refactor

core/api/src/state/bus.rs

@@ -0,0 +1,32 @@
+use bytemuck::{Pod, Zeroable};
+use shank::ShankAccount;
+
+use crate::{
+    impl_account_from_bytes, impl_to_bytes,
+    utils::{AccountDiscriminator, Discriminator},
+};
+
+/// Bus accounts are responsible for distributing mining rewards.
+/// There are 8 busses total to minimize write-lock contention and allow for parallel mine operations.
+#[repr(C)]
+#[derive(Clone, Copy, Debug, PartialEq, Pod, ShankAccount, Zeroable)]
+pub struct Bus {
+    /// The ID of the bus account.
+    pub id: u64,
+
+    /// The remaining rewards this bus has left to payout in the current epoch.
+    pub rewards: u64,
+
+    /// The rewards this bus would have paid out in the current epoch if there no limit.
+    /// Used to calculate the updated reward rate.
+    pub theoretical_rewards: u64,
+}
+
+impl Discriminator for Bus {
+    fn discriminator() -> AccountDiscriminator {
+        AccountDiscriminator::Bus
+    }
+}
+
+impl_to_bytes!(Bus);
+impl_account_from_bytes!(Bus);