global: utxos part 2

crates/brk_core/src/structs/cents.rs

@@ -3,6 +3,8 @@ use std::ops::{Add, Div, Mul};
 use serde::Serialize;
 use zerocopy_derive::{FromBytes, Immutable, IntoBytes, KnownLayout};
 
+use crate::CheckedSub;
+
 use super::Dollars;
 
 #[derive(
@@ -88,3 +90,9 @@ impl Mul<usize> for Cents {
         Self(self.0 * rhs as u64)
     }
 }
+
+impl CheckedSub for Cents {
+    fn checked_sub(self, rhs: Self) -> Option<Self> {
+        self.0.checked_sub(rhs.0).map(Cents::from)
+    }
+}

crates/brk_core/src/structs/dollars.rs

@@ -1,12 +1,14 @@
 use std::{
     f64,
-    ops::{Add, Div, Mul},
+    ops::{Add, AddAssign, Div, Mul},
 };
 
 use derive_deref::Deref;
 use serde::Serialize;
 use zerocopy_derive::{FromBytes, Immutable, IntoBytes, KnownLayout};
 
+use crate::CheckedSub;
+
 use super::{Bitcoin, Cents, Close, Sats, StoredF32, StoredF64};
 
 #[derive(
@@ -170,3 +172,17 @@ impl From<Dollars> for u128 {
         u128::from(Cents::from(value))
     }
 }
+
+impl AddAssign for Dollars {
+    fn add_assign(&mut self, rhs: Self) {
+        *self = Dollars::from(Cents::from(*self) + Cents::from(rhs));
+    }
+}
+
+impl CheckedSub for Dollars {
+    fn checked_sub(self, rhs: Self) -> Option<Self> {
+        Cents::from(self)
+            .checked_sub(Cents::from(rhs))
+            .map(Dollars::from)
+    }
+}

crates/brk_core/src/structs/sats.rs

@@ -28,10 +28,12 @@ use super::{Bitcoin, Cents, Dollars, Height};
 )]
 pub struct Sats(u64);
 
+#[allow(clippy::inconsistent_digit_grouping)]
 impl Sats {
     pub const ZERO: Self = Self(0);
     pub const MAX: Self = Self(u64::MAX);
-    pub const ONE_BTC: Self = Self(100_000_000);
+    pub const ONE_BTC: Self = Self(1_00_000_000);
+    pub const FIFTY_BTC: Self = Self(50_00_000_000);
 
     pub fn is_zero(&self) -> bool {
         *self == Self::ZERO

crates/brk_core/src/structs/stored_usize.rs

@@ -1,6 +1,6 @@
 use std::ops::{Add, Div};
 
-use derive_deref::Deref;
+use derive_deref::{Deref, DerefMut};
 use serde::Serialize;
 use zerocopy_derive::{FromBytes, Immutable, IntoBytes, KnownLayout};
 
@@ -15,6 +15,7 @@ use super::{
 #[derive(
     Debug,
     Deref,
+    DerefMut,
     Clone,
     Default,
     Copy,