Reduce our stated max closing-transaction fee to be the true value #1072
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When communicating the maximum fee we're willing to accept on a cooperative closing transaction to our peer, we currently tell them we'll accept `u64::max_value()` if they're the ones who have to pay it. Spec-wise this is fine - they aren't allowed to try to claim our balance, and we don't care how much of their own funds they want to spend on transaction fees. However, the Eclair folks prefer to check all values on the wire do not exceed 21 million BTC, which seems like generally good practice to avoid overflows and such issues. Thus, our close messages are rejected by Eclair. Here we simply relax our stated maximum to be the real value - our counterparty's current balance in satoshis. Fixes lightningdevkit#1071
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Codecov Report
@@ Coverage Diff @@
## main #1072 +/- ##
==========================================
+ Coverage 90.87% 91.40% +0.53%
==========================================
Files 65 65
Lines 33229 35185 +1956
==========================================
+ Hits 30196 32162 +1966
+ Misses 3033 3023 -10
Continue to review full report at Codecov.
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ariard
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Sep 10, 2021
valentinewallace
approved these changes
Sep 11, 2021
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When communicating the maximum fee we're willing to accept on a
cooperative closing transaction to our peer, we currently tell them
we'll accept
u64::max_value()if they're the ones who have to payit. Spec-wise this is fine - they aren't allowed to try to claim
our balance, and we don't care how much of their own funds they
want to spend on transaction fees.
However, the Eclair folks prefer to check all values on the wire
do not exceed 21 million BTC, which seems like generally good
practice to avoid overflows and such issues. Thus, our close
messages are rejected by Eclair.
Here we simply relax our stated maximum to be the real value - our
counterparty's current balance in satoshis.
Fixes #1071