How to use LruRedux cache in ruby filter

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1

Somehow we have some logs having duplicated events, we want to dedup the events using fingerprint and LRU cache in the logstash pipeline, So I write a ruby file

require "lru_redux"

def register(params)
    limit = params["size"]
    @processedEvents = LruRedux::TTL::ThreadSafeCache.new(limit, 3600 )
end

def filter(event)
	return [event]
end

When i try to load the script and test, logstash report :
he given configuration is invalid. Reason: Unable to configure plugins: (ScriptError) Error during load of '/Users/i337803/Workspaces/mcap/email-loganalyzer/email-loganalyzer-logstash/src/main/logstash/scripts/dedup.rb': #<NoMethodError: undefined method `<' for nil:NilClass>

I don't see the operator '<' in my file, What does this error complain about, I have no idea?

BTW, I see the Lru is already installed in the official Logstash package.

2

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