def test_reorg(
web3: Web3,
channel_manager: ChannelManager,
client: Client,
receiver_address: str,
wait_for_blocks,
use_tester: bool
):
if not use_tester:
pytest.skip('Chain reorg tests only work in tester chain')
wait_for_blocks(10)
# create unconfirmed channel
channel_manager.wait_sync()
snapshot_id = web3.testing.snapshot()
channel = client.open_channel(receiver_address, 10)
wait_for_blocks(0)
assert (channel.sender, channel.block) in channel_manager.unconfirmed_channels
# remove unconfirmed channel opening with reorg
web3.testing.revert(snapshot_id)
snapshot_id = web3.testing.snapshot()
wait_for_blocks(0)
assert (channel.sender, channel.block) not in channel_manager.unconfirmed_channels
web3.testing.mine(channel_manager.n_confirmations)
assert (channel.sender, channel.block) not in channel_manager.channels
# leave confirmed channel opening
web3.testing.revert(snapshot_id)
channel = client.open_channel(receiver_address, 10)
wait_for_blocks(channel_manager.n_confirmations)
assert (channel.sender, channel.block) in channel_manager.channels
confirmed_snapshot_id = web3.testing.snapshot()
wait_for_blocks(3)
web3.testing.revert(confirmed_snapshot_id)
assert (channel.sender, channel.block) in channel_manager.channels
# remove unconfirmed topup
channel = client.open_channel(receiver_address, 10)
wait_for_blocks(channel_manager.n_confirmations)
assert (channel.sender, channel.block) in channel_manager.channels
topup_snapshot_id = web3.testing.snapshot()
channel.topup(5)
wait_for_blocks(0)
channel_rec = channel_manager.channels[channel.sender, channel.block]
assert len(channel_rec.unconfirmed_topups) == 1
web3.testing.revert(topup_snapshot_id)
wait_for_blocks(0)
assert (channel.sender, channel.block) in channel_manager.channels
channel_rec = channel_manager.channels[channel.sender, channel.block]
assert len(channel_rec.unconfirmed_topups) == 0
def test_reorg(
web3: Web3,
channel_manager: ChannelManager,
client: Client,
receiver_address: str,
wait_for_blocks,
use_tester: bool
):
if not use_tester:
pytest.skip('Chain reorg tests only work in tester chain')
wait_for_blocks(10)
# create unconfirmed channel
channel_manager.wait_sync()
snapshot_id = web3.testing.snapshot()
channel = client.open_channel(receiver_address, 10)
wait_for_blocks(0)
assert (channel.sender, channel.block) in channel_manager.unconfirmed_channels
# remove unconfirmed channel opening with reorg
web3.testing.revert(snapshot_id)
snapshot_id = web3.testing.snapshot()
wait_for_blocks(0)
assert (channel.sender, channel.block) not in channel_manager.unconfirmed_channels
web3.testing.mine(channel_manager.n_confirmations)
assert (channel.sender, channel.block) not in channel_manager.channels
# leave confirmed channel opening
web3.testing.revert(snapshot_id)
channel = client.open_channel(receiver_address, 10)
wait_for_blocks(channel_manager.n_confirmations)
assert (channel.sender, channel.block) in channel_manager.channels
confirmed_snapshot_id = web3.testing.snapshot()
wait_for_blocks(3)
web3.testing.revert(confirmed_snapshot_id)
assert (channel.sender, channel.block) in channel_manager.channels
# remove unconfirmed topup
channel = client.open_channel(receiver_address, 10)
wait_for_blocks(channel_manager.n_confirmations)
assert (channel.sender, channel.block) in channel_manager.channels
topup_snapshot_id = web3.testing.snapshot()
channel.topup(5)
wait_for_blocks(0)
channel_rec = channel_manager.channels[channel.sender, channel.block]
assert len(channel_rec.unconfirmed_topups) == 1
web3.testing.revert(topup_snapshot_id)
wait_for_blocks(0)
assert (channel.sender, channel.block) in channel_manager.channels
channel_rec = channel_manager.channels[channel.sender, channel.block]
assert len(channel_rec.unconfirmed_topups) == 0
def test_withdraw_above_minimum(
client: Client,
channel_manager: ChannelManager,
web3: Web3,
wait_for_blocks
):
sender = client.context.address
receiver = channel_manager.receiver
channel = client.open_channel(receiver, 10)
wait_for_blocks(channel_manager.n_confirmations + 1)
