Class: Fluent::Plugin::PrometheusInput

Inherits:
Input
  • Object
show all
Defined in:
lib/fluent/plugin/in_prometheus.rb

Defined Under Namespace

Classes: MonitorServlet, MonitorServletAll

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ PrometheusInput

Returns a new instance of PrometheusInput.



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# File 'lib/fluent/plugin/in_prometheus.rb', line 41

def initialize
  super
  @registry = ::Prometheus::Client.registry
end

Instance Attribute Details

#base_port ⇒ Object (readonly)

Returns the value of attribute base_port.



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# File 'lib/fluent/plugin/in_prometheus.rb', line 38

def base_port
  @base_port
end

#metrics_path ⇒ Object (readonly)

Returns the value of attribute metrics_path.



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# File 'lib/fluent/plugin/in_prometheus.rb', line 39

def metrics_path
  @metrics_path
end

#num_workers ⇒ Object (readonly)

Returns the value of attribute num_workers.



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# File 'lib/fluent/plugin/in_prometheus.rb', line 37

def num_workers
  @num_workers
end

#registry ⇒ Object (readonly)

Returns the value of attribute registry.



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# File 'lib/fluent/plugin/in_prometheus.rb', line 35

def registry
  @registry
end

Instance Method Details

#configure(conf) ⇒ Object 



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# File 'lib/fluent/plugin/in_prometheus.rb', line 46

def configure(conf)
  super

  # Get how many workers we have
  sysconf = if self.respond_to?(:owner) && owner.respond_to?(:system_config)
              owner.system_config
            elsif self.respond_to?(:system_config)
              self.system_config
            else
              nil
            end
  @num_workers = sysconf && sysconf.workers ? sysconf.workers : 1

  @base_port = @port
  @port += fluentd_worker_id
end

#multi_workers_ready? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/fluent/plugin/in_prometheus.rb', line 63

def multi_workers_ready?
  true
end

#shutdown ⇒ Object 



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# File 'lib/fluent/plugin/in_prometheus.rb', line 110

def shutdown
  if @server
    @server.shutdown
    @server = nil
  end
  super
end

#start ⇒ Object 



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# File 'lib/fluent/plugin/in_prometheus.rb', line 67

def start
  super
  log.debug "listening prometheus http server on http://#{@bind}:#{@port}/#{@metrics_path} for worker#{fluentd_worker_id}"
  config = {
    BindAddress: @bind,
    Port: @port,
    MaxClients: 5,
    Logger: WEBrick::Log.new(STDERR, WEBrick::Log::FATAL),
    AccessLog: [],
  }
  unless @ssl.nil? || !@ssl['enable']
    require 'webrick/https'
    require 'openssl'
    if (@ssl['certificate_path'] && @ssl['private_key_path'].nil?) || (@ssl['certificate_path'].nil? && @ssl['private_key_path'])
        raise RuntimeError.new("certificate_path and private_key_path most both be defined")
    end
    ssl_config = {
        SSLEnable: true
    }
    if @ssl['certificate_path']
      cert = OpenSSL::X509::Certificate.new(File.read(@ssl['certificate_path']))
      ssl_config[:SSLCertificate] = cert
    end
    if @ssl['private_key_path']
      key = OpenSSL::PKey::RSA.new(File.read(@ssl['private_key_path']))
      ssl_config[:SSLPrivateKey] = key
    end
    ssl_config[:SSLCACertificateFile] = @ssl['ca_path'] if @ssl['ca_path']
    ssl_config = ssl_config.merge(@ssl['extra_conf'])
    config = ssl_config.merge(config)
  end
  @log.on_debug do
    @log.debug("WEBrick conf: #{config}")
  end

  @server = WEBrick::HTTPServer.new(config)
  @server.mount(@metrics_path, MonitorServlet, self)
  @server.mount(@aggregated_metrics_path, MonitorServletAll, self)
  thread_create(:in_prometheus) do
    @server.start
  end
end