Contents

# {
#   "scan": {
#     "field": "",
#     "pattern": "",
#     "target": ""
#   }
# }
module Anschel
  class Filter
    def scan conf, stats, log
      field   = conf.delete :field
      pattern = Regexp.new conf.delete(:pattern)
      target  = conf.delete :target

      raise 'Missing required "field" for "scan" filter' if field.nil?
      raise 'Missing required "pattern" for "scan" filter' if pattern.nil?
      raise 'Missing required "target" for "convert" filter' if target.nil?

      field  = field.to_sym
      target = target.to_sym

      stats.create 'filter-scan'
      stats.get 'filter-scan'
      stats.create 'filter-scan-skipped'
      stats.get 'filter-scan-skipped'
      stats.create 'filter-scan-nomatch'
      stats.get 'filter-scan-nomatch'
      stats.create 'filter-scan-error'
      stats.get 'filter-scan-error'

      log.trace event: 'filter-compiled', kind: 'scan', \
        field: field, pattern: pattern, target: target

      lambda do |event|
        unless event.has_key? field
          stats.inc 'filter-scan-skipped'
          return event
        end
        begin
          results = event[field].scan(pattern).flatten.uniq
        rescue StandardError
          log.trace \
            event: 'scan-filter-error',
            reason: 'could not scan event',
            field: field,
            pattern: pattern,
            target: target,
            raw_event: event
          stats.inc 'filter-scan-error'
          return event
        end

        if results.empty?
          stats.inc 'filter-scan-nomatch'
          event
        else
          event[target] ||= []
          event[target]  += results
          stats.inc 'filter-scan'
          filtered event, conf
        end
      end
    end
  end
end

Version data entries

1 entries across 1 versions & 1 rubygems

Version	Path
anschel-0.7.0	lib/anschel/filter/scan.rb