Issues while executing node using redis for data client

Question

While running redis when is try to get data it showing this kind of errors what is wrong with this.

   (node:12362) UnhandledPromiseRejectionWarning: ReferenceError: queueMicrotask is not defined
    at RedisSocket.cork (/home/aathilingam/Desktop/Laravel - Docker/rediscache/node_modules/@node-redis/client/dist/lib/client/socket.js:86:13)
    at Commander._RedisClient_tick (/home/aathilingam/Desktop/Laravel - Docker/rediscache/node_modules/@node-redis/client/dist/lib/client/index.js:410:60)
    at RedisSocket.socket_1.default.on.on.on.on (/home/aathilingam/Desktop/Laravel - Docker/rediscache/node_modules/@node-redis/client/dist/lib/client/index.js:331:86)
    at RedisSocket.emit (events.js:198:13)
    at RedisSocket._RedisSocket_connect (/home/aathilingam/Desktop/Laravel - Docker/rediscache/node_modules/@node-redis/client/dist/lib/client/socket.js:136:10)
    at process._tickCallback (internal/process/next_tick.js:68:7)
(node:12362) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). (rejection id: 1)
(node:12362) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.

My code is for getting details of photos from a site as a json and when i try to load them into redis i got the above error. My code is

const express = require("express");
const axios = require("axios");
const cors = require("cors");
const Redis = require("redis");

//const redisClient = Redis.createClient();
const DEFAULT_EXPIRATION = 3600

const app = express();
app.use(express.urlencoded({ extended: true}));
app.use(cors());


let redisClient;

(async () => {
  redisClient = Redis.createClient();

  redisClient.on('error', (err) => console.log('Redis Client Error', err));

  await redisClient.connect();
  
})();

app.get("/photos",async(req,res) => {
    const albumId = req.query.albumId;
    // redisClient.get(`photos?albumId=${albumId}`,async (error, photos) => {
    //     if(error) console.error(error)
    //     if(photos != null){
    //         console.log("cache hit");
    //         return res.json(JSON.parse(photos))
    //     }else {
            console.log("cache miss");
            const { data } = await axios.get(
                "https://jsonplaceholder.typicode.com/photos",
                { params : { albumId } }
            )
   redisClient.SETEX('photos', DEFAULT_EXPIRATION, JSON.stringify(data));
    //     }
    res.json(data);
})
//})

app.get("/photos/:id",async(req,res) => {
    const { data } = await axios.get(
        `https://jsonplaceholder.typicode.com/photos/${req.params.id}`
        )
    res.json(data);
})

console.log("listening");
app.listen(3000);

if i delete this line its working but can't do nothing without this line. help me with this.

score 1 · Answer 1 · answered Nov 30 '21 at 11:20

1

Looks like you forgot to actually connect your client through client.connect():

So in your case you should add something like:

const Redis = require("redis");

let redisClient;

(async () => {
  redisClient = Redis.createClient();

  redisClient.on('error', (err) => console.log('Redis Client Error', err));

  await redisClient.connect();
  
})();

See the docs for further details: https://github.com/redis/node-redis#basic-example

answered Nov 30 '21 at 11:20

eol

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2

It solves some issues and gives me an another error like this. node:271309) UnhandledPromiseRejectionWarning: TypeError: Cannot read property 'setex' of undefined at app.get (/home/aathilingam/Desktop/Laravel - Docker/rediscache/index.js:38:17) at process._tickCallback (internal/process/next_tick.js:68:7) (node:271309) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). (rejection id: 1) (node:271309) – Nov 30 '21 at 11:54
Please edit your question and add the updated code. – eol Nov 30 '21 at 11:56
Edited please help me with that and thanks – Nov 30 '21 at 12:17
You forgot to call your IIFE-function. Add `();` at the end of it, as I did in my example. – eol Nov 30 '21 at 13:35
It gives reference error updated code and error above – Dec 01 '21 at 04:02

Issues while executing node using redis for data client

1 Answers1