Paso 1: crear un nuevo libro mayor - Amazon Quantum Ledger Database (Amazon QLDB)

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Paso 1: crear un nuevo libro mayor

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

Para crear un nuevo libro mayor
  1. Revise el siguiente archivo (Constants.ts), 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. */ /** * Constant values used throughout this tutorial. */ export const LEDGER_NAME = "vehicle-registration"; export const LEDGER_NAME_WITH_TAGS = "tags"; export const DRIVERS_LICENSE_TABLE_NAME = "DriversLicense"; export const PERSON_TABLE_NAME = "Person"; export const VEHICLE_REGISTRATION_TABLE_NAME = "VehicleRegistration"; export const VEHICLE_TABLE_NAME = "Vehicle"; export const GOV_ID_INDEX_NAME = "GovId"; export const LICENSE_NUMBER_INDEX_NAME = "LicenseNumber"; export const LICENSE_PLATE_NUMBER_INDEX_NAME = "LicensePlateNumber"; export const PERSON_ID_INDEX_NAME = "PersonId"; export const VIN_INDEX_NAME = "VIN"; export const RETRY_LIMIT = 4; export const JOURNAL_EXPORT_S3_BUCKET_NAME_PREFIX = "qldb-tutorial-journal-export"; export const USER_TABLES = "information_schema.user_tables";
  2. Utilice el siguiente programa (CreateLedger.ts) para crear un libro mayor denominado vehicle-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. */ import { QLDB } from "aws-sdk"; import { CreateLedgerRequest, CreateLedgerResponse, DescribeLedgerRequest, DescribeLedgerResponse } from "aws-sdk/clients/qldb"; import { LEDGER_NAME } from "./qldb/Constants"; import { error, log } from "./qldb/LogUtil"; import { sleep } from "./qldb/Util"; const LEDGER_CREATION_POLL_PERIOD_MS = 10000; const ACTIVE_STATE = "ACTIVE"; /** * Create a new ledger with the specified name. * @param ledgerName Name of the ledger to be created. * @param qldbClient The QLDB control plane client to use. * @returns Promise which fulfills with a CreateLedgerResponse. */ export async function createLedger(ledgerName: string, qldbClient: QLDB): Promise<CreateLedgerResponse> { log(`Creating a ledger named: ${ledgerName}...`); const request: CreateLedgerRequest = { Name: ledgerName, PermissionsMode: "ALLOW_ALL" } const result: CreateLedgerResponse = await qldbClient.createLedger(request).promise(); log(`Success. Ledger state: ${result.State}.`); return result; } /** * Wait for the newly created ledger to become active. * @param ledgerName Name of the ledger to be checked on. * @param qldbClient The QLDB control plane client to use. * @returns Promise which fulfills with a DescribeLedgerResponse. */ export async function waitForActive(ledgerName: string, qldbClient: QLDB): Promise<DescribeLedgerResponse> { log(`Waiting for ledger ${ledgerName} to become active...`); const request: DescribeLedgerRequest = { Name: ledgerName } while (true) { const result: DescribeLedgerResponse = await qldbClient.describeLedger(request).promise(); if (result.State === ACTIVE_STATE) { log("Success. Ledger is active and ready to be used."); return result; } log("The ledger is still creating. Please wait..."); await sleep(LEDGER_CREATION_POLL_PERIOD_MS); } } /** * Create a ledger and wait for it to be active. * @returns Promise which fulfills with void. */ const main = async function(): Promise<void> { try { const qldbClient: QLDB = new QLDB(); await createLedger(LEDGER_NAME, qldbClient); await waitForActive(LEDGER_NAME, qldbClient); } catch (e) { error(`Unable to create the ledger: ${e}`); } } if (require.main === module) { main(); }
    nota
    • En la llamada createLedger, debe especificar un nombre de libro mayor y un modo de permisos. Recomendamos encarecidamente el modo de permisos STANDARD para maximizar la seguridad de los datos del libro mayor.

    • Al crear un libro mayor, se habilita de forma predeterminada la protección contra la eliminación. Se trata de una característica de QLDB que impide que los libros mayores sean eliminados por cualquier usuario. Tiene la opción de deshabilitar la protección contra la eliminación al crear el libro mayor con la API QLDB o AWS Command Line Interface (AWS CLI).

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

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

    node dist/CreateLedger.js

Para comprobar la conexión con el nuevo libro mayor, continúe con Paso 2: probar la conectividad con el libro mayor.