def lambda_handler()

in src/backend/booking/src/confirm-booking/confirm.py [0:0]

• 18 lines of code
• 3 McCabe index (conditional complexity)

def lambda_handler(event, context):
    """AWS Lambda Function entrypoint to confirm booking

    Parameters
    ----------
    event: dict, required
        Step Functions State Machine event

        bookingId: string
            Unique Booking ID of an unconfirmed booking

    context: object, required
        Lambda Context runtime methods and attributes
        Context doc: https://docs.aws.amazon.com/lambda/latest/dg/python-context-object.html

    Returns
    -------
    string
        bookingReference generated

    Raises
    ------
    BookingConfirmationException
        Booking Confirmation Exception including error message upon failure
    """
    booking_id = event.get("bookingId")
    if not booking_id:
        metrics.add_metric(name="InvalidConfirmationRequest", unit=MetricUnit.Count, value=1)
        logger.error({"operation": "input_validation", "details": event})
        raise ValueError("Invalid booking ID")

    try:
        logger.debug(f"Confirming booking - {booking_id}")
        ret = confirm_booking(booking_id)

        metrics.add_metric(name="SuccessfulBooking", unit=MetricUnit.Count, value=1)
        tracer.put_annotation("BookingReference", ret["bookingReference"])
        tracer.put_annotation("BookingStatus", "CONFIRMED")

        # Step Functions use the return to append `bookingReference` key into the overall output
        return ret["bookingReference"]
    except BookingConfirmationException as err:
        metrics.add_metric(name="FailedBooking", unit=MetricUnit.Count, value=1)
        tracer.put_annotation("BookingStatus", "ERROR")
        logger.exception({"operation": "booking_confirmation"})
        raise