NPM Package for PowerKraut Data Utils.

Utility library to be used by PowerKraut data projects.

Installation

npm install @powerkraut/data-utils-js --save

Available Modules

• GoogleCloud\Logging\Logger This allows logging to stackdriver logging API, with support for labels and severity levels.
• GoogleCloud\Functions\sendMessage A helper binary to allow sending test to your local cloud-functions framework.

The documentation of the individual modules can be found in the class document blocks.

Config installation / loader

This packages contains several classes to support with config installation / loading. To allow the installation of a config, create a js script to handle the installation, for example: cli/installConfig.js. The default install script in this package can be used to create a basic config installation.

import {InstallConfig} from "@powerkraut/data-utils-js";

const installer = new InstallConfig({
    configDefaultPath: `path/to/config/output`,
});

// Execute the script
installer.handle();

The install script can be extended to adopt custom installation logic if necessary. The ConfigLoader class can then be used to read the configuration and load them into environment variables. To create an instance of this class use the following code:

import {ConfigLoader} from "@powerkraut/data-utils-js";

const loader = new ConfigLoader({
    configDefaultFile: '[config-file-name].js',
    configDefaultPath: 'path/to/config/[config-file-name].js'
});

This class is also used by the AbstractCli class, used to create CLI commands.

CLI commands

Creating CLI commands you should extend the AbstractCli class from this packages. For now this class only allows access to the config loader. Be sure to call the super constructor with the correct config info.

import {AbstractCli} from "@powerkraut/data-utils.js";

class SayHello extends AbstractCli {
    constructor() {
        super({
            configDefaultFile: '[config-file-name].js',
            configDefaultPath: 'path/to/config/[config-file-name].js'
        });
    }
    
    handle() {
        console.log('Hello from: ' + super.configLoader.getCwdDir());
    }
}

GCloud / Deployment

This package exposes several classes to help with deployments. To start with, the GCloudCli class allows for the execution of commands to google cloud. The class contains several pre-coded commands and has a method to execute any command. The gcloud prefix should be omitted.

import {GCloudCli} from "@powerkraut/data-utils.js";

const cli = new GCloudCli();

cli.getCurrentProject();
cli.setProject('[project]');
cli.getIdentityToken();

// Or execute any other command:
cli.exec(['config', 'get', 'project']);

The GCloudCli is used by this package to handle deployments. The GoogleDeploymentManager class extends the GCloudCli class and adds CRUD methods to manage deployments. Combining the CLI and deployment classes, the DeployCloudFunction class adds helper methods to assist with the creation of a deployment script.

Like the installation of the config file, a js file should be created to allow cli execution, for example: cli/deployCloudFunction.js. A most basic implementation could look like this:

DeploymentScript.js

import {DeployCloudFunction} from "@powerkraut/data-utils-js";

export default class DeploymentScript extends DeployCloudFunction {
    constructor() {
        super(
            {
                npmRcDistPath:      './../../../.npmrc.dist',
                cloudFunctionsPath: `path/to/cloud-function`
            },
            {
                configDefaultFile: '[config-file-name].js',
                configDefaultPath: 'path/to/config/[config-file-name].js'
            }
        );
    }

    /**
     * @return {Promise<void>}
     */
    async handle() {
        await super.configLoader.loadActiveConfigIntoProcessEnv();
        await this.deployCloudFunction();
    }

    /**
     * @return {Promise<void>}
     */
    async deployCloudFunction() {
        await super.createDeploymentFolder();
        await super.writeEnvFile();
        await super.writeGoogleApplicationCredentialsFile();

        const functionArgs = [];
        const workingDir   = process.cwd();

        functionArgs.push('--runtime=nodejs16');
        functionArgs.push(`--trigger-topic=${process.env["PUBSUB_TOPIC"]}`);
        functionArgs.push(`--entry-point=${process.env["FUNCTION_NAME"]}`);
        functionArgs.push('--region=europe-west1');
        functionArgs.push('--env-vars-file=env.yaml');
        functionArgs.push('--source=.');

        process.chdir(super.getTempDeployDirectory());

        console.log(chalk.yellow('Deploying with the following args'));
        console.log(chalk.yellow(functionArgs.toString()));
        (new GCloudCli()).exec(['beta', 'functions', 'deploy', `${process.env["FUNCTION_NAME_REST"]}`, ...functionArgs]);

        process.chdir(workingDir);
    }
}

deployCloudFunctions.js

import DeploymentScript from './DeploymentScript.js';

(new DeploymentScript()).handle();

Background events

To help with background events spawned by Google Cloud you can use the PubSubBackgroundEventController class. By extending this class you can easily access the data from the event, and flag the event as failed or aborted. See the src/Functions/PubSubBackgroundEventController.js file for all the functionality.