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Extensible Liquidity Ads #2848

Merged
merged 3 commits into from
Sep 24, 2024
Merged

Extensible Liquidity Ads #2848

merged 3 commits into from
Sep 24, 2024

Commits on Sep 24, 2024

  1. Add support for extensible liquidity ads 

    The initiator of `open_channel2`, `tx_init_rbf` and `splice_init` can
request funding from the remote node. The non-initiator node will:

- let the open-channel-interceptor plugin decide whether to provide
  liquidity for new channels or not, and how much
- always honor liquidity requests on existing channels (RBF and splice)
  when funding rates have been configured

Liquidity ads are included in the `node_announcement` message, which
lets buyers compare sellers and connect to sellers that provide rates
they are comfortable with. They are also included in the `init` message
which allows providing different rates to specific peers.

This implements lightning/bolts#1153. We
currently use the temporary tlv tag 1339 while we're waiting for
feedback on the spec proposal.
    @t-bast
    t-bast committed Sep 24, 2024
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  2. Add channelCreationFee to liquidity ads 

    Creating a new channel has an additional cost compared to adding
liquidity to an existing channel: the channel will be closed in the
future, which will require paying on-chain fees. Node operators can
include a `channel-creation-fee-satoshis` in their liquidity ads to
cover some of that future cost.
    @t-bast
    t-bast committed Sep 24, 2024
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  3. Add liquidity purchases to the AuditDb 

    Whenever liquidity is purchased, we store it in the `AuditDb`. This lets
node operators gather useful statistics on their peers, and which ones
are actively using the liquidity that is purchased.

We store minimal information about the liquidity ads itself to be more
easily compatible with potential changes in the spec.
    @t-bast
    t-bast committed Sep 24, 2024
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