AaronFiore/electrum
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swaps: improve prepayment invoice handling

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This commit is contained in:
f321x
2025-08-20 12:04:44 +02:00
parent da9b921f57
commit 04b0aca878
1 changed files with 7 additions and 2 deletions
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9
electrum/submarine_swaps.py
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@@ -571,7 +571,9 @@ class SwapManager(Logger):
) -> Tuple[SwapData, str, Optional[str]]:
"""creates a hold invoice"""
if prepay:
prepay_amount_sat = self.get_fee_for_txbatcher() * 2
# server requests 2 * the mining fee as instantly settled prepayment so that the mining
# fees of the funding tx and potential timeout refund tx are always covered
prepay_amount_sat = self.mining_fee * 2
invoice_amount_sat = lightning_amount_sat - prepay_amount_sat
else:
invoice_amount_sat = lightning_amount_sat
@@ -593,7 +595,7 @@ class SwapManager(Logger):
_, prepay_invoice = self.lnworker.get_bolt11_invoice(
payment_hash=prepay_hash,
amount_msat=prepay_amount_sat * 1000,
message='Submarine swap mining fees',
message='Submarine swap prepayment',
expiry=300,
fallback_address=None,
channels=channels,
@@ -978,6 +980,9 @@ class SwapManager(Logger):
# check that the lightning amount is what we requested
if fee_invoice:
fee_lnaddr = self.lnworker._check_bolt11_invoice(fee_invoice)
if fee_lnaddr.get_amount_sat() > self.mining_fee * 2:
raise SwapServerError(_("Mining fee requested by swap-server larger "
"than what was announced in their offer."))
invoice_amount += fee_lnaddr.get_amount_sat()
prepay_hash = fee_lnaddr.paymenthash
else: