def handle_unlock(mediator_state, state_change: ReceiveUnlock, channelidentifiers_to_channels):
""" Handle a ReceiveUnlock state change. """
events = list()
balance_proof_sender = state_change.balance_proof.sender
channel_identifier = state_change.balance_proof.channel_address
for pair in mediator_state.transfers_pair:
if pair.payer_transfer.balance_proof.sender == balance_proof_sender:
channel_state = channelidentifiers_to_channels.get(channel_identifier)
if channel_state:
is_valid, channel_events, _ = channel.handle_unlock(
channel_state,
state_change,
)
events.extend(channel_events)
if is_valid:
unlock = EventUnlockClaimSuccess(
pair.payee_transfer.payment_identifier,
pair.payee_transfer.lock.secrethash,
)
events.append(unlock)
send_processed = SendProcessed(
balance_proof_sender,
b'global',
state_change.message_identifier,
)
events.append(send_processed)
pair.payer_state = 'payer_balance_proof'
iteration = TransitionResult(mediator_state, events)
return iteration
def handle_unlock(target_state, state_change: ReceiveUnlock, channel_state):
""" Handles a ReceiveUnlock state change. """
iteration = TransitionResult(target_state, list())
balance_proof_sender = state_change.balance_proof.sender
if balance_proof_sender == target_state.route.node_address:
is_valid, events, _ = channel.handle_unlock(
channel_state,
state_change,
)
if is_valid:
transfer = target_state.transfer
transfer_success = EventTransferReceivedSuccess(
transfer.payment_identifier,
transfer.lock.amount,
transfer.initiator,
)
unlock_success = EventUnlockClaimSuccess(
transfer.payment_identifier,
transfer.lock.secrethash,
)
send_processed = SendProcessed(
balance_proof_sender,
b'global',
state_change.message_identifier,
)
events.extend([transfer_success, unlock_success, send_processed])
iteration = TransitionResult(None, events)
return iteration
def claim_lock(app_chain, identifier, token, secret):
""" Unlock a pending transfer. """
secrethash = sha3(secret)
for from_, to_ in zip(app_chain[:-1], app_chain[1:]):
from_channel = get_channelstate(from_, to_, token)
partner_channel = get_channelstate(to_, from_, token)
unlock_lock = channel.send_unlock(
from_channel,
identifier,
secret,
secrethash,
)
secret_message = Secret(
unlock_lock.identifier,
unlock_lock.balance_proof.nonce,
unlock_lock.balance_proof.channel_address,
unlock_lock.balance_proof.transferred_amount,
unlock_lock.balance_proof.locksroot,
unlock_lock.secret,
)
from_.raiden.sign(secret_message)
balance_proof = balanceproof_from_envelope(secret_message)
receive_unlock = ReceiveUnlock(
unlock_lock.secret,
balance_proof,
)
is_valid, msg = channel.handle_unlock(
partner_channel,
receive_unlock,
)
assert is_valid, msg
def handle_unlock(target_state, state_change, channel_state):
""" Handles a ReceiveUnlock state change. """
iteration = TransitionResult(target_state, list())
balance_proof_sender = state_change.balance_proof.sender
if balance_proof_sender == target_state.route.node_address:
is_valid, events, _ = channel.handle_unlock(
channel_state,
state_change,
)
if is_valid:
transfer = target_state.transfer
transfer_success = EventTransferReceivedSuccess(
transfer.payment_identifier,
transfer.lock.amount,
transfer.initiator,
)
unlock_success = EventUnlockClaimSuccess(
transfer.payment_identifier,
transfer.lock.secrethash,
)
send_processed = SendProcessed(
balance_proof_sender,
b'global',
state_change.message_identifier,
)
events.extend([transfer_success, unlock_success, send_processed])
iteration = TransitionResult(None, events)
return iteration
