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lnpeer: reestablish_channel - don't replay unacked msgs they alrdy have

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e.g. Alice sends upd1, upd2, upd3, commitment_signed, upd4, upd5.
Bob receives all of these; and sends a revoke_and_ack but there is
a disconnect before Alice receives the revoke_and_ack.
During reestablish, if Bob claims to have received the commitment_signed,
Alice must not replay the msgs before that; but she should replay upd4 and upd5.
This commit is contained in:
SomberNight 2019-08-29 12:37:25 +02:00
parent 2583decc64
commit f403735191
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GPG key ID: B33B5F232C6271E9
1 changed files with 14 additions and 2 deletions
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16
electrum/lnpeer.py
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@ -141,7 +141,7 @@ class Peer(Logger):
asyncio.ensure_future(execution_result)
def on_error(self, payload):
self.logger.info(f"error {payload['data'].decode('ascii')}")
self.logger.info(f"on_error: {payload['data'].decode('ascii')}")
chan_id = payload.get("channel_id")
for d in [ self.channel_accepted, self.funding_signed,
self.funding_created, self.channel_reestablished,
@ -753,10 +753,16 @@ class Peer(Logger):
channel_id=chan_id,
next_local_commitment_number=next_local_ctn,
next_remote_revocation_number=oldest_unrevoked_remote_ctn)
self.logger.info(f'channel_reestablish: sent channel_reestablish with '
f'(next_local_ctn={next_local_ctn}, '
f'oldest_unrevoked_remote_ctn={oldest_unrevoked_remote_ctn})')
channel_reestablish_msg = await self.channel_reestablished[chan_id].get()
their_next_local_ctn = int.from_bytes(channel_reestablish_msg["next_local_commitment_number"], 'big')
their_oldest_unrevoked_remote_ctn = int.from_bytes(channel_reestablish_msg["next_remote_revocation_number"], 'big')
self.logger.info(f'channel_reestablish: received channel_reestablish with '
f'(their_next_local_ctn={their_next_local_ctn}, '
f'their_oldest_unrevoked_remote_ctn={their_oldest_unrevoked_remote_ctn})')
their_local_pcp = channel_reestablish_msg.get("my_current_per_commitment_point")
their_claim_of_our_last_per_commitment_secret = channel_reestablish_msg.get("your_last_per_commitment_secret")
# sanity checks of received values
@ -772,10 +778,16 @@ class Peer(Logger):
# e.g. for watchtowers, hence we must ensure these ctxs coincide.
# We replay the local updates even if they were not yet committed.
unacked = chan.hm.get_unacked_local_updates()
self.logger.info(f'replaying {len(unacked)} unacked messages')
n_replayed_msgs = 0
for ctn, messages in unacked.items():
if ctn < their_next_local_ctn:
# They claim to have received these messages and the corresponding
# commitment_signed, hence we must not replay them.
continue
for raw_upd_msg in messages:
self.transport.send_bytes(raw_upd_msg)
n_replayed_msgs += 1
self.logger.info(f'channel_reestablish: replayed {n_replayed_msgs} unacked messages')
should_close_we_are_ahead = False
should_close_they_are_ahead = False