AaronFiore/electrum
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Trampoline: if possible, do not add second trampoline for e2e payments.

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This should fix #7967
This commit is contained in:
ThomasV
2022-09-04 09:39:13 +02:00
parent 2c57a8c394
commit 92b21df843
1 changed files with 9 additions and 10 deletions
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19
electrum/trampoline.py
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@@ -97,9 +97,8 @@ def encode_routing_info(r_tags):
return result.tobytes()
def is_legacy_relay(invoice_features, r_tags) -> Tuple[bool, Optional[bytes]]:
"""Returns if we deal with a legacy payment and gives back the possible last
trampoline pubkey.
def is_legacy_relay(invoice_features, r_tags) -> Tuple[bool, List[bytes]]:
"""Returns if we deal with a legacy payment and the list of trampoline pubkeys in the invoice.
"""
invoice_features = LnFeatures(invoice_features)
# trampoline-supporting wallets:
@@ -113,7 +112,7 @@ def is_legacy_relay(invoice_features, r_tags) -> Tuple[bool, Optional[bytes]]:
# Any trampoline node should be able to figure out a path to the receiver and
# we can use an e2e payment.
if not r_tags:
return False, None
return False, []
else:
# - We choose one routing hint at random, and
# use end-to-end trampoline if that node is a trampoline-forwarder (TF).
@@ -123,12 +122,11 @@ def is_legacy_relay(invoice_features, r_tags) -> Tuple[bool, Optional[bytes]]:
# endpoints connected to T1 and T2, and sender only has send-capacity with T1, while
# recipient only has recv-capacity with T2.
singlehop_r_tags = [x for x in r_tags if len(x) == 1]
forwarder_pubkey = random.choice(singlehop_r_tags)[0][0]
if is_hardcoded_trampoline(forwarder_pubkey):
return False, forwarder_pubkey
invoice_trampolines = [x[0][0] for x in singlehop_r_tags if is_hardcoded_trampoline(x[0][0])]
return False, invoice_trampolines
# if trampoline receiving is not supported or the forwarder is not known as a trampoline,
# we send a legacy payment
return True, None
return True, []
def trampoline_policy(
@@ -179,7 +177,7 @@ def create_trampoline_route(
use_two_trampolines: bool
) -> LNPaymentRoute:
# we decide whether to convert to a legacy payment
is_legacy, second_trampoline_pubkey = is_legacy_relay(invoice_features, r_tags)
is_legacy, invoice_trampolines = is_legacy_relay(invoice_features, r_tags)
# we build a route of trampoline hops and extend the route list in place
route = []
@@ -202,7 +200,8 @@ def create_trampoline_route(
route[-1].invoice_features = invoice_features
route[-1].outgoing_node_id = invoice_pubkey
else:
if second_trampoline_pubkey and trampoline_node_id != second_trampoline_pubkey:
if invoice_trampolines and trampoline_node_id not in invoice_trampolines:
second_trampoline_pubkey = random.choice(invoice_trampolines)
extend_trampoline_route(route, trampoline_node_id, second_trampoline_pubkey, trampoline_fee_level)
# final edge (not part of the route if payment is legacy, but eclair requires an encrypted blob)