def handle_unlock(mediator_state, state_change, channelidentifiers_to_channels):
""" Handle a ReceiveUnlock state change. """
events = list()
balance_proof_sender = state_change.balance_proof.sender
channel_identifier = state_change.balance_proof.channel_address
for pair in mediator_state.transfers_pair:
if pair.payer_transfer.balance_proof.sender == balance_proof_sender:
channel_state = channelidentifiers_to_channels.get(channel_identifier)
if channel_state:
is_valid, channel_events, _ = channel.handle_unlock(
channel_state,
state_change,
)
events.extend(channel_events)
if is_valid:
unlock = EventUnlockClaimSuccess(
pair.payee_transfer.payment_identifier,
pair.payee_transfer.lock.secrethash,
)
events.append(unlock)
send_processed = SendProcessed(
balance_proof_sender,
b'global',
state_change.message_identifier,
)
events.append(send_processed)
pair.payer_state = 'payer_balance_proof'
iteration = TransitionResult(mediator_state, events)
return iteration
def handle_unlock(mediator_state, state_change, channelidentifiers_to_channels):
""" Handle a ReceiveUnlock state change. """
events = list()
balance_proof_sender = state_change.balance_proof.sender
channel_identifier = state_change.balance_proof.channel_address
for pair in mediator_state.transfers_pair:
if pair.payer_transfer.balance_proof.sender == balance_proof_sender:
channel_state = channelidentifiers_to_channels.get(channel_identifier)
if channel_state:
is_valid, _ = channel.handle_unlock(
channel_state,
state_change,
)
if is_valid:
withdraw = EventWithdrawSuccess(
pair.payee_transfer.payment_identifier,
pair.payee_transfer.lock.secrethash,
)
events.append(withdraw)
pair.payer_state = 'payer_balance_proof'
iteration = TransitionResult(mediator_state, events)
return iteration
def handle_unlock(
target_state: TargetTransferState,
state_change: ReceiveUnlock,
channel_state: NettingChannelState,
) -> TransitionResult[TargetTransferState]:
""" Handles a ReceiveUnlock state change. """
balance_proof_sender = state_change.balance_proof.sender
is_valid, events, _ = channel.handle_unlock(channel_state, state_change)
next_target_state: Optional[TargetTransferState] = target_state
if is_valid:
transfer = target_state.transfer
payment_received_success = EventPaymentReceivedSuccess(
payment_network_identifier=channel_state.payment_network_identifier,
token_network_identifier=TokenNetworkID(channel_state.token_network_identifier),
identifier=transfer.payment_identifier,
amount=TokenAmount(transfer.lock.amount),
initiator=transfer.initiator,
)
unlock_success = EventUnlockClaimSuccess(
transfer.payment_identifier, transfer.lock.secrethash
)
send_processed = SendProcessed(
recipient=balance_proof_sender,
channel_identifier=CHANNEL_IDENTIFIER_GLOBAL_QUEUE,
message_identifier=state_change.message_identifier,
)
events.extend([payment_received_success, unlock_success, send_processed])
next_target_state = None
return TransitionResult(next_target_state, events)
def handle_unlock(
target_state: TargetTransferState,
state_change: ReceiveUnlock,
channel_state: NettingChannelState,
):
""" Handles a ReceiveUnlock state change. """
iteration = TransitionResult(target_state, list())
balance_proof_sender = state_change.balance_proof.sender
if balance_proof_sender == target_state.route.node_address:
is_valid, events, _ = channel.handle_unlock(
channel_state,
state_change,
)
if is_valid:
transfer = target_state.transfer
payment_received_success = EventPaymentReceivedSuccess(
payment_network_identifier=channel_state.
payment_network_identifier,
token_network_identifier=channel_state.
