This is part of a systematic removal of PaymentDescriptor from the public
API of the lnwallet package. This marks the last change needed before we
make the PaymentDescriptor structure private.
This commit extends the forward HTLC intercept response with fields that
can be used in conjunction with a `ResumeModified` action to modify the
intercepted HTLC p2p message.
Introduce `ResumeModified` action to resume standard behavior of a p2p
message with optional modifications as specified by the client during
interception.
- Introduce the field `CustomRecords` to the type `UpdateFulfillHtlc`.
- Encode and decode the new field into the `ExtraData` field of the
`update_fulfill_htlc` wire message.
- Empty `ExtraData` field is set to `nil`.
This commit squashes the below operations for a net result where
we have an expanded capability of assessing pending updates. This
is made possible by packing the components into Duals in the prior
commits. We squash the operations to simplify review.
htlcswitch+lnwallet: rename PendingLocalUpdateCount
lnwallet: complete pending update queries API for LightningChannel
lnwallet+htlcswitch: consolidate NumPendingUpdates using ChannelParty
This commit makes the observation that we can cleanly define the
NumPendingUpdates function using a single expression by taking
advantage of the relevant fields being properly packed into Duals.
This commit breaks the ChannelConstraints structure into two
sub-structures that reflect the fundamental differences in how
these parameters are used. On its face it may not seem necessary,
however the distinction introduced here is relevant for how we
will be implementing the Dynamic Commitments proposal.
With this PR we might call the stop method even when the start
method of a subsystem did not successfully finish therefore we
need to make sure we guard the stop methods for potential panics
if some variables are not initialized in the contructors of the
subsystems.
This commit expands the definition of the dust limit to take into
account commitment fees as well as dust HTLCs. The dust limit is now
known as a fee exposure threshold. Dust HTLCs are fees anyways so it
makes sense to account for commitment fees as well. The link has
been modified slightly to calculate dust. In the future, the switch
dust calculations can be removed.
If a blinded path payload contains a signal that the following hop on
the path is a dummy hop, then we iteratively peel the dummy hops until
the final payload is reached.
We've covered all the logic for building a blinded path to ourselves and
putting that into an invoice - so now we start preparing to actually be
able to recognise the incoming payment as one from a blinded path we
created.
The incoming update_add_htlc will have an `encrypted_recipient_data`
blob for us that we would have put in the original invoice. From this we
extract the PathID which we wrote. We consider this the payment address
and we use this to derive the associated invoice location.
Blinded path payments will not include MPP records, so the payment
address and total payment amount must be gleaned from the pathID and new
totalAmtMsat onion field respectively.
This commit only covers the final hop payload of a hop in a blinded
path. Dummy hops will be handled in the following commit.
We further break up the extracTLVPayload into more modular pieces. The
pieces are structured in such a way as to prepare for extracTLVPayload
being called in a recursive manner from within
`deriveBlindedRouteForwardingInfo` when we add the logic for handling
dummy hops in a later commit. With this refactor, we completey remove
the BlindingKit's DecryptAndValidateFwdInfo method.
In this refactor commit, we extract all the steps from extractTLVPayload
that have to do with parsing the payload from the sender and verifying
the presence of various fields from the sender.
In preparation for calling the TLV payload parsing logic recursively for
when we need to peel dummy hops from an onion, this commit creates a new
extractTLVPayload function. This is a pure refactor.
