feat(consensus): weighted rotation, skip tracking, auto-unban

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

CHANGELOG.md

@@ -7,6 +7,15 @@ Format: [Keep a Changelog](https://keepachangelog.com/en/1.1.0/)
 
 ## [Unreleased]
 
+## [0.10.0] — 2026-04-24
+
+### Added
+- `block_loop`: her slot başında süresi dolan ban'lar kaldırılır (`unban_expired_validators`)
+- `block_loop`: beklenen validator blok üretmezse `record_validator_skip` ile skip_count artar; 10 art arda skip → deactivation
+
+### Changed
+- `validator_set::weighted_shuffle`: deterministik ağırlıklı sıralama — her adaya `hash(seed||i)^(1/pon_score²)` skoru atanır; yüksek PoN skoru schedule'da öne geçer
+
 ## [0.9.0] — 2026-04-24
 
 ### Added

crates/nu-consensus/src/validator_set.rs

@@ -70,14 +70,28 @@ impl ValidatorSet {
         h.finalize().into()
     }
 
+    /// Weighted sort: each candidate gets score = hash(seed||i)^(1/pon_score²).
+    /// Higher PoN score → smaller exponent → larger value → earlier in schedule.
     fn weighted_shuffle(candidates: &mut Vec<&ValidatorRecord>, seed: &[u8; 32]) {
-        for i in (1..candidates.len()).rev() {
-            let key = u64::from_le_bytes(seed[..8].try_into().unwrap())
-                .wrapping_add(i as u64)
-                .wrapping_mul(candidates[i].pon_score.to_bits());
-            let j = (key as usize) % (i + 1);
-            candidates.swap(i, j);
-        }
+        let mut scores: Vec<(usize, f64)> = candidates
+            .iter()
+            .enumerate()
+            .map(|(i, v)| {
+                let mut h = Sha256::new();
+                h.update(seed);
+                h.update((i as u64).to_le_bytes());
+                let hash_val = u64::from_le_bytes(h.finalize()[..8].try_into().unwrap());
+                let u = (hash_val as f64) / (u64::MAX as f64 + 1.0);
+                let weighted = u.powf(1.0 / (v.pon_score * v.pon_score));
+                (i, weighted)
+            })
+            .collect();
+
+        scores.sort_by(|a, b| b.1.partial_cmp(&a.1).unwrap_or(std::cmp::Ordering::Equal));
+
+        let ordered: Vec<&ValidatorRecord> = scores.iter().map(|(i, _)| candidates[*i]).collect();
+        candidates.clear();
+        candidates.extend(ordered);
     }
 }
 

src/block_loop.rs

@@ -9,6 +9,7 @@ use nu_block::{
 };
 use nu_consensus::{
     slot::current_slot,
+    slashing::record_skip,
     types::ValidatorRecord,
     validator_set::ValidatorSet,
 };
@@ -58,12 +59,23 @@ pub async fn run(
             load_validator_set(&db_guard)
         };
 
+        // Try unban any validators whose ban period has expired
+        {
+            let db_guard = db.lock().await;
+            unban_expired_validators(&db_guard, slot);
+        }
+
         // Rotation check: in non-dev mode skip if not our slot
         if !config.dev_mode {
             let expected = validator_set.slot_producer(slot, &prev_hash);
             match &expected {
                 Some(addr) if addr != &config.validator_addr => {
                     tracing::debug!(slot, expected = %addr, "not our slot — skipping");
+                    // Record a skip for the expected producer who didn't produce
+                    {
+                        let db_guard = db.lock().await;
+                        record_validator_skip(&db_guard, addr);
+                    }
                     continue;
                 }
                 None => {
@@ -156,6 +168,42 @@ pub async fn run(
     }
 }
 
+fn unban_expired_validators(db: &StateDb, current_slot: u32) {
+    let records: Vec<ValidatorState> = db.scan_prefix("validator:");
+    for mut vs in records {
+        if vs.ban_until_slot > 0 && current_slot >= vs.ban_until_slot {
+            vs.is_active      = true;
+            vs.ban_until_slot = 0;
+            let _ = db.put(&format!("validator:{}", vs.address), &vs);
+            tracing::info!(address = %vs.address, slot = current_slot, "validator unbanned");
+        }
+    }
+}
+
+fn record_validator_skip(db: &StateDb, address: &str) {
+    if let Ok(Some(mut vs)) = db.get::<ValidatorState>(&format!("validator:{address}")) {
+        let mut record = ValidatorRecord {
+            address:           vs.address.clone(),
+            stake:             vs.stake,
+            pon_score:         vs.pon_score,
+            is_active:         vs.is_active,
+            last_block:        vs.last_block,
+            slash_count:       vs.slash_count,
+            skip_count:        vs.skip_count,
+            consecutive_blocks: vs.consecutive_blocks,
+            ban_until_slot:    vs.ban_until_slot,
+        };
+        let deactivated = record_skip(&mut record);
+        vs.skip_count         = record.skip_count;
+        vs.consecutive_blocks = record.consecutive_blocks;
+        vs.is_active          = record.is_active;
+        let _ = db.put(&format!("validator:{address}"), &vs);
+        if deactivated {
+            tracing::warn!(address, "validator deactivated after 10 consecutive skips");
+        }
+    }
+}
+
 fn load_validator_set(db: &StateDb) -> ValidatorSet {
     let mut set = ValidatorSet::new();
     let records: Vec<ValidatorState> = db.scan_prefix("validator:");