Run Logstash with local ruby2.4

Elastic Stack Logstash
1

Hi,

I am a newbie in-terms of Ruby.

I am trying to extend the ruby-filewatch library used by the logstash-input-file plugin.

For the extension I'm using the external lib - rest-client. This external lib requires ruby 2.0 or above to run successfully.

I have made my changes in ruby-filewatch and done

gem build filewatch.gemspec
gem install filewatch-0.9.0.gem

This installs the generated lib filewatch-0.9.0 under my ~/.rvm/gems/ruby-2.4.0/gems folder.

However, whenever I run logstash with - logstash -f [CONF_PATH] it looks for the required libs for it input plugins inside [LOGSTASH_HOME]/vendor/bundle/jruby/1.9/gems

So I copied the generated filewatch-0.9.0 folder into the above path.

But still I get the following error:

LoadError: no such file to load -- rest-client
       require at org/jruby/RubyKernel.java:1040
       require at [PATH]/logstash-5.3.0/vendor/bundle/jruby/1.9/gems/polyglot-0.3.5/lib/polyglot.rb:65
        (root) at [PATH]/logstash-5.3.0/vendor/bundle/jruby/1.9/gems/filewatch-0.9.0/lib/filewatch/observing_tail.rb:2

observing_tail.rb:2 has this code :

require 'rest-client'

Can someone help me get through this issue??

2

Logstash cannot run with Ruby. It now has many components written in native Java, so it can only run with JRuby.

3

Okay. I am NOT very familiar with the differences of JRuby and Ruby.

Can you help achieve what I am trying to do?

I have the default logstash-input-file plugin. I want to make a modification to the filewatcher library this plugin uses. The modification includes making a REST call and getting a response.
For this purpose, I tried to use rest-client library.

If this is not the right one, then what's the right way to do it?

Thank You