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descriptors: add a helper to get the value of the timelock

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Antoine Poinsot 2022-08-18 11:57:52 +02:00
parent 0fd57db8a8
commit ee86a1bd5e
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1 changed files with 49 additions and 0 deletions
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49
src/descriptors.rs
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@ -335,6 +335,43 @@ impl InheritanceDescriptor {
.expect("All pubkeys are derived, no wildcard.");
DerivedInheritanceDescriptor(desc)
}
/// Get the value (in blocks) of the relative timelock for the heir's spending path.
pub fn timelock_value(&self) -> u32 {
let wsh_desc = match &self.0 {
descriptor::Descriptor::Wsh(desc) => desc,
_ => unreachable!(),
};
let ms = match wsh_desc.as_inner() {
descriptor::WshInner::Ms(ms) => ms,
_ => unreachable!(),
};
let policy = ms
.lift()
.expect("Lifting can't fail on a Miniscript")
.normalized();
let subs = match policy {
SemanticPolicy::Threshold(1, subs) => subs,
_ => unreachable!(),
};
let heir_subs = subs
.iter()
.find_map(|s| match s {
SemanticPolicy::Threshold(2, subs) => Some(subs),
_ => None,
})
.expect("Always present");
let csv = heir_subs
.iter()
.find_map(|s| match s {
SemanticPolicy::Older(csv) => Some(csv),
_ => None,
})
.expect("Always present");
*csv
}
}
impl DerivedInheritanceDescriptor {
@ -391,5 +428,17 @@ mod tests {
);
}
#[test]
fn inheritance_descriptor_tl_value() {
let desc = InheritanceDescriptor::from_str("wsh(andor(pk(tpubDEN9WSToTyy9ZQfaYqSKfmVqmq1VVLNtYfj3Vkqh67et57eJ5sTKZQBkHqSwPUsoSskJeaYnPttHe2VrkCsKA27kUaN9SDc5zhqeLzKa1rr/*),older(1),pk(tpubD8LYfn6njiA2inCoxwM7EuN3cuLVcaHAwLYeups13dpevd3nHLRdK9NdQksWXrhLQVxcUZRpnp5CkJ1FhE61WRAsHxDNAkvGkoQkAeWDYjV/*)))").unwrap();
assert_eq!(desc.timelock_value(), 1);
let desc = InheritanceDescriptor::from_str("wsh(andor(pk(tpubDEN9WSToTyy9ZQfaYqSKfmVqmq1VVLNtYfj3Vkqh67et57eJ5sTKZQBkHqSwPUsoSskJeaYnPttHe2VrkCsKA27kUaN9SDc5zhqeLzKa1rr/*),older(42000),pk(tpubD8LYfn6njiA2inCoxwM7EuN3cuLVcaHAwLYeups13dpevd3nHLRdK9NdQksWXrhLQVxcUZRpnp5CkJ1FhE61WRAsHxDNAkvGkoQkAeWDYjV/*)))").unwrap();
assert_eq!(desc.timelock_value(), 42000);
let desc = InheritanceDescriptor::from_str("wsh(andor(pk(tpubDEN9WSToTyy9ZQfaYqSKfmVqmq1VVLNtYfj3Vkqh67et57eJ5sTKZQBkHqSwPUsoSskJeaYnPttHe2VrkCsKA27kUaN9SDc5zhqeLzKa1rr/*),older(65535),pk(tpubD8LYfn6njiA2inCoxwM7EuN3cuLVcaHAwLYeups13dpevd3nHLRdK9NdQksWXrhLQVxcUZRpnp5CkJ1FhE61WRAsHxDNAkvGkoQkAeWDYjV/*)))").unwrap();
assert_eq!(desc.timelock_value(), 0xffff);
}
// TODO: test error conditions of deserialization.
}