creating a datasource for postgres schema based multitenancy and issues with connection pooling - postgresql

Question

From the typeorm docs:
Generally, you call initialize method of the DataSource instance on application bootstrap, and destroy it after you completely finished working with the database. In practice, if you are building a backend for your site and your backend server always stays running - you never destroy a DataSource.
But, for implementing postgres's schema based multitenancy, I'm scoping connections per request, because, each request has to be sent to a different schema. So, in my getConnection option, I'm doing this:
async function getTenantConnection(
tenantName: string,
connectionOptions?: PostgresConnectionOptions,
) {
if (!connectionOptions) {
connectionOptions = baseConnection;
}
const options: PostgresConnectionOptions = {
...connectionOptions,
schema: tenantName,
entities: [__dirname + '/../**/*.entity.js'],
synchronize: false,
};
const dataSource = new DataSource(options);
return await dataSource.initialize();
}
so on each request, I'm doing getTenantConnection which sort of initialized the database. The previously available getConnection() seems deprecated, and now doing stress tests on the app, I'm getting TCP connection issues, which I simply cannot debug:
5;3m[ExceptionsHandler] connect ETIMEDOUT 20.119.245.111:5432
2023-01-31T10:40:40.581303183Z Error: connect ETIMEDOUT 20.119.245.111:5432
2023-01-31T10:40:40.581370686Z at TCPConnectWrap.afterConnect [as oncomplete] (node:net:1278:16)
2023-01-31T10:40:40.581381886Z at TCPConnectWrap.callbackTrampoline (node:internal/async_hooks:130:17)
2023-01-31T10:40:40.589395960Z [Nest] 53 - 01/31/2023, 10:40:40 AM ERROR [ExceptionsHandler] connect ETIMEDOUT 20.119.245.111:5432
I'm just speculating that the database pool has something to do with this. I don't understand the code fully, but the source code for typeorm doesn't seem to contain any pooling done in the initialize() method section as well. I had tried to take reference from this article which demonstrates schema based multitenancy in postgres using typeorm , but methods available there aren't available anymore so I had to resolve to using .initialize(). Please let me know how I can go about implementing this.