Class: LogStash::Filters::CacheRedis

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

Instance Method Summary collapse

Instance Method Details

#filter(event) ⇒ Object 



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# File 'lib/logstash/filters/cache_redis.rb', line 89

def filter(event)

    # TODO: Maybe refactor the interface into a more flexible one with two
    #       main configs 'cmd' & 'args'. Then it would be possible to eliminate
    #       all if clauses and replace it through one hashmap call, where
    #       the hashmap would be a mapping from 'cmd' -> <cmd_function_ref>
    #       E.q.: cmds.fetch(event.get(@llen), &method(:cmd_not_found_err))

    begin
        @redis ||= connect

        if @llen
            event.set(@target, @redis.llen(event.get(@llen)))
        end

        if @rpush
            @redis.rpush(event.get(@rpush), event.get(@source))
        end

        if @rpushnx
            key = event.get(@rpushnx)
            begin
                @lock_manager ||= connect_lockmanager
                @lock_manager.lock!("lock_#{key}", @lock_timeout) do
                    @redis.rpush(key, event.get(@source)) unless @redis.exists(key)
                end
            rescue Redlock::LockError => e
                @logger.warn("Failed to lock section 'rpushnx' for key: #{key}",
                             :event => event, :exception => e)
                @lock_manager = nil
                retry
            end
        end

        if @rpop
            event.set(@target, @redis.rpop(event.get(@rpop)))
        end

        if @lget
            event.set(@target, @redis.lrange(event.get(@lget), 0, -1))
        end

    rescue => e
        @logger.warn("Failed to send event to Redis", :event => event,
                     :exception => e, :backtrace => e.backtrace)
        sleep @reconnect_interval
        @redis = nil
        @lock_manager = nil
        retry
    end

    # filter_matched should go in the last line of our successful code
    filter_matched(event)
end

#register ⇒ Object 



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# File 'lib/logstash/filters/cache_redis.rb', line 79

def register
    @redis = nil
    @lock_manager = nil
    if @shuffle_hosts
        @host.shuffle!
    end
    @host_idx = 0
end