Improve Rpc inflation tooling (#10309)

automerge

genesis-programs/src/lib.rs

@@ -16,26 +16,28 @@ use log::*;
 use solana_runtime::bank::{Bank, EnteredEpochCallback};
 
 pub fn get_inflation(operating_mode: OperatingMode, epoch: Epoch) -> Option<Inflation> {
+    let past_epoch_inflation = get_inflation_for_epoch(operating_mode, epoch.saturating_sub(1));
+    let epoch_inflation = get_inflation_for_epoch(operating_mode, epoch);
+
+    if epoch_inflation != past_epoch_inflation || epoch == 0 {
+        Some(epoch_inflation)
+    } else {
+        None
+    }
+}
+
+pub fn get_inflation_for_epoch(operating_mode: OperatingMode, epoch: Epoch) -> Inflation {
     match operating_mode {
-        OperatingMode::Development => {
-            if epoch == 0 {
-                Some(Inflation::default())
-            } else {
-                None
-            }
-        }
+        OperatingMode::Development => Inflation::default(),
         OperatingMode::Stable | OperatingMode::Preview => {
-            if epoch == 0 {
-                // No inflation at epoch 0
-                Some(Inflation::new_disabled())
-            } else if epoch == std::u64::MAX {
+            if epoch == std::u64::MAX {
                 // Inflation starts
-                //
-                // The epoch of std::u64::MAX - 1 is a placeholder and is expected to be reduced in
+                // The epoch of std::u64::MAX is a placeholder and is expected to be reduced in
                 // a future hard fork.
-                Some(Inflation::default())
+                Inflation::default()
             } else {
-                None
+                // No inflation from epoch 0
+                Inflation::new_disabled()
             }
         }
     }