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Introduce RenegotiatedFundingLocked monitor update variant #3894

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This is a new ChannelMonitorUpdateStep variant intended to be used whenever a new funding transaction that was negotiated and applied via the RenegotiatedFunding update reaches its intended confirmation depth and both sides of the channel exchange channel_ready/splice_locked. This commit primarily focuses on its use for splices, but future work will expand where needed to support RBFs for a dual funded channel.

This monitor update ensures that the monitor can safely drop all prior commitment data since it is now considered invalid/unnecessary. Once the update is applied, only state for the new funding transaction is tracked going forward, until the monitor receives another RenegotiatedFunding update.

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@wpaulino wpaulino force-pushed the renegotiated-funding-locked-monitor-update branch 2 times, most recently from 00e8bb3 to c1ead6a Compare July 9, 2025 23:25
@wpaulino wpaulino requested a review from jkczyz July 9, 2025 23:26
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codecov bot commented Jul 10, 2025

Codecov Report

Attention: Patch coverage is 62.62626% with 37 lines in your changes missing coverage. Please review.

Project coverage is 88.97%. Comparing base (c48e0a8) to head (a6d4b1e).
Report is 99 commits behind head on main.

Files with missing lines Patch % Lines
lightning/src/chain/channelmonitor.rs 6.25% 29 Missing and 1 partial ⚠️
lightning/src/chain/onchaintx.rs 0.00% 6 Missing ⚠️
lightning/src/ln/channel.rs 97.22% 0 Missing and 1 partial ⚠️
Additional details and impacted files
@@            Coverage Diff             @@
##             main    #3894      +/-   ##
==========================================
- Coverage   89.65%   88.97%   -0.69%     
==========================================
  Files         164      166       +2     
  Lines      134658   119725   -14933     
  Branches   134658   119725   -14933     
==========================================
- Hits       120734   106520   -14214     
+ Misses      11246    10781     -465     
+ Partials     2678     2424     -254     
Flag Coverage Δ
fuzz 22.42% <27.27%> (?)

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This is a new `ChannelMonitorUpdateStep` variant intended to be used
whenever a new funding transaction that was negotiated and applied via
the `RenegotiatedFunding` update reaches its intended confirmation depth
and both sides of the channel exchange `channel_ready`/`splice_locked`.
This commit primarily focuses on its use for splices, but future work
will expand where needed to support RBFs for a dual funded channel.

This monitor update ensures that the monitor can safely drop all prior
commitment data since it is now considered invalid/unnecessary. Once the
update is applied, only state for the new funding transaction is tracked
going forward, until the monitor receives another `RenegotiatedFunding`
update.
@wpaulino wpaulino force-pushed the renegotiated-funding-locked-monitor-update branch from c1ead6a to a6d4b1e Compare July 14, 2025 18:33
@wpaulino wpaulino requested review from jkczyz and TheBlueMatt July 14, 2025 18:33
self.funding.prev_holder_commitment_tx.clone(),
);

for funding in self.pending_funding.drain(..) {
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Might be worth noting that the swap above allows us to clean up both the previous funding and any pending RBFs.

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