token_network_identifier,
identifier=transfer.payment_identifier,
amount=transfer.lock.amount,
initiator=transfer.initiator,
)
unlock_success = EventUnlockClaimSuccess(
transfer.payment_identifier,
transfer.lock.secrethash,
)
send_processed = SendProcessed(
recipient=balance_proof_sender,
channel_identifier=CHANNEL_IDENTIFIER_GLOBAL_QUEUE,
message_identifier=state_change.message_identifier,
)
events.extend(
[payment_received_success, unlock_success, send_processed])
iteration = TransitionResult(None, events)
return iteration
def claim_lock(app_chain, payment_identifier, token_network_identifier,
secret):
""" Unlock a pending transfer. """
secrethash = sha3(secret)
for from_, to_ in zip(app_chain[:-1], app_chain[1:]):
from_channel = get_channelstate(from_, to_, token_network_identifier)
partner_channel = get_channelstate(to_, from_,
token_network_identifier)
unlock_lock = channel.send_unlock(
from_channel,
random.randint(0, UINT64_MAX),
payment_identifier,
secret,
secrethash,
)
secret_message = Secret(
chain_id=unlock_lock.balance_proof.chain_id,
message_identifier=unlock_lock.message_identifier,
payment_identifier=unlock_lock.payment_identifier,
nonce=unlock_lock.balance_proof.nonce,
token_network_address=partner_channel.token_network_identifier,
channel_identifier=unlock_lock.balance_proof.channel_identifier,
transferred_amount=unlock_lock.balance_proof.transferred_amount,
locked_amount=unlock_lock.balance_proof.locked_amount,
locksroot=unlock_lock.balance_proof.locksroot,
secret=unlock_lock.secret,
)
from_.raiden.sign(secret_message)
balance_proof = balanceproof_from_envelope(secret_message)
receive_unlock = ReceiveUnlock(
message_identifier=random.randint(0, UINT64_MAX),
secret=unlock_lock.secret,
balance_proof=balance_proof,
)
is_valid, _, msg = channel.handle_unlock(
partner_channel,
receive_unlock,
)
assert is_valid, msg
def claim_lock(app_chain, payment_identifier, token_network_identifier, secret):
""" Unlock a pending transfer. """
secrethash = sha3(secret)
for from_, to_ in zip(app_chain[:-1], app_chain[1:]):
from_channel = get_channelstate(from_, to_, token_network_identifier)
partner_channel = get_channelstate(to_, from_, token_network_identifier)
unlock_lock = channel.send_unlock(
from_channel,
random.randint(0, UINT64_MAX),
payment_identifier,
secret,
secrethash,
)
secret_message = Secret(
unlock_lock.balance_proof.chain_id,
unlock_lock.message_identifier,
unlock_lock.payment_identifier,
unlock_lock.balance_proof.nonce,
partner_channel.token_network_identifier,
unlock_lock.balance_proof.channel_address,
unlock_lock.balance_proof.transferred_amount,
unlock_lock.balance_proof.locked_amount,
unlock_lock.balance_proof.locksroot,
unlock_lock.secret,
)
from_.raiden.sign(secret_message)
balance_proof = balanceproof_from_envelope(secret_message)
receive_unlock = ReceiveUnlock(
message_identifier=random.randint(0, UINT64_MAX),
secret=unlock_lock.secret,
balance_proof=balance_proof,
)
is_valid, _, msg = channel.handle_unlock(
partner_channel,
receive_unlock,
)
assert is_valid, msg
def handle_unlock(
target_state: TargetTransferState,
state_change: ReceiveUnlock,
channel_state: NettingChannelState,
):
""" Handles a ReceiveUnlock state change. """
balance_proof_sender = state_change.balance_proof.sender
is_valid, events, _ = channel.handle_unlock(
channel_state,
state_change,
)
if is_valid:
transfer = target_state.transfer
payment_received_success = EventPaymentReceivedSuccess(
payment_network_identifier=channel_state.payment_network_identifier,
token_network_identifier=channel_state.token_network_identifier,
identifier=transfer.payment_identifier,
amount=transfer.lock.amount,
initiator=transfer.initiator,
)
unlock_success = EventUnlockClaimSuccess(
transfer.payment_identifier,
transfer.lock.secrethash,
)
send_processed = SendProcessed(
recipient=balance_proof_sender,
channel_identifier=CHANNEL_IDENTIFIER_GLOBAL_QUEUE,
message_identifier=state_change.message_identifier,
)
events.extend([payment_received_success, unlock_success, send_processed])
target_state = None
return TransitionResult(target_state, events)
def test_interwoven_transfers():
"""Can keep doing transactions even if not all secrets have been released."""
