tlnbase: calculate cltv_expiry for onion_packet correctly - electrum - Electrum Bitcoin wallet
HTML git clone https://git.parazyd.org/electrum
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---
DIR commit f6995b99d9741a515347f734835d820102c90d83
DIR parent 6c67ad24f30b5c6ead21b98b2fb5fc228fb703fd
HTML Author: Janus <ysangkok@gmail.com>
Date: Thu, 17 May 2018 18:12:21 +0200
lnbase: calculate cltv_expiry for onion_packet correctly
Diffstat:
M lib/lnbase.py | 14 +++++++++-----
1 file changed, 9 insertions(+), 5 deletions(-)
---
DIR diff --git a/lib/lnbase.py b/lib/lnbase.py
t@@ -1062,7 +1062,7 @@ class Peer(PrintError):
while not is_synced(wallet.network):
await asyncio.sleep(1)
print("sleeping more")
- cltv_expiry = wallet.get_local_height() + chan.remote_config.to_self_delay
+ height = wallet.get_local_height()
assert sat > 0, "sat is not positive"
amount_msat = sat * 1000
t@@ -1087,15 +1087,19 @@ class Peer(PrintError):
route = self.path_finder.create_route_from_path(path, our_pubkey)
hops_data = []
- substract = (len(route))*9
- for route_edge in route:
- hops_data += [OnionHopsDataSingle(OnionPerHop(route_edge.short_channel_id, amount_msat.to_bytes(8, "big"), (cltv_expiry+(len(route))*9-substract).to_bytes(4, "big")))]
- substract -= 9
+ next_hop_cltv_expiry = sum(route_edge.channel_policy.cltv_expiry_delta for route_edge in route[1:])
+ computed_cltv_expiry = height + 9 # TODO use c tag in invoice (min_final_cltv_expiry)
+ print("traversing route")
+ for idx, route_edge in enumerate(route):
+ print("unused delta", route_edge.channel_policy.cltv_expiry_delta)
+ hops_data += [OnionHopsDataSingle(OnionPerHop(route_edge.short_channel_id, amount_msat.to_bytes(8, "big"), computed_cltv_expiry.to_bytes(4, "big")))]
associated_data = payment_hash
self.secret_key = os.urandom(32)
self.node_keys = [x.node_id for x in route]
onion = new_onion_packet(self.node_keys, self.secret_key, hops_data, associated_data)
+ cltv_expiry = height + next_hop_cltv_expiry + 9 # TODO use min_final_cltv_expiry
+
self.send_message(gen_msg("update_add_htlc", channel_id=chan.channel_id, id=chan.local_state.next_htlc_id, cltv_expiry=cltv_expiry, amount_msat=amount_msat, payment_hash=payment_hash, onion_routing_packet=onion.to_bytes()))
their_local_htlc_pubkey = derive_pubkey(chan.remote_config.htlc_basepoint.pubkey, chan.remote_state.next_per_commitment_point)