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.
We might be trying to send an invoice amount that's greater than the size of the channel, but once you factor in the custom channel logic, an actual HTLC can be sent over the channel to pay that larger payment.
As a result, we'll skip over this check if a have a custom HTLC.
With this commit we make sure the first hop custom records aren't lost
on restart/resume of a payment, so we persist it as part of the
PaymentCreationInfo struct.
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`.
- Introduce the field `CustomRecords` to the type `UpdateAddHtlc`.
- Encode and decode the new field into the `ExtraData` field of
the `update_add_htlc` wire message.
Because we restrict custom SCID aliases to be in a specific range, we
export the range start and end values so a user of the RPCs we're going
to add in the next commits can adjust their values to fit within the
range.
With the new RPC calls that we are going to add in the next commits, it
will be possible for users to add (local only, non-gossipped) SCID
aliases for channels. Since those will be in the same range as the ones
given out by RequestAlias, we need to make sure that when we generate a
new one that it doesn't collide with an already existing one.
