def test_challenge(
channel_manager: ChannelManager,
confirmed_open_channel: Channel,
receiver_address: str,
sender_address: str,
wait_for_blocks,
web3: Web3,
client: Client
):
blockchain = channel_manager.blockchain
channel_id = (confirmed_open_channel.sender, confirmed_open_channel.block)
sig = encode_hex(confirmed_open_channel.create_transfer(5))
channel_manager.register_payment(sender_address, confirmed_open_channel.block, 5, sig)
# hack channel to decrease balance
confirmed_open_channel.update_balance(0)
sig = confirmed_open_channel.create_transfer(3)
block_before = web3.eth.blockNumber
confirmed_open_channel.close()
# should challenge and immediately settle
for waited_blocks in count():
logs = get_logs(client.context.token, 'Transfer', from_block=block_before - 1)
if logs:
break
wait_for_blocks(1)
assert waited_blocks < 10
assert len([l for l in logs
if is_same_address(l['args']['_to'], receiver_address) and
l['args']['_value'] == 5]) == 1
assert len([l for l in logs
if is_same_address(l['args']['_to'], sender_address) and
l['args']['_value'] == 5]) == 1
wait_for_blocks(blockchain.n_confirmations)
gevent.sleep(blockchain.poll_interval)
assert channel_id not in channel_manager.channels
# update channel state so that it will not be closed twice
client.sync_channels()
new_state = None
for channel in client.channels:
if all(channel.sender == confirmed_open_channel.sender,
channel.receiver == confirmed_open_channel.receiver,
channel.block == confirmed_open_channel.block):
new_state = channel.state
if new_state is None:
confirmed_open_channel.state = confirmed_open_channel.State.closed
else:
confirmed_open_channel.state = new_state
def test_challenge(
channel_manager: ChannelManager,
confirmed_open_channel: Channel,
receiver_address: str,
sender_address: str,
wait_for_blocks,
web3: Web3,
client: Client
):
blockchain = channel_manager.blockchain
channel_id = (confirmed_open_channel.sender, confirmed_open_channel.block)
sig = encode_hex(confirmed_open_channel.create_transfer(5))
channel_manager.register_payment(sender_address, confirmed_open_channel.block, 5, sig)
# hack channel to decrease balance
confirmed_open_channel.update_balance(0)
sig = confirmed_open_channel.create_transfer(3)
block_before = web3.eth.blockNumber
confirmed_open_channel.close()
# should challenge and immediately settle
for waited_blocks in count():
logs = get_logs(client.context.token, 'Transfer', from_block=block_before - 1)
if logs:
break
wait_for_blocks(1)
assert waited_blocks < 10
assert len([l for l in logs
if is_same_address(l['args']['_to'], receiver_address) and
l['args']['_value'] == 5]) == 1
assert len([l for l in logs
if is_same_address(l['args']['_to'], sender_address) and
l['args']['_value'] == 5]) == 1
wait_for_blocks(blockchain.n_confirmations)
gevent.sleep(blockchain.poll_interval)
assert channel_id not in channel_manager.channels
# update channel state so that it will not be closed twice
client.sync_channels()
new_state = None
for channel in client.channels:
if all(channel.sender == confirmed_open_channel.sender,
channel.receiver == confirmed_open_channel.receiver,
channel.block == confirmed_open_channel.block):
new_state = channel.state
if new_state is None:
confirmed_open_channel.state = confirmed_open_channel.State.closed
else:
confirmed_open_channel.state = new_state
def sync_channels(self):
"""
Merges locally available channel information, including their current balance signatures,
with channel information available on the blockchain to make up for local data loss.
Naturally, balance signatures cannot be recovered from the blockchain.
"""
filters = {'_sender_address': self.context.address}
create = get_logs(self.context.channel_manager,
'ChannelCreated',
argument_filters=filters,
from_block=start_sync_block,
to_block='latest')
topup = get_logs(self.context.channel_manager,
'ChannelToppedUp',
argument_filters=filters,
from_block=start_sync_block,
to_block='latest')
close = get_logs(self.context.channel_manager,
'ChannelCloseRequested',
argument_filters=filters,
from_block=start_sync_block,
to_block='latest')
settle = get_logs(self.context.channel_manager,
'ChannelSettled',
argument_filters=filters,
from_block=start_sync_block,
to_block='latest')
channel_key_to_channel = {}
def get_channel(event) -> Channel:
sender = to_checksum_address(event['args']['_sender_address'])
receiver = to_checksum_address(event['args']['_receiver_address'])
block = event['args'].get('_open_block_number',
event['blockNumber'])
assert is_same_address(sender, self.context.address)
return channel_key_to_channel.get((sender, receiver, block), None)
for c in self.channels:
channel_key_to_channel[(c.sender, c.receiver, c.block)] = c
for e in create:
c = get_channel(e)
if c:
c.deposit = e['args']['_deposit']
else:
c = Channel(
self.context,
to_checksum_address(e['args']['_sender_address']),
to_checksum_address(e['args']['_receiver_address']),
e['blockNumber'],
e['args']['_deposit'],
on_settle=lambda channel: self.channels.remove(channel))
assert is_same_address(c.sender, self.context.address)
channel_key_to_channel[(c.sender, c.receiver, c.block)] = c
for e in topup:
c = get_channel(e)
c.deposit += e['args']['_added_deposit']
for e in close:
# Requested closed, not actual closed.
c = get_channel(e)
c.update_balance(e['args']['_balance'])
c.state = Channel.State.settling
for e in settle:
c = get_channel(e)
c.state = Channel.State.closed
# Forget closed channels.
self.channels = [
c for c in channel_key_to_channel.values()
if c.state != Channel.State.closed
]
log.debug('Synced a total of {} channels.'.format(len(self.channels)))