feat(wallet)!: use miniscript plan in place of old policy mod
#1786
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We can't easily plan the utxos before all of the assets are known, so having `TxBuilder` try to create `WeightedUtxo`s creates a chicken and egg problem that we fix by moving some logic to `Wallet::create_tx`. `TxParams::utxos` field is thus split into two: `utxos` is a list of outpoints strictly to be used for getting locally owned outputs, and `foreign_utxos` handles adding `WeightedUtxos` coming from `add_foreign_utxo`. These are later combined with the manually selected coins to form the list of utxos that must be spent.
The internal behavior is preserved insofar as the policy path can influence the outcome of tx building. The difference is instead of encode the path as nodes in a policy tree, the plan is determined by the `Assets` available. Note that creating a `Plan` is a pre-requisite to coin selection, so if a UTXO in the wallet can't be planned, it won't be selected. The wallet attempts to create a plan for each UTXO based on the available information. The user may provide additional assets or specify a particular set of assets in order to complete a plan. New APIs include `TxBuilder::add_assets` and `Wallet::try_plan` and `Wallet::planned_utxos`. To prevent confusion due to overlapping functionality, the `TxBuilder` methods `policy_path` and `current_height` are removed.
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This PR integrates features of the miniscript
planmodule into the wallet internals, in particular when it comes to coin selection and tx building. If accepted, the result is that the new interface may eventually replace bdk's currentpolicycode.fixes bitcoindevkit/bdk_wallet#4
Notes to the reviewers
Changelog notice
Checklists
All Submissions:
cargo fmtandcargo clippybefore committingNew Features:
Bugfixes: