AMN Store

Amn Store or Request store is a tiny module build on top of express to allow you to centralize and manage your data under Request object and pass it through the middleware chain.

Please note Amn Store is tightly-coupled with express

Initialization

Before use, you have to init the storage in your middleware chain.

const express = require('express');
const store = require('amn-store');

const app = express();

app.use(store.init);

Please note store.init must be put into middleware chain before your routers.

Usage

To store and retrieve data Amn Store provides array-like functions, e.g. push, pull, pop.

Example:

const store = require('amn-store');

const middlewareOne = (req, res, next) => {

    const someObject { one: 'one', two: 'two' };

    store.push(req, { name: 'SOME_OBJECT', data: someObject});
    next();
}

const middlewareTwo = (req, res, next) => {

    const someObject = store.pull(req, { name: 'SOME_OBJECT' })

    res.send(someObject);
    next();
}

Store a JSON object

To place an object into the store, you can utilize push function. The function has the following signature.

store.pull(req, { name: string, data: object})

• req, express Request object
• name, a string that identifies your data within the store.
• data, JSON object to place in the store

const store = require('amn-store');

const myConnectMiddleware = (req, res, next) => {
    const myObject = { one: 'one', two: 'two' };
    // store data to Request with help of Amn Store
    store.push(req, { name: 'MY_OBJECT_NAME', data: myObject });
};

Retrieve from store

There are two options on how to extract data from the store. Utilizing pull or pop functions.

const store = require('amn-store');

const myConnectMiddleware = (req, res, next) => {
    // by default pull function will look into store to find and object with key 'MY_OBJECT_NAME'. In case object is not found, it throws and error.
    const myObject = store.pull(req, { name: 'MY_OBJECT_NAME' });
    // you can disable internal check by passing strick = false
    const myObject = store.pull(req, { name: 'MY_OBJECT_NAME', strict: false });
    // in case not suck object in store pull function return `undefined`. It is your responsibility to check whether an object exists.
    if (!myObject) {
        throw new Error('Object not found in store.');
    }
};

pull vs pop

pull and pop function are identical signature wise. pop function remove object from the store once you extract it.