Class: Mongodb::Graphite::Agent::Runner

Inherits:
Object
  • Object
show all
Defined in:
lib/mongodb/graphite/agent.rb

Instance Method Summary collapse

Constructor Details

#initialize(opts) ⇒ Runner

Returns a new instance of Runner.



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# File 'lib/mongodb/graphite/agent.rb', line 19

def initialize(opts)
  @opts = opts
end

Instance Method Details

#calculate_opcounters_per_second(opcounters) ⇒ Object 



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# File 'lib/mongodb/graphite/agent.rb', line 56

def calculate_opcounters_per_second(opcounters)
  current_sample = OpCountersSample.new Hash[opcounters]
  previous_sample = current_sample.dup
  result = {}

  if File.exist? 'lastsample'
    File.open('lastsample', 'r') do |file|
      previous_sample = Marshal.load(file)
    end
  end

  delta = TimeDifference.between(Time.parse(current_sample.sample_time), Time.parse(previous_sample.sample_time))
  puts "Last sample was taken #{delta.in_seconds.round(0)} seconds ago"

  previous_sample.values.keys.sort.each do |k|
    previous_sample_value = previous_sample.values[k]
    current_sample_value = current_sample.values[k]
    value_per_seconds = ((current_sample_value - previous_sample_value) / delta.in_seconds).round(2)
    result["#{k}_per_seconds"] = value_per_seconds
  end

  File.open('lastsample', 'w') do |file|
    Marshal.dump(current_sample, file)
  end

  result
end

#run ⇒ Object 



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# File 'lib/mongodb/graphite/agent.rb', line 23

def run
  connection = Mongo::MongoClient.new(@opts[:mongodb_host], @opts[:mongodb_port], :slave_ok => true)
  unless (@opts[:mongodb_username].blank? && @opts[:mongodb_password].blank?)
    connection["admin"].authenticate(@opts.mongodb_username, @opts.mongodb_password)
  end

  server_status_result = connection["local"].command('serverStatus' => 1)
  metric_hash = Utils.to_hash(server_status_result).select { |k|
    k.match('^connection|^network\.|^cursors|^mem\.mapped|^indexCounters|^repl.oplog')
  }

  opcounters_per_second_metric_hash = calculate_opcounters_per_second server_status_result["opcounters"]
  total_collections_hash = CollectionSizeCalculator.new(connection).calculate

  if @opts[:verbose]
    puts "Calculating metrics..."
    ap metric_hash
    ap opcounters_per_second_metric_hash
    ap total_collections_hash
  end


  unless (@opts[:dry_run])
    graphite_writer = GraphiteWriter.new({:host => @opts[:graphite_host],
                                          :port => @opts[:graphite_port],
                                          :verbose => @opts[:verbose],
                                          :metrics_prefix => @opts[:graphite_metrics_prefix]})
    graphite_writer.write(metric_hash)
    graphite_writer.write(opcounters_per_second_metric_hash)
    graphite_writer.write(total_collections_hash)
  end
end