In case the funding manager detects that a funding flow is requested
to be executed with the help of a PsbtIntent, the normal channel
negotiation with the remote peer is interrupted, as soon as the
accept_channel message was received. With the remote peer's funding
multisig key and our local key, we can derive the funding output
script and its address. This is enough to start the PSBT funding
and signing process which the user will do externally to the daemon.
Add an optional channel status CloseChannel which will be stored on the
hitsorical channel which is persisted at channel close. This status is
used to set the close initiator for channels that do not complete the
funding flow or we abandon. In follow up commits, this status will be
used to record force and breach closes. The value is written to the
historical channel bucket for diplay over rpc.
To be able to write a new channel backup file for pending channels,
we need to include the channel configuration in the pending channel
notification event.
This commit adds PendingOpenChannel to SubscribeChannelEvents stream in
the gRPC API.
This is useful for keeping track of channel openings that Autopilot does.
It can also be used for the non-initator side of a channel opening to keep
track of channel openings.
In this commit, we update the `OpenChannel` method to observe the new
`funding_shim` field in the main open channel request. If this is
specified, and is a channel point shim, then we'll create a custom
`chanfunding.Assembler` for the wallet to use in place of the regular
funding workflow.
With this commit, the "initiator" of an external funding flow can now
delegate the remainder of the channel funding workflow to lnd.
This commit gets upfront shutdown scripts from openchannel and
acceptchannel wire messages sent from our peer and sets upfront
shutdown scripts in our open and accept channel messages when
the remote peer supports option upfront shutdown and we have
the feature enabled.
In this commit, we start to thread the pending channel ID from wire
protocol all the way down into the reservation context. This change will
allow negotiation to take place _outside_ the protocol that may result
in a particular chanfunding.Assembler being dispatched.
In this commit, we create a new chainfee package, that houses all fee
related functionality used within the codebase. The creation of this new
package furthers our long-term goal of extracting functionality from the
bloated `lnwallet` package into new distinct packages. Additionally,
this new packages resolves a class of import cycle that could arise if a
new package that was imported by something in `lnwallet` wanted to use
the existing fee related functions in the prior `lnwallet` package.
In this commit, we convert the existing `channeldb.ChannelType` type
into a _bit field_. This doesn't require us to change the current
serialization or interpretation or the type as it is, since all the
current defined values us a distinct bit. This PR lays the ground work
for any future changes that may introduce new channel types (like anchor
outputs), and also any changes that may modify the existing invariants
around channels (if we're the initiator, we always have the funding
transaction).
Since the funding flow requires messages to go through, make use of
sync version of SendToPeer. Using the async version we would risk that
the message was dropped and the process would stall (it would properly
continue after a restart though).
In this commit, we use the recently added `chanvalidate` package to
verify channels once they have been confirmed in the funding manager. We
expose a new method on the `LightningWallet` struct: `ValidateChannels`
which calls the new shared 1st party verification code.
After the channel is fully confirmed in the funding manager, we'll now
use this newly exposed method to handle all validation. As a result, we
can remove the existing validation code in the funding manager, and rely
on the new code in isolation.
In this commit, we add a new legacy protocol command line flag:
`committweak`. When set, this forces the node to NOT signal usage of the
new commitment format. This allows us to test that we're able to
properly establish channels with legacy nodes. Within the server, we'll
now gate our signalling of this new feature based on the legacy protocol
config. Finally, when accepting/initiating a new channel funding, we'll
now check both the local and remote global feature bits, only using the
new commitment format if both signal the global feature bit.
This commit fixes a potential issue within the fundingmanager, where
failing to write the channel opening state could cause the channel being
marked open in the DB, but the opening state not being set. On startup
this would cause the channel state machine to not be able to resume.
We fix this by saving the channel opening state _first_. This works
because saving the opening state is idempotent, and in case a channel is
found pending at startup, it will re-register for confirmation
notifications and re-do the process.
Since the advanceFundingState now can handle pending channels, we'll
call it for both pending and non-pending channels, just making sure that
we re-initialize the channel barriers and re-publish the funding tx fro
pending channels.
This commit makes advanceFundingState check whether a channel is still
pending before checking the channel opening state. This lets us call it
directly, without checking whether a channel has confirmed first.
This commit makes the waitForFundingTimeout method synchronous, and
return ErrConfirmationTimeout in case the timeout is reached.
We also simplify the internals by using waitForTimout defined earlier.
This commit defines a new method waitForTimeout, that will be used to
listen for channels timing out. It handles a subset of what is already
handled by waitForFundingWithTimeout, but we want to break that one up
in smaller parts, and waitForTimeout is the first of these.
Since waitForFundingConfirmation is always called in a goroutine, we
make this explicit by requireing the caller to always increment the
waitgroup before calling it.
Similarly to what we did in the previous commit, we move the
responsibility of marking the channel open by calling
handleFundingConfirmation out from waitForFundingWithTimeout to the
caller.
This commit moves the handling of a funding confirmation out of
waitForFundingConfirmation, and instead let the caller handle marking
the channel opened.
This commit moves the opening logic found within
waitForFundingConfirmation into a new method handleFundingConfirmation.
This will make it easier to later break up waitForFundingConfirmation,
and avoid code duplication.
This commit removes the handleFundingConfirmation method, and instead
hands the newly confirmed channel of to advanceFundingState, which will
take the channel through the rest of the channel opening flow.
Since the advanceFundingSigned now can resume a channel from any state,
we resue the logic in handleFundingSigned instead of manually executing
each step of the funding flow.
This commit make the advanceFundingStateMethod synchronous. It will now
query the database for a channel's opening state, and call the method
stateStep until the channel has finished the opening procedure.
This commit extracts the funding state check we do at startup into a new
method advanceFundingState. In later commits we will modify this method
to work for all funding state machine flows, not only on restart.
