Class: Ductwork::Job

Inherits:
Record
  • Object
show all
Defined in:
app/models/ductwork/job.rb

Overview

rubocop:todo Metrics/ClassLength

Constant Summary collapse

FAILED_EXECUTION_TIMEOUT = 
10.seconds

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from Record

table_name_prefix

Class Method Details

.claim_latest(klass) ⇒ Object

rubocop:todo Metrics/MethodLength



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# File 'app/models/ductwork/job.rb', line 14

def self.claim_latest(klass) # rubocop:todo Metrics/MethodLength
  process_id = ::Process.pid
  id = Ductwork::Availability
       .joins(execution: { job: { step: :pipeline } })
       .where("ductwork_availabilities.started_at <= ?", Time.current)
       .where(completed_at: nil)
       .where(ductwork_pipelines: { klass: })
       .order(:created_at)
       .limit(1)
       .pluck(:id)
       .first

  if id.present?
    # TODO: probably makes sense to use SQL here instead of relying
    # on ActiveRecord to construct the correct `UPDATE` query
    rows_updated = nil
    Ductwork::Record.transaction do
      rows_updated = Ductwork::Availability
                     .where(id: id, completed_at: nil)
                     .update_all(completed_at: Time.current, process_id: process_id)
      Ductwork::Execution
        .joins(:availability)
        .where(completed_at: nil)
        .where(ductwork_availabilities: { id: })
        .update_all(process_id:)
    end

    if rows_updated == 1
      Ductwork.logger.debug(
        msg: "Job claimed",
        role: :job_worker,
        process_id: process_id,
        availability_id: id
      )
      Ductwork::Job
        .joins(executions: :availability)
        .find_by(ductwork_availabilities: { id:, process_id: })
    else
      Ductwork.logger.debug(
        msg: "Did not claim job, avoided race condition",
        role: :job_worker,
        process_id: process_id,
        availability_id: id
      )
      nil
    end
  end
end

.enqueue(step, args) ⇒ Object 



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# File 'app/models/ductwork/job.rb', line 63

def self.enqueue(step, args)
  job = Ductwork::Record.transaction do
    j = step.create_job!(
      klass: step.klass,
      started_at: Time.current,
      input_args: JSON.dump({ args: })
    )
    execution = j.executions.create!(
      started_at: Time.current,
      retry_count: 0
    )
    execution.create_availability!(
      started_at: Time.current
    )

    j
  end

  Ductwork.logger.info(
    msg: "Job enqueued",
    job_id: job.id,
    job_klass: job.klass
  )

  job
end

Instance Method Details

#execute(pipeline) ⇒ Object 



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# File 'app/models/ductwork/job.rb', line 90

def execute(pipeline)
  # i don't _really_ like this, but it should be fine for now...
  execution = executions.order(:created_at).last
  Ductwork.logger.debug(
    msg: "Executing job",
    role: :job_worker,
    pipeline: pipeline,
    job_klass: klass
  )
  args = JSON.parse(input_args)["args"]
  instance = Object.const_get(klass).new(args)
  run = execution.create_run!(
    started_at: Time.current
  )
  result = nil

  begin
    output_payload = instance.execute
    execution_succeeded!(execution, run, output_payload)
    result = "success"
  rescue StandardError => e
    execution_failed!(execution, run, e)
    result = "failure"
  ensure
    Ductwork.logger.info(
      msg: "Job executed",
      pipeline: pipeline,
      job_id: id,
      job_klass: klass,
      result: result,
      role: :job_worker
    )
  end
end

#return_value ⇒ Object 



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# File 'app/models/ductwork/job.rb', line 125

def return_value
  if output_payload.present?
    JSON.parse(output_payload).fetch("payload", nil)
  end
end