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app.js
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app.js
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const express = require('express');
const bodyParser = require('body-parser');
const config = require('./config');
const db = require('./db');
const Promise = require('bluebird');
const redis = require('redis');
Promise.promisifyAll(redis.RedisClient.prototype);
Promise.promisifyAll(redis.Multi.prototype);
const app = express();
const redisClient = redis.createClient(config.redis);
redisClient.on('error', function (err) {
console.log('Error ' + err);
});
// using ejs as view engine
app.set('view engine', 'ejs');
app.set('views', __dirname + '/views');
// using body parser for parsing POST requests body
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({
extended: true
}));
app.get('/', (req, res) => {
res.render('index');
});
app.post('/', async (req, res) => {
try {
let { name } = req.body;
let result = await redisClient.setAsync(Date.now(), name);
res.json({
success: true
});
}
catch (err) {
res.json({
success: false,
err
});
}
});
app.listen(config.port, () => {
// save data in every minute
setInterval(saveCache, 60000);
console.log(`server listening on ${config.port}`);
});
// save cached user data to database and flush redis
async function saveCache() {
let keys = await redisClient.keysAsync('*');
let keyValuePairs = keys.map(key => new Promise(async (resolve) => {
let value = await redisClient.getAsync(key);
resolve({
name: value,
createdAt: Number(key)
});
}));
let instances = await Promise.all(keyValuePairs);
await db.Name.bulkCreate(instances);
await redisClient.flushdbAsync();
console.log(`Entries are saved and redis is cleared ${instances.length}`);
}