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refactor(wallet)!: Make Wallet require a change descriptor

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All `Wallet` constructors are modified to require a change
descriptor, where previously it was optional. Additionally
we enforce uniqueness of the change descriptor to avoid
ambiguity when deriving scripts and ensure the wallet will
always have two distinct keystores.

Notable changes

* Add error DescriptorError::ExternalAndInternalAreTheSame
* Remove error CreateTxError::ChangePolicyDescriptor
* No longer rely on `map_keychain`
This commit is contained in:
valued mammal
2024-03-26 21:57:10 -04:00
parent 8eef350bd0
commit 9d954cf7d2
16 changed files with 393 additions and 341 deletions
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45
crates/wallet/examples/compiler.rs
View File

@@ -32,21 +32,52 @@ use bdk_wallet::{KeychainKind, Wallet};
/// This example demonstrates the interaction between a bdk wallet and miniscript policy.
fn main() -> Result<(), Box<dyn Error>> {
// We start with a generic miniscript policy string
let policy_str = "or(10@thresh(4,pk(029ffbe722b147f3035c87cb1c60b9a5947dd49c774cc31e94773478711a929ac0),pk(025f05815e3a1a8a83bfbb03ce016c9a2ee31066b98f567f6227df1d76ec4bd143),pk(025625f41e4a065efc06d5019cbbd56fe8c07595af1231e7cbc03fafb87ebb71ec),pk(02a27c8b850a00f67da3499b60562673dcf5fdfb82b7e17652a7ac54416812aefd),pk(03e618ec5f384d6e19ca9ebdb8e2119e5bef978285076828ce054e55c4daf473e2)),1@and(older(4209713),thresh(2,pk(03deae92101c790b12653231439f27b8897264125ecb2f46f48278603102573165),pk(033841045a531e1adf9910a6ec279589a90b3b8a904ee64ffd692bd08a8996c1aa),pk(02aebf2d10b040eb936a6f02f44ee82f8b34f5c1ccb20ff3949c2b28206b7c1068))))";
// We start with a miniscript policy string
let policy_str = "or(
10@thresh(4,
pk(029ffbe722b147f3035c87cb1c60b9a5947dd49c774cc31e94773478711a929ac0),pk(025f05815e3a1a8a83bfbb03ce016c9a2ee31066b98f567f6227df1d76ec4bd143),pk(025625f41e4a065efc06d5019cbbd56fe8c07595af1231e7cbc03fafb87ebb71ec),pk(02a27c8b850a00f67da3499b60562673dcf5fdfb82b7e17652a7ac54416812aefd),pk(03e618ec5f384d6e19ca9ebdb8e2119e5bef978285076828ce054e55c4daf473e2)
),1@and(
older(4209713),
thresh(2,
pk(03deae92101c790b12653231439f27b8897264125ecb2f46f48278603102573165),pk(033841045a531e1adf9910a6ec279589a90b3b8a904ee64ffd692bd08a8996c1aa),pk(02aebf2d10b040eb936a6f02f44ee82f8b34f5c1ccb20ff3949c2b28206b7c1068)
)
)
)"
.replace(&[' ', '\n', '\t'][..], "");
println!("Compiling policy: \n{}", policy_str);
// Parse the string as a [`Concrete`] type miniscript policy.
let policy = Concrete::<String>::from_str(policy_str)?;
let policy = Concrete::<String>::from_str(&policy_str)?;
// Create a `wsh` type descriptor from the policy.
// `policy.compile()` returns the resulting miniscript from the policy.
let descriptor = Descriptor::new_wsh(policy.compile()?)?;
let descriptor = Descriptor::new_wsh(policy.compile()?)?.to_string();
println!("Compiled into following Descriptor: \n{}", descriptor);
println!("Compiled into Descriptor: \n{}", descriptor);
// Create a new wallet from this descriptor
let mut wallet = Wallet::new_no_persist(&format!("{}", descriptor), None, Network::Regtest)?;
// Do the same for another (internal) keychain
let policy_str = "or(
10@thresh(2,
pk(029ffbe722b147f3035c87cb1c60b9a5947dd49c774cc31e94773478711a929ac0),pk(025f05815e3a1a8a83bfbb03ce016c9a2ee31066b98f567f6227df1d76ec4bd143),pk(025625f41e4a065efc06d5019cbbd56fe8c07595af1231e7cbc03fafb87ebb71ec)
),1@and(
pk(03deae92101c790b12653231439f27b8897264125ecb2f46f48278603102573165),
older(12960)
)
)"
.replace(&[' ', '\n', '\t'][..], "");
println!("Compiling internal policy: \n{}", policy_str);
let policy = Concrete::<String>::from_str(&policy_str)?;
let internal_descriptor = Descriptor::new_wsh(policy.compile()?)?.to_string();
println!(
"Compiled into internal Descriptor: \n{}",
internal_descriptor
);
// Create a new wallet from descriptors
let mut wallet = Wallet::new_no_persist(&descriptor, &internal_descriptor, Network::Regtest)?;
println!(
"First derived address from the descriptor: \n{}",