use DB module

lib/ws2p/connection.ex

@@ -348,12 +348,9 @@ defmodule WS2P.Connection do
 
         # TODO
         %{"name" => "BLOCK", "block" => block} ->
-          :dets.open_file(:block, [{:file, 'data/block'}, {:type, :set}])
-          :dets.open_file(:global_bindex, [{:file, 'data/global_bindex'}, {:type, :set}])
-
           existing_block =
-            :dets.lookup(:block, block["number"]) != [] and
-              :dets.lookup(:global_bindex, block["number"]) != []
+            DB.lookup('block', block["number"]) != [] and
+              DB.lookup('global_bindex', block["number"]) != []
 
           if !existing_block do
             case Block.Validation.Local.valid(block) do