channel_manager.register_payment(sender, channel.block, 4,
encode_hex(channel.create_transfer(4)))
channel_manager.stop() # don't update state from this point on
channel_manager.join()
state = channel_manager.state
tx_count_before = web3.eth.getTransactionCount(receiver)
withdraw_from_channels(
channel_manager.private_key,
state,
channel_manager.channel_manager_contract,
3,
wait=lambda: wait_for_blocks(1)
)
tx_count_after = web3.eth.getTransactionCount(receiver)
assert tx_count_after == tx_count_before + 1
channel_id = (channel.sender, channel.receiver, channel.block)
channel_info = channel_manager.channel_manager_contract.call().getChannelInfo(*channel_id)
_, deposit, settle_block_number, closing_balance, transferred_tokens = channel_info
assert transferred_tokens == 4
wait_for_blocks(1)
def test_open_channel_insufficient_tokens(client: Client, web3: Web3, receiver_address: str):
balance_of = client.context.token.call().balanceOf(client.context.address)
tx_count_pre = web3.eth.getTransactionCount(client.context.address)
channel = client.open_channel(receiver_address, balance_of + 1)
tx_count_post = web3.eth.getTransactionCount(client.context.address)
assert channel is None
assert tx_count_post == tx_count_pre
def test_close_valid_close(client: Client, channel_manager: ChannelManager,
web3: Web3, wait_for_blocks):
sender = client.context.address
receiver = channel_manager.receiver
channel = client.open_channel(receiver, 10)
wait_for_blocks(channel_manager.n_confirmations + 1)
channel_manager.register_payment(sender, channel.block, 2,
encode_hex(channel.create_transfer(2)))
channel.close()
channel_manager.stop() # don't update state from this point on
channel_manager.join()
state = channel_manager.state
tx_count_before = web3.eth.getTransactionCount(receiver)
close_open_channels(channel_manager.private_key,
state,
channel_manager.channel_manager_contract,
wait=lambda: wait_for_blocks(1))
tx_count_after = web3.eth.getTransactionCount(receiver)
assert tx_count_after == tx_count_before + 1
with pytest.raises((BadFunctionCallOutput, TransactionFailed)):
channel_id = (channel.sender, channel.receiver, channel.block)
channel_manager.channel_manager_contract.call().getChannelInfo(
*channel_id)
wait_for_blocks(1)
def test_close_settled(client: Client, channel_manager: ChannelManager,
web3: Web3, wait_for_blocks):
sender = client.context.address
receiver = channel_manager.receiver
channel = client.open_channel(receiver, 10)
wait_for_blocks(channel_manager.n_confirmations + 1)
channel_manager.register_payment(sender, channel.block, 2,
encode_hex(channel.create_transfer(2)))
receiver_sig = channel_manager.sign_close(sender, channel.block, 2)
channel.close_cooperatively(receiver_sig)
wait_for_blocks(channel_manager.n_confirmations + 1)
channel_manager.stop() # don't update state from this point on
channel_manager.join()
state = channel_manager.state
tx_count_before = web3.eth.getTransactionCount(receiver)
close_open_channels(channel_manager.private_key,
state,
channel_manager.channel_manager_contract,
wait=lambda: wait_for_blocks(1))
tx_count_after = web3.eth.getTransactionCount(receiver)
assert tx_count_after == tx_count_before
wait_for_blocks(1)
def test_channel_opening(client: Client, web3: Web3, make_account,
private_keys: List[str], channel_manager_contract,
token_contract, mine_sync_event, wait_for_blocks,
use_tester, state_db_path):
receiver1_privkey = make_account(RECEIVER_ETH_ALLOWANCE,
RECEIVER_TOKEN_ALLOWANCE, private_keys[2])
receiver2_privkey = make_account(RECEIVER_ETH_ALLOWANCE,
RECEIVER_TOKEN_ALLOWANCE, private_keys[3])
receiver_address = privkey_to_addr(receiver1_privkey)
# make sure channel_manager1 is terminated properly, otherwise Blockchain will be running
# in the background, ruining other tests' results
channel_manager1 = ChannelManager(web3,
channel_manager_contract,
token_contract,
receiver1_privkey,
n_confirmations=5,
state_filename=state_db_path)
start_channel_manager(channel_manager1, use_tester, mine_sync_event)
