Logstash Plugin

This is a plugin for Logstash.

It is fully free and fully open source. The license is Apache 2.0, meaning you are pretty much free to use it however you want in whatever way.


The aim of this filter is to recognize a URI in rails controller#action form.


  • rails routes table. Make use of rails rake routes, we can gather all path patterns in a rails application. bundle exec rake routes | tail -n +2 > routes_spec

The result may look like

users POST /users(.:format)     users#create
      GET  /users(.:format)     users#index
      GET  /users/:id(.:format) users#show

Example #1

  • with these given logs:

    2015-11-18T09:45:58.797031Z "GET https://some.domain.com/api/users/1"
  • you can use grok to recognize http verb and uri separately and use railsroutes to figure out the rails controller and action, even the parameters inside the uri can be extracted as well.

    filter {
    grok {
    match => ['message', '%{TIMESTAMP_ISO8601:timestamp} "%{WORD:http_verb} %{URI:url}"']
    railsroutes {
    verb_source => 'http_verb'
    uri_source => 'url'
    routes_spec => '/somewhere/to/your/rails/routes/table'
    api_prefix => 'https://some.domain.com/api'
    target => 'rails'
  • the final event then looks like:

    "message": "2015-11-18T09:45:58.797031Z \"GET https://some.domain.com/api/users/1\"",
    "http_verb": "GET",
    "url": "https://some.domain.com/api/users/1",
    "rails": {
        "controller#action": "users#show",
        "id": "1",
        "format": null


All contributions are welcome: ideas, patches, documentation, bug reports, complaints, and even something you drew up on a napkin.

Programming is not a required skill. Whatever you've seen about open source and maintainers or community members saying "send patches or die" - you will not see that here.

It is more important to the community that you are able to contribute.

For more information about contributing, see the CONTRIBUTING file.