When the numTweaks is zero, we should return a nil instead of
initializing an empty map as we'd get the following error,
```
Diff:
--- Expected
+++ Actual
@@ -11007,4 +11007,3 @@
},
- BreachedHtlcTweaks: (contractcourt.htlcTapTweaks) {
- },
+ BreachedHtlcTweaks: (contractcourt.htlcTapTweaks) <nil>,
```
In this commit, we update the channel state machine to use the new
ScriptDescriptor interface. This fixes some subtle issues with the
existing commits, as for p2wsh we always sign the same witness script,
but for p2tr, the witness script differs depending on which branch is
taken.
With the new abstractions, we can treat p2wsh and p2tr as the same
mostly, right up until we need to obtain a control block or a tap tweak.
All tests have been updated accordingly.
In this commit, we update the breach arb to support taproot channels. We
utilize the new taproot briefcase space to store both control blocks,
and also the first+second level scripts for the set of HTLCs.
We pull the information from the sign descriptors and store them in the
resolutions. However, the resolvers created end up duplicating the
resolution data, so we update the sign descs as needed during start up.
In this commit, we add a new taproot specific briefcase to store the
control block and tap tweaks for all taproot outputs. We chose this
route as many of the existing fields are serialized in line, so we
aren't able to serialize this new taproot specific information in the
existing briefcase.
In this commit, we update the chain watcher to be able to generate the
correct pkScript so it can register for confirmation and spend
notifications for taproot channels.
In this commit, we add a new NewCommitState struct. This preps us for
the future change wherein a partial signature is also added to the mix.
All related tests and type signatures have also been updated
accordingly.
In this commit, we extract the musig2 session management into a new
module. This allows us to re-use the session logic elsewhere in unit
tests so we don't need to instantiate the entire wallet.
This commit changes the name returned from `prepContractResolutions`
from `htlcResolvers` to `resolvers` to avoid confusion as there are
multiple types of resolvers returned.
Add a test where the channel arbitrator starts up correctly
when a prior unilateral close of a channel did not broadcast
for specific reasons.
Also add a test which ensures that when a crib output is
rejected by the bitcoin backend the startup works correctly
for specific errors.
In case the mempool backend signals that our transaction does not
meet fee requirements when publishing it we will continue to
start up now. The transaction will be rebroadcasted in the
background and a specific log message will be printed to let the
user know that he could increase his mempool size to at least
have this transaction in his own mempool.
We know that onion blobs in lightning are _exactly_ 1366 bytes in
lightning, but they are currently expressed as a byte slice in
channeldb's HTLC struct. Blobs are currently serialized as var bytes,
so we can take advantage of this known length and variable length
to add additional data to the inline serialization of our HTLCs, which
are otherwise not easily extensible (without creating a new bucket).
In this commit, we attempt to fix an issue that may lead to force closes due
to small value HTLCs. The sweeper has built in a "negative yield" heuristic
where it won't sweep something that'll result in paying more fees than the
HTLC amount. However for HTLCs, we want to always sweep them, as we don't
cancel back the HTLCs before the outgoing contract is fully resolved.
In the future, we'll start to make more uneconomical decisions about if we
should go to chain at all for small value HTLCs, and also do things like
cancel back early if the HTLC is small and we think we might be contested by
chain fees.
Previously when a block spend is found for the outpoint, our htlc
timeout resolver will do a checkpoint, which implicitly creates a db
record if there isn't one. Now, if the spend is found in mempool,
the resolver will be deleted once the contract is resolved. Later on
when the spend is found in the block again, the resolver will be created
again, but never gets resolved this time.
This commit extends the current htlc timeout resolver to also watch for
preimage spend in mempool for a full node backend.
If mempool enabled, the resolver will watch the spend of the htlc output
in mempool and blocks **concurrently**, as if they are independent.
Ideally, a transaction will first appear in mempool then in a block.
However, there's no guarantee it will appear in **our** mempool since
there's no global mempool, thus we need to watch the spend in two places
in case it doesn't go through our mempool.
The current design favors the spend event found in blocks, that is, when
the tx is confirmed, we'd abort the monitoring and conitnue since the
outpoint cannot be double spent and re-appear in mempool again. This is
not true in the rare case of reorg, and we will handle reorg seperately.
This commit adds a new build tag `integration` and removes the old tag
`rpctest` for clarity. Multiple unnecessary usages of `build !rpctest`
is also removed.
Now that we have the new package `lnd/channeldb/models` we can invert the
depenency between `channeldb` and `invoices`.
- Move all the invoice related types and errors to the
`invoices` package.
- Ensure that all the packages dealing with invoices use the types and
interfaces defined in the `invoices` package.
- Implement the InvoiceDB interface (defined in `lnd/invoices`) in
channeldb.
- Add new mock for InterfaceDB.
- `InvoiceRegistery` tests are now in its own subpacakge (they need to
import both invoices & channeldb). This is temporary until we can
decouple them.
Add a new subpackage to `lnd/channeldb` to hold some of the types that
are used in the package itself and in other packages that should not
depend on `channeldb`.
Only create the sweep tx when the height has reached, otherwise we will
get a broadcast error. Previously it wasn't caught by itest due to the
blocks were mined very fast, so the lock time was always reached.
This introduces a BigSize migration that is used to expand the width
of the ChannelStatus and ChannelType fields. Three channel "types"
are added - ZeroConfBit, ScidAliasChanBit, and ScidAliasFeatureBit.
ScidAliasChanBit denotes that the scid-alias channel type was
negotiated for the channel. ScidAliasFeatureBit denotes that the
scid-alias feature bit was negotiated during the *lifetime* of the
channel. Several helper functions on the OpenChannel struct are
exposed to aid callers from different packages.
The RefreshShortChanID has been renamed to Refresh.
A new function BroadcastHeight is used to guard access to the
mutable FundingBroadcastHeight member. This prevents data races.
