AaronFiore/electrum
1
0
Fork 0
Code Activity

Forward HTLCs

Browse Source
This commit is contained in:
ThomasV
2019-02-03 08:00:44 +01:00
parent a975ac1571
commit 43e6e08840
1 changed files with 30 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files

34
electrum/lnbase.py
View File

@@ -1066,11 +1066,37 @@ class Peer(PrintError):
htlc = {'amount_msat': amount_msat_htlc, 'payment_hash':payment_hash, 'cltv_expiry':cltv_expiry}
htlc_id = chan.receive_htlc(htlc)
await self.receive_and_revoke(chan)
# maybe fail htlc
# Forward HTLC
# FIXME: this is not robust to us going offline before payment is fulfilled
if not processed_onion.are_we_final:
# no forwarding for now
reason = OnionRoutingFailureMessage(code=OnionFailureCode.PERMANENT_CHANNEL_FAILURE, data=b'')
await self.fail_htlc(chan, htlc_id, onion_packet, reason)
dph = processed_onion.hop_data.per_hop
next_chan = self.lnworker.get_channel_by_short_id(dph.short_channel_id)
next_peer = self.lnworker.peers[next_chan.node_id]
if next_chan is None or next_chan.get_state() != 'OPEN':
self.print_error("cannot forward htlc", next_chan.get_state() if next_chan else None)
reason = OnionRoutingFailureMessage(code=OnionFailureCode.PERMANENT_CHANNEL_FAILURE, data=b'')
await self.fail_htlc(chan, htlc_id, onion_packet, reason)
return
self.print_error('forwarding htlc to', next_chan.node_id)
next_cltv_expiry = int.from_bytes(dph.outgoing_cltv_value, 'big')
next_amount_msat_htlc = int.from_bytes(dph.amt_to_forward, 'big')
next_htlc = {'amount_msat':next_amount_msat_htlc, 'payment_hash':payment_hash, 'cltv_expiry':next_cltv_expiry}
next_htlc_id = next_chan.add_htlc(next_htlc)
next_peer.send_message(
"update_add_htlc",
channel_id=next_chan.channel_id,
id=next_htlc_id,
cltv_expiry=dph.outgoing_cltv_value,
amount_msat=dph.amt_to_forward,
payment_hash=payment_hash,
onion_routing_packet=processed_onion.next_packet.to_bytes()
)
await next_peer.send_and_revoke(next_chan)
# wait until we get paid
preimage = await next_peer.payment_preimages[payment_hash].get()
# fulfill the original htlc
await self.fulfill_htlc(chan, htlc_id, preimage)
self.print_error("htlc forwarded successfully")
return
try:
preimage, invoice = self.lnworker.get_invoice(payment_hash)