channel_manager2 = ChannelManager(web3,
channel_manager_contract,
token_contract,
receiver2_privkey,
n_confirmations=5,
state_filename=state_db_path)
start_channel_manager(channel_manager2, use_tester, mine_sync_event)
channel_manager1.wait_sync()
channel_manager2.wait_sync()
blockchain = channel_manager1.blockchain
channel = client.open_channel(receiver_address, 10)
# should be in unconfirmed channels
wait_for_blocks(1)
gevent.sleep(blockchain.poll_interval)
assert (channel.sender, channel.block) not in channel_manager1.channels
assert (channel.sender,
channel.block) in channel_manager1.unconfirmed_channels
channel_rec = channel_manager1.unconfirmed_channels[channel.sender,
channel.block]
assert is_same_address(channel_rec.receiver, receiver_address)
assert is_same_address(channel_rec.sender, channel.sender)
assert channel_rec.mtime == channel_rec.ctime
# should be confirmed after n blocks
wait_for_blocks(blockchain.n_confirmations)
gevent.sleep(blockchain.poll_interval)
assert (channel.sender, channel.block) in channel_manager1.channels
channel_rec = channel_manager1.channels[channel.sender, channel.block]
assert is_same_address(channel_rec.receiver, receiver_address)
assert is_same_address(channel_rec.sender, channel.sender)
assert channel_rec.balance == 0
assert channel_rec.last_signature is None
assert channel_rec.is_closed is False
assert channel_rec.settle_timeout == -1
# should not appear in other channel manager
assert (channel.sender, channel.block) not in channel_manager2.channels
assert (channel.sender,
channel.block) not in channel_manager2.unconfirmed_channels
channel_manager1.stop()
channel_manager2.stop()
def confirmed_open_channel(channel_manager: ChannelManager, client: Client,
receiver_address: str, wait_for_blocks):
channel = client.open_channel(receiver_address, 10)
wait_for_blocks(channel_manager.n_confirmations + 1)
gevent.sleep(channel_manager.blockchain.poll_interval)
assert (channel.sender, channel.block) in channel_manager.channels
return channel
def test_topup_channel_insufficient_tokens(client: Client, web3: Web3,
receiver_address: str):
balance_of = client.token_proxy.contract.call().balanceOf(client.account)
channel = client.open_channel(receiver_address, 1)
tx_count_pre = web3.eth.getTransactionCount(client.account)
assert channel.topup(balance_of) is None
tx_count_post = web3.eth.getTransactionCount(client.account)
assert tx_count_post == tx_count_pre
def confirmed_open_channel(
channel_manager: ChannelManager,
client: Client,
receiver_address: str,
wait_for_blocks
):
channel = client.open_channel(receiver_address, 10)
wait_for_blocks(channel_manager.n_confirmations + 1)
gevent.sleep(channel_manager.blockchain.poll_interval)
assert (channel.sender, channel.block) in channel_manager.channels
return channel
def test_client(client: Client, receiver_address):
"""test if contract calls go through"""
c = client.open_channel(receiver_address, 10)
assert c is not None
sig = c.create_transfer(5)
assert sig is not None
ev = c.topup(10)
assert ev is not None
assert c.deposit == 20
ev = c.close()
assert ev is not None
def test_client(client: Client, receiver_address):
"""test if contract calls go through"""
c = client.open_channel(receiver_address, 10)
assert c is not None
sig = c.create_transfer(5)
assert sig is not None
ev = c.topup(10)
assert ev is not None
assert c.deposit == 20
ev = c.close()
assert ev is not None
def test_unconfirmed_topup(channel_manager: ChannelManager, client: Client,
receiver_address: str, wait_for_blocks):
blockchain = channel_manager.blockchain
channel_manager.wait_sync()
channel = client.open_channel(receiver_address, 10)
wait_for_blocks(1)
gevent.sleep(blockchain.poll_interval)
assert (channel.sender,
channel.block) in channel_manager.unconfirmed_channels
channel.topup(5)
wait_for_blocks(channel_manager.blockchain.n_confirmations)
gevent.sleep(blockchain.poll_interval)
assert (channel.sender, channel.block) in channel_manager.channels
channel_rec = channel_manager.channels[channel.sender, channel.block]
