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haimrait/cache.js

Last active Jan 4, 2020
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node-redis-mongo - A first cahce file implementation with hook for every query
const mongoose = require("mongoose");
const redis = require("redis");
const util = require("util");
const keys = require("../config/keys");
const client = redis.createClient({
host: keys.redisHost,
port: keys.redisPort,
retry_strategy: () => 1000
});
client.get = util.promisify(client.get);
const exec = mongoose.Query.prototype.exec;
mongoose.Query.prototype.exec = async function() {
const key = JSON.stringify({
...this.getQuery()
});
const cacheValue = await client.get(key);
if (cacheValue) {
const doc = JSON.parse(cacheValue);
console.log("Response from Redis");
return Array.isArray(doc)
? doc.map(d => new this.model(d))
: new this.model(doc);
}
const result = await exec.apply(this, arguments);
client.set(key, JSON.stringify(result));
console.log("Response from MongoDB");
return result;
};
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