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fwsp-cacher

v1.0.2

Published

A caching module for use with Node and Redis

Downloads

72

Readme

Cacher

A simple module for caching using Redis.

Introduction

Cacher is a wrapper module to abstract cache details and handling in order to make it easier for clients to simply get and set cached data.

Cacher has five public functions: init, setCachePrefix, getData, setData and setTTL. The most common methods you'll use after init will be the getData and setData methods.

####init

Used to initialize a cacher object with an object containing the address, port and database number for use with Redis.

let cacher = new Cacher();
cacher.init({
  url: '127.0.0.1',
  port: 6379,
  db: 1  
});

setCachePrefix

By default Cacher prefix keys in Redis with the word cacher. To specify an alternative prefix use the setCachePrefix member.

cacher.setCachePrefix('myAppName');

getData

/**
 * @name getData
 * @summary Retrieve data from cache using key.
 * @param {string} key - lookup key
 * @return {object} promise - promise resolving to value of key or rejection
 */
 getData(key)

setData

/**
 * @name setData
 * @summary Place data in cache based on key for a duration of cacheDurationInSeconds.
 * @param {string} key - lookup key
 * @param {object} data - data to store at key
 * @param {number} cacheDurationInSeconds - cache expiration
 * @return {object} promise - resolving to success or rejection
 */
 setData(key, data, cacheDurationInSeconds)

setTTL

/**
 * @name setTTL
 * @summary Set Time To Live for cache entry associated with key.
 * @param {string} key - key to set
 * @param {number} cacheDurationInSeconds - seconds to reset expiration to
 * @return {object} promise - resolving to success or rejection
 */
 setTTL(key, cacheDurationInSeconds)

Tests

This module contains tests in the specs folder.

To run them make sure you have mocha installed:

$ npm install mocha -g

Then run:

$ npm run test