assert channel_rec.deposit == 15
def open_channel(
channel_manager: ChannelManager,
client: Client,
receiver_address: str,
):
channel = client.open_channel(receiver_address, 10)
wait_for_blocks(channel_manager.n_confirmations + 1)
gevent.sleep(channel_manager.blockchain.poll_interval)
time.sleep(30)
#time.sleep(120)
print("channels: ", channel_manager.channels)
print("sender: ", channel.sender)
print("block: ", channel.block)
#assert (channel.sender, channel.block) in channel_manager.channels
return channel
def test_unconfirmed_topup(
channel_manager: ChannelManager,
client: Client,
receiver_address: str,
wait_for_blocks
):
blockchain = channel_manager.blockchain
channel_manager.wait_sync()
channel = client.open_channel(receiver_address, 10)
wait_for_blocks(1)
gevent.sleep(blockchain.poll_interval)
assert (channel.sender, channel.block) in channel_manager.unconfirmed_channels
channel.topup(5)
wait_for_blocks(channel_manager.blockchain.n_confirmations)
gevent.sleep(blockchain.poll_interval)
assert (channel.sender, channel.block) in channel_manager.channels
channel_rec = channel_manager.channels[channel.sender, channel.block]
assert channel_rec.deposit == 15
def test_client(client: Client, receiver_privkey, receiver_address):
"""test if contract calls go through"""
import logging
logging.basicConfig(level=logging.INFO)
c = client.open_channel(receiver_address, 10)
assert c is not None
sig = c.create_transfer(5)
assert sig is not None
ev = c.topup(10)
assert ev is not None
assert c.deposit == 20
ev = c.close()
assert ev is not None
close_channel_cooperatively(c, receiver_privkey)
def test_close_unconfirmed_event(
channel_manager: ChannelManager,
client: Client,
receiver_address: str,
wait_for_blocks
):
channel_manager.wait_sync()
blockchain = channel_manager.blockchain
# if unconfirmed channel is closed it should simply be forgotten
channel = client.open_channel(receiver_address, 10)
wait_for_blocks(1)
gevent.sleep(blockchain.poll_interval)
assert (channel.sender, channel.block) in channel_manager.unconfirmed_channels
assert (channel.sender, channel.block) not in channel_manager.channels
channel.close()
wait_for_blocks(channel_manager.blockchain.n_confirmations) # opening confirmed
gevent.sleep(blockchain.poll_interval)
assert (channel.sender, channel.block) not in channel_manager.unconfirmed_channels
assert (channel.sender, channel.block) in channel_manager.channels
wait_for_blocks(1) # closing confirmed
gevent.sleep(blockchain.poll_interval)
assert (channel.sender, channel.block) not in channel_manager.unconfirmed_channels
assert (channel.sender, channel.block) in channel_manager.channels
def test_close_unconfirmed_event(
channel_manager: ChannelManager,
client: Client,
receiver_address: str,
wait_for_blocks
):
channel_manager.wait_sync()
blockchain = channel_manager.blockchain
# if unconfirmed channel is closed it should simply be forgotten
channel = client.open_channel(receiver_address, 10)
wait_for_blocks(1)
gevent.sleep(blockchain.poll_interval)
assert (channel.sender, channel.block) in channel_manager.unconfirmed_channels
assert (channel.sender, channel.block) not in channel_manager.channels
channel.close()
wait_for_blocks(channel_manager.blockchain.n_confirmations) # opening confirmed
gevent.sleep(blockchain.poll_interval)
assert (channel.sender, channel.block) not in channel_manager.unconfirmed_channels
assert (channel.sender, channel.block) in channel_manager.channels
wait_for_blocks(1) # closing confirmed
gevent.sleep(blockchain.poll_interval)
assert (channel.sender, channel.block) not in channel_manager.unconfirmed_channels
assert (channel.sender, channel.block) in channel_manager.channels
def test_different_receivers(
web3: Web3,
make_account,
private_keys: List[str],
channel_manager_contract: Contract,
token_contract: Contract,
mine_sync_event,
client: Client,
sender_address: str,
wait_for_blocks,
use_tester: bool,
state_db_path: str
):
if not use_tester:
pytest.skip('This test takes several hours on real blockchains.')
