Langkah 2: Uji konektivitas ke buku besar - Amazon Quantum Ledger Database (Amazon QLDB)

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Langkah 2: Uji konektivitas ke buku besar

Pada langkah ini, Anda memverifikasi bahwa Anda dapat terhubung ke vehicle-registration buku besar di Amazon QLDB menggunakan titik akhir API data transaksional.

Untuk menguji konektivitas ke buku besar
  1. Gunakan program berikut (ConnectToLedger.ts) untuk membuat koneksi sesi data ke vehicle-registration buku besar.

    2.x
    /* * 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 { QldbDriver, RetryConfig } from "amazon-qldb-driver-nodejs"; import { ClientConfiguration } from "aws-sdk/clients/qldbsession"; import { LEDGER_NAME } from "./qldb/Constants"; import { error, log } from "./qldb/LogUtil"; const qldbDriver: QldbDriver = createQldbDriver(); /** * Create a driver for creating sessions. * @param ledgerName The name of the ledger to create the driver on. * @param serviceConfigurationOptions The configurations for the AWS SDK client that the driver uses. * @returns The driver for creating sessions. */ export function createQldbDriver( ledgerName: string = LEDGER_NAME, serviceConfigurationOptions: ClientConfiguration = {} ): QldbDriver { const retryLimit = 4; const maxConcurrentTransactions = 10; //Use driver's default backoff function (and hence, no second parameter provided to RetryConfig) const retryConfig: RetryConfig = new RetryConfig(retryLimit); const qldbDriver: QldbDriver = new QldbDriver(ledgerName, serviceConfigurationOptions, maxConcurrentTransactions, retryConfig); return qldbDriver; } export function getQldbDriver(): QldbDriver { return qldbDriver; } /** * Connect to a session for a given ledger using default settings. * @returns Promise which fulfills with void. */ const main = async function(): Promise<void> { try { log("Listing table names..."); const tableNames: string[] = await qldbDriver.getTableNames(); tableNames.forEach((tableName: string): void => { log(tableName); }); } catch (e) { error(`Unable to create session: ${e}`); } } if (require.main === module) { main(); }
    1.x
    /* * 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 { QldbDriver } from "amazon-qldb-driver-nodejs"; import { ClientConfiguration } from "aws-sdk/clients/qldbsession"; import { LEDGER_NAME } from "./qldb/Constants"; import { error, log } from "./qldb/LogUtil"; const qldbDriver: QldbDriver = createQldbDriver(); /** * Create a driver for creating sessions. * @param ledgerName The name of the ledger to create the driver on. * @param serviceConfigurationOptions The configurations for the AWS SDK client that the driver uses. * @returns The driver for creating sessions. */ export function createQldbDriver( ledgerName: string = LEDGER_NAME, serviceConfigurationOptions: ClientConfiguration = {} ): QldbDriver { const qldbDriver: QldbDriver = new QldbDriver(ledgerName, serviceConfigurationOptions); return qldbDriver; } export function getQldbDriver(): QldbDriver { return qldbDriver; } /** * Connect to a session for a given ledger using default settings. * @returns Promise which fulfills with void. */ var main = async function(): Promise<void> { try { log("Listing table names..."); const tableNames: string[] = await qldbDriver.getTableNames(); tableNames.forEach((tableName: string): void => { log(tableName); }); } catch (e) { error(`Unable to create session: ${e}`); } } if (require.main === module) { main(); }
    catatan

    Untuk menjalankan transaksi data pada buku besar Anda, Anda harus membuat objek driver QLDB untuk terhubung ke buku besar tertentu. Ini adalah objek klien yang berbeda dari qldbClient objek yang Anda gunakan pada langkah sebelumnya untuk membuat buku besar. Klien sebelumnya hanya digunakan untuk menjalankan operasi API manajemen yang tercantum dalamReferensi API Amazon QLDB.

  2. Untuk menjalankan program transpiled, masukkan perintah berikut.

    node dist/ConnectToLedger.js

Untuk membuat tabel di vehicle-registration buku besar, lanjutkan keLangkah 3: Buat tabel, indeks, dan data sampel.