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maybe_forward_htlc: catch exceptions raised by nexp_peer. return only error

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This commit is contained in:
ThomasV 2020-03-02 21:18:56 +01:00
parent f801307a08
commit 97d191a121
1 changed files with 36 additions and 35 deletions
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71
electrum/lnpeer.py
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@ -1154,61 +1154,62 @@ class Peer(Logger):
forwarding_enabled = self.network.config.get('lightning_forward_payments', False)
if not forwarding_enabled:
self.logger.info(f"forwarding is disabled. failing htlc.")
reason = OnionRoutingFailureMessage(code=OnionFailureCode.PERMANENT_CHANNEL_FAILURE, data=b'')
return False, False, reason
return OnionRoutingFailureMessage(code=OnionFailureCode.PERMANENT_CHANNEL_FAILURE, data=b'')
dph = processed_onion.hop_data.per_hop
next_chan = self.lnworker.get_channel_by_short_id(dph.short_channel_id)
next_chan_scid = dph.short_channel_id
local_height = self.network.get_local_height()
if next_chan is None:
self.logger.info(f"cannot forward htlc. cannot find next_chan {next_chan_scid}")
reason = OnionRoutingFailureMessage(code=OnionFailureCode.UNKNOWN_NEXT_PEER, data=b'')
return False, False, reason
return OnionRoutingFailureMessage(code=OnionFailureCode.UNKNOWN_NEXT_PEER, data=b'')
outgoing_chan_upd = next_chan.get_outgoing_gossip_channel_update()[2:]
outgoing_chan_upd_len = len(outgoing_chan_upd).to_bytes(2, byteorder="big")
if not next_chan.can_send_update_add_htlc():
self.logger.info(f"cannot forward htlc. next_chan {next_chan_scid} cannot send ctx updates. "
f"chan state {next_chan.get_state()}, peer state: {next_chan.peer_state}")
reason = OnionRoutingFailureMessage(code=OnionFailureCode.TEMPORARY_CHANNEL_FAILURE,
data=outgoing_chan_upd_len+outgoing_chan_upd)
return False, False, reason
data = outgoing_chan_upd_len + outgoing_chan_upd
return OnionRoutingFailureMessage(code=OnionFailureCode.TEMPORARY_CHANNEL_FAILURE, data=data)
next_cltv_expiry = int.from_bytes(dph.outgoing_cltv_value, 'big')
if htlc.cltv_expiry - next_cltv_expiry < NBLOCK_OUR_CLTV_EXPIRY_DELTA:
reason = OnionRoutingFailureMessage(code=OnionFailureCode.INCORRECT_CLTV_EXPIRY,
data=(htlc.cltv_expiry.to_bytes(4, byteorder="big")
+ outgoing_chan_upd_len + outgoing_chan_upd))
return False, False, reason
data = htlc.cltv_expiry.to_bytes(4, byteorder="big") + outgoing_chan_upd_len + outgoing_chan_upd
return OnionRoutingFailureMessage(code=OnionFailureCode.INCORRECT_CLTV_EXPIRY, data=data)
if htlc.cltv_expiry - lnutil.NBLOCK_DEADLINE_BEFORE_EXPIRY_FOR_RECEIVED_HTLCS <= local_height \
or next_cltv_expiry <= local_height:
reason = OnionRoutingFailureMessage(code=OnionFailureCode.EXPIRY_TOO_SOON,
data=outgoing_chan_upd_len+outgoing_chan_upd)
return False, False,reason
data = outgoing_chan_upd_len + outgoing_chan_upd
return OnionRoutingFailureMessage(code=OnionFailureCode.EXPIRY_TOO_SOON, data=data)
if max(htlc.cltv_expiry, next_cltv_expiry) > local_height + lnutil.NBLOCK_CLTV_EXPIRY_TOO_FAR_INTO_FUTURE:
reason = OnionRoutingFailureMessage(code=OnionFailureCode.EXPIRY_TOO_FAR, data=b'')
return False, False, reason
return OnionRoutingFailureMessage(code=OnionFailureCode.EXPIRY_TOO_FAR, data=b'')
next_amount_msat_htlc = int.from_bytes(dph.amt_to_forward, 'big')
forwarding_fees = fee_for_edge_msat(forwarded_amount_msat=next_amount_msat_htlc,
fee_base_msat=lnutil.OUR_FEE_BASE_MSAT,
fee_proportional_millionths=lnutil.OUR_FEE_PROPORTIONAL_MILLIONTHS)
forwarding_fees = fee_for_edge_msat(
forwarded_amount_msat=next_amount_msat_htlc,
fee_base_msat=lnutil.OUR_FEE_BASE_MSAT,
fee_proportional_millionths=lnutil.OUR_FEE_PROPORTIONAL_MILLIONTHS)
if htlc.amount_msat - next_amount_msat_htlc < forwarding_fees:
reason = OnionRoutingFailureMessage(code=OnionFailureCode.FEE_INSUFFICIENT,
data=(next_amount_msat_htlc.to_bytes(8, byteorder="big")
+ outgoing_chan_upd_len + outgoing_chan_upd))
return False, False, reason
data = next_amount_msat_htlc.to_bytes(8, byteorder="big") + outgoing_chan_upd_len + outgoing_chan_upd
return OnionRoutingFailureMessage(code=OnionFailureCode.FEE_INSUFFICIENT, data=data)
self.logger.info(f'forwarding htlc to {next_chan.node_id}')
next_htlc = UpdateAddHtlc(amount_msat=next_amount_msat_htlc, payment_hash=htlc.payment_hash, cltv_expiry=next_cltv_expiry, timestamp=int(time.time()))
next_htlc = UpdateAddHtlc(
amount_msat=next_amount_msat_htlc,
payment_hash=htlc.payment_hash,
cltv_expiry=next_cltv_expiry,
timestamp=int(time.time()))
next_htlc = next_chan.add_htlc(next_htlc)
next_peer = self.lnworker.peers[next_chan.node_id]
next_peer.send_message(
"update_add_htlc",
channel_id=next_chan.channel_id,
id=next_htlc.htlc_id,
cltv_expiry=dph.outgoing_cltv_value,
amount_msat=dph.amt_to_forward,
payment_hash=next_htlc.payment_hash,
onion_routing_packet=processed_onion.next_packet.to_bytes()
)
return next_chan, next_peer, None
try:
next_peer.send_message(
"update_add_htlc",
channel_id=next_chan.channel_id,
id=next_htlc.htlc_id,
cltv_expiry=dph.outgoing_cltv_value,
amount_msat=dph.amt_to_forward,
payment_hash=next_htlc.payment_hash,
onion_routing_packet=processed_onion.next_packet.to_bytes()
)
except BaseException as e:
self.logger.info(f"failed to forward htlc: error sending message. {e}")
data = outgoing_chan_upd_len + outgoing_chan_upd
return OnionRoutingFailureMessage(code=OnionFailureCode.TEMPORARY_CHANNEL_FAILURE, data=data)
return None
def maybe_fulfill_htlc(self, chan: Channel, htlc: UpdateAddHtlc, *,
onion_packet: OnionPacket, processed_onion: ProcessedOnionPacket):
@ -1455,7 +1456,7 @@ class Peer(Logger):
onion_packet=onion_packet,
processed_onion=processed_onion)
elif not forwarded:
next_chan, next_peer, error = self.maybe_forward_htlc(
error = self.maybe_forward_htlc(
chan=chan,
htlc=htlc,
onion_packet=onion_packet,