Note The AMRC Connectivity Stack is an open-source implementation of the AMRC's Factory+ Framework.

This is a NodeJS library for writing clients for Factory+. It was used extensively when building the AMRC Connectivity Stack. This library is now being cut down into a compatibility shim for existing code; new code trying to consume Factory+ services should use @amrc-factoryplus/service-client instead.

Compatibility

Version 2.0.0 of this package has broken backwards compatibility as follows:

• The method basic_sparkplug_node on the MQTT interface now returns a Promise and must be awaited.
• The Debug class no longer reads VERBOSE from the environment, the option must be supplied explicitly.
• The WebAPI class now requires a verbose option to enable logging.

Further versions in the 2.x series are intended only to support the existing ACS codebase and may break backwards compat further as needed to migrate the code out into other packages. If you need functionality from this package which is not provided by @amrc-factoryplus/service-client, please speak to us first.

Getting Started

This library has native code dependencies: it requires GSSAPI libraries and (for ACS use) a Postgres library built with GSSAPI support. The most straightforward way to meet these is to build a Docker image using the base images from the ACS repository. See that repository for example Dockerfiles.

Using the package

This module is an ESM-only module; it cannot be loaded with require. If you are writing ESM code (if you have "type": "module" in yourpackage.json, or if you are using .mjs file extensions) then you can load the module like this:

import * as factoryplus from "@amrc-factoryplus/utilities";

// or

import { WebAPI } from "@amrc-factoryplus/utilities";

If you are using CommonJS (using require to load modules) you will need to use:

const factoryplus = await import("@amrc-factoryplus/utilities");

Be aware that because you can't do top-level await in CommonJS you will need to call this from within an async function.

If you are using Typescript then the ESM import should work fine. There are currently no .d.ts files; feel free to submit a PR 😀!

Exports

Third-party libraries

import { MQTT, GSS, Pg, SpB } from "@amrc-factoryplus/utilities";

These are re-exports of third party modules. They are re-exported here partly to provide protection from future changes to the third-party modules, and partly to work around bugs or problems with importing.

• Full Third-Party Library Documentation

Database access

import { DB } from "@amrc-factoryplus/utilities";

A class for accessing a Postgres database. Provides basic transaction/retry support on top of the pg module.

• Full Database Documentation

Logging

import { Debug } from "@amrc-factoryplus/utilities";

Configurable logging support.

• Full Debug/Logging Documentation

Factory+ Service Client

import { ServiceClient } from "@amrc-factoryplus/utilities";

This provides client access to the Factory+ service framework, including automatic support for service discovery and GSSAPI authentication.

• Full Service Client Documentation

Sparkplug support

import { 
    Address, Topic,
    MetricBuilder,
    MetricBranch, MetricTree,
} from "@amrc-factoryplus/utilities";

Utility classes for working with Sparkplug packets.

• Full Sparkplug Utility Class Documentation

Miscellaneous utilities

import {
    Version,
    resolve, pkgVersion,
    loadJsonObj, loadAllJson,
} from "@amrc-factoryplus/utilities";

• Full Miscellaneous Utility Documentation

Well-known UUIDs

import { UUIDs } from "@amrc-factoryplus/utilities";

Constants representing well-known UUIDs. For more information on the well-known UUIDs specified by Factory+ refer to the Factory+ framework.

Web API boilerplate

import { FplusHttpAuth, WebAPI } from "@amrc-factoryplus/utilities";

Classes useful in implementing an HTTP service confirming to the Factory+ spec.

• Full Web API Documentation

Removed APIs

As of version 2.0.0 these exports have been removed:

• debug has been replaced by the Debug object.
• secrets provided support for reading from Docker secrets; since moving to Kubernetes this has been redundant.
• gss_mqtt connected to an MQTT server with GSSAPI authentication. It is better to use a ServiceClient instead, as this will discover the MQTT server via the Directory. If it is really necessary the MQTT URL can be overridden in the ServiceClient configuration.
• fetch has been removed as an export.

Coding Style

Language	Standard
Javascript	AirBnB

Contributing

Development practice follows GitHub flow.