CODEWITHSUNDEEP
logstashlogstash-configuration
kitz
kitz

Reputation: 889

Use ruby variable in logstash filter condition

I have the following logstash config:

input { stdin { } }

output {
  elasticsearch { hosts => ["localhost:9200"] }
  stdout { codec => rubydebug }
}

filter {


  ruby {
    code => "
      @@exists_pattern = ['foo', 'bar'].any?{ |pattern| event.get('message').include?(pattern) }
      event.add('keep_line', @@exists_pattern)
    "
  }


  if not [keep_line] { drop { } }


  grok {
    match => {
      "message" => '%{IP:serverip} \[%{HTTPDATE:my_timestamp}\]'
    }
  }

  date {
    match => [ "my_timestamp", "dd/MMM/YYYY:HH:mm:ss Z"]
    target => "@timestamp"
  }
}

But when I try to run logstash with this config file I get this error:

[ERROR][logstash.agent] Cannot create pipeline {:reason=>"Expected one of #, ( at line 30, column 10 (byte 923) after filter {\n  # grok...

How can I do to use the variable that was set in ruby code block (event['keep_line']) in an if instruction?

Upvotes: 2

Views: 1028

Answers (1)

Andrei Madalin Butnaru
Andrei Madalin Butnaru

Reputation: 4114

You cannot use negation in if conditions in Logstash filter. Try to convert boolean condition to be positive.

Upvotes: 2

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