Method: LogStash::Filters::Redis#filter

Defined in:
lib/logstash/filters/redis.rb

#filter(event) ⇒ Object 



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# File 'lib/logstash/filters/redis.rb', line 55

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

  # Allow dynamic key names using fields etc
  key = event.sprintf(@key)

  relevant = [@store_tag, @retrieve_tag].select do |t|
     event["tags"].include?(t)
  end
 
  @logger.debug(relevant)
  return unless [] != relevant
 
  # Do we retrieve data from a prior event?
  # N.b. we retrieve before we store so that we can do both if we want!
  # (e.g. packet sequence numbers? ...)
  #
  if event["tags"].include?(@retrieve_tag)
    @logger.debug("Found retrieve tag %{retrieve_tag}")
    @redis ||= connect
    val = @redis.get(key)
    if val != nil
      @logger.debug("Found key in Redis")
      JSON.parse(val).each do |k,v|
        event[prefix + k] = v
      end
      if @delete
        @redis.del(key) && @logger.debug("Deleted key")
      end
    else
      @logger.debug("Key not found in Redis")
    end
  end
  # Do we store data? 
  if event["tags"].include?(@store_tag)
    @logger.debug("Found store tag %{store_tag}")
    val = event.to_hash().select { |name,value| fields.include?(name) }
    @redis ||= connect
    @redis.set(key, val.to_json) && @logger.debug("Stored key")
    @redis.expire(key, @expiry) && @logger.debug("Set expiry key")
  end
  # filter_matched should go in the last line of our successful code
  filter_matched(event)
end