Class: LogStash::PipelineAction::Reload

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

Instance Method Summary collapse

Methods inherited from Base

#<=>, #execution_priority, #inspect

Constructor Details

#initialize(pipeline_config, metric) ⇒ Reload

Returns a new instance of Reload.



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# File 'lib/logstash/pipeline_action/reload.rb', line 10

def initialize(pipeline_config, metric)
  @pipeline_config = pipeline_config
  @metric = metric
end

Instance Method Details

#execute(agent, pipelines_registry) ⇒ Object 



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# File 'lib/logstash/pipeline_action/reload.rb', line 23

def execute(agent, pipelines_registry)
  old_pipeline = pipelines_registry.get_pipeline(pipeline_id)

  if old_pipeline.nil?
    return LogStash::ConvergeResult::FailedAction.new("Cannot reload pipeline, because the pipeline does not exist")
  end

  if !old_pipeline.reloadable?
    return LogStash::ConvergeResult::FailedAction.new("Cannot reload pipeline, because the existing pipeline is not reloadable")
  end

  begin
    pipeline_validator =
      if @pipeline_config.settings.get_value("pipeline.java_execution")
        LogStash::JavaBasePipeline.new(@pipeline_config, nil, logger, nil)
      else
        agent.exclusive do
          # The Ruby pipeline initialization is not thread safe because of the module level
          # shared state in LogsStash::Config::AST. When using multiple pipelines this gets
          # executed simultaneously in different threads and we need to synchronize this initialization.
          LogStash::BasePipeline.new(@pipeline_config)
        end
      end
  rescue => e
    return LogStash::ConvergeResult::FailedAction.from_exception(e)
  end

  if !pipeline_validator.reloadable?
    return LogStash::ConvergeResult::FailedAction.new("Cannot reload pipeline, because the new pipeline is not reloadable")
  end

  logger.info("Reloading pipeline", "pipeline.id" => pipeline_id)

  success = pipelines_registry.reload_pipeline(pipeline_id) do
    # important NOT to explicitly return from block here
    # the block must emit a success boolean value

    # First shutdown old pipeline
    old_pipeline.shutdown { LogStash::ShutdownWatcher.start(old_pipeline) }
    old_pipeline.thread.join

    # Then create a new pipeline
    new_pipeline =
      if @pipeline_config.settings.get_value("pipeline.java_execution")
        LogStash::JavaPipeline.new(@pipeline_config, @metric, agent)
      else
        agent.exclusive do
          # The Ruby pipeline initialization is not thread safe because of the module level
          # shared state in LogsStash::Config::AST. When using multiple pipelines this gets
          # executed simultaneously in different threads and we need to synchronize this initialization.
          LogStash::Pipeline.new(@pipeline_config, @metric, agent)
        end
      end

    success = new_pipeline.start # block until the pipeline is correctly started or crashed

    # return success and new_pipeline to registry reload_pipeline
    [success, new_pipeline]
  end

  LogStash::ConvergeResult::ActionResult.create(self, success)
end

#pipeline_id ⇒ Object 



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# File 'lib/logstash/pipeline_action/reload.rb', line 15

def pipeline_id
  @pipeline_config.pipeline_id
end

#to_s ⇒ Object 



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# File 'lib/logstash/pipeline_action/reload.rb', line 19

def to_s
  "PipelineAction::Reload<#{pipeline_id}>"
end