Able to connect to redis but set/get times out - node.js

Question

I'm trying to do a get() from my AWS Lambda (NodeJS) on ElastiCache Redis using node_redis client. I believe that I'm able to connect to redis but I'm getting Time out (Lambda 60 sec time out) when I'm trying to perform a get() operation.
I have also granted my AWS lambda Administrator access just to be certain that it's not a permissions issue. I'm hitting lambda by going to AWS console and clicking the Test button.
Here is my redisClient.js:
const util = require('util');
const redis = require('redis');
console.info('Start to connect to Redis Server');
const client = redis.createClient({
host: process.env.ElastiCacheEndpoint,
port: process.env.ElastiCachePort
});
client.get = util.promisify(client.get);
client.set = util.promisify(client.set);
client.on('ready',function() {
console.log(" subs Redis is ready"); //Can see this output in logs
});
client.on('connect',function(){
console.log('subs connected to redis'); //Can see this output in logs
})
exports.set = async function(key, value) {
console.log("called set!");
return await client.set(key, value);
}
exports.get = async function(key) {
console.log("called get!"); //Can see this output in logs
return await client.get(key);
}
Here's my index.js which calls the redisClient.js:
const redisclient = require("./redisClient");
exports.handler = async (event) => {
const params = event.params
const operation = event.operation;
try {
console.log("Checking RedisCache by calling client get") // Can see this output in logs
const cachedVal = await redisclient.get('mykey');
console.log("Checked RedisCache by calling client get") // This doesn't show up in logs.
console.log(cachedVal);
if (cachedVal) {
return {
statusCode: 200,
body: JSON.stringify(cachedVal)
}
} else {
const setCache = await redisclient.set('myKey','myVal');
console.log(setCache);
console.log("*******")
let response = await makeCERequest(operation, params, event.account);
console.log("CE Request returned");
return response;
}
}
catch (err) {
return {
statusCode: 500,
body: err,
};
}
}
This is the output (time out error message) that I get:
{
"errorMessage": "2020-07-05T19:04:28.695Z 9951942c-f54a-4b18-9cc2-119eed65e9f1 Task timed out after 60.06 seconds"
}
I have tried using Bluebird (changing get to getAsync()) per this: https://github.com/UtkarshYeolekar/promisify-redis-client/blob/master/redis.js but still got the same behavior.
I also changed the port to use a random value (like 8088) that I'm using to create client (to see the behavior of connect event for a failed connection) - in this case I still see a Timed Out error response but I don't see the subs Redis is ready and subs connected to redis in my logs.
Can anyone please point me in the right direction? I don't seem to understand why I'm able to connect to redis but the get() request times out.

Answer 1

I figured out the issue and posting here in case it helps anyone in future as the behavior wasn't very intuitive for me.
I had enabled AuthToken param while setting up my redis. I was passing the param to lambda with the environment variables but wasn't using it while sending the get()/set() requests. When I disabled the AuthToken requirement from redis configuration - Lambda was able to hit redis with get/set requests. More details on AuthToken can be found here: https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-resource-elasticache-replicationgroup.html#cfn-elasticache-replicationgroup-authtoken