From 517365353bd9cdc14979cd003a0256f1945c5aca Mon Sep 17 00:00:00 2001
From: Evgeniy Filatov <evgeniyfilatov@gmail.com>
Date: Tue, 2 Oct 2018 02:01:08 +0300
Subject: [PATCH] improved error message when there is issue communicating with
 node

---
 lib/core/modules/coderunner/codeRunner.js | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/lib/core/modules/coderunner/codeRunner.js b/lib/core/modules/coderunner/codeRunner.js
index a00db4b1..2761319d 100644
--- a/lib/core/modules/coderunner/codeRunner.js
+++ b/lib/core/modules/coderunner/codeRunner.js
@@ -93,6 +93,11 @@ class CodeRunner {
       const value = await result;
       cb(null, value);
     } catch (error) {
+      // Improve error message when there's no connection to node
+      if (error.message.indexOf('Invalid JSON RPC response') !== -1) {
+        error.message += '. Are you connected to an Ethereum node?';
+      }
+
       cb(error);  
     }
   }