Class: SolidFlow::Replay

Inherits:
Object
  • Object
show all
Defined in:
lib/solid_flow/replay.rb

Defined Under Namespace

Classes: AwaitingState, Event, ExecutionState, State, StepState, TaskState, TimerState

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(workflow_class:, events:, execution_record:) ⇒ Replay

Returns a new instance of Replay.



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# File 'lib/solid_flow/replay.rb', line 112

def initialize(workflow_class:, events:, execution_record:)
  @workflow_class = workflow_class
  @events = Array(events)
  @execution_record = execution_record
end

Instance Attribute Details

#events ⇒ Object (readonly)

Returns the value of attribute events.



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# File 'lib/solid_flow/replay.rb', line 110

def events
  @events
end

#execution_record ⇒ Object (readonly)

Returns the value of attribute execution_record.



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# File 'lib/solid_flow/replay.rb', line 110

def execution_record
  @execution_record
end

#workflow_class ⇒ Object (readonly)

Returns the value of attribute workflow_class.



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# File 'lib/solid_flow/replay.rb', line 110

def workflow_class
  @workflow_class
end

Instance Method Details

#call ⇒ Object 



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# File 'lib/solid_flow/replay.rb', line 118

def call
  execution_state = ExecutionState.new(
    id: execution_record.fetch(:id),
    workflow: execution_record.fetch(:workflow),
    state: execution_record.fetch(:state),
    cursor_step: execution_record[:cursor_step]&.to_sym,
    cursor_index: execution_record[:cursor_index] || 0,
    graph_signature: execution_record[:graph_signature],
    metadata: execution_record[:metadata] || {}
  )

  ctx = (execution_record[:ctx] || {}).with_indifferent_access

  step_states = {}
  workflow_class.steps.each do |step|
    step_states[step.name] = StepState.new(
      name: step.name,
      status: :idle,
      attempt: 0,
      last_result: nil,
      last_error: nil,
      idempotency_key: nil,
      wait_instructions: []
    )
  end

  task_states = {}
  timer_states = {}
  signal_buffer = Signals::Buffer.new
  awaiting = nil

  events.each do |event|
    type = event.type.to_sym
    raw_payload = event.payload || {}
    payload = raw_payload.is_a?(Hash) ? raw_payload.deep_symbolize_keys : raw_payload

    case type
    when :workflow_started
      ctx.merge!(payload[:input] || {})
    when :step_waiting
      step = payload.fetch(:step).to_sym
      instructions = Array(payload[:instructions]).map do |inst|
        inst.deep_symbolize_keys
      end
      awaiting = AwaitingState.new(step:, instructions:)
      if step_states[step]
        step_states[step].status = :waiting
        step_states[step].wait_instructions = instructions
      end
    when :step_completed
      step = payload.fetch(:step).to_sym
      step_state = step_states[step]
      if step_state
        step_state.status = :completed
        step_state.wait_instructions = []
        step_state.last_result = payload[:result]
        step_state.last_error = nil
        step_state.attempt = payload[:attempt] if payload.key?(:attempt)
        step_state.idempotency_key = payload[:idempotency_key]
      end
      ctx.merge!(payload[:ctx_snapshot] || {})
      awaiting = nil if awaiting&.step == step
    when :task_scheduled
      step = payload.fetch(:step).to_sym
      task_states[step] = TaskState.new(
        step:,
        status: :scheduled,
        attempt: payload[:attempt] || 1,
        idempotency_key: payload[:idempotency_key],
        last_result: nil,
        last_error: nil
      )
      if step_states[step]
        step_states[step].status = :task_scheduled
        step_states[step].attempt = payload[:attempt] || 1
        step_states[step].idempotency_key = payload[:idempotency_key]
      end
    when :task_completed
      step = payload.fetch(:step).to_sym
      task_state = task_states[step] ||= TaskState.new(step:, status: :scheduled, attempt: 0, idempotency_key: nil, last_result: nil, last_error: nil)
      task_state.status = :completed
      task_state.attempt = payload[:attempt] || task_state.attempt
      task_state.last_result = payload[:result]
      task_state.last_error = nil
      if step_states[step]
        step_states[step].status = :completed
        step_states[step].last_result = payload[:result]
        step_states[step].last_error = nil
        step_states[step].attempt = task_state.attempt
      end
      ctx.merge!(payload[:ctx_snapshot] || {})
    when :task_failed
      step = payload.fetch(:step).to_sym
      task_state = task_states[step] ||= TaskState.new(step:, status: :scheduled, attempt: 0, idempotency_key: nil, last_result: nil, last_error: nil)
      task_state.status = :failed
      task_state.attempt = payload[:attempt] || task_state.attempt
      task_state.last_error = payload[:error]
      if step_states[step]
        step_states[step].status = :failed
        step_states[step].last_error = payload[:error]
        step_states[step].attempt = task_state.attempt
      end
    when :timer_scheduled
      timer_states[payload.fetch(:timer_id)] = TimerState.new(
        id: payload.fetch(:timer_id),
        step: payload[:step]&.to_sym,
        run_at: payload[:run_at],
        status: :scheduled,
        metadata: payload[:metadata]
      )
    when :timer_fired
      timer = timer_states[payload.fetch(:timer_id)]
      timer.status = :fired if timer
    when :signal_received
      signal_buffer.push(Signals::Message.new(
                           name: payload.fetch(:signal).to_sym,
                           payload: payload[:payload],
                           metadata: payload[:metadata],
                           received_at: payload[:received_at],
                           consumed: false
                         ))
    when :signal_consumed
      signal_buffer.consume(payload.fetch(:signal))
    when :workflow_completed, :workflow_failed, :workflow_cancelled
      execution_state.state = type.to_s.sub("workflow_", "")
    end
  end

  State.new(
    execution_state:,
    ctx:,
    history: events,
    step_states:,
    awaiting:,
    task_states:,
    timer_states:,
    signal_buffer:
  )
end