Class: LogStash::Filters::Trigger

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

Overview

Applies the triggers to events, read from file

Constant Summary collapse

JavaException = 
java.lang.Exception
UTC = 
org.joda.time.DateTimeZone.forID("UTC")

Instance Method Summary collapse

Instance Method Details

#filter(event) ⇒ Object 



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# File 'lib/logstash/filters/trigger.rb', line 118

def filter(event)
    matches = 0
    dirname = File.dirname(event["path"])

    cleanup_triggers(event)

    read_triggers(dirname)

    @triggers[dirname].each do |trigger|

        startTime = trigger[:timestamp]
        startTime -= trigger[:timespan].to_i

        endTime = trigger[:timestamp]
        endTime += trigger[:timespan].to_i

        if event.timestamp >= startTime && event.timestamp <= endTime
            event[@trigger_attribute] ||= []
            event[@trigger_attribute] << trigger unless event[@trigger_attribute].include?(trigger)
            matches += 1
        end
    end

    if matches > 0
      filter_matched(event)
    else
        if @drop == true
            @logger.debug("trigger: dropping event, no matches") if @logger.debug?
            event.cancel
        else
            @logger.debug("trigger: no matches, but drop set to false") if @logger.debug?
        end
    end
end

#register ⇒ Object 



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# File 'lib/logstash/filters/trigger.rb', line 68

def register
    require "grok-pure" # rubygem 'jls-grok'
    # Detect if we are running from a jarfile, pick the right path.
    patterns_path = []
    if __FILE__ =~ /file:\/.*\.jar!.*/
      patterns_path += ["#{File.dirname(__FILE__)}/../../patterns/*"]
    else
      patterns_path += ["#{File.dirname(__FILE__)}/../../../patterns/*"]
    end

    @grok = Grok.new

    @patterns_dir = patterns_path.to_a + @patterns_dir
    @patterns_dir.each do |path|
      # Can't read relative paths from jars, try to normalize away '../'
      while path =~ /file:\/.*\.jar!.*\/\.\.\//
        # replace /foo/bar/../baz => /foo/baz
        path = path.gsub(/[^\/]+\/\.\.\//, "")
      end

      if File.directory?(path)
        path = File.join(path, "*")
      end

      Dir.glob(path).each do |file|
        @logger.info("Grok loading patterns from file", :path => file)
        @grok.add_patterns_from_file(file)
      end
    end

    @grok.compile(@trigger_pattern)


    joda_parser = org.joda.time.format.DateTimeFormat.forPattern(@trigger_format).withDefaultYear(Time.new.year)
    if @timezone
        joda_parser = joda_parser.withZone(org.joda.time.DateTimeZone.forID(@timezone))
    else
        joda_parser = joda_parser.withOffsetParsed
    end

    @parser = lambda { |date| joda_parser.parseDateTime(date) }


    @triggers = Hash.new { |h,k| h[k] = [] }
    @last_trigger_times = Hash.new { |h,k| h[k] = [] }

    @trigger_cleanup_interval = 10
end