Class: SensuPluginsGraphite::GraphiteProxy::Proxy

Inherits:
Object
  • Object
show all
Defined in:
lib/sensu-plugins-graphite/graphite_proxy/proxy.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(config) ⇒ Proxy

Returns a new instance of Proxy.



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# File 'lib/sensu-plugins-graphite/graphite_proxy/proxy.rb', line 17

def initialize(config)
  self.config = config
end

Instance Attribute Details

#config ⇒ Object

Returns the value of attribute config.



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# File 'lib/sensu-plugins-graphite/graphite_proxy/proxy.rb', line 15

def config
  @config
end

Instance Method Details

#derive_password(given_opts) ⇒ Object 



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# File 'lib/sensu-plugins-graphite/graphite_proxy/proxy.rb', line 46

def derive_password(given_opts)
  if given_opts[:passfile]
    File.open(given_opts[:passfile]).readline
  elsif given_opts[:password]
    given_opts[:password]
  end
end

#format_output(data) ⇒ Object 



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# File 'lib/sensu-plugins-graphite/graphite_proxy/proxy.rb', line 54

def format_output(data)
  output = {}

  data.each do |raw|
    unless raw['datapoints'].empty?
      line = output_line(raw)
      output[line['target']] = line
    end
  end
  output
end

#formatted_target ⇒ Object 



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# File 'lib/sensu-plugins-graphite/graphite_proxy/proxy.rb', line 21

def formatted_target
  if config[:target].include?('$')
    require 'socket'
    formatted = Socket.gethostbyname(Socket.gethostname).first.gsub('.', config[:hostname_sub] || '_')
    config[:target].gsub('$', formatted)
  else
    URI.escape config[:target]
  end
end

#output_line(raw) ⇒ Object 



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# File 'lib/sensu-plugins-graphite/graphite_proxy/proxy.rb', line 66

def output_line(raw)
  raw['datapoints'].delete_if { |v| v.first.nil? }
  target = raw['target']
  data = raw['datapoints'].map(&:first)
  start = raw['datapoints'].first.last
  dend = raw['datapoints'].last.last
  step = ((dend - start) / raw['datapoints'].size.to_f).ceil

  { 'target' => target, 'data' => data, 'start' => start, 'end' => dend, 'step' => step }
end

#request_auth_options(given_opts) ⇒ Object 



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# File 'lib/sensu-plugins-graphite/graphite_proxy/proxy.rb', line 31

def request_auth_options(given_opts)
  url_opts = {}

  url_opts[:ssl_verify_mode] = OpenSSL::SSL::VERIFY_NONE if given_opts[:no_ssl_verify]

  if given_opts[:username]
    pass = derive_password(given_opts)
    url_opts[:http_basic_authentication] = [given_opts[:username], pass.chomp]
  end # we don't have both username and password trying without

  url_opts['Authorization'] = "Bearer #{given_opts[:auth]}" if given_opts[:auth]

  url_opts
end

#retrieve_data! ⇒ Object

grab data from graphite



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# File 'lib/sensu-plugins-graphite/graphite_proxy/proxy.rb', line 78

def retrieve_data!
  unless @raw_data
    begin
      unless config[:server].start_with?('https://', 'http://')
        config[:server].prepend('http://')
      end

      url = "#{config[:server]}/render?format=json&target=#{formatted_target}&from=#{config[:from]}"

      handle = open(url, request_auth_options(config))

      @raw_data = handle.gets
      if @raw_data == '[]'
        unknown 'Empty data received from Graphite - metric probably doesn\'t exists'
      else
        json_data = JSON.parse(@raw_data)
        format_output(json_data)
      end
    rescue OpenURI::HTTPError => e
      raise ProxyError.new('Failed to connect to graphite server', exception: e)
    rescue NoMethodError => e
      raise ProxyError.new('No data for time period and/or target', exception: e)
    rescue Errno::ECONNREFUSED => e
      raise ProxyError.new('Connection refused when connecting to graphite server', exception: e)
    rescue Errno::ECONNRESET => e
      raise ProxyError.new('Connection reset by peer when connecting to graphite server', exception: e)
    rescue EOFError => e
      raise ProxyError.new('End of file error when reading from graphite server', exception: e)
    rescue => e
      raise ProxyError.new("An unknown error occured: #{e.inspect}", exception: e)
    end
  end
end