Poller - the best thing since sliced bread

This is a simple little library that implements a fetch-and-poll procedure.

Getting Started

npm install @digitalscientists/poller

Usage

const fetchAndPoll = require("@digitalscientists/poller") 

const options = {
  url: "https://a-url-that-supports-polling.com/begin",
  pollUrl: (id) => `https://a-url-that-supports-polling.com/check/${id}`, // or whatever format
  wait: 2000, // how long to wait between polling (optional, defaults to 2 seconds)
  timeout: 120000, // how long to wait between polling (optional, defaults to 120 seconds)
  payload: {
    the: "payload",
    for: "the initial POST"
  }
}

const response = await fetchAndPoll(options)

Deployment

Make sure you run the tests before deploying

npm build

npm version patch # or major|minor depending on changes

npm publish

Development

npm i

npm run debug:test

Make sure you have NiM installed in chrome for best results.

You can also run npm link if ya know what you're doing. This will let you install the local dev version in a separate app. Google that for more info.

Tests

npm test

This will run the rollup build process and test the main index.js file as well as the built lib files agaist a mock server. TODO: still need to test the UMD version, but need a browser env or something for that.

current assumptions and limitations

The library currently assumes the following:

• the initial fetch will be a POST call
• the initial fetch will return something that looks like {id: "somekindaideitherastringorinteger", status:"queued"}
• subsequent polling will be GETs
• statuses for polling are: queued, done, and errored
• erroring jobs will not be retried
• everything is json. if you want xml, you're fired