fix issue #7

Do not calculate statistics when there is no session so far. Return zero
instead of that.

Signed-off-by: Pavel Pulec <[email protected]>

Author: Pavel Pulec

Diff for: check_haproxy.rb

@@ -115,7 +115,11 @@
   perf_id = "#{row['pxname']}".downcase
 
   if row['svname'] == 'FRONTEND'
-    session_percent_usage = row['scur'].to_i * 100 / row['slim'].to_i
+    if row['slim'].to_i == 0
+      session_percent_usage = 0
+    else
+      session_percent_usage = row['scur'].to_i * 100 / row['slim'].to_i
+    end
     @perfdata << "#{perf_id}_sessions=#{session_percent_usage}%;#{options.warning ? options.warning : ""};#{options.critical ? options.critical : ""};;"
     @perfdata << "#{perf_id}_rate=#{row['rate']};;;;#{row['rate_max']}"
     if options.critical && session_percent_usage > options.critical.to_i