Class: CheckGraphite::Command

Inherits:
Object
  • Object
show all
Includes:
NagiosCheck
Defined in:
lib/check_graphite.rb

Instance Method Summary collapse

Instance Method Details

#check ⇒ Object 



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# File 'lib/check_graphite.rb', line 24

def check
  uri = URI(URI.encode("#{options.endpoint}?target=#{options.metric}&from=-#{options.from}&format=json"))
  req = Net::HTTP::Get.new(uri.request_uri)

  # use basic auth if username is set
  if options.username
    req.basic_auth options.username, options.password
  end

  res = Net::HTTP.start(uri.host, uri.port, :use_ssl => 'https' == uri.scheme) { |http|
    http.request(req)
  }

  raise "HTTP error code #{res.code}" unless res.code == "200"
  raise "no data returned for target" if res.body == "[]"

  datapoints = JSON(res.body).map { |e| e["datapoints"] }.reduce { |a, b| a + b }
  datapoints = datapoints.slice(
    options.dropfirst,
    (datapoints.size - options.dropfirst - options.droplast)
  )

  # Remove NULL values. Return UNKNOWN if there's nothing left.
  datapoints.reject! { |v| v.first.nil? }
  raise "no valid datapoints" if datapoints.size == 0

  sum = datapoints.reduce(0.0) {|acc, v| acc + v.first }
  value = sum / datapoints.size
  store_value options.name, value
  store_message "#{options.name}=#{value}"
end