number_of_transfers = 100
balance_for_all_transfers = 11 * number_of_transfers
lock_amounts = cycle([1, 3, 5, 7, 11])
lock_secrets = [
format(i, '>032').encode()
for i in range(number_of_transfers)
]
our_model, _ = create_model(70)
partner_model, privkey2 = create_model(balance_for_all_transfers)
channel_state = create_channel_from_models(our_model, partner_model)
block_number = 1000
nonce = 0
transferred_amount = 0
our_model_current = our_model
partner_model_current = partner_model
for i, (lock_amount, lock_secret) in enumerate(zip(lock_amounts, lock_secrets)):
nonce += 1
block_number += 1
lock_expiration = block_number + channel_state.settle_timeout - 1
lock_secrethash = sha3(lock_secret)
lock = HashTimeLockState(
lock_amount,
lock_expiration,
lock_secrethash,
)
merkletree_leaves = list(partner_model_current.merkletree_leaves)
merkletree_leaves.append(lock.lockhash)
partner_model_current = partner_model_current._replace(
distributable=partner_model_current.distributable - lock_amount,
amount_locked=partner_model_current.amount_locked + lock_amount,
next_nonce=partner_model_current.next_nonce + 1,
merkletree_leaves=merkletree_leaves,
)
receive_lockedtransfer = make_receive_transfer_mediated(
channel_state,
privkey2,
nonce,
transferred_amount,
lock,
merkletree_leaves=merkletree_leaves,
)
is_valid, msg = channel.handle_receive_lockedtransfer(
channel_state,
receive_lockedtransfer,
)
assert is_valid, msg
assert_partner_state(
channel_state.our_state,
channel_state.partner_state,
our_model_current,
)
assert_partner_state(
channel_state.partner_state,
channel_state.our_state,
partner_model_current,
)
# claim a transaction at every other iteration, leaving the current one
# in place
if i % 2:
# Update our model:
# - Increase nonce because the secret is a new balance proof
# - The lock is removed from the merkle tree, the balance proof must be updated
# - The locksroot must have unlocked lock removed
# - The transferred amount must be increased by the lock amount
# - This changes the balance for both participants:
# - the sender balance and locked amount is decremented by the lock amount
# - the receiver balance and distributable is incremented by the lock amount
nonce += 1
transferred_amount += lock_amount
merkletree_leaves = list(partner_model_current.merkletree_leaves)
merkletree_leaves.remove(lock.lockhash)
tree = compute_layers(merkletree_leaves)
locksroot = tree[MERKLEROOT][0]
partner_model_current = partner_model_current._replace(
amount_locked=partner_model_current.amount_locked - lock_amount,
balance=partner_model_current.balance - lock_amount,
next_nonce=partner_model_current.next_nonce + 1,
merkletree_leaves=merkletree_leaves,
)
our_model_current = our_model_current._replace(
balance=our_model_current.balance + lock_amount,
distributable=our_model_current.distributable + lock_amount,
)
message_identifier = random.randint(0, UINT64_MAX)
secret_message = Secret(
message_identifier=message_identifier,
payment_identifier=nonce,
nonce=nonce,
channel=channel_state.identifier,
transferred_amount=transferred_amount,
locksroot=locksroot,
secret=lock_secret,
)
secret_message.sign(privkey2, channel_state.partner_state.address)
balance_proof = balanceproof_from_envelope(secret_message)
unlock_state_change = ReceiveUnlock(
lock_secret,
balance_proof,
)
is_valid, msg = channel.handle_unlock(channel_state, unlock_state_change)
assert is_valid, msg
assert_partner_state(
channel_state.our_state,
channel_state.partner_state,
our_model_current,
)
assert_partner_state(
channel_state.partner_state,
channel_state.our_state,
partner_model_current,
)
def test_channelstate_receive_lockedtransfer():
"""Tests receiving a mediated transfer.
