Class: LogStash::Filters::Checksum

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

Overview

This filter let’s you create a checksum based on various parts of the logstash event. This can be useful for deduplication of messages or simply to provide a custom unique identifier.

This is VERY experimental and is largely a proof-of-concept

Constant Summary collapse

ALGORITHMS = 
["md5", "sha", "sha1", "sha256", "sha384",]

Instance Method Summary collapse

Instance Method Details

#filter(event) ⇒ Object 



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# File 'lib/logstash/filters/checksum.rb', line 31

def filter(event)
  
  to_checksum = ""

  @logger.debug("Running checksum filter", :event => event)

  @keys.sort.each do |k|
    @logger.debug("Adding key to string", :current_key => k)
    to_checksum << "#{event.get(k)}"
  end
  @logger.debug("Final string built", :to_checksum => to_checksum)


  # in JRuby 1.7.11 outputs as ASCII-8BIT
  digested_string = OpenSSL::Digest.hexdigest(@algorithm, to_checksum).force_encoding(Encoding::UTF_8)

  @logger.debug("Digested string", :digested_string => digested_string)
  event.set('logstash_checksum', digested_string)
end

#register ⇒ Object 



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# File 'lib/logstash/filters/checksum.rb', line 26

def register
  require 'openssl'
end