def sign_close(self, sender, open_block_number, balance):
"""Sign an agreement for a channel closing."""
assert is_checksum_address(sender)
if (sender, open_block_number) not in self.channels:
raise NoOpenChannel('Channel does not exist or has been closed'
'(sender=%s, open_block_number=%d)' %
(sender, open_block_number))
c = self.channels[sender, open_block_number]
if c.is_closed:
raise NoOpenChannel('Channel closing has been requested already.')
assert balance is not None
if c.last_signature is None:
raise NoBalanceProofReceived('Payment has not been registered.')
if balance != c.balance:
raise InvalidBalanceProof(
'Requested closing balance does not match latest one.')
c.is_closed = True
c.mtime = time.time()
receiver_sig = sign_close(self.private_key, sender, open_block_number,
c.balance,
self.channel_manager_contract.address)
self.state.set_channel(c)
self.log.info(
'signed cooperative closing message (sender %s, block number %s)',
sender, open_block_number)
return receiver_sig
def close_channel(self, sender, open_block_number):
"""Close and settle a channel."""
if not (sender, open_block_number) in self.channels:
self.log.warn(
"attempt to close a non-registered channel (sender=%s open_block=%s"
% (sender, open_block_number))
return
c = self.channels[sender, open_block_number]
if c.last_signature is None:
raise NoBalanceProofReceived(
'Cannot close a channel without a balance proof.')
# send closing tx
tx_params = [
self.state.receiver, open_block_number, c.balance,
decode_hex(c.last_signature)
]
raw_tx = self.contract_proxy.create_signed_transaction(
'close', tx_params)
txid = self.blockchain.web3.eth.sendRawTransaction(raw_tx)
self.log.info('sent channel close(sender %s, block number %s, tx %s)',
sender, open_block_number, txid)
# update local state
c.is_closed = True
c.mtime = time.time()
self.state.store()
def close_channel(self, sender, open_block_number):
"""Close and settle a channel."""
if not (sender, open_block_number) in self.channels:
self.log.warning(
"attempt to close a non-registered channel (sender=%s open_block=%s"
% (sender, open_block_number))
return
c = self.channels[sender, open_block_number]
if c.last_signature is None:
raise NoBalanceProofReceived(
'Cannot close a channel without a balance proof.')
# send closing tx
raw_tx = create_signed_contract_transaction(
self.private_key, self.channel_manager_contract,
'uncooperativeClose', [
self.state.receiver, open_block_number, c.balance,
decode_hex(c.last_signature)
])
# update local state
c.is_closed = True
c.mtime = time.time()
self.state.set_channel(c)
try:
txid = self.blockchain.web3.eth.sendRawTransaction(raw_tx)
self.log.info(
'sent channel close(sender %s, block number %s, tx %s)',
sender, open_block_number, txid)
except InsufficientBalance:
c.state = ChannelState.CLOSE_PENDING
self.state.set_channel(c)
raise