jsperf-img-svc/lib/cache.js

A simple micro service for loading jsperf result charts as a static image

'use strict';

const
	_ = require('lodash'),
	redis = require('redis'),
	Promise = require('bluebird'),
	config = require('./config');

Promise.promisifyAll(redis.RedisClient.prototype);

exports.getClient = function(){
	return redis.createClient(config.redisURL);
};

exports.read = function(client, key){
	return client.hgetAsync(key, 'data');
};

exports.write = function(client, key, data, ttl){
	return client.hmsetAsync(key, {
		expires: Date.now() + (ttl || 0),
		data: data
	});
};

exports.expired = function(client, key){
	return client.hgetAsync(key, 'expires')
		.then((expires) => {
			let result;
			if (_.parseInt(expires) >= Date.now()) {
				result = client.hgetAsync(key, 'data');
			} else {
				if (expires) {
					logger.verbose(`${key} expired`);
					client.delAsync(key);
				}
				result = Promise.reject(_.assign(new Error('Not cached.'), {code: 'ENOTCACHED'}));
			}
			return result;
		});
};