Plugin Helper: Event Emitter

event_emitter helper introduces router method to the plugin.
Here is the code example with event_emitter helper:
require 'fluent/plugin/output'
​
module Fluent::Plugin
  class RelabelOutput < Output
    Fluent::Plugin.register_output('relabel', self)
    helpers :event_emitter
​
    def multi_workers_ready?
      true
    end
​
    def process(tag, es)
      router.emit_stream(tag, es)
    end
  end
end
Methods
router
This method returns Fluent::EventRouter instance
Code example:
# emit event
router.emit(tag, time, record)
​
# emit event stream
router.emit_stream(tag, es)
​
# emit error event
begin
  # do something
rescue => error
  # Route event to @ERROR label or
  # log error message when @ERROR label is not defined in configuration
  router.emit_error_event(tag, time, record, error)
end
event_emitter used plugins
All input plugins
All filter plugins
​Exec output​
​Relabel output​
​Copy output​
​Roundrobin output​
If this article is incorrect or outdated, or omits critical information, please let us know. Fluentd is a open source project under Cloud Native Computing Foundation (CNCF). All components are available under the Apache 2 License.
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