@waylay/rules-helper v1.4.0

Waylay Rules Helper

intro

This library will allow the user to create waylay tasks in an easier way.

There's two ways to use this library:

• with a config and the so called subflows
• with a chain style builder which requires no config, and adheres to the waylay format of plugins.

More on the specific ways below.

This is not a UI library.

Installation

npm install @waylay/rules-helper

Subflow

The subflow builder uses the so called subflows as the main components. Each of these subflows has to be defined in the config which has to be passed to the builder on initialisation.

A subflow should be seen as a wrapper for waylay plugins which will be executed sequentially. These can then be used in the UI to hide complex waylay logic.

Subflow configuration

A subflow requires a name, description, properties and a list of waylay plugins You can template the input params of a waylay plugin through the properties of the subflow. Use the template notation seen below on resource, to use the input as an argument of the plugin.

a keyword that's always available is <%previousNode%>. This way you can access data from the previously configured waylay plugin.

[
  {
    name: 'exit geofence',
    description: 'Checks if a resource entered a geofence',
    properties: {
      resource: {
        type: 'string'
      }
    },
    plugins: [{
      name: 'stream',
      type: 'sensor',
      version: '1.0.0',
      properties: {
        resource: '<%properties.resource%>'
      },
      dataTrigger: true,
      tickTrigger: false,
      triggers: [
        'Data'
      ]
    },
    {
      name: 'condition',
      version: '1.1.0',
      type: 'sensor',
      properties: {
        condition: '${<%previousNode%>.rawData.stream.direction} === "EXIT"',
      },
      dataTrigger: false,
      tickTrigger: false,
      triggers: [
        'True'
      ]
    }]
  }
]

Setting up the package

To use the subflow part of the waylay task-helper, you need to setup the waylay helper with the clientId, secret and domain of your waylay instance. The config is the array of subflows as configured above.

const Helper = require('@waylay/rules-helper')

const { subflow } = new Helper({ clientID: CLIENT_ID, secret: CLIENT_SECRET, domain: DOMAIN, config: exampleConfig })

Builder

Starting the builder

To use the builder you need to create a subflow builder instance.

const builder = subflow.createTaskBuilder()

Step

A step consists of 2 parts, the name of the subflow you want to use for the step and the properties defined on that subflow.

{
    name: 'exit geofence',
    properties: {
        resource: 'test resource'
    }
}

Functions

All these functions can be chained after one another

builder
    .addStep(dummyStepStream)
    .addAndGate([dummyStep, dummyStep])
    .addStep(dummyActuator)
    .createTask('subflow builder example test', {})

Chain

The chain builder is the most straight forward one to use seeing as it doesn't need a config to work. The downside to this is that more Waylay logic will have to be applied as a user / through the UX.

Setting up the package

To use the chain part of the waylay task-helper, you need to setup the waylay helper with the clientId, secret and domain of your waylay instance. The chain part of the task-helper doesn't require a configuration.

const Helper = require('@waylay/rules-helper')

const { chain } = new Helper({ clientID: CLIENT_ID, secret: CLIENT_SECRET, domain: DOMAIN })

Builder

List all plugins

const { sensors, actuators } = await chain.getPlugins()

Returns a list of all plugins active on your waylay instance. seperated into the categories sensors and actuators.

Starting the builder

To use the builder you need to create a chain builder instance.

const builder = chain.createBuilder()

Step

The steps of the chain builder adhere to the waylay format of plugins.

{
    name: 'inRange',
    type: 'sensor',
    version: '1.0.2',
    properties: {
        value: '${task.streamData}'
    },
    states: ['Above', 'In Range'],
    dataTrigger: true,
    tickTrigger: true
}

Functions

All these functions can be chained after one another

builder
    .addStep(step)
    .addAndGate([step, step])
    .addStep(step)
    .createTask('chain builder example test', {})