fix(cardano-chain-follower): slot

Signed-off-by: bkioshn <[email protected]>

Author: bkioshn

rust/cardano-chain-follower/src/chain_sync.rs

@@ -194,7 +194,7 @@ async fn process_rollback(
     let slot_rollback_size = if head_slot > rollback_slot {
         head_slot - rollback_slot
     } else {
-        0
+        0.into()
     };
 
     // We actually do the work here...
@@ -203,7 +203,7 @@ async fn process_rollback(
     // We never really know how many blocks are rolled back when advised by the peer, but we
     // can work out how many slots. This function wraps the real work, so we can properly
     // record the stats when the rollback is complete. Even if it errors.
-    stats::rollback(chain, stats::RollbackType::Peer, slot_rollback_size);
+    stats::rollback(chain, stats::RollbackType::Peer, slot_rollback_size.into());
 
     Ok(response)
 }

rust/cardano-chain-follower/src/mithril_snapshot_iterator.rs

@@ -6,7 +6,7 @@ use std::{
     sync::{Arc, Mutex},
 };
 
-use cardano_blockchain_types::{MultiEraBlock, Network, Point, Slot};
+use cardano_blockchain_types::{MultiEraBlock, Network, Point};
 use logcall::logcall;
 use tokio::task;
 use tracing::{debug, error};
@@ -54,7 +54,7 @@ pub(crate) struct MithrilSnapshotIterator {
 pub(crate) fn probe_point(point: &Point, distance: u64) -> Point {
     // Now that we have the tip, step back about 4 block intervals from tip, and do a fuzzy
     // iteration to find the exact two blocks at the end of the immutable chain.
-    let step_back_search = Slot::from_saturating(point.slot_or_default().into() - distance);
+    let step_back_search = point.slot_or_default() - distance.into();
 
     // We stepped back to the origin, so just return Origin
     if step_back_search == 0.into() {