Update to select funding inputs before sending open_channel2 and splice_init and add excess to requests #2924
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If a changeless set of inputs is found, excess funding (if any) will be added to the proposed `fundingAmount`/`fundingContribution` before sending `open_channel2`/`splice_init` respectively. InteractiveTxFunder sets `excess_opt` with the input value in excess of what is needed to achieve the requested target feerate. We assume our peer requires confirmed inputs. In the future we could add a heuristic for this, but it's safer to assume they want confirmed inputs.
Added the `SpliceStatus.SpliceInitiated` state for when `SpliceInit` is received with a valid liquidity request, but the wallet has yet returned funding inputs.
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This is an alternative to PR #2903 which does not assume modifying bitcoind to add excess to a selected output during coin selection (see PR 30080).
When funds are added to a dual funded channel, or spliced into an existing channel, our channel should be credited in their channel balance any excess that is added to the channel over what the user requests. Currently if a changeless solution is found for funding, excess value over what was requested will be treated as waste and used as extra fees.
We introduce a new optional funding contributions parameter to
InteractiveTxBuilder. When set, we will start by processing the passed in funding inputs/outputs instead of usingInteractiveTxFunderto fund the transaction. The call toInteractiveTxFunderis now made before sendingopen_channel2orsplice_initand the results are then passed toInteractiveTxBuilder.This PR builds on PR #2887 - Use final spec values for splicing and should be rebased once the final official splicing code is merged.