The transfer is done in three steps:
- a mediated transfer including a lock in its balance proof is sent
- the secret is revealed
- the unlocked balance proof is sent updating the transferred_amount
"""
our_model1, _ = create_model(70)
partner_model1, privkey2 = create_model(100)
channel_state = create_channel_from_models(our_model1, partner_model1)
# Step 1: Simulate receiving a transfer
# - The receiver end state doesnt change
# - The lock must be registered with the sender end
lock_amount = 30
lock_expiration = 10
lock_secret = sha3(b'test_end_state')
lock_secrethash = sha3(lock_secret)
lock = HashTimeLockState(
lock_amount,
lock_expiration,
lock_secrethash,
)
nonce = 1
transferred_amount = 0
receive_lockedtransfer = make_receive_transfer_mediated(
channel_state,
privkey2,
nonce,
transferred_amount,
lock,
)
is_valid, msg = channel.handle_receive_lockedtransfer(
channel_state,
receive_lockedtransfer,
)
assert is_valid, msg
our_model2 = our_model1
partner_model2 = partner_model1._replace(
distributable=partner_model1.distributable - lock_amount,
amount_locked=lock_amount,
next_nonce=2,
merkletree_leaves=[lock.lockhash],
)
assert_partner_state(channel_state.our_state, channel_state.partner_state, our_model2)
assert_partner_state(channel_state.partner_state, channel_state.our_state, partner_model2)
# Step 2: Simulate learning the secret
# - Registers the secret, this must not change the balance/locked amount
channel.register_secret(channel_state, lock_secret, lock_secrethash)
assert_partner_state(channel_state.our_state, channel_state.partner_state, our_model2)
assert_partner_state(channel_state.partner_state, channel_state.our_state, partner_model2)
# Step 3: Simulate unlocking the lock
# - Update the balances
transferred_amount = 0
message_identifier = random.randint(0, UINT64_MAX)
secret_message = Secret(
message_identifier=message_identifier,
payment_identifier=1,
nonce=2,
channel=channel_state.identifier,
transferred_amount=transferred_amount + lock_amount,
locksroot=EMPTY_MERKLE_ROOT,
secret=lock_secret,
)
secret_message.sign(privkey2, channel_state.partner_state.address)
balance_proof = balanceproof_from_envelope(secret_message)
unlock_state_change = ReceiveUnlock(
lock_secret,
balance_proof,
)
is_valid, msg = channel.handle_unlock(channel_state, unlock_state_change)
assert is_valid, msg
our_model3 = our_model2._replace(
balance=our_model2.balance + lock_amount,
distributable=our_model2.balance + lock_amount,
)
partner_model3 = partner_model2._replace(
balance=partner_model2.balance - lock_amount,
amount_locked=0,
next_nonce=3,
merkletree_leaves=[],
)
assert_partner_state(channel_state.our_state, channel_state.partner_state, our_model3)
assert_partner_state(channel_state.partner_state, channel_state.our_state, partner_model3)
def assert_balance_proof(
token_network_address: TokenNetworkAddress,
app0: App,
app1: App,
saved_state0: SavedState,
saved_state1: SavedState,
) -> None:
"""Assert app0 and app1 agree on the latest balance proof from app0.
Notes:
- The other direction of the channel does not have to be synchronized,
it can be checked with another call.
- It is important to do the validation on a fixed state, that is why
saved_state0 is used.
"""
assert app0.raiden.wal
assert app1.raiden.wal
assert app0.raiden.address == saved_state0.state.our_address
assert app1.raiden.address == saved_state1.state.our_address
channel0 = views.get_channelstate_by_token_network_and_partner(
saved_state0.state, token_network_address, app1.raiden.address)
channel1 = views.get_channelstate_by_token_network_and_partner(
saved_state1.state, token_network_address, app0.raiden.address)
assert channel0
assert channel1
balanceproof0 = cast(BalanceProofUnsignedState,
channel0.our_state.balance_proof)
balanceproof1 = cast(BalanceProofSignedState,
channel1.partner_state.balance_proof)
if balanceproof0 is None:
msg = "Bug detected. The sender does not have a balance proof, but the recipient does."
assert balanceproof1 is None, msg
# nothing to compare
return
# Handle the case when the recipient didn't receive the message yet.
if balanceproof1 is not None:
nonce1 = balanceproof1.nonce
else:
nonce1 = 0
if balanceproof0.nonce < nonce1:
msg = (
"This is a bug, it should never happen. The nonce updates **always** "
"start with the owner of the channel's end. This means for a channel "
"A-B, only A can increase its nonce, same thing with B. At this "
"point, the assertion is failling because this rule was broken, and "
"the partner node has a larger nonce than the sending partner.")
