Using sequelize with AWS Lambda - amazon-web-services

Question

So I'm having some issues trying to use sequelize with AWS Lambda, when querying a table where id = 1 it sometimes returns me data and sometimes it doesn't. I read that Sequelize connections and AWS Lambda service don't get well each other because of the how Lambda executes a function.
My question is, is it not enough to open a connection at the top of a function and then close it at the bottom (before returning something)? If not, what else can I do?
Update:
const findCityByPk = async (pathParameters) => {
const { Postgresql: ps } = require('../libs/utils/potsgresql');
console.log(ps.connection.connectionManager);
const { id } = pathParameters;
try {
const city = await City.findByPk(id);
if (city) {
ps.connection.close();
return {
statusCode: 200,
body: JSON.stringify(city)
};
}
ps.connection.close();
return {
statusCode: 500,
body: JSON.stringify({ message: 'City not found`' })
};
} catch (err) {
console.log(err);
await ps.connection.close();
return {
statusCode: 500,
body: JSON.stringify(err)
};
}
}
This is the code I'm testing it sometimes returns me the correct object from my table
{"id":"1","city_name":"Lima2","zip_code":"12312","time_zone_utc":-5} -> this is what is supposed to be returning, and instead I'm getting this object
{
"requestTime": "06/Dec/2021:18:07:24 +0000",
"requestId": "8b5bf017-c180-41cc-9de6-b07599f0e9b8",
"apiId": "xx",
"resourceId": "xx",
"resourcePath": "/city/{id}",
"path": "/dev/city/1",
"httpMethod": "GET",
"status": "500",
"authLatency": "-",
"integrationLatency": "48",
"integrationStatus": "200",
"responseLatency": "50",
"responseLength": "2",
"errorMessage": "-",
"format": "SLS_ACCESS_LOG",
"version": "1.0.0"
}
And also, this is how it's being made the connection
const createConnection = () => {
console.info("[Postgresql] createConnection: start")
console.info("[Postgresql] createConnection: creating conection start")
let conn;
let string_connection;
try {
string_connection = `postgres://${config.DB_USER}:${config.DB_PASSWORD}#${config.DB_HOST}:5432/${config.DB_NAME}`
//console.debug(`[Postgresql] string_connection: ${string_connection}`)
conn = new Sequelize(string_connection, { logging: false, pool: { max: 1, min: 0, idle: 1000 } });
} catch (e) {
console.debug(`[Postgresql] createConnection: creating conection error ${string_connection}`)
throw e;
}
console.info("[Postgresql] createConnection:creating conection end")
return conn;
}