Class: SidekiqAutoscale::Middleware

Inherits:

Object

• Object
• SidekiqAutoscale::Middleware

Defined in:

lib/sidekiq_autoscale/middleware.rb

Constant Summary

LAST_SCALED_AT_EVENT_KEY =

"sidekiq_autoscaling:last_scaled_at"

SCALING_LOCK_KEY =

"sidekiq_autoscaling:scaling_lock"

LOG_TAG =

"[SIDEKIQ_SCALE][SCALING_EVENT]"

WORKER_COUNT_KEY =

"sidekiq_autoscaling/current_worker_count"

Instance Method Summary

• #call(_worker_class, job, _queue) { ... } ⇒ Void

Instance Method Details

#call(_worker_class, job, _queue) { ... } ⇒ Void

Parameters:

• worker (Object) —

  the worker instance

• job (Hash) —

  the full job payload

  • @see github.com/mperham/sidekiq/wiki/Job-Format

• queue (String) —

  the name of the queue the job was pulled from

Yields:

• the next middleware in the chain or worker `perform` method

Returns:

• (Void)

# File 'lib/sidekiq_autoscale/middleware.rb', line 16

def call(_worker_class, job, _queue)
  # In case the scaling strategy needs to record job-specific stuff before it runs
  SidekiqAutoscale.strategy_klass.log_job(job)
  yield # Run the job, THEN scale the cluster
  begin
    return unless SidekiqAutoscale.strategy_klass.workload_change_needed?(job)

    direction = SidekiqAutoscale.strategy_klass.scaling_direction(job)
    new_worker_count = worker_count + (SidekiqAutoscale.scale_by * direction)

    set_worker_count(new_worker_count, event_id: job["jid"], direction: direction)
  rescue StandardError => e
    SidekiqAutoscale.logger.error(e)
    SidekiqAutoscale.on_scaling_error(e)
  end
end