Now that the HTLC second-level transactions are going through the
sweeper instead of the nursery, there are a few things we must account
for.
1. The sweeper sweeps the CSV locked HTLC output one block earlier than
the nursery.
2. The sweeper aggregates several HTLC second levels into one
transaction. This also means it is not enough to check txids of the
transactions spent by the final sweep, but we must use the actual
outpoint to distinguish.
In case of anchor channel types, we mine one less block before we expect
the second level sweep to appear in the mempool, since the sweeper
sweeps one block earlier than the nursery.
This commit moves the logic for sweeping the confirmed second-level
timeout transaction into its own method.
We do a small change to the logic: When setting the spending tx in the
report, we use the detected commitspend instead of the presigned tiemout
tx. This is to prepare for the coming change where the spending
transaction might actually be a re-signed timeout tx, and will therefore
have a different txid.
success tx
This commit makes the HTLC resolutions having non-nil SignDetails
(meaning we can re-sign the second-level transactions) go through the
sweeper. They will be offered to the sweeper which will cluster them and
arrange them on its sweep transaction. When that is done we will further
sweep the output on this sweep transaction as any other second-level tx.
In this commit we do this for the HTLC success resolver and the
accompanying HTLC success transaction.
To make the linter happy, make a pointer to the inner resolver.
Otherwise the linter would complain with
copylocks: literal copies lock value
since we'll add a mutex to the resolver in following commits.
Since the tests set a quite high fee rate before the node goes to chain,
the HTLCs wouldn't be economical to sweep at this fee rate.
Pre sweeper handling of the second-level transactions this was not a
problem, since the fees were set when the second-levels were created,
before the fee estimate was increased.
We risked deadlocking on shutdown if a client (in our case a contract
resolver) attempted to schedule a sweep of an input after the
ChainNotifier had been shut down. This would cause the `collector`
goroutine to exit, and not handle incoming requests, causing a deadlock
(since the ChainArbitrator is being stopped before the Sweeper in the
server).
To fix this we could change the order these subsystems are stopped, but
this doesn't ensure there aren't other clients that could end up in the
same deadlock scenario. So instead we keep handling the incoming
requests even after the collector has exited (immediatly returning an
error), until the sweeper is signalled to shutdown.
This commit unsets option static remote key required for peers that
we have existing legacy channels with. This ensures that we can still
connect to peers that do not recognize this feature bit that we have
existing channels with.
