[wallet] Overhaul TxBuilder internals and externals

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Fixes #251

TxBuilders are now not created directly but are created through the
wallet with `build_tx` and `build_fee_bump`.
The advantages of this realised in this commit are:

1. Normal tx creation and fee bumping use the code internally. The only
difference between normal tx and fee bump is how the builder is created.
2. The TxBuilder now has a refernce to the wallet and can therefore
lookup things as methods are called on it. `add_utxo` now uses this to
look up UTXO deta when it is called (rather than having to do it and
possibly error later on).

To support these changes `get_utxo` and `get_descriptor_for_keychain`
public methods have been added to Wallet. I could have kept them
pub(crate) but they seem like fine APIs to have publicly.

...

This commit is contained in:

LLFourn

2021-01-01 13:35:05 +11:00

parent f74f17e227

commit 7553b905c4

7 changed files with 773 additions and 864 deletions

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src/wallet/mod.rs

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