perf: prevent waiting for the mutex to be released (#122)

Author: supercaracal

lib/redis_client/cluster/node.rb

@@ -181,6 +181,8 @@ def any_replica_node_key(seed: nil)
       end
 
       def update_slot(slot, node_key)
+        return if @mutex.locked?
+
         @mutex.synchronize { @slots[slot] = node_key }
       end
 

lib/redis_client/cluster/router.rb

@@ -281,6 +281,8 @@ def fetch_cluster_info(config, pool: nil, **kwargs) # rubocop:disable Metrics/Me
       end
 
       def update_cluster_info!
+        return if @mutex.locked?
+
         @mutex.synchronize do
           begin
             @node.each(&:close)

lib/redis_client/cluster_config.rb

@@ -83,10 +83,14 @@ def use_replica?
     end
 
     def update_node(addrs)
+      return if @mutex.locked?
+
       @mutex.synchronize { @node_configs = build_node_configs(addrs) }
     end
 
     def add_node(host, port)
+      return if @mutex.locked?
+
       @mutex.synchronize { @node_configs << { host: host, port: port } }
     end