cache.js
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/**
* 缓存封装
* 前期使用 memcache, 写方法的时候考虑一下如何转换为 redis
* @author bikai kai.bi@yoho.cn
* @date 2016/05/16
*/
'use strict';
const Promise = require('bluebird');
const Memcached = require('memcached');
const _ = require('lodash');
const log = require('./logger');
const config = require('../config/common');
let master = new Memcached(config.memcache.master, config.memcache);
let slave = new Memcached(config.memcache.slave, config.memcache);
master = Promise.promisifyAll(master);
slave = Promise.promisifyAll(slave);
/**
* 获取缓存
* @param {[string]} key 键
* @return {[type]}
*/
exports.get = (key) => {
if (_.isString(key)) {
return master.getAsync(key);
}
return Promise.resolve();
};
/**
* 批量获取缓存
* @param {[array]} list 字符串数组
* @return {[type]}
*/
exports.getMulti = (list) => {
if (_.isArray(list)) {
return master.getMultiAsync(list);
}
return Promise.resolve();
};
/**
* 获取缓存(从 Slave 服务器)
* @param {[string]} key 键
* @return {[type]}
*/
exports.getFromSlave = (key) => {
if (_.isString(key)) {
return slave.getAsync(key);
}
return Promise.resolve();
};
/**
* 批量获取缓存(从 Slave 服务器)
* @param {[array]} list 字符串数组
* @return {[type]}
*/
exports.getMultiFromSlave = (list) => {
if (_.isArray(list)) {
return slave.getMultiAsync(list);
}
return Promise.resolve();
};
/**
* 写缓存
* @param {[type]} key 键
* @param {[type]} value 值
* @param {[type]} lifetime 生命周期
* @return {[type]}
*/
exports.set = (key, value, lifetime) => {
lifetime = lifetime || 86400;
log.info(`write cache: ${key}`);
if (_.isObject(value)) {
value = JSON.stringify(value);
}
if (_.isString(key)) {
return master.setAsync(key, value, lifetime);
}
return Promise.resolve();
};
/**
* 写缓存(到 Slave 服务器)
* @param {[type]} key 键
* @param {[type]} value 值
* @param {[type]} lifetime 生命周期
* @return {[type]}
*/
exports.setSlave = (key, value, lifetime) => {
lifetime = lifetime || 86400;
if (_.isObject(value)) {
value = JSON.stringify(value);
}
if (_.isString(key)) {
return slave.setAsync(key, value, lifetime);
}
return Promise.resolve();
};
/**
* 删除缓存
* @param {[string]} key 键
* @return {[type]}
*/
exports.del = (key) => {
if (_.isString(key)) {
return master.delAsync(key);
}
return Promise.resolve();
};