Remove signers older than the current reward cycle if they have no more blocks to process

stacks-signer/CHANGELOG.md

@@ -12,6 +12,7 @@ and this project adheres to the versioning scheme outlined in the [README.md](RE
 - Introduced the `block_proposal_max_age_secs` configuration option for signers, enabling them to automatically ignore block proposals that exceed the specified age in seconds.
 
 ## Changed
+- Improvements to the stale signer cleanup logic: deletes the prior signer if it has no remaining unprocessed blocks in its database
 
 ## [3.1.0.0.1.0]
 

stacks-signer/src/runloop.rs

@@ -424,23 +424,15 @@ impl<Signer: SignerTrait<T>, T: StacksMessageCodec + Clone + Send + Debug> RunLo
         let mut to_delete = Vec::new();
         for (idx, signer) in &mut self.stacks_signers {
             let reward_cycle = signer.reward_cycle();
-            let next_reward_cycle = reward_cycle.wrapping_add(1);
-            let stale = match next_reward_cycle.cmp(&current_reward_cycle) {
-                std::cmp::Ordering::Less => true, // We are more than one reward cycle behind, so we are stale
-                std::cmp::Ordering::Equal => {
-                    // We are the next reward cycle, so check if we were registered and have any pending blocks to process
-                    match signer {
-                        ConfiguredSigner::RegisteredSigner(signer) => {
-                            !signer.has_unprocessed_blocks()
-                        }
-                        _ => true,
-                    }
+            if reward_cycle >= current_reward_cycle {
+                // We are either the current or a future reward cycle, so we are not stale.
+                continue;
+            }
+            if let ConfiguredSigner::RegisteredSigner(signer) = signer {
+                if !signer.has_unprocessed_blocks() {
+                    debug!("{signer}: Signer's tenure has completed.");
+                    to_delete.push(*idx);
                 }
-                std::cmp::Ordering::Greater => false, // We are the current reward cycle, so we are not stale
-            };
-            if stale {
-                debug!("{signer}: Signer's tenure has completed.");
-                to_delete.push(*idx);
             }
         }
         for idx in to_delete {