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LNPathFinder: cltv delta of first edge in a path should be ignored

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SomberNight 2018-06-18 18:32:06 +02:00
parent cc815c318d
commit 9cbca2a944
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1 changed files with 7 additions and 4 deletions
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11
lib/lnrouter.py
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@ -152,7 +152,8 @@ class LNPathFinder(PrintError):
def __init__(self, channel_db):
self.channel_db = channel_db
def _edge_cost(self, short_channel_id: bytes, start_node: bytes, payment_amt_msat: int) -> float:
def _edge_cost(self, short_channel_id: bytes, start_node: bytes, payment_amt_msat: int,
ignore_cltv=False) -> float:
"""Heuristic cost of going through a channel.
direction: 0 or 1. --- 0 means node_id_1 -> node_id_2
"""
@ -177,7 +178,7 @@ class LNPathFinder(PrintError):
# TODO revise
# paying 10 more satoshis ~ waiting one more block
fee_cost = fee_msat / 1000 / 10
cltv_cost = cltv_expiry_delta
cltv_cost = cltv_expiry_delta if not ignore_cltv else 0
return cltv_cost + fee_cost + 1
@profiler
@ -212,8 +213,10 @@ class LNPathFinder(PrintError):
channel_info = self.channel_db.get_channel_info(edge_channel_id)
node1, node2 = channel_info.node_id_1, channel_info.node_id_2
neighbour = node2 if node1 == cur_node else node1
alt_dist_to_neighbour = distance_from_start[cur_node] \
+ self._edge_cost(edge_channel_id, cur_node, amount_msat)
ignore_cltv_delta_in_edge_cost = cur_node == from_node_id
edge_cost = self._edge_cost(edge_channel_id, cur_node, amount_msat,
ignore_cltv=ignore_cltv_delta_in_edge_cost)
alt_dist_to_neighbour = distance_from_start[cur_node] + edge_cost
if alt_dist_to_neighbour < distance_from_start[neighbour]:
distance_from_start[neighbour] = alt_dist_to_neighbour
prev_node[neighbour] = cur_node, edge_channel_id