Class: LogStash::Filters::Sentimentalizer

Inherits:
Base
  • Object
show all
Defined in:
lib/logstash/filters/sentimentalizer.rb

Overview

This plugin will analyze sentiment of a specified field and enrich the event with sentiment probability values.

Instance Method Summary collapse

Instance Method Details

#filter(event) ⇒ Object

def register



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# File 'lib/logstash/filters/sentimentalizer.rb', line 34

def filter(event)
  return unless filter?(event)

  source = event.get(@source)
  source.gsub!(/\B#(\S+)\b/, '\1') if @scrub

  unless source.nil?
    begin
      sentiment = Sentimentalizer.analyze(source)
    rescue NoMethodError => e
      @logger.error(
        'Error parsing sentiment for field',
        :exception => e,
        :field => source
      )
    end

    unless sentiment.nil?
      event.set(
        @target,
        'probability' => sentiment.overall_probability,
        'polarity'    => sentiment.sentiment
      )
    end
  end

  # filter_matched should go in the last line of our successful code
  filter_matched(event)
end

#register ⇒ Object 



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# File 'lib/logstash/filters/sentimentalizer.rb', line 22

def register
  require 'sentimentalizer'

  # Monkey patch the weird defaults for positive/negative string values
  %w[POSITIVE NEGATIVE NEUTRAL].each do |s|
    Sentiment.send(:remove_const, s)
    Sentiment.const_set(s, s.downcase)
  end

  Sentimentalizer.setup
end