bug fix

lib/path.rb

@@ -37,13 +37,18 @@ def out_port
     path.last
   end
 
+  def length
+    path.length / 2
+  end
+
   private
 
   def flows
     path[1..-2].each_slice(2).to_a
   end
 
   def flow_mod_add_to_each_switch
+    return if path.length == 1
     path.each_slice(2) do |in_port, out_port|
       send_flow_mod_add(out_port.dpid,
                         hard_timeout: 60,
@@ -53,6 +58,7 @@ def flow_mod_add_to_each_switch
   end
 
   def flow_mod_delete_to_each_switch
+    return if path.length == 1
     path.each_slice(2) do |in_port, out_port|
       send_flow_mod_delete(out_port.dpid,
                            match: exact_match(in_port.number),
@@ -65,6 +71,6 @@ def exact_match(in_port)
   end
 
   def path
-    @full_path[1..-2]
+    @full_path.length > 1 ? @full_path[1..-2] : @full_path
   end
 end

lib/path_manager.rb

@@ -13,7 +13,13 @@ def start
   # This method smells of :reek:FeatureEnvy but ignores them
   def packet_in(_dpid, message)
     path = maybe_create_shortest_path(message)
-    ports = path ? [path.out_port] : external_ports
+
+    unless path.nil?
+      ports = path.length >= 1 ? [path.out_port] : @graph[path.out_port]
+    else
+      ports = external_ports
+    end
+
     ports.each do |each|
       send_packet_out(each.dpid,
                       raw_data: message.raw_data,