Class: Ocpp::Rails::Actions::StartTransactionHandler

Inherits:
Object
  • Object
show all
Defined in:
app/services/ocpp/rails/actions/start_transaction_handler.rb

Instance Method Summary collapse

Constructor Details

#initialize(charge_point, message_id, payload) ⇒ StartTransactionHandler

Returns a new instance of StartTransactionHandler.



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# File 'app/services/ocpp/rails/actions/start_transaction_handler.rb', line 5

def initialize(charge_point, message_id, payload)
  @charge_point = charge_point
  @message_id = message_id
  @payload = payload
end

Instance Method Details

#call ⇒ Object 



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# File 'app/services/ocpp/rails/actions/start_transaction_handler.rb', line 11

def call
  id_tag = @payload["idTag"]
  authorization = authorize(id_tag)

  unless authorization[:status] == "Accepted"
    ::Rails.logger.warn("[OCPP] StartTransaction from #{@charge_point.identifier} rejected for idTag #{id_tag}: #{authorization[:status]}")
    # OCPP 1.6 requires transactionId in the response; the station
    # must ignore it when the idTag was not accepted.
    return {
      "idTagInfo" => { "status" => authorization[:status] },
      "transactionId" => 0
    }
  end

  # A duplicate/replayed StartTransaction must not open a second
  # concurrent session on the connector; resume the open one instead.
  existing = active_session
  if existing
    ::Rails.logger.warn("[OCPP] StartTransaction from #{@charge_point.identifier}: Connector #{@payload['connectorId']} already has active transaction #{existing.transaction_id}, resuming it")
    return accepted_response(existing, authorization)
  end

  started_at = TimestampParser.parse(@payload["timestamp"])

  begin
    session = @charge_point.charging_sessions.create!(
      connector_id: @payload["connectorId"],
      id_tag: id_tag,
      start_meter_value: @payload["meterStart"],
      started_at: started_at.time,
      status: "Charging",
      metadata: session_metadata(started_at)
    )
  rescue ActiveRecord::RecordNotUnique
    # Lost a race against a concurrent StartTransaction; the winner's
    # session is the one to resume.
    session = active_session
    raise unless session
    return accepted_response(session, authorization)
  end

  ::Rails.logger.info("[OCPP] StartTransaction from #{@charge_point.identifier}: Connector #{@payload['connectorId']}, Transaction ID: #{session.transaction_id}")

  # Update charge point status
  @charge_point.update(status: "Charging")

  # Broadcast session started event for real-time UI updates
  broadcast_session_started(session)

  accepted_response(session, authorization)
end