Class: LogStash::Filters::Grokdiscovery

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

Instance Attribute Summary

Attributes inherited from Base

#logger

Instance Method Summary collapse

Methods inherited from Base

#add_config

Constructor Details

#initialize(config = {}) ⇒ Grokdiscovery

Returns a new instance of Grokdiscovery.



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# File 'lib/logstash/filters/grokdiscovery.rb', line 8

def initialize(config = {})
  super

  @discover_fields = {}
end

Instance Method Details

#filter(event) ⇒ Object 



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# File 'lib/logstash/filters/grokdiscovery.rb', line 30

def filter(event)
  # parse it with grok
  message = event.message
  match = false

  if event.type and @discover_fields.include?(event.type)
    discover = @discover_fields[event.type] & event.fields.keys
    discover.each do |field|
      value = event.fields[field]
      value = [value] if value.is_a?(String)

      value.each do |v| 
        pattern = @grok.discover(v)
        @logger.warn("Trying #{v} => #{pattern}")
        @grok.compile(pattern)
        match = @grok.match(v)
        if match
          @logger.warn(["Match", match.captures])
          event.fields.merge!(match.captures) do |key, oldval, newval|
            @logger.warn(["Merging #{key}", oldval, newval])
            oldval + newval # should both be arrays...
          end
        else
          @logger.warn(["Discovery produced something not matchable?", { :input => v }])
        end
      end # value.each
    end # discover.each
  else
    @logger.info("Unknown type for #{event.source} (type: #{event.type})")
    @logger.debug(event.to_hash)
  end
  @logger.debug(["Event now: ", event.to_hash])
end

#register ⇒ Object 



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# File 'lib/logstash/filters/grokdiscovery.rb', line 15

def register
  # TODO(sissel): Make patterns files come from the config
  @config.each do |type, typeconfig|
    @logger.debug("Registering type with grok: #{type}")
    @grok = Grok.new
    Dir.glob("patterns/*").each do |path|
      @grok.add_patterns_from_file(path)
    end
    @discover_fields[type] = typeconfig
    @logger.debug(["Enabling discovery", { :type => type, :fields => typeconfig }])
    @logger.warn(@discover_fields)
  end # @config.each
end