Paso 1: Creación de un libro de contabilidad nuevo - Amazon Quantum Ledger Database (Amazon QLDB)

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Paso 1: Creación de un libro de contabilidad nuevo

En este paso, creará un nuevo libro mayor de Amazon QLDB denominadovehicle-registration.

Para crear un libro de contabilidad nuevo

  1. Revise el siguiente archivo (constants.py), que contiene valores constantes que utilizan todos los demás programas de este tutorial.

    # Copyright 2019 Amazon.com, Inc. or its affiliates. All Rights Reserved. # SPDX-License-Identifier: MIT-0 # # Permission is hereby granted, free of charge, to any person obtaining a copy of this # software and associated documentation files (the "Software"), to deal in the Software # without restriction, including without limitation the rights to use, copy, modify, # merge, publish, distribute, sublicense, and/or sell copies of the Software, and to # permit persons to whom the Software is furnished to do so. # # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, # INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A # PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT # HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION # OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE # SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. class Constants: """ Constant values used throughout this tutorial. """ LEDGER_NAME = "vehicle-registration" VEHICLE_REGISTRATION_TABLE_NAME = "VehicleRegistration" VEHICLE_TABLE_NAME = "Vehicle" PERSON_TABLE_NAME = "Person" DRIVERS_LICENSE_TABLE_NAME = "DriversLicense" LICENSE_NUMBER_INDEX_NAME = "LicenseNumber" GOV_ID_INDEX_NAME = "GovId" VEHICLE_VIN_INDEX_NAME = "VIN" LICENSE_PLATE_NUMBER_INDEX_NAME = "LicensePlateNumber" PERSON_ID_INDEX_NAME = "PersonId" JOURNAL_EXPORT_S3_BUCKET_NAME_PREFIX = "qldb-tutorial-journal-export" USER_TABLES = "information_schema.user_tables" S3_BUCKET_ARN_TEMPLATE = "arn:aws:s3:::" LEDGER_NAME_WITH_TAGS = "tags" RETRY_LIMIT = 4
  2. Utilice el siguiente programa (create_ledger.py) para crear un libro de contabilidad denominadovehicle-registration.

    # Copyright 2019 Amazon.com, Inc. or its affiliates. All Rights Reserved. # SPDX-License-Identifier: MIT-0 # # Permission is hereby granted, free of charge, to any person obtaining a copy of this # software and associated documentation files (the "Software"), to deal in the Software # without restriction, including without limitation the rights to use, copy, modify, # merge, publish, distribute, sublicense, and/or sell copies of the Software, and to # permit persons to whom the Software is furnished to do so. # # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, # INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A # PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT # HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION # OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE # SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. # # This code expects that you have AWS credentials setup per: # https://boto3.amazonaws.com/v1/documentation/api/latest/guide/quickstart.html from logging import basicConfig, getLogger, INFO from time import sleep from boto3 import client from pyqldbsamples.constants import Constants logger = getLogger(__name__) basicConfig(level=INFO) qldb_client = client('qldb') LEDGER_CREATION_POLL_PERIOD_SEC = 10 ACTIVE_STATE = "ACTIVE" def create_ledger(name): """ Create a new ledger with the specified name. :type name: str :param name: Name for the ledger to be created. :rtype: dict :return: Result from the request. """ logger.info("Let's create the ledger named: {}...".format(name)) result = qldb_client.create_ledger(Name=name, PermissionsMode='ALLOW_ALL') logger.info('Success. Ledger state: {}.'.format(result.get('State'))) return result def wait_for_active(name): """ Wait for the newly created ledger to become active. :type name: str :param name: The ledger to check on. :rtype: dict :return: Result from the request. """ logger.info('Waiting for ledger to become active...') while True: result = qldb_client.describe_ledger(Name=name) if result.get('State') == ACTIVE_STATE: logger.info('Success. Ledger is active and ready to use.') return result logger.info('The ledger is still creating. Please wait...') sleep(LEDGER_CREATION_POLL_PERIOD_SEC) def main(ledger_name=Constants.LEDGER_NAME): """ Create a ledger and wait for it to be active. """ try: create_ledger(ledger_name) wait_for_active(ledger_name) except Exception as e: logger.exception('Unable to create the ledger!') raise e if __name__ == '__main__': main()
    nota
    • En el navegadorcreate_ledgerllamada a, debe especificar un nombre de libro mayor y un modo de permisos. Le recomendamos que utilice laSTANDARDmodo de permisos para maximizar la seguridad de los datos de su libro mayor.

    • Al crear un libro de contabilidad,Protección contra eliminaciónestá habilitado de manera predeterminada. Esta es una función de QLDB que impide que un usuario elimine libros mayores. Tiene la opción de deshabilitar la protección contra eliminación en la creación del libro mayor mediante la API de QLDB o elAWS Command Line Interface(AWS CLI).

    • Si lo desea, también puede especificar etiquetas para adjuntar a su libro mayor.

  3. Para ejecutar el programa, introduzca el siguiente comando.

    python create_ledger.py

Para verificar la conexión con el nuevo libro mayor, proceda aPaso 2: Comprobar la conectividad con el libro mayor.