Class: LogStash::Agent

Inherits:
Object
  • Object
show all
Includes:
Util::Loggable
Defined in:
lib/logstash/agent.rb

Constant Summary collapse

STARTED_AT = 
Time.now.freeze

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods included from Util::Loggable

included, #slow_logger

Constructor Details

#initialize(settings = LogStash::SETTINGS) ⇒ Agent

initialize method for LogStash::Agent

Parameters:

  • params (Hash) —

    potential parameters are: :name [String] - identifier for the agent :auto_reload [Boolean] - enable reloading of pipelines :reload_interval [Integer] - reload pipelines every X seconds



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# File 'lib/logstash/agent.rb', line 33

def initialize(settings = LogStash::SETTINGS)
  @logger = self.class.logger
  @settings = settings
  @auto_reload = setting("config.reload.automatic")

  @pipelines = {}
  @name = setting("node.name")
  @http_host = setting("http.host")
  @http_port = setting("http.port")
  @http_environment = setting("http.environment")
  # Generate / load the persistent uuid
  id

  @config_loader = LogStash::Config::Loader.new(@logger)
  @reload_interval = setting("config.reload.interval")
  @upgrade_mutex = Mutex.new

  @collect_metric = setting("metric.collect")

  # Create the collectors and configured it with the library
  configure_metrics_collectors

  @reload_metric = metric.namespace([:stats, :pipelines])

  @dispatcher = LogStash::EventDispatcher.new(self)
  LogStash::PLUGIN_REGISTRY.hooks.register_emitter(self.class, dispatcher)
  dispatcher.fire(:after_initialize)
end

Instance Attribute Details

#dispatcher ⇒ Object (readonly)

Returns the value of attribute dispatcher.



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# File 'lib/logstash/agent.rb', line 25

def dispatcher
  @dispatcher
end

#logger ⇒ Object

Returns the value of attribute logger.



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# File 'lib/logstash/agent.rb', line 26

def logger
  @logger
end

#metric ⇒ Object (readonly)

Returns the value of attribute metric.



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# File 'lib/logstash/agent.rb', line 25

def metric
  @metric
end

#name ⇒ Object (readonly)

Returns the value of attribute name.



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# File 'lib/logstash/agent.rb', line 25

def name
  @name
end

#pipelines ⇒ Object (readonly)

Returns the value of attribute pipelines.



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# File 'lib/logstash/agent.rb', line 25

def pipelines
  @pipelines
end

#settings ⇒ Object (readonly)

Returns the value of attribute settings.



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# File 'lib/logstash/agent.rb', line 25

def settings
  @settings
end

#webserver ⇒ Object (readonly)

Returns the value of attribute webserver.



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# File 'lib/logstash/agent.rb', line 25

def webserver
  @webserver
end

Instance Method Details

#execute ⇒ Object 



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# File 'lib/logstash/agent.rb', line 62

def execute
  @thread = Thread.current # this var is implicilty used by Stud.stop?
  @logger.debug("starting agent")

  start_pipelines
  start_webserver

  return 1 if clean_state?

  Stud.stoppable_sleep(@reload_interval) # sleep before looping

  if @auto_reload
    Stud.interval(@reload_interval) { reload_state! }
  else
    while !Stud.stop?
      if clean_state? || running_pipelines?
        sleep 0.5
      else
        break
      end
    end
  end
end

#id ⇒ Object 



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# File 'lib/logstash/agent.rb', line 141

def id
  return @id if @id

  uuid = nil
  if ::File.exists?(id_path)
    begin
      uuid = ::File.open(id_path) {|f| f.each_line.first.chomp }
    rescue => e
      logger.warn("Could not open persistent UUID file!",
                  :path => id_path,
                  :error => e.message,
                  :class => e.class.name)
    end
  end

  if !uuid
    uuid = SecureRandom.uuid
    logger.info("No persistent UUID file found. Generating new UUID",
                :uuid => uuid,
                :path => id_path)
    begin
      ::File.open(id_path, 'w') {|f| f.write(uuid) }
    rescue => e
      logger.warn("Could not write persistent UUID file! Will use ephemeral UUID",
                  :uuid => uuid,
                  :path => id_path,
                  :error => e.message,
                  :class => e.class.name)
    end
  end

  @id = uuid
end

#id_path ⇒ Object 



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# File 'lib/logstash/agent.rb', line 175

def id_path
  @id_path ||= ::File.join(settings.get("path.data"), "uuid")
end

#register_pipeline(pipeline_id, settings = @settings) ⇒ Object

register_pipeline - adds a pipeline to the agent’s state

Parameters:

  • pipeline_id (String) —

    pipeline string identifier

  • settings (Hash) (defaults to: @settings) —

    settings that will be passed when creating the pipeline. keys should be symbols such as :pipeline_workers and :pipeline_batch_delay



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# File 'lib/logstash/agent.rb', line 90

def register_pipeline(pipeline_id, settings = @settings)
  pipeline_settings = settings.clone
  pipeline_settings.set("pipeline.id", pipeline_id)

  pipeline = create_pipeline(pipeline_settings)
  return unless pipeline.is_a?(LogStash::Pipeline)
  if @auto_reload && pipeline.non_reloadable_plugins.any?
    @logger.error(I18n.t("logstash.agent.non_reloadable_config_register"),
                  :pipeline_id => pipeline_id,
                  :plugins => pipeline.non_reloadable_plugins.map(&:class))
    return
  end
  @pipelines[pipeline_id] = pipeline
end

#reload_state! ⇒ Object 



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# File 'lib/logstash/agent.rb', line 105

def reload_state!
  @upgrade_mutex.synchronize do
    @pipelines.each do |pipeline_id, pipeline|
      next if pipeline.settings.get("config.reload.automatic") == false
      begin
        reload_pipeline!(pipeline_id)
      rescue => e
        @reload_metric.namespace([pipeline_id.to_sym, :reloads]).tap do |n|
          n.increment(:failures)
          n.gauge(:last_error, { :message => e.message, :backtrace => e.backtrace})
          n.gauge(:last_failure_timestamp, LogStash::Timestamp.now)
        end
        @logger.error(I18n.t("oops"), :message => e.message, :class => e.class.name, :backtrace => e.backtrace)
      end
    end
  end
end

#running_pipelines? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/logstash/agent.rb', line 179

def running_pipelines?
  @upgrade_mutex.synchronize do
    @pipelines.select {|pipeline_id, _| running_pipeline?(pipeline_id) }.any?
  end
end

#shutdown ⇒ Object 



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# File 'lib/logstash/agent.rb', line 135

def shutdown
  stop_collecting_metrics
  stop_webserver
  shutdown_pipelines
end

#stop_collecting_metrics ⇒ Object 



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# File 'lib/logstash/agent.rb', line 130

def stop_collecting_metrics
  @collector.stop
  @periodic_pollers.stop
end

#uptime ⇒ Fixnum

Calculate the Logstash uptime in milliseconds

Returns:

  • (Fixnum) —

    Uptime in milliseconds



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# File 'lib/logstash/agent.rb', line 126

def uptime
  ((Time.now.to_f - STARTED_AT.to_f) * 1000.0).to_i
end