In this commit, we update new Taproot related TLVs (nonces, partial sig,
sig with nonce, etc). Along the way we were able to get rid of some
boiler plate, but most importantly, we're able to better protect against
API misuse (using a nonce that isn't initialized, etc) with the new
options API. In some areas this introduces a bit of extra boiler plate,
and where applicable I used some new helper functions to help cut down
on the noise.
Note to reviewers: this is done as a single commit, as changing the API
breaks all callers, so if we want things to compile it needs to be in a
wumbo commit.
With this commit we prepare for the lnwallet channel funding logic to be
aware of the config-level coin selection strategy by adding it to the
wallet config.
* funding: remove unused field `newChanBarriers`
This commit removes the occurance of `newChanBarriers` as it's not used
anywhere.
* funding: rename method names to clear the funding flow
Slightly refactored the names so it's easier to see which side is
processing what messages.
* lnwallet: sanity check empty pending channel ID
This commit adds a sanity check to make sure an empty pending channel ID
will not be accepted.
This commit removes the `Litecoin`, `LtcMode` and `LitecoindMode`
members from the main LND `Config` struct. Since only the bitcoin
blockchain is now supported, this commit also deprecates the
`cfg.Bitcoin.Active` config option.
This tests that the funding manager doesn't immediately consider
a coinbase transaction that is also a funding transaction usable
until the maturity has been reached.
In this commit, we carry out a new notion introduced during a recent
spec meeting to use a feature bit plus 100 before the feature has been
finalized in the spec.
We split into the Final and Staging bits.
Otherwise, in the itests (which are mainly based on implicit
negotiation), we won't try to open taproot chans when we actually need
to.
We may want to revisit this however, since it may lock in parties trying
to use the defaults that aren't currently setting the explicit commit
type during funding.
In this commit, we start to set _internally_ a new feature bit in the
channel announcements we generate. As these taproot channels can only be
unadvertised, this will never actually leak to the public network. The
funding manager will then set this field to allow the router to properly
validate these channels.
In this commit, we add support for the new musig2 channel funding flow.
This flow is identical to the existing flow, but not both sides need to
exchange local nonces up front, and then signatures sent are now partial
signatures instead of regular signatures.
The funding manager also gains some new state of the local nonces it
needs to generate in order to send the funding locked message, and also
process the funding locked message from the remote party.
In order to allow the funding manger to generate the nonces that need to
be applied to each channel, then AddNewChannel method has been modified
to accept a set of options that the peer will then use to bind the
nonces to a new channel.
There is a race condition,
- goroutine_1: performing `stateStep` under `channelReadySent`. Once
`receivedChannelReady` returns true, it will mark the channel state as
`addedToRouterGraph`, which will delete the initial forwarding policy
for private channels.
- goroutine_2: performing `handleChannelReady`, which processes the
remote's channelReady message. It will ask brontide to `AddNewChannel`
in the end.
- goroutine_3: performing `handleNewActiveChannel` in brontide, which
will query the initial forwarding policy and fail to find it because
it's already deleted in goroutine_1.
To fix it, we require `receivedChannelReady` to also check that the
channel's barrier signal in the map `handleChannelReadyBarriers` doesn't
exist, as this signal is removed once `handleChannelReady` finishes
adding the channel in brontide.
This commit is a pure code move. We add a new method
`handleChannelReadyReceived` to handle the channel's state change after
the remote's channel ready message is received.
This commit moves the deletion of the initial forwarding policy to the
end of `stateStep` to make sure the router has persisted it to disk
before the deletion.
Because we now send the correct initial forwarding policy to Brontide,
the correct initial values are inserted into the link and we no longer
need to update the link in a later step.
This will allow us to also set the TimeLockDelta and HTLC settings
when creating the channel. We leave the actual implementation of
the RPC and CLI changes to another PR, this is just to make
things more consistent.
Since the actual wallet backends might be different between the wallet
DB and the actual channel state DB, we pass in the correct struct to the
funding manager.
This commit adds a new itest case to check the race condition found in
issue #7401. In order to control the funding manager's state, a new dev
config for the funding manager is introduced to specify a duration we
should hold before processing remote node's channel_ready message.
A new development config, `DevConfig` is introduced in `lncfg` and will
only have effect if built with flag `integration`. This can also be
extended for future integration tests if more dev-only flags are needed.
This commit adds a new interface method, `RemovePendingChannel`, to be
used when the funding flow is failed after calling `AddPendingChannel`
such that the Brontide has the most up-to-date view of the active
channels.
This commit adds a new struct `chanIdentifier` which wraps the pending
channel ID and active channel ID. This struct is then used in
`failFundingFlow` so the channel ID can be access there.
The funding manager has been updated to use `AddPendingChannel`. Note
that we track the pending channel before it's confirmed as the peer may
have a block height in the future(from our view), thus they may start
operating in this channel before we consider it as fully open.
The mocked peers have been updated to implement the new interface method.
Keagan McClelland