receiver1_privkey = make_account(
RECEIVER_ETH_ALLOWANCE,
RECEIVER_TOKEN_ALLOWANCE,
private_keys[2]
)
receiver2_privkey = make_account(
RECEIVER_ETH_ALLOWANCE,
RECEIVER_TOKEN_ALLOWANCE,
private_keys[3]
)
receiver1_address = privkey_to_addr(receiver1_privkey)
channel_manager1 = ChannelManager(
web3,
channel_manager_contract,
token_contract,
receiver1_privkey,
n_confirmations=5,
state_filename=state_db_path
)
start_channel_manager(channel_manager1, use_tester, mine_sync_event)
channel_manager2 = ChannelManager(
web3,
channel_manager_contract,
token_contract,
receiver2_privkey,
n_confirmations=5,
state_filename=state_db_path
)
start_channel_manager(channel_manager2, use_tester, mine_sync_event)
channel_manager1.wait_sync()
channel_manager2.wait_sync()
blockchain = channel_manager1.blockchain
assert channel_manager2.blockchain.n_confirmations == blockchain.n_confirmations
assert channel_manager2.blockchain.poll_interval == blockchain.poll_interval
# unconfirmed open
channel = client.open_channel(receiver1_address, 10)
wait_for_blocks(1)
gevent.sleep(blockchain.poll_interval)
assert (sender_address, channel.block) in channel_manager1.unconfirmed_channels
assert (sender_address, channel.block) not in channel_manager2.unconfirmed_channels
# confirmed open
wait_for_blocks(blockchain.n_confirmations)
gevent.sleep(blockchain.poll_interval)
assert (sender_address, channel.block) in channel_manager1.channels
assert (sender_address, channel.block) not in channel_manager2.channels
# unconfirmed topup
channel.topup(5)
wait_for_blocks(1)
gevent.sleep(blockchain.poll_interval)
channel_rec = channel_manager1.channels[sender_address, channel.block]
assert len(channel_rec.unconfirmed_topups) == 1
assert channel_rec.deposit == 10
# confirmed topup
wait_for_blocks(blockchain.n_confirmations)
gevent.sleep(blockchain.poll_interval)
channel_rec = channel_manager1.channels[sender_address, channel.block]
assert len(channel_rec.unconfirmed_topups) == 0
assert channel_rec.deposit == 15
# closing
channel.close()
wait_for_blocks(blockchain.n_confirmations)
gevent.sleep(blockchain.poll_interval)
channel_rec = channel_manager1.channels[sender_address, channel.block]
assert channel_rec.is_closed is True
# settlement
block_before = web3.eth.blockNumber
wait_for_blocks(channel_rec.settle_timeout - block_before)
channel.settle()
wait_for_blocks(blockchain.n_confirmations)
gevent.sleep(blockchain.poll_interval)
assert (sender_address, channel.block) not in channel_manager1.channels
channel_manager1.stop()
channel_manager2.stop()
def test_channel_opening(
client: Client,
web3: Web3,
make_account,
private_keys: List[str],
channel_manager_contract,
token_contract,
mine_sync_event,
wait_for_blocks,
use_tester,
state_db_path
):
receiver1_privkey = make_account(
RECEIVER_ETH_ALLOWANCE,
RECEIVER_TOKEN_ALLOWANCE,
private_keys[2]
)
receiver2_privkey = make_account(
RECEIVER_ETH_ALLOWANCE,
RECEIVER_TOKEN_ALLOWANCE,
private_keys[3]
)
receiver_address = privkey_to_addr(receiver1_privkey)
# make sure channel_manager1 is terminated properly, otherwise Blockchain will be running
# in the background, ruining other tests' results
channel_manager1 = ChannelManager(
web3,
channel_manager_contract,
token_contract,
receiver1_privkey,
n_confirmations=5,
state_filename=state_db_path
)
start_channel_manager(channel_manager1, use_tester, mine_sync_event)
channel_manager2 = ChannelManager(
web3,
channel_manager_contract,
token_contract,
receiver2_privkey,
n_confirmations=5,
state_filename=state_db_path
)
start_channel_manager(channel_manager2, use_tester, mine_sync_event)
channel_manager1.wait_sync()
channel_manager2.wait_sync()
blockchain = channel_manager1.blockchain
channel = client.open_channel(receiver_address, 10)
# should be in unconfirmed channels
wait_for_blocks(1)
gevent.sleep(blockchain.poll_interval)
assert (channel.sender, channel.block) not in channel_manager1.channels
