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Inline checked div functions back into unsigned module 

A while back we move all the 'fee' stuff into a separate module
because I thought it would help with clarity - I was wrong.

Move the checked div functions back into the `unsigned` module on the
main `Amount` impl block.

Internal change only - code move.
This commit is contained in:
Tobin C. Harding 2025-06-12 10:16:29 +10:00
parent aab9c2dfca
commit e17c391a3c
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GPG Key ID: 40BF9E4C269D6607
2 changed files with 101 additions and 102 deletions
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101
units/src/amount/unsigned.rs
View File

@ -15,6 +15,7 @@ use super::{
parse_signed_to_satoshi, split_amount_and_denomination, Denomination, Display, DisplayStyle,
OutOfRangeError, ParseAmountError, ParseError, SignedAmount,
};
use crate::{FeeRate, Weight};
mod encapsulate {
use super::OutOfRangeError;
@ -402,6 +403,106 @@ impl Amount {
SignedAmount::from_sat(self.to_sat() as i64) // Cast ok, signed amount and amount share positive range.
.expect("range of Amount is within range of SignedAmount")
}
/// Checked weight floor division.
///
/// Be aware that integer division loses the remainder if no exact division
/// can be made. See also [`Self::checked_div_by_weight_ceil`].
///
/// Returns [`None`] if overflow occurred.
#[must_use]
pub const fn checked_div_by_weight_floor(self, weight: Weight) -> Option<FeeRate> {
let wu = weight.to_wu();
if wu == 0 {
return None;
}
// Mul by 1,000 because we use per/kwu.
match self.to_sat().checked_mul(1_000) {
Some(sats) => {
let fee_rate = sats / wu;
FeeRate::from_sat_per_kwu(fee_rate)
}
None => None,
}
}
/// Checked weight ceiling division.
///
/// Be aware that integer division loses the remainder if no exact division
/// can be made. This method rounds up ensuring the transaction fee rate is
/// sufficient. See also [`Self::checked_div_by_weight_floor`].
///
/// Returns [`None`] if overflow occurred.
///
/// # Examples
///
/// ```
/// # use bitcoin_units::{amount, Amount, FeeRate, Weight};
/// let amount = Amount::from_sat(10)?;
/// let weight = Weight::from_wu(300);
/// let fee_rate = amount.checked_div_by_weight_ceil(weight);
/// assert_eq!(fee_rate, FeeRate::from_sat_per_kwu(34));
/// # Ok::<_, amount::OutOfRangeError>(())
/// ```
#[must_use]
pub const fn checked_div_by_weight_ceil(self, weight: Weight) -> Option<FeeRate> {
let wu = weight.to_wu();
if wu == 0 {
return None;
}
// Mul by 1,000 because we use per/kwu.
if let Some(sats) = self.to_sat().checked_mul(1_000) {
// No need to used checked arithmetic because wu is non-zero.
if let Some(bump) = sats.checked_add(wu - 1) {
let fee_rate = bump / wu;
return FeeRate::from_sat_per_kwu(fee_rate);
}
}
None
}
/// Checked fee rate floor division.
///
/// Computes the maximum weight that would result in a fee less than or equal to this amount
/// at the given `fee_rate`. Uses floor division to ensure the resulting weight doesn't cause
/// the fee to exceed the amount.
///
/// Returns [`None`] if overflow occurred or if `fee_rate` is zero.
#[must_use]
pub const fn checked_div_by_fee_rate_floor(self, fee_rate: FeeRate) -> Option<Weight> {
if let Some(msats) = self.to_sat().checked_mul(1000) {
if let Some(wu) = msats.checked_div(fee_rate.to_sat_per_kwu_ceil()) {
return Some(Weight::from_wu(wu));
}
}
None
}
/// Checked fee rate ceiling division.
///
/// Computes the minimum weight that would result in a fee greater than or equal to this amount
/// at the given `fee_rate`. Uses ceiling division to ensure the resulting weight is sufficient.
///
/// Returns [`None`] if overflow occurred or if `fee_rate` is zero.
#[must_use]
pub const fn checked_div_by_fee_rate_ceil(self, fee_rate: FeeRate) -> Option<Weight> {
// Use ceil because result is used as the divisor.
let rate = fee_rate.to_sat_per_kwu_ceil();
if rate == 0 {
return None;
}
if let Some(msats) = self.to_sat().checked_mul(1000) {
// No need to used checked arithmetic because rate is non-zero.
if let Some(bump) = msats.checked_add(rate - 1) {
let wu = bump / rate;
return Some(Weight::from_wu(wu));
}
}
None
}
}
impl default::Default for Amount {

