The objective of this commit is to make paymentDescriptor a private
data structure so we can quarantine it to the lnwallet package.
To accomplish this we had to prevent it from leaking out via the
arguments or return values of the public functions in lnwallet.
This naturally had consequences for the htlcswitch package as we
choose other mechanisms for tracking the data that paymentDescriptor
was responsible for.
Astoundingly, this was highly successful and allowed us to remove
a ton of redundant code. The diff for this commit represents a
substantial reduction in total lines of code as well as extraneous
arguments and return values from key functions.
This also sets the stage for future commits where we actually will
be attempting to rid lnwallet of paymentDescriptor completely.
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.
Here we add a function that is capable of recovering LogUpdates from
paymentDescriptors and we refactor the lnwallet code to use this
rather than doing JIT inline construction of the LogUpdates.
In this commit we track the ChannelID on the PaymentDescriptor.
This will be useful in upcoming commits that need to be able to
reconstruct lnwire.Message values from PaymentDescriptors as the
Messages that are exchanged to update channel state all include
the ChannelID.
In this commit we introduce a convenience method to LightningChannel
to allow us to quickly grab the channel id. This will be important
in upcoming commits where we need to remember the ChannelID to
reconstruct update messages.
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 is yet another commit that packs a symmetric structure into
a Dual. This is the last one needed for the time being to consolidate
Num{X}UpdatesPendingOn{Y} functions into a single one.
This commit, like the last one packs the update logs into a symmetric
Dual structure. This will allow us to index into them more concisely
in higher order logic.
This commit packs the LightningChannel's localCommitmentChain and
remoteCommitmentChain into a Dual structure for better symmetric
access. This will be leveraged by an upcoming commit where we want
to more concisely express how we compute the number of pending
updates.
In this commit, we start to thread thru the new aux tap leaf structures to all relevant areas. This includes: commitment outputs, resolution creation, breach handling, and also HTLC scripts.
In this commit, we add a TLV blob to the PaymentDescriptor struct. We also now thread through this value from the UpdateAddHTLC message to the PaymentDescriptor mapping, and the other way around.
In this commit, we add a new AuxLeafStore which can be used to dynamically fetch the latest aux leaves for a given state. This is useful for custom channel types that will store some extra information in the form of a custom blob, then will use that information to derive the new leaf tapscript leaves that may be attached to reach state.
In this commit, we also add the custom TLV blob to the internal commitment struct that we use within the in-memory commitment linked list.
This'll be useful to ensure that we're tracking the current blob for our in memory commitment for when we need to write it to disk.
In this commit, we update all the taproot scripts to also accept an
optional aux leaf. This aux leaf can be used to add more redemption
paths for advanced channels, or just as an extra commitment space.
With this commit, the channel is now aware of if it's a musig2 channel, that also has a tapscript root. We'll need to always pass in the tapscript root each time we: make the funding output, sign a new state, and also verify a new state.
In this commit, we fix an existing bug with the taproot channel type
that can cause force closes if a peer disconnects while attempting to
send the commitment signature.
Before this commit, since the `PartialSig` we send is never committed to
disk, the version read wouldn't contain the musig2 partial sig. We never
write these signatures to disk, as each time we make a new session, we
need to generate fresh nonces to avoid nonce-reuse.
Due to the above interaction, if we went to re-send a signature after a
disconnection, the `CommitSig` message we sent wouldn't actually contain
a `PartialSigWithNonce`, causing a protocol error.
This commit fixes the instantiation of the BlindingPoint member of
PaymentDescriptor during the conversion from persisted LogUpdates.
Previously, the blinding point was not set correctly. The test from the
previous commit is also updated to now assert that this behaviour is now
correct.
This commit introduces a new API to return information on which party opened
the channel using the new ChannelParty type. It does not change the underlying
structure of how we store this information.
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.
This commit adds an optional blinding point to payment descriptors and
persists them in our HTLC's extra data. A get/set pattern is used to
populate the ExtraData on our disk representation of the HTLC so that
callers do not need to worry about the underlying storage detail.
