PatternFly Topology

This package provides the resources necessary to use PatternFly Topology, an open source utility that you can use to create a visual representation of all the applications within your project, their build status, and the components and services associated with them.

Topology utilizes some of PatternFly's React components https://github.com/patternfly/patternfly-react.

Documentation for Topology and its features is available on the PatternFly website.

Table of contents

• Prerequisites
• Installing Topology
• Initial setup and usage
• Example
• Demo app

Prerequisites

To use Topology, you will need to have both Node Active LTS and Yarn installed.

1. Install and develop with the most up-to-date version of Node Active LTS. For example, to develop with Node 8, you would use the following commands:

   nvm install 8
   nvm use 8
   

2. Install and use version 1.6.0 or later of Yarn.

Installing Topology

Once you have all of the prequisites, you can install the Topology package with Yarn or npm:

1. Using Yarn:

   yarn add @patternfly/react-topology
   

2. Using npm:

   npm install @patternfly/react-topology --save
   

Initial setup and usage

To use Topology out of the box, follow these steps:

1. First transform your back-end data into a Model object. This will contain the information needed to display the nodes and edges in your Topology view. Each node and edge contains a set of properties used by Topology, as well as a data field, which Topology can be used to customize the nodes and edges.

2. Declare a controller, which can be initialized via the useVisualizationController() method.

3. Create nodes by calling the fromModel method on the controller you initialized. fromModel will take the Model that you created as a parameter. Your data model should include a graph object, on which you will need to set id , type, and layout.

4. To create your Topology view component, wrap TopologyView around <VisualizationSurface>, which can accept a state parameter.

   • The value of state is application specific and should include any data the application wants to store/retrieve from the controller.
   • Adding state to <VisualizationSurface> allows hooks to update when state changes.
   • State can also be used to keep track of your graph state, such as selected elements.

5. Wrap your TopologyView with your controller. In the example below, this is done via the VisualizationProvider which consumes the Controller via context.

6. There are 3 register methods that the controller accesses.

   These 2 must be declared explicitly:

   1. registerLayoutFactory: Sets the layout of your topology view (e.g. Force, Dagre, Cola, etc.). You can use defaultLayoutFactory as a parameter if your application supports all layouts. You can also update defaultLayout to a custom implementation if you only want to support a subset of the available layout options.
   2. registerComponentFactory: Lets you customize the components in your topology view (e.g. nodes, groups, and edges). You can use defaultComponentFactory as a parameter.

   The remaining method is initialized in Visualization.ts, so it doesn't need to be declared unless you want to support a custom implementation that modifies the types:

   3. registerElementFactory: Sets the types of the elements being used (e.g. graphs, nodes, edges). defaultElementFactory uses types from ModelKind and is exported in index.ts.

Example

import * as React from 'react';
import {
  EdgeStyle,
  Model,
  NodeShape,
  SELECTION_EVENT,
  Visualization,
  VisualizationProvider,
  VisualizationSurface
} from '@patternfly/react-topology';
import defaultLayoutFactory from './layouts/defaultLayoutFactory';
import defaultComponentFactory from './components/defaultComponentFactory';

const NODE_SHAPE = NodeShape.ellipse;
const NODE_DIAMETER = 75;

const NODES = [
  {
    id: 'node-0',
    type: 'node',
    label: 'Node 0',
    width: NODE_DIAMETER,
    height: NODE_DIAMETER,
    shape: NODE_SHAPE
  },
  {
    id: 'node-1',
    type: 'node',
    label: 'Node 1',
    width: NODE_DIAMETER,
    height: NODE_DIAMETER,
    shape: NODE_SHAPE
  },
  {
    id: 'node-2',
    type: 'node',
    label: 'Node 2',
    width: NODE_DIAMETER,
    height: NODE_DIAMETER,
    shape: NODE_SHAPE
  },
  {
    id: 'node-3',
    type: 'node',
    label: 'Node 3',
    width: NODE_DIAMETER,
    height: NODE_DIAMETER,
    shape: NODE_SHAPE
  },
  {
    id: 'node-4',
    type: 'node',
    label: 'Node 4',
    width: NODE_DIAMETER,
    height: NODE_DIAMETER,
    shape: NODE_SHAPE
  },
  {
    id: 'node-5',
    type: 'node',
    label: 'Node 5',
    width: NODE_DIAMETER,
    height: NODE_DIAMETER,
    shape: NODE_SHAPE
  },
  {
    id: 'Group-1',
    children: ['node-0', 'node-1', 'node-2', 'node-3'],
    type: 'group-hull',
    group: true,
    label: 'Group-1',
    style: {
      padding: 15
    }
  }
];

const EDGES = [
  {
    id: 'edge-node-4-node-5',
    type: 'edge',
    source: 'node-4',
    target: 'node-5',
    edgeStyle: EdgeStyle.default
  },
  {
    id: 'edge-node-0-node-2',
    type: 'edge',
    source: 'node-0',
    target: 'node-2',
    edgeStyle: EdgeStyle.default
  }
];

export const TopologyBaselineDemo = React.memo(() => {
  const [selectedIds, setSelectedIds] = React.useState<string[]>([]);

  const controller = React.useMemo(() => {
    const model: Model = {
      nodes: NODES,
      edges: EDGES,
      graph: {
        id: 'g1',
        type: 'graph',
        layout: 'Cola'
      }
    };

    const newController = new Visualization();
    newController.registerLayoutFactory(defaultLayoutFactory);
    newController.registerComponentFactory(defaultComponentFactory);

    newController.addEventListener(SELECTION_EVENT, setSelectedIds);

    newController.fromModel(model, false);

    return newController;
  }, []);

  return (
    <VisualizationProvider controller={controller}>
      <VisualizationSurface state={{ selectedIds }} />
    </VisualizationProvider>
  );
});

Demo app

To help you better understand and visualize the different Topology components, we have created an interactive demo, which is contained here.

Continue reading for instructions on how to build and run the demo app.

Prerequisites

In order to run the demo app, you need to make sure the following prerequisites are met.

1. Make sure that you have yarn installed, as outlined in the general Topology prerequisites.
2. If you haven’t already, fork the Topology project.

Running the demo app

Once you’ve set up the prerequisites, you can follow these steps to run the docs workspace or the demo app on your local machine

1. In a terminal, type the following commands to start the docs workspace:

yarn install
yarn start

2. In a terminal, type the following commands to navigate to demo-app-ts and launch the demo app:

cd packages/demo-app-ts
yarn start:demo-app:hot

3. You will receive a message confirming that the app is running. To view the locally running workspace, visit http://localhost:8008/.

4. Explore the demo app in your browser:

Need help?

If you find a bug, have a request, or have any questions about Topology that aren't answered in our documentation, please reach out to us on Slack.