Add support for utf16 character encoding (#26)

* add utf16 line encoding
* making utf16 encoding as option
* adding comments
* fixing inspections

CHANGELOG.md

@@ -4,6 +4,9 @@ This project adheres to [Semantic Versioning](http://semver.org/).
 This CHANGELOG follows the format listed at [Keep A Changelog](http://keepachangelog.com/)
 
 ## [Unreleased]
+### Added
+- Support of UTF16 encoded characters 
+
 ## [1.1.2] - 2017-05-25
 ### Fixed
 - Write the state file atomically by using flock where available (@nlopes)

bin/check-log.rb

@@ -128,6 +128,15 @@ class CheckLog < Sensu::Plugin::Check::CLI
          proc: proc(&:to_i),
          default: 250
 
+  # Use this option when you expecting your log lines to contain invalid byte sequence in utf-8.
+  # https://github.com/sensu-plugins/sensu-plugins-logs/pull/26
+  option :encode_utf16,
+         description: 'Encode line with utf16 before matching',
+         short: '-eu',
+         long: '--encode-utf16',
+         boolean: true,
+         default: false
+
   def run
     unknown 'No log file specified' unless config[:log_file] || config[:file_pattern]
     unknown 'No pattern specified' unless config[:pattern]
@@ -208,6 +217,10 @@ def search_log
         line = get_log_entry(line)
       end
 
+      if config[:encode_utf16]
+        line = line.encode('UTF-16', invalid: :replace, replace: '')
+      end
+
       line = line.encode('UTF-8', invalid: :replace, replace: '')
       bytes_read += line.bytesize
       if config[:case_insensitive]