raise AssertionError(msg)
if balanceproof0.nonce > nonce1:
# TODO: Only consider the records up to saved state's state_change_id.
# ATM this has a race condition where this utility could be called
# before the alarm task fetches the corresponding event but while it
# runs it does fetch it.
sent_balance_proof = get_event_with_balance_proof_by_balance_hash(
storage=app0.raiden.wal.storage,
canonical_identifier=balanceproof0.canonical_identifier,
balance_hash=balanceproof0.balance_hash,
recipient=app1.raiden.address,
)
received_balance_proof = get_state_change_with_balance_proof_by_locksroot(
storage=app1.raiden.wal.storage,
canonical_identifier=balanceproof0.canonical_identifier,
locksroot=balanceproof0.locksroot,
sender=app0.raiden.address,
)
if received_balance_proof is not None:
if type(received_balance_proof) == ReceiveTransferRefund:
msg = (
f"Node1 received a refund from node0 and rejected it. This "
f"is likely a Raiden bug. state_change={received_balance_proof}"
)
elif type(received_balance_proof) in (
ActionInitMediator,
ActionInitTarget,
ReceiveUnlock,
ReceiveLockExpired,
):
if type(received_balance_proof) == ReceiveUnlock:
assert isinstance(received_balance_proof,
ReceiveUnlock), MYPY_ANNOTATION
is_valid, _, innermsg = channel.handle_unlock(
channel_state=channel1, unlock=received_balance_proof)
elif type(received_balance_proof) == ReceiveLockExpired:
assert isinstance(received_balance_proof,
ReceiveLockExpired), MYPY_ANNOTATION
is_valid, innermsg, _ = channel.is_valid_lock_expired(
state_change=received_balance_proof,
channel_state=channel1,
sender_state=channel1.partner_state,
receiver_state=channel1.our_state,
block_number=saved_state1.state.block_number,
)
else:
assert isinstance(received_balance_proof,
(ActionInitMediator,
ActionInitTarget)), MYPY_ANNOTATION
is_valid, _, innermsg = channel.handle_receive_lockedtransfer(
channel_state=channel1,
mediated_transfer=received_balance_proof.from_transfer,
)
if not is_valid:
msg = (
f"Node1 received the node0's message but rejected it. This "
f"is likely a Raiden bug. reason={innermsg} "
f"state_change={received_balance_proof}")
else:
msg = (
f"Node1 received the node0's message at that time it "
f"was rejected, this is likely a race condition, node1 "
f"has to process the message again. reason={innermsg} "
f"state_change={received_balance_proof}")
else:
msg = (
f"Node1 received the node0's message but rejected it. This "
f"is likely a Raiden bug. state_change={received_balance_proof}"
)
elif sent_balance_proof is None:
msg = (
"Node0 did not send a message with the latest balanceproof, "
"this is likely a Raiden bug.")
else:
msg = (
"Node0 sent the latest balanceproof but Node1 didn't receive, "
"likely the test is missing proper synchronization amongst the "
"nodes.")
msg = (f"{msg}. "
f"node1={to_checksum_address(app1.raiden.address)} "
f"node0={to_checksum_address(app0.raiden.address)} "
f"state_change_id0={saved_state0.state_change_id} "
f"state_change_id1={saved_state1.state_change_id}.")
raise AssertionError(msg)
is_equal = (balanceproof0.nonce == balanceproof1.nonce
and balanceproof0.transferred_amount
== balanceproof1.transferred_amount
and balanceproof0.locked_amount == balanceproof1.locked_amount
and balanceproof0.locksroot == balanceproof1.locksroot
and balanceproof0.canonical_identifier
== balanceproof1.canonical_identifier
and balanceproof0.balance_hash == balanceproof1.balance_hash)
if not is_equal:
msg = (
f"The balance proof seems corrupted, the recipient has different "
f"values than the sender. "
f"node1={to_checksum_address(app1.raiden.address)} "
f"node0={to_checksum_address(app0.raiden.address)} "
f"state_change_id0={saved_state0.state_change_id} "
f"state_change_id1={saved_state1.state_change_id}.")
raise AssertionError(msg)