Ultravisor Beacon

A lightweight beacon client and Fable service for remote task execution. Ultravisor Beacon turns any Node.js application into a distributed worker node that connects to an Ultravisor server, advertises capabilities, and executes work items on demand.

Features

• Fable Service Integration — Register as a service in any Fable/Pict application with addAndInstantiateServiceType()
• Pluggable Providers — Built-in Shell, FileSystem, and LLM providers; extend with custom providers via class, factory, or npm package
• Automatic Transport — Tries WebSocket for push-based dispatch, falls back to HTTP polling transparently
• File Transfer — Automatic source file download and output collection with affinity-scoped caching
• Multi-Backend LLM — Unified interface across OpenAI, Anthropic, Ollama, and OpenAI-compatible APIs
• Resilient Connectivity — Auto-reconnect with re-authentication on connection loss

Documentation

Comprehensive documentation is available in the docs folder:

• Overview — Introduction and getting started
• Quick Start — Step-by-step setup guide
• Architecture — System design and mermaid diagrams
• API Reference — All classes and methods
• Providers — Built-in and custom providers

Install

$ npm install ultravisor-beacon

Quick Start

As a Fable Service

const libFable = require('fable');
const libBeacon = require('ultravisor-beacon');

let tmpFable = new libFable({ Product: 'MyApp', ProductVersion: '1.0.0' });

tmpFable.addAndInstantiateServiceType('UltravisorBeacon', libBeacon, {
	ServerURL: 'http://localhost:54321',
	Name: 'my-app-beacon'
});

let tmpBeacon = tmpFable.services.UltravisorBeacon;

tmpBeacon.registerCapability({
	Capability: 'MyApp',
	actions:
	{
		'ProcessData':
		{
			Description: 'Process a data payload',
			Handler: function (pWorkItem, pContext, fCallback)
			{
				let tmpResult = doSomeWork(pWorkItem.Settings);
				return fCallback(null, { Outputs: { Result: tmpResult }, Log: ['Done.'] });
			}
		}
	}
});

tmpBeacon.enable(function (pError, pBeacon)
{
	console.log('Beacon online:', pBeacon.BeaconID);
});

Standalone Client

const libBeaconClient = require('ultravisor-beacon').BeaconClient;

let tmpClient = new libBeaconClient({
	ServerURL: 'http://localhost:54321',
	Name: 'shell-worker',
	Capabilities: ['Shell'],
	MaxConcurrent: 4
});

tmpClient.start(function (pError, pBeacon)
{
	console.log('Worker online:', pBeacon.BeaconID);
});

Related Packages

• fable — Service dependency injection framework
• fable-serviceproviderbase — Service provider base class
• ultravisor — Process supervision and orchestration server

License

MIT

Contributing

Pull requests are welcome. For details on our code of conduct, contribution process, and testing requirements, see the Retold Contributing Guide.