Solving bitwalker#140

lib/swarm/distribution/ring.ex

@@ -7,5 +7,10 @@ defmodule Swarm.Distribution.Ring do
   def add_node(ring, node, weight), do: HashRing.add_node(ring, node, weight)
   def add_nodes(ring, nodes), do: HashRing.add_nodes(ring, nodes)
   def remove_node(ring, node), do: HashRing.remove_node(ring, node)
-  def key_to_node(ring, key), do: HashRing.key_to_node(ring, key)
+  def key_to_node(ring, key) do
+    case HashRing.key_to_node(ring, key) do
+      {:error, _reason} -> :undefined
+      node -> node
+    end
+  end
 end

lib/swarm/tracker/tracker.ex

@@ -1188,7 +1188,7 @@ defmodule Swarm.Tracker do
         debug "The node #{worker_name} was not found in the registry"
       entry(name: name, pid: pid, meta: %{mfa: _mfa} = meta) = obj ->
         case Strategy.remove_node(state.strategy, state.self) |> Strategy.key_to_node(name) do
-          {:error, {:invalid_ring, :no_nodes}} ->
+          :undefined ->
             debug "Cannot handoff #{inspect name} because there is no other node left"
           other_node ->
             debug "#{inspect name} has requested to be terminated and resumed on another node"