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on_channel_reestablish: try to get remote to force close channel if out-of-sync.

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see ACINQ/eclair#727 and lightningnetwork/lnd#1904
This commit is contained in:
SomberNight 2018-10-09 17:41:24 +02:00 • committed by ThomasV
parent 1946254ef2
commit 4d32478f30
1 changed files with 30 additions and 11 deletions
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41
electrum/lnbase.py
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@ -792,23 +792,42 @@ class Peer(PrintError):
if not chan:
print("Warning: received unknown channel_reestablish", bh2u(chan_id))
return
def try_to_get_remote_to_force_close_with_their_latest():
self.print_error("trying to get remote to force close", bh2u(chan_id))
self.send_message(gen_msg("channel_reestablish",
channel_id=chan_id,
next_local_commitment_number=0,
next_remote_revocation_number=0
))
channel_reestablish_msg = payload
# compare remote ctns
remote_ctn = int.from_bytes(channel_reestablish_msg["next_local_commitment_number"], 'big')
if remote_ctn != chan.remote_state.ctn + 1:
raise Exception("expected remote ctn {}, got {}".format(chan.remote_state.ctn + 1, remote_ctn))
self.print_error("expected remote ctn {}, got {}".format(chan.remote_state.ctn + 1, remote_ctn))
# TODO iff their ctn is lower than ours, we should force close instead
try_to_get_remote_to_force_close_with_their_latest()
return
# compare local ctns
local_ctn = int.from_bytes(channel_reestablish_msg["next_remote_revocation_number"], 'big')
if local_ctn != chan.local_state.ctn:
raise Exception("expected local ctn {}, got {}".format(chan.local_state.ctn, local_ctn))
try:
their = channel_reestablish_msg["my_current_per_commitment_point"]
except KeyError: # no data_protect option
self.channel_reestablished[chan_id].set_result(True)
self.print_error("expected local ctn {}, got {}".format(chan.local_state.ctn, local_ctn))
# TODO iff their ctn is lower than ours, we should force close instead
try_to_get_remote_to_force_close_with_their_latest()
return
our = chan.remote_state.current_per_commitment_point
if our is None:
our = chan.remote_state.next_per_commitment_point
if our != their:
raise Exception("Remote PCP mismatch: {} {}".format(bh2u(our), bh2u(their)))
# compare per commitment points (needs data_protect option)
their_pcp = channel_reestablish_msg.get("my_current_per_commitment_point", None)
if their_pcp is not None:
our_pcp = chan.remote_state.current_per_commitment_point
if our_pcp is None:
our_pcp = chan.remote_state.next_per_commitment_point
if our_pcp != their_pcp:
self.print_error("Remote PCP mismatch: {} {}".format(bh2u(our_pcp), bh2u(their_pcp)))
# FIXME ...what now?
try_to_get_remote_to_force_close_with_their_latest()
return
# checks done
self.channel_reestablished[chan_id].set_result(True)
def funding_locked(self, chan):