assert (channel.sender, channel.block) in channel_manager1.unconfirmed_channels
channel_rec = channel_manager1.unconfirmed_channels[channel.sender, channel.block]
assert is_same_address(channel_rec.receiver, receiver_address)
assert is_same_address(channel_rec.sender, channel.sender)
assert channel_rec.mtime == channel_rec.ctime
# should be confirmed after n blocks
wait_for_blocks(blockchain.n_confirmations)
gevent.sleep(blockchain.poll_interval)
assert (channel.sender, channel.block) in channel_manager1.channels
channel_rec = channel_manager1.channels[channel.sender, channel.block]
assert is_same_address(channel_rec.receiver, receiver_address)
assert is_same_address(channel_rec.sender, channel.sender)
assert channel_rec.balance == 0
assert channel_rec.last_signature is None
assert channel_rec.is_closed is False
assert channel_rec.settle_timeout == -1
# should not appear in other channel manager
assert (channel.sender, channel.block) not in channel_manager2.channels
assert (channel.sender, channel.block) not in channel_manager2.unconfirmed_channels
channel_manager1.stop()
channel_manager2.stop()
def test_different_receivers(
web3: Web3,
make_account,
channel_manager_contract: Contract,
token_contract: Contract,
mine_sync_event,
client: Client,
sender_address: str,
wait_for_blocks,
use_tester: bool,
state_db_path: str
):
receiver1_privkey = make_account(RECEIVER_ETH_ALLOWANCE, RECEIVER_TOKEN_ALLOWANCE)
receiver2_privkey = make_account(RECEIVER_ETH_ALLOWANCE, RECEIVER_TOKEN_ALLOWANCE)
receiver1_address = privkey_to_addr(receiver1_privkey)
channel_manager1 = ChannelManager(
web3,
channel_manager_contract,
token_contract,
receiver1_privkey,
n_confirmations=5,
state_filename=state_db_path
)
start_channel_manager(channel_manager1, use_tester, mine_sync_event)
channel_manager2 = ChannelManager(
web3,
channel_manager_contract,
token_contract,
receiver2_privkey,
n_confirmations=5,
state_filename=state_db_path
)
start_channel_manager(channel_manager2, use_tester, mine_sync_event)
channel_manager1.wait_sync()
channel_manager2.wait_sync()
blockchain = channel_manager1.blockchain
assert channel_manager2.blockchain.n_confirmations == blockchain.n_confirmations
assert channel_manager2.blockchain.poll_interval == blockchain.poll_interval
# unconfirmed open
channel = client.open_channel(receiver1_address, 10)
wait_for_blocks(1)
gevent.sleep(blockchain.poll_interval)
assert (sender_address, channel.block) in channel_manager1.unconfirmed_channels
assert (sender_address, channel.block) not in channel_manager2.unconfirmed_channels
# confirmed open
wait_for_blocks(blockchain.n_confirmations)
gevent.sleep(blockchain.poll_interval)
assert (sender_address, channel.block) in channel_manager1.channels
assert (sender_address, channel.block) not in channel_manager2.channels
# unconfirmed topup
channel.topup(5)
wait_for_blocks(1)
gevent.sleep(blockchain.poll_interval)
channel_rec = channel_manager1.channels[sender_address, channel.block]
assert len(channel_rec.unconfirmed_topups) == 1
assert channel_rec.deposit == 10
# confirmed topup
wait_for_blocks(blockchain.n_confirmations)
gevent.sleep(blockchain.poll_interval)
channel_rec = channel_manager1.channels[sender_address, channel.block]
assert len(channel_rec.unconfirmed_topups) == 0
assert channel_rec.deposit == 15
# closing
channel.close()
wait_for_blocks(blockchain.n_confirmations)
gevent.sleep(blockchain.poll_interval)
channel_rec = channel_manager1.channels[sender_address, channel.block]
assert channel_rec.is_closed is True
# settlement
block_before = web3.eth.blockNumber
wait_for_blocks(channel_rec.settle_timeout - block_before)
channel.settle()
wait_for_blocks(blockchain.n_confirmations)
gevent.sleep(blockchain.poll_interval)
assert (sender_address, channel.block) not in channel_manager1.channels
channel_manager1.stop()
channel_manager2.stop()