102
units/src/fee.rs
View File

@ -17,108 +17,6 @@ use NumOpResult as R;
use crate::{Amount, FeeRate, MathOp, NumOpError as E, NumOpResult, OptionExt, Weight};
impl Amount {
/// Checked weight floor division.
///
/// Be aware that integer division loses the remainder if no exact division
/// can be made. See also [`Self::checked_div_by_weight_ceil`].
///
/// Returns [`None`] if overflow occurred.
#[must_use]
pub const fn checked_div_by_weight_floor(self, weight: Weight) -> Option<FeeRate> {
let wu = weight.to_wu();
if wu == 0 {
return None;
}
// Mul by 1,000 because we use per/kwu.
match self.to_sat().checked_mul(1_000) {
Some(sats) => {
let fee_rate = sats / wu;
FeeRate::from_sat_per_kwu(fee_rate)
}
None => None,
}
}
/// Checked weight ceiling division.
///
/// Be aware that integer division loses the remainder if no exact division
/// can be made. This method rounds up ensuring the transaction fee rate is
/// sufficient. See also [`Self::checked_div_by_weight_floor`].
///
/// Returns [`None`] if overflow occurred.
///
/// # Examples
///
/// ```
/// # use bitcoin_units::{amount, Amount, FeeRate, Weight};
/// let amount = Amount::from_sat(10)?;
/// let weight = Weight::from_wu(300);
/// let fee_rate = amount.checked_div_by_weight_ceil(weight);
/// assert_eq!(fee_rate, FeeRate::from_sat_per_kwu(34));
/// # Ok::<_, amount::OutOfRangeError>(())
/// ```
#[must_use]
pub const fn checked_div_by_weight_ceil(self, weight: Weight) -> Option<FeeRate> {
let wu = weight.to_wu();
if wu == 0 {
return None;
}
// Mul by 1,000 because we use per/kwu.
if let Some(sats) = self.to_sat().checked_mul(1_000) {
// No need to used checked arithmetic because wu is non-zero.
if let Some(bump) = sats.checked_add(wu - 1) {
let fee_rate = bump / wu;
return FeeRate::from_sat_per_kwu(fee_rate);
}
}
None
}
/// Checked fee rate floor division.
///
/// Computes the maximum weight that would result in a fee less than or equal to this amount
/// at the given `fee_rate`. Uses floor division to ensure the resulting weight doesn't cause
/// the fee to exceed the amount.
///
/// Returns [`None`] if overflow occurred or if `fee_rate` is zero.
#[must_use]
pub const fn checked_div_by_fee_rate_floor(self, fee_rate: FeeRate) -> Option<Weight> {
if let Some(msats) = self.to_sat().checked_mul(1000) {
if let Some(wu) = msats.checked_div(fee_rate.to_sat_per_kwu_ceil()) {
return Some(Weight::from_wu(wu));
}
}
None
}
/// Checked fee rate ceiling division.
///
/// Computes the minimum weight that would result in a fee greater than or equal to this amount
/// at the given `fee_rate`. Uses ceiling division to ensure the resulting weight is sufficient.
///
/// Returns [`None`] if overflow occurred or if `fee_rate` is zero.
#[must_use]
pub const fn checked_div_by_fee_rate_ceil(self, fee_rate: FeeRate) -> Option<Weight> {
// Use ceil because result is used as the divisor.
let rate = fee_rate.to_sat_per_kwu_ceil();
if rate == 0 {
return None;
}
if let Some(msats) = self.to_sat().checked_mul(1000) {
// No need to used checked arithmetic because rate is non-zero.
if let Some(bump) = msats.checked_add(rate - 1) {
let wu = bump / rate;
return Some(Weight::from_wu(wu));
}
}
None
}
}
impl FeeRate {
/// Calculates the fee by multiplying this fee rate by weight.
///