From 37dec51574ccc2df76f88801a31cc9b1b08af62c Mon Sep 17 00:00:00 2001
From: Erik Ruggles <erikr@tempworks.com>
Date: Mon, 4 Oct 2021 15:06:43 -0500
Subject: [PATCH] Prevent divide by zero error

When there were no hits or misses against a node, the result being returned was NaN as a result of a divide by zero issue. This approach converts the NaN result to a zero.
---
 Program.cs | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/Program.cs b/Program.cs
index 7ef429c..4cb0895 100644
--- a/Program.cs
+++ b/Program.cs
@@ -335,7 +335,7 @@ private static void Main(string[] args)
                                 channel = "Hit Rate",
                                 unit = PRTGUnit.Percent,
                                 Float=1,
-                                value = (Convert.ToDouble(statsInfo.SingleOrDefault(i => i.Key.Equals("keyspace_hits")).Value) / (Convert.ToDouble(statsInfo.SingleOrDefault(i => i.Key.Equals("keyspace_hits")).Value) + Convert.ToDouble(statsInfo.SingleOrDefault(i => i.Key.Equals("keyspace_misses")).Value))).ToString()
+                                value = SafeGetFloat(() => (Convert.ToDouble(statsInfo.SingleOrDefault(i => i.Key.Equals("keyspace_hits")).Value) / (Convert.ToDouble(statsInfo.SingleOrDefault(i => i.Key.Equals("keyspace_hits")).Value) + Convert.ToDouble(statsInfo.SingleOrDefault(i => i.Key.Equals("keyspace_misses")).Value))).ToString())
                             }
                         },
                         {
@@ -405,5 +405,20 @@ private static string SafeGetInt32(Func<string> func)
                 return "0";
             }
         }
+        
+        private static string SafeGetFloat(Func<string> func)
+        {
+            try
+            {
+                var result = func();
+                return result.Equals("NaN", StringComparison.InvariantCultureIgnoreCase) ? "0" : result;
+
+            }
+            catch (Exception ex)
+            {
+                Trace.TraceError(ex.ToString());
+                return "0";
+            }
+        }
     }
 }
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