Class: MemcacheSniffer

Inherits:
Object
  • Object
show all
Defined in:
lib/sniffer.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(config) ⇒ MemcacheSniffer

Returns a new instance of MemcacheSniffer.



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# File 'lib/sniffer.rb', line 7

def initialize(config)
    @source    = config[:nic]
    @port      = config.has_key?(:port) ? config[:port] : 11211

    @metrics = {}
    @metrics[:calls]   = {}
    @metrics[:objsize] = {}
    @metrics[:reqsec]  = {}
    @metrics[:bw]      = {}
    @metrics[:stats]   = { :recv => 0, :drop => 0 }

    @semaphore = Mutex.new
end

Instance Attribute Details

#metrics ⇒ Object

Returns the value of attribute metrics.



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# File 'lib/sniffer.rb', line 5

def metrics
  @metrics
end

#semaphore ⇒ Object

Returns the value of attribute semaphore.



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# File 'lib/sniffer.rb', line 5

def semaphore
  @semaphore
end

Instance Method Details

#done ⇒ Object 



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# File 'lib/sniffer.rb', line 54

def done
    @done = true
end

#start ⇒ Object 



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# File 'lib/sniffer.rb', line 21

def start
    cap = Pcap::Capture.open_live(@source, 1500)

    @metrics[:start_time] = Time.new.to_f

    @done      = false

    cap.setfilter("port #{@port}")
    cap.loop do |packet|
        @metrics[:stats] = cap.stats

        # parse key name, and size from VALUE responses
        if packet.raw_data =~ /VALUE (\S+) \S+ (\S+)/
            key   = $1
            bytes = $2

            @semaphore.synchronize do
                if @metrics[:calls].has_key?(key)
                    @metrics[:calls][key] += 1
                else
                    @metrics[:calls][key] = 1
                end

                @metrics[:objsize][key] = bytes.to_i
            end
        end

        break if @done
    end

    cap.close
end