[1/?]: multi: add ability to fund+use musig2 channels that commit to a tapscript root #8683
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guggero
changed the title
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I can't approve the PR because I re-opened it. But I reviewed it and worked my feedback directly into the commits. |
In this commit, we rename the files as assembler.go houses the primary interfaces/abstractions of the package. In the rest of the codebase, this file is near uniformly called interface.go, so we rename the file to make the repo more digestible at a scan.
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channeldb/channel.go
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| // to the existing hard-coded fields in the channel's root bucket. | ||
| type chanAuxData struct { | ||
| // revokeKeyLoc is the key locator for the revocation key. | ||
| revokeKeyLoc tlv.RecordT[tlv.TlvType0, keyLocRecord] |
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I think this should have started at 0 originally, but I think now this should start at 1 because of records already in the database?
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Ah, I think in @Roasbeef's original commit it did start at 1 and I thought that was an oversight. But if there's a reason for it, then I'll change it back as I missed that. Thanks!
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I looked at this again and I'm not sure what "records already in the database" you mean? The aux data is only written in putChanInfo() and read in fetchChanInfo() where we first have static entries with ReadElements/WriteElements and then at the end a TLV stream (using the fact that EOF is a valid error when reading a TLV stream).
So there are no existing TLV streams in the chan-info-key sub bucket that things could collide with. Or what am I missing?
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For an existing channel already in the database, revokeKeyLoc will be stored with the tlv type of 1, but chanAuxData will attempt to read it as though the type is 0?
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Oh, of course... Was looking at it from a completely wrong angle, sorry. Totally makes sense, will fix/revert.
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Nice catch, not sure what I was thinking when changing it in the first place...
In this commit, we consolidate the root bucket TLVs into a new struct. This makes it easier to see all the new TLV fields at a glance. We also convert TLV usage to use the new type param based APis.
This'll allow us to create a funding output that uses musig2, but uses a tapscript tweak rather than a normal BIP 86 tweak.
In most cases, we won't yet be passing a root. The option usage helps us keep the control flow mostly unchanged.
This isn't hooked up yet to the funding manager, but with this commit, we can now start to write internal unit tests that handle musig2 channels with a tapscript root.
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.
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Replaces #8546 (with correct base branch and upstream feature branch).
In this PR, we add the initial plumbing that'll allow users to create and use musig2 channels that also commit to a tapscript root. Along the way, we start to store a new optional tapscript root in the
channeldb.OpenChannelstruct within the existing TLV stream appended to the older hard coded byte stream. The musig2 session itself will now conditionally pass in a tapscript root to the key aggregation and signing operations. We've also hooked up the lower half of the funding flow (lnwallet reservations) as well to ensure the new field gets propagated all the way down the relevant call stacks.Link to all PRs in the saga: