global: add hash related datasets

crates/brk_structs/src/structs/halvingepoch.rs

@@ -10,6 +10,8 @@ use zerocopy_derive::{FromBytes, Immutable, IntoBytes, KnownLayout};
 
 use super::Height;
 
+pub const BLOCKS_PER_HALVING: u32 = 210_000;
+
 #[derive(
     Debug,
     Clone,
@@ -78,7 +80,7 @@ impl Add<usize> for HalvingEpoch {
 
 impl From<Height> for HalvingEpoch {
     fn from(value: Height) -> Self {
-        Self((u32::from(value) / 210_000) as u16)
+        Self((u32::from(value) / BLOCKS_PER_HALVING) as u16)
     }
 }
 

crates/brk_structs/src/structs/height.rs

@@ -12,7 +12,7 @@ use vecdb::{CheckedSub, Printable, Stamp, StoredCompressed};
 use zerocopy::{FromBytes, IntoBytes};
 use zerocopy_derive::{FromBytes, Immutable, IntoBytes, KnownLayout};
 
-use crate::{BLOCKS_PER_DIFF_EPOCHS, copy_first_4bytes};
+use crate::{BLOCKS_PER_DIFF_EPOCHS, BLOCKS_PER_HALVING, copy_first_4bytes};
 
 use super::StoredU64;
 
@@ -74,7 +74,11 @@ impl Height {
     }
 
     pub fn left_before_next_diff_adj(self) -> u32 {
-        BLOCKS_PER_DIFF_EPOCHS - (*self % 2016)
+        BLOCKS_PER_DIFF_EPOCHS - (*self % BLOCKS_PER_DIFF_EPOCHS)
+    }
+
+    pub fn left_before_next_halving(self) -> u32 {
+        BLOCKS_PER_HALVING - (*self % BLOCKS_PER_HALVING)
     }
 }