Update metrics-snmp-if.rb (#23)

* Update metrics-snmp-if.rb

add timeout option

* appeasing the cops and adding a changelog entry.

CHANGELOG.md

@@ -6,6 +6,9 @@ Which is based on [Keep A Changelog](http://keepachangelog.com/)
 
 ## [Unreleased]
 
+### Added
+- metrics-snmp-if.rb: added `--timeout|-t` option which controls the request timeout (@rocdove)
+
 ## [2.0.0] - 2017-11-04
 
 ### Changed

bin/metrics-snmp-if.rb

@@ -123,6 +123,12 @@ class SNMPIfStatsGraphite < Sensu::Plugin::Metric::CLI::Graphite
          default: false,
          description: 'Use low capacity counters'
 
+  option :timeout,
+         short: '-t TIMEOUT',
+         long: '--timeout TIMEOUT',
+         default: 5,
+         description: 'Request timeout'
+
   def run # rubocop:disable Metrics/AbcSize
     if_table_HC_columns = %w(
       ifHCInOctets ifHCOutOctets
@@ -143,7 +149,13 @@ def run # rubocop:disable Metrics/AbcSize
     if_table_columns = if_table_common_columns +
                        (config[:low_capacity] ? if_table_LC_columns : if_table_HC_columns)
 
-    SNMP::Manager.open(host: config[:host].to_s, port: config[:port].to_i, community: config[:community].to_s, version: config[:version]) do |manager|
+    SNMP::Manager.open(
+      host: config[:host].to_s,
+      port: config[:port].to_i,
+      community: config[:community].to_s,
+      version: config[:version],
+      timeout: config[:timeout]
+    ) do |manager|
       manager.walk(if_table_columns) do |row_array|
         # turn row (an array) into a hash for eaiser access to the columns
         row = Hash[*if_table_columns.zip(row_array).flatten]