state_records[
index]
if index > 0:
swap_set[index].voided = True
swap_set[index].appended = False
swap_set[index].processed = True
Transfer.objects.bulk_update(swap_set, [
'sender_cancellation_active_state',
'recipient_cancellation_active_state', 'voided',
'appended', 'processed'
])
swap_set[0].sign_swap_cancellation(
settings.HUB_OWNER_ACCOUNT_ADDRESS,
settings.HUB_OWNER_ACCOUNT_KEY)
swap_set[0].close(cancelled=True, appended=True)
current_swap = swap_set[0]
is_swap_cancelled = True
if is_swap_cancelled:
operator_celery.send_task('auditor.tasks.on_swap_cancellation',
args=[current_swap.id])
return current_swap
def send_transaction(test_case,
eon_number,
sender,
recipient,
amount,
nonce,
token,
expected_status=status.HTTP_201_CREATED):
# Sender account
sender_wallet = Wallet.objects.get(address=remove_0x_prefix(
sender.get('address')),
token=token)
# Recipient account
recipient_wallet = Wallet.objects.get(address=remove_0x_prefix(
recipient.get('address')),
token=token)
transfer = Transfer(wallet=sender_wallet,
amount=amount,
eon_number=eon_number,
recipient=recipient_wallet,
nonce=nonce,
passive=True)
sender_view_context = WalletTransferContext(wallet=sender_wallet,
transfer=transfer)
sender_highest_spent, sender_highest_gained = sender_view_context.off_chain_actively_sent_received_amounts(
eon_number=eon_number, only_appended=False)
updated_spendings = sender_highest_spent + amount
# Authorize transaction
transfer_set_root = hex_value(
sender_view_context.authorized_transfers_tree_root(only_appended=False,
force_append=True))
active_state = ActiveState(wallet=sender_wallet,
updated_spendings=updated_spendings,
updated_gains=sender_highest_gained,
eon_number=eon_number,
tx_set_hash=transfer_set_root)
sender_active_state_authorization = sign_message(active_state.checksum(),
sender.get('pk'))
sender_active_state_signature = Signature(
wallet=sender_wallet,
checksum=hex_value(active_state.checksum()),
value=encode_signature(sender_active_state_authorization))
test_case.assertTrue(sender_active_state_signature.is_valid())
_, available_balance = sender_view_context.can_send_transfer(
current_eon_number=eon_number, using_only_appended_funds=False)
new_balance = available_balance - transfer.amount
concise_balance_marker = MinimumAvailableBalanceMarker(
wallet=sender_wallet, eon_number=eon_number, amount=new_balance)
sender_concise_balance_marker_authorization = sign_message(
concise_balance_marker.checksum(), sender.get('pk'))
concise_balance_marker_signature = Signature(
wallet=sender_wallet,
checksum=hex_value(concise_balance_marker.checksum()),
value=encode_signature(sender_concise_balance_marker_authorization))
test_case.assertTrue(concise_balance_marker_signature.is_valid())
print("Sender view:")
print("available_balance:", available_balance)
print("transfer_set_root:", transfer_set_root)
print("active_state.updated_spendings:", active_state.updated_spendings)
print("active_state.updated_gains:", active_state.updated_gains)
# Make API Request
url = reverse('transfer-endpoint')
data = {
'debit_signature': {
'value': encode_signature(sender_active_state_authorization),
},
'debit_balance_signature': {
'value':
encode_signature(sender_concise_balance_marker_authorization),
},
'debit_balance': new_balance,
'eon_number': eon_number,
'amount': amount,
'nonce': nonce,
'wallet': {
'address': sender_wallet.address,
'token': sender_wallet.token.address,
},
'recipient': {
'address': recipient_wallet.address,
'token': recipient_wallet.token.address,
},
}
# Send tx to server
x = datetime.datetime.now()
response = test_case.client.post(url, data, format='json')
y = datetime.datetime.now()
delta = y - x
# Ensure the transaction was recorded
test_case.assertEqual(response.status_code, expected_status,
'\n'.join([url,
str(data),
str(response.content)]))
print('TX Time: {}s for {}'.format(delta, amount))
# fo rpassive transfer assert that transaction is confirmed
tx = json.loads(response.content)
transfer = Transfer.objects.get(id=tx['id'])
test_case.assertTrue(transfer.complete)
test_case.assertTrue(transfer.appended)
test_case.assertNotEqual(transfer.sender_active_state.operator_signature,
None)
# Log time delta
return delta