[1/3]: Preparatory work for Forwarding Blinded Routes #8159
Commits on Mar 27, 2024
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lnwire: create common encoder/decoder for raw feature vectors
We'll need to pack feature vectors for route blinding, so we pull the encoding/decoding out into separate functions (currently contained in ChannelType). Though it's more lines of code, we keep most of the ChannelType assertions so that we strictly enforce use of the alias.
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record: add TLV encoding/decoding for blinded route data blobs
This commit adds encoding and decoding for blinded route data blobs. TLV fields such as path_id (which are only used for the final hop) are omitted to minimize the change size.
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multi: add validation of blinded route encrypted data
Co-authored-by: Calvin Zachman <calvin.zachman@protonmail.com>
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lnwire: add blinding point to update_add_htlc TLVs
Add blinding points to update_add_htlc. This TLV will be set for nodes that are relaying payments in blinded routes that are _not_ the introduction node.
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multi: add blinding point to payment descriptor and persist
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.
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htlcswitch: add incoming amount and to decode hop iterator request
When we have payments inside of a blinded route, we need to know the incoming amount to be able to back-calculate the amount that we need to forward using the forwarding parameters provided in the blinded route encrypted data. This commit adds the payment amount to our DecodeHopIteratorRequest so that it can be threaded down to payment forwarding information creation in later commits.
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lnrpc: rename proportional fee rate on lnrpc
This field is incorrectly suffixed as "msat", when it is actually interpreted as the proportional fee rate. This is the value that we should be using because the sender will calculate proportional fees accordingly. This is a breaking change to the RPC, but on an experimental and unreleased API.
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