Amazon QLDB JavaScript Driver

This is the JavaScript driver for Amazon Quantum Ledger Database (QLDB), which allows JavaScript and TypeScript developers to access AmazonQLDB in their Node.js, web, and mobile web applications.

Requirements

Basic Configuration

See Getting started in a browser script and Getting started in Node.js for more information connecting to AWS.

Usage with TypeScript 3.8.x

Development of the driver requires TypeScript 3.8.x. It will be automatically installed as a dependency. It is also recommended to use TypeScript when using the driver. Please see the link below for more detail on TypeScript 3.8.x:

• TypeScript 3.8.x

Getting Started

To use the driver, in your package that wishes to use the driver, run the following:

npm install amazon-qldb-driver-js

The driver also has aws-sdk, ion-js and jsbi as peer dependencies. Thus, they must also be dependencies of the package that will be using the driver as a dependency.

npm install aws-sdk

npm install ion-js

npm install jsbi

Then from within your package, you can now use the driver by importing it. This example shows usage in TypeScript specifying the QLDB ledger name and a specific region:

const { CognitoIdentityClient } = require("@aws-sdk/client-cognito-identity");
import { QldbDriver } from "amazon-qldb-driver-js";

const testServiceConfigOptions = {
    region: "us-east-1",
    credentials: fromCognitoIdentityPool({
        client: new CognitoIdentityClient({ region: "us-east-1" }),
        identityPoolId: "IDENTITY_POOL_ID" // IDENTITY_POOL_ID
  }),
};

const qldbDriver: QldbDriver = new QldbDriver("testLedger", testServiceConfigOptions);
qldbDriver.getTableNames().then(function(tableNames: string[]) {
    console.log(tableNames);
});

See Also

1. QLDB JavaScript driver accepts and returns Amazon ION Documents. Amazon Ion is a richly-typed, self-describing, hierarchical data serialization format offering interchangeable binary and text representations. For more information read the ION docs.
2. Amazon ION Cookbook: This cookbook provides code samples for some simple Amazon Ion use cases.
3. Amazon QLDB supports the PartiQL query language. PartiQL provides SQL-compatible query access across multiple data stores containing structured data, semistructured data, and nested data. For more information read the PartiQL docs.
4. Refer the section Common Errors while using the Amazon QLDB Drivers which describes runtime errors that can be thrown by the Amazon QLDB Driver when calling the qldb-session APIs.

Development

Setup

To install the dependencies for the driver, run the following in the root directory of the project:

npm install

To build the driver, transpiling the TypeScript source code to JavaScript, run the following in the root directory:

npm run build

Running Tests

You can run the unit tests with this command:

npm test

or

npm run testWithCoverage

Integration Tests

You can run the integration tests with this command:

npm run integrationTest

This command requires that credentials are pre-configured and it has the required permissions.

Additionally, a region can be specified in: src/integrationtest/.mocharc.json.

Documentation

TypeDoc is used for documentation. You can generate HTML locally with the following:

npm run doc

License

This project is licensed under the Apache-2.0 License.