Improve SlotMap printing in logs.

redis/src/cluster_async/mod.rs

@@ -754,7 +754,7 @@ where
             num_of_nodes_to_query,
             inner.cluster_params.read_from_replicas,
         )?;
-        info!("Found slot map: {new_slots:?}");
+        info!("Found slot map: {new_slots}");
         let connections = &*read_guard;
         // Create a new connection vector of the found nodes
         let mut nodes = new_slots.values().flatten().collect::<Vec<_>>();

redis/src/cluster_topology.rs

@@ -5,6 +5,7 @@ use crate::cluster_routing::{MultipleNodeRoutingInfo, Route, Slot, SlotAddr, Slo
 use crate::{cluster::TlsMode, ErrorKind, RedisError, RedisResult, Value};
 use derivative::Derivative;
 use std::collections::{hash_map::DefaultHasher, BTreeMap, HashMap, HashSet};
+use std::fmt::Display;
 use std::hash::{Hash, Hasher};
 use std::sync::atomic::AtomicUsize;
 use std::time::Duration;
@@ -167,6 +168,23 @@ impl SlotMap {
     }
 }
 
+impl Display for SlotMap {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        write!(f, "Strategy: {:?}. Slot mapping:\n", self.read_from_replica)?;
+        for (end, slot_map_value) in self.slots.iter() {
+            writeln!(
+                f,
+                "({}-{}): primary: {}, replicas: {:?}",
+                slot_map_value.start,
+                end,
+                slot_map_value.addrs.primary,
+                slot_map_value.addrs.replicas
+            )?;
+        }
+        Ok(())
+    }
+}
+
 pub(crate) fn slot(key: &[u8]) -> u16 {
     crc16::State::<crc16::XMODEM>::calculate(key) % SLOT_SIZE
 }