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cache-redis-fg

v1.1.2

Published

A simple interface cacher based on ioredis.

Downloads

4

Readme

cache-redis-fg

A simple interface cacher based on ioredis.

Getting Start

NPM

Installation

npm i -S cache-redis-fg

Usage

Table of Contents

Parameters

1. 参数opt, redis配置

  • @param {object} opt 数据库配置
  • @param {number} opt.prefix 设置缓存的前缀
  • @param {number} opt.expire 设置的失效时间, 单位s
  • @param {object} opt.reids redis配置
  • @param {String} opt.reids.host redis host配置
  • @param {String} opt.reids.port redis port配置
  • @param {String} opt.reids.db redis 存储db配置

new Cache(opt);

2. 参数payload, 缓存参数

  • @param {object} payload
  • @param {string} payload.key 要查找的key
  • @param {function} payload.executor 如果未击中,要执行的

返回

  • @return {Promise.} 缓存中数据(击中) 或executor返回数据(未击中)

Usage

get

example that result of Promise instance

const getShopes = (type) => {
  let result;
  switch (type) {
    case 1:
      result = Promise.reject(new Error('bad params'));
      break;
    case 2:
      result = Promise.resolve(undefined);
      break;
    case 3:
      result = Promise.resolve(
        {
          obj1: ['shop01', 'shop02', 1, 2],
          obj2: 2,
        },
      );
      break;
    default:
      result = Promise.resolve('sucessful');
  }
  return result;
};

support deafeat cache in redis 12

const cache = new Cacher();
  const payload = {
    key: 'getShopes',
    executor: getShopes.bind(null, 0),
  };
await cache.get(payload);

support redis config

const opt1 = {
    redis: {
      db: '12',
    },
    prefix: 'testCache_',
    expire: 100,
  };
const cache = new Cacher(opt1);
  const payload = {
    key: 'getShopes',
    executor: getShopes.bind(null, 0),
  };
await cache.get(payload);

suppose complex object

  const cache = new Cacher();
  const payload = {
    key: 'getShopes',
    executor: getShopes.bind(null, 3),
  };
  await cache.get(payload);

delete

suppose remove the key in redis

  const cache = new Cache();
  cache.delete(key);

attention

  1. if you Promise instance return result is undefined, the result would not to cache.
  2. if you expire time config < 0, would config expire time is 5s.