Add forwards-compatibility logic in LocalHTLCFailureReason ser
#4099
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We recently created a `LocalHTLCFailureReason` enum to cover detailed reasons why an HTLC may have failed, in excess of the on-the-wire failure encoding. Sadly, when we did so we introduced a serialization format which isn't particularly conducive to introducing new failure reasons in the future. Luckily, `LocalHTLCFailureReason` already has logic that works for forwards-compatibility - it can be converted to, and from, the on-the-wire error codes. Thus, here, we take advantage of that, writing both the on-the-wire error code as well as a code for the specific case. If we don't recognize the specific case on deserialization, we'll fall back to the default case for the on-the-wire code we've written. We also, of course, include a length-prefixed TLV stream to allow for additional fields in the future. Fixes lightningdevkit#4087
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Additional details and impacted files@@ Coverage Diff @@
## main #4099 +/- ##
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Coverage 88.71% 88.71%
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Files 176 176
Lines 132778 132794 +16
Branches 132778 132794 +16
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+ Hits 117790 117806 +16
+ Misses 12304 12301 -3
- Partials 2684 2687 +3
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wpaulino
approved these changes
Sep 22, 2025
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We recently created a
LocalHTLCFailureReasonenum to cover detailed reasons why an HTLC may have failed, in excess of the on-the-wire failure encoding.Sadly, when we did so we introduced a serialization format which isn't particularly conducive to introducing new failure reasons in the future. Luckily,
LocalHTLCFailureReasonalready has logic that works for forwards-compatibility - it can be converted to, and from, the on-the-wire error codes.Thus, here, we take advantage of that, writing both the on-the-wire error code as well as a code for the specific case. If we don't recognize the specific case on deserialization, we'll fall back to the default case for the on-the-wire code we've written.
We also, of course, include a length-prefixed TLV stream to allow for additional fields in the future.
Fixes #4087