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_calc_routing_hints_for_invoice: incl max 15 chans to avoid qr overflow

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Prioritise channels that are likely to be able to receive the payment.
This commit is contained in:
SomberNight
2021-03-01 21:55:41 +01:00
parent 6f894b9f88
commit 06ea06f7d3
1 changed files with 8 additions and 6 deletions
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14
electrum/lnworker.py
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@@ -1797,15 +1797,17 @@ class LNWallet(LNWorker):
"""calculate routing hints (BOLT-11 'r' field)"""
routing_hints = []
channels = list(self.channels.values())
random.shuffle(channels) # not sure this has any benefit but let's not leak channel order
# do minimal filtering of channels.
# we include channels that cannot *right now* receive (e.g. peer disconnected or balance insufficient)
channels = [chan for chan in channels
if (chan.is_open() and not chan.is_frozen_for_receiving())]
# cap max channels to include to keep QR code reasonably scannable
channels = sorted(channels, key=lambda chan: (not chan.is_active(), -chan.available_to_spend(REMOTE)))
channels = channels[:15]
random.shuffle(channels) # let's not leak channel order
scid_to_my_channels = {chan.short_channel_id: chan for chan in channels
if chan.short_channel_id is not None}
# note: currently we add *all* our channels; but this might be a privacy leak?
for chan in channels:
# do minimal filtering of channels.
# we include channels that cannot *right now* receive (e.g. peer disconnected or balance insufficient)
if not (chan.is_open() and not chan.is_frozen_for_receiving()):
continue
chan_id = chan.short_channel_id
assert isinstance(chan_id, bytes), chan_id
channel_info = get_mychannel_info(chan_id, scid_to_my_channels)