Module: ChronoForge::Executor::Methods::DurablyExecute

Included in:
ChronoForge::Executor::Methods
Defined in:
lib/chrono_forge/executor/methods/durably_execute.rb

Instance Method Summary collapse

Instance Method Details

#durably_execute(method, max_attempts: 3, name: nil) ⇒ nil

Executes a method with automatic retry logic and durable execution tracking.

This method provides fault-tolerant execution of instance methods with automatic retry on failure using exponential backoff. Each execution is tracked with its own execution log, ensuring idempotent behavior during workflow replays.

Behavior

Idempotency

Each execution gets a unique step name ensuring that workflow replays don’t create duplicate executions. If a workflow is replayed and this step has already completed, it will be skipped.

Retry Logic

  • Failed executions are automatically retried with exponential backoff

  • Backoff calculation: 2^attempt seconds (capped at 2^5 = 32 seconds)

  • After max_attempts, ExecutionFailedError is raised

Error Handling

  • All exceptions except HaltExecutionFlow are caught and handled

  • Errors are logged and tracked in the execution log

  • ExecutionFailedError is raised after exhausting all retry attempts

  • HaltExecutionFlow exceptions are re-raised to allow workflow control flow

Execution Logs

Creates execution log with step name: ‘durably_execute$#|| method`

  • Tracks attempt count, execution times, and completion status

  • Stores error details when failures occur

  • Enables monitoring and debugging of execution history

Examples:

Basic usage

durably_execute :send_welcome_email

With custom retry attempts

durably_execute :critical_payment_processing, max_attempts: 5

With custom name for tracking

durably_execute :complex_calculation, name: "phase_1_calculation"

Method that might fail temporarily

def upload_to_s3
  # This might fail due to network issues, rate limits, etc.
  S3Client.upload(file_path, bucket: 'my-bucket')
  Rails.logger.info "Successfully uploaded file to S3"
end

durably_execute :upload_to_s3, max_attempts: 5

Parameters:

  • method (Symbol) —

    The name of the instance method to execute

  • max_attempts (Integer) (defaults to: 3) —

    Maximum retry attempts before failing (default: 3)

  • name (String, nil) (defaults to: nil) —

    Custom name for the execution step. Defaults to method name. Used to create unique step names for execution logs.

Returns:

  • (nil)

Raises:



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# File 'lib/chrono_forge/executor/methods/durably_execute.rb', line 62

def durably_execute(method, max_attempts: 3, name: nil)
  step_name = "durably_execute$#{name || method}"
  # Find or create execution log
  execution_log = ExecutionLog.create_or_find_by!(
    workflow: @workflow,
    step_name: step_name
  ) do |log|
    log.started_at = Time.current
  end

  # Return if already completed
  return if execution_log.completed?

  # Execute with error handling
  begin
    # Update execution log with attempt
    execution_log.update!(
      attempts: execution_log.attempts + 1,
      last_executed_at: Time.current
    )

    # Execute the method
    send(method)

    # Complete the execution
    execution_log.update!(
      state: :completed,
      completed_at: Time.current
    )

    # return nil
    nil
  rescue HaltExecutionFlow
    raise
  rescue => e
    # Log the error
    Rails.logger.error { "Error while durably executing #{method}: #{e.message}" }
    self.class::ExecutionTracker.track_error(workflow, e)

    # Optional retry logic
    if execution_log.attempts < max_attempts
      # Reschedule with exponential backoff
      backoff = (2**[execution_log.attempts, 5].min).seconds

      self.class
        .set(wait: backoff)
        .perform_later(
          @workflow.key,
          retry_method: method
        )

      # Halt current execution
      halt_execution!
    else
      # Max attempts reached
      execution_log.update!(
        state: :failed,
        error_message: e.message,
        error_class: e.class.name
      )
      raise ExecutionFailedError, "#{step_name} failed after maximum attempts"
    end
  end
end