Introduction

The classy-pay-core NPM module contains a set of reusable common tools used in ClassyPay-related projects. There are a few pieces of functionality included, most notably:

• A plugin-based, lazily loaded configuration "dictionary" (implemented by the Config class). The intent here is to be able to provide a bunch of different running node applications with a common set of lazily-populated global state, e.g. configuration that's shared between applications. A sample implementation (aws/AWSConfig) and set of plugins (inside DataSources/) is included as well (though probably minimally useful to anyone outside of Classy).

• A client that can be used to authenticate with / converse with the ClassyPay APIs (PayClient).

• A set of general purpose utilities:

  • Lock: a simple mutex
  • Once: a JavaScript implementation of pthread_once
  • callbackWrapper: code which allows you to perform promise-based operations (or async/await-based) from within a callback
  • Some other random utilities

Usage

To load parts of the module, first load classy-pay-core as a whole, and then call submodule on the default export, like so:

const Once = require('classy-pay-core').